1 /* src/vm/jit/m68k/md.c
3 Copyright (C) 1996-2005, 2006, 2007 R. Grafl, A. Krall, C. Kruegel,
4 C. Oates, R. Obermaisser, M. Platter, M. Probst, S. Ring,
5 E. Steiner, C. Thalinger, D. Thuernbeck, P. Tomsich, C. Ullrich,
6 J. Wenninger, Institut f. Computersprachen - TU Wien
8 This file is part of CACAO.
10 This program is free software; you can redistribute it and/or
11 modify it under the terms of the GNU General Public License as
12 published by the Free Software Foundation; either version 2, or (at
13 your option) any later version.
15 This program is distributed in the hope that it will be useful, but
16 WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
36 #include "vm/jit/codegen-common.h"
37 #include "vm/jit/md.h"
40 #include "vmcore/class.h"
41 #include "vmcore/linker.h"
42 #include "vmcore/method.h"
43 #include "mm/memory.h"
44 #include "vm/jit/asmpart.h"
48 * As a sanity measuremnt we assert the offset.h values in here as m68k gets
49 * crosscompiled for sure and noone thinks of offset.h wen changing compile flags
50 * and subtile bugs will result...
52 * m68k uses the trap instruction for hardware exceptions, need to register
53 * according signal handler
59 /* md_codegen_get_pv_from_pc ***************************************************
61 On this architecture just a wrapper function to
62 codegen_get_pv_from_pc.
64 *******************************************************************************/
65 u1* md_codegen_get_pv_from_pc(u1 *ra)
68 pv = codegen_get_pv_from_pc(ra);
73 /* md_jit_method_patch_address *************************************************
75 Gets the patch address of the currently compiled method. Has to be
76 extracted from the load instructions which lead to the jump.
78 from asmpart.S (asm_vm_call_method):
79 84: 2879 0000 0000 moveal 0 <asm_vm_call_method-0x34>,%a4
83 from invokestatic / invokespecial
84 0x40290882: 247c 4029 03b4 moveal #1076429748,%a2
85 0x40290888: 4e92 jsr %a2@
88 0x40297eca: 266a 0000 moveal %a2@(0),%a3
89 0x40297ece: 246b 002c moveal %a3@(44),%a2
90 0x40297ed2: 4e92 jsr %a2@
94 *******************************************************************************/
96 void *md_jit_method_patch_address(void *pv, void *ra, void *mptr)
104 if (*((u2*)(pc - 2)) == 0x4e94) { /* jsr %a4@ */
105 if (*((u2*)(pc - 6)) == 0x286b) {
106 /* found an invokevirtual */
107 /* get offset of load instruction 246b XXXX */
108 disp = *((s2*)(pc - 4));
110 /* return NULL if no mptr was specified (used for replacement) */
115 pa = ((uint8_t *) mptr) + disp;/* mptr contains the magic we want */
117 /* we had a moveal XXX, %a3 which is a 3 word opcode */
119 assert(*(u2*)(pc - 8) == 0x2879); /* moveal */
120 pa = (void*)*((u4*)(pc - 6)); /* another indirection ! */
122 } else if (*((u2*)(pc - 2)) == 0x4e92) { /* jsr %a2@ */
123 if (*(u2*)(pc - 8) == 0x247c) {
124 /* found a invokestatic/invokespecial */
125 pa = ((u4*)(pc - 6)); /* no indirection ! */
136 /* XXX i can't find a definition of cacheflush in any installed header files but i can find the symbol in libc */
137 /* lets extract the signature from the assembler code*/
139 000e7158 <cacheflush>:
140 e7158: 707b moveq #123,%d0
141 e715a: 2f04 movel %d4,%sp@-
142 e715c: 282f 0014 movel %sp@(20),%d4 arg
143 e7160: 2243 moveal %d3,%a1
144 e7162: 262f 0010 movel %sp@(16),%d3 arg
145 e7166: 2042 moveal %d2,%a0
146 e7168: 242f 000c movel %sp@(12),%d2 arg
147 e716c: 222f 0008 movel %sp@(8),%d1 arg
148 e7170: 4e40 trap #0 traps into system i guess
149 e7172: 2408 movel %a0,%d2
150 e7174: 2609 movel %a1,%d3
151 e7176: 281f movel %sp@+,%d4
152 e7178: 223c ffff f001 movel #-4095,%d1
153 e717e: b081 cmpl %d1,%d0
154 e7180: 6402 bccs e7184 <cacheflush+0x2c>
157 e7186: 2f00 movel %d0,%sp@-
158 e7188: 61ff fff3 82e2 bsrl 1f46c <D_MAX_EXP+0x1ec6d>
159 e718e: 209f movel %sp@+,%a0@
160 e7190: 70ff moveq #-1,%d0
161 e7192: 2040 moveal %d0,%a0
166 /* seems to have 4 arguments */
167 /* best guess: it is this syscall */
168 /* asmlinkage int sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len) */
169 /* kernel 2.6.10 with freescale patches (the one I develop against) needs a patch of */
170 /* arch/m68k/kernel/sys_m68k.c(sys_cacheflush) */
173 void DcacheFlushInvalidateCacheBlock(void *start, unsigned long size);
174 void IcacheInvalidateCacheBlock(void *start, unsigned long size);
177 sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len)
180 DcacheFlushInvalidateCacheBlock(addr, len);
181 IcacheInvalidateCacheBlock(addr, len);
186 extern int cacheflush(unsigned long addr, int scope, int cache, unsigned long len);
188 #include "asm/cachectl.h" /* found more traces of the cacheflush function */
191 void md_cacheflush(u1 *addr, s4 nbytes) { cacheflush((unsigned long)addr, FLUSH_SCOPE_PAGE, FLUSH_CACHE_BOTH, nbytes); }
192 void md_dcacheflush(u1 *addr, s4 nbytes) { cacheflush((unsigned long)addr, FLUSH_SCOPE_PAGE, FLUSH_CACHE_DATA, nbytes); }
193 void md_icacheflush(u1* addr, s4 nbytes) { cacheflush((unsigned long)addr, FLUSH_SCOPE_LINE, FLUSH_CACHE_INSN, nbytes); }
195 /* md_stacktrace_get_returnaddress *********************************************
197 Returns the return address of the current stackframe, specified by
198 the passed stack pointer and the stack frame size.
200 *******************************************************************************/
201 u1* md_stacktrace_get_returnaddress(u1* sp, u4 framesize)
203 /* return address is above stackpointer */
204 u1 *ra = *((u1**)(sp + framesize));
206 /* XXX: This helps for now, but it's a ugly hack
207 * the problem _may_ be: the link instruction is used
208 * by some gcc generated code, and we get an additional word
209 * on the stack, the old framepointer. Its address is somewhere
210 * near sp, but that all depends the code generated by the compiler.
211 * I'm unsure about a clean solution.
214 if (!(ra > 0x40000000 && ra < 0x80000000)) {
215 ra = *((u1**)(sp + framesize + 4));
218 /* assert(ra > 0x40000000 && ra < 0x80000000);
219 printf("XXXXXX=%x\n", ra);
226 * These are local overrides for various environment variables in Emacs.
227 * Please do not remove this and leave it at the end of the file, where
228 * Emacs will automagically detect them.
229 * ---------------------------------------------------------------------
232 * indent-tabs-mode: t
236 * vim:noexpandtab:sw=4:ts=4: