1 /* src/vm/jit/arm/md-abi.c - functions for arm ABI
3 Copyright (C) 1996-2005, 2006, 2007, 2008
4 CACAOVM - Verein zur Foerderung der freien virtuellen Maschine CACAO
6 This file is part of CACAO.
8 This program is free software; you can redistribute it and/or
9 modify it under the terms of the GNU General Public License as
10 published by the Free Software Foundation; either version 2, or (at
11 your option) any later version.
13 This program is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
29 #include "vm/jit/arm/md-abi.h"
31 #include "vm/descriptor.hpp"
32 #include "vm/global.h"
34 #include "vm/jit/abi.h"
37 /* register descripton array **************************************************/
40 REG_ARG, REG_ARG, REG_ARG, REG_ARG, REG_SAV, REG_SAV, REG_SAV, REG_SAV,
41 REG_SAV, REG_RES, REG_RES, REG_RES, REG_RES, REG_RES, REG_RES, REG_RES,
45 const char *abi_registers_integer_name[] = {
46 "a1", "a2", "a3", "a4", "v1", "v2", "v3", "v4",
47 "v5", "t3", "t1", "t2", "ip", "sp", "lr", "pc",
50 const s4 abi_registers_integer_argument[] = {
58 const s4 abi_registers_integer_saved[] = {
66 const s4 abi_registers_integer_temporary[] = {
71 #if defined(ENABLE_SOFTFLOAT)
72 s4 nregdescfloat[] = {
73 REG_RES, REG_RES, REG_RES, REG_RES,
74 REG_RES, REG_RES, REG_RES, REG_RES,
78 /* TODO: FPA register usage conventions */
79 s4 nregdescfloat[] = {
80 REG_TMP, REG_TMP, REG_TMP, REG_TMP,
81 REG_TMP, REG_TMP, REG_RES, REG_RES,
84 #endif /* defined(ENABLE_SOFTFLOAT) */
86 const s4 abi_registers_float_argument[] = {
90 const s4 abi_registers_float_saved[] = {
94 const s4 abi_registers_float_temporary[] = {
95 #if defined(ENABLE_SOFTFLOAT)
108 /* md_param_alloc **************************************************************
110 Allocate Arguments to Stackslots according the Calling Conventions
113 md->paramcount: Number of arguments for this method
114 md->paramtypes[].type: Argument types
117 md->params[].inmemory: Argument spilled on stack
118 md->params[].regoff: Stack offset or rd->arg[int|flt]regs index
119 md->memuse: Stackslots needed for argument spilling
120 md->argintreguse: max number of integer arguments used
121 md->argfltreguse: max number of float arguments used
123 *******************************************************************************/
125 void md_param_alloc(methoddesc *md)
132 /* set default values */
137 /* get params field of methoddesc */
141 for (i = 0; i < md->paramcount; i++, pd++) {
142 switch (md->paramtypes[i].type) {
146 if (reguse < INT_ARG_CNT) {
147 pd->inmemory = false;
149 pd->regoff = abi_registers_integer_argument[reguse];
154 pd->index = stacksize;
155 pd->regoff = stacksize * 8;
162 /* interally we use the EABI */
166 if (reguse < INT_ARG_CNT) {
167 pd->inmemory = false;
168 #if defined(__ARMEL__)
169 pd->index = PACK_REGS(reguse, reguse + 1);
171 PACK_REGS(abi_registers_integer_argument[reguse],
172 abi_registers_integer_argument[reguse + 1]);
174 pd->index = PACK_REGS(reguse + 1, reguse);
176 PACK_REGS(abi_registers_integer_argument[reguse + 1],
177 abi_registers_integer_argument[reguse]);
183 /*ALIGN_2(stacksize);*/
186 pd->index = stacksize;
187 pd->regoff = stacksize * 8;
195 /* Since R0/R1 (==A0/A1) are used for passing return values, this
196 argument register usage has to be regarded, too. */
198 if (md->returntype.type != TYPE_VOID) {
199 if (!IS_2_WORD_TYPE(md->returntype.type)) {
209 /* fill register and stack usage */
211 md->argintreguse = reguse;
212 md->argfltreguse = 0;
213 md->memuse = stacksize;
217 /* md_param_alloc_native *******************************************************
219 Pre-allocate arguments according the native ABI.
221 *******************************************************************************/
223 void md_param_alloc_native(methoddesc *md)
230 /* set default values */
235 /* get params field of methoddesc */
239 for (i = 0; i < md->paramcount; i++, pd++) {
240 switch (md->paramtypes[i].type) {
244 if (reguse < INT_ARG_CNT) {
245 pd->inmemory = false;
247 pd->regoff = abi_registers_integer_argument[reguse];
253 pd->regoff = stacksize * 4;
260 if (reguse < (INT_ARG_CNT - 1)) {
261 #if defined(__ARM_EABI__)
264 pd->inmemory = false;
265 #if defined(__ARMEL__)
268 PACK_REGS(abi_registers_integer_argument[reguse],
269 abi_registers_integer_argument[reguse + 1]);
273 PACK_REGS(abi_registers_integer_argument[reguse + 1],
274 abi_registers_integer_argument[reguse]);
278 #if !defined(__ARM_EABI__)
279 else if (reguse < INT_ARG_CNT) {
280 pd->inmemory = false;
281 # if defined(__ARMEL__)
284 PACK_REGS(abi_registers_integer_argument[reguse],
285 abi_registers_integer_argument[INT_ARG_CNT]);
289 PACK_REGS(abi_registers_integer_argument[INT_ARG_CNT],
290 abi_registers_integer_argument[reguse]);
297 #if defined(__ARM_EABI__)
302 pd->regoff = stacksize * 4;
303 reguse = INT_ARG_CNT;
310 /* Since R0/R1 (==A0/A1) are used for passing return values, this
311 argument register usage has to be regarded, too. */
313 if (md->returntype.type != TYPE_VOID) {
314 if (!IS_2_WORD_TYPE(md->returntype.type)) {
324 /* fill register and stack usage */
326 md->argintreguse = reguse;
327 md->argfltreguse = 0;
328 md->memuse = stacksize;
332 /* md_return_alloc *************************************************************
334 Precolor the Java Stackelement containing the Return Value, if possible.
337 m: Methodinfo of current method
338 return_type: Return Type of the Method (TYPE_INT.. TYPE_ADR)
339 TYPE_VOID is not allowed!
340 stackslot: Java Stackslot to contain the Return Value
343 if precoloring was possible:
344 VAR(stackslot->varnum)->flags = PREALLOC
345 VAR(stackslot->varnum)->vv.regoff = [REG_RESULT, (REG_RESULT2/REG_RESULT), REG_FRESULT]
346 rd->arg[flt|int]reguse set to a value according the register usage
348 *******************************************************************************/
350 void md_return_alloc(jitdata *jd, stackelement_t *stackslot)
357 /* get required compiler data */
365 /* In Leafmethods Local Vars holding parameters are precolored to
366 their argument register -> so leafmethods with paramcount > 0
367 could already use R0 == a00! */
369 if (!code_is_leafmethod(code) || (md->paramcount == 0)) {
370 /* Only precolor the stackslot, if it is not a SAVEDVAR <->
371 has not to survive method invokations. */
373 if (!(stackslot->flags & SAVEDVAR)) {
374 #if !defined(ENABLE_SOFTFLOAT)
375 /* Stackelements containing float or double values
376 (TYPE_FLT | TYPE_DBL) cannot be precolored, because we
377 use integer register to pass return values. (floats:
378 R0, doubles: R0/R1) */
380 if (!IS_FLT_DBL_TYPE(md->returntype.type)) {
383 VAR(stackslot->varnum)->flags = PREALLOC;
385 if (!IS_2_WORD_TYPE(md->returntype.type)) {
386 if (rd->argintreguse < 1)
387 rd->argintreguse = 1;
389 VAR(stackslot->varnum)->vv.regoff = REG_RESULT;
392 if (rd->argintreguse < 2)
393 rd->argintreguse = 2;
395 VAR(stackslot->varnum)->vv.regoff = REG_RESULT_PACKED;
398 #if !defined(ENABLE_SOFTFLOAT)
407 * These are local overrides for various environment variables in Emacs.
408 * Please do not remove this and leave it at the end of the file, where
409 * Emacs will automagically detect them.
410 * ---------------------------------------------------------------------
413 * indent-tabs-mode: t