1 /* src/vm/jit/powerpc/linux/md-abi.c - functions for PowerPC 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
29 Changes: Christian Ullrich
31 $Id: md-abi.c 4357 2006-01-22 23:33:38Z twisti $
39 #include "vm/jit/powerpc/linux/md-abi.h"
41 #include "vm/descriptor.h"
42 #include "vm/global.h"
45 #define _ALIGN(a) do { if ((a) & 1) (a)++; } while (0)
48 /* register descripton array **************************************************/
51 /* zero, sp, NO(sys), a0/v0, a0/v1, a2, a3, a4, */
52 REG_RES, REG_RES, REG_RES, REG_ARG, REG_ARG, REG_ARG, REG_ARG, REG_ARG,
54 /* a5, a6, a7, itmp1, itmp2, pv, s0, s1, */
55 REG_ARG, REG_ARG, REG_ARG, REG_RES, REG_RES, REG_RES, REG_SAV, REG_SAV,
57 /*itmp3, t0, t1, t2, t3, t4, t5, t6, */
58 REG_RES, REG_TMP, REG_TMP, REG_TMP, REG_TMP, REG_TMP, REG_TMP, REG_TMP,
60 /* s2, s3, s4, s5, s6, s7, s8, s9, */
61 REG_SAV, REG_SAV, REG_SAV, REG_SAV, REG_SAV, REG_SAV, REG_SAV, REG_SAV,
67 s4 nregdescfloat[] = {
68 /*ftmp3, fa0/v0, fa1, fa2, fa3, fa4, fa5, fa6, */
69 REG_RES, REG_ARG, REG_ARG, REG_ARG, REG_ARG, REG_ARG, REG_ARG, REG_ARG,
71 /* fa7, ft0, ft1, ft2, ft3, ft4, fs0, fs1, */
72 REG_ARG, REG_TMP, REG_TMP, REG_TMP, REG_TMP, REG_TMP, REG_SAV, REG_SAV,
74 /*ftmp1, ftmp2, ft5, ft6, ft7, ft8, ft9, ft10, */
75 REG_RES, REG_RES, REG_TMP, REG_TMP, REG_TMP, REG_TMP, REG_TMP, REG_TMP,
77 /* fs2, fs3, fs4, fs5, fs6, fs7, fs8, fs9 */
78 REG_SAV, REG_SAV, REG_SAV, REG_SAV, REG_SAV, REG_SAV, REG_SAV, REG_SAV,
84 /* md_param_alloc **************************************************************
86 Allocate Arguments to Stackslots according the Calling Conventions
89 md->paramcount: Number of arguments for this method
90 md->paramtypes[].type: Argument types
93 md->params[].inmemory: Argument spilled on stack
94 md->params[].regoff: Stack offset or rd->arg[int|flt]regs index
95 md->memuse: Stackslots needed for argument spilling
96 md->argintreguse: max number of integer arguments used
97 md->argfltreguse: max number of float arguments used
99 *******************************************************************************/
101 void md_param_alloc(methoddesc *md)
109 /* set default values */
113 stacksize = LA_WORD_SIZE;
115 /* get params field of methoddesc */
119 for (i = 0; i < md->paramcount; i++, pd++) {
120 switch (md->paramtypes[i].type) {
123 if (iarg < INT_ARG_CNT) {
124 pd->inmemory = false;
129 pd->regoff = stacksize;
134 if (iarg < INT_ARG_CNT - 1) {
136 pd->inmemory = false;
137 /* rd->arg[int|flt]regs index !! */
138 pd->regoff = PACK_REGS(iarg + 1, iarg);
143 pd->regoff = stacksize;
149 if (farg < FLT_ARG_CNT) {
150 pd->inmemory = false;
155 pd->regoff = stacksize;
160 if (farg < FLT_ARG_CNT) {
161 pd->inmemory = false;
167 pd->regoff = stacksize;
174 /* Since R3/R4, F1 (==A0/A1, A0) are used for passing return values, this */
175 /* argument register usage has to be regarded, too */
176 if (IS_INT_LNG_TYPE(md->returntype.type)) {
177 if (iarg < (IS_2_WORD_TYPE(md->returntype.type) ? 2 : 1))
178 iarg = IS_2_WORD_TYPE(md->returntype.type) ? 2 : 1;
180 if (IS_FLT_DBL_TYPE(md->returntype.type))
185 /* fill register and stack usage */
187 md->argintreguse = iarg;
188 md->argfltreguse = farg;
189 md->memuse = stacksize;
193 /* md_return_alloc *************************************************************
195 Precolor the Java Stackelement containing the Return Value, if
196 possible. (R3==a00 for int/adr, R4/R3 == a01/a00 for long, F1==a00
200 m: Methodinfo of current method
201 return_type: Return Type of the Method (TYPE_INT.. TYPE_ADR)
202 TYPE_VOID is not allowed!
203 stackslot: Java Stackslot to contain the Return Value
206 if precoloring was possible:
207 stackslot->varkind =ARGVAR
210 ->regoff =[REG_RESULT, (REG_RESULT2/REG_RESULT), REG_FRESULT]
211 rd->arg[flt|int]reguse set to a value according the register usage
213 *******************************************************************************/
215 void md_return_alloc(methodinfo *m, registerdata *rd, s4 return_type,
218 /* In Leafmethods Local Vars holding parameters are precolored to their */
219 /* argument register -> so leafmethods with paramcount > 0 could already */
222 if (!m->isleafmethod || (m->paramcount == 0)) {
223 /* Only precolor the stackslot, if it is not a SAVEDVAR <-> has not */
224 /* to survive method invokations */
226 if (!(stackslot->flags & SAVEDVAR)) {
227 stackslot->varkind = ARGVAR;
228 stackslot->varnum = -1;
229 stackslot->flags = 0;
231 if ( IS_INT_LNG_TYPE(return_type) ) {
232 if (!IS_2_WORD_TYPE(return_type)) {
233 if (rd->argintreguse < 1)
234 rd->argintreguse = 1;
236 stackslot->regoff = REG_RESULT;
239 if (rd->argintreguse < 2)
240 rd->argintreguse = 2;
242 stackslot->regoff = PACK_REGS(REG_RESULT2, REG_RESULT);
245 } else { /* float/double */
246 if (rd->argfltreguse < 1)
247 rd->argfltreguse = 1;
249 stackslot->regoff = REG_FRESULT;
257 * These are local overrides for various environment variables in Emacs.
258 * Please do not remove this and leave it at the end of the file, where
259 * Emacs will automagically detect them.
260 * ---------------------------------------------------------------------
263 * indent-tabs-mode: t