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"
43 /* md_init *********************************************************************
45 Do some machine dependent initialization.
47 *******************************************************************************/
55 /* md_stacktrace_get_returnaddress *********************************************
57 Returns the return address of the current stackframe, specified by
58 the passed stack pointer and the stack frame size.
60 *******************************************************************************/
62 u1 *md_stacktrace_get_returnaddress(u1 *sp, u4 framesize)
66 /* on PowerPC the return address is located in the linkage area */
68 ra = *((u1 **) (sp + framesize + LA_LR_OFFSET));
74 /* md_get_method_patch_address *************************************************
76 Gets the patch address of the currently compiled method. The offset
77 is extracted from the load instruction(s) before the jump and added
78 to the right base address (PV or REG_METHODPTR).
82 81adffd4 lwz r13,-44(r13)
88 81830000 lwz r12,0(r3)
89 81ac0000 lwz r13,0(r12)
95 81830000 lwz r12,0(r3)
96 818c0000 lwz r12,0(r12)
97 81ac0000 lwz r13,0(r12)
101 *******************************************************************************/
103 u1 *md_get_method_patch_address(u1 *ra, stackframeinfo *sfi, u1 *mptr)
109 /* go back to the actual load instruction (3 instructions) */
113 /* get first instruction word (lwz) */
115 mcode = *((u4 *) ra);
117 /* check if we have 2 instructions (addis, addi) */
119 if ((mcode >> 16) == 0x3c19) {
120 /* XXX write a regression for this */
124 /* get displacement of first instruction (addis) */
126 offset = (s4) (mcode << 16);
128 /* get displacement of second instruction (addi) */
130 mcode = *((u4 *) (ra + 1 * 4));
132 assert((mcode >> 16) != 0x6739);
134 offset += (s2) (mcode & 0x0000ffff);
137 /* get the offset from the instruction */
139 offset = (s2) (mcode & 0x0000ffff);
141 /* check for load from PV */
143 if ((mcode >> 16) == 0x81ad) {
144 /* get the final data segment address */
146 pa = sfi->pv + offset;
148 else if ((mcode >> 16) == 0x81ac) {
149 /* in this case we use the passed method pointer */
151 /* return NULL if no mptr was specified (used for replacement) */
159 /* catch any problems */
161 vm_abort("md_get_method_patch_address: unknown instruction %x",
164 /* keep compiler happy */
174 /* md_codegen_get_pv_from_pc ***************************************************
179 39abffe0 addi r13,r11,-32
184 3dabffff addis r13,r11,-1
185 39ad68b0 addi r13,r13,26800
187 *******************************************************************************/
189 u1 *md_codegen_get_pv_from_pc(u1 *ra)
195 /* get first instruction word after jump */
197 mcode = *((u4 *) (ra + 1 * 4));
199 /* check if we have 2 instructions (addis, addi) */
201 if ((mcode >> 16) == 0x3dab) {
202 /* get displacement of first instruction (addis) */
204 offset = (s4) (mcode << 16);
206 /* get displacement of second instruction (addi) */
208 mcode = *((u4 *) (ra + 2 * 4));
210 /* check for addi instruction */
212 assert((mcode >> 16) == 0x39ad);
214 offset += (s2) (mcode & 0x0000ffff);
217 /* check for addi instruction */
219 assert((mcode >> 16) == 0x39ab);
221 /* get offset of first instruction (addi) */
223 offset = (s2) (mcode & 0x0000ffff);
226 /* calculate PV via RA + offset */
234 /* md_cacheflush ***************************************************************
236 Calls the system's function to flush the instruction and data
239 *******************************************************************************/
241 void md_cacheflush(u1 *addr, s4 nbytes)
243 asm_cacheflush(addr, nbytes);
247 /* md_icacheflush **************************************************************
249 Calls the system's function to flush the instruction cache.
251 *******************************************************************************/
253 void md_icacheflush(u1 *addr, s4 nbytes)
255 asm_cacheflush(addr, nbytes);
259 /* md_dcacheflush **************************************************************
261 Calls the system's function to flush the data cache.
263 *******************************************************************************/
265 void md_dcacheflush(u1 *addr, s4 nbytes)
267 asm_cacheflush(addr, nbytes);
271 /* md_patch_replacement_point **************************************************
273 Patch the given replacement point.
275 *******************************************************************************/
277 #if defined(ENABLE_REPLACEMENT)
278 void md_patch_replacement_point(u1 *pc, u1 *savedmcode, bool revert)
283 /* restore the patched-over instruction */
284 *(u4*)(pc) = *(u4*)(savedmcode);
287 /* save the current machine code */
288 *(u4*)(savedmcode) = *(u4*)(pc);
290 /* build the machine code for the patch */
291 assert(0); /* XXX build trap instruction below */
294 /* write the new machine code */
295 *(u4*)(pc) = (u4) mcode;
298 /* flush instruction cache */
299 md_icacheflush(pc,4);
301 #endif /* defined(ENABLE_REPLACEMENT) */
304 * These are local overrides for various environment variables in Emacs.
305 * Please do not remove this and leave it at the end of the file, where
306 * Emacs will automagically detect them.
307 * ---------------------------------------------------------------------
310 * indent-tabs-mode: t
314 * vim:noexpandtab:sw=4:ts=4: