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
35 #include "vm/jit/powerpc/codegen.h"
37 #include "vm/global.h"
39 #include "vm/jit/asmpart.h"
40 #include "vm/jit/stacktrace.h"
42 #if !defined(NDEBUG) && defined(ENABLE_DISASSEMBLER)
43 # include "vm/jit/disass.h" /* XXX debug */
44 # include "vmcore/options.h" /* XXX debug */
48 /* md_init *********************************************************************
50 Do some machine dependent initialization.
52 *******************************************************************************/
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 PowerPC the return address is located in the linkage area */
73 ra = *((u1 **) (sp + framesize + LA_LR_OFFSET));
79 /* md_get_method_patch_address *************************************************
81 Gets the patch address of the currently compiled method. The offset
82 is extracted from the load instruction(s) before the jump and added
83 to the right base address (PV or REG_METHODPTR).
87 81adffd4 lwz r13,-44(r13)
93 81830000 lwz r12,0(r3)
94 81ac0000 lwz r13,0(r12)
100 81830000 lwz r12,0(r3)
101 818c0000 lwz r12,0(r12)
102 81ac0000 lwz r13,0(r12)
106 *******************************************************************************/
108 u1 *md_get_method_patch_address(u1 *ra, stackframeinfo *sfi, u1 *mptr)
114 /* go back to the actual load instruction (3 instructions) */
118 /* get first instruction word (lwz) */
120 mcode = *((u4 *) ra);
122 /* check if we have 2 instructions (addis, addi) */
124 if ((mcode >> 16) == 0x3c19) {
125 /* XXX write a regression for this */
129 /* get displacement of first instruction (addis) */
131 offset = (s4) (mcode << 16);
133 /* get displacement of second instruction (addi) */
135 mcode = *((u4 *) (ra + 1 * 4));
137 assert((mcode >> 16) != 0x6739);
139 offset += (s2) (mcode & 0x0000ffff);
142 /* get the offset from the instruction */
144 offset = (s2) (mcode & 0x0000ffff);
146 /* check for load from PV */
148 if ((mcode >> 16) == 0x81ad) {
149 /* get the final data segment address */
151 pa = sfi->pv + offset;
153 else if ((mcode >> 16) == 0x81ac) {
154 /* in this case we use the passed method pointer */
156 /* return NULL if no mptr was specified (used for replacement) */
164 /* catch any problems */
166 vm_abort("md_get_method_patch_address: unknown instruction %x",
169 /* keep compiler happy */
179 /* md_codegen_get_pv_from_pc ***************************************************
184 39abffe0 addi r13,r11,-32
189 3dabffff addis r13,r11,-1
190 39ad68b0 addi r13,r13,26800
192 *******************************************************************************/
194 u1 *md_codegen_get_pv_from_pc(u1 *ra)
200 /* get first instruction word after jump */
202 mcode = *((u4 *) (ra + 1 * 4));
204 /* check if we have 2 instructions (addis, addi) */
206 if ((mcode >> 16) == 0x3dab) {
207 /* get displacement of first instruction (addis) */
209 offset = (s4) (mcode << 16);
211 /* get displacement of second instruction (addi) */
213 mcode = *((u4 *) (ra + 2 * 4));
215 /* check for addi instruction */
217 assert((mcode >> 16) == 0x39ad);
219 offset += (s2) (mcode & 0x0000ffff);
222 /* check for addi instruction */
224 assert((mcode >> 16) == 0x39ab);
226 /* get offset of first instruction (addi) */
228 offset = (s2) (mcode & 0x0000ffff);
231 /* calculate PV via RA + offset */
239 /* md_cacheflush ***************************************************************
241 Calls the system's function to flush the instruction and data
244 *******************************************************************************/
246 void md_cacheflush(u1 *addr, s4 nbytes)
248 asm_cacheflush(addr, nbytes);
252 /* md_icacheflush **************************************************************
254 Calls the system's function to flush the instruction cache.
256 *******************************************************************************/
258 void md_icacheflush(u1 *addr, s4 nbytes)
260 asm_cacheflush(addr, nbytes);
264 /* md_dcacheflush **************************************************************
266 Calls the system's function to flush the data cache.
268 *******************************************************************************/
270 void md_dcacheflush(u1 *addr, s4 nbytes)
272 asm_cacheflush(addr, nbytes);
276 /* md_patch_replacement_point **************************************************
278 Patch the given replacement point.
280 *******************************************************************************/
282 #if defined(ENABLE_REPLACEMENT)
283 void md_patch_replacement_point(codeinfo *code, s4 index, rplpoint *rp, u1 *savedmcode)
288 /* restore the patched-over instruction */
289 *(u4*)(rp->pc) = *(u4*)(savedmcode);
292 /* save the current machine code */
293 *(u4*)(savedmcode) = *(u4*)(rp->pc);
295 /* build the machine code for the patch */
296 assert(0); /* XXX build trap instruction below */
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: