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
25 $Id: md.c 7311 2007-02-09 13:20:27Z twisti $
37 #include "vm/jit/powerpc64/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 "vmcore/options.h" /* XXX debug */
46 #include "vm/jit/disass.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));
80 /* md_codegen_patch_branch *****************************************************
82 Back-patches a branch instruction.
83 Changes the dispacment of the jump instruction.
85 *******************************************************************************/
87 void md_codegen_patch_branch(codegendata *cd, s4 branchmpc, s4 targetmpc)
90 s4 disp; /* branch displacement */
93 /* calculate the patch position */
94 mcodeptr = (s4 *) (cd->mcodebase + branchmpc);
96 /* Calculate the branch displacement. */
97 disp = targetmpc - branchmpc + 4;
100 if ((mcode & 0xfc000000) == 0x40000000) {
101 /* conditional jump bcx */
102 if ((disp < (s4) 0xffff8000) || (disp > (s4) 0x00007fff))
103 vm_abort("jump displacement is out of range: %d > +/-%d", disp, 0x00007fff);
106 mcode |= (((disp)& M_BCMASK));
107 } else if ((mcode & 0xfc000000) == 0x48000000) {
108 /* unconditional jump bx */
109 if ((disp < (s4) 0xfc000000) || (disp > (s4) 0x03ffffff))
110 vm_abort("jump displacement is out of range: %d > +/-%d", disp, 0x0cffffff);
112 mcode |= (((disp)& M_BMASK));
114 vm_abort("md_codegen_patch_branch, patching unsupported branch: %xd", mcode);
117 mcodeptr[-1] = mcode;
122 /* md_get_method_patch_address *************************************************
124 Gets the patch address of the currently compiled method. The offset
125 is extracted from the load instruction(s) before the jump and added
126 to the right base address (PV or REG_METHODPTR).
128 INVOKESTATIC/SPECIAL:
130 e9ceffb8 ld r14,-72(r14)
136 FIXME 81830000 lwz r12,0(r3)
137 e9cc0000 ld r14,0(r12)
144 FIXME 81830000 lwz r12,0(r3)
145 FIXME 818c0000 lwz r12,0(r12)
146 FIXME 81ac0000 lwz r13,0(r12)
150 *******************************************************************************/
152 u1 *md_get_method_patch_address(u1 *ra, stackframeinfo *sfi, u1 *mptr)
158 /* go back to the actual load instruction (3 instructions) */
162 /* get first instruction word (lwz) */
164 mcode = *((u4 *) ra);
166 /* check if we have 2 instructions (addis, addi) */
168 if ((mcode >> 16) == 0x3c19) {
169 /* XXX write a regression for this */
172 /* get displacement of first instruction (addis) */
174 offset = (s4) (mcode << 16);
176 /* get displacement of second instruction (addi) */
178 mcode = *((u4 *) (ra + 1 * 4));
180 assert((mcode >> 16) != 0x6739);
182 offset += (s2) (mcode & 0x0000ffff);
185 /* get the offset from the instruction */
187 offset = (s2) (mcode & 0x0000ffff);
189 /* check for load from PV */
191 if ((mcode >> 16) == 0xe9ce) {
192 /* get the final data segment address */
194 pa = sfi->pv + offset;
196 } else if ((mcode >> 16) == 0xe9cc) {
197 /* in this case we use the passed method pointer */
199 /* return NULL if no mptr was specified (used for replacement) */
207 /* catch any problems */
217 /* md_codegen_get_pv_from_pc ***************************************************
222 39cbffe0 addi r14,r11,-32
227 3dcbffff addis r14,r11,-1
228 39ce68b0 addi r14,r13,26800
230 *******************************************************************************/
232 u1 *md_codegen_get_pv_from_pc(u1 *ra)
238 /* get first instruction word after jump */
240 mcode = *((u4 *) (ra + 1 * 4));
242 /* check if we have 2 instructions (addis, addi) */
244 if ((mcode >> 16) == 0x3dcb) {
245 /* get displacement of first instruction (addis) */
247 offset = (s4) (mcode << 16);
249 /* get displacement of second instruction (addi) */
251 mcode = *((u4 *) (ra + 2 * 4));
253 /* check for addi instruction */
255 assert((mcode >> 16) == 0x39ce);
257 offset += (s2) (mcode & 0x0000ffff);
260 /* check for addi instruction */
262 assert((mcode >> 16) == 0x39cb);
264 /* get offset of first instruction (addi) */
266 offset = (s2) (mcode & 0x0000ffff);
269 /* calculate PV via RA + offset */
277 /* md_cacheflush ***************************************************************
279 Calls the system's function to flush the instruction and data
282 *******************************************************************************/
284 void md_cacheflush(u1 *addr, s4 nbytes)
286 asm_cacheflush(addr, nbytes);
290 /* md_icacheflush **************************************************************
292 Calls the system's function to flush the instruction cache.
294 *******************************************************************************/
296 void md_icacheflush(u1 *addr, s4 nbytes)
298 asm_cacheflush(addr, nbytes);
302 /* md_dcacheflush **************************************************************
304 Calls the system's function to flush the data cache.
306 *******************************************************************************/
308 void md_dcacheflush(u1 *addr, s4 nbytes)
310 asm_cacheflush(addr, nbytes);
314 /* md_patch_replacement_point **************************************************
316 Patch the given replacement point.
318 *******************************************************************************/
320 #if defined(ENABLE_REPLACEMENT)
321 void md_patch_replacement_point(codeinfo *code, s4 index, rplpoint *rp, u1 *savedmcode)
327 /* restore the patched-over instruction */
328 *(u4*)(rp->pc) = *(u4*)(savedmcode);
331 /* save the current machine code */
332 *(u4*)(savedmcode) = *(u4*)(rp->pc);
334 /* build the machine code for the patch */
335 disp = ((u4*)code->replacementstubs - (u4*)rp->pc)
336 + index * REPLACEMENT_STUB_SIZE
339 mcode = (18 << 26) | ((((disp) * 4) + 4) & M_BMASK);
341 /* write the new machine code */
342 *(u4*)(rp->pc) = (u4) mcode;
345 #if !defined(NDEBUG) && defined(ENABLE_DISASSEMBLER)
353 /* flush instruction cache */
354 md_icacheflush(rp->pc,4);
356 #endif /* defined(ENABLE_REPLACEMENT) */
359 * These are local overrides for various environment variables in Emacs.
360 * Please do not remove this and leave it at the end of the file, where
361 * Emacs will automagically detect them.
362 * ---------------------------------------------------------------------
365 * indent-tabs-mode: t
369 * vim:noexpandtab:sw=4:ts=4: