1 /* src/vm/jit/powerpc64/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
37 #include "vm/jit/powerpc64/codegen.h"
39 #include "vm/exceptions.h"
40 #include "vm/global.h"
42 #include "vm/jit/asmpart.h"
43 #include "vm/jit/codegen-common.h"
44 #include "vm/jit/jit.h"
45 #include "vm/jit/md.h"
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_jit_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 e9ceffb8 ld r14,-72(r14)
93 FIXME 81830000 lwz r12,0(r3)
94 e9cc0000 ld r14,0(r12)
101 FIXME 81830000 lwz r12,0(r3)
102 FIXME 818c0000 lwz r12,0(r12)
103 FIXME 81ac0000 lwz r13,0(r12)
107 *******************************************************************************/
109 void *md_jit_method_patch_address(void *pv, void *ra, void *mptr)
116 /* Go back to the actual load instruction (3 instructions). */
118 pc = ((uint32_t *) ra) - 3;
120 /* get first instruction word (lwz) */
124 /* check if we have 2 instructions (addis, addi) */
126 if ((mcode >> 16) == 0x3c19) {
127 /* XXX write a regression for this */
131 /* get displacement of first instruction (addis) */
133 offset = (int32_t) (mcode << 16);
135 /* get displacement of second instruction (addi) */
139 assert((mcode >> 16) != 0x6739);
141 offset += (int16_t) (mcode & 0x0000ffff);
144 /* get the offset from the instruction */
146 offset = (int16_t) (mcode & 0x0000ffff);
148 /* check for load from PV */
150 if ((mcode >> 16) == 0xe9ce) {
151 /* get the final data segment address */
153 pa = ((uint8_t *) pv) + offset;
155 else if ((mcode >> 16) == 0xe9cc) {
156 /* in this case we use the passed method pointer */
158 /* return NULL if no mptr was specified (used for replacement) */
163 pa = ((uint8_t *) mptr) + offset;
166 /* catch any problems */
168 vm_abort("md_jit_method_patch_address: unknown instruction %x",
171 /* keep compiler happy */
181 /* md_codegen_get_pv_from_pc ***************************************************
186 39cbffe0 addi r14,r11,-32
191 3dcbffff addis r14,r11,-1
192 39ce68b0 addi r14,r13,26800
194 *******************************************************************************/
196 u1 *md_codegen_get_pv_from_pc(u1 *ra)
202 /* get first instruction word after jump */
204 mcode = *((u4 *) (ra + 1 * 4));
206 /* check if we have 2 instructions (addis, addi) */
208 if ((mcode >> 16) == 0x3dcb) {
209 /* get displacement of first instruction (addis) */
211 offset = (s4) (mcode << 16);
213 /* get displacement of second instruction (addi) */
215 mcode = *((u4 *) (ra + 2 * 4));
217 /* check for addi instruction */
219 assert((mcode >> 16) == 0x39ce);
221 offset += (s2) (mcode & 0x0000ffff);
223 else if ((mcode >> 16) == 0x39cb) {
224 /* get offset of first instruction (addi) */
226 offset = (s2) (mcode & 0x0000ffff);
229 vm_abort("md_codegen_get_pv_from_pc: unknown instruction %x", mcode);
231 /* keep compiler happy */
236 /* calculate PV via RA + offset */
244 /* md_cacheflush ***************************************************************
246 Calls the system's function to flush the instruction and data
249 *******************************************************************************/
251 void md_cacheflush(u1 *addr, s4 nbytes)
253 asm_cacheflush(addr, nbytes);
257 /* md_icacheflush **************************************************************
259 Calls the system's function to flush the instruction cache.
261 *******************************************************************************/
263 void md_icacheflush(u1 *addr, s4 nbytes)
265 asm_cacheflush(addr, nbytes);
269 /* md_dcacheflush **************************************************************
271 Calls the system's function to flush the data cache.
273 *******************************************************************************/
275 void md_dcacheflush(u1 *addr, s4 nbytes)
277 asm_cacheflush(addr, nbytes);
281 /* md_patch_replacement_point **************************************************
283 Patch the given replacement point.
285 *******************************************************************************/
287 #if defined(ENABLE_REPLACEMENT)
288 void md_patch_replacement_point(u1 *pc, u1 *savedmcode, bool revert)
293 /* restore the patched-over instruction */
294 *(u4*)(pc) = *(u4*)(savedmcode);
297 /* save the current machine code */
298 *(u4*)(savedmcode) = *(u4*)(pc);
300 /* build the machine code for the patch */
301 mcode = (0x80000000 | (EXCEPTION_HARDWARE_PATCHER));
303 /* write the new machine code */
304 *(u4*)(pc) = (u4) mcode;
307 /* flush instruction cache */
308 md_icacheflush(pc,4);
310 #endif /* defined(ENABLE_REPLACEMENT) */
313 * These are local overrides for various environment variables in Emacs.
314 * Please do not remove this and leave it at the end of the file, where
315 * Emacs will automagically detect them.
316 * ---------------------------------------------------------------------
319 * indent-tabs-mode: t
323 * vim:noexpandtab:sw=4:ts=4: