src/vm/jit/arm/md-abi.c

   1 /* src/vm/jit/arm/md-abi.c - functions for arm ABI
   2
   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
   7
   8    This file is part of CACAO.
   9
  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.
  14
  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.
  19
  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
  23    02110-1301, USA.
  24
  25    $Id: md-abi.c 7723 2007-04-16 18:03:08Z michi $
  26
  27 */
  28
  29
  30 #include "config.h"
  31 #include "vm/types.h"
  32
  33 #include "vm/jit/arm/md-abi.h"
  34
  35 #include "vm/global.h"
  36
  37 #include "vm/jit/abi.h"
  38
  39 #include "vmcore/descriptor.h"
  40
  41
  42 /* register descripton array **************************************************/
  43
  44 s4 nregdescint[] = {
  45         REG_ARG, REG_ARG, REG_ARG, REG_ARG, REG_SAV, REG_SAV, REG_SAV, REG_SAV,
  46         REG_SAV, REG_RES, REG_RES, REG_RES, REG_RES, REG_RES, REG_RES, REG_RES,
  47         REG_END
  48 };
  49
  50 const char *abi_registers_integer_name[] = {
  51         "a1", "a2", "a3", "a4", "v1", "v2", "v3", "v4",
  52         "v5", "t3", "t1", "t2", "ip", "sp", "lr", "pc",
  53 };
  54
  55 const s4 abi_registers_integer_argument[] = {
  56         0,  /* a0 */
  57         1,  /* a1 */
  58         2,  /* a2 */
  59         3,  /* a3 */
  60         REG_SPLIT,
  61 };
  62
  63 const s4 abi_registers_integer_saved[] = {
  64         4,  /* s0 */
  65         5,  /* s1 */
  66         6,  /* s2 */
  67         7,  /* s3 */
  68         8,  /* s4 */
  69 };
  70
  71 const s4 abi_registers_integer_temporary[] = {
  72         -1,
  73 };
  74
  75
  76 #if defined(ENABLE_SOFTFLOAT)
  77 s4 nregdescfloat[] = {
  78         REG_RES, REG_RES, REG_RES, REG_RES,
  79         REG_RES, REG_RES, REG_RES, REG_RES,
  80         REG_END
  81 };
  82 #else
  83 /* TODO: FPA register usage conventions */
  84 s4 nregdescfloat[] = {
  85         REG_TMP, REG_TMP, REG_TMP, REG_TMP,
  86         REG_TMP, REG_TMP, REG_RES, REG_RES,
  87         REG_END
  88 };
  89 #endif /* defined(ENABLE_SOFTFLOAT) */
  90
  91 const s4 abi_registers_float_argument[] = {
  92         -1,
  93 };
  94
  95 const s4 abi_registers_float_saved[] = {
  96         -1,
  97 };
  98
  99 const s4 abi_registers_float_temporary[] = {
 100 #if defined(ENABLE_SOFTFLOAT)
 101         -1,
 102 #else
 103         0,  /* ft0 */
 104         1,  /* ft1 */
 105         2,  /* ft2 */
 106         3,  /* ft3 */
 107         4,  /* ft4 */
 108         5,  /* ft5 */
 109 #endif
 110 };
 111
 112
 113 /* md_param_alloc **************************************************************
 114
 115    Allocate Arguments to Stackslots according the Calling Conventions
 116
 117    --- in:
 118    md->paramcount:           Number of arguments for this method
 119    md->paramtypes[].type:    Argument types
 120
 121    --- out:
 122    md->params[].inmemory:    Argument spilled on stack
 123    md->params[].regoff:      Stack offset or rd->arg[int|flt]regs index
 124    md->memuse:               Stackslots needed for argument spilling
 125    md->argintreguse:         max number of integer arguments used
 126    md->argfltreguse:         max number of float arguments used
 127
 128 *******************************************************************************/
 129
 130 void md_param_alloc(methoddesc *md)
 131 {
 132         paramdesc *pd;
 133         s4         i;
 134         s4         reguse;
 135         s4         stacksize;
 136
 137         /* set default values */
 138         reguse = 0;
 139         stacksize = 0;
 140
 141         /* get params field of methoddesc */
 142         pd = md->params;
 143
 144         for (i = 0; i < md->paramcount; i++, pd++) {
 145                 switch (md->paramtypes[i].type) {
 146                 case TYPE_INT:
 147                 case TYPE_ADR:
 148                 case TYPE_FLT:
 149                         if (reguse < INT_ARG_CNT) {
 150                                 pd->inmemory = false;
 151                                 pd->regoff   = abi_registers_integer_argument[reguse];
 152                                 reguse++;
 153                         }
 154                         else {
 155                                 pd->inmemory = true;
 156                                 pd->regoff   = stacksize;
 157                                 stacksize++;
 158                         }
 159                         break;
 160
 161                 case TYPE_LNG:
 162                 case TYPE_DBL:
 163                         if (reguse+1 < INT_ARG_CNT) {
 164                                 pd->inmemory = false;
 165 #if defined(__ARMEL__)
 166                                 pd->regoff   =
 167                                         PACK_REGS(abi_registers_integer_argument[reguse],
 168                                                           abi_registers_integer_argument[reguse + 1]);
 169 #else
 170                                 pd->regoff   =
 171                                         PACK_REGS(abi_registers_integer_argument[reguse + 1],
 172                                                           abi_registers_integer_argument[reguse]);
 173 #endif
 174                                 reguse += 2;
 175                         }
 176                         else if (reguse < INT_ARG_CNT) {
 177                                 pd->inmemory = false;
 178 #if defined(__ARMEL__)
 179                                 pd->regoff   =
 180                                         PACK_REGS(abi_registers_integer_argument[reguse],
 181                                                           abi_registers_integer_argument[INT_ARG_CNT]);
 182 #else
 183                                 pd->regoff   =
 184                                         PACK_REGS(abi_registers_integer_argument[INT_ARG_CNT],
 185                                                           abi_registers_integer_argument[reguse]);
 186 #endif
 187                                 reguse++;
 188                                 stacksize++;
 189                         }
 190                         else {
 191                                 pd->inmemory = true;
 192                                 pd->regoff   = stacksize;
 193                                 stacksize += 2;
 194                         }
 195                         break;
 196                 }
 197         }
 198
 199         /* Since R0/R1 (==A0/A1) are used for passing return values, this
 200            argument register usage has to be regarded, too. */
 201
 202         if (md->returntype.type != TYPE_VOID) {
 203                 if (!IS_2_WORD_TYPE(md->returntype.type)) {
 204                         if (reguse < 1)
 205                                 reguse = 1;
 206                 }
 207                 else {
 208                         if (reguse < 2)
 209                                 reguse = 2;
 210                 }
 211         }
 212
 213         /* fill register and stack usage */
 214
 215         md->argintreguse = reguse;
 216         md->argfltreguse = 0;
 217         md->memuse       = stacksize;
 218 }
 219
 220
 221 /* md_param_alloc_native *******************************************************
 222
 223    Pre-allocate arguments according the native ABI.
 224
 225 *******************************************************************************/
 226
 227 #define ALIGN_2(a)    do { if ((a) & 0x1) (a)++; } while (0)
 228
 229 void md_param_alloc_native(methoddesc *md)
 230 {
 231         paramdesc *pd;
 232         s4         i;
 233         s4         reguse;
 234         s4         stacksize;
 235
 236         /* set default values */
 237
 238         reguse    = 0;
 239         stacksize = 0;
 240
 241         /* get params field of methoddesc */
 242
 243         pd = md->params;
 244
 245         for (i = 0; i < md->paramcount; i++, pd++) {
 246                 switch (md->paramtypes[i].type) {
 247                 case TYPE_INT:
 248                 case TYPE_ADR:
 249                 case TYPE_FLT:
 250                         if (reguse < INT_ARG_CNT) {
 251                                 pd->inmemory = false;
 252                                 pd->regoff   = abi_registers_integer_argument[reguse];
 253                                 reguse++;
 254                         }
 255                         else {
 256                                 pd->inmemory = true;
 257                                 pd->regoff   = stacksize;
 258                                 stacksize++;
 259                         }
 260                         break;
 261
 262                 case TYPE_LNG:
 263                 case TYPE_DBL:
 264                         if (reguse < (INT_ARG_CNT - 1)) {
 265 #if defined(__ARM_EABI__)
 266                                 ALIGN_2(reguse);
 267 #endif
 268                                 pd->inmemory = false;
 269 #if defined(__ARMEL__)
 270                                 pd->regoff   =
 271                                         PACK_REGS(abi_registers_integer_argument[reguse],
 272                                                           abi_registers_integer_argument[reguse + 1]);
 273 #else
 274                                 pd->regoff   =
 275                                         PACK_REGS(abi_registers_integer_argument[reguse + 1],
 276                                                           abi_registers_integer_argument[reguse]);
 277 #endif
 278                                 reguse += 2;
 279                         }
 280 #if !defined(__ARM_EABI__)
 281                         else if (reguse < INT_ARG_CNT) {
 282                                 pd->inmemory = false;
 283 # if defined(__ARMEL__)
 284                                 pd->regoff   =
 285                                         PACK_REGS(abi_registers_integer_argument[reguse],
 286                                                           abi_registers_integer_argument[INT_ARG_CNT]);
 287 # else
 288                                 pd->regoff   =
 289                                         PACK_REGS(abi_registers_integer_argument[INT_ARG_CNT],
 290                                                           abi_registers_integer_argument[reguse]);
 291 # endif
 292                                 reguse++;
 293                                 stacksize++;
 294                         }
 295 #endif
 296                         else {
 297 #if defined(__ARM_EABI__)
 298                                 ALIGN_2(stacksize);
 299 #endif
 300                                 pd->inmemory  = true;
 301                                 pd->regoff    = stacksize;
 302                                 reguse        = INT_ARG_CNT;
 303                                 stacksize    += 2;
 304                         }
 305                         break;
 306                 }
 307         }
 308
 309         /* Since R0/R1 (==A0/A1) are used for passing return values, this
 310            argument register usage has to be regarded, too. */
 311
 312         if (md->returntype.type != TYPE_VOID) {
 313                 if (!IS_2_WORD_TYPE(md->returntype.type)) {
 314                         if (reguse < 1)
 315                                 reguse = 1;
 316                 }
 317                 else {
 318                         if (reguse < 2)
 319                                 reguse = 2;
 320                 }
 321         }
 322
 323         /* fill register and stack usage */
 324
 325         md->argintreguse = reguse;
 326         md->argfltreguse = 0;
 327         md->memuse       = stacksize;
 328 }
 329
 330
 331 /* md_return_alloc *************************************************************
 332
 333    Precolor the Java Stackelement containing the Return Value, if possible.
 334
 335    --- in
 336    m:                       Methodinfo of current method
 337    return_type:             Return Type of the Method (TYPE_INT.. TYPE_ADR)
 338                             TYPE_VOID is not allowed!
 339    stackslot:               Java Stackslot to contain the Return Value
 340
 341    --- out
 342    if precoloring was possible:
 343    VAR(stackslot->varnum)->flags = PREALLOC
 344    VAR(stackslot->varnum)->vv.regoff = [REG_RESULT, (REG_RESULT2/REG_RESULT), REG_FRESULT]
 345    rd->arg[flt|int]reguse   set to a value according the register usage
 346
 347 *******************************************************************************/
 348
 349 void md_return_alloc(jitdata *jd, stackptr stackslot)
 350 {
 351         methodinfo   *m;
 352         registerdata *rd;
 353         methoddesc   *md;
 354
 355         /* get required compiler data */
 356
 357         m  = jd->m;
 358         rd = jd->rd;
 359
 360         md = m->parseddesc;
 361
 362         /* In Leafmethods Local Vars holding parameters are precolored to
 363            their argument register -> so leafmethods with paramcount > 0
 364            could already use R0 == a00! */
 365
 366         if (!jd->isleafmethod || (md->paramcount == 0)) {
 367                 /* Only precolor the stackslot, if it is not a SAVEDVAR <->
 368                    has not to survive method invokations. */
 369
 370                 if (!(stackslot->flags & SAVEDVAR)) {
 371 #if !defined(ENABLE_SOFTFLOAT)
 372                         /* Stackelements containing float or double values
 373                            (TYPE_FLT | TYPE_DBL) cannot be precolored, because we
 374                            use integer register to pass return values. (floats:
 375                            R0, doubles: R0/R1) */
 376
 377                         if (!IS_FLT_DBL_TYPE(md->returntype.type)) {
 378 #endif
 379
 380                                 VAR(stackslot->varnum)->flags = PREALLOC;
 381
 382                                 if (!IS_2_WORD_TYPE(md->returntype.type)) {
 383                                         if (rd->argintreguse < 1)
 384                                                 rd->argintreguse = 1;
 385
 386                                         VAR(stackslot->varnum)->vv.regoff = REG_RESULT;
 387                                 }
 388                                 else {
 389                                         if (rd->argintreguse < 2)
 390                                                 rd->argintreguse = 2;
 391
 392                                         VAR(stackslot->varnum)->vv.regoff = REG_RESULT_PACKED;
 393                                 }
 394
 395 #if !defined(ENABLE_SOFTFLOAT)
 396                         }
 397 #endif
 398                 }
 399         }
 400 }
 401
 402
 403 /*
 404  * These are local overrides for various environment variables in Emacs.
 405  * Please do not remove this and leave it at the end of the file, where
 406  * Emacs will automagically detect them.
 407  * ---------------------------------------------------------------------
 408  * Local variables:
 409  * mode: c
 410  * indent-tabs-mode: t
 411  * c-basic-offset: 4
 412  * tab-width: 4
 413  * End:
 414  */