1 /* src/vm/jit/x86_64/md-abi.c - functions for x86_64 Linux ABI
3 Copyright (C) 1996-2005, 2006 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 Contact: cacao@cacaojvm.org
27 Authors: Christian Thalinger
31 $Id: md-abi.c 8298 2007-08-12 18:49:16Z pm $
39 #include "vm/jit/s390/md-abi.h"
41 #include "vmcore/descriptor.h"
42 #include "vm/global.h"
43 #include "vm/jit/jit.h"
46 /* register descripton array **************************************************/
49 /* r0, itmp1, a0, a1, a2, a3, a4, s0, */
50 REG_TMP, REG_RES, REG_ARG, REG_ARG, REG_ARG, REG_ARG, REG_ARG, REG_SAV,
51 /* s1, s2, s3, s4, itmp2, pv, ra/itmp3, sp */
52 REG_SAV, REG_SAV, REG_SAV, REG_SAV, REG_RES, REG_RES, REG_RES, REG_RES,
56 const char *abi_registers_integer_name[] = {
57 "r0", "r1", "r2", "r3",
58 "r4", "r5", "r6", "r7",
59 "r8", "r9", "r10", "r11",
60 "r12", "r13", "r14", "r15"
63 const s4 abi_registers_integer_argument[] = {
71 const s4 abi_registers_integer_saved[] = {
79 const s4 abi_registers_integer_temporary[] = {
83 s4 nregdescfloat[] = {
84 REG_ARG, REG_TMP, REG_ARG, REG_TMP, REG_SAV, REG_TMP, REG_SAV, REG_TMP,
85 REG_TMP, REG_TMP, REG_TMP, REG_TMP, REG_TMP, REG_TMP, REG_TMP, REG_TMP,
89 const s4 abi_registers_float_argument[] = {
94 const s4 abi_registers_float_saved[] = {
99 const s4 abi_registers_float_temporary[] = {
114 /* md_param_alloc_intern *******************************************************
116 Allocates parameters to registers or stackslots for both native and java
120 slot: size in bytes of a stack slot
121 slots1w: number of stack slots used by a 1 word type parameter
122 slots2w: number of stack slots used by a 2 word type parameter
124 *******************************************************************************/
126 static void md_param_alloc_intern(methoddesc *md, s4 slot, s4 slots1w, s4 slots2w)
134 /* set default values */
140 /* get params field of methoddesc */
144 for (i = 0; i < md->paramcount; i++, pd++) {
145 switch (md->paramtypes[i].type) {
148 if (iarg < INT_ARG_CNT) {
149 pd->inmemory = false;
150 pd->regoff = abi_registers_integer_argument[iarg];
156 pd->regoff = stacksize * slot;
157 pd->index = stacksize;
158 stacksize += slots1w;
163 if (iarg < INT_ARG_CNT - 1) {
165 pd->inmemory = false;
167 PACK_REGS(abi_registers_integer_argument[iarg + 1],
168 abi_registers_integer_argument[iarg]);
169 pd->index = PACK_REGS(iarg + 1, iarg);
173 /* _ALIGN(stacksize); */
175 pd->regoff = stacksize * slot;
176 pd->index = stacksize;
178 stacksize += slots2w;
183 if (farg < FLT_ARG_CNT) {
184 pd->inmemory = false;
185 pd->regoff = abi_registers_float_argument[farg];
191 pd->regoff = stacksize * slot;
192 pd->index = stacksize;
193 stacksize += slots1w;
198 if (farg < FLT_ARG_CNT) {
199 pd->inmemory = false;
200 pd->regoff = abi_registers_float_argument[farg];
205 /* _ALIGN(stacksize); */
207 pd->regoff = stacksize * slot;
208 pd->index = stacksize;
209 stacksize += slots2w;
218 /* Since A0+A1/FA0 are used for passing return
219 values, this argument register usage has to be regarded,
222 if (IS_INT_LNG_TYPE(md->returntype.type)) {
223 if (iarg < (IS_2_WORD_TYPE(md->returntype.type) ? 2 : 1))
224 iarg = IS_2_WORD_TYPE(md->returntype.type) ? 2 : 1;
227 if (IS_FLT_DBL_TYPE(md->returntype.type))
232 /* fill register and stack usage */
234 md->argintreguse = iarg;
235 md->argfltreguse = farg;
236 md->memuse = stacksize;
239 void md_param_alloc(methoddesc *md)
241 md_param_alloc_intern(md, 8, 1, 1);
244 void md_param_alloc_native(methoddesc *md)
246 md_param_alloc_intern(md, 4, 1, 2);
250 /* md_return_alloc *************************************************************
252 Precolor the Java Stackelement containing the Return Value. Only
253 for float/ double types straight forward possible, since INT_LNG
254 types use "reserved" registers Float/Double values use a00 as
258 jd: jitdata of the current method
259 stackslot: Java Stackslot to contain the Return Value
262 if precoloring was possible:
263 VAR(stackslot->varnum)->flags = PREALLOC
264 ->vv.regoff = [REG_RESULT|REG_FRESULT]
265 rd->arg[flt|int]reguse set to a value according the register usage
267 NOTE: Do not pass a LOCALVAR in stackslot->varnum.
269 *******************************************************************************/
271 void md_return_alloc(jitdata *jd, stackptr stackslot)
277 /* get required compiler data */
284 /* In Leafmethods Local Vars holding parameters are precolored to
285 their argument register -> so leafmethods with paramcount > 0
286 could already use R3 == a00! */
288 if (!jd->isleafmethod || (md->paramcount == 0)) {
289 /* Only precolor the stackslot, if it is not a SAVEDVAR <->
290 has not to survive method invokations. */
292 if (!(stackslot->flags & SAVEDVAR)) {
293 VAR(stackslot->varnum)->flags = PREALLOC;
295 if (IS_INT_LNG_TYPE(md->returntype.type)) {
296 if (!IS_2_WORD_TYPE(md->returntype.type)) {
297 if (rd->argintreguse < 1)
298 rd->argintreguse = 1;
300 VAR(stackslot->varnum)->vv.regoff = REG_RESULT;
303 if (rd->argintreguse < 2)
304 rd->argintreguse = 2;
306 VAR(stackslot->varnum)->vv.regoff = REG_RESULT_PACKED;
309 else { /* float/double */
310 if (rd->argfltreguse < 1)
311 rd->argfltreguse = 1;
313 VAR(stackslot->varnum)->vv.regoff = REG_FRESULT;
321 * These are local overrides for various environment variables in Emacs.
322 * Please do not remove this and leave it at the end of the file, where
323 * Emacs will automagically detect them.
324 * ---------------------------------------------------------------------
327 * indent-tabs-mode: t