1 /* src/vm/jit/mips/md.c - machine dependent MIPS functions
3 Copyright (C) 1996-2005, 2006 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 Contact: cacao@cacaojvm.org
27 Authors: Christian Thalinger
29 Changes: Edwin Steiner
31 $Id: md.c 4654 2006-03-19 19:46:11Z edwin $
40 #include <sys/cachectl.h>
45 #include "toolbox/logging.h"
46 #include "vm/global.h"
47 #include "vm/jit/stacktrace.h"
48 #include "vm/options.h" /* XXX debug */
49 #include "vm/jit/disass.h" /* XXX debug */
52 void docacheflush(u1 *p, long bytelen)
55 long psize = sysconf(_SC_PAGESIZE);
56 p -= (long) p & (psize - 1);
57 e += psize - ((((long) e - 1) & (psize - 1)) + 1);
59 mprotect(p, bytelen, PROT_READ | PROT_WRITE | PROT_EXEC);
63 /* md_stacktrace_get_returnaddress *********************************************
65 Returns the return address of the current stackframe, specified by
66 the passed stack pointer and the stack frame size.
68 *******************************************************************************/
70 u1 *md_stacktrace_get_returnaddress(u1 *sp, u4 framesize)
74 /* on MIPS the return address is located on the top of the stackframe */
76 /* XXX change this if we ever want to use 4-byte stackslots */
77 /* ra = *((u1 **) (sp + framesize - SIZEOF_VOID_P)); */
78 ra = *((u1 **) (sp + framesize - 8));
84 /* md_assembler_get_patch_address **********************************************
86 Gets the patch address of the currently compiled method. The offset
87 is extracted from the load instruction(s) before the jump and added
88 to the right base address (PV or REG_METHODPTR).
90 *******************************************************************************/
92 u1 *md_assembler_get_patch_address(u1 *ra, stackframeinfo *sfi, u1 *mptr)
98 /* go back to the actual load instruction (3 instructions on MIPS) */
102 /* get first instruction word on current PC */
104 mcode = *((u4 *) ra);
106 /* check if we have 2 instructions (lui) */
108 if ((mcode >> 16) == 0x3c19) {
109 /* XXX write a regression for this */
112 /* get displacement of first instruction (lui) */
114 offset = (s4) (mcode << 16);
116 /* get displacement of second instruction (daddiu) */
118 mcode = *((u4 *) (ra + 1 * 4));
120 assert((mcode >> 16) != 0x6739);
122 offset += (s2) (mcode & 0x0000ffff);
125 /* get first instruction (ld) */
127 mcode = *((u4 *) ra);
129 /* get the offset from the instruction */
131 offset = (s2) (mcode & 0x0000ffff);
133 /* check for call with REG_METHODPTR: ld s8,x(t9) */
135 #if SIZEOF_VOID_P == 8
136 if ((mcode >> 16) == 0xdf3e) {
138 if ((mcode >> 16) == 0x8f3e) {
140 /* in this case we use the passed method pointer */
145 /* in the normal case we check for a `ld s8,x(s8)' instruction */
147 #if SIZEOF_VOID_P == 8
148 assert((mcode >> 16) == 0xdfde);
150 assert((mcode >> 16) == 0x8fde);
153 /* and get the final data segment address */
155 pa = sfi->pv + offset;
163 /* md_codegen_findmethod *******************************************************
169 27feff9c addiu s8,ra,-100
171 *******************************************************************************/
173 u1 *md_codegen_findmethod(u1 *ra)
179 /* get the offset of the instructions */
181 /* get first instruction word after jump */
183 mcode = *((u4 *) ra);
185 /* check if we have 2 instructions (lui, daddiu) */
187 if ((mcode >> 16) == 0x3c19) {
188 /* get displacement of first instruction (lui) */
190 offset = (s4) (mcode << 16);
192 /* get displacement of second instruction (daddiu) */
194 mcode = *((u4 *) (ra + 1 * 4));
196 #if SIZEOF_VOID_P == 8
197 assert((mcode >> 16) == 0x6739);
199 assert((mcode >> 16) == 0x2739);
202 offset += (s2) (mcode & 0x0000ffff);
205 /* get offset of first instruction (daddiu) */
207 mcode = *((u4 *) ra);
209 #if SIZEOF_VOID_P == 8
210 assert((mcode >> 16) == 0x67fe);
212 assert((mcode >> 16) == 0x27fe);
215 offset = (s2) (mcode & 0x0000ffff);
218 /* calculate PV via RA + offset */
226 /* md_cacheflush ***************************************************************
228 Calls the system's function to flush the instruction and data
231 *******************************************************************************/
233 void md_cacheflush(u1 *addr, s4 nbytes)
235 cacheflush(addr, nbytes, BCACHE);
239 /* md_icacheflush **************************************************************
241 Calls the system's function to flush the instruction cache.
243 *******************************************************************************/
245 void md_icacheflush(u1 *addr, s4 nbytes)
247 cacheflush(addr, nbytes, ICACHE);
251 /* md_dcacheflush **************************************************************
253 Calls the system's function to flush the data cache.
255 *******************************************************************************/
257 void md_dcacheflush(u1 *addr, s4 nbytes)
259 cacheflush(addr, nbytes, DCACHE);
263 /* md_patch_replacement_point **************************************************
265 Patch the given replacement point.
267 *******************************************************************************/
269 void md_patch_replacement_point(rplpoint *rp)
273 /* save the current machine code */
274 mcode = *(u8*)rp->pc;
276 /* write the new machine code */
277 *(u8*)(rp->pc) = rp->mcode;
279 /* store saved mcode */
289 /* flush instruction cache */
290 md_icacheflush(rp->pc,2*4);
294 * These are local overrides for various environment variables in Emacs.
295 * Please do not remove this and leave it at the end of the file, where
296 * Emacs will automagically detect them.
297 * ---------------------------------------------------------------------
300 * indent-tabs-mode: t
304 * vim:noexpandtab:sw=4:ts=4: