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
31 $Id: md.c 4640 2006-03-16 17:24:18Z twisti $
40 #include <sys/cachectl.h>
45 #include "toolbox/logging.h"
46 #include "vm/global.h"
47 #include "vm/jit/stacktrace.h"
50 void docacheflush(u1 *p, long bytelen)
53 long psize = sysconf(_SC_PAGESIZE);
54 p -= (long) p & (psize - 1);
55 e += psize - ((((long) e - 1) & (psize - 1)) + 1);
57 mprotect(p, bytelen, PROT_READ | PROT_WRITE | PROT_EXEC);
61 /* md_stacktrace_get_returnaddress *********************************************
63 Returns the return address of the current stackframe, specified by
64 the passed stack pointer and the stack frame size.
66 *******************************************************************************/
68 u1 *md_stacktrace_get_returnaddress(u1 *sp, u4 framesize)
72 /* on MIPS the return address is located on the top of the stackframe */
74 /* XXX change this if we ever want to use 4-byte stackslots */
75 /* ra = *((u1 **) (sp + framesize - SIZEOF_VOID_P)); */
76 ra = *((u1 **) (sp + framesize - 8));
82 /* md_assembler_get_patch_address **********************************************
84 Gets the patch address of the currently compiled method. The offset
85 is extracted from the load instruction(s) before the jump and added
86 to the right base address (PV or REG_METHODPTR).
88 *******************************************************************************/
90 u1 *md_assembler_get_patch_address(u1 *ra, stackframeinfo *sfi, u1 *mptr)
96 /* go back to the actual load instruction (3 instructions on MIPS) */
100 /* get first instruction word on current PC */
102 mcode = *((u4 *) ra);
104 /* check if we have 2 instructions (lui) */
106 if ((mcode >> 16) == 0x3c19) {
107 /* XXX write a regression for this */
110 /* get displacement of first instruction (lui) */
112 offset = (s4) (mcode << 16);
114 /* get displacement of second instruction (daddiu) */
116 mcode = *((u4 *) (ra + 1 * 4));
118 assert((mcode >> 16) != 0x6739);
120 offset += (s2) (mcode & 0x0000ffff);
123 /* get first instruction (ld) */
125 mcode = *((u4 *) ra);
127 /* get the offset from the instruction */
129 offset = (s2) (mcode & 0x0000ffff);
131 /* check for call with REG_METHODPTR: ld s8,x(t9) */
133 #if SIZEOF_VOID_P == 8
134 if ((mcode >> 16) == 0xdf3e) {
136 if ((mcode >> 16) == 0x8f3e) {
138 /* in this case we use the passed method pointer */
143 /* in the normal case we check for a `ld s8,x(s8)' instruction */
145 #if SIZEOF_VOID_P == 8
146 assert((mcode >> 16) == 0xdfde);
148 assert((mcode >> 16) == 0x8fde);
151 /* and get the final data segment address */
153 pa = sfi->pv + offset;
161 /* md_codegen_findmethod *******************************************************
167 27feff9c addiu s8,ra,-100
169 *******************************************************************************/
171 u1 *md_codegen_findmethod(u1 *ra)
177 /* get the offset of the instructions */
179 /* get first instruction word after jump */
181 mcode = *((u4 *) ra);
183 /* check if we have 2 instructions (lui, daddiu) */
185 if ((mcode >> 16) == 0x3c19) {
186 /* get displacement of first instruction (lui) */
188 offset = (s4) (mcode << 16);
190 /* get displacement of second instruction (daddiu) */
192 mcode = *((u4 *) (ra + 1 * 4));
194 #if SIZEOF_VOID_P == 8
195 assert((mcode >> 16) == 0x6739);
197 assert((mcode >> 16) == 0x2739);
200 offset += (s2) (mcode & 0x0000ffff);
203 /* get offset of first instruction (daddiu) */
205 mcode = *((u4 *) ra);
207 #if SIZEOF_VOID_P == 8
208 assert((mcode >> 16) == 0x67fe);
210 assert((mcode >> 16) == 0x27fe);
213 offset = (s2) (mcode & 0x0000ffff);
216 /* calculate PV via RA + offset */
224 /* md_cacheflush ***************************************************************
226 Calls the system's function to flush the instruction and data
229 *******************************************************************************/
231 void md_cacheflush(u1 *addr, s4 nbytes)
233 cacheflush(addr, nbytes, BCACHE);
237 /* md_icacheflush **************************************************************
239 Calls the system's function to flush the instruction cache.
241 *******************************************************************************/
243 void md_icacheflush(u1 *addr, s4 nbytes)
245 cacheflush(addr, nbytes, ICACHE);
249 /* md_dcacheflush **************************************************************
251 Calls the system's function to flush the data cache.
253 *******************************************************************************/
255 void md_dcacheflush(u1 *addr, s4 nbytes)
257 cacheflush(addr, nbytes, DCACHE);
262 * These are local overrides for various environment variables in Emacs.
263 * Please do not remove this and leave it at the end of the file, where
264 * Emacs will automagically detect them.
265 * ---------------------------------------------------------------------
268 * indent-tabs-mode: t