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
34 #include "vm/jit/x86_64/md-abi.h"
38 #include "vm/jit/codegen-common.h"
39 #include "vm/jit/jit.h"
40 #include "vm/jit/md.h"
43 /* md_init *********************************************************************
45 Do some machine dependent initialization.
47 *******************************************************************************/
55 /* md_stacktrace_get_returnaddress *********************************************
57 Returns the return address of the current stackframe, specified by
58 the passed stack pointer and the stack frame size.
60 *******************************************************************************/
62 u1 *md_stacktrace_get_returnaddress(u1 *sp, u4 framesize)
66 /* on x86_64 the return address is above the current stack frame */
68 ra = *((u1 **) (sp + framesize));
74 /* md_jit_method_patch_address *************************************************
76 Gets the patch address of the currently compiled method. The offset
77 is extracted from the load instruction(s) before the jump and added
78 to the right base address (PV or REG_METHODPTR).
82 4d 8b 15 e2 fe ff ff mov -286(%rip),%r10
83 49 ff d2 rex64Z callq *%r10
87 4c 8b 17 mov (%rdi),%r10
88 49 8b 82 00 00 00 00 mov 0x0(%r10),%rax
89 48 ff d3 rex64 callq *%rax
93 4c 8b 17 mov (%rdi),%r10
94 4d 8b 92 00 00 00 00 mov 0x0(%r10),%r10
95 49 8b 82 00 00 00 00 mov 0x0(%r10),%rax
96 48 ff d3 rex64 callq *%r11
98 *******************************************************************************/
100 void *md_jit_method_patch_address(void *pv, void *ra, void *mptr)
105 void *pa; /* patch address */
107 /* go back to the actual call instruction (3-bytes) */
109 pc = ((uint8_t *) ra) - 3;
111 /* get the last byte of the call */
115 /* check for the different calls */
118 /* INVOKESTATIC/SPECIAL */
120 /* Get the offset from the instruction (the offset address is
121 4-bytes before the call instruction). */
123 offset = *((int32_t *) (pc - 4));
125 /* add the offset to the return address (IP-relative addressing) */
129 else if (mcode == 0xd3) {
130 /* INVOKEVIRTUAL/INTERFACE */
132 /* return NULL if no mptr was specified (used for replacement) */
137 /* Get the offset from the instruction (the offset address is
138 4-bytes before the call instruction). */
140 offset = *((int32_t *) (pc - 4));
142 /* add the offset to the method pointer */
144 pa = ((uint8_t *) mptr) + offset;
147 /* catch any problems */
149 vm_abort("md_jit_method_patch_address: unknown instruction %x", mcode);
151 /* keep compiler happy */
160 /* md_codegen_get_pv_from_pc ***************************************************
162 On this architecture just a wrapper function to
163 codegen_get_pv_from_pc.
165 *******************************************************************************/
167 u1 *md_codegen_get_pv_from_pc(u1 *ra)
171 /* Get the start address of the function which contains this
172 address from the method table. */
174 pv = codegen_get_pv_from_pc(ra);
180 /* md_cacheflush ***************************************************************
182 Calls the system's function to flush the instruction and data
185 *******************************************************************************/
187 void md_cacheflush(u1 *addr, s4 nbytes)
193 /* md_icacheflush **************************************************************
195 Calls the system's function to flush the instruction cache.
197 *******************************************************************************/
199 void md_icacheflush(u1 *addr, s4 nbytes)
205 /* md_dcacheflush **************************************************************
207 Calls the system's function to flush the data cache.
209 *******************************************************************************/
211 void md_dcacheflush(u1 *addr, s4 nbytes)
217 /* md_patch_replacement_point **************************************************
219 Patch the given replacement point.
221 *******************************************************************************/
223 #if defined(ENABLE_REPLACEMENT)
224 void md_patch_replacement_point(u1 *pc, u1 *savedmcode, bool revert)
229 /* write saved machine code */
230 *(u2*)(pc) = *(u2*)(savedmcode);
233 /* save the current machine code */
234 *(u2*)(savedmcode) = *(u2*)(pc);
236 /* build the machine code for the patch */
239 /* write new machine code */
240 *(u2*)(pc) = (u2) mcode;
243 /* XXX if required asm_cacheflush(pc,8); */
245 #endif /* defined(ENABLE_REPLACEMENT) */
248 * These are local overrides for various environment variables in Emacs.
249 * Please do not remove this and leave it at the end of the file, where
250 * Emacs will automagically detect them.
251 * ---------------------------------------------------------------------
254 * indent-tabs-mode: t
258 * vim:noexpandtab:sw=4:ts=4: