src/vm/jit/powerpc/darwin/md-abi.c

   1 /* src/vm/jit/powerpc/darwin/md-abi.c - PowerPC Darwin ABI
   2
   3    Copyright (C) 1996-2005, 2006, 2007, 2008
   4    CACAOVM - Verein zur Foerderung der freien virtuellen Maschine CACAO
   5
   6    This file is part of CACAO.
   7
   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.
  12
  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.
  17
  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
  21    02110-1301, USA.
  22
  23 */
  24
  25
  26 #include "config.h"
  27
  28 #include <stdint.h>
  29
  30 #include "vm/jit/powerpc/darwin/md-abi.h"
  31
  32 #include "vm/descriptor.hpp"
  33 #include "vm/global.h"
  34
  35 #include "vm/jit/abi.h"
  36 #include "vm/jit/stack.h"
  37
  38
  39 /* register descripton arrays *************************************************/
  40
  41 int nregdescint[] = {
  42         /* zero,      sp,      t0,   a0/v0,   a0/v1,      a2,      a3,      a4,   */
  43         REG_RES, REG_RES, REG_TMP, REG_ARG, REG_ARG, REG_ARG, REG_ARG, REG_ARG,
  44
  45         /*   a5,      a6,      a7,   itmp1,   itmp2,      pv,      s0,      s1,   */
  46         REG_ARG, REG_ARG, REG_ARG, REG_RES, REG_RES, REG_RES, REG_SAV, REG_SAV,
  47
  48         /*itmp3,      t1,      t2,      t3,      t4,      t5,      t6,      t7,   */
  49         REG_RES, REG_TMP, REG_TMP, REG_TMP, REG_TMP, REG_TMP, REG_TMP, REG_TMP,
  50
  51         /*   s2,      s3,      s4,      s5,      s6,      s7,      s8,      s9,   */
  52         REG_SAV, REG_SAV, REG_SAV, REG_SAV, REG_SAV, REG_SAV, REG_SAV, REG_SAV,
  53
  54         REG_END
  55 };
  56
  57 const char *abi_registers_integer_name[] = {
  58         "r0",  "r1",  "r2",  "r3",  "r4",  "r5",  "r6",  "r7",
  59         "r8",  "r9",  "r10", "r11", "r12", "r13", "r14", "r15",
  60         "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
  61         "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",
  62 };
  63
  64 const int abi_registers_integer_argument[] = {
  65         3,  /* a0 */
  66         4,  /* a1 */
  67         5,  /* a2 */
  68         6,  /* a3 */
  69         7,  /* a4 */
  70         8,  /* a5 */
  71         9,  /* a6 */
  72         10, /* a7 */
  73 };
  74
  75 const int abi_registers_integer_saved[] = {
  76         14, /* s0 */
  77         15, /* s1 */
  78         24, /* s2 */
  79         25, /* s3 */
  80         26, /* s4 */
  81         27, /* s5 */
  82         28, /* s6 */
  83         29, /* s7 */
  84         30, /* s8 */
  85         31, /* s9 */
  86 };
  87
  88 const int abi_registers_integer_temporary[] = {
  89         2,  /* t0 */
  90         17, /* t1 */
  91         18, /* t2 */
  92         19, /* t3 */
  93         20, /* t4 */
  94         21, /* t5 */
  95         22, /* t6 */
  96         23, /* t7 */
  97 };
  98
  99
 100 int nregdescfloat[] = {
 101         /*ftmp3,  fa0/v0,     fa1,     fa2,     fa3,     fa4,     fa5,     fa6,   */
 102         REG_RES, REG_ARG, REG_ARG, REG_ARG, REG_ARG, REG_ARG, REG_ARG, REG_ARG,
 103
 104         /*  fa7,     fa8,     fa9,    fa10,    fa11,    fa12,     fs0,     fs1,   */
 105         REG_ARG, REG_ARG, REG_ARG, REG_ARG, REG_ARG, REG_ARG, REG_SAV, REG_SAV,
 106
 107         /*ftmp1,   ftmp2,     ft0,     ft1,     ft2,     ft3,     ft4,     ft5,   */
 108         REG_RES, REG_RES, REG_TMP, REG_TMP, REG_TMP, REG_TMP, REG_TMP, REG_TMP,
 109
 110         /*  fs2,     fs3,     fs4,     fs5,     fs6,     fs7,     fs8,     fs9    */
 111         REG_SAV, REG_SAV, REG_SAV, REG_SAV, REG_SAV, REG_SAV, REG_SAV, REG_SAV,
 112
 113         REG_END
 114 };
 115
 116 const int abi_registers_float_argument[] = {
 117         1,  /* fa0  */
 118         2,  /* fa1  */
 119         3,  /* fa2  */
 120         4,  /* fa3  */
 121         5,  /* fa4  */
 122         6,  /* fa5  */
 123         7,  /* fa6  */
 124         8,  /* fa7  */
 125         9,  /* fa8  */
 126         10, /* fa9  */
 127         11, /* fa10 */
 128         12, /* fa11 */
 129         13, /* fa12 */
 130 };
 131
 132 const int abi_registers_float_saved[] = {
 133         14, /* fs0  */
 134         15, /* fs1  */
 135         24, /* fs2  */
 136         25, /* fs3  */
 137         26, /* fs4  */
 138         27, /* fs5  */
 139         28, /* fs6  */
 140         29, /* fs7  */
 141         30, /* fs8  */
 142         31, /* fs9  */
 143 };
 144
 145 const int abi_registers_float_temporary[] = {
 146         17, /* ft5  */
 147         18, /* ft6  */
 148         19, /* ft7  */
 149         20, /* ft8  */
 150         21, /* ft9  */
 151         22, /* ft10 */
 152         23, /* ft11 */
 153 };
 154
 155
 156 /* md_param_alloc **************************************************************
 157
 158    Allocate Arguments to Stackslots according the Calling Conventions
 159
 160    --- in
 161    md->paramcount:           Number of arguments for this method
 162    md->paramtypes[].type:    Argument types
 163
 164    --- out
 165    md->params[].inmemory:    Argument spilled on stack
 166    md->params[].regoff:      Stack offset or rd->arg[int|flt]regs index
 167    md->memuse:               Stackslots needed for argument spilling
 168    md->argintreguse:         max number of integer arguments used
 169    md->argfltreguse:         max number of float arguments used
 170
 171 *******************************************************************************/
 172
 173 void md_param_alloc(methoddesc *md)
 174 {
 175         paramdesc *pd;
 176         int        i;
 177         int        iarg;
 178         int        farg;
 179         int        stacksize;
 180
 181         /* set default values */
 182
 183         iarg      = 0;
 184         farg      = 0;
 185         stacksize = LA_SIZE_IN_POINTERS;
 186
 187         /* get params field of methoddesc */
 188
 189         pd = md->params;
 190
 191         for (i = 0; i < md->paramcount; i++, pd++) {
 192                 switch (md->paramtypes[i].type) {
 193                 case TYPE_INT:
 194                 case TYPE_ADR:
 195                         if (iarg < INT_ARG_CNT) {
 196                                 pd->inmemory = false;
 197                                 pd->index    = iarg;
 198                                 pd->regoff   = abi_registers_integer_argument[iarg];
 199                                 iarg++;
 200                         }
 201                         else {
 202                                 pd->inmemory = true;
 203                                 pd->index    = stacksize;
 204                                 pd->regoff   = stacksize * 8;
 205                                 stacksize++;
 206                         }
 207                         break;
 208
 209                 case TYPE_LNG:
 210                         if (iarg < INT_ARG_CNT - 1) {
 211                                 pd->inmemory = false;
 212                                 pd->index    = PACK_REGS(iarg + 1, iarg);
 213                                 pd->regoff   =
 214                                         PACK_REGS(abi_registers_integer_argument[iarg + 1],
 215                                                           abi_registers_integer_argument[iarg]);
 216                                 iarg += 2;
 217                         }
 218                         else {
 219                                 pd->inmemory = true;
 220                                 pd->index    = stacksize;
 221                                 pd->regoff   = stacksize * 8;
 222                                 iarg         = INT_ARG_CNT;
 223                                 stacksize++;
 224                         }
 225                         break;
 226
 227                 case TYPE_FLT:
 228                 case TYPE_DBL:
 229                         if (farg < FLT_ARG_CNT) {
 230                                 pd->inmemory = false;
 231                                 pd->index    = farg;
 232                                 pd->regoff   = abi_registers_float_argument[farg];
 233                                 farg++;
 234                         }
 235                         else {
 236                                 pd->inmemory = true;
 237                                 pd->index    = stacksize;
 238                                 pd->regoff   = stacksize * 8;
 239                                 stacksize++;
 240                         }
 241                         break;
 242                 }
 243         }
 244
 245
 246         /* Since R3/R4, F1 (==A0/A1, A0) are used for passing return values, this */
 247         /* argument register usage has to be regarded, too                        */
 248
 249         if (IS_INT_LNG_TYPE(md->returntype.type)) {
 250                 if (iarg < (IS_2_WORD_TYPE(md->returntype.type) ? 2 : 1))
 251                         iarg = IS_2_WORD_TYPE(md->returntype.type) ? 2 : 1;
 252         }
 253         else {
 254                 if (IS_FLT_DBL_TYPE(md->returntype.type))
 255                         if (farg < 1)
 256                                 farg = 1;
 257         }
 258
 259         /* fill register and stack usage */
 260
 261         md->argintreguse = iarg;
 262         md->argfltreguse = farg;
 263         md->memuse       = stacksize;
 264 }
 265
 266
 267 /* md_param_alloc_native *******************************************************
 268
 269    Pre-allocate arguments according the native ABI.
 270
 271 *******************************************************************************/
 272
 273 void md_param_alloc_native(methoddesc *md)
 274 {
 275         paramdesc *pd;
 276         int        i;
 277         int        iarg;
 278         int        farg;
 279         int        stacksize;
 280
 281         /* set default values */
 282
 283         iarg      = 0;
 284         farg      = 0;
 285         stacksize = LA_SIZE_IN_POINTERS;
 286
 287         /* get params field of methoddesc */
 288
 289         pd = md->params;
 290
 291         for (i = 0; i < md->paramcount; i++, pd++) {
 292                 switch (md->paramtypes[i].type) {
 293                 case TYPE_INT:
 294                 case TYPE_ADR:
 295                         if (iarg < INT_ARG_CNT) {
 296                                 pd->inmemory = false;
 297                                 pd->regoff   = abi_registers_integer_argument[iarg];
 298                                 iarg++;
 299                         }
 300                         else {
 301                                 pd->inmemory = true;
 302                                 pd->regoff   = stacksize * 4;
 303                         }
 304                         stacksize++;
 305                         break;
 306
 307                 case TYPE_LNG:
 308                         if (iarg < INT_ARG_CNT - 1) {
 309                                 pd->inmemory = false;
 310                                 pd->regoff   =
 311                                         PACK_REGS(abi_registers_integer_argument[iarg + 1],
 312                                                           abi_registers_integer_argument[iarg]);
 313                                 iarg += 2;
 314                         }
 315                         else {
 316                                 pd->inmemory = true;
 317                                 pd->regoff   = stacksize * 4;
 318                                 iarg         = INT_ARG_CNT;
 319                         }
 320                         stacksize += 2;
 321                         break;
 322
 323                 case TYPE_FLT:
 324                         if (farg < FLT_ARG_CNT) {
 325                                 pd->inmemory = false;
 326                                 pd->regoff   = abi_registers_float_argument[farg];
 327                                 iarg++;                   /* skip 1 integer argument register */
 328                                 farg++;
 329                         }
 330                         else {
 331                                 pd->inmemory = true;
 332                                 pd->regoff   = stacksize * 4;
 333                         }
 334                         stacksize++;
 335                         break;
 336
 337                 case TYPE_DBL:
 338                         if (farg < FLT_ARG_CNT) {
 339                                 pd->inmemory = false;
 340                                 pd->regoff   = abi_registers_float_argument[farg];
 341                                 iarg += 2;               /* skip 2 integer argument registers */
 342                                 farg++;
 343                         }
 344                         else {
 345                                 pd->inmemory = true;
 346                                 pd->regoff   = stacksize * 4;
 347                         }
 348                         stacksize += 2;
 349                         break;
 350                 }
 351         }
 352
 353
 354         /* Since R3/R4, F1 (==A0/A1, A0) are used for passing return values, this */
 355         /* argument register usage has to be regarded, too                        */
 356
 357         if (IS_INT_LNG_TYPE(md->returntype.type)) {
 358                 if (iarg < (IS_2_WORD_TYPE(md->returntype.type) ? 2 : 1))
 359                         iarg = IS_2_WORD_TYPE(md->returntype.type) ? 2 : 1;
 360         }
 361         else {
 362                 if (IS_FLT_DBL_TYPE(md->returntype.type))
 363                         if (farg < 1)
 364                                 farg = 1;
 365         }
 366
 367         /* fill register and stack usage */
 368
 369         md->argintreguse = iarg;
 370         md->argfltreguse = farg;
 371         md->memuse       = stacksize;
 372 }
 373
 374
 375 /* md_return_alloc *************************************************************
 376
 377    Precolor the Java Stackelement containing the Return Value, if
 378    possible. (R3==a00 for int/adr, R4/R3 == a01/a00 for long, F1==a00
 379    for float/double)
 380
 381    --- in
 382    jd:                      jitdata of the current method
 383    stackslot:               Java Stackslot to contain the Return Value
 384
 385    --- out
 386    if precoloring was possible:
 387    VAR(stackslot->varnum)->flags  = PREALLOC
 388                                      ->regoff = [REG_RESULT|REG_FRESULT]
 389    rd->arg[flt|int]reguse   set to a value according the register usage
 390
 391    NOTE: Do not pass a LOCALVAR in stackslot->varnum.
 392
 393 *******************************************************************************/
 394
 395 void md_return_alloc(jitdata *jd, stackelement_t* stackslot)
 396 {
 397         methodinfo   *m;
 398         codeinfo     *code;
 399         registerdata *rd;
 400         methoddesc   *md;
 401
 402         /* get required compiler data */
 403
 404         m    = jd->m;
 405         code = jd->code;
 406         rd   = jd->rd;
 407
 408         md = m->parseddesc;
 409
 410         /* In Leafmethods Local Vars holding parameters are precolored to
 411            their argument register -> so leafmethods with paramcount > 0
 412            could already use R3 == a00! */
 413
 414         if (!code_is_leafmethod(code) || (md->paramcount == 0)) {
 415                 /* Only precolor the stackslot, if it is not a SAVEDVAR <->
 416                    has not to survive method invokations. */
 417
 418                 if (!(stackslot->flags & SAVEDVAR)) {
 419
 420                         VAR(stackslot->varnum)->flags = PREALLOC;
 421
 422                         if (IS_INT_LNG_TYPE(md->returntype.type)) {
 423                                 if (!IS_2_WORD_TYPE(md->returntype.type)) {
 424                                         if (rd->argintreguse < 1)
 425                                                 rd->argintreguse = 1;
 426
 427                                         VAR(stackslot->varnum)->vv.regoff = REG_RESULT;
 428                                 }
 429                                 else {
 430                                         if (rd->argintreguse < 2)
 431                                                 rd->argintreguse = 2;
 432
 433                                         VAR(stackslot->varnum)->vv.regoff = REG_RESULT_PACKED;
 434                                 }
 435                         }
 436                         else {
 437                                 if (rd->argfltreguse < 1)
 438                                         rd->argfltreguse = 1;
 439
 440                                 VAR(stackslot->varnum)->vv.regoff = REG_FRESULT;
 441                         }
 442                 }
 443         }
 444 }
 445
 446
 447 /*
 448  * These are local overrides for various environment variables in Emacs.
 449  * Please do not remove this and leave it at the end of the file, where
 450  * Emacs will automagically detect them.
 451  * ---------------------------------------------------------------------
 452  * Local variables:
 453  * mode: c
 454  * indent-tabs-mode: t
 455  * c-basic-offset: 4
 456  * tab-width: 4
 457  * End:
 458  * vim:noexpandtab:sw=4:ts=4:
 459  */