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/global.h"
  34
  35 #include "vm/jit/abi.h"
  36 #include "vm/jit/stack.h"
  37
  38 #include "vmcore/descriptor.h"
  39
  40
  41 /* register descripton arrays *************************************************/
  42
  43 int nregdescint[] = {
  44         /* zero,      sp, NO(sys),   a0/v0,   a1/v1,      a2,      a3,      a4,   */
  45         REG_RES, REG_RES, REG_RES, REG_ARG, REG_ARG, REG_ARG, REG_ARG, REG_ARG,
  46
  47         /*   a5,      a6,      a7,   itmp1,   itmp2,      pv,      s0,      s1,   */
  48         REG_ARG, REG_ARG, REG_ARG, REG_RES, REG_RES, REG_RES, REG_SAV, REG_SAV,
  49
  50         /*itmp3,      t0,      t1,      t2,      t3,      t4,      t5,      t6,   */
  51         REG_RES, REG_TMP, REG_TMP, REG_TMP, REG_TMP, REG_TMP, REG_TMP, REG_TMP,
  52
  53         /*   s2,      s3,      s4,      s5,      s6,      s7,      s8,      s9,   */
  54         REG_SAV, REG_SAV, REG_SAV, REG_SAV, REG_SAV, REG_SAV, REG_SAV, REG_SAV,
  55
  56         REG_END
  57 };
  58
  59 const char *abi_registers_integer_name[] = {
  60         "r0",  "r1",  "r2",  "r3",  "r4",  "r5",  "r6",  "r7",
  61         "r8",  "r9",  "r10", "r11", "r12", "r13", "r14", "r15",
  62         "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
  63         "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",
  64 };
  65
  66 const int abi_registers_integer_argument[] = {
  67         3,  /* a0 */
  68         4,  /* a1 */
  69         5,  /* a2 */
  70         6,  /* a3 */
  71         7,  /* a4 */
  72         8,  /* a5 */
  73         9,  /* a6 */
  74         10, /* a7 */
  75 };
  76
  77 const int abi_registers_integer_saved[] = {
  78         14, /* s0 */
  79         15, /* s1 */
  80         24, /* s2 */
  81         25, /* s3 */
  82         26, /* s4 */
  83         27, /* s5 */
  84         28, /* s6 */
  85         29, /* s7 */
  86         30, /* s8 */
  87         31, /* s9 */
  88 };
  89
  90 const int abi_registers_integer_temporary[] = {
  91         17, /* t0 */
  92         18, /* t1 */
  93         19, /* t2 */
  94         20, /* t3 */
  95         21, /* t4 */
  96         22, /* t5 */
  97         23, /* t6 */
  98 };
  99
 100
 101 int nregdescfloat[] = {
 102         /*ftmp3,  fa0/v0,     fa1,     fa2,     fa3,     fa4,     fa5,     fa6,   */
 103         REG_RES, REG_ARG, REG_ARG, REG_ARG, REG_ARG, REG_ARG, REG_ARG, REG_ARG,
 104
 105         /*  fa7,     ft0,     ft1,     ft2,     ft3,     ft4,     fs0,     fs1,   */
 106         REG_ARG, REG_TMP, REG_TMP, REG_TMP, REG_TMP, REG_TMP, REG_SAV, REG_SAV,
 107
 108         /*ftmp1,   ftmp2,     ft5,     ft6,     ft7,     ft8,     ft9,    ft10,   */
 109         REG_RES, REG_RES, REG_TMP, REG_TMP, REG_TMP, REG_TMP, REG_TMP, REG_TMP,
 110
 111         /*  fs2,     fs3,     fs4,     fs5,     fs6,     fs7,     fs8,     fs9    */
 112         REG_SAV, REG_SAV, REG_SAV, REG_SAV, REG_SAV, REG_SAV, REG_SAV, REG_SAV,
 113
 114         REG_END
 115 };
 116
 117
 118 const int abi_registers_float_argument[] = {
 119         1,  /* fa0  */
 120         2,  /* fa1  */
 121         3,  /* fa2  */
 122         4,  /* fa3  */
 123         5,  /* fa4  */
 124         6,  /* fa5  */
 125         7,  /* fa6  */
 126         8,  /* fa7  */
 127 };
 128
 129 const int abi_registers_float_saved[] = {
 130         14, /* fs0  */
 131         15, /* fs1  */
 132         24, /* fs2  */
 133         25, /* fs3  */
 134         26, /* fs4  */
 135         27, /* fs5  */
 136         28, /* fs6  */
 137         29, /* fs7  */
 138         30, /* fs8  */
 139         31, /* fs9  */
 140 };
 141
 142 const int abi_registers_float_temporary[] = {
 143         9,  /* ft0  */
 144         10, /* ft1  */
 145         11, /* ft2  */
 146         12, /* ft3  */
 147         13, /* ft4  */
 148         18, /* ft5  */
 149         19, /* ft6  */
 150         20, /* ft7  */
 151         21, /* ft8  */
 152         22, /* ft9  */
 153         23, /* ft10 */
 154 };
 155
 156
 157 /* md_param_alloc **************************************************************
 158
 159    Allocate Arguments to Stackslots according the Calling Conventions
 160
 161    --- in
 162    md->paramcount:           Number of arguments for this method
 163    md->paramtypes[].type:    Argument types
 164
 165    --- out
 166    md->params[].inmemory:    Argument spilled on stack
 167    md->params[].regoff:      Stack offset or rd->arg[int|flt]regs index
 168    md->memuse:               Stackslots needed for argument spilling
 169    md->argintreguse:         max number of integer arguments used
 170    md->argfltreguse:         max number of float arguments used
 171
 172 *******************************************************************************/
 173
 174 void md_param_alloc(methoddesc *md)
 175 {
 176         paramdesc *pd;
 177         int        i;
 178         int        iarg;
 179         int        farg;
 180         int        stacksize;
 181
 182         /* set default values */
 183
 184         iarg = 0;
 185         farg = 0;
 186         stacksize = LA_SIZE_IN_POINTERS;
 187
 188         /* get params field of methoddesc */
 189
 190         pd = md->params;
 191
 192         for (i = 0; i < md->paramcount; i++, pd++) {
 193                 switch (md->paramtypes[i].type) {
 194                 case TYPE_INT:
 195                 case TYPE_ADR:
 196                         if (iarg < INT_ARG_CNT) {
 197                                 pd->inmemory = false;
 198                                 pd->index    = iarg;
 199                                 pd->regoff   = abi_registers_integer_argument[iarg];
 200                                 iarg++;
 201                         }
 202                         else {
 203                                 pd->inmemory = true;
 204                                 pd->index    = stacksize;
 205                                 pd->regoff   = stacksize * 8;
 206                                 stacksize++;
 207                         }
 208                         break;
 209
 210                 case TYPE_LNG:
 211                         if (iarg < INT_ARG_CNT - 1) {
 212                                 ALIGN_2(iarg);
 213                                 pd->inmemory = false;
 214                                 pd->index    = PACK_REGS(iarg + 1, iarg);
 215                                 pd->regoff   =
 216                                         PACK_REGS(abi_registers_integer_argument[iarg + 1],
 217                                                           abi_registers_integer_argument[iarg]);
 218                                 iarg += 2;
 219                         }
 220                         else {
 221                                 pd->inmemory = true;
 222                                 pd->index    = stacksize;
 223                                 pd->regoff   = stacksize * 8;
 224                                 iarg         = INT_ARG_CNT;
 225                                 stacksize++;
 226                         }
 227                         break;
 228
 229                 case TYPE_FLT:
 230                 case TYPE_DBL:
 231                         if (farg < FLT_ARG_CNT) {
 232                                 pd->inmemory = false;
 233                                 pd->index    = farg;
 234                                 pd->regoff   = abi_registers_float_argument[farg];
 235                                 farg++;
 236                         }
 237                         else {
 238                                 pd->inmemory = true;
 239                                 pd->index    = stacksize;
 240                                 pd->regoff   = stacksize * 8;
 241                                 stacksize++;
 242                         }
 243                         break;
 244
 245                 default:
 246                         assert(0);
 247                 }
 248         }
 249
 250         /* Since R3/R4, F1 (==A0/A1, A0) are used for passing return
 251            values, this argument register usage has to be regarded,
 252            too. */
 253
 254         if (IS_INT_LNG_TYPE(md->returntype.type)) {
 255                 if (iarg < (IS_2_WORD_TYPE(md->returntype.type) ? 2 : 1))
 256                         iarg = IS_2_WORD_TYPE(md->returntype.type) ? 2 : 1;
 257         }
 258         else {
 259                 if (IS_FLT_DBL_TYPE(md->returntype.type))
 260                         if (farg < 1)
 261                                 farg = 1;
 262         }
 263
 264         /* fill register and stack usage */
 265
 266         md->argintreguse = iarg;
 267         md->argfltreguse = farg;
 268         md->memuse       = stacksize;
 269 }
 270
 271
 272 /* md_param_alloc_native *******************************************************
 273
 274    Pre-allocate arguments according the native ABI.
 275
 276 *******************************************************************************/
 277
 278 void md_param_alloc_native(methoddesc *md)
 279 {
 280         paramdesc *pd;
 281         int        i;
 282         int        iarg;
 283         int        farg;
 284         int        stacksize;
 285
 286         /* set default values */
 287
 288         iarg = 0;
 289         farg = 0;
 290         stacksize = LA_SIZE_IN_POINTERS;
 291
 292         /* get params field of methoddesc */
 293
 294         pd = md->params;
 295
 296         for (i = 0; i < md->paramcount; i++, pd++) {
 297                 switch (md->paramtypes[i].type) {
 298                 case TYPE_INT:
 299                 case TYPE_ADR:
 300                         if (iarg < INT_ARG_CNT) {
 301                                 pd->inmemory  = false;
 302                                 pd->regoff    = abi_registers_integer_argument[iarg];
 303                                 iarg++;
 304                         }
 305                         else {
 306                                 pd->inmemory  = true;
 307                                 pd->regoff    = stacksize * 4;
 308                                 stacksize++;
 309                         }
 310                         break;
 311
 312                 case TYPE_LNG:
 313                         if (iarg < INT_ARG_CNT - 1) {
 314                                 ALIGN_2(iarg);
 315                                 pd->inmemory  = false;
 316                                 pd->regoff    =
 317                                         PACK_REGS(abi_registers_integer_argument[iarg + 1],
 318                                                           abi_registers_integer_argument[iarg]);
 319                                 iarg += 2;
 320                         }
 321                         else {
 322                                 ALIGN_2(stacksize);
 323                                 pd->inmemory  = true;
 324                                 pd->regoff    = stacksize * 4;
 325                                 iarg          = INT_ARG_CNT;
 326                                 stacksize    += 2;
 327                         }
 328                         break;
 329
 330                 case TYPE_FLT:
 331                         if (farg < FLT_ARG_CNT) {
 332                                 pd->inmemory  = false;
 333                                 pd->regoff    = abi_registers_float_argument[farg];
 334                                 farg++;
 335                         }
 336                         else {
 337                                 pd->inmemory  = true;
 338                                 pd->regoff    = stacksize * 4;
 339                                 stacksize++;
 340                         }
 341                         break;
 342
 343                 case TYPE_DBL:
 344                         if (farg < FLT_ARG_CNT) {
 345                                 pd->inmemory  = false;
 346                                 pd->regoff    = abi_registers_float_argument[farg];
 347                                 farg++;
 348                         }
 349                         else {
 350                                 ALIGN_2(stacksize);
 351                                 pd->inmemory  = true;
 352                                 pd->regoff    = stacksize * 4;
 353                                 stacksize    += 2;
 354                         }
 355                         break;
 356
 357                 default:
 358                         assert(0);
 359                 }
 360         }
 361
 362         /* Since R3/R4, F1 (==A0/A1, A0) are used for passing return
 363            values, this argument register usage has to be regarded,
 364            too. */
 365
 366         if (IS_INT_LNG_TYPE(md->returntype.type)) {
 367                 if (iarg < (IS_2_WORD_TYPE(md->returntype.type) ? 2 : 1))
 368                         iarg = IS_2_WORD_TYPE(md->returntype.type) ? 2 : 1;
 369         }
 370         else {
 371                 if (IS_FLT_DBL_TYPE(md->returntype.type))
 372                         if (farg < 1)
 373                                 farg = 1;
 374         }
 375
 376         /* fill register and stack usage */
 377
 378         md->argintreguse = iarg;
 379         md->argfltreguse = farg;
 380         md->memuse       = stacksize;
 381 }
 382
 383
 384 /* md_return_alloc *************************************************************
 385
 386    Precolor the Java Stackelement containing the Return Value, if
 387    possible.  (R3==a00 for int/adr, R4/R3 == a01/a00 for long, F1==a00
 388    for float/double)
 389
 390    --- in
 391    jd:                      jitdata of the current method
 392    stackslot:               Java Stackslot to contain the Return Value
 393
 394    --- out
 395    if precoloring was possible:
 396    VAR(stackslot->varnum)->flags       = PREALLOC
 397                                      ->regoff      = [REG_RESULT|REG_FRESULT]
 398    rd->arg[flt|int]reguse   set to a value according the register usage
 399
 400    NOTE: Do not pass a LOCALVAR in stackslot->varnum.
 401
 402 *******************************************************************************/
 403
 404 void md_return_alloc(jitdata *jd, stackelement_t *stackslot)
 405 {
 406         methodinfo   *m;
 407         codeinfo     *code;
 408         registerdata *rd;
 409         methoddesc   *md;
 410         varinfo      *v;
 411
 412         /* get required compiler data */
 413
 414         m    = jd->m;
 415         code = jd->code;
 416         rd   = jd->rd;
 417
 418         md = m->parseddesc;
 419
 420         /* In Leafmethods Local Vars holding parameters are precolored to
 421            their argument register -> so leafmethods with paramcount > 0
 422            could already use R3 == a00! */
 423
 424         if (!code_is_leafmethod(code) || (md->paramcount == 0)) {
 425                 /* Only precolor the stackslot, if it is not a SAVEDVAR <->
 426                    has not to survive method invokations. */
 427
 428                 if (!(stackslot->flags & SAVEDVAR)) {
 429                         v = VAR(stackslot->varnum);
 430                         v->flags = PREALLOC;
 431
 432                         switch (md->returntype.type) {
 433                         case TYPE_INT:
 434                         case TYPE_ADR:
 435                                 if (rd->argintreguse < 1)
 436                                         rd->argintreguse = 1;
 437
 438                                 v->vv.regoff = REG_RESULT;
 439                                 break;
 440
 441                         case TYPE_LNG:
 442                                 if (rd->argintreguse < 2)
 443                                         rd->argintreguse = 2;
 444
 445                                 v->vv.regoff = REG_RESULT_PACKED;
 446                                 break;
 447
 448                         case TYPE_FLT:
 449                         case TYPE_DBL:
 450                                 if (rd->argfltreguse < 1)
 451                                         rd->argfltreguse = 1;
 452
 453                                 v->vv.regoff = REG_FRESULT;
 454                                 break;
 455                         }
 456                 }
 457         }
 458 }
 459
 460
 461 /*
 462  * These are local overrides for various environment variables in Emacs.
 463  * Please do not remove this and leave it at the end of the file, where
 464  * Emacs will automagically detect them.
 465  * ---------------------------------------------------------------------
 466  * Local variables:
 467  * mode: c
 468  * indent-tabs-mode: t
 469  * c-basic-offset: 4
 470  * tab-width: 4
 471  * End:
 472  */