1 /* src/vm/jit/alpha/md.c - machine dependent Alpha functions
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
25 $Id: md.c 8247 2007-07-31 12:06:44Z michi $
35 #if defined(__LINUX__)
38 extern unsigned long ieee_get_fp_control();
39 extern void ieee_set_fp_control(unsigned long fp_control);
44 #include "vm/jit/alpha/md-abi.h"
46 #include "vm/exceptions.h"
47 #include "vm/stringlocal.h"
49 #include "vm/jit/asmpart.h"
50 #include "vm/jit/stacktrace.h"
52 #if !defined(NDEBUG) && defined(ENABLE_DISASSEMBLER)
53 #include "vmcore/options.h" /* XXX debug */
54 #include "vm/jit/disass.h" /* XXX debug */
58 /* global variables ***********************************************************/
60 bool has_ext_instr_set = false; /* has instruction set extensions */
63 /* md_init *********************************************************************
65 Do some machine dependent initialization.
67 *******************************************************************************/
71 /* check for extended instruction set */
73 has_ext_instr_set = !asm_md_init();
75 #if defined(__LINUX__)
76 /* Linux on Digital Alpha needs an initialisation of the ieee
77 floating point control for IEEE compliant arithmetic (option
78 -mieee of GCC). Under Digital Unix this is done
81 /* initialize floating point control */
83 ieee_set_fp_control(ieee_get_fp_control()
84 & ~IEEE_TRAP_ENABLE_INV
85 & ~IEEE_TRAP_ENABLE_DZE
86 /* & ~IEEE_TRAP_ENABLE_UNF we dont want underflow */
87 & ~IEEE_TRAP_ENABLE_OVF);
92 /* md_stacktrace_get_returnaddress *********************************************
94 Returns the return address of the current stackframe, specified by
95 the passed stack pointer and the stack frame size.
97 *******************************************************************************/
99 u1 *md_stacktrace_get_returnaddress(u1 *sp, u4 framesize)
103 /* on Alpha the return address is located on the top of the stackframe */
105 ra = *((u1 **) (sp + framesize - SIZEOF_VOID_P));
111 /* md_get_method_patch_address *************************************************
113 Gets the patch address of the currently compiled method. The offset
114 is extracted from the load instruction(s) before the jump and added
115 to the right base address (PV or REG_METHODPTR).
117 INVOKESTATIC/SPECIAL:
119 a77bffb8 ldq pv,-72(pv)
124 a7900000 ldq at,0(a0)
125 a77c0000 ldq pv,0(at)
130 a7900000 ldq at,0(a0)
131 a79cff98 ldq at,-104(at)
132 a77c0018 ldq pv,24(at)
135 *******************************************************************************/
137 u1 *md_get_method_patch_address(u1 *ra, stackframeinfo *sfi, u1 *mptr)
141 u1 *pa; /* patch address */
143 /* go back to the actual load instruction (2 instructions on Alpha) */
147 /* get first instruction word on current PC */
149 mcode = *((u4 *) ra);
151 /* check if we have 2 instructions (lui) */
153 if ((mcode >> 16) == 0x3c19) {
154 /* XXX write a regression for this */
157 /* get displacement of first instruction (lui) */
159 offset = (s4) (mcode << 16);
161 /* get displacement of second instruction (daddiu) */
163 mcode = *((u4 *) (ra + 1 * 4));
165 assert((mcode >> 16) == 0x6739);
167 offset += (s2) (mcode & 0x0000ffff);
170 /* get first instruction (ldq) */
172 mcode = *((u4 *) ra);
174 /* get the offset from the instruction */
176 offset = (s2) (mcode & 0x0000ffff);
178 /* check for call with REG_METHODPTR: ldq pv,0(at) */
180 if ((mcode >> 16) == 0xa77c) {
181 /* in this case we use the passed method pointer */
183 /* return NULL if no mptr was specified (used for replacement) */
191 /* in the normal case we check for a `ldq pv,-72(pv)' instruction */
193 assert((mcode >> 16) == 0xa77b);
195 /* and get the final data segment address */
197 pa = sfi->pv + offset;
205 /* md_codegen_get_pv_from_pc ***************************************************
210 277afffe ldah pv,-2(ra)
211 237ba61c lda pv,-23012(pv)
213 *******************************************************************************/
215 u1 *md_codegen_get_pv_from_pc(u1 *ra)
223 /* get first instruction word after jump */
225 mcode = *((u4 *) ra);
227 /* check if we have 2 instructions (ldah, lda) */
229 if ((mcode >> 16) == 0x277a) {
230 /* get displacement of first instruction (ldah) */
232 offset = (s4) (mcode << 16);
235 /* get displacement of second instruction (lda) */
237 mcode = *((u4 *) (ra + 1 * 4));
239 assert((mcode >> 16) == 0x237b);
241 offset = (s2) (mcode & 0x0000ffff);
245 /* get displacement of first instruction (lda) */
247 assert((mcode >> 16) == 0x237a);
249 offset = (s2) (mcode & 0x0000ffff);
257 /* md_cacheflush ***************************************************************
259 Calls the system's function to flush the instruction and data
262 *******************************************************************************/
264 void md_cacheflush(u1 *addr, s4 nbytes)
266 asm_cacheflush(addr, nbytes);
270 /* md_icacheflush **************************************************************
272 Calls the system's function to flush the instruction cache.
274 *******************************************************************************/
276 void md_icacheflush(u1 *addr, s4 nbytes)
278 asm_cacheflush(addr, nbytes);
282 /* md_patch_replacement_point **************************************************
284 Patch the given replacement point.
286 *******************************************************************************/
288 #if defined(ENABLE_REPLACEMENT)
289 void md_patch_replacement_point(codeinfo *code, s4 index, rplpoint *rp, u1 *savedmcode)
294 /* restore the patched-over instruction */
295 *(u4*)(rp->pc) = *(u4*)(savedmcode);
298 /* save the current machine code */
299 *(u4*)(savedmcode) = *(u4*)(rp->pc);
301 /* build the machine code for the patch */
302 mcode = (0xa41f0000 | (EXCEPTION_HARDWARE_PATCHER));
304 /* write the new machine code */
305 *(u4*)(rp->pc) = mcode;
308 #if !defined(NDEBUG) && defined(ENABLE_DISASSEMBLER) && 0
316 /* flush instruction cache */
317 md_icacheflush(rp->pc,4);
319 #endif /* defined(ENABLE_REPLACEMENT) */
323 * These are local overrides for various environment variables in Emacs.
324 * Please do not remove this and leave it at the end of the file, where
325 * Emacs will automagically detect them.
326 * ---------------------------------------------------------------------
329 * indent-tabs-mode: t
333 * vim:noexpandtab:sw=4:ts=4: