1 /* src/vm/jit/powerpc/md.c - machine dependent PowerPC 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 7596 2007-03-28 21:05:53Z twisti $
37 #include "vm/jit/powerpc/codegen.h"
39 #include "vm/global.h"
41 #include "vm/jit/asmpart.h"
42 #include "vm/jit/stacktrace.h"
44 #if !defined(NDEBUG) && defined(ENABLE_DISASSEMBLER)
45 # include "vm/jit/disass.h" /* XXX debug */
46 # include "vmcore/options.h" /* XXX debug */
50 /* md_init *********************************************************************
52 Do some machine dependent initialization.
54 *******************************************************************************/
62 /* md_stacktrace_get_returnaddress *********************************************
64 Returns the return address of the current stackframe, specified by
65 the passed stack pointer and the stack frame size.
67 *******************************************************************************/
69 u1 *md_stacktrace_get_returnaddress(u1 *sp, u4 framesize)
73 /* on PowerPC the return address is located in the linkage area */
75 ra = *((u1 **) (sp + framesize + LA_LR_OFFSET));
81 /* md_get_method_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).
89 81adffd4 lwz r13,-44(r13)
95 81830000 lwz r12,0(r3)
96 81ac0000 lwz r13,0(r12)
102 81830000 lwz r12,0(r3)
103 818c0000 lwz r12,0(r12)
104 81ac0000 lwz r13,0(r12)
108 *******************************************************************************/
110 u1 *md_get_method_patch_address(u1 *ra, stackframeinfo *sfi, u1 *mptr)
116 /* go back to the actual load instruction (3 instructions) */
120 /* get first instruction word (lwz) */
122 mcode = *((u4 *) ra);
124 /* check if we have 2 instructions (addis, addi) */
126 if ((mcode >> 16) == 0x3c19) {
127 /* XXX write a regression for this */
130 /* get displacement of first instruction (addis) */
132 offset = (s4) (mcode << 16);
134 /* get displacement of second instruction (addi) */
136 mcode = *((u4 *) (ra + 1 * 4));
138 assert((mcode >> 16) != 0x6739);
140 offset += (s2) (mcode & 0x0000ffff);
143 /* get the offset from the instruction */
145 offset = (s2) (mcode & 0x0000ffff);
147 /* check for load from PV */
149 if ((mcode >> 16) == 0x81ad) {
150 /* get the final data segment address */
152 pa = sfi->pv + offset;
154 } else if ((mcode >> 16) == 0x81ac) {
155 /* in this case we use the passed method pointer */
157 /* return NULL if no mptr was specified (used for replacement) */
165 /* catch any problems */
175 /* md_codegen_get_pv_from_pc ***************************************************
180 39abffe0 addi r13,r11,-32
185 3dabffff addis r13,r11,-1
186 39ad68b0 addi r13,r13,26800
188 *******************************************************************************/
190 u1 *md_codegen_get_pv_from_pc(u1 *ra)
196 /* get first instruction word after jump */
198 mcode = *((u4 *) (ra + 1 * 4));
200 /* check if we have 2 instructions (addis, addi) */
202 if ((mcode >> 16) == 0x3dab) {
203 /* get displacement of first instruction (addis) */
205 offset = (s4) (mcode << 16);
207 /* get displacement of second instruction (addi) */
209 mcode = *((u4 *) (ra + 2 * 4));
211 /* check for addi instruction */
213 assert((mcode >> 16) == 0x39ad);
215 offset += (s2) (mcode & 0x0000ffff);
218 /* check for addi instruction */
220 assert((mcode >> 16) == 0x39ab);
222 /* get offset of first instruction (addi) */
224 offset = (s2) (mcode & 0x0000ffff);
227 /* calculate PV via RA + offset */
235 /* md_cacheflush ***************************************************************
237 Calls the system's function to flush the instruction and data
240 *******************************************************************************/
242 void md_cacheflush(u1 *addr, s4 nbytes)
244 asm_cacheflush(addr, nbytes);
248 /* md_icacheflush **************************************************************
250 Calls the system's function to flush the instruction cache.
252 *******************************************************************************/
254 void md_icacheflush(u1 *addr, s4 nbytes)
256 asm_cacheflush(addr, nbytes);
260 /* md_dcacheflush **************************************************************
262 Calls the system's function to flush the data cache.
264 *******************************************************************************/
266 void md_dcacheflush(u1 *addr, s4 nbytes)
268 asm_cacheflush(addr, nbytes);
272 /* md_patch_replacement_point **************************************************
274 Patch the given replacement point.
276 *******************************************************************************/
278 #if defined(ENABLE_REPLACEMENT)
279 void md_patch_replacement_point(codeinfo *code, s4 index, rplpoint *rp, u1 *savedmcode)
285 /* restore the patched-over instruction */
286 *(u4*)(rp->pc) = *(u4*)(savedmcode);
289 /* save the current machine code */
290 *(u4*)(savedmcode) = *(u4*)(rp->pc);
292 /* build the machine code for the patch */
293 disp = ((u4*)code->replacementstubs - (u4*)rp->pc)
294 + index * REPLACEMENT_STUB_SIZE
297 mcode = (18 << 26) | ((((disp) * 4) + 4) & M_BMASK);
299 /* write the new machine code */
300 *(u4*)(rp->pc) = (u4) mcode;
303 #if !defined(NDEBUG) && defined(ENABLE_DISASSEMBLER) && 0
311 /* flush instruction cache */
312 md_icacheflush(rp->pc,4);
314 #endif /* defined(ENABLE_REPLACEMENT) */
317 * These are local overrides for various environment variables in Emacs.
318 * Please do not remove this and leave it at the end of the file, where
319 * Emacs will automagically detect them.
320 * ---------------------------------------------------------------------
323 * indent-tabs-mode: t
327 * vim:noexpandtab:sw=4:ts=4: