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 7355 2007-02-14 10:57:32Z twisti $
38 #include "vm/jit/powerpc64/codegen.h"
40 #include "vm/global.h"
42 #include "vm/jit/asmpart.h"
43 #include "vm/jit/stacktrace.h"
45 #if !defined(NDEBUG) && defined(ENABLE_DISASSEMBLER)
46 #include "vmcore/options.h" /* XXX debug */
47 #include "vm/jit/disass.h" /* XXX debug */
51 /* md_init *********************************************************************
53 Do some machine dependent initialization.
55 *******************************************************************************/
63 /* md_stacktrace_get_returnaddress *********************************************
65 Returns the return address of the current stackframe, specified by
66 the passed stack pointer and the stack frame size.
68 *******************************************************************************/
70 u1 *md_stacktrace_get_returnaddress(u1 *sp, u4 framesize)
74 /* on PowerPC the return address is located in the linkage area */
76 ra = *((u1 **) (sp + framesize + LA_LR_OFFSET));
81 /* md_codegen_patch_branch *****************************************************
83 Back-patches a branch instruction.
84 Changes the dispacment of the jump instruction.
86 *******************************************************************************/
88 void md_codegen_patch_branch(codegendata *cd, s4 branchmpc, s4 targetmpc)
91 s4 disp; /* branch displacement */
94 /* calculate the patch position */
95 mcodeptr = (s4 *) (cd->mcodebase + branchmpc);
97 /* Calculate the branch displacement. */
98 disp = targetmpc - branchmpc + 4;
101 if ((mcode & 0xfc000000) == 0x40000000) {
102 /* conditional jump bcx */
103 if ((disp < (s4) 0xffff8000) || (disp > (s4) 0x00007fff))
104 vm_abort("jump displacement is out of range: %d > +/-%d", disp, 0x00007fff);
107 mcode |= (((disp)& M_BCMASK));
108 } else if ((mcode & 0xfc000000) == 0x48000000) {
109 /* unconditional jump bx */
110 if ((disp < (s4) 0xfc000000) || (disp > (s4) 0x03ffffff))
111 vm_abort("jump displacement is out of range: %d > +/-%d", disp, 0x0cffffff);
113 mcode |= (((disp)& M_BMASK));
115 vm_abort("md_codegen_patch_branch, patching unsupported branch: %xd", mcode);
118 mcodeptr[-1] = mcode;
123 /* md_get_method_patch_address *************************************************
125 Gets the patch address of the currently compiled method. The offset
126 is extracted from the load instruction(s) before the jump and added
127 to the right base address (PV or REG_METHODPTR).
129 INVOKESTATIC/SPECIAL:
131 e9ceffb8 ld r14,-72(r14)
137 FIXME 81830000 lwz r12,0(r3)
138 e9cc0000 ld r14,0(r12)
145 FIXME 81830000 lwz r12,0(r3)
146 FIXME 818c0000 lwz r12,0(r12)
147 FIXME 81ac0000 lwz r13,0(r12)
151 *******************************************************************************/
153 u1 *md_get_method_patch_address(u1 *ra, stackframeinfo *sfi, u1 *mptr)
159 /* go back to the actual load instruction (3 instructions) */
163 /* get first instruction word (lwz) */
165 mcode = *((u4 *) ra);
167 /* check if we have 2 instructions (addis, addi) */
169 if ((mcode >> 16) == 0x3c19) {
170 /* XXX write a regression for this */
173 /* get displacement of first instruction (addis) */
175 offset = (s4) (mcode << 16);
177 /* get displacement of second instruction (addi) */
179 mcode = *((u4 *) (ra + 1 * 4));
181 assert((mcode >> 16) != 0x6739);
183 offset += (s2) (mcode & 0x0000ffff);
186 /* get the offset from the instruction */
188 offset = (s2) (mcode & 0x0000ffff);
190 /* check for load from PV */
192 if ((mcode >> 16) == 0xe9ce) {
193 /* get the final data segment address */
195 pa = sfi->pv + offset;
197 } else if ((mcode >> 16) == 0xe9cc) {
198 /* in this case we use the passed method pointer */
200 /* return NULL if no mptr was specified (used for replacement) */
208 /* catch any problems */
218 /* md_codegen_get_pv_from_pc ***************************************************
223 39cbffe0 addi r14,r11,-32
228 3dcbffff addis r14,r11,-1
229 39ce68b0 addi r14,r13,26800
231 *******************************************************************************/
233 u1 *md_codegen_get_pv_from_pc(u1 *ra)
239 /* get first instruction word after jump */
241 mcode = *((u4 *) (ra + 1 * 4));
243 /* check if we have 2 instructions (addis, addi) */
245 if ((mcode >> 16) == 0x3dcb) {
246 /* get displacement of first instruction (addis) */
248 offset = (s4) (mcode << 16);
250 /* get displacement of second instruction (addi) */
252 mcode = *((u4 *) (ra + 2 * 4));
254 /* check for addi instruction */
256 assert((mcode >> 16) == 0x39ce);
258 offset += (s2) (mcode & 0x0000ffff);
261 /* check for addi instruction */
263 assert((mcode >> 16) == 0x39cb);
265 /* get offset of first instruction (addi) */
267 offset = (s2) (mcode & 0x0000ffff);
270 /* calculate PV via RA + offset */
278 /* md_cacheflush ***************************************************************
280 Calls the system's function to flush the instruction and data
283 *******************************************************************************/
285 void md_cacheflush(u1 *addr, s4 nbytes)
287 asm_cacheflush(addr, nbytes);
291 /* md_icacheflush **************************************************************
293 Calls the system's function to flush the instruction cache.
295 *******************************************************************************/
297 void md_icacheflush(u1 *addr, s4 nbytes)
299 asm_cacheflush(addr, nbytes);
303 /* md_dcacheflush **************************************************************
305 Calls the system's function to flush the data cache.
307 *******************************************************************************/
309 void md_dcacheflush(u1 *addr, s4 nbytes)
311 asm_cacheflush(addr, nbytes);
315 /* md_patch_replacement_point **************************************************
317 Patch the given replacement point.
319 *******************************************************************************/
321 #if defined(ENABLE_REPLACEMENT)
322 void md_patch_replacement_point(codeinfo *code, s4 index, rplpoint *rp, u1 *savedmcode)
328 /* restore the patched-over instruction */
329 *(u4*)(rp->pc) = *(u4*)(savedmcode);
332 /* save the current machine code */
333 *(u4*)(savedmcode) = *(u4*)(rp->pc);
335 /* build the machine code for the patch */
336 disp = ((u4*)code->replacementstubs - (u4*)rp->pc)
337 + index * REPLACEMENT_STUB_SIZE
340 mcode = (18 << 26) | ((((disp) * 4) + 4) & M_BMASK);
342 /* write the new machine code */
343 *(u4*)(rp->pc) = (u4) mcode;
346 #if !defined(NDEBUG) && defined(ENABLE_DISASSEMBLER)
354 /* flush instruction cache */
355 md_icacheflush(rp->pc,4);
357 #endif /* defined(ENABLE_REPLACEMENT) */
360 * These are local overrides for various environment variables in Emacs.
361 * Please do not remove this and leave it at the end of the file, where
362 * Emacs will automagically detect them.
363 * ---------------------------------------------------------------------
366 * indent-tabs-mode: t
370 * vim:noexpandtab:sw=4:ts=4: