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 4498 2006-02-12 23:43:09Z twisti $
44 #include "toolbox/logging.h"
45 #include "vm/global.h"
46 #include "vm/jit/stacktrace.h"
49 void docacheflush(u1 *p, long bytelen)
52 long psize = sysconf(_SC_PAGESIZE);
53 p -= (long) p & (psize - 1);
54 e += psize - ((((long) e - 1) & (psize - 1)) + 1);
56 mprotect(p, bytelen, PROT_READ | PROT_WRITE | PROT_EXEC);
60 /* md_stacktrace_get_returnaddress *********************************************
62 Returns the return address of the current stackframe, specified by
63 the passed stack pointer and the stack frame size.
65 *******************************************************************************/
67 u1 *md_stacktrace_get_returnaddress(u1 *sp, u4 framesize)
71 /* on MIPS the return address is located on the top of the stackframe */
73 /* XXX change this if we ever want to use 4-byte stackslots */
74 /* ra = *((u1 **) (sp + framesize - SIZEOF_VOID_P)); */
75 ra = *((u1 **) (sp + framesize - 8));
81 /* md_assembler_get_patch_address **********************************************
83 Gets the patch address of the currently compiled method. The offset
84 is extracted from the load instruction(s) before the jump and added
85 to the right base address (PV or REG_METHODPTR).
87 *******************************************************************************/
89 u1 *md_assembler_get_patch_address(u1 *ra, stackframeinfo *sfi, u1 *mptr)
95 /* go back to the actual load instruction (3 instructions on MIPS) */
99 /* get first instruction word on current PC */
101 mcode = *((u4 *) ra);
103 /* check if we have 2 instructions (lui) */
105 if ((mcode >> 16) == 0x3c19) {
106 /* XXX write a regression for this */
109 /* get displacement of first instruction (lui) */
111 offset = (s4) (mcode << 16);
113 /* get displacement of second instruction (daddiu) */
115 mcode = *((u4 *) (ra + 1 * 4));
117 assert((mcode >> 16) != 0x6739);
119 offset += (s2) (mcode & 0x0000ffff);
122 /* get first instruction (ld) */
124 mcode = *((u4 *) ra);
126 /* get the offset from the instruction */
128 offset = (s2) (mcode & 0x0000ffff);
130 /* check for call with REG_METHODPTR: ld s8,x(t9) */
132 #if SIZEOF_VOID_P == 8
133 if ((mcode >> 16) == 0xdf3e) {
135 if ((mcode >> 16) == 0x8f3e) {
137 /* in this case we use the passed method pointer */
142 /* in the normal case we check for a `ld s8,x(s8)' instruction */
144 #if SIZEOF_VOID_P == 8
145 assert((mcode >> 16) == 0xdfde);
147 assert((mcode >> 16) == 0x8fde);
150 /* and get the final data segment address */
152 pa = sfi->pv + offset;
160 /* md_codegen_findmethod *******************************************************
166 27feff9c addiu s8,ra,-100
168 *******************************************************************************/
170 u1 *md_codegen_findmethod(u1 *ra)
176 /* get the offset of the instructions */
178 /* get first instruction word after jump */
180 mcode = *((u4 *) ra);
182 /* check if we have 2 instructions (lui, daddiu) */
184 if ((mcode >> 16) == 0x3c19) {
185 /* get displacement of first instruction (lui) */
187 offset = (s4) (mcode << 16);
189 /* get displacement of second instruction (daddiu) */
191 mcode = *((u4 *) (ra + 1 * 4));
193 #if SIZEOF_VOID_P == 8
194 assert((mcode >> 16) == 0x6739);
196 assert((mcode >> 16) == 0x2739);
199 offset += (s2) (mcode & 0x0000ffff);
202 /* get offset of first instruction (daddiu) */
204 mcode = *((u4 *) ra);
206 #if SIZEOF_VOID_P == 8
207 assert((mcode >> 16) == 0x67fe);
209 assert((mcode >> 16) == 0x27fe);
212 offset = (s2) (mcode & 0x0000ffff);
215 /* calculate PV via RA + offset */
224 * These are local overrides for various environment variables in Emacs.
225 * Please do not remove this and leave it at the end of the file, where
226 * Emacs will automagically detect them.
227 * ---------------------------------------------------------------------
230 * indent-tabs-mode: t