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/global.h"
33 #include "vm/jit/abi.h"
35 #include "vmcore/descriptor.h"
38 /* register descripton array **************************************************/
41 REG_ARG, REG_ARG, REG_ARG, REG_ARG, REG_SAV, REG_SAV, REG_SAV, REG_SAV,
42 REG_SAV, REG_RES, REG_RES, REG_RES, REG_RES, REG_RES, REG_RES, REG_RES,
46 const char *abi_registers_integer_name[] = {
47 "a1", "a2", "a3", "a4", "v1", "v2", "v3", "v4",
48 "v5", "t3", "t1", "t2", "ip", "sp", "lr", "pc",
51 const s4 abi_registers_integer_argument[] = {
59 const s4 abi_registers_integer_saved[] = {
67 const s4 abi_registers_integer_temporary[] = {
72 #if defined(ENABLE_SOFTFLOAT)
73 s4 nregdescfloat[] = {
74 REG_RES, REG_RES, REG_RES, REG_RES,
75 REG_RES, REG_RES, REG_RES, REG_RES,
79 /* TODO: FPA register usage conventions */
80 s4 nregdescfloat[] = {
81 REG_TMP, REG_TMP, REG_TMP, REG_TMP,
82 REG_TMP, REG_TMP, REG_RES, REG_RES,
85 #endif /* defined(ENABLE_SOFTFLOAT) */
87 const s4 abi_registers_float_argument[] = {
91 const s4 abi_registers_float_saved[] = {
95 const s4 abi_registers_float_temporary[] = {
96 #if defined(ENABLE_SOFTFLOAT)
109 /* md_param_alloc **************************************************************
111 Allocate Arguments to Stackslots according the Calling Conventions
114 md->paramcount: Number of arguments for this method
115 md->paramtypes[].type: Argument types
118 md->params[].inmemory: Argument spilled on stack
119 md->params[].regoff: Stack offset or rd->arg[int|flt]regs index
120 md->memuse: Stackslots needed for argument spilling
121 md->argintreguse: max number of integer arguments used
122 md->argfltreguse: max number of float arguments used
124 *******************************************************************************/
126 void md_param_alloc(methoddesc *md)
133 /* set default values */
138 /* get params field of methoddesc */
142 for (i = 0; i < md->paramcount; i++, pd++) {
143 switch (md->paramtypes[i].type) {
147 if (reguse < INT_ARG_CNT) {
148 pd->inmemory = false;
150 pd->regoff = abi_registers_integer_argument[reguse];
155 pd->index = stacksize;
156 pd->regoff = stacksize * 8;
163 /* interally we use the EABI */
167 if (reguse < INT_ARG_CNT) {
168 pd->inmemory = false;
169 #if defined(__ARMEL__)
170 pd->index = PACK_REGS(reguse, reguse + 1);
172 PACK_REGS(abi_registers_integer_argument[reguse],
173 abi_registers_integer_argument[reguse + 1]);
175 pd->index = PACK_REGS(reguse + 1, reguse);
177 PACK_REGS(abi_registers_integer_argument[reguse + 1],
178 abi_registers_integer_argument[reguse]);
184 /*ALIGN_2(stacksize);*/
187 pd->index = stacksize;
188 pd->regoff = stacksize * 8;
196 /* Since R0/R1 (==A0/A1) are used for passing return values, this
197 argument register usage has to be regarded, too. */
199 if (md->returntype.type != TYPE_VOID) {
200 if (!IS_2_WORD_TYPE(md->returntype.type)) {
210 /* fill register and stack usage */
212 md->argintreguse = reguse;
213 md->argfltreguse = 0;
214 md->memuse = stacksize;
218 /* md_param_alloc_native *******************************************************
220 Pre-allocate arguments according the native ABI.
222 *******************************************************************************/
224 void md_param_alloc_native(methoddesc *md)
231 /* set default values */
236 /* get params field of methoddesc */
240 for (i = 0; i < md->paramcount; i++, pd++) {
241 switch (md->paramtypes[i].type) {
245 if (reguse < INT_ARG_CNT) {
246 pd->inmemory = false;
248 pd->regoff = abi_registers_integer_argument[reguse];
254 pd->regoff = stacksize * 4;
261 if (reguse < (INT_ARG_CNT - 1)) {
262 #if defined(__ARM_EABI__)
265 pd->inmemory = false;
266 #if defined(__ARMEL__)
269 PACK_REGS(abi_registers_integer_argument[reguse],
270 abi_registers_integer_argument[reguse + 1]);
274 PACK_REGS(abi_registers_integer_argument[reguse + 1],
275 abi_registers_integer_argument[reguse]);
279 #if !defined(__ARM_EABI__)
280 else if (reguse < INT_ARG_CNT) {
281 pd->inmemory = false;
282 # if defined(__ARMEL__)
285 PACK_REGS(abi_registers_integer_argument[reguse],
286 abi_registers_integer_argument[INT_ARG_CNT]);
290 PACK_REGS(abi_registers_integer_argument[INT_ARG_CNT],
291 abi_registers_integer_argument[reguse]);
298 #if defined(__ARM_EABI__)
303 pd->regoff = stacksize * 4;
304 reguse = INT_ARG_CNT;
311 /* Since R0/R1 (==A0/A1) are used for passing return values, this
312 argument register usage has to be regarded, too. */
314 if (md->returntype.type != TYPE_VOID) {
315 if (!IS_2_WORD_TYPE(md->returntype.type)) {
325 /* fill register and stack usage */
327 md->argintreguse = reguse;
328 md->argfltreguse = 0;
329 md->memuse = stacksize;
333 /* md_return_alloc *************************************************************
335 Precolor the Java Stackelement containing the Return Value, if possible.
338 m: Methodinfo of current method
339 return_type: Return Type of the Method (TYPE_INT.. TYPE_ADR)
340 TYPE_VOID is not allowed!
341 stackslot: Java Stackslot to contain the Return Value
344 if precoloring was possible:
345 VAR(stackslot->varnum)->flags = PREALLOC
346 VAR(stackslot->varnum)->vv.regoff = [REG_RESULT, (REG_RESULT2/REG_RESULT), REG_FRESULT]
347 rd->arg[flt|int]reguse set to a value according the register usage
349 *******************************************************************************/
351 void md_return_alloc(jitdata *jd, stackelement_t *stackslot)
358 /* get required compiler data */
366 /* In Leafmethods Local Vars holding parameters are precolored to
367 their argument register -> so leafmethods with paramcount > 0
368 could already use R0 == a00! */
370 if (!code_is_leafmethod(code) || (md->paramcount == 0)) {
371 /* Only precolor the stackslot, if it is not a SAVEDVAR <->
372 has not to survive method invokations. */
374 if (!(stackslot->flags & SAVEDVAR)) {
375 #if !defined(ENABLE_SOFTFLOAT)
376 /* Stackelements containing float or double values
377 (TYPE_FLT | TYPE_DBL) cannot be precolored, because we
378 use integer register to pass return values. (floats:
379 R0, doubles: R0/R1) */
381 if (!IS_FLT_DBL_TYPE(md->returntype.type)) {
384 VAR(stackslot->varnum)->flags = PREALLOC;
386 if (!IS_2_WORD_TYPE(md->returntype.type)) {
387 if (rd->argintreguse < 1)
388 rd->argintreguse = 1;
390 VAR(stackslot->varnum)->vv.regoff = REG_RESULT;
393 if (rd->argintreguse < 2)
394 rd->argintreguse = 2;
396 VAR(stackslot->varnum)->vv.regoff = REG_RESULT_PACKED;
399 #if !defined(ENABLE_SOFTFLOAT)
408 * These are local overrides for various environment variables in Emacs.
409 * Please do not remove this and leave it at the end of the file, where
410 * Emacs will automagically detect them.
411 * ---------------------------------------------------------------------
414 * indent-tabs-mode: t