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
36 #include "vm/jit/powerpc64/codegen.h"
38 #include "vm/global.h"
40 #include "vm/jit/asmpart.h"
41 #include "vm/jit/stacktrace.h"
43 #if !defined(NDEBUG) && defined(ENABLE_DISASSEMBLER)
44 #include "vmcore/options.h" /* XXX debug */
45 #include "vm/jit/disass.h" /* XXX debug */
49 /* md_init *********************************************************************
51 Do some machine dependent initialization.
53 *******************************************************************************/
61 /* md_stacktrace_get_returnaddress *********************************************
63 Returns the return address of the current stackframe, specified by
64 the passed stack pointer and the stack frame size.
66 *******************************************************************************/
68 u1 *md_stacktrace_get_returnaddress(u1 *sp, u4 framesize)
72 /* on PowerPC the return address is located in the linkage area */
74 ra = *((u1 **) (sp + framesize + LA_LR_OFFSET));
79 /* md_codegen_patch_branch *****************************************************
81 Back-patches a branch instruction.
82 Changes the dispacment of the jump instruction.
84 *******************************************************************************/
86 void md_codegen_patch_branch(codegendata *cd, s4 branchmpc, s4 targetmpc)
89 s4 disp; /* branch displacement */
92 /* calculate the patch position */
93 mcodeptr = (s4 *) (cd->mcodebase + branchmpc);
95 /* Calculate the branch displacement. */
96 disp = targetmpc - branchmpc + 4;
99 if ((mcode & 0xfc000000) == 0x40000000) {
100 /* conditional jump bcx */
101 if ((disp < (s4) 0xffff8000) || (disp > (s4) 0x00007fff))
102 vm_abort("jump displacement is out of range: %d > +/-%d", disp, 0x00007fff);
105 mcode |= (((disp)& M_BCMASK));
106 } else if ((mcode & 0xfc000000) == 0x48000000) {
107 /* unconditional jump bx */
108 if ((disp < (s4) 0xfc000000) || (disp > (s4) 0x03ffffff))
109 vm_abort("jump displacement is out of range: %d > +/-%d", disp, 0x0cffffff);
111 mcode |= (((disp)& M_BMASK));
113 vm_abort("md_codegen_patch_branch, patching unsupported branch: %xd", mcode);
116 mcodeptr[-1] = mcode;
121 /* md_get_method_patch_address *************************************************
123 Gets the patch address of the currently compiled method. The offset
124 is extracted from the load instruction(s) before the jump and added
125 to the right base address (PV or REG_METHODPTR).
127 INVOKESTATIC/SPECIAL:
129 e9ceffb8 ld r14,-72(r14)
135 FIXME 81830000 lwz r12,0(r3)
136 e9cc0000 ld r14,0(r12)
143 FIXME 81830000 lwz r12,0(r3)
144 FIXME 818c0000 lwz r12,0(r12)
145 FIXME 81ac0000 lwz r13,0(r12)
149 *******************************************************************************/
151 u1 *md_get_method_patch_address(u1 *ra, stackframeinfo *sfi, u1 *mptr)
157 /* go back to the actual load instruction (3 instructions) */
161 /* get first instruction word (lwz) */
163 mcode = *((u4 *) ra);
165 /* check if we have 2 instructions (addis, addi) */
167 if ((mcode >> 16) == 0x3c19) {
168 /* 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 */
209 vm_abort("md_get_method_patch_address: unknown instruction %x",
212 /* keep compiler happy */
222 /* md_codegen_get_pv_from_pc ***************************************************
227 39cbffe0 addi r14,r11,-32
232 3dcbffff addis r14,r11,-1
233 39ce68b0 addi r14,r13,26800
235 *******************************************************************************/
237 u1 *md_codegen_get_pv_from_pc(u1 *ra)
243 /* get first instruction word after jump */
245 mcode = *((u4 *) (ra + 1 * 4));
247 /* check if we have 2 instructions (addis, addi) */
249 if ((mcode >> 16) == 0x3dcb) {
250 /* get displacement of first instruction (addis) */
252 offset = (s4) (mcode << 16);
254 /* get displacement of second instruction (addi) */
256 mcode = *((u4 *) (ra + 2 * 4));
258 /* check for addi instruction */
260 assert((mcode >> 16) == 0x39ce);
262 offset += (s2) (mcode & 0x0000ffff);
264 else if ((mcode >> 16) == 0x39cb) {
265 /* get offset of first instruction (addi) */
267 offset = (s2) (mcode & 0x0000ffff);
270 vm_abort("md_codegen_get_pv_from_pc: unknown instruction %x", mcode);
272 /* keep compiler happy */
277 /* calculate PV via RA + offset */
285 /* md_cacheflush ***************************************************************
287 Calls the system's function to flush the instruction and data
290 *******************************************************************************/
292 void md_cacheflush(u1 *addr, s4 nbytes)
294 asm_cacheflush(addr, nbytes);
298 /* md_icacheflush **************************************************************
300 Calls the system's function to flush the instruction cache.
302 *******************************************************************************/
304 void md_icacheflush(u1 *addr, s4 nbytes)
306 asm_cacheflush(addr, nbytes);
310 /* md_dcacheflush **************************************************************
312 Calls the system's function to flush the data cache.
314 *******************************************************************************/
316 void md_dcacheflush(u1 *addr, s4 nbytes)
318 asm_cacheflush(addr, nbytes);
322 /* md_patch_replacement_point **************************************************
324 Patch the given replacement point.
326 *******************************************************************************/
328 #if defined(ENABLE_REPLACEMENT)
329 void md_patch_replacement_point(codeinfo *code, s4 index, rplpoint *rp, u1 *savedmcode)
334 /* restore the patched-over instruction */
335 *(u4*)(rp->pc) = *(u4*)(savedmcode);
338 /* save the current machine code */
339 *(u4*)(savedmcode) = *(u4*)(rp->pc);
341 /* build the machine code for the patch */
342 assert(0); /* XXX build trap instruction below */
345 /* write the new machine code */
346 *(u4*)(rp->pc) = (u4) mcode;
349 #if !defined(NDEBUG) && defined(ENABLE_DISASSEMBLER)
357 /* flush instruction cache */
358 md_icacheflush(rp->pc,4);
360 #endif /* defined(ENABLE_REPLACEMENT) */
363 * These are local overrides for various environment variables in Emacs.
364 * Please do not remove this and leave it at the end of the file, where
365 * Emacs will automagically detect them.
366 * ---------------------------------------------------------------------
369 * indent-tabs-mode: t
373 * vim:noexpandtab:sw=4:ts=4: