Wed Jul 30 17:52:41 CEST 2003 Paolo Molaro <lupus@ximian.com>

	* Makefile.am, cpu-sparc.md, exceptions-sparc.c, mini-sparc.c,
	mini-sparc.h, tramp-sparc.c: Beginning of sparc support
	from Mark Crichton <crichton@gimp.org> and Christopher Taylor
	(ct@gentoo.org).

svn path=/trunk/mono/; revision=16892

diff --git a/mono/mini/ChangeLog b/mono/mini/ChangeLog
index bc514f0b49ff75d34870afe3655d7675051f6602..380d2709cbd96832b049aed8f0f74b4760c9970b 100644 (file)
--- a/mono/mini/ChangeLog
+++ b/mono/mini/ChangeLog
@@ -1,4 +1,11 @@
 
+Wed Jul 30 17:52:41 CEST 2003 Paolo Molaro <lupus@ximian.com>
+
+       * Makefile.am, cpu-sparc.md, exceptions-sparc.c, mini-sparc.c,
+       mini-sparc.h, tramp-sparc.c: Beginning of sparc support
+       from Mark Crichton <crichton@gimp.org> and Christopher Taylor
+       (ct@gentoo.org).
+
 Tue Jul 29 12:43:08 CEST 2003 Paolo Molaro <lupus@ximian.com>
 
        * mini.c: more opcodes implemented and better support for generics.

diff --git a/mono/mini/Makefile.am b/mono/mini/Makefile.am
index b67c7a98e869824ffef7186844f2bdda163f352e..1adb80964abf15061460645b780dce589f823447 100644 (file)
--- a/mono/mini/Makefile.am
+++ b/mono/mini/Makefile.am
@@ -75,6 +75,12 @@ ppc_sources = \
        exceptions-ppc.c        \
        tramp-ppc.c
 
+sparc_sources = \
+       mini-sparc.c            \
+       mini-sparc.h            \
+       exceptions-sparc.c      \
+       tramp-sparc.c
+
 common_sources = \
        mini.c          \
        mini.h          \
@@ -110,6 +116,15 @@ libmono_la_SOURCES = \
 arch_BURGSRC= $(srcdir)/inssel-ppc.brg
 endif
 
+if SPARC
+libmono_la_SOURCES = \
+       $(common_sources) $(sparc_sources)
+
+#arch_BURGSRC= $(srcdir)/inssel-ppc.brg
+# no inssel for sparc yet
+arch_BURGSRC=
+endif
+
 BURGSRC= $(common_BURGSRC) $(arch_BURGSRC)
 
 libmonoincludedir = $(includedir)/mono/jit
@@ -134,6 +149,9 @@ cpu-pentium.h: cpu-pentium.md genmdesc$(EXEEXT)
 cpu-g4.h: cpu-g4.md genmdesc$(EXEEXT)
        ./genmdesc $(srcdir)/cpu-g4.md cpu-g4.h ppcg4
 
+cpu-sparc.h: cpu-sparc.md genmdesc$(EXEEXT)
+       ./genmdesc $(srcdir)/cpu-sparc.md cpu-sparc.h sparc_desc
+
 inssel.c inssel.h: $(BURGSRC)
        $(monodir)/mono/monoburg/monoburg -c 1 -p -e $(BURGSRC) -d inssel.h -s inssel.c
 
@@ -180,10 +198,10 @@ pkgconfigdir = $(libdir)/pkgconfig
 
 documents=mini-doc.txt mini-porting.txt
 
-BUILT_SOURCES= inssel.c inssel.h cpu-pentium.h cpu-g4.h
+BUILT_SOURCES= inssel.c inssel.h cpu-pentium.h cpu-g4.h cpu-sparc.h
 CLEANFILES= $(BUILT_SOURCES)
 EXTRA_DIST = $(common_BURGSRC) $(documents) inssel-x86.brg inssel-ppc.brg \
        jit-icalls.c cprop.c \
-       cpu-pentium.md cpu-g4.md ldscript
+       cpu-pentium.md cpu-g4.md ldscript cpu-sparc.md
 
 

diff --git a/mono/mini/cpu-sparc.md b/mono/mini/cpu-sparc.md
new file mode 100644 (file)
index 0000000..37a4ce3
--- /dev/null
+++ b/mono/mini/cpu-sparc.md
@@ -0,0 +1,547 @@
+# sparc32 cpu description file
+# this file is read by genmdesc to pruduce a table with all the relevant information
+# about the cpu instructions that may be used by the regsiter allocator, the scheduler
+# and other parts of the arch-dependent part of mini.
+#
+# An opcode name is followed by a colon and optional specifiers.
+# A specifier has a name, a colon and a value. Specifiers are separated by white space.
+# Here is a description of the specifiers valid for this file and their possible values.
+#
+# dest:register       describes the destination register of an instruction
+# src1:register       describes the first source register of an instruction
+# src2:register       describes the second source register of an instruction
+#
+# register may have the following values:
+#      i  integer register
+#      b  base register (used in address references)
+#      f  floating point register
+#
+# len:number         describe the maximun length in bytes of the instruction
+# number is a positive integer
+#
+# cost:number        describe how many cycles are needed to complete the instruction (unused)
+#
+# clob:spec          describe if the instruction clobbers registers or has special needs
+#
+# spec can be one of the following characters:
+#      c  clobbers caller-save registers
+#      r  'reserves' the destination register until a later instruction unreserves it
+#          used mostly to set output registers in function calls
+#
+# flags:spec        describe if the instruction uses or sets the flags (unused)
+#
+# spec can be one of the following chars:
+#      s  sets the flags
+#       u  uses the flags
+#       m  uses and modifies the flags
+#
+# res:spec          describe what units are used in the processor (unused)
+#
+# delay:            describe delay slots (unused)
+#
+# the required specifiers are: len, clob (if registers are clobbered), the registers
+# specifiers if the registers are actually used, flags (when scheduling is implemented).
+#
+# See the code in mini-sparc32.c for more details on how the specifiers are used.
+#
+nop: len:4
+break: len:4
+ldarg.0:
+ldarg.1:
+ldarg.2:
+ldarg.3:
+ldloc.0:
+ldloc.1:
+ldloc.2:
+ldloc.3:
+stloc.0:
+stloc.1:
+stloc.2:
+stloc.3:
+ldarg.s:
+ldarga.s:
+starg.s:
+ldloc.s:
+ldloca.s:
+stloc.s:
+ldnull:
+ldc.i4.m1:
+ldc.i4.0:
+ldc.i4.1:
+ldc.i4.2:
+ldc.i4.3:
+ldc.i4.4:
+ldc.i4.5:
+ldc.i4.6:
+ldc.i4.7:
+ldc.i4.8:
+ldc.i4.s:
+ldc.i4:
+ldc.i8:
+ldc.r4:
+ldc.r8:
+dup:
+pop:
+jmp:
+call: dest:i clob:c len:4
+calli:
+ret:
+br.s:
+brfalse.s:
+brtrue.s:
+beq.s:
+bge.s:
+bgt.s:
+ble.s:
+blt.s:
+bne.un.s:
+bge.un.s:
+bgt.un.s:
+ble.un.s:
+blt.un.s:
+br: len:4
+brfalse:
+brtrue:
+beq: len:4
+bge: len:4
+bgt: len:4
+ble: len:4
+blt: len:4
+bne.un: len:4
+bge.un: len:4
+bgt.un: len:4
+ble.un: len:4
+blt.un: len:4
+switch:
+ldind.i1: dest:i len:4
+ldind.u1: dest:i len:4
+ldind.i2: dest:i len:4
+ldind.u2: dest:i len:4
+ldind.i4: dest:i len:4
+ldind.u4: dest:i len:4
+ldind.i8:
+ldind.i: dest:i len:4
+ldind.r4:
+ldind.r8:
+ldind.ref: dest:i len:4
+stind.ref: src1:b src2:i
+stind.i1: src1:b src2:i
+stind.i2: src1:b src2:i
+stind.i4: src1:b src2:i
+stind.i8:
+stind.r4: src1:b src2:f
+stind.r8: src1:b src2:f
+add: dest:i src1:i src2:i len:4
+sub: dest:i src1:i src2:i len:4
+mul: dest:i src1:i src2:i len:4
+div: dest:i src1:i src2:i len:4
+div.un: dest:i src1:i src2:i len:4
+rem: dest:d src1:i src2:i len:12
+rem.un: dest:d src1:i src2:i len:12
+and: dest:i src1:i src2:i len:4
+or: dest:i src1:i src2:i len:4
+xor: dest:i src1:i src2:i len:4
+shl: dest:i src1:i src2:i len:4
+shr: dest:i src1:i src2:i len:4
+shr.un: dest:i src1:i src2:i len:4
+neg: dest:i src1:i len:4
+not: dest:i src1:i len:4
+conv.i1: dest:i src1:i len:4
+conv.i2: dest:i src1:i len:4
+conv.i4: dest:i src1:i len:4
+conv.i8:
+conv.r4: dest:f src1:i len:4
+conv.r8: dest:f src1:i len:4
+conv.u4: dest:i src1:i len:
+conv.u8:
+callvirt:
+cpobj:
+ldobj:
+ldstr:
+newobj:
+castclass:
+isinst:
+conv.r.un:
+unbox:
+throw: src1:i len:8
+ldfld:
+ldflda:
+stfld:
+ldsfld:
+ldsflda:
+stsfld:
+stobj:
+conv.ovf.i1.un:
+conv.ovf.i2.un:
+conv.ovf.i4.un:
+conv.ovf.i8.un:
+conv.ovf.u1.un:
+conv.ovf.u2.un:
+conv.ovf.u4.un:
+conv.ovf.u8.un:
+conv.ovf.i.un:
+conv.ovf.u.un:
+box:
+newarr:
+ldlen:
+ldelema:
+ldelem.i1:
+ldelem.u1:
+ldelem.i2:
+ldelem.u2:
+ldelem.i4:
+ldelem.u4:
+ldelem.i8:
+ldelem.i:
+ldelem.r4:
+ldelem.r8:
+ldelem.ref:
+stelem.i:
+stelem.i1:
+stelem.i2:
+stelem.i4:
+stelem.i8:
+stelem.r4:
+stelem.r8:
+stelem.ref:
+conv.ovf.i1:
+conv.ovf.u1:
+conv.ovf.i2:
+conv.ovf.u2:
+conv.ovf.i4:
+conv.ovf.u4:
+conv.ovf.i8:
+conv.ovf.u8:
+refanyval:
+ckfinite: dest:f src1:f len:28
+mkrefany:
+ldtoken:
+conv.u2: dest:i src1:i len:4
+conv.u1: dest:i src1:i len:4
+conv.i: dest:i src1:i len:4
+conv.ovf.i:
+conv.ovf.u:
+add.ovf:
+add.ovf.un:
+mul.ovf: dest:i src1:i src2:i len:4
+mul.ovf.un: dest:i src1:i src2:i len:4
+sub.ovf:
+sub.ovf.un:
+# FIXME: May need some work
+endfinally: len:4
+leave:
+leave.s:
+stind.i:
+conv.u: dest:i src1:i len:4
+prefix7:
+prefix6:
+prefix5:
+prefix4:
+prefix3:
+prefix2:
+prefix1:
+prefixref:
+arglist:
+ceq: dest:i len:12
+cgt: dest:i len:12
+cgt.un: dest:i len:12
+clt: dest:i len:12
+clt.un: dest:i len:12
+ldftn:
+ldvirtftn:
+ldarg:
+ldarga:
+starg:
+ldloc:
+ldloca:
+stloc:
+# FIXME: WTF?!?
+localloc: dest:i src1:i len:30
+endfilter:
+unaligned.:
+volatile.:
+tail.:
+initobj:
+cpblk:
+initblk:
+rethrow:
+sizeof:
+refanytype:
+illegal:
+endmac:
+mono_func1:
+mono_proc2:
+mono_proc3:
+mono_free:
+mono_objaddr:
+mono_ldptr:
+mono_vtaddr:
+mono_newobj:
+mono_retobj:
+load:
+ldaddr:
+store:
+phi:
+rename:
+compare: src1:i src2:i len:4
+compare_imm: src1:i len:12
+fcompare: src1:f src2:f len:12
+lcompare:
+local:
+arg:
+# FIXME: Mono-specifc opcodes (OP_)  Need to clean these up
+outarg: src1:i len:1
+outarg_imm: len:5
+retarg:
+setret: dest:a src1:i len:4
+setlret: dest:l src1:i src2:i len:8
+setreg: dest:i src1:i len:4 clob:r
+setregimm: dest:i len:8 clob:r
+setfreg: dest:f src1:f len:4 clob:r
+checkthis: src1:b len:4
+voidcall: len:8 clob:c
+voidcall_reg: src1:i len:8 clob:c
+voidcall_membase: src1:b len:8 clob:c
+fcall: dest:f len:8 clob:c
+fcall_reg: dest:f src1:i len:8 clob:c
+fcall_membase: dest:f src1:b len:8 clob:c
+lcall: dest:l len:8 clob:c
+lcall_reg: dest:l src1:i len:8 clob:c
+lcall_membase: dest:l src1:b len:8 clob:c
+vcall: len:8 clob:c
+vcall_reg: src1:i len:8 clob:c
+vcall_membase: src1:b len:8 clob:c
+call_reg: dest:i src1:i len:8 clob:c
+call_membase: dest:i src1:b len:8 clob:c
+trap:
+iconst: dest:i len:8
+i8const:
+r4const: dest:f len:8
+r8const: dest:f len:8
+regvar:
+reg:
+regoffset:
+label:
+store_membase_imm: dest:b len:12
+store_membase_reg: dest:b src1:i len:8
+storei1_membase_imm: dest:b len:12
+storei1_membase_reg: dest:b src1:i len:8
+storei2_membase_imm: dest:b len:12
+storei2_membase_reg: dest:b src1:i len:8
+storei4_membase_imm: dest:b len:12
+storei4_membase_reg: dest:b src1:i len:8
+storei8_membase_imm: dest:b 
+storei8_membase_reg: dest:b src1:i 
+storer4_membase_reg: dest:b src1:f len:8
+storer8_membase_reg: dest:b src1:f len:8
+load_membase: dest:i src1:b len:12
+loadi1_membase: dest:i src1:b len:12
+loadu1_membase: dest:i src1:b len:12
+loadi2_membase: dest:i src1:b len:12
+loadu2_membase: dest:i src1:b len:12
+loadi4_membase: dest:i src1:b len:12
+loadu4_membase: dest:i src1:b len:12
+loadi8_membase: dest:i src1:b
+loadr4_membase: dest:f src1:b len:8
+loadr8_membase: dest:f src1:b len:12
+loadu4_mem: dest:i len:8
+move: dest:i src1:i len:4
+add_imm: dest:i src1:i len:12
+sub_imm: dest:i src1:i len:12
+mul_imm: dest:i src1:i len:12
+# there is no actual support for division or reminder by immediate
+# we simulate them, though (but we need to change the burg rules 
+# to allocate a symbolic reg for src2)
+div_imm: dest:a src1:i src2:i len:12
+div_un_imm: dest:a src1:i src2:i len:12
+rem_imm: dest:d src1:i src2:i len:16
+rem_un_imm: dest:d src1:i src2:i len:16
+and_imm: dest:i src1:i len:8
+or_imm: dest:i src1:i len:8
+xor_imm: dest:i src1:i len:8
+shl_imm: dest:i src1:i len:8
+shr_imm: dest:i src1:i len:8
+shr_un_imm: dest:i src1:i len:8
+cond_exc_eq: len:8
+cond_exc_ne_un: len:8
+cond_exc_lt: len:8
+cond_exc_lt_un: len:8
+cond_exc_gt: len:8
+cond_exc_gt_un: len:8
+cond_exc_ge: len:8
+cond_exc_ge_un: len:8
+cond_exc_le: len:8
+cond_exc_le_un: len:8
+cond_exc_ov: len:8
+cond_exc_no: len:8
+cond_exc_c: len:8
+cond_exc_nc: len:8
+long_add:
+long_sub:
+long_mul:
+long_div:
+long_div_un:
+long_rem:
+long_rem_un:
+long_and:
+long_or:
+long_xor:
+long_shl:
+long_shr:
+long_shr_un:
+long_neg:
+long_not:
+long_conv_to_i1:
+long_conv_to_i2:
+long_conv_to_i4:
+long_conv_to_i8:
+long_conv_to_r4:
+long_conv_to_r8:
+long_conv_to_u4:
+long_conv_to_u8:
+long_conv_to_u2:
+long_conv_to_u1:
+long_conv_to_i:
+long_conv_to_ovf_i: dest:i src1:i src2:i len:30
+long_conv_to_ovf_u:
+long_add_ovf:
+long_add_ovf_un:
+long_mul_ovf: 
+long_mul_ovf_un:
+long_sub_ovf:
+long_sub_ovf_un:
+long_conv_to_ovf_i1_un:
+long_conv_to_ovf_i2_un:
+long_conv_to_ovf_i4_un:
+long_conv_to_ovf_i8_un:
+long_conv_to_ovf_u1_un:
+long_conv_to_ovf_u2_un:
+long_conv_to_ovf_u4_un:
+long_conv_to_ovf_u8_un:
+long_conv_to_ovf_i_un:
+long_conv_to_ovf_u_un:
+long_conv_to_ovf_i1:
+long_conv_to_ovf_u1:
+long_conv_to_ovf_i2:
+long_conv_to_ovf_u2:
+long_conv_to_ovf_i4:
+long_conv_to_ovf_u4:
+long_conv_to_ovf_i8:
+long_conv_to_ovf_u8:
+long_ceq:
+long_cgt:
+long_cgt_un:
+long_clt:
+long_clt_un:
+long_conv_to_r_un: dest:f src1:i src2:i len:37 
+long_conv_to_u:
+long_shr_imm:
+long_shr_un_imm:
+long_shl_imm:
+long_add_imm:
+long_sub_imm:
+long_beq:
+long_bne_un:
+long_blt:
+long_blt_un:
+long_bgt:
+long_btg_un:
+long_bge:
+long_bge_un:
+long_ble:
+long_ble_un:
+float_beq: len:8
+float_bne_un: len:8
+float_blt: len:8
+float_blt_un: len:8
+float_bgt: len:8
+float_btg_un: len:8
+float_bge: len:8
+float_bge_un: len:8
+float_ble: len:8
+float_ble_un: len:8
+float_add: len:4
+float_sub: len:4
+float_mul: len:4
+float_div: len:4
+float_div_un: len:4
+float_rem: len:16
+float_rem_un: len:16
+float_neg: dest:f src1:f len:4
+float_not: dest:f src1:f len:4
+float_conv_to_i1: dest:i src1:f len:40
+float_conv_to_i2: dest:i src1:f len:40
+float_conv_to_i4: dest:i src1:f len:40
+float_conv_to_i8: dest:l src1:f len:40
+float_conv_to_r4:
+float_conv_to_r8:
+float_conv_to_u4: dest:i src1:f len:40
+float_conv_to_u8: dest:l src1:f len:40
+float_conv_to_u2: dest:i src1:f len:40
+float_conv_to_u1: dest:i src1:f len:40
+float_conv_to_i: dest:i src1:f len:40
+float_conv_to_ovf_i:
+float_conv_to_ovd_u:
+float_add_ovf:
+float_add_ovf_un:
+float_mul_ovf:
+float_mul_ovf_un:
+float_sub_ovf:
+float_sub_ovf_un:
+float_conv_to_ovf_i1_un:
+float_conv_to_ovf_i2_un:
+float_conv_to_ovf_i4_un:
+float_conv_to_ovf_i8_un:
+float_conv_to_ovf_u1_un:
+float_conv_to_ovf_u2_un:
+float_conv_to_ovf_u4_un:
+float_conv_to_ovf_u8_un:
+float_conv_to_ovf_i_un:
+float_conv_to_ovf_u_un:
+float_conv_to_ovf_i1:
+float_conv_to_ovf_u1:
+float_conv_to_ovf_i2:
+float_conv_to_ovf_u2:
+float_conv_to_ovf_i4:
+float_conv_to_ovf_u4:
+float_conv_to_ovf_i8:
+float_conv_to_ovf_u8:
+float_ceq: dest:i src1:f src2:f len:12
+float_cgt: dest:i src1:f src2:f len:12
+float_cgt_un: dest:i src1:f src2:f len:12
+float_clt: dest:i src1:f src2:f len:12
+float_clt_un: dest:i src1:f src2:f len:12
+float_conv_to_u: dest:i src1:f len:36
+call_handler: len:12
+op_endfilter: src1:i len:12
+aot_const: dest:i len:8
+x86_test_null: src1:i len:4
+x86_compare_membase_reg: src1:b src2:i len:8
+x86_compare_membase_imm: src1:b len:8
+x86_compare_reg_membase: src1:i src2:b len:8
+x86_inc_reg: dest:i src1:i clob:1 len:1
+x86_inc_membase: src1:b len:6
+x86_dec_reg: dest:i src1:i clob:1 len:1
+x86_dec_membase: src1:b len:6
+x86_add_membase_imm: src1:b len:8
+x86_sub_membase_imm: src1:b len:8
+x86_push: src1:i len:1
+x86_push_imm: len:5
+x86_push_membase: src1:b len:6
+x86_push_obj: src1:b len:30
+x86_lea: dest:i src1:i src2:i len:7
+x86_xchg: src1:i src2:i clob:x len:1
+x86_fpop: src1:f len:2
+x86_fp_load_i8: dest:f src1:b len:7
+x86_fp_load_i4: dest:f src1:b len:7
+adc: dest:i src1:i src2:i len:4
+addcc: dest:i src1:i src2:i len:4
+subcc: dest:i src1:i src2:i len:4
+adc_imm: dest:i src1:i len:8
+sbb: dest:i src1:i src2:i len:4
+sbb_imm: dest:i src1:i len:8
+br_reg: src1:i len:8
+ppc_subfic: dest:i src1:i len:4
+ppc_subfze: dest:i src1:i len:4
+op_bigmul: len:2 dest:l src1:a src2:i
+op_bigmul_un: len:2 dest:l src1:a src2:i

diff --git a/mono/mini/exceptions-sparc.c b/mono/mini/exceptions-sparc.c
new file mode 100644 (file)
index 0000000..fd94f77
--- /dev/null
+++ b/mono/mini/exceptions-sparc.c
@@ -0,0 +1,193 @@
+/*
+ * exceptionsparc.c: exception support for 64 bit sparc
+ *
+ * Authors:
+ *   Mark Crichton (crichton@gimp.org)
+ *   Dietmar Maurer (dietmar@ximian.com)
+ *
+ * (C) 2003 Ximian, Inc.
+ */
+
+#include <config.h>
+#include <glib.h>
+#include <signal.h>
+#include <string.h>
+
+#include <mono/archh/sparc/sparc-codegen.h>
+#include <mono/metadata/appdomain.h>
+#include <mono/metadata/tabledefs.h>
+#include <mono/metadata/threads.h>
+#include <mono/metadata/debug-helpers.h>
+#include <mono/metadata/exception.h>
+#include <mono/metadata/mono-debug.h>
+
+#include "mini.h"
+#include "mini-sparc.h"
+
+#warning I'm NOT SPARC READY!  MEEP!  MEEP!
+
+gboolean  mono_arch_handle_exception (struct sigcontext *ctx, gpointer obj, gboolean test_only);
+
+typedef struct sigcontext MonoContext;
+
+#define MONO_CONTEXT_SET_IP(ctx,ip) do { (ctx)->SC_EIP = (long)ip; } while (0); 
+#define MONO_CONTEXT_SET_BP(ctx,bp) do { (ctx)->SC_EBP = (long)bp; } while (0); 
+
+#define MONO_CONTEXT_GET_IP(ctx) ((gpointer)((ctx)->SC_EIP))
+#define MONO_CONTEXT_GET_BP(ctx) ((gpointer)((ctx)->SC_EBP))
+
+#ifdef MONO_USE_EXC_TABLES
+
+/*************************************/
+/*    STACK UNWINDING STUFF          */
+/*************************************/
+
+/* These definitions are from unwind-dw2.c in glibc 2.2.5 */
+
+/* For x86 */
+#define DWARF_FRAME_REGISTERS 17
+
+typedef struct frame_state
+{
+  void *cfa;
+  void *eh_ptr;
+  long cfa_offset;
+  long args_size;
+  long reg_or_offset[DWARF_FRAME_REGISTERS+1];
+  unsigned short cfa_reg;
+  unsigned short retaddr_column;
+  char saved[DWARF_FRAME_REGISTERS+1];
+} frame_state;
+
+
+typedef struct frame_state * (*framesf) (void *, struct frame_state *);
+
+static framesf frame_state_for = NULL;
+
+static gboolean inited = FALSE;
+
+typedef char ** (*get_backtrace_symbols_type) (void *__const *__array, int __size);
+
+static get_backtrace_symbols_type get_backtrace_symbols = NULL;
+
+static void
+init_frame_state_for (void)
+{
+       GModule *module;
+
+       /*
+        * There are two versions of __frame_state_for: one in libgcc.a and the
+        * other in glibc.so. We need the version from glibc.
+        * For more info, see this:
+        * http://gcc.gnu.org/ml/gcc/2002-08/msg00192.html
+        */
+       if ((module = g_module_open ("libc.so.6", G_MODULE_BIND_LAZY))) {
+       
+               if (!g_module_symbol (module, "__frame_state_for", (gpointer*)&frame_state_for))
+                       frame_state_for = NULL;
+
+               if (!g_module_symbol (module, "backtrace_symbols", (gpointer*)&get_backtrace_symbols)) {
+                       get_backtrace_symbols = NULL;
+                       frame_state_for = NULL;
+               }
+
+               g_module_close (module);
+       }
+
+       inited = TRUE;
+}
+
+/* mono_arch_has_unwind_info:
+ *
+ * Tests if a function has an DWARF exception table able to restore
+ * all caller saved registers. 
+ */
+gboolean
+mono_arch_has_unwind_info (gconstpointer addr)
+{
+       return FALSE;
+}
+
+struct stack_frame
+{
+  void *next;
+  void *return_address;
+};
+
+gpointer 
+mono_arch_get_throw_exception (void)
+{
+       g_assert (TRUE);
+       return NULL;
+}
+
+/**
+ * arch_get_throw_exception_by_name:
+ *
+ * Returns a function pointer which can be used to raise 
+ * corlib exceptions. The returned function has the following 
+ * signature: void (*func) (char *exc_name); 
+ * For example to raise an arithmetic exception you can use:
+ *
+ * x86_push_imm (code, "ArithmeticException"); 
+ * x86_call_code (code, arch_get_throw_exception_by_name ()); 
+ *
+ */
+gpointer 
+mono_arch_get_throw_exception_by_name (void)
+{
+       g_assert (TRUE);
+       return NULL;
+}      
+
+static MonoArray *
+glist_to_array (GList *list) 
+{
+       MonoDomain *domain = mono_domain_get ();
+       MonoArray *res;
+       int len, i;
+
+       if (!list)
+               return NULL;
+
+       len = g_list_length (list);
+       res = mono_array_new (domain, mono_defaults.int_class, len);
+
+       for (i = 0; list; list = list->next, i++)
+               mono_array_set (res, gpointer, i, list->data);
+
+       return res;
+}
+
+MonoArray *
+ves_icall_get_trace (MonoException *exc, gint32 skip, MonoBoolean need_file_info)
+{
+       return NULL;
+}
+
+void
+mono_jit_walk_stack (MonoStackWalk func, gpointer user_data) {
+}
+
+MonoBoolean
+ves_icall_get_frame_info (gint32 skip, MonoBoolean need_file_info, 
+                         MonoReflectionMethod **method, 
+                         gint32 *iloffset, gint32 *native_offset,
+                         MonoString **file, gint32 *line, gint32 *column)
+{
+       return FALSE;
+}
+
+/**
+ * arch_handle_exception:
+ * @ctx: saved processor state
+ * @obj: the exception object
+ * @test_only: only test if the exception is caught, but dont call handlers
+ *
+ *
+ */
+gboolean
+mono_arch_handle_exception (MonoContext *ctx, gpointer obj, gboolean test_only)
+{
+       g_assert_not_reached ();
+}

diff --git a/mono/mini/mini-sparc.c b/mono/mini/mini-sparc.c
new file mode 100644 (file)
index 0000000..e28f2ed
--- /dev/null
+++ b/mono/mini/mini-sparc.c
@@ -0,0 +1,2913 @@
+/*
+ * mini-ppc.c: PowerPC backend for the Mono code generator
+ *
+ * Authors:
+ *   Paolo Molaro (lupus@ximian.com)
+ *   Dietmar Maurer (dietmar@ximian.com)
+ *
+ * Modified for SPARC:
+ *   Christopher Taylor (ct@gentoo.org)
+ *
+ * (C) 2003 Ximian, Inc.
+ */
+#include "mini.h"
+#include <string.h>
+
+#include <mono/metadata/appdomain.h>
+#include <mono/metadata/debug-helpers.h>
+
+#include "mini-ppc.h"
+#include "inssel.h"
+#include "cpu-g4.h"
+
+int mono_exc_esp_offset = 0;
+
+const char*
+mono_arch_regname (int reg) {
+       static const char * rnames[] = {
+               "sparc_r0", "sparc_sp", "sparc_r2", "sparc_r3", "sparc_r4",
+               "sparc_r5", "sparc_r6", "sparc_r7", "sparc_r8", "sparc_r9",
+               "sparc_r10", "sparc_r11", "sparc_r12", "sparc_r13", "sparc_r14",
+               "sparc_r15", "sparc_r16", "sparc_r17", "sparc_r18", "sparc_r19",
+               "sparc_r20", "sparc_r21", "sparc_r22", "sparc_r23", "sparc_r24",
+               "sparc_r25", "sparc_r26", "sparc_r27", "sparc_r28", "sparc_r29",
+               "sparc_r30", "sparc_r31"
+       };
+       if (reg >= 0 && reg < 32)
+               return rnames [reg];
+       return "unknown";
+}
+
+typedef struct {
+       guint16 size;
+       guint16 offset;
+       guint8  pad;
+} MonoJitArgumentInfo;
+
+/*
+ * arch_get_argument_info:
+ * @csig:  a method signature
+ * @param_count: the number of parameters to consider
+ * @arg_info: an array to store the result infos
+ *
+ * Gathers information on parameters such as size, alignment and
+ * padding. arg_info should be large enought to hold param_count + 1 entries. 
+ *
+ * Returns the size of the activation frame.
+ */
+static int
+arch_get_argument_info (MonoMethodSignature *csig, int param_count, MonoJitArgumentInfo *arg_info)
+{
+       int k, frame_size = 0;
+       int size, align, pad;
+       int offset = 8;
+
+       if (MONO_TYPE_ISSTRUCT (csig->ret)) { 
+               frame_size += sizeof (gpointer);
+               offset += 4;
+       }
+
+       arg_info [0].offset = offset;
+
+       if (csig->hasthis) {
+               frame_size += sizeof (gpointer);
+               offset += 4;
+       }
+
+       arg_info [0].size = frame_size;
+
+       for (k = 0; k < param_count; k++) {
+               
+               if (csig->pinvoke)
+                       size = mono_type_native_stack_size (csig->params [k], &align);
+               else
+                       size = mono_type_stack_size (csig->params [k], &align);
+
+               /* ignore alignment for now */
+               align = 1;
+
+               frame_size += pad = (align - (frame_size & (align - 1))) & (align - 1); 
+               arg_info [k].pad = pad;
+               frame_size += size;
+               arg_info [k + 1].pad = 0;
+               arg_info [k + 1].size = size;
+               offset += pad;
+               arg_info [k + 1].offset = offset;
+               offset += size;
+       }
+
+       align = MONO_ARCH_FRAME_ALIGNMENT;
+       frame_size += pad = (align - (frame_size & (align - 1))) & (align - 1);
+       arg_info [k].pad = pad;
+
+       return frame_size;
+}
+
+static int indent_level = 0;
+
+static void indent (int diff) {
+       int v = indent_level;
+       while (v-- > 0) {
+               printf (". ");
+       }
+       indent_level += diff;
+}
+
+static void
+enter_method (MonoMethod *method, char *ebp)
+{
+       int i, j;
+       MonoClass *class;
+       MonoObject *o;
+       MonoJitArgumentInfo *arg_info;
+       MonoMethodSignature *sig;
+       char *fname;
+
+       fname = mono_method_full_name (method, TRUE);
+       indent (1);
+       printf ("ENTER: %s(", fname);
+       g_free (fname);
+       
+       if (((int)ebp & (MONO_ARCH_FRAME_ALIGNMENT - 1)) != 0) {
+               g_error ("unaligned stack detected (%p)", ebp);
+       }
+
+       sig = method->signature;
+
+       arg_info = alloca (sizeof (MonoJitArgumentInfo) * (sig->param_count + 1));
+
+       arch_get_argument_info (sig, sig->param_count, arg_info);
+
+       if (MONO_TYPE_ISSTRUCT (method->signature->ret)) {
+               g_assert (!method->signature->ret->byref);
+
+               printf ("VALUERET:%p, ", *((gpointer *)(ebp + 8)));
+       }
+
+       if (method->signature->hasthis) {
+               gpointer *this = (gpointer *)(ebp + arg_info [0].offset);
+               if (method->klass->valuetype) {
+                       printf ("value:%p, ", *this);
+               } else {
+                       o = *((MonoObject **)this);
+
+                       if (o) {
+                               class = o->vtable->klass;
+
+                               if (class == mono_defaults.string_class) {
+                                       printf ("this:[STRING:%p:%s], ", o, mono_string_to_utf8 ((MonoString *)o));
+                               } else {
+                                       printf ("this:%p[%s.%s], ", o, class->name_space, class->name);
+                               }
+                       } else 
+                               printf ("this:NULL, ");
+               }
+       }
+
+       for (i = 0; i < method->signature->param_count; ++i) {
+               gpointer *cpos = (gpointer *)(ebp + arg_info [i + 1].offset);
+               int size = arg_info [i + 1].size;
+
+               MonoType *type = method->signature->params [i];
+               
+               if (type->byref) {
+                       printf ("[BYREF:%p], ", *cpos); 
+               } else switch (type->type) {
+                       
+               case MONO_TYPE_I:
+               case MONO_TYPE_U:
+                       printf ("%p, ", (gpointer)*((int *)(cpos)));
+                       break;
+               case MONO_TYPE_BOOLEAN:
+               case MONO_TYPE_CHAR:
+               case MONO_TYPE_I1:
+               case MONO_TYPE_U1:
+               case MONO_TYPE_I2:
+               case MONO_TYPE_U2:
+               case MONO_TYPE_I4:
+               case MONO_TYPE_U4:
+                       printf ("%d, ", *((int *)(cpos)));
+                       break;
+               case MONO_TYPE_STRING: {
+                       MonoString *s = *((MonoString **)cpos);
+                       if (s) {
+                               g_assert (((MonoObject *)s)->vtable->klass == mono_defaults.string_class);
+                               printf ("[STRING:%p:%s], ", s, mono_string_to_utf8 (s));
+                       } else 
+                               printf ("[STRING:null], ");
+                       break;
+               }
+               case MONO_TYPE_CLASS:
+               case MONO_TYPE_OBJECT: {
+                       o = *((MonoObject **)cpos);
+                       if (o) {
+                               class = o->vtable->klass;
+                   
+                               if (class == mono_defaults.string_class) {
+                                       printf ("[STRING:%p:%s], ", o, mono_string_to_utf8 ((MonoString *)o));
+                               } else if (class == mono_defaults.int32_class) {
+                                       printf ("[INT32:%p:%d], ", o, *(gint32 *)((char *)o + sizeof (MonoObject)));
+                               } else
+                                       printf ("[%s.%s:%p], ", class->name_space, class->name, o);
+                       } else {
+                               printf ("%p, ", *((gpointer *)(cpos)));                         
+                       }
+                       break;
+               }
+               case MONO_TYPE_PTR:
+               case MONO_TYPE_FNPTR:
+               case MONO_TYPE_ARRAY:
+               case MONO_TYPE_SZARRAY:
+                       printf ("%p, ", *((gpointer *)(cpos)));
+                       break;
+               case MONO_TYPE_I8:
+                       printf ("%lld, ", *((gint64 *)(cpos)));
+                       break;
+               case MONO_TYPE_R4:
+                       printf ("%f, ", *((float *)(cpos)));
+                       break;
+               case MONO_TYPE_R8:
+                       printf ("%f, ", *((double *)(cpos)));
+                       break;
+               case MONO_TYPE_VALUETYPE: 
+                       printf ("[");
+                       for (j = 0; j < size; j++)
+                               printf ("%02x,", *((guint8*)cpos +j));
+                       printf ("], ");
+                       break;
+               default:
+                       printf ("XX, ");
+               }
+       }
+
+       printf (")\n");
+}
+
+static void
+leave_method (MonoMethod *method, ...)
+{
+       MonoType *type;
+       char *fname;
+       va_list ap;
+
+       va_start(ap, method);
+
+       fname = mono_method_full_name (method, TRUE);
+       indent (-1);
+       printf ("LEAVE: %s", fname);
+       g_free (fname);
+
+       type = method->signature->ret;
+
+handle_enum:
+       switch (type->type) {
+       case MONO_TYPE_VOID:
+               break;
+       case MONO_TYPE_BOOLEAN: {
+               int eax = va_arg (ap, int);
+               if (eax)
+                       printf ("TRUE:%d", eax);
+               else 
+                       printf ("FALSE");
+                       
+               break;
+       }
+       case MONO_TYPE_CHAR:
+       case MONO_TYPE_I1:
+       case MONO_TYPE_U1:
+       case MONO_TYPE_I2:
+       case MONO_TYPE_U2:
+       case MONO_TYPE_I4:
+       case MONO_TYPE_U4:
+       case MONO_TYPE_I:
+       case MONO_TYPE_U: {
+               int eax = va_arg (ap, int);
+               printf ("EAX=%d", eax);
+               break;
+       }
+       case MONO_TYPE_STRING: {
+               MonoString *s = va_arg (ap, MonoString *);
+;
+               if (s) {
+                       g_assert (((MonoObject *)s)->vtable->klass == mono_defaults.string_class);
+                       printf ("[STRING:%p:%s]", s, mono_string_to_utf8 (s));
+               } else 
+                       printf ("[STRING:null], ");
+               break;
+       }
+       case MONO_TYPE_CLASS: 
+       case MONO_TYPE_OBJECT: {
+               MonoObject *o = va_arg (ap, MonoObject *);
+
+               if (o) {
+                       if (o->vtable->klass == mono_defaults.boolean_class) {
+                               printf ("[BOOLEAN:%p:%d]", o, *((guint8 *)o + sizeof (MonoObject)));            
+                       } else if  (o->vtable->klass == mono_defaults.int32_class) {
+                               printf ("[INT32:%p:%d]", o, *((gint32 *)((char *)o + sizeof (MonoObject))));    
+                       } else if  (o->vtable->klass == mono_defaults.int64_class) {
+                               printf ("[INT64:%p:%lld]", o, *((gint64 *)((char *)o + sizeof (MonoObject))));  
+                       } else
+                               printf ("[%s.%s:%p]", o->vtable->klass->name_space, o->vtable->klass->name, o);
+               } else
+                       printf ("[OBJECT:%p]", o);
+              
+               break;
+       }
+       case MONO_TYPE_PTR:
+       case MONO_TYPE_FNPTR:
+       case MONO_TYPE_ARRAY:
+       case MONO_TYPE_SZARRAY: {
+               gpointer p = va_arg (ap, gpointer);
+               printf ("result=%p", p);
+               break;
+       }
+       case MONO_TYPE_I8: {
+               gint64 l =  va_arg (ap, gint64);
+               printf ("lresult=%lld", l);
+               break;
+       }
+       case MONO_TYPE_R8: {
+               double f = va_arg (ap, double);
+               printf ("FP=%f\n", f);
+               break;
+       }
+       case MONO_TYPE_VALUETYPE: 
+               if (type->data.klass->enumtype) {
+                       type = type->data.klass->enum_basetype;
+                       goto handle_enum;
+               } else {
+                       guint8 *p = va_arg (ap, gpointer);
+                       int j, size, align;
+                       size = mono_type_size (type, &align);
+                       printf ("[");
+                       for (j = 0; p && j < size; j++)
+                               printf ("%02x,", p [j]);
+                       printf ("]");
+               }
+               break;
+       default:
+               printf ("(unknown return type %x)", method->signature->ret->type);
+       }
+
+       printf ("\n");
+}
+
+/*
+ * Initialize the cpu to execute managed code.
+ */
+void
+mono_arch_cpu_init (void)
+{
+}
+
+/*
+ * This function returns the optimizations supported on this cpu.
+ */
+guint32
+mono_arch_cpu_optimizazions (guint32 *exclude_mask)
+{
+       guint32 opts = 0;
+
+       /* no ppc-specific optimizations yet */
+       *exclude_mask = 0;
+       return opts;
+}
+
+static gboolean
+is_regsize_var (MonoType *t) {
+       if (t->byref)
+               return TRUE;
+       switch (t->type) {
+       case MONO_TYPE_I4:
+       case MONO_TYPE_U4:
+       case MONO_TYPE_I:
+       case MONO_TYPE_U:
+               return TRUE;
+       case MONO_TYPE_OBJECT:
+       case MONO_TYPE_STRING:
+       case MONO_TYPE_CLASS:
+       case MONO_TYPE_SZARRAY:
+       case MONO_TYPE_ARRAY:
+               return FALSE;
+       case MONO_TYPE_VALUETYPE:
+               if (t->data.klass->enumtype)
+                       return is_regsize_var (t->data.klass->enum_basetype);
+               return FALSE;
+       }
+       return FALSE;
+}
+
+GList *
+mono_arch_get_allocatable_int_vars (MonoCompile *cfg)
+{
+       GList *vars = NULL;
+       int i;
+
+       for (i = 0; i < cfg->num_varinfo; i++) {
+               MonoInst *ins = cfg->varinfo [i];
+               MonoMethodVar *vmv = MONO_VARINFO (cfg, i);
+
+               /* unused vars */
+               if (vmv->range.first_use.abs_pos > vmv->range.last_use.abs_pos)
+                       continue;
+
+               if (ins->flags & (MONO_INST_VOLATILE|MONO_INST_INDIRECT) || (ins->opcode != OP_LOCAL && ins->opcode != OP_ARG))
+                       continue;
+
+               /* we can only allocate 32 bit values */
+               if (is_regsize_var (ins->inst_vtype)) {
+                       g_assert (MONO_VARINFO (cfg, i)->reg == -1);
+                       g_assert (i == vmv->idx);
+                       vars = mono_varlist_insert_sorted (cfg, vars, vmv, FALSE);
+               }
+       }
+
+       return vars;
+}
+
+GList *
+mono_arch_get_global_int_regs (MonoCompile *cfg)
+{
+       GList *regs = NULL;
+       int i, top = 32;
+       if (cfg->flags & MONO_CFG_HAS_ALLOCA)
+               top = 31;
+       for (i = 13; i < top; ++i)
+               regs = g_list_prepend (regs, GUINT_TO_POINTER (i));
+
+       return regs;
+}
+
+// code from ppc/tramp.c, try to keep in sync
+#define MIN_CACHE_LINE 8
+
+void
+mono_arch_flush_icache (guint8 *code, gint size)
+{
+       guint i;
+       guint8 *p;
+
+       p = code;
+       for (i = 0; i < size; i += MIN_CACHE_LINE, p += MIN_CACHE_LINE) {
+               asm ("dcbst 0,%0;" : : "r"(p) : "memory");
+       }
+       asm ("sync");
+       p = code;
+       for (i = 0; i < size; i += MIN_CACHE_LINE, p += MIN_CACHE_LINE) {
+               asm ("icbi 0,%0; sync;" : : "r"(p) : "memory");
+       }
+       asm ("sync");
+       asm ("isync");
+}
+
+#define NOT_IMPLEMENTED(x) \
+                g_error ("FIXME: %s is not yet implemented. (trampoline)", x);
+
+#define PROLOG_INS 8
+#define CALL_INS   2
+#define EPILOG_INS 6
+#define FLOAT_REGS 8
+#define GENERAL_REGS 8
+#ifdef __APPLE__
+#define MINIMAL_STACK_SIZE 10
+#define ALWAYS_ON_STACK(s) s
+#define FP_ALSO_IN_REG(s) s
+#define RET_ADDR_OFFSET 8
+#define STACK_PARAM_OFFSET 24
+#else
+#define MINIMAL_STACK_SIZE 5
+#define ALWAYS_ON_STACK(s)
+#define FP_ALSO_IN_REG(s) s
+#define ALIGN_DOUBLES
+#define RET_ADDR_OFFSET 4
+#define STACK_PARAM_OFFSET 8
+#endif
+
+typedef struct {
+       gint16 offset;
+       gint8  reg;
+       gint8  regtype; /* 0 general, 1 basereg, 2 floating point register */
+} ArgInfo;
+
+typedef struct {
+       int nargs;
+       guint32 stack_usage;
+       ArgInfo ret;
+       ArgInfo args [1];
+} CallInfo;
+
+#define DEBUG(a)
+
+static void inline
+add_general (guint *gr, guint *stack_size, ArgInfo *ainfo, gboolean simple)
+{
+       if (simple) {
+               if (*gr >= 3 + GENERAL_REGS) {
+                       ainfo->offset = *stack_size;
+                       ainfo->reg = ppc_sp; /* in the caller */
+                       ainfo->regtype = 1;
+                       *stack_size += 4;
+               } else {
+                       ALWAYS_ON_STACK (*stack_size += 4);
+                       ainfo->reg = *gr;
+               }
+       } else {
+               if (*gr >= 3 + GENERAL_REGS - 1) {
+                       ainfo->offset = *stack_size;
+                       ainfo->reg = ppc_sp; /* in the caller */
+                       ainfo->regtype = 1;
+                       *stack_size += 8;
+#ifdef ALIGN_DOUBLES
+                       *stack_size += (*stack_size % 8);
+#endif
+               } else {
+                       ALWAYS_ON_STACK (*stack_size += 8);
+                       ainfo->reg = *gr;
+               }
+#ifdef ALIGN_DOUBLES
+               if ((*gr) & 1)
+                       (*gr) ++;
+#endif
+               (*gr) ++;
+       }
+       (*gr) ++;
+}
+
+static CallInfo*
+calculate_sizes (MonoMethodSignature *sig, gboolean is_pinvoke)
+{
+       guint i, fr, gr;
+       int n = sig->hasthis + sig->param_count;
+       guint32 simpletype;
+       guint32 stack_size = 0;
+       CallInfo *cinfo = g_malloc0 (sizeof (CallInfo) + sizeof (ArgInfo) * n);
+
+       fr = 1;
+       gr = 3;
+
+       /* FIXME: handle returning a struct */
+
+       n = 0;
+       if (sig->hasthis) {
+               add_general (&gr, &stack_size, cinfo->args + n, TRUE);
+               n++;
+       }
+        DEBUG(printf("params: %d\n", sig->param_count));
+       for (i = 0; i < sig->param_count; ++i) {
+                DEBUG(printf("param %d: ", i));
+               if (sig->params [i]->byref) {
+                        DEBUG(printf("byref\n"));
+                       add_general (&gr, &stack_size, cinfo->args + n, TRUE);
+                       n++;
+                       continue;
+               }
+               simpletype = sig->params [i]->type;
+       enum_calc_size:
+               switch (simpletype) {
+               case MONO_TYPE_BOOLEAN:
+               case MONO_TYPE_CHAR:
+               case MONO_TYPE_I1:
+               case MONO_TYPE_U1:
+               case MONO_TYPE_I2:
+               case MONO_TYPE_U2:
+               case MONO_TYPE_I4:
+               case MONO_TYPE_U4:
+               case MONO_TYPE_I:
+               case MONO_TYPE_U:
+               case MONO_TYPE_PTR:
+               case MONO_TYPE_CLASS:
+               case MONO_TYPE_OBJECT:
+               case MONO_TYPE_STRING:
+               case MONO_TYPE_SZARRAY:
+               case MONO_TYPE_ARRAY:
+                       add_general (&gr, &stack_size, cinfo->args + n, TRUE);
+                       n++;
+                       break;
+               case MONO_TYPE_VALUETYPE: {
+                       gint size;
+                       if (sig->params [i]->data.klass->enumtype) {
+                               simpletype = sig->params [i]->data.klass->enum_basetype->type;
+                               goto enum_calc_size;
+                       }
+#if 0
+                       size = mono_class_value_size (sig->params [i]->data.klass, NULL);
+                       if (size != 4) {
+                               DEBUG(printf ("copy %d bytes struct on stack\n",
+                                             mono_class_value_size (sig->params [i]->data.klass, NULL)));
+                               *stack_size += (size + 3) & (~3);
+                               if (gr > 3 + GENERAL_REGS) {
+                                       *stack_size += 4;
+                               }
+                       } else {
+                               DEBUG(printf ("load %d bytes struct\n",
+                                             mono_class_value_size (sig->params [i]->data.klass, NULL)));
+                               add_general (&gr, stack_size, code_size, TRUE);
+                       }
+#endif
+                       g_assert_not_reached ();
+                       break;
+               }
+               case MONO_TYPE_U8:
+               case MONO_TYPE_I8:
+                       add_general (&gr, &stack_size, cinfo->args + n, FALSE);
+                       n++;
+                       break;
+               case MONO_TYPE_R4:
+                       if (fr < 7) {
+                               fr ++;
+                               FP_ALSO_IN_REG (gr ++);
+                               ALWAYS_ON_STACK (stack_size += 4);
+                       } else {
+                               NOT_IMPLEMENTED ("R4 arg");
+                       }
+                       n++;
+                       break;
+               case MONO_TYPE_R8:
+                       if (fr < 7) {
+                               fr ++;
+                               FP_ALSO_IN_REG (gr += 2);
+                               ALWAYS_ON_STACK (stack_size += 8);
+                       } else {
+                               NOT_IMPLEMENTED ("R8 arg");
+                       }
+                       n++;
+                       break;
+               default:
+                       g_error ("Can't trampoline 0x%x", sig->params [i]->type);
+               }
+       }
+
+       {
+               simpletype = sig->ret->type;
+enum_retvalue:
+               switch (simpletype) {
+               case MONO_TYPE_BOOLEAN:
+               case MONO_TYPE_I1:
+               case MONO_TYPE_U1:
+               case MONO_TYPE_I2:
+               case MONO_TYPE_U2:
+               case MONO_TYPE_CHAR:
+               case MONO_TYPE_I4:
+               case MONO_TYPE_U4:
+               case MONO_TYPE_I:
+               case MONO_TYPE_U:
+               case MONO_TYPE_CLASS:
+               case MONO_TYPE_OBJECT:
+               case MONO_TYPE_SZARRAY:
+               case MONO_TYPE_ARRAY:
+               case MONO_TYPE_STRING:
+                       cinfo->ret.reg = ppc_r3;
+                       break;
+               case MONO_TYPE_U8:
+               case MONO_TYPE_I8:
+                       cinfo->ret.reg = ppc_r3;
+                       break;
+               case MONO_TYPE_R4:
+               case MONO_TYPE_R8:
+                       cinfo->ret.reg = ppc_f1;
+                       cinfo->ret.regtype = 2;
+                       break;
+               case MONO_TYPE_VALUETYPE:
+                       if (sig->ret->data.klass->enumtype) {
+                               simpletype = sig->ret->data.klass->enum_basetype->type;
+                               goto enum_retvalue;
+                       }
+                       break;
+               case MONO_TYPE_VOID:
+                       break;
+               default:
+                       g_error ("Can't handle as return value 0x%x", sig->ret->type);
+               }
+       }
+
+       /* align stack size to 16 */
+       DEBUG (printf ("      stack size: %d (%d)\n", (stack_size + 15) & ~15, stack_size));
+       stack_size = (stack_size + 15) & ~15;
+
+       cinfo->stack_usage = stack_size;
+       return cinfo;
+}
+
+
+/*
+ * Set var information according to the calling convention. ppc version.
+ * The locals var stuff should most likely be split in another method.
+ */
+void
+mono_arch_allocate_vars (MonoCompile *m)
+{
+       MonoMethodSignature *sig;
+       MonoMethodHeader *header;
+       MonoInst *inst;
+       int i, offset, size, align, curinst;
+       int frame_reg = ppc_sp;
+ 
+       if (m->flags & MONO_CFG_HAS_ALLOCA)
+               frame_reg = ppc_r31;
+       m->frame_reg = frame_reg;
+
+       header = ((MonoMethodNormal *)m->method)->header;
+
+       sig = m->method->signature;
+       
+       offset = 0;
+       curinst = 0;
+       if (MONO_TYPE_ISSTRUCT (sig->ret)) {
+               m->ret->opcode = OP_REGVAR;
+               m->ret->inst_c0 = ppc_r3;
+       } else {
+               /* FIXME: handle long and FP values */
+               switch (sig->ret->type) {
+               case MONO_TYPE_VOID:
+                       break;
+               default:
+                       m->ret->opcode = OP_REGVAR;
+                       m->ret->inst_c0 = ppc_r3;
+                       break;
+               }
+       }
+       /* local vars are at a positive offset from the stack pointer */
+       /* 
+        * also note that if the function uses alloca, we use ppc_r31
+        * to point at the local variables.
+        */
+       offset = 24; /* linkage area */
+       /* align the offset to 16 bytes: not sure this is needed here  */
+       //offset += 16 - 1;
+       //offset &= ~(16 - 1);
+
+       /* add parameter area size for called functions */
+       offset += m->param_area;
+       offset += 16 - 1;
+       offset &= ~(16 - 1);
+
+       /* FIXME: check how to handle this stuff... reserve space to save LMF and caller saved registers */
+       offset += sizeof (MonoLMF);
+
+#if 0
+       /* this stuff should not be needed on ppc and the new jit,
+        * because a call on ppc to the handlers doesn't change the 
+        * stack pointer and the jist doesn't manipulate the stack pointer
+        * for operations involving valuetypes.
+        */
+       /* reserve space to store the esp */
+       offset += sizeof (gpointer);
+
+       /* this is a global constant */
+       mono_exc_esp_offset = offset;
+#endif
+
+       curinst = m->locals_start;
+       for (i = curinst; i < m->num_varinfo; ++i) {
+               inst = m->varinfo [i];
+               if (inst->opcode == OP_REGVAR)
+                       continue;
+
+               /* inst->unused indicates native sized value types, this is used by the
+               * pinvoke wrappers when they call functions returning structure */
+               if (inst->unused && MONO_TYPE_ISSTRUCT (inst->inst_vtype))
+                       size = mono_class_native_size (inst->inst_vtype->data.klass, &align);
+               else
+                       size = mono_type_size (inst->inst_vtype, &align);
+
+               offset += align - 1;
+               offset &= ~(align - 1);
+               inst->inst_offset = offset;
+               inst->opcode = OP_REGOFFSET;
+               inst->inst_basereg = frame_reg;
+               offset += size;
+               //g_print ("allocating local %d to %d\n", i, inst->inst_offset);
+       }
+
+       curinst = 0;
+       if (sig->hasthis) {
+               inst = m->varinfo [curinst];
+               if (inst->opcode != OP_REGVAR) {
+                       inst->opcode = OP_REGOFFSET;
+                       inst->inst_basereg = frame_reg;
+                       offset += sizeof (gpointer) - 1;
+                       offset &= ~(sizeof (gpointer) - 1);
+                       inst->inst_offset = offset;
+                       offset += sizeof (gpointer);
+               }
+               curinst++;
+       }
+
+       for (i = 0; i < sig->param_count; ++i) {
+               inst = m->varinfo [curinst];
+               if (inst->opcode != OP_REGVAR) {
+                       inst->opcode = OP_REGOFFSET;
+                       inst->inst_basereg = frame_reg;
+                       size = mono_type_size (sig->params [i], &align);
+                       offset += align - 1;
+                       offset &= ~(align - 1);
+                       inst->inst_offset = offset;
+                       offset += size;
+               }
+               curinst++;
+       }
+
+       /* align the offset to 16 bytes */
+       offset += 16 - 1;
+       offset &= ~(16 - 1);
+
+       /* change sign? */
+       m->stack_offset = offset;
+
+}
+
+/* Fixme: we need an alignment solution for enter_method and mono_arch_call_opcode,
+ * currently alignment in mono_arch_call_opcode is computed without arch_get_argument_info 
+ */
+
+/* 
+ * take the arguments and generate the arch-specific
+ * instructions to properly call the function in call.
+ * This includes pushing, moving arguments to the right register
+ * etc.
+ * Issue: who does the spilling if needed, and when?
+ */
+MonoCallInst*
+mono_arch_call_opcode (MonoCompile *cfg, MonoBasicBlock* bb, MonoCallInst *call, int is_virtual) {
+       MonoInst *arg, *in;
+       MonoMethodSignature *sig;
+       int i, n, type;
+       MonoType *ptype;
+       CallInfo *cinfo;
+       ArgInfo *ainfo;
+
+       sig = call->signature;
+       n = sig->param_count + sig->hasthis;
+       
+       cinfo = calculate_sizes (sig, sig->pinvoke);
+
+       for (i = 0; i < n; ++i) {
+               ainfo = cinfo->args + i;
+               if (is_virtual && i == 0) {
+                       /* the argument will be attached to the call instrucion */
+                       in = call->args [i];
+               } else {
+                       MONO_INST_NEW (cfg, arg, OP_OUTARG);
+                       in = call->args [i];
+                       arg->cil_code = in->cil_code;
+                       arg->inst_left = in;
+                       arg->type = in->type;
+                       /* prepend, we'll need to reverse them later */
+                       arg->next = call->out_args;
+                       call->out_args = arg;
+                       if (ainfo->regtype == 0) {
+                               arg->unused = ainfo->reg;
+                               call->used_iregs |= 1 << ainfo->reg;
+                       } else if (ainfo->regtype == 1) {
+                               g_assert_not_reached ();
+                       } else if (ainfo->regtype == 2) {
+                               arg->opcode = OP_OUTARG_R8;
+                               arg->unused = ainfo->reg;
+                               call->used_fregs |= 1 << ainfo->reg;
+                       } else {
+                               g_assert_not_reached ();
+                       }
+               }
+       }
+       /*
+        * Reverse the call->out_args list.
+        */
+       {
+               MonoInst *prev = NULL, *list = call->out_args, *next;
+               while (list) {
+                       next = list->next;
+                       list->next = prev;
+                       prev = list;
+                       list = next;
+               }
+       }
+       call->stack_usage = cinfo->stack_usage;
+       cfg->param_area = MAX (cfg->param_area, cinfo->stack_usage);
+       cfg->flags |= MONO_CFG_HAS_CALLS;
+       /* 
+        * should set more info in call, such as the stack space
+        * used by the args that needs to be added back to esp
+        */
+
+       g_free (cinfo);
+       return call;
+}
+
+/*
+ * Allow tracing to work with this interface (with an optional argument)
+ */
+
+/*
+ * This may be needed on some archs or for debugging support.
+ */
+void
+mono_arch_instrument_mem_needs (MonoMethod *method, int *stack, int *code)
+{
+       /* no stack room needed now (may be needed for FASTCALL-trace support) */
+       *stack = 0;
+       /* split prolog-epilog requirements? */
+       *code = 50; /* max bytes needed: check this number */
+}
+
+void*
+mono_arch_instrument_prolog (MonoCompile *cfg, void *func, void *p, gboolean enable_arguments)
+{
+       guchar *code = p;
+#if 0
+       /* if some args are passed in registers, we need to save them here */
+       x86_push_reg (code, X86_EBP);
+       x86_push_imm (code, cfg->method);
+       mono_add_patch_info (cfg, code-cfg->native_code, MONO_PATCH_INFO_ABS, func);
+       x86_call_code (code, 0);
+       x86_alu_reg_imm (code, X86_ADD, X86_ESP, 8);
+#endif
+       return code;
+}
+
+enum {
+       SAVE_NONE,
+       SAVE_STRUCT,
+       SAVE_ONE,
+       SAVE_TWO,
+       SAVE_FP
+};
+
+void*
+mono_arch_instrument_epilog (MonoCompile *cfg, void *func, void *p, gboolean enable_arguments)
+{
+       guchar *code = p;
+       int arg_size = 0, save_mode = SAVE_NONE;
+       MonoMethod *method = cfg->method;
+       int rtype = method->signature->ret->type;
+       
+handle_enum:
+       switch (rtype) {
+       case MONO_TYPE_VOID:
+               /* special case string .ctor icall */
+               if (strcmp (".ctor", method->name) && method->klass == mono_defaults.string_class)
+                       save_mode = SAVE_ONE;
+               else
+                       save_mode = SAVE_NONE;
+               break;
+       case MONO_TYPE_I8:
+       case MONO_TYPE_U8:
+               save_mode = SAVE_TWO;
+               break;
+       case MONO_TYPE_R4:
+       case MONO_TYPE_R8:
+               save_mode = SAVE_FP;
+               break;
+       case MONO_TYPE_VALUETYPE:
+               if (method->signature->ret->data.klass->enumtype) {
+                       rtype = method->signature->ret->data.klass->enum_basetype->type;
+                       goto handle_enum;
+               }
+               save_mode = SAVE_STRUCT;
+               break;
+       default:
+               save_mode = SAVE_ONE;
+               break;
+       }
+
+       switch (save_mode) {
+       case SAVE_TWO:
+               //x86_push_reg (code, X86_EDX);
+               //x86_push_reg (code, X86_EAX);
+               if (enable_arguments) {
+                       //x86_push_reg (code, X86_EDX);
+                       //x86_push_reg (code, X86_EAX);
+                       arg_size = 8;
+               }
+               break;
+       case SAVE_ONE:
+               //x86_push_reg (code, X86_EAX);
+               if (enable_arguments) {
+                       //x86_push_reg (code, X86_EAX);
+                       arg_size = 4;
+               }
+               break;
+       case SAVE_FP:
+               //x86_alu_reg_imm (code, X86_SUB, X86_ESP, 8);
+               ///x86_fst_membase (code, X86_ESP, 0, TRUE, TRUE);
+               if (enable_arguments) {
+                       //x86_alu_reg_imm (code, X86_SUB, X86_ESP, 8);
+                       //x86_fst_membase (code, X86_ESP, 0, TRUE, TRUE);
+                       arg_size = 8;
+               }
+               break;
+       case SAVE_STRUCT:
+               if (enable_arguments) {
+                       //x86_push_membase (code, X86_EBP, 8);
+                       arg_size = 4;
+               }
+               break;
+       case SAVE_NONE:
+       default:
+               break;
+       }
+
+       /*x86_push_imm (code, method);
+       mono_add_patch_info (cfg, code-cfg->native_code, MONO_PATCH_INFO_ABS, func);
+       x86_call_code (code, 0);
+       x86_alu_reg_imm (code, X86_ADD, X86_ESP, arg_size + 4);
+       */
+
+       switch (save_mode) {
+       case SAVE_TWO:
+               //x86_pop_reg (code, X86_EAX);
+               //x86_pop_reg (code, X86_EDX);
+               break;
+       case SAVE_ONE:
+               //x86_pop_reg (code, X86_EAX);
+               break;
+       case SAVE_FP:
+               //x86_fld_membase (code, X86_ESP, 0, TRUE);
+               //x86_alu_reg_imm (code, X86_ADD, X86_ESP, 8);
+               break;
+       case SAVE_NONE:
+       default:
+               break;
+       }
+
+       return code;
+}
+
+#define EMIT_COND_BRANCH(ins,cond) \
+if (ins->flags & MONO_INST_BRLABEL) { \
+        if (ins->inst_i0->inst_c0) { \
+               ppc_bc (code, branch_b0_table [cond], branch_b1_table [cond], (code - cfg->native_code + ins->inst_i0->inst_c0) & 0xffff);      \
+        } else { \
+               mono_add_patch_info (cfg, code - cfg->native_code, MONO_PATCH_INFO_LABEL, ins->inst_i0); \
+               ppc_bc (code, branch_b0_table [cond], branch_b1_table [cond], 0);       \
+        } \
+} else { \
+        if (0 && ins->inst_true_bb->native_offset) { \
+               ppc_bc (code, branch_b0_table [cond], branch_b1_table [cond], (code - cfg->native_code + ins->inst_true_bb->native_offset) & 0xffff); \
+        } else { \
+               mono_add_patch_info (cfg, code - cfg->native_code, MONO_PATCH_INFO_BB, ins->inst_true_bb); \
+               ppc_bc (code, branch_b0_table [cond], branch_b1_table [cond], 0);       \
+        } \
+}
+
+/* emit an exception if condition is fail */
+#define EMIT_COND_SYSTEM_EXCEPTION(cond,signed,exc_name)            \
+        do {                                                        \
+               mono_add_patch_info (cfg, code - cfg->native_code,   \
+                                   MONO_PATCH_INFO_EXC, exc_name);  \
+               x86_branch32 (code, cond, 0, signed);               \
+       } while (0); 
+
+#define EMIT_FPCOMPARE(code) do { \
+       x86_fcompp (code); \
+       x86_fnstsw (code); \
+       x86_alu_reg_imm (code, X86_AND, X86_EAX, 0x4500); \
+} while (0); 
+
+static void
+peephole_pass (MonoCompile *cfg, MonoBasicBlock *bb)
+{
+       MonoInst *ins, *last_ins = NULL;
+       ins = bb->code;
+
+       while (ins) {
+
+               switch (ins->opcode) {
+               case OP_MUL_IMM: 
+                       /* remove unnecessary multiplication with 1 */
+                       if (ins->inst_imm == 1) {
+                               if (ins->dreg != ins->sreg1) {
+                                       ins->opcode = OP_MOVE;
+                               } else {
+                                       last_ins->next = ins->next;                             
+                                       ins = ins->next;                                
+                                       continue;
+                               }
+                       }
+                       break;
+               case OP_LOAD_MEMBASE:
+               case OP_LOADI4_MEMBASE:
+                       /* 
+                        * OP_STORE_MEMBASE_REG reg, offset(basereg) 
+                        * OP_LOAD_MEMBASE offset(basereg), reg
+                        */
+                       if (last_ins && (last_ins->opcode == OP_STOREI4_MEMBASE_REG 
+                                        || last_ins->opcode == OP_STORE_MEMBASE_REG) &&
+                           ins->inst_basereg == last_ins->inst_destbasereg &&
+                           ins->inst_offset == last_ins->inst_offset) {
+                               if (ins->dreg == last_ins->sreg1) {
+                                       last_ins->next = ins->next;                             
+                                       ins = ins->next;                                
+                                       continue;
+                               } else {
+                                       //static int c = 0; printf ("MATCHX %s %d\n", cfg->method->name,c++);
+                                       ins->opcode = OP_MOVE;
+                                       ins->sreg1 = last_ins->sreg1;
+                               }
+
+                       /* 
+                        * Note: reg1 must be different from the basereg in the second load
+                        * OP_LOAD_MEMBASE offset(basereg), reg1
+                        * OP_LOAD_MEMBASE offset(basereg), reg2
+                        * -->
+                        * OP_LOAD_MEMBASE offset(basereg), reg1
+                        * OP_MOVE reg1, reg2
+                        */
+                       } if (last_ins && (last_ins->opcode == OP_LOADI4_MEMBASE
+                                          || last_ins->opcode == OP_LOAD_MEMBASE) &&
+                             ins->inst_basereg != last_ins->dreg &&
+                             ins->inst_basereg == last_ins->inst_basereg &&
+                             ins->inst_offset == last_ins->inst_offset) {
+
+                               if (ins->dreg == last_ins->dreg) {
+                                       last_ins->next = ins->next;                             
+                                       ins = ins->next;                                
+                                       continue;
+                               } else {
+                                       ins->opcode = OP_MOVE;
+                                       ins->sreg1 = last_ins->dreg;
+                               }
+
+                               //g_assert_not_reached ();
+
+#if 0
+                       /* 
+                        * OP_STORE_MEMBASE_IMM imm, offset(basereg) 
+                        * OP_LOAD_MEMBASE offset(basereg), reg
+                        * -->
+                        * OP_STORE_MEMBASE_IMM imm, offset(basereg) 
+                        * OP_ICONST reg, imm
+                        */
+                       } else if (last_ins && (last_ins->opcode == OP_STOREI4_MEMBASE_IMM
+                                               || last_ins->opcode == OP_STORE_MEMBASE_IMM) &&
+                                  ins->inst_basereg == last_ins->inst_destbasereg &&
+                                  ins->inst_offset == last_ins->inst_offset) {
+                               //static int c = 0; printf ("MATCHX %s %d\n", cfg->method->name,c++);
+                               ins->opcode = OP_ICONST;
+                               ins->inst_c0 = last_ins->inst_imm;
+                               g_assert_not_reached (); // check this rule
+#endif
+                       }
+                       break;
+               case OP_LOADU1_MEMBASE:
+               case OP_LOADI1_MEMBASE:
+                       if (last_ins && (last_ins->opcode == OP_STOREI1_MEMBASE_REG) &&
+                                       ins->inst_basereg == last_ins->inst_destbasereg &&
+                                       ins->inst_offset == last_ins->inst_offset) {
+                               if (ins->dreg == last_ins->sreg1) {
+                                       last_ins->next = ins->next;                             
+                                       ins = ins->next;                                
+                                       continue;
+                               } else {
+                                       //static int c = 0; printf ("MATCHX %s %d\n", cfg->method->name,c++);
+                                       ins->opcode = OP_MOVE;
+                                       ins->sreg1 = last_ins->sreg1;
+                               }
+                       }
+                       break;
+               case OP_LOADU2_MEMBASE:
+               case OP_LOADI2_MEMBASE:
+                       if (last_ins && (last_ins->opcode == OP_STOREI2_MEMBASE_REG) &&
+                                       ins->inst_basereg == last_ins->inst_destbasereg &&
+                                       ins->inst_offset == last_ins->inst_offset) {
+                               if (ins->dreg == last_ins->sreg1) {
+                                       last_ins->next = ins->next;                             
+                                       ins = ins->next;                                
+                                       continue;
+                               } else {
+                                       //static int c = 0; printf ("MATCHX %s %d\n", cfg->method->name,c++);
+                                       ins->opcode = OP_MOVE;
+                                       ins->sreg1 = last_ins->sreg1;
+                               }
+                       }
+                       break;
+               case CEE_CONV_I4:
+               case CEE_CONV_U4:
+               case OP_MOVE:
+                       /* 
+                        * OP_MOVE reg, reg 
+                        */
+                       if (ins->dreg == ins->sreg1) {
+                               if (last_ins)
+                                       last_ins->next = ins->next;                             
+                               ins = ins->next;
+                               continue;
+                       }
+                       /* 
+                        * OP_MOVE sreg, dreg 
+                        * OP_MOVE dreg, sreg
+                        */
+                       if (last_ins && last_ins->opcode == OP_MOVE &&
+                           ins->sreg1 == last_ins->dreg &&
+                           ins->dreg == last_ins->sreg1) {
+                               last_ins->next = ins->next;                             
+                               ins = ins->next;                                
+                               continue;
+                       }
+                       break;
+               }
+               last_ins = ins;
+               ins = ins->next;
+       }
+       bb->last_ins = last_ins;
+}
+
+/* 
+ * the branch_b0_table should maintain the order of these
+ * opcodes.
+case CEE_BEQ:
+case CEE_BGE:
+case CEE_BGT:
+case CEE_BLE:
+case CEE_BLT:
+case CEE_BNE_UN:
+case CEE_BGE_UN:
+case CEE_BGT_UN:
+case CEE_BLE_UN:
+case CEE_BLT_UN:
+ */
+static const guchar 
+branch_b0_table [] = {
+       PPC_BR_TRUE, 
+       PPC_BR_FALSE, 
+       PPC_BR_TRUE, 
+       PPC_BR_FALSE, 
+       PPC_BR_TRUE, 
+       
+       PPC_BR_FALSE, 
+       PPC_BR_FALSE, 
+       PPC_BR_TRUE, 
+       PPC_BR_FALSE,
+       PPC_BR_TRUE
+};
+
+static const guchar 
+branch_b1_table [] = {
+       PPC_BR_EQ, 
+       PPC_BR_LT, 
+       PPC_BR_GT, 
+       PPC_BR_GT,
+       PPC_BR_LT, 
+       
+       PPC_BR_EQ, 
+       PPC_BR_LT, 
+       PPC_BR_GT, 
+       PPC_BR_GT,
+       PPC_BR_LT 
+};
+
+#undef DEBUG
+#define DEBUG(a) if (cfg->verbose_level > 1) a
+//#define DEBUG(a)
+#define reg_is_freeable(r) ((r) >= 3 && (r) <= 10)
+
+typedef struct {
+       int born_in;
+       int killed_in;
+       int last_use;
+       int prev_use;
+} RegTrack;
+
+static const char*const * ins_spec = ppcg4;
+
+static void
+print_ins (int i, MonoInst *ins)
+{
+       const char *spec = ins_spec [ins->opcode];
+       g_print ("\t%-2d %s", i, mono_inst_name (ins->opcode));
+       if (spec [MONO_INST_DEST]) {
+               if (ins->dreg >= MONO_MAX_IREGS)
+                       g_print (" R%d <-", ins->dreg);
+               else
+                       g_print (" %s <-", mono_arch_regname (ins->dreg));
+       }
+       if (spec [MONO_INST_SRC1]) {
+               if (ins->sreg1 >= MONO_MAX_IREGS)
+                       g_print (" R%d", ins->sreg1);
+               else
+                       g_print (" %s", mono_arch_regname (ins->sreg1));
+       }
+       if (spec [MONO_INST_SRC2]) {
+               if (ins->sreg2 >= MONO_MAX_IREGS)
+                       g_print (" R%d", ins->sreg2);
+               else
+                       g_print (" %s", mono_arch_regname (ins->sreg2));
+       }
+       if (spec [MONO_INST_CLOB])
+               g_print (" clobbers: %c", spec [MONO_INST_CLOB]);
+       g_print ("\n");
+}
+
+static void
+print_regtrack (RegTrack *t, int num)
+{
+       int i;
+       char buf [32];
+       const char *r;
+       
+       for (i = 0; i < num; ++i) {
+               if (!t [i].born_in)
+                       continue;
+               if (i >= MONO_MAX_IREGS) {
+                       g_snprintf (buf, sizeof(buf), "R%d", i);
+                       r = buf;
+               } else
+                       r = mono_arch_regname (i);
+               g_print ("liveness: %s [%d - %d]\n", r, t [i].born_in, t[i].last_use);
+       }
+}
+
+typedef struct InstList InstList;
+
+struct InstList {
+       InstList *prev;
+       InstList *next;
+       MonoInst *data;
+};
+
+static inline InstList*
+inst_list_prepend (MonoMemPool *pool, InstList *list, MonoInst *data)
+{
+       InstList *item = mono_mempool_alloc (pool, sizeof (InstList));
+       item->data = data;
+       item->prev = NULL;
+       item->next = list;
+       if (list)
+               list->prev = item;
+       return item;
+}
+
+/*
+ * Force the spilling of the variable in the symbolic register 'reg'.
+ */
+static int
+get_register_force_spilling (MonoCompile *cfg, InstList *item, MonoInst *ins, int reg)
+{
+       MonoInst *load;
+       int i, sel, spill;
+       
+       sel = cfg->rs->iassign [reg];
+       /*i = cfg->rs->isymbolic [sel];
+       g_assert (i == reg);*/
+       i = reg;
+       spill = ++cfg->spill_count;
+       cfg->rs->iassign [i] = -spill - 1;
+       mono_regstate_free_int (cfg->rs, sel);
+       /* we need to create a spill var and insert a load to sel after the current instruction */
+       MONO_INST_NEW (cfg, load, OP_LOAD_MEMBASE);
+       load->dreg = sel;
+       load->inst_basereg = cfg->frame_reg;
+       load->inst_offset = mono_spillvar_offset (cfg, spill);
+       if (item->prev) {
+               while (ins->next != item->prev->data)
+                       ins = ins->next;
+       }
+       load->next = ins->next;
+       ins->next = load;
+       DEBUG (g_print ("SPILLED LOAD (%d at 0x%08x(%%sp)) R%d (freed %s)\n", spill, load->inst_offset, i, mono_arch_regname (sel)));
+       i = mono_regstate_alloc_int (cfg->rs, 1 << sel);
+       g_assert (i == sel);
+
+       return sel;
+}
+
+static int
+get_register_spilling (MonoCompile *cfg, InstList *item, MonoInst *ins, guint32 regmask, int reg)
+{
+       MonoInst *load;
+       int i, sel, spill;
+
+       DEBUG (g_print ("start regmask to assign R%d: 0x%08x (R%d <- R%d R%d)\n", reg, regmask, ins->dreg, ins->sreg1, ins->sreg2));
+       /* exclude the registers in the current instruction */
+       if (reg != ins->sreg1 && (reg_is_freeable (ins->sreg1) || (ins->sreg1 >= MONO_MAX_IREGS && cfg->rs->iassign [ins->sreg1] >= 0))) {
+               if (ins->sreg1 >= MONO_MAX_IREGS)
+                       regmask &= ~ (1 << cfg->rs->iassign [ins->sreg1]);
+               else
+                       regmask &= ~ (1 << ins->sreg1);
+               DEBUG (g_print ("excluding sreg1 %s\n", mono_arch_regname (ins->sreg1)));
+       }
+       if (reg != ins->sreg2 && (reg_is_freeable (ins->sreg2) || (ins->sreg2 >= MONO_MAX_IREGS && cfg->rs->iassign [ins->sreg2] >= 0))) {
+               if (ins->sreg2 >= MONO_MAX_IREGS)
+                       regmask &= ~ (1 << cfg->rs->iassign [ins->sreg2]);
+               else
+                       regmask &= ~ (1 << ins->sreg2);
+               DEBUG (g_print ("excluding sreg2 %s %d\n", mono_arch_regname (ins->sreg2), ins->sreg2));
+       }
+       if (reg != ins->dreg && reg_is_freeable (ins->dreg)) {
+               regmask &= ~ (1 << ins->dreg);
+               DEBUG (g_print ("excluding dreg %s\n", mono_arch_regname (ins->dreg)));
+       }
+
+       DEBUG (g_print ("available regmask: 0x%08x\n", regmask));
+       g_assert (regmask); /* need at least a register we can free */
+       sel = -1;
+       /* we should track prev_use and spill the register that's farther */
+       for (i = 0; i < MONO_MAX_IREGS; ++i) {
+               if (regmask & (1 << i)) {
+                       sel = i;
+                       DEBUG (g_print ("selected register %s has assignment %d\n", mono_arch_regname (sel), cfg->rs->iassign [sel]));
+                       break;
+               }
+       }
+       i = cfg->rs->isymbolic [sel];
+       spill = ++cfg->spill_count;
+       cfg->rs->iassign [i] = -spill - 1;
+       mono_regstate_free_int (cfg->rs, sel);
+       /* we need to create a spill var and insert a load to sel after the current instruction */
+       MONO_INST_NEW (cfg, load, OP_LOAD_MEMBASE);
+       load->dreg = sel;
+       load->inst_basereg = cfg->frame_reg;
+       load->inst_offset = mono_spillvar_offset (cfg, spill);
+       if (item->prev) {
+               while (ins->next != item->prev->data)
+                       ins = ins->next;
+       }
+       load->next = ins->next;
+       ins->next = load;
+       DEBUG (g_print ("SPILLED LOAD (%d at 0x%08x(%%sp)) R%d (freed %s)\n", spill, load->inst_offset, i, mono_arch_regname (sel)));
+       i = mono_regstate_alloc_int (cfg->rs, 1 << sel);
+       g_assert (i == sel);
+       
+       return sel;
+}
+
+static MonoInst*
+create_copy_ins (MonoCompile *cfg, int dest, int src, MonoInst *ins)
+{
+       MonoInst *copy;
+       MONO_INST_NEW (cfg, copy, OP_MOVE);
+       copy->dreg = dest;
+       copy->sreg1 = src;
+       if (ins) {
+               copy->next = ins->next;
+               ins->next = copy;
+       }
+       DEBUG (g_print ("\tforced copy from %s to %s\n", mono_arch_regname (src), mono_arch_regname (dest)));
+       return copy;
+}
+
+static MonoInst*
+create_spilled_store (MonoCompile *cfg, int spill, int reg, int prev_reg, MonoInst *ins)
+{
+       MonoInst *store;
+       MONO_INST_NEW (cfg, store, OP_STORE_MEMBASE_REG);
+       store->sreg1 = reg;
+       store->inst_destbasereg = ppc_r1;
+       store->inst_offset = mono_spillvar_offset (cfg, spill);
+       if (ins) {
+               store->next = ins->next;
+               ins->next = store;
+       }
+       DEBUG (g_print ("SPILLED STORE (%d at 0x%08x(%%sp)) R%d (from %s)\n", spill, store->inst_offset, prev_reg, mono_arch_regname (reg)));
+       return store;
+}
+
+static void
+insert_before_ins (MonoInst *ins, InstList *item, MonoInst* to_insert)
+{
+       MonoInst *prev;
+       g_assert (item->next);
+       prev = item->next->data;
+
+       while (prev->next != ins)
+               prev = prev->next;
+       to_insert->next = ins;
+       prev->next = to_insert;
+       /* 
+        * needed otherwise in the next instruction we can add an ins to the 
+        * end and that would get past this instruction.
+        */
+       item->data = to_insert; 
+}
+
+static int
+alloc_int_reg (MonoCompile *cfg, InstList *curinst, MonoInst *ins, int sym_reg, guint32 allow_mask)
+{
+       int val = cfg->rs->iassign [sym_reg];
+       if (val < 0) {
+               int spill = 0;
+               if (val < -1) {
+                       /* the register gets spilled after this inst */
+                       spill = -val -1;
+               }
+               val = mono_regstate_alloc_int (cfg->rs, allow_mask);
+               if (val < 0)
+                       val = get_register_spilling (cfg, curinst, ins, allow_mask, sym_reg);
+               cfg->rs->iassign [sym_reg] = val;
+               /* add option to store before the instruction for src registers */
+               if (spill)
+                       create_spilled_store (cfg, spill, val, sym_reg, ins);
+       }
+       cfg->rs->isymbolic [val] = sym_reg;
+       return val;
+}
+
+/* use ppc_r3-ppc_310 as temp registers */
+#define PPC_CALLER_REGS (0xf<<3)
+
+/*
+ * Local register allocation.
+ * We first scan the list of instructions and we save the liveness info of
+ * each register (when the register is first used, when it's value is set etc.).
+ * We also reverse the list of instructions (in the InstList list) because assigning
+ * registers backwards allows for more tricks to be used.
+ */
+void
+mono_arch_local_regalloc (MonoCompile *cfg, MonoBasicBlock *bb)
+{
+       MonoInst *ins;
+       MonoRegState *rs = cfg->rs;
+       int i, val, fpcount;
+       RegTrack *reginfo, *reginfof;
+       RegTrack *reginfo1, *reginfo2, *reginfod;
+       InstList *tmp, *reversed = NULL;
+       const char *spec;
+       guint32 src1_mask, src2_mask, dest_mask;
+
+       if (!bb->code)
+               return;
+       rs->next_vireg = bb->max_ireg;
+       rs->next_vfreg = bb->max_freg;
+       mono_regstate_assign (rs);
+       reginfo = mono_mempool_alloc0 (cfg->mempool, sizeof (RegTrack) * rs->next_vireg);
+       reginfof = mono_mempool_alloc0 (cfg->mempool, sizeof (RegTrack) * rs->next_vfreg);
+       rs->ifree_mask = PPC_CALLER_REGS;
+
+       ins = bb->code;
+       i = 1;
+       fpcount = 0; /* FIXME: track fp stack utilization */
+       DEBUG (g_print ("LOCAL regalloc: basic block: %d\n", bb->block_num));
+       /* forward pass on the instructions to collect register liveness info */
+       while (ins) {
+               spec = ins_spec [ins->opcode];
+               DEBUG (print_ins (i, ins));
+               if (spec [MONO_INST_SRC1]) {
+                       if (spec [MONO_INST_SRC1] == 'f')
+                               reginfo1 = reginfof;
+                       else
+                               reginfo1 = reginfo;
+                       reginfo1 [ins->sreg1].prev_use = reginfo1 [ins->sreg1].last_use;
+                       reginfo1 [ins->sreg1].last_use = i;
+               } else {
+                       ins->sreg1 = -1;
+               }
+               if (spec [MONO_INST_SRC2]) {
+                       if (spec [MONO_INST_SRC2] == 'f')
+                               reginfo2 = reginfof;
+                       else
+                               reginfo2 = reginfo;
+                       reginfo2 [ins->sreg2].prev_use = reginfo2 [ins->sreg2].last_use;
+                       reginfo2 [ins->sreg2].last_use = i;
+               } else {
+                       ins->sreg2 = -1;
+               }
+               if (spec [MONO_INST_DEST]) {
+                       if (spec [MONO_INST_DEST] == 'f')
+                               reginfod = reginfof;
+                       else
+                               reginfod = reginfo;
+                       if (spec [MONO_INST_DEST] != 'b') /* it's not just a base register */
+                               reginfod [ins->dreg].killed_in = i;
+                       reginfod [ins->dreg].prev_use = reginfod [ins->dreg].last_use;
+                       reginfod [ins->dreg].last_use = i;
+                       if (reginfod [ins->dreg].born_in == 0 || reginfod [ins->dreg].born_in > i)
+                               reginfod [ins->dreg].born_in = i;
+                       if (spec [MONO_INST_DEST] == 'l') {
+                               /* result in eax:edx, the virtual register is allocated sequentially */
+                               reginfod [ins->dreg + 1].prev_use = reginfod [ins->dreg + 1].last_use;
+                               reginfod [ins->dreg + 1].last_use = i;
+                               if (reginfod [ins->dreg + 1].born_in == 0 || reginfod [ins->dreg + 1].born_in > i)
+                                       reginfod [ins->dreg + 1].born_in = i;
+                       }
+               } else {
+                       ins->dreg = -1;
+               }
+               reversed = inst_list_prepend (cfg->mempool, reversed, ins);
+               ++i;
+               ins = ins->next;
+       }
+
+       DEBUG (print_regtrack (reginfo, rs->next_vireg));
+       DEBUG (print_regtrack (reginfof, rs->next_vfreg));
+       tmp = reversed;
+       while (tmp) {
+               int prev_dreg, prev_sreg1, prev_sreg2;
+               dest_mask = src1_mask = src2_mask = PPC_CALLER_REGS;
+               --i;
+               ins = tmp->data;
+               spec = ins_spec [ins->opcode];
+               DEBUG (g_print ("processing:"));
+               DEBUG (print_ins (i, ins));
+               /* update for use with FP regs... */
+               if (spec [MONO_INST_DEST] != 'f' && ins->dreg >= MONO_MAX_IREGS) {
+                       val = rs->iassign [ins->dreg];
+                       prev_dreg = ins->dreg;
+                       if (val < 0) {
+                               int spill = 0;
+                               if (val < -1) {
+                                       /* the register gets spilled after this inst */
+                                       spill = -val -1;
+                               }
+                               val = mono_regstate_alloc_int (rs, dest_mask);
+                               if (val < 0)
+                                       val = get_register_spilling (cfg, tmp, ins, dest_mask, ins->dreg);
+                               rs->iassign [ins->dreg] = val;
+                               if (spill)
+                                       create_spilled_store (cfg, spill, val, prev_dreg, ins);
+                       }
+                       DEBUG (g_print ("\tassigned dreg %s to dest R%d\n", mono_arch_regname (val), ins->dreg));
+                       rs->isymbolic [val] = prev_dreg;
+                       ins->dreg = val;
+                       if (spec [MONO_INST_DEST] == 'l') {
+                               int hreg = prev_dreg + 1;
+                               val = rs->iassign [hreg];
+                               if (val < 0) {
+                                       int spill = 0;
+                                       if (val < -1) {
+                                               /* the register gets spilled after this inst */
+                                               spill = -val -1;
+                                       }
+                                       val = mono_regstate_alloc_int (rs, dest_mask);
+                                       if (val < 0)
+                                               val = get_register_spilling (cfg, tmp, ins, dest_mask, hreg);
+                                       rs->iassign [hreg] = val;
+                                       if (spill)
+                                               create_spilled_store (cfg, spill, val, hreg, ins);
+                               }
+                               DEBUG (g_print ("\tassigned hreg %s to dest R%d\n", mono_arch_regname (val), hreg));
+                               rs->isymbolic [val] = hreg;
+                               /* FIXME:? ins->dreg = val; */
+                               if (ins->dreg == ppc_r4) {
+                                       if (val != ppc_r3)
+                                               create_copy_ins (cfg, val, ppc_r3, ins);
+                               } else if (ins->dreg == ppc_r3) {
+                                       if (val == ppc_r4) {
+                                               /* swap */
+                                               create_copy_ins (cfg, ppc_r0, ppc_r3, ins);
+                                               create_copy_ins (cfg, ppc_r3, ppc_r4, ins);
+                                               create_copy_ins (cfg, ppc_r4, ppc_r0, ins);
+                                       } else {
+                                               /* two forced copies */
+                                               create_copy_ins (cfg, val, ppc_r3, ins);
+                                               create_copy_ins (cfg, ins->dreg, ppc_r4, ins);
+                                       }
+                               } else {
+                                       if (val == ppc_r3) {
+                                               create_copy_ins (cfg, ins->dreg, ppc_r4, ins);
+                                       } else {
+                                               /* two forced copies */
+                                               create_copy_ins (cfg, val, ppc_r3, ins);
+                                               create_copy_ins (cfg, ins->dreg, ppc_r4, ins);
+                                       }
+                               }
+                               if (reg_is_freeable (val) && hreg >= 0 && reginfo [hreg].born_in >= i) {
+                                       DEBUG (g_print ("\tfreeable %s (R%d)\n", mono_arch_regname (val), hreg));
+                                       mono_regstate_free_int (rs, val);
+                               }
+                       }
+               } else {
+                       prev_dreg = -1;
+               }
+               if (spec [MONO_INST_DEST] != 'f' && reg_is_freeable (ins->dreg) && prev_dreg >= 0 && reginfo [prev_dreg].born_in >= i) {
+                       DEBUG (g_print ("\tfreeable %s (R%d) (born in %d)\n", mono_arch_regname (ins->dreg), prev_dreg, reginfo [prev_dreg].born_in));
+                       mono_regstate_free_int (rs, ins->dreg);
+               }
+               if (spec [MONO_INST_SRC1] != 'f' && ins->sreg1 >= MONO_MAX_IREGS) {
+                       val = rs->iassign [ins->sreg1];
+                       prev_sreg1 = ins->sreg1;
+                       if (val < 0) {
+                               int spill = 0;
+                               if (val < -1) {
+                                       /* the register gets spilled after this inst */
+                                       spill = -val -1;
+                               }
+                               if (0 && ins->opcode == OP_MOVE) {
+                                       /* 
+                                        * small optimization: the dest register is already allocated
+                                        * but the src one is not: we can simply assign the same register
+                                        * here and peephole will get rid of the instruction later.
+                                        * This optimization may interfere with the clobbering handling:
+                                        * it removes a mov operation that will be added again to handle clobbering.
+                                        * There are also some other issues that should with make testjit.
+                                        */
+                                       mono_regstate_alloc_int (rs, 1 << ins->dreg);
+                                       val = rs->iassign [ins->sreg1] = ins->dreg;
+                                       //g_assert (val >= 0);
+                                       DEBUG (g_print ("\tfast assigned sreg1 %s to R%d\n", mono_arch_regname (val), ins->sreg1));
+                               } else {
+                                       //g_assert (val == -1); /* source cannot be spilled */
+                                       val = mono_regstate_alloc_int (rs, src1_mask);
+                                       if (val < 0)
+                                               val = get_register_spilling (cfg, tmp, ins, src1_mask, ins->sreg1);
+                                       rs->iassign [ins->sreg1] = val;
+                                       DEBUG (g_print ("\tassigned sreg1 %s to R%d\n", mono_arch_regname (val), ins->sreg1));
+                               }
+                               if (spill) {
+                                       MonoInst *store = create_spilled_store (cfg, spill, val, prev_sreg1, NULL);
+                                       insert_before_ins (ins, tmp, store);
+                               }
+                       }
+                       rs->isymbolic [val] = prev_sreg1;
+                       ins->sreg1 = val;
+               } else {
+                       prev_sreg1 = -1;
+               }
+               if (spec [MONO_INST_SRC2] != 'f' && ins->sreg2 >= MONO_MAX_IREGS) {
+                       val = rs->iassign [ins->sreg2];
+                       prev_sreg2 = ins->sreg2;
+                       if (val < 0) {
+                               int spill = 0;
+                               if (val < -1) {
+                                       /* the register gets spilled after this inst */
+                                       spill = -val -1;
+                               }
+                               val = mono_regstate_alloc_int (rs, src2_mask);
+                               if (val < 0)
+                                       val = get_register_spilling (cfg, tmp, ins, src2_mask, ins->sreg2);
+                               rs->iassign [ins->sreg2] = val;
+                               DEBUG (g_print ("\tassigned sreg2 %s to R%d\n", mono_arch_regname (val), ins->sreg2));
+                               if (spill)
+                                       create_spilled_store (cfg, spill, val, prev_sreg2, ins);
+                       }
+                       rs->isymbolic [val] = prev_sreg2;
+                       ins->sreg2 = val;
+               } else {
+                       prev_sreg2 = -1;
+               }
+
+               if (spec [MONO_INST_CLOB] == 'c') {
+                       int j, s;
+                       guint32 clob_mask = PPC_CALLER_REGS;
+                       for (j = 0; j < MONO_MAX_IREGS; ++j) {
+                               s = 1 << j;
+                               if ((clob_mask & s) && !(rs->ifree_mask & s) && j != ins->sreg1) {
+                                       //g_warning ("register %s busy at call site\n", mono_arch_regname (j));
+                               }
+                       }
+               }
+               /*if (reg_is_freeable (ins->sreg1) && prev_sreg1 >= 0 && reginfo [prev_sreg1].born_in >= i) {
+                       DEBUG (g_print ("freeable %s\n", mono_arch_regname (ins->sreg1)));
+                       mono_regstate_free_int (rs, ins->sreg1);
+               }
+               if (reg_is_freeable (ins->sreg2) && prev_sreg2 >= 0 && reginfo [prev_sreg2].born_in >= i) {
+                       DEBUG (g_print ("freeable %s\n", mono_arch_regname (ins->sreg2)));
+                       mono_regstate_free_int (rs, ins->sreg2);
+               }*/
+               
+               //DEBUG (print_ins (i, ins));
+               tmp = tmp->next;
+       }
+}
+
+static guchar*
+emit_float_to_int (MonoCompile *cfg, guchar *code, int dreg, int size, gboolean is_signed)
+{
+       return code;
+}
+
+static unsigned char*
+mono_emit_stack_alloc (guchar *code, MonoInst* tree)
+{
+#if 0
+       int sreg = tree->sreg1;
+       x86_alu_reg_reg (code, X86_SUB, X86_ESP, tree->sreg1);
+       if (tree->flags & MONO_INST_INIT) {
+               int offset = 0;
+               if (tree->dreg != X86_EAX && sreg != X86_EAX) {
+                       x86_push_reg (code, X86_EAX);
+                       offset += 4;
+               }
+               if (tree->dreg != X86_ECX && sreg != X86_ECX) {
+                       x86_push_reg (code, X86_ECX);
+                       offset += 4;
+               }
+               if (tree->dreg != X86_EDI && sreg != X86_EDI) {
+                       x86_push_reg (code, X86_EDI);
+                       offset += 4;
+               }
+               
+               x86_shift_reg_imm (code, X86_SHR, sreg, 2);
+               if (sreg != X86_ECX)
+                       x86_mov_reg_reg (code, X86_ECX, sreg, 4);
+               x86_alu_reg_reg (code, X86_XOR, X86_EAX, X86_EAX);
+                               
+               x86_lea_membase (code, X86_EDI, X86_ESP, offset);
+               x86_cld (code);
+               x86_prefix (code, X86_REP_PREFIX);
+               x86_stosl (code);
+               
+               if (tree->dreg != X86_EDI && sreg != X86_EDI)
+                       x86_pop_reg (code, X86_EDI);
+               if (tree->dreg != X86_ECX && sreg != X86_ECX)
+                       x86_pop_reg (code, X86_ECX);
+               if (tree->dreg != X86_EAX && sreg != X86_EAX)
+                       x86_pop_reg (code, X86_EAX);
+       }
+#endif
+       return code;
+}
+
+void
+ppc_patch (guchar *code, guchar *target)
+{
+       guint32 ins = *(guint32*)code;
+       guint32 prim = ins >> 26;
+
+//     g_print ("patching 0x%08x (0x%08x) to point to 0x%08x\n", code, ins, target);
+       if (prim == 18) {
+               // absolute address
+               if (ins & 2) {
+                       guint32 li = (guint32)target;
+                       ins = prim << 26 | (ins & 3);
+                       ins |= li;
+                       // FIXME: assert the top bits of li are 0
+               } else {
+                       gint diff = target - code;
+                       ins = prim << 26 | (ins & 3);
+                       diff &= ~3;
+                       diff &= ~(63 << 26);
+                       ins |= diff;
+               }
+               *(guint32*)code = ins;
+       } else if (prim == 16) {
+               // absolute address
+               if (ins & 2) {
+                       guint32 li = (guint32)target;
+                       ins = (ins & 0xffff0000) | (ins & 3);
+                       li &= 0xffff;
+                       ins |= li;
+                       // FIXME: assert the top bits of li are 0
+               } else {
+                       gint diff = target - code;
+                       ins = (ins & 0xffff0000) | (ins & 3);
+                       diff &= 0xffff;
+                       ins |= diff;
+               }
+               *(guint32*)code = ins;
+       } else {
+               g_assert_not_reached ();
+       }
+//     g_print ("patched with 0x%08x\n", ins);
+}
+
+void
+mono_arch_output_basic_block (MonoCompile *cfg, MonoBasicBlock *bb)
+{
+       MonoInst *ins;
+       MonoCallInst *call;
+       guint offset;
+       guint8 *code = cfg->native_code + cfg->code_len;
+       MonoInst *last_ins = NULL;
+       guint last_offset = 0;
+       int max_len, cpos;
+
+       if (cfg->opt & MONO_OPT_PEEPHOLE)
+               peephole_pass (cfg, bb);
+
+#if 0
+       /* 
+        * various stratgies to align BBs. Using real loop detection or simply
+        * aligning every block leads to more consistent benchmark results,
+        * but usually slows down the code
+        * we should do the alignment outside this function or we should adjust
+        * bb->native offset as well or the code is effectively slowed down!
+        */
+       /* align all blocks */
+//     if ((pad = (cfg->code_len & (align - 1)))) {
+       /* poor man loop start detection */
+//     if (bb->code && bb->in_count && bb->in_bb [0]->cil_code > bb->cil_code && (pad = (cfg->code_len & (align - 1)))) {
+       /* consider real loop detection and nesting level */
+//     if (bb->loop_blocks && bb->nesting < 3 && (pad = (cfg->code_len & (align - 1)))) {
+       /* consider real loop detection */
+       if (/*bb->loop_blocks &&*/ (pad = (cfg->code_len & (align - 1)))) {
+               pad = align - pad;
+               x86_padding (code, pad);
+               cfg->code_len += pad;
+               bb->native_offset = cfg->code_len;
+       }
+#endif
+
+       if (cfg->verbose_level > 2)
+               g_print ("Basic block %d starting at offset 0x%x\n", bb->block_num, bb->native_offset);
+
+       cpos = bb->max_offset;
+
+       if (cfg->prof_options & MONO_PROFILE_COVERAGE) {
+               //MonoCoverageInfo *cov = mono_get_coverage_info (cfg->method);
+               //g_assert (!mono_compile_aot);
+               //cpos += 6;
+               //if (bb->cil_code)
+               //      cov->data [bb->dfn].iloffset = bb->cil_code - cfg->cil_code;
+               /* this is not thread save, but good enough */
+               /* fixme: howto handle overflows? */
+               //x86_inc_mem (code, &cov->data [bb->dfn].count); 
+       }
+
+       ins = bb->code;
+       while (ins) {
+               offset = code - cfg->native_code;
+
+               max_len = ((guint8 *)ins_spec [ins->opcode])[MONO_INST_LEN];
+
+               if (offset > (cfg->code_size - max_len - 16)) {
+                       cfg->code_size *= 2;
+                       cfg->native_code = g_realloc (cfg->native_code, cfg->code_size);
+                       code = cfg->native_code + offset;
+               }
+       //      if (ins->cil_code)
+       //              g_print ("cil code\n");
+
+               switch (ins->opcode) {
+               case OP_STOREI1_MEMBASE_IMM:
+                       sparc_ld_imm (code, sparc_l0, (ins->inst_offset), ins->inst_imm);
+//                     g_assert (ppc_is_imm16 (ins->inst_offset));
+                       sparc_stb (code, sparc_l0, (ins->inst_offset), ins->inst_destbasereg);
+                       break;
+               case OP_STOREI2_MEMBASE_IMM:
+                       sparc_ld_imm (code, sparc_l0, (ins->inst_offset), ins->inst_imm);
+//                     g_assert (ppc_is_imm16 (ins->inst_offset));
+                       sparc_sth (code, sparc_l0, ins->inst_offset, ins->inst_destbasereg);
+                       break;
+               case OP_STORE_MEMBASE_IMM:
+               case OP_STOREI4_MEMBASE_IMM:
+                       sparc_ld (code, sparc_l0, ins->inst_imm);
+//                     g_assert (ppc_is_imm16 (ins->inst_offset));
+                       sparc_st (code, sparc_l0, ins->inst_offset, ins->inst_destbasereg);
+                       break;
+               case OP_STOREI1_MEMBASE_REG:
+//                     g_assert (ppc_is_imm16 (ins->inst_offset));
+                       sparc_stb (code, ins->sreg1, ins->inst_offset, ins->inst_destbasereg);
+                       break;
+               case OP_STOREI2_MEMBASE_REG:
+//                     g_assert (ppc_is_imm16 (ins->inst_offset));
+                       sparc_sth (code, ins->sreg1, ins->inst_offset, ins->inst_destbasereg);
+                       break;
+               case OP_STORE_MEMBASE_REG:
+               case OP_STOREI4_MEMBASE_REG:
+//                     g_assert (ppc_is_imm16 (ins->inst_offset));
+                       sparc_st (code, ins->sreg1, ins->inst_offset, ins->inst_destbasereg);
+                       break;
+               case CEE_LDIND_I:
+               case CEE_LDIND_I4:
+               case CEE_LDIND_U4:
+                       g_assert_not_reached ();
+                       //x86_mov_reg_mem (code, ins->dreg, ins->inst_p0, 4);
+                       break;
+               case OP_LOADU4_MEM:
+                       g_assert_not_reached ();
+                       //x86_mov_reg_imm (code, ins->dreg, ins->inst_p0);
+                       //x86_mov_reg_membase (code, ins->dreg, ins->dreg, 0, 4);
+                       break;
+               case OP_LOAD_MEMBASE:
+               case OP_LOADI4_MEMBASE:
+               case OP_LOADU4_MEMBASE:
+                       if (ppc_is_imm16 (ins->inst_offset)) {
+                               sparc_ld (code, ins->dreg, ins->inst_offset, ins->inst_basereg);
+                       } else {
+                               sparc_ld (code, ppc_r11, ins->inst_offset);
+                               sparc_ld (code, ins->dreg, 0, ppc_r11);
+                       }
+                       break;
+               case OP_LOADU1_MEMBASE:
+//                     g_assert (ppc_is_imm16 (ins->inst_offset));
+                       sparc_ldub (code, ins->dreg, ins->inst_offset, ins->inst_basereg);
+                       break;
+               case OP_LOADI1_MEMBASE:
+                 //                    g_assert (ppc_is_imm16 (ins->inst_offset));
+                       // FIXME: sign extend
+                       sparc_ldub (code, ins->dreg, ins->inst_offset, ins->inst_basereg);
+                       break;
+               case OP_LOADU2_MEMBASE:
+                 //                    g_assert (ppc_is_imm16 (ins->inst_offset));
+                       sparc_lduh (code, ins->dreg, ins->inst_offset, ins->inst_basereg);
+                       break;
+               case OP_LOADI2_MEMBASE:
+                       g_assert (ppc_is_imm16 (ins->inst_offset));
+                       sparc_lduh (code, ins->dreg, ins->inst_basereg, ins->inst_offset);
+                       break;
+               case CEE_CONV_I1:
+                       sparc_sethi (code, ins->dreg, ins->sreg1);
+                       break;
+               case CEE_CONV_I2:
+                       sparc_set (code, ins->dreg, ins->sreg1);
+                       break;
+               case CEE_CONV_U1:
+                 //ppc_rlwinm (code, ins->dreg, ins->sreg1, 0, 24, 31);
+                       break;
+               case CEE_CONV_U2:
+                 //ppc_rlwinm (code, ins->dreg, ins->sreg1, 0, 16, 31);
+                       break;
+               case OP_COMPARE:
+                       sparc_cmp (code, 0, 0, ins->sreg1, ins->sreg2);
+                       break;
+               case OP_COMPARE_IMM:
+                       if (ppc_is_imm16 (ins->inst_imm)) {
+                               sparc_cmp_imm (code, 0, 0, ins->sreg1, (ins->inst_imm & 0xffff));
+                       } else {
+                               sparc_ld (code, ppc_r11, ins->inst_imm);
+                               sparc_cmp (code, 0, 0, ins->sreg1, ppc_r11);
+                       }
+                       break;
+               case OP_X86_TEST_NULL:
+                       sparc_cmp_imm (code, 0, 0, ins->sreg1, 0);
+                       break;
+               case CEE_BREAK:
+                 //                    ppc_break (code);
+                       break;
+               case OP_ADDCC:
+                       sparc_add (code, ins->dreg, ins->sreg1, ins->sreg2);
+                       //need to complement
+                       break;
+               case CEE_ADD:
+                       sparc_add (code, ins->dreg, ins->sreg1, ins->sreg2);
+                       break;
+               case OP_ADC:
+                       sparc_addx (code, ins->dreg, ins->sreg1, ins->sreg2);
+                       break;
+               case OP_ADD_IMM:
+                       if (ppc_is_imm16 (ins->inst_imm)) {
+                               sparc_add_imm (code, ins->dreg, ins->sreg1, ins->inst_imm);
+                       } else {
+                               sparc_ld (code, ppc_r11, ins->inst_imm);
+                               sparc_add (code, ins->dreg, ins->sreg1, ppc_r11);
+                       }
+                       break;
+               case OP_ADC_IMM:
+                       sparc_ld (code, ppc_r11, ins->inst_imm);
+                       sparc_addx (code, ins->dreg, ins->sreg1, ppc_r11);
+                       break;
+               case OP_SUBCC:
+                       sparc_sub (code, ins->dreg, ins->sreg2, ins->sreg1);
+                       break;
+               case CEE_SUB:
+                       sparc_sub (code, ins->dreg, ins->sreg2, ins->sreg1);
+                       break;
+               case OP_SBB:
+                       sparc_subx (code, ins->dreg, ins->sreg2, ins->sreg1);
+                       break;
+               case OP_SUB_IMM:
+                       // we add the negated value
+                 //                    g_assert (ppc_is_imm16 (-ins->inst_imm));
+                       sparc_add_imm (code, ins->dreg, ins->sreg1, -ins->inst_imm);
+                       break;
+               case OP_SBB_IMM:
+                       sparc_ld (code, ppc_r11, ins->inst_imm);
+                       sparc_sub (code, ins->dreg, ins->sreg2, ppc_r11);
+                       break;
+               case OP_PPC_SUBFIC:
+                 //                    g_assert (ppc_is_imm16 (ins->inst_imm));
+                       sparc_sub (code, ins->dreg, ins->sreg1, ins->inst_imm);
+                       break;
+               case OP_PPC_SUBFZE:
+                       sparc_sub (code, ins->dreg, ins->sreg1);
+                       break;
+               case CEE_AND:
+                       /* FIXME: the ppc macros as inconsistent here: put dest as the first arg! */
+                       sparc_and (code, ins->sreg1, ins->dreg, ins->sreg2);
+                       break;
+               case OP_AND_IMM:
+                       if (!(ins->inst_imm & 0xffff0000)) {
+                               sparc_and_imm (code, ins->sreg1, ins->dreg, ins->inst_imm);
+                       } else if (!(ins->inst_imm & 0xffff)) {
+                               sparc_and_imm (code, ins->sreg1, ins->dreg, ((guint32)ins->inst_imm >> 16));
+                       } else {
+                               sparc_ld (code, ppc_r11, ins->inst_imm);
+                               sparc_and (code, ins->sreg1, ins->dreg, ins->sreg2);
+                       }
+                       break;
+               case CEE_DIV:
+                       sparc_sdiv (code, ins->dreg, ins->sreg1, ins->sreg2);
+                       break;
+               case CEE_DIV_UN:
+                       sparc_udiv (code, ins->dreg, ins->sreg1, ins->sreg2);
+                       break;
+               case OP_DIV_IMM:
+                       sparc_ld (code, ppc_r11, ins->inst_imm);
+                       sparc_sdiv_imm (code, ins->dreg, ins->sreg1, ppc_r11);
+                       break;
+               case CEE_REM:
+                       sparc_sdiv (code, ppc_r11, ins->sreg1, ins->sreg2);
+                       sparc_muls (code, ppc_r11, ppc_r11, ins->sreg2);
+                       sparc_sub (code, ins->dreg, ppc_r11, ins->sreg1);
+                       break;
+               case CEE_REM_UN:
+                       sparc_udiv (code, ppc_r11, ins->sreg1, ins->sreg2);
+                       sparc_muls (code, ppc_r11, ppc_r11, ins->sreg2);
+                       sparc_sub (code, ins->dreg, ppc_r11, ins->sreg1);
+                       break;
+               case OP_REM_IMM:
+                       sparc_ld (code, ppc_r11, ins->inst_imm);
+                       sparc_sdiv (code, ins->dreg, ins->sreg1, ppc_r11);
+                       sparc_smul (code, ins->dreg, ins->dreg, ppc_r11);
+                       sparc_sub (code, ins->dreg, ins->dreg, ins->sreg1);
+                       break;
+               case CEE_OR:
+                       sparc_or (code, ins->dreg, ins->sreg1, ins->sreg2);
+                       break;
+               case OP_OR_IMM:
+                       if (!(ins->inst_imm & 0xffff0000)) {
+                               sparc_or (code, ins->sreg1, ins->dreg, ins->inst_imm);
+                       } else if (!(ins->inst_imm & 0xffff)) {
+                               sparc_orn (code, ins->sreg1, ins->dreg, ((guint32)(ins->inst_imm) >> 16));
+                       } else {
+                               sparc_ld (code, ppc_r11, ins->inst_imm);
+                               sparc_or (code, ins->sreg1, ins->dreg, ins->sreg2);
+                       }
+                       break;
+               case CEE_XOR:
+                       sparc_xor (code, ins->dreg, ins->sreg1, ins->sreg2);
+                       break;
+               case OP_XOR_IMM:
+                       if (!(ins->inst_imm & 0xffff0000)) {
+                               sparc_xor_imm (code, ins->sreg1, ins->dreg, ins->inst_imm);
+                       } else if (!(ins->inst_imm & 0xffff)) {
+                               ppc_xor_imm (code, ins->sreg1, ins->dreg, ((guint32)(ins->inst_imm) >> 16));
+                       } else {
+                               sparc_ld (code, ppc_r11, ins->inst_imm);
+                               sparc_xor (code, ins->sreg1, ins->dreg, ins->sreg2);
+                       }
+                       break;
+               case CEE_SHL:
+                       sparc_ld (code, ins->sreg1, ins->dreg, ins->sreg2);
+                       break;
+               case OP_SHL_IMM:
+                       ppc_rlwinm (code, ins->dreg, ins->sreg1, (ins->inst_imm & 0xf), 0, (31 - (ins->inst_imm & 0xf)));
+                       //ppc_load (code, ppc_r11, ins->inst_imm);
+                       //ppc_slw (code, ins->sreg1, ins->dreg, ppc_r11);
+                       break;
+               case CEE_SHR:
+                       ppc_sraw (code, ins->dreg, ins->sreg1, ins->sreg2);
+                       break;
+               case OP_SHR_IMM:
+                       // there is also ppc_srawi
+                       //ppc_load (code, ppc_r11, ins->inst_imm);
+                       //ppc_sraw (code, ins->dreg, ins->sreg1, ppc_r11);
+                       ppc_srawi (code, ins->dreg, ins->sreg1, (ins->inst_imm & 0x1f));
+                       break;
+               case OP_SHR_UN_IMM:
+                       sparc_ld (code, ppc_r11, ins->inst_imm);
+                       ppc_srw (code, ins->dreg, ins->sreg1, ppc_r11);
+                       //ppc_rlwinm (code, ins->dreg, ins->sreg1, (32 - (ins->inst_imm & 0xf)), (ins->inst_imm & 0xf), 31);
+                       break;
+               case CEE_SHR_UN:
+                       ppc_srw (code, ins->dreg, ins->sreg1, ins->sreg2);
+                       break;
+               case CEE_NOT:
+                       sparc_not (code, ins->dreg, ins->sreg1);
+                       break;
+               case CEE_NEG:
+                       sparc_neg (code, ins->dreg, ins->sreg1);
+                       break;
+               case CEE_MUL:
+                       sparc_mul (code, ins->dreg, ins->sreg1, ins->sreg2);
+                       break;
+               case OP_MUL_IMM:
+                       sparc_ld (code, ppc_r11, ins->inst_imm);
+                       sparc_mul_imm (code, ins->dreg, ins->sreg1, ppc_r11);
+                       break;
+               case CEE_MUL_OVF:
+                       sparc_mul (code, ins->dreg, ins->sreg1, ins->sreg2);
+                       //g_assert_not_reached ();
+                       //x86_imul_reg_reg (code, ins->sreg1, ins->sreg2);
+                       //EMIT_COND_SYSTEM_EXCEPTION (X86_CC_O, FALSE, "OverflowException");
+                       break;
+               case CEE_MUL_OVF_UN:
+                       sparc_mul (code, ins->dreg, ins->sreg1, ins->sreg2);
+                       //FIXME: g_assert_not_reached ();
+                       break;
+               case OP_ICONST:
+               case OP_SETREGIMM:
+                       sparc_ld (code, ins->dreg, ins->inst_c0);
+                       break;
+               /*case OP_CLASS:
+                       mono_add_patch_info (cfg, offset, MONO_PATCH_INFO_CLASS, (gpointer)ins->inst_c0);
+                       ppc_load (code, ins->dreg, 0xff00ff00);
+                       break;
+               case OP_IMAGE:
+                       mono_add_patch_info (cfg, offset, MONO_PATCH_INFO_IMAGE, (gpointer)ins->inst_c0);
+                       ppc_load (code, ins->dreg, 0xff00ff00);
+                       break;*/
+               case CEE_CONV_I4:
+               case CEE_CONV_U4:
+               case OP_MOVE:
+               case OP_SETREG:
+                       ppc_mr (code, ins->dreg, ins->sreg1);
+                       break;
+               case CEE_JMP:
+                       g_assert_not_reached ();
+                       break;
+               case OP_CHECK_THIS:
+                       /* ensure ins->sreg1 is not NULL */
+                       g_assert_not_reached ();
+                       //x86_alu_membase_imm (code, X86_CMP, ins->sreg1, 0, 0);
+                       break;
+               case OP_FCALL:
+               case OP_LCALL:
+               case OP_VCALL:
+               case OP_VOIDCALL:
+               case CEE_CALL:
+                       call = (MonoCallInst*)ins;
+                       if (ins->flags & MONO_INST_HAS_METHOD)
+                               mono_add_patch_info (cfg, offset, MONO_PATCH_INFO_METHOD, call->method);
+                       else
+                               mono_add_patch_info (cfg, offset, MONO_PATCH_INFO_ABS, call->fptr);
+                       ppc_bl (code, 0);
+                       break;
+               case OP_FCALL_REG:
+               case OP_LCALL_REG:
+               case OP_VCALL_REG:
+               case OP_VOIDCALL_REG:
+               case OP_CALL_REG:
+                       ppc_mtlr (code, ins->sreg1);
+                       ppc_blrl (code);
+                       break;
+               case OP_FCALL_MEMBASE:
+               case OP_LCALL_MEMBASE:
+               case OP_VCALL_MEMBASE:
+               case OP_VOIDCALL_MEMBASE:
+               case OP_CALL_MEMBASE:
+                       ppc_lwz (code, ppc_r0, ins->inst_offset, ins->sreg1);
+                       ppc_mtlr (code, ppc_r0);
+                       ppc_blrl (code);
+                       break;
+               case OP_OUTARG:
+                       g_assert_not_reached ();
+                       break;
+               case OP_LOCALLOC:
+                       /* keep alignment */
+#define MONO_FRAME_ALIGNMENT 32
+                       sparc_add_imm (code, ppc_r0, ins->sreg1, MONO_FRAME_ALIGNMENT-1);
+                       ppc_rlwinm (code, ppc_r0, ppc_r0, 0, 0, 27);
+                       ppc_lwz (code, ppc_r11, 0, ppc_sp);
+                       sparc_neg (code, ppc_r0, ppc_r0);
+                       ppc_stwux (code, ppc_sp, ppc_r0, ppc_sp);
+                       ppc_mr (code, ins->dreg, ppc_sp);
+                       g_assert_not_reached ();
+                       break;
+               case CEE_RET:
+                       ppc_blr (code);
+                       break;
+               case CEE_THROW: {
+                       ppc_mr (code, ppc_r3, ins->sreg1);
+                       mono_add_patch_info (cfg, code - cfg->native_code, MONO_PATCH_INFO_INTERNAL_METHOD, 
+                                            (gpointer)"throw_exception");
+                       ppc_bl (code, 0);
+                       break;
+               }
+               case OP_ENDFILTER:
+                       if (ins->sreg1 != ppc_r3)
+                               ppc_mr (code, ppc_r3, ins->sreg1);
+                       ppc_blr (code);
+                       break;
+               case CEE_ENDFINALLY:
+                       ppc_blr (code);
+                       break;
+               case OP_CALL_HANDLER: 
+                       mono_add_patch_info (cfg, code - cfg->native_code, MONO_PATCH_INFO_BB, ins->inst_target_bb);
+                       ppc_bl (code, 0);
+                       break;
+               case OP_LABEL:
+                       ins->inst_c0 = code - cfg->native_code;
+                       break;
+               case CEE_BR:
+                       //g_print ("target: %p, next: %p, curr: %p, last: %p\n", ins->inst_target_bb, bb->next_bb, ins, bb->last_ins);
+                       //if ((ins->inst_target_bb == bb->next_bb) && ins == bb->last_ins)
+                       //break;
+                       if (ins->flags & MONO_INST_BRLABEL) {
+                               /*if (ins->inst_i0->inst_c0) {
+                                       ppc_b (code, 0);
+                                       //x86_jump_code (code, cfg->native_code + ins->inst_i0->inst_c0);
+                               } else*/ {
+                                       mono_add_patch_info (cfg, offset, MONO_PATCH_INFO_LABEL, ins->inst_i0);
+                                       ppc_b (code, 0);
+                               }
+                       } else {
+                               /*if (ins->inst_target_bb->native_offset) {
+                                       ppc_b (code, 0);
+                                       //x86_jump_code (code, cfg->native_code + ins->inst_target_bb->native_offset); 
+                               } else*/ {
+                                       mono_add_patch_info (cfg, offset, MONO_PATCH_INFO_BB, ins->inst_target_bb);
+                                       ppc_b (code, 0);
+                               } 
+                       }
+                       break;
+               case OP_BR_REG:
+                       ppc_mtctr (code, ins->sreg1);
+                       ppc_bcctr (code, 20, 0);
+                       break;
+               case OP_CEQ:
+                       ppc_li (code, ins->dreg, 0);
+                       ppc_bc (code, PPC_BR_FALSE, PPC_BR_EQ, 2);
+                       ppc_li (code, ins->dreg, 1);
+                       break;
+               case OP_CLT:
+               case OP_CLT_UN:
+                       ppc_li (code, ins->dreg, 1);
+                       ppc_bc (code, PPC_BR_TRUE, PPC_BR_LT, 2);
+                       ppc_li (code, ins->dreg, 0);
+                       break;
+               case OP_CGT:
+               case OP_CGT_UN:
+                       ppc_li (code, ins->dreg, 1);
+                       ppc_bc (code, PPC_BR_TRUE, PPC_BR_LT, 2);
+                       ppc_li (code, ins->dreg, 0);
+                       break;
+               case OP_COND_EXC_EQ:
+               case OP_COND_EXC_NE_UN:
+               case OP_COND_EXC_LT:
+               case OP_COND_EXC_LT_UN:
+               case OP_COND_EXC_GT:
+               case OP_COND_EXC_GT_UN:
+               case OP_COND_EXC_GE:
+               case OP_COND_EXC_GE_UN:
+               case OP_COND_EXC_LE:
+               case OP_COND_EXC_LE_UN:
+               case OP_COND_EXC_OV:
+               case OP_COND_EXC_NO:
+               case OP_COND_EXC_C:
+               case OP_COND_EXC_NC:
+                       //EMIT_COND_SYSTEM_EXCEPTION (branch_cc_table [ins->opcode - OP_COND_EXC_EQ], 
+                       //                          (ins->opcode < OP_COND_EXC_NE_UN), ins->inst_p1);
+                       break;
+               case CEE_BEQ:
+               case CEE_BNE_UN:
+               case CEE_BLT:
+               case CEE_BLT_UN:
+               case CEE_BGT:
+               case CEE_BGT_UN:
+               case CEE_BGE:
+               case CEE_BGE_UN:
+               case CEE_BLE:
+               case CEE_BLE_UN:
+                       EMIT_COND_BRANCH (ins, ins->opcode - CEE_BEQ);
+                       break;
+
+               /* floating point opcodes */
+               case OP_R8CONST:
+                       ppc_load (code, ppc_r11, ins->inst_p0);
+                       ppc_lfd (code, ins->dreg, 0, ppc_r11);
+                       break;
+               case OP_R4CONST:
+                       ppc_load (code, ppc_r11, ins->inst_p0);
+                       ppc_lfs (code, ins->dreg, 0, ppc_r11);
+                       break;
+               case OP_STORER8_MEMBASE_REG:
+                       ppc_stfd (code, ins->sreg1, ins->inst_offset, ins->inst_destbasereg);
+                       break;
+               case OP_LOADR8_MEMBASE:
+                       ppc_lfd (code, ins->dreg, ins->inst_offset, ins->inst_basereg);
+                       break;
+               case OP_STORER4_MEMBASE_REG:
+                       ppc_stfs (code, ins->sreg1, ins->inst_offset, ins->inst_destbasereg);
+                       break;
+               case OP_LOADR4_MEMBASE:
+                       ppc_lfs (code, ins->dreg, ins->inst_offset, ins->inst_basereg);
+                       break;
+               case CEE_CONV_R4: /* FIXME: change precision */
+               case CEE_CONV_R8:
+                       g_assert_not_reached ();
+                       x86_push_reg (code, ins->sreg1);
+                       x86_fild_membase (code, X86_ESP, 0, FALSE);
+                       x86_alu_reg_imm (code, X86_ADD, X86_ESP, 4);
+                       break;
+               case OP_X86_FP_LOAD_I8:
+                       g_assert_not_reached ();
+                       x86_fild_membase (code, ins->inst_basereg, ins->inst_offset, TRUE);
+                       break;
+               case OP_X86_FP_LOAD_I4:
+                       g_assert_not_reached ();
+                       x86_fild_membase (code, ins->inst_basereg, ins->inst_offset, FALSE);
+                       break;
+               case OP_FCONV_TO_I1:
+                       g_assert_not_reached ();
+                       code = emit_float_to_int (cfg, code, ins->dreg, 1, TRUE);
+                       break;
+               case OP_FCONV_TO_U1:
+                       g_assert_not_reached ();
+                       code = emit_float_to_int (cfg, code, ins->dreg, 1, FALSE);
+                       break;
+               case OP_FCONV_TO_I2:
+                       g_assert_not_reached ();
+                       code = emit_float_to_int (cfg, code, ins->dreg, 2, TRUE);
+                       break;
+               case OP_FCONV_TO_U2:
+                       g_assert_not_reached ();
+                       code = emit_float_to_int (cfg, code, ins->dreg, 2, FALSE);
+                       break;
+               case OP_FCONV_TO_I4:
+               case OP_FCONV_TO_I:
+                       g_assert_not_reached ();
+                       code = emit_float_to_int (cfg, code, ins->dreg, 4, TRUE);
+                       break;
+               case OP_FCONV_TO_U4:
+               case OP_FCONV_TO_U:
+                       g_assert_not_reached ();
+                       code = emit_float_to_int (cfg, code, ins->dreg, 4, FALSE);
+                       break;
+               case OP_FCONV_TO_I8:
+               case OP_FCONV_TO_U8:
+                       g_assert_not_reached ();
+                       /*x86_alu_reg_imm (code, X86_SUB, X86_ESP, 4);
+                       x86_fnstcw_membase(code, X86_ESP, 0);
+                       x86_mov_reg_membase (code, ins->inst_dreg_low, X86_ESP, 0, 2);
+                       x86_alu_reg_imm (code, X86_OR, ins->inst_dreg_low, 0xc00);
+                       x86_mov_membase_reg (code, X86_ESP, 2, ins->inst_dreg_low, 2);
+                       x86_fldcw_membase (code, X86_ESP, 2);
+                       x86_alu_reg_imm (code, X86_SUB, X86_ESP, 8);
+                       x86_fist_pop_membase (code, X86_ESP, 0, TRUE);
+                       x86_pop_reg (code, ins->inst_dreg_low);
+                       x86_pop_reg (code, ins->inst_dreg_high);
+                       x86_fldcw_membase (code, X86_ESP, 0);
+                       x86_alu_reg_imm (code, X86_ADD, X86_ESP, 4);*/
+                       break;
+               case OP_LCONV_TO_R_UN: { 
+#if 0
+                       static guint8 mn[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0x3f, 0x40 };
+                       guint8 *br;
+
+                       /* load 64bit integer to FP stack */
+                       x86_push_imm (code, 0);
+                       x86_push_reg (code, ins->sreg2);
+                       x86_push_reg (code, ins->sreg1);
+                       x86_fild_membase (code, X86_ESP, 0, TRUE);
+                       /* store as 80bit FP value */
+                       x86_fst80_membase (code, X86_ESP, 0);
+                       
+                       /* test if lreg is negative */
+                       x86_test_reg_reg (code, ins->sreg2, ins->sreg2);
+                       br = code; x86_branch8 (code, X86_CC_GEZ, 0, TRUE);
+       
+                       /* add correction constant mn */
+                       x86_fld80_mem (code, mn);
+                       x86_fld80_membase (code, X86_ESP, 0);
+                       x86_fp_op_reg (code, X86_FADD, 1, TRUE);
+                       x86_fst80_membase (code, X86_ESP, 0);
+
+                       x86_patch (br, code);
+
+                       x86_fld80_membase (code, X86_ESP, 0);
+                       x86_alu_reg_imm (code, X86_ADD, X86_ESP, 12);
+#endif
+                       g_assert_not_reached ();
+                       break;
+               }
+               case OP_LCONV_TO_OVF_I: {
+#if 0
+                       guint8 *br [3], *label [1];
+
+                       /* 
+                        * Valid ints: 0xffffffff:8000000 to 00000000:0x7f000000
+                        */
+                       x86_test_reg_reg (code, ins->sreg1, ins->sreg1);
+
+                       /* If the low word top bit is set, see if we are negative */
+                       br [0] = code; x86_branch8 (code, X86_CC_LT, 0, TRUE);
+                       /* We are not negative (no top bit set, check for our top word to be zero */
+                       x86_test_reg_reg (code, ins->sreg2, ins->sreg2);
+                       br [1] = code; x86_branch8 (code, X86_CC_EQ, 0, TRUE);
+                       label [0] = code;
+
+                       /* throw exception */
+                       mono_add_patch_info (cfg, code - cfg->native_code, MONO_PATCH_INFO_EXC, "OverflowException");
+                       x86_jump32 (code, 0);
+       
+                       x86_patch (br [0], code);
+                       /* our top bit is set, check that top word is 0xfffffff */
+                       x86_alu_reg_imm (code, X86_CMP, ins->sreg2, 0xffffffff);
+               
+                       x86_patch (br [1], code);
+                       /* nope, emit exception */
+                       br [2] = code; x86_branch8 (code, X86_CC_NE, 0, TRUE);
+                       x86_patch (br [2], label [0]);
+
+                       if (ins->dreg != ins->sreg1)
+                               x86_mov_reg_reg (code, ins->dreg, ins->sreg1, 4);
+#endif
+                       g_assert_not_reached ();
+                       break;
+               }
+               case OP_FADD:
+                       ppc_fadd (code, ins->dreg, ins->sreg1, ins->sreg2);
+                       break;
+               case OP_FSUB:
+                       ppc_fsub (code, ins->dreg, ins->sreg1, ins->sreg2);
+                       break;          
+               case OP_FMUL:
+                       ppc_fmul (code, ins->dreg, ins->sreg1, ins->sreg2);
+                       break;          
+               case OP_FDIV:
+                       ppc_fdiv (code, ins->dreg, ins->sreg1, ins->sreg2);
+                       break;          
+               case OP_FNEG:
+                       ppc_fneg (code, ins->dreg, ins->sreg1);
+                       break;          
+               case OP_FREM:
+                       g_assert_not_reached ();
+                       break;
+               case OP_FCOMPARE:
+                       g_assert_not_reached ();
+                       /* this overwrites EAX */
+                       EMIT_FPCOMPARE(code);
+                       break;
+               case OP_FCEQ:
+                       g_assert_not_reached ();
+                       /*if (ins->dreg != X86_EAX) 
+                               x86_push_reg (code, X86_EAX);
+
+                       EMIT_FPCOMPARE(code);
+                       x86_alu_reg_imm (code, X86_CMP, X86_EAX, 0x4000);
+                       x86_set_reg (code, X86_CC_EQ, ins->dreg, TRUE);
+                       x86_widen_reg (code, ins->dreg, ins->dreg, FALSE, FALSE);
+
+                       if (ins->dreg != X86_EAX) 
+                               x86_pop_reg (code, X86_EAX);*/
+                       break;
+               case OP_FCLT:
+               case OP_FCLT_UN:
+                       g_assert_not_reached ();
+                       /*if (ins->dreg != X86_EAX) 
+                               x86_push_reg (code, X86_EAX);
+
+                       EMIT_FPCOMPARE(code);
+                       x86_set_reg (code, X86_CC_EQ, ins->dreg, TRUE);
+                       x86_widen_reg (code, ins->dreg, ins->dreg, FALSE, FALSE);
+
+                       if (ins->dreg != X86_EAX) 
+                               x86_pop_reg (code, X86_EAX);*/
+                       break;
+               case OP_FCGT:
+               case OP_FCGT_UN:
+                       g_assert_not_reached ();
+                       /*if (ins->dreg != X86_EAX) 
+                               x86_push_reg (code, X86_EAX);
+
+                       EMIT_FPCOMPARE(code);
+                       x86_alu_reg_imm (code, X86_CMP, X86_EAX, 0x0100);
+                       x86_set_reg (code, X86_CC_EQ, ins->dreg, TRUE);
+                       x86_widen_reg (code, ins->dreg, ins->dreg, FALSE, FALSE);
+
+                       if (ins->dreg != X86_EAX) 
+                               x86_pop_reg (code, X86_EAX);*/
+                       break;
+               case OP_FBEQ:
+                       g_assert_not_reached ();
+                       break;
+               case OP_FBNE_UN:
+                       g_assert_not_reached ();
+                       break;
+               case OP_FBLT:
+               case OP_FBLT_UN:
+                       g_assert_not_reached ();
+                       break;
+               case OP_FBGT:
+               case OP_FBGT_UN:
+                       g_assert_not_reached ();
+                       break;
+               case OP_FBGE:
+               case OP_FBGE_UN:
+                       g_assert_not_reached ();
+                       break;
+               case OP_FBLE:
+               case OP_FBLE_UN:
+                       g_assert_not_reached ();
+                       break;
+               case CEE_CKFINITE: {
+                       g_assert_not_reached ();
+                       x86_push_reg (code, X86_EAX);
+                       x86_fxam (code);
+                       x86_fnstsw (code);
+                       x86_alu_reg_imm (code, X86_AND, X86_EAX, 0x4100);
+                       x86_alu_reg_imm (code, X86_CMP, X86_EAX, 0x0100);
+                       x86_pop_reg (code, X86_EAX);
+                       EMIT_COND_SYSTEM_EXCEPTION (X86_CC_EQ, FALSE, "ArithmeticException");
+                       break;
+               }
+               default:
+                       g_warning ("unknown opcode %s in %s()\n", mono_inst_name (ins->opcode), __FUNCTION__);
+                       g_assert_not_reached ();
+               }
+
+               if ((cfg->opt & MONO_OPT_BRANCH) && ((code - cfg->native_code - offset) > max_len)) {
+                       g_warning ("wrong maximal instruction length of instruction %s (expected %d, got %d)",
+                                  mono_inst_name (ins->opcode), max_len, code - cfg->native_code - offset);
+                       g_assert_not_reached ();
+               }
+              
+               cpos += max_len;
+
+               last_ins = ins;
+               last_offset = offset;
+               
+               ins = ins->next;
+       }
+
+       cfg->code_len = code - cfg->native_code;
+}
+
+void
+mono_arch_register_lowlevel_calls (void)
+{
+       mono_register_jit_icall (enter_method, "mono_enter_method", NULL, TRUE);
+       mono_register_jit_icall (leave_method, "mono_leave_method", NULL, TRUE);
+}
+
+void
+mono_arch_patch_code (MonoMethod *method, MonoDomain *domain, guint8 *code, MonoJumpInfo *ji)
+{
+       MonoJumpInfo *patch_info;
+
+       for (patch_info = ji; patch_info; patch_info = patch_info->next) {
+               unsigned char *ip = patch_info->ip.i + code;
+               const unsigned char *target = NULL;
+
+               switch (patch_info->type) {
+               case MONO_PATCH_INFO_BB:
+                       target = patch_info->data.bb->native_offset + code;
+                       break;
+               case MONO_PATCH_INFO_ABS:
+                       target = patch_info->data.target;
+                       break;
+               case MONO_PATCH_INFO_LABEL:
+                       target = patch_info->data.inst->inst_c0 + code;
+                       break;
+               case MONO_PATCH_INFO_IP:
+                       *((gpointer *)(ip)) = ip;
+                       continue;
+               case MONO_PATCH_INFO_INTERNAL_METHOD: {
+                       MonoJitICallInfo *mi = mono_find_jit_icall_by_name (patch_info->data.name);
+                       if (!mi) {
+                               g_warning ("unknown MONO_PATCH_INFO_INTERNAL_METHOD %s", patch_info->data.name);
+                               g_assert_not_reached ();
+                       }
+                       target = mi->wrapper;
+                       break;
+               }
+               case MONO_PATCH_INFO_METHOD:
+                       if (patch_info->data.method == method) {
+                               target = code;
+                       } else {
+                               /* get the trampoline to the method from the domain */
+                               target = mono_arch_create_jit_trampoline (patch_info->data.method);
+                       }
+                       break;
+               case MONO_PATCH_INFO_SWITCH: {
+                       gpointer *table = (gpointer *)patch_info->data.target;
+                       int i;
+
+                       // FIXME: inspect code to get the register
+                       ppc_load (ip, ppc_r11, patch_info->data.target);
+                       //*((gconstpointer *)(ip + 2)) = patch_info->data.target;
+
+                       for (i = 0; i < patch_info->table_size; i++) {
+                               table [i] = (int)patch_info->data.table [i] + code;
+                       }
+                       /* we put into the table the absolute address, no need for ppc_patch in this case */
+                       continue;
+               }
+               case MONO_PATCH_INFO_METHODCONST:
+               case MONO_PATCH_INFO_CLASS:
+               case MONO_PATCH_INFO_IMAGE:
+               case MONO_PATCH_INFO_FIELD:
+                       g_assert_not_reached ();
+                       *((gconstpointer *)(ip + 1)) = patch_info->data.target;
+                       continue;
+               case MONO_PATCH_INFO_R4:
+               case MONO_PATCH_INFO_R8:
+                       g_assert_not_reached ();
+                       *((gconstpointer *)(ip + 2)) = patch_info->data.target;
+                       continue;
+               default:
+                       g_assert_not_reached ();
+               }
+               ppc_patch (ip, target);
+       }
+}
+
+int
+mono_arch_max_epilog_size (MonoCompile *cfg)
+{
+       int exc_count = 0, max_epilog_size = 16 + 20*4;
+       MonoJumpInfo *patch_info;
+       
+       if (cfg->method->save_lmf)
+               max_epilog_size += 128;
+       
+       if (mono_jit_trace_calls)
+               max_epilog_size += 50;
+
+       if (cfg->prof_options & MONO_PROFILE_ENTER_LEAVE)
+               max_epilog_size += 50;
+
+       /* count the number of exception infos */
+     
+       for (patch_info = cfg->patch_info; patch_info; patch_info = patch_info->next) {
+               if (patch_info->type == MONO_PATCH_INFO_EXC)
+                       exc_count++;
+       }
+
+       /* 
+        * make sure we have enough space for exceptions
+        * 16 is the size of two push_imm instructions and a call
+        */
+       max_epilog_size += exc_count*16;
+
+       return max_epilog_size;
+}
+
+guint8 *
+mono_arch_emit_prolog (MonoCompile *cfg)
+{
+       MonoMethod *method = cfg->method;
+       MonoBasicBlock *bb;
+       MonoMethodSignature *sig;
+       MonoInst *inst;
+       int alloc_size, pos, max_offset, i;
+       guint8 *code;
+       CallInfo *cinfo;
+
+       cfg->code_size = 256;
+       code = cfg->native_code = g_malloc (cfg->code_size);
+
+       if (1 || cfg->flags & MONO_CFG_HAS_CALLS) {
+               ppc_mflr (code, ppc_r0);
+               ppc_stw (code, ppc_r0, 8, ppc_sp);
+       }
+       if (cfg->flags & MONO_CFG_HAS_ALLOCA) {
+               cfg->used_int_regs |= 1 << 31;
+       }
+
+       alloc_size = cfg->stack_offset;
+       pos = 0;
+
+       if (method->save_lmf) {
+#if 0
+               pos += sizeof (MonoLMF);
+               
+               /* save the current IP */
+               mono_add_patch_info (cfg, code + 1 - cfg->native_code, MONO_PATCH_INFO_IP, NULL);
+               x86_push_imm (code, 0);
+
+               /* save all caller saved regs */
+               x86_push_reg (code, X86_EBX);
+               x86_push_reg (code, X86_EDI);
+               x86_push_reg (code, X86_ESI);
+               x86_push_reg (code, X86_EBP);
+
+               /* save method info */
+               x86_push_imm (code, method);
+       
+               /* get the address of lmf for the current thread */
+               mono_add_patch_info (cfg, code - cfg->native_code, MONO_PATCH_INFO_INTERNAL_METHOD, 
+                                    (gpointer)"get_lmf_addr");
+               x86_call_code (code, 0);
+
+               /* push lmf */
+               x86_push_reg (code, X86_EAX); 
+               /* push *lfm (previous_lmf) */
+               x86_push_membase (code, X86_EAX, 0);
+               /* *(lmf) = ESP */
+               x86_mov_membase_reg (code, X86_EAX, 0, X86_ESP, 4);
+#endif
+       } else {
+
+               for (i = 13; i < 32; ++i) {
+                       if (cfg->used_int_regs & (1 << i)) {
+                               pos += 4;
+                               ppc_stw (code, i, -pos, ppc_sp);
+                       }
+               }
+       }
+
+       alloc_size += pos;
+       // align to 16 bytes
+       if (alloc_size & (16 - 1))
+               alloc_size += 16 - (alloc_size & (16 - 1));
+
+       cfg->stack_usage = alloc_size;
+       if (alloc_size)
+               ppc_stwu (code, ppc_sp, -alloc_size, ppc_sp);
+       if (cfg->flags & MONO_CFG_HAS_ALLOCA)
+               ppc_mr (code, ppc_r31, ppc_sp);
+
+        /* compute max_offset in order to use short forward jumps */
+       max_offset = 0;
+       if (cfg->opt & MONO_OPT_BRANCH) {
+               for (bb = cfg->bb_entry; bb; bb = bb->next_bb) {
+                       MonoInst *ins = bb->code;
+                       bb->max_offset = max_offset;
+
+                       if (cfg->prof_options & MONO_PROFILE_COVERAGE)
+                               max_offset += 6; 
+
+                       while (ins) {
+                               max_offset += ((guint8 *)ins_spec [ins->opcode])[MONO_INST_LEN];
+                               ins = ins->next;
+                       }
+               }
+       }
+
+       if (mono_jit_trace_calls)
+               code = mono_arch_instrument_prolog (cfg, enter_method, code, TRUE);
+
+       /* load arguments allocated to register from the stack */
+       sig = method->signature;
+       pos = 0;
+
+       cinfo = calculate_sizes (sig, sig->pinvoke);
+
+       for (i = 0; i < sig->param_count + sig->hasthis; ++i) {
+               ArgInfo *ainfo = cinfo->args + i;
+               inst = cfg->varinfo [pos];
+               
+               if (inst->opcode == OP_REGVAR) {
+                       g_assert (!ainfo->regtype); // fine for now
+                       ppc_mr (code, inst->dreg, ainfo->reg);
+                       if (cfg->verbose_level > 2)
+                               g_print ("Argument %d assigned to register %s\n", pos, mono_arch_regname (inst->dreg));
+               } else {
+                       /* the argument should be put on the stack: FIXME handle size != word  */
+                       ppc_stw (code, ainfo->reg, inst->inst_offset, inst->inst_basereg);
+               }
+               pos++;
+       }
+
+       cfg->code_len = code - cfg->native_code;
+
+       return code;
+}
+
+void
+mono_arch_emit_epilog (MonoCompile *cfg)
+{
+       MonoJumpInfo *patch_info;
+       MonoMethod *method = cfg->method;
+       int pos, i;
+       guint8 *code;
+
+       code = cfg->native_code + cfg->code_len;
+
+       if (mono_jit_trace_calls)
+               code = mono_arch_instrument_epilog (cfg, leave_method, code, TRUE);
+
+       
+       pos = 0;
+       
+       if (method->save_lmf) {
+               pos = -sizeof (MonoLMF);
+       }
+
+       if (method->save_lmf) {
+#if 0
+               /* ebx = previous_lmf */
+               x86_pop_reg (code, X86_EBX);
+               /* edi = lmf */
+               x86_pop_reg (code, X86_EDI);
+               /* *(lmf) = previous_lmf */
+               x86_mov_membase_reg (code, X86_EDI, 0, X86_EBX, 4);
+
+               /* discard method info */
+               x86_pop_reg (code, X86_ESI);
+
+               /* restore caller saved regs */
+               x86_pop_reg (code, X86_EBP);
+               x86_pop_reg (code, X86_ESI);
+               x86_pop_reg (code, X86_EDI);
+               x86_pop_reg (code, X86_EBX);
+#endif
+       }
+
+       if (1 || cfg->flags & MONO_CFG_HAS_CALLS) {
+               ppc_lwz (code, ppc_r0, cfg->stack_usage + 8, cfg->frame_reg);
+               ppc_mtlr (code, ppc_r0);
+       }
+       ppc_addic (code, ppc_sp, cfg->frame_reg, cfg->stack_usage);
+       for (i = 13; i < 32; ++i) {
+               if (cfg->used_int_regs & (1 << i)) {
+                       pos += 4;
+                       ppc_lwz (code, i, -pos, cfg->frame_reg);
+               }
+       }
+       ppc_blr (code);
+
+       /* add code to raise exceptions */
+       for (patch_info = cfg->patch_info; patch_info; patch_info = patch_info->next) {
+               switch (patch_info->type) {
+               case MONO_PATCH_INFO_EXC:
+                       /*x86_patch (patch_info->ip.i + cfg->native_code, code);
+                       x86_push_imm (code, patch_info->data.target);
+                       x86_push_imm (code, patch_info->ip.i + cfg->native_code);
+                       patch_info->type = MONO_PATCH_INFO_INTERNAL_METHOD;
+                       patch_info->data.name = "throw_exception_by_name";
+                       patch_info->ip.i = code - cfg->native_code;
+                       x86_jump_code (code, 0);*/
+                       break;
+               default:
+                       /* do nothing */
+                       break;
+               }
+       }
+
+       cfg->code_len = code - cfg->native_code;
+
+       g_assert (cfg->code_len < cfg->code_size);
+
+}

diff --git a/mono/mini/mini-sparc.h b/mono/mini/mini-sparc.h
new file mode 100644 (file)
index 0000000..40b31f2
--- /dev/null
+++ b/mono/mini/mini-sparc.h
@@ -0,0 +1,26 @@
+#ifndef __MONO_MINI_SPARC_H__
+#define __MONO_MINI_SPARC_H__
+
+#include <mono/arch/sparc/sparc-codegen.h>
+
+/* Check this for Sparc.  I think it is right. */
+#define MONO_ARCH_FRAME_ALIGNMENT 4
+
+/* Also check this. */
+#define MONO_ARCH_CODE_ALIGNMENT 32
+
+/* BASEREG = Frame pointer
+ * RETREG? = Return register (but is it for caller or callee?)
+ */
+#define MONO_ARCH_BASEREG sparc_fp
+#define MONO_ARCH_RETREG1 sparc_i0
+
+struct MonoLMF {
+       gpointer    previous_lmf;
+       gpointer    lmf_addr;
+       MonoMethod *method;
+       guint32     ebp;
+       guint32     eip;
+};
+
+#endif /* __MONO_MINI_SPARC_H__ */  

diff --git a/mono/mini/tramp-sparc.c b/mono/mini/tramp-sparc.c
new file mode 100644 (file)
index 0000000..3ad741a
--- /dev/null
+++ b/mono/mini/tramp-sparc.c
@@ -0,0 +1,361 @@
+/*
+ * trampolinesparc.c: JIT trampoline code for Sparc 64
+ *
+ * Authors:
+ *   Mark Crichton (crichton@gimp.org)
+ *   Dietmar Maurer (dietmar@ximian.com)
+ *
+ * (C) 2003 Ximian, Inc.
+ */
+
+#include <config.h>
+#include <glib.h>
+
+#include <mono/arch/sparc/sparc-codegen.h>
+#include <mono/metadata/appdomain.h>
+#include <mono/metadata/marshal.h>
+#include <mono/metadata/tabledefs.h>
+#include <mono/metadata/mono-debug-debugger.h>
+
+#include "mini.h"
+#include "mini-sparc.h"
+
+#warning Not Sparc ready!  MEEP!
+
+/* adapt to mini later... */
+#define mono_jit_share_code (1)
+
+/*
+ * Address of the Sparc trampoline code.  This is used by the debugger to check
+ * whether a method is a trampoline.
+ */
+guint8 *mono_generic_trampoline_code = NULL;
+
+/*
+ * get_unbox_trampoline:
+ * @m: method pointer
+ * @addr: pointer to native code for @m
+ *
+ * when value type methods are called through the vtable we need to unbox the
+ * this argument. This method returns a pointer to a trampoline which does
+ * unboxing before calling the method
+ */
+static gpointer
+get_unbox_trampoline (MonoMethod *m, gpointer addr)
+{
+       guint8 *code, *start;
+       int this_pos = 4;
+
+       if (!m->signature->ret->byref && MONO_TYPE_ISSTRUCT (m->signature->ret))
+               this_pos = 8;
+           
+       start = code = g_malloc (16);
+
+       //x86_alu_membase_imm (code, X86_ADD, X86_ESP, this_pos, sizeof (MonoObject));
+       //x86_jump_code (code, addr);
+       g_assert ((code - start) < 16);
+
+       return start;
+}
+
+/**
+ * x86_magic_trampoline:
+ * @eax: saved x86 register 
+ * @ecx: saved x86 register 
+ * @edx: saved x86 register 
+ * @esi: saved x86 register 
+ * @edi: saved x86 register 
+ * @ebx: saved x86 register
+ * @code: pointer into caller code
+ * @method: the method to translate
+ *
+ * This method is called by the trampoline functions for virtual
+ * methods. It inspects the caller code to find the address of the
+ * vtable slot, then calls the JIT compiler and writes the address
+ * of the compiled method back to the vtable. All virtual methods 
+ * are called with: x86_call_membase (inst, basereg, disp). We always
+ * use 32 bit displacement to ensure that the length of the call 
+ * instruction is 6 bytes. We need to get the value of the basereg 
+ * and the constant displacement.
+ */
+static gpointer
+x86_magic_trampoline (int eax, int ecx, int edx, int esi, int edi, 
+                     int ebx, guint8 *code, MonoMethod *m)
+{
+       guint8 reg;
+       gint32 disp;
+       char *o;
+       gpointer addr;
+
+       EnterCriticalSection (metadata_section);
+       addr = mono_compile_method (m);
+       LeaveCriticalSection (metadata_section);
+       g_assert (addr);
+
+       /* the method was jumped to */
+       if (!code)
+               return addr;
+
+       /* go to the start of the call instruction
+        *
+        * address_byte = (m << 6) | (o << 3) | reg
+        * call opcode: 0xff address_byte displacement
+        * 0xff m=1,o=2 imm8
+        * 0xff m=2,o=2 imm32
+        */
+       code -= 6;
+       if ((code [1] != 0xe8) && (code [3] == 0xff) && ((code [4] & 0x18) == 0x10) && ((code [4] >> 6) == 1)) {
+               reg = code [4] & 0x07;
+               disp = (signed char)code [5];
+       } else {
+               if ((code [0] == 0xff) && ((code [1] & 0x18) == 0x10) && ((code [1] >> 6) == 2)) {
+                       reg = code [1] & 0x07;
+                       disp = *((gint32*)(code + 2));
+               } else if ((code [1] == 0xe8)) {
+                       *((guint32*)(code + 2)) = (guint)addr - ((guint)code + 1) - 5; 
+                       return addr;
+               } else if ((code [4] == 0xff) && (((code [5] >> 6) & 0x3) == 0) && (((code [5] >> 3) & 0x7) == 2)) {
+                       /*
+                        * This is a interface call: should check the above code can't catch it earlier 
+                        * 8b 40 30   mov    0x30(%eax),%eax
+                        * ff 10      call   *(%eax)
+                        */
+                       disp = 0;
+                       reg = code [5] & 0x07;
+               } else {
+                       printf ("Invalid trampoline sequence: %x %x %x %x %x %x %x\n", code [0], code [1], code [2], code [3],
+                               code [4], code [5], code [6]);
+                       g_assert_not_reached ();
+               }
+       }
+
+       o += disp;
+
+       if (m->klass->valuetype) {
+               return *((gpointer *)o) = get_unbox_trampoline (m, addr);
+       } else {
+               return *((gpointer *)o) = addr;
+       }
+}
+
+static guchar*
+create_trampoline_code (int is_jump)
+{
+       guint8 *buf, *code;
+       static guint8* generic_jump_trampoline = NULL;
+       
+       if (is_jump) {
+               if (generic_jump_trampoline)
+                       return generic_jump_trampoline;
+       } else {
+               if (mono_generic_trampoline_code)
+                       return mono_generic_trampoline_code;
+       }
+       
+       code = buf = g_malloc (256);
+       /* save caller save regs because we need to do a call */ 
+       //x86_push_reg (buf, X86_EDX);
+       //x86_push_reg (buf, X86_EAX);
+       //x86_push_reg (buf, X86_ECX);
+
+#if 0
+       /* save the IP (caller ip) */
+       if (is_jump)
+               x86_push_imm (buf, 0);
+       else
+               x86_push_membase (buf, X86_ESP, 16);
+
+       x86_push_reg (buf, X86_EBX);
+       x86_push_reg (buf, X86_EDI);
+       x86_push_reg (buf, X86_ESI);
+       x86_push_reg (buf, X86_EBP);
+
+       /* save method info */
+       x86_push_membase (buf, X86_ESP, 32);
+       /* get the address of lmf for the current thread */
+       x86_call_code (buf, mono_get_lmf_addr);
+       /* push lmf */
+       x86_push_reg (buf, X86_EAX); 
+       /* push *lfm (previous_lmf) */
+       x86_push_membase (buf, X86_EAX, 0);
+       /* *(lmf) = ESP */
+       x86_mov_membase_reg (buf, X86_EAX, 0, X86_ESP, 4);
+       /* save LFM end */
+
+       /* push the method info */
+       x86_push_membase (buf, X86_ESP, 44);
+       /* push the return address onto the stack */
+       if (is_jump)
+               x86_push_imm (buf, 0);
+       else
+               x86_push_membase (buf, X86_ESP, 52);
+
+       /* save all register values */
+       x86_push_reg (buf, X86_EBX);
+       x86_push_reg (buf, X86_EDI);
+       x86_push_reg (buf, X86_ESI);
+       x86_push_membase (buf, X86_ESP, 64); /* EDX */
+       x86_push_membase (buf, X86_ESP, 64); /* ECX */
+       x86_push_membase (buf, X86_ESP, 64); /* EAX */
+
+       x86_call_code (buf, x86_magic_trampoline);
+       x86_alu_reg_imm (buf, X86_ADD, X86_ESP, 8*4);
+
+       /* restore LMF start */
+       /* ebx = previous_lmf */
+       x86_pop_reg (buf, X86_EBX);
+       /* edi = lmf */
+       x86_pop_reg (buf, X86_EDI);
+       /* *(lmf) = previous_lmf */
+       x86_mov_membase_reg (buf, X86_EDI, 0, X86_EBX, 4);
+       /* discard method info */
+       x86_pop_reg (buf, X86_ESI);
+       /* restore caller saved regs */
+       x86_pop_reg (buf, X86_EBP);
+       x86_pop_reg (buf, X86_ESI);
+       x86_pop_reg (buf, X86_EDI);
+       x86_pop_reg (buf, X86_EBX);
+       /* discard save IP */
+       x86_alu_reg_imm (buf, X86_ADD, X86_ESP, 4);             
+       /* restore LMF end */
+
+       x86_alu_reg_imm (buf, X86_ADD, X86_ESP, 16);
+
+       /* call the compiled method */
+       x86_jump_reg (buf, X86_EAX);
+#endif
+
+       g_assert ((buf - code) <= 256);
+
+       if (is_jump) {
+               return generic_jump_trampoline = code;
+       } else {
+               return mono_generic_trampoline_code = code;
+       }
+}
+
+#define TRAMPOLINE_SIZE 10
+
+gpointer
+mono_arch_create_jump_trampoline (MonoMethod *method)
+{
+       guint8 *code, *buf, *tramp;
+
+       if (method->iflags & METHOD_IMPL_ATTRIBUTE_SYNCHRONIZED)
+               return mono_arch_create_jump_trampoline (mono_marshal_get_synchronized_wrapper (method));
+
+       /* icalls use method->addr */
+       if ((method->iflags & METHOD_IMPL_ATTRIBUTE_INTERNAL_CALL) ||
+           (method->flags & METHOD_ATTRIBUTE_PINVOKE_IMPL)) {
+               MonoMethod *nm;
+               
+               if (!method->addr && (method->flags & METHOD_ATTRIBUTE_PINVOKE_IMPL))
+                       mono_lookup_pinvoke_call (method);
+
+#ifdef MONO_USE_EXC_TABLES
+               if (mono_method_blittable (method)) {
+                       return method->addr;
+               } else {
+#endif
+                       nm = mono_marshal_get_native_wrapper (method);
+                       return mono_compile_method (nm);
+#ifdef MONO_USE_EXC_TABLES
+               }
+#endif
+       }
+       
+       tramp = create_trampoline_code (TRUE);
+
+       code = buf = g_malloc (TRAMPOLINE_SIZE);
+       //x86_push_imm (buf, method);
+       //x86_jump_code (buf, tramp);
+       g_assert ((buf - code) <= TRAMPOLINE_SIZE);
+
+       mono_jit_stats.method_trampolines++;
+
+       return code;
+
+}
+
+/**
+ * mono_arch_create_jit_trampoline:
+ * @method: pointer to the method info
+ *
+ * Creates a trampoline function for virtual methods. If the created
+ * code is called it first starts JIT compilation of method,
+ * and then calls the newly created method. I also replaces the
+ * corresponding vtable entry (see x86_magic_trampoline).
+ * 
+ * Returns: a pointer to the newly created code 
+ */
+gpointer
+mono_arch_create_jit_trampoline (MonoMethod *method)
+{
+       guint8 *code, *buf;
+
+       /* previously created trampoline code */
+       if (method->info)
+               return method->info;
+
+       /* we immediately compile runtime provided functions */
+       if (method->iflags & METHOD_IMPL_ATTRIBUTE_RUNTIME) {
+               method->info = mono_compile_method (method);
+               return method->info;
+       }
+
+       /* icalls use method->addr */
+       if ((method->iflags & METHOD_IMPL_ATTRIBUTE_INTERNAL_CALL) ||
+           (method->flags & METHOD_ATTRIBUTE_PINVOKE_IMPL)) {
+               MonoMethod *nm;
+               
+               if (!method->addr && (method->flags & METHOD_ATTRIBUTE_PINVOKE_IMPL))
+                       mono_lookup_pinvoke_call (method);
+
+#ifdef MONO_USE_EXC_TABLES
+               if (mono_method_blittable (method)) {
+                       method->info = method->addr;
+               } else {
+#endif
+                       nm = mono_marshal_get_native_wrapper (method);
+                       method->info = mono_compile_method (nm);
+#ifdef MONO_USE_EXC_TABLES
+               }
+#endif
+               return method->info;
+       }
+       
+       if (method->iflags & METHOD_IMPL_ATTRIBUTE_SYNCHRONIZED)
+               return mono_arch_create_jit_trampoline (mono_marshal_get_synchronized_wrapper (method));
+
+       create_trampoline_code (FALSE);
+
+       code = buf = g_malloc (TRAMPOLINE_SIZE);
+       //x86_push_imm (buf, method);
+       //x86_jump_code (buf, mono_generic_trampoline_code);
+       g_assert ((buf - code) <= TRAMPOLINE_SIZE);
+
+       /* store trampoline address */
+       method->info = code;
+
+       mono_jit_stats.method_trampolines++;
+
+       return code;
+}
+
+/*
+ * This method is only called when running in the Mono Debugger.
+ */
+gpointer
+mono_debugger_create_notification_function (gpointer *notification_address)
+{
+       guint8 *ptr, *buf;
+
+       ptr = buf = g_malloc0 (16);
+       //x86_breakpoint (buf);
+       if (notification_address)
+               *notification_address = buf;
+       //x86_ret (buf);
+
+       return ptr;
+}
+