1 /* src/vm/jit/x86_64/md-abi.c - functions for x86_64 Linux ABI
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-abi.c 7486 2007-03-08 13:50:07Z twisti $
33 #include "vm/jit/x86_64/md-abi.h"
35 #include "vm/global.h"
37 #include "vm/jit/jit.h" /* for REG_* (maybe can be removed) */
39 #include "vmcore/descriptor.h"
42 /* register descripton array **************************************************/
45 REG_RET, REG_ARG, REG_ARG, REG_TMP, REG_RES, REG_SAV, REG_ARG, REG_ARG,
46 REG_ARG, REG_ARG, REG_RES, REG_RES, REG_SAV, REG_SAV, REG_SAV, REG_SAV,
50 const char *abi_registers_integer_name[] = {
51 "rax", "rcx", "rdx", "rbx", "rsp", "rbp", "rsi", "rdi",
52 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15"
56 s4 nregdescfloat[] = {
57 REG_ARG, REG_ARG, REG_ARG, REG_ARG, REG_ARG, REG_ARG, REG_ARG, REG_ARG,
58 REG_RES, REG_RES, REG_RES, REG_TMP, REG_TMP, REG_TMP, REG_TMP, REG_TMP,
63 /* md_param_alloc **************************************************************
67 *******************************************************************************/
69 void md_param_alloc(methoddesc *md)
77 /* set default values */
83 /* get params field of methoddesc */
87 for (i = 0; i < md->paramcount; i++, pd++) {
88 switch (md->paramtypes[i].type) {
92 if (iarg < INT_ARG_CNT) {
99 pd->regoff = stacksize;
106 if (farg < FLT_ARG_CNT) {
107 pd->inmemory = false;
113 pd->regoff = stacksize;
120 /* Since XMM0 (==A0) is used for passing return values, this
121 argument register usage has to be regarded, too. */
123 if (IS_FLT_DBL_TYPE(md->returntype.type))
127 /* fill register and stack usage */
129 md->argintreguse = iarg;
130 md->argfltreguse = farg;
131 md->memuse = stacksize;
135 /* md_param_alloc_native *******************************************************
137 Pre-allocate arguments according the native ABI.
139 *******************************************************************************/
141 void md_param_alloc_native(methoddesc *md)
143 /* On x86_64 we use the same ABI for JIT method calls as for
144 native method calls. */
150 /* md_return_alloc *************************************************************
152 Precolor the Java Stackelement containing the Return Value. Only
153 for float/ double types straight forward possible, since INT_LNG
154 types use "reserved" registers Float/Double values use a00 as
158 jd: jitdata of the current method
159 stackslot: Java Stackslot to contain the Return Value
162 if precoloring was possible:
163 VAR(stackslot->varnum)->flags = PREALLOC
164 ->vv.regoff = [REG_RESULT|REG_FRESULT]
165 rd->arg[flt|int]reguse set to a value according the register usage
167 NOTE: Do not pass a LOCALVAR in stackslot->varnum.
169 *******************************************************************************/
171 void md_return_alloc(jitdata *jd, stackptr stackslot)
177 /* get required compiler data */
184 /* precoloring only straightforward possible with flt/dbl types
185 For Address/Integer/Long REG_RESULT == rax == REG_ITMP1 and so
186 could be destroyed if the return value Stack Slot "lives too
189 if (IS_FLT_DBL_TYPE(md->returntype.type)) {
190 /* In Leafmethods Local Vars holding parameters are precolored
191 to their argument register -> so leafmethods with
192 paramcount > 0 could already use a00! */
194 if (!jd->isleafmethod || (md->paramcount == 0)) {
195 /* Only precolor the stackslot, if it is not a SAVEDVAR
196 <-> has not to survive method invokations */
198 if (!(stackslot->flags & SAVEDVAR)) {
200 VAR(stackslot->varnum)->flags = PREALLOC;
203 if (rd->argfltreguse < 1)
204 rd->argfltreguse = 1;
206 VAR(stackslot->varnum)->vv.regoff = REG_FRESULT;
214 * These are local overrides for various environment variables in Emacs.
215 * Please do not remove this and leave it at the end of the file, where
216 * Emacs will automagically detect them.
217 * ---------------------------------------------------------------------
220 * indent-tabs-mode: t