1 /* src/vm/jit/x86_64/md.c - machine dependent x86_64 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 7486 2007-03-08 13:50:07Z twisti $
35 #include "vm/jit/x86_64/md-abi.h"
37 #if defined(ENABLE_THREADS)
38 # include "threads/native/threads.h"
41 #include "vm/jit/asmpart.h"
42 #include "vm/jit/codegen-common.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_codegen_patch_branch *****************************************************
65 Back-patches a branch instruction.
67 *******************************************************************************/
69 void md_codegen_patch_branch(codegendata *cd, s4 branchmpc, s4 targetmpc)
72 s4 disp; /* branch displacement */
74 /* calculate the patch position */
76 mcodeptr = (s4 *) (cd->mcodebase + branchmpc);
78 /* Calculate the branch displacement. */
80 disp = targetmpc - branchmpc;
82 /* I don't think we have to check for branch-displacement
83 overflow. +/-2GB should be enough. */
85 /* patch the branch instruction before the mcodeptr */
91 /* md_stacktrace_get_returnaddress *********************************************
93 Returns the return address of the current stackframe, specified by
94 the passed stack pointer and the stack frame size.
96 *******************************************************************************/
98 u1 *md_stacktrace_get_returnaddress(u1 *sp, u4 framesize)
102 /* on x86_64 the return address is above the current stack frame */
104 ra = *((u1 **) (sp + framesize));
110 /* md_get_method_patch_address *************************************************
112 Gets the patch address of the currently compiled method. The offset
113 is extracted from the load instruction(s) before the jump and added
114 to the right base address (PV or REG_METHODPTR).
116 INVOKESTATIC/SPECIAL:
118 4d 8b 15 e2 fe ff ff mov -286(%rip),%r10
119 49 ff d2 rex64Z callq *%r10
123 4c 8b 17 mov (%rdi),%r10
124 49 8b 82 00 00 00 00 mov 0x0(%r10),%rax
125 48 ff d3 rex64 callq *%rax
129 4c 8b 17 mov (%rdi),%r10
130 4d 8b 92 00 00 00 00 mov 0x0(%r10),%r10
131 49 8b 82 00 00 00 00 mov 0x0(%r10),%rax
132 48 ff d3 rex64 callq *%r11
134 *******************************************************************************/
136 u1 *md_get_method_patch_address(u1 *ra, stackframeinfo *sfi, u1 *mptr)
140 u1 *pa; /* patch address */
142 /* go back to the actual call instruction (3-bytes) */
146 /* get the last byte of the call */
150 /* check for the different calls */
153 /* INVOKESTATIC/SPECIAL */
155 /* Get the offset from the instruction (the offset address is
156 4-bytes before the call instruction). */
158 offset = *((s4 *) (ra - 4));
160 /* add the offset to the return address (IP-relative addressing) */
164 else if (mcode == 0xd3) {
165 /* INVOKEVIRTUAL/INTERFACE */
167 /* return NULL if no mptr was specified (used for replacement) */
172 /* Get the offset from the instruction (the offset address is
173 4-bytes before the call instruction). */
175 offset = *((s4 *) (ra - 4));
177 /* add the offset to the method pointer */
182 /* catch any problems */
191 /* md_codegen_get_pv_from_pc ***************************************************
193 On this architecture just a wrapper function to
194 codegen_get_pv_from_pc.
196 *******************************************************************************/
198 u1 *md_codegen_get_pv_from_pc(u1 *ra)
202 /* Get the start address of the function which contains this
203 address from the method table. */
205 pv = codegen_get_pv_from_pc(ra);
211 /* md_cacheflush ***************************************************************
213 Calls the system's function to flush the instruction and data
216 *******************************************************************************/
218 void md_cacheflush(u1 *addr, s4 nbytes)
224 /* md_icacheflush **************************************************************
226 Calls the system's function to flush the instruction cache.
228 *******************************************************************************/
230 void md_icacheflush(u1 *addr, s4 nbytes)
236 /* md_dcacheflush **************************************************************
238 Calls the system's function to flush the data cache.
240 *******************************************************************************/
242 void md_dcacheflush(u1 *addr, s4 nbytes)
248 /* md_patch_replacement_point **************************************************
250 Patch the given replacement point.
252 *******************************************************************************/
254 #if defined(ENABLE_REPLACEMENT)
255 void md_patch_replacement_point(codeinfo *code, s4 index, rplpoint *rp, u1 *savedmcode)
260 /* XXX this is probably unsafe! */
263 /* write spinning instruction */
264 *(u2*)(rp->pc) = 0xebfe;
267 rp->pc[4] = savedmcode[4];
269 /* write first word */
270 *(u4*)(rp->pc) = *(u4*)(savedmcode);
273 /* save the current machine code */
274 *(u4*)(savedmcode) = *(u4*)(rp->pc);
275 savedmcode[4] = rp->pc[4];
277 /* build the machine code for the patch */
278 disp = (code->replacementstubs - rp->pc)
279 + index * REPLACEMENT_STUB_SIZE
282 mcode = 0xe9 | ((u8) disp << 8);
284 /* write spinning instruction */
285 *(u2*)(rp->pc) = 0xebfe;
288 rp->pc[4] = (mcode >> 32);
290 /* write first word */
291 *(u4*)(rp->pc) = (u4) mcode;
294 #if !defined(NDEBUG) && defined(ENABLE_DISASSEMBLER) && 0
302 /* XXX if required asm_cacheflush(rp->pc,8); */
304 #endif /* defined(ENABLE_REPLACEMENT) */
307 * These are local overrides for various environment variables in Emacs.
308 * Please do not remove this and leave it at the end of the file, where
309 * Emacs will automagically detect them.
310 * ---------------------------------------------------------------------
313 * indent-tabs-mode: t
317 * vim:noexpandtab:sw=4:ts=4: