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

   1 /* src/vm/jit/powerpc/linux/md-abi.c - functions for PowerPC Linux 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 <assert.h>
  29 #include <stdint.h>
  30
  31 #include "vm/jit/powerpc/linux/md-abi.h"
  32
  33 #include "vm/descriptor.hpp"
  34 #include "vm/global.h"
  35
  36 #include "vm/jit/abi.h"
  37 #include "vm/jit/stack.h"
  38
  39
  40 /* register descripton arrays *************************************************/
  41
  42 int nregdescint[] = {
  43         /* zero,      sp, NO(sys),   a0/v0,   a1/v1,      a2,      a3,      a4,   */
  44         REG_RES, REG_RES, REG_RES, REG_ARG, REG_ARG, REG_ARG, REG_ARG, REG_ARG,
  45
  46         /*   a5,      a6,      a7,   itmp1,   itmp2,      pv,      s0,      s1,   */
  47         REG_ARG, REG_ARG, REG_ARG, REG_RES, REG_RES, REG_RES, REG_SAV, REG_SAV,
  48
  49         /*itmp3,      t0,      t1,      t2,      t3,      t4,      t5,      t6,   */
  50         REG_RES, REG_TMP, REG_TMP, REG_TMP, REG_TMP, REG_TMP, REG_TMP, REG_TMP,
  51
  52         /*   s2,      s3,      s4,      s5,      s6,      s7,      s8,      s9,   */
  53         REG_SAV, REG_SAV, REG_SAV, REG_SAV, REG_SAV, REG_SAV, REG_SAV, REG_SAV,
  54
  55         REG_END
  56 };
  57
  58 const char *abi_registers_integer_name[] = {
  59         "r0",  "r1",  "r2",  "r3",  "r4",  "r5",  "r6",  "r7",
  60         "r8",  "r9",  "r10", "r11", "r12", "r13", "r14", "r15",
  61         "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
  62         "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",
  63 };
  64
  65 const int abi_registers_integer_argument[] = {
  66         3,  /* a0 */
  67         4,  /* a1 */
  68         5,  /* a2 */
  69         6,  /* a3 */
  70         7,  /* a4 */
  71         8,  /* a5 */
  72         9,  /* a6 */
  73         10, /* a7 */
  74 };
  75
  76 const int abi_registers_integer_saved[] = {
  77         14, /* s0 */
  78         15, /* s1 */
  79         24, /* s2 */
  80         25, /* s3 */
  81         26, /* s4 */
  82         27, /* s5 */
  83         28, /* s6 */
  84         29, /* s7 */
  85         30, /* s8 */
  86         31, /* s9 */
  87 };
  88
  89 const int abi_registers_integer_temporary[] = {
  90         17, /* t0 */
  91         18, /* t1 */
  92         19, /* t2 */
  93         20, /* t3 */
  94         21, /* t4 */
  95         22, /* t5 */
  96         23, /* t6 */
  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,     ft0,     ft1,     ft2,     ft3,     ft4,     fs0,     fs1,   */
 105         REG_ARG, REG_TMP, REG_TMP, REG_TMP, REG_TMP, REG_TMP, REG_SAV, REG_SAV,
 106
 107         /*ftmp1,   ftmp2,     ft5,     ft6,     ft7,     ft8,     ft9,    ft10,   */
 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
 117 const int abi_registers_float_argument[] = {
 118         1,  /* fa0  */
 119         2,  /* fa1  */
 120         3,  /* fa2  */
 121         4,  /* fa3  */
 122         5,  /* fa4  */
 123         6,  /* fa5  */
 124         7,  /* fa6  */
 125         8,  /* fa7  */
 126 };
 127
 128 const int abi_registers_float_saved[] = {
 129         14, /* fs0  */
 130         15, /* fs1  */
 131         24, /* fs2  */
 132         25, /* fs3  */
 133         26, /* fs4  */
 134         27, /* fs5  */
 135         28, /* fs6  */
 136         29, /* fs7  */
 137         30, /* fs8  */
 138         31, /* fs9  */
 139 };
 140
 141 const int abi_registers_float_temporary[] = {
 142         9,  /* ft0  */
 143         10, /* ft1  */
 144         11, /* ft2  */
 145         12, /* ft3  */
 146         13, /* ft4  */
 147         18, /* ft5  */
 148         19, /* ft6  */
 149         20, /* ft7  */
 150         21, /* ft8  */
 151         22, /* ft9  */
 152         23, /* ft10 */
 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                                 ALIGN_2(iarg);
 212                                 pd->inmemory = false;
 213                                 pd->index    = PACK_REGS(iarg + 1, iarg);
 214                                 pd->regoff   =
 215                                         PACK_REGS(abi_registers_integer_argument[iarg + 1],
 216                                                           abi_registers_integer_argument[iarg]);
 217                                 iarg += 2;
 218                         }
 219                         else {
 220                                 pd->inmemory = true;
 221                                 pd->index    = stacksize;
 222                                 pd->regoff   = stacksize * 8;
 223                                 iarg         = INT_ARG_CNT;
 224                                 stacksize++;
 225                         }
 226                         break;
 227
 228                 case TYPE_FLT:
 229                 case TYPE_DBL:
 230                         if (farg < FLT_ARG_CNT) {
 231                                 pd->inmemory = false;
 232                                 pd->index    = farg;
 233                                 pd->regoff   = abi_registers_float_argument[farg];
 234                                 farg++;
 235                         }
 236                         else {
 237                                 pd->inmemory = true;
 238                                 pd->index    = stacksize;
 239                                 pd->regoff   = stacksize * 8;
 240                                 stacksize++;
 241                         }
 242                         break;
 243
 244                 default:
 245                         assert(0);
 246                 }
 247         }
 248
 249         /* Since R3/R4, F1 (==A0/A1, A0) are used for passing return
 250            values, this argument register usage has to be regarded,
 251            too. */
 252
 253         if (IS_INT_LNG_TYPE(md->returntype.type)) {
 254                 if (iarg < (IS_2_WORD_TYPE(md->returntype.type) ? 2 : 1))
 255                         iarg = IS_2_WORD_TYPE(md->returntype.type) ? 2 : 1;
 256         }
 257         else {
 258                 if (IS_FLT_DBL_TYPE(md->returntype.type))
 259                         if (farg < 1)
 260                                 farg = 1;
 261         }
 262
 263         /* fill register and stack usage */
 264
 265         md->argintreguse = iarg;
 266         md->argfltreguse = farg;
 267         md->memuse       = stacksize;
 268 }
 269
 270
 271 /* md_param_alloc_native *******************************************************
 272
 273    Pre-allocate arguments according the native ABI.
 274
 275 *******************************************************************************/
 276
 277 void md_param_alloc_native(methoddesc *md)
 278 {
 279         paramdesc *pd;
 280         int        i;
 281         int        iarg;
 282         int        farg;
 283         int        stacksize;
 284
 285         /* set default values */
 286
 287         iarg = 0;
 288         farg = 0;
 289         stacksize = LA_SIZE_IN_POINTERS;
 290
 291         /* get params field of methoddesc */
 292
 293         pd = md->params;
 294
 295         for (i = 0; i < md->paramcount; i++, pd++) {
 296                 switch (md->paramtypes[i].type) {
 297                 case TYPE_INT:
 298                 case TYPE_ADR:
 299                         if (iarg < INT_ARG_CNT) {
 300                                 pd->inmemory  = false;
 301                                 pd->regoff    = abi_registers_integer_argument[iarg];
 302                                 iarg++;
 303                         }
 304                         else {
 305                                 pd->inmemory  = true;
 306                                 pd->regoff    = stacksize * 4;
 307                                 stacksize++;
 308                         }
 309                         break;
 310
 311                 case TYPE_LNG:
 312                         if (iarg < INT_ARG_CNT - 1) {
 313                                 ALIGN_2(iarg);
 314                                 pd->inmemory  = false;
 315                                 pd->regoff    =
 316                                         PACK_REGS(abi_registers_integer_argument[iarg + 1],
 317                                                           abi_registers_integer_argument[iarg]);
 318                                 iarg += 2;
 319                         }
 320                         else {
 321                                 ALIGN_2(stacksize);
 322                                 pd->inmemory  = true;
 323                                 pd->regoff    = stacksize * 4;
 324                                 iarg          = INT_ARG_CNT;
 325                                 stacksize    += 2;
 326                         }
 327                         break;
 328
 329                 case TYPE_FLT:
 330                         if (farg < FLT_ARG_CNT) {
 331                                 pd->inmemory  = false;
 332                                 pd->regoff    = abi_registers_float_argument[farg];
 333                                 farg++;
 334                         }
 335                         else {
 336                                 pd->inmemory  = true;
 337                                 pd->regoff    = stacksize * 4;
 338                                 stacksize++;
 339                         }
 340                         break;
 341
 342                 case TYPE_DBL:
 343                         if (farg < FLT_ARG_CNT) {
 344                                 pd->inmemory  = false;
 345                                 pd->regoff    = abi_registers_float_argument[farg];
 346                                 farg++;
 347                         }
 348                         else {
 349                                 ALIGN_2(stacksize);
 350                                 pd->inmemory  = true;
 351                                 pd->regoff    = stacksize * 4;
 352                                 stacksize    += 2;
 353                         }
 354                         break;
 355
 356                 default:
 357                         assert(0);
 358                 }
 359         }
 360
 361         /* Since R3/R4, F1 (==A0/A1, A0) are used for passing return
 362            values, this argument register usage has to be regarded,
 363            too. */
 364
 365         if (IS_INT_LNG_TYPE(md->returntype.type)) {
 366                 if (iarg < (IS_2_WORD_TYPE(md->returntype.type) ? 2 : 1))
 367                         iarg = IS_2_WORD_TYPE(md->returntype.type) ? 2 : 1;
 368         }
 369         else {
 370                 if (IS_FLT_DBL_TYPE(md->returntype.type))
 371                         if (farg < 1)
 372                                 farg = 1;
 373         }
 374
 375         /* fill register and stack usage */
 376
 377         md->argintreguse = iarg;
 378         md->argfltreguse = farg;
 379         md->memuse       = stacksize;
 380 }
 381
 382
 383 /* md_return_alloc *************************************************************
 384
 385    Precolor the Java Stackelement containing the Return Value, if
 386    possible.  (R3==a00 for int/adr, R4/R3 == a01/a00 for long, F1==a00
 387    for float/double)
 388
 389    --- in
 390    jd:                      jitdata of the current method
 391    stackslot:               Java Stackslot to contain the Return Value
 392
 393    --- out
 394    if precoloring was possible:
 395    VAR(stackslot->varnum)->flags       = PREALLOC
 396                                      ->regoff      = [REG_RESULT|REG_FRESULT]
 397    rd->arg[flt|int]reguse   set to a value according the register usage
 398
 399    NOTE: Do not pass a LOCALVAR in stackslot->varnum.
 400
 401 *******************************************************************************/
 402
 403 void md_return_alloc(jitdata *jd, stackelement_t *stackslot)
 404 {
 405         methodinfo   *m;
 406         codeinfo     *code;
 407         registerdata *rd;
 408         methoddesc   *md;
 409         varinfo      *v;
 410
 411         /* get required compiler data */
 412
 413         m    = jd->m;
 414         code = jd->code;
 415         rd   = jd->rd;
 416
 417         md = m->parseddesc;
 418
 419         /* In Leafmethods Local Vars holding parameters are precolored to
 420            their argument register -> so leafmethods with paramcount > 0
 421            could already use R3 == a00! */
 422
 423         if (!code_is_leafmethod(code) || (md->paramcount == 0)) {
 424                 /* Only precolor the stackslot, if it is not a SAVEDVAR <->
 425                    has not to survive method invokations. */
 426
 427                 if (!(stackslot->flags & SAVEDVAR)) {
 428                         v = VAR(stackslot->varnum);
 429                         v->flags = PREALLOC;
 430
 431                         switch (md->returntype.type) {
 432                         case TYPE_INT:
 433                         case TYPE_ADR:
 434                                 if (rd->argintreguse < 1)
 435                                         rd->argintreguse = 1;
 436
 437                                 v->vv.regoff = REG_RESULT;
 438                                 break;
 439
 440                         case TYPE_LNG:
 441                                 if (rd->argintreguse < 2)
 442                                         rd->argintreguse = 2;
 443
 444                                 v->vv.regoff = REG_RESULT_PACKED;
 445                                 break;
 446
 447                         case TYPE_FLT:
 448                         case TYPE_DBL:
 449                                 if (rd->argfltreguse < 1)
 450                                         rd->argfltreguse = 1;
 451
 452                                 v->vv.regoff = REG_FRESULT;
 453                                 break;
 454                         }
 455                 }
 456         }
 457 }
 458
 459
 460 /*
 461  * These are local overrides for various environment variables in Emacs.
 462  * Please do not remove this and leave it at the end of the file, where
 463  * Emacs will automagically detect them.
 464  * ---------------------------------------------------------------------
 465  * Local variables:
 466  * mode: c
 467  * indent-tabs-mode: t
 468  * c-basic-offset: 4
 469  * tab-width: 4
 470  * End:
 471  * vim:noexpandtab:sw=4:ts=4:
 472  */