src/vm/jit/powerpc/emit.c

   1 /* src/vm/jit/powerpc/emit.c - PowerPC code emitter functions
   2
   3    Copyright (C) 1996-2005, 2006 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    Contact: cacao@cacaojvm.org
  26
  27    Authors: Christian Thalinger
  28
  29    Changes:
  30
  31    $Id: emitfuncs.c 4398 2006-01-31 23:43:08Z twisti $
  32
  33 */
  34
  35
  36 #include "config.h"
  37
  38 #include <assert.h>
  39
  40 #include "vm/types.h"
  41
  42 #include "md-abi.h"
  43
  44 #include "vm/jit/powerpc/codegen.h"
  45
  46 #include "vm/builtin.h"
  47 #include "vm/jit/asmpart.h"
  48 #include "vm/jit/dseg.h"
  49 #include "vm/jit/emit.h"
  50 #include "vm/jit/jit.h"
  51 #include "vm/jit/replace.h"
  52
  53
  54 /* emit_load *******************************************************************
  55
  56    Emits a possible load of an operand.
  57
  58 *******************************************************************************/
  59
  60 s4 emit_load(jitdata *jd, instruction *iptr, stackptr src, s4 tempreg)
  61 {
  62         codegendata *cd;
  63         s4           disp;
  64         s4           reg;
  65
  66         /* get required compiler data */
  67
  68         cd = jd->cd;
  69
  70         if (src->flags & INMEMORY) {
  71                 COUNT_SPILLS;
  72
  73                 disp = src->regoff * 4;
  74
  75                 if (IS_FLT_DBL_TYPE(src->type)) {
  76                         if (IS_2_WORD_TYPE(src->type))
  77                                 M_DLD(tempreg, REG_SP, disp);
  78                         else
  79                                 M_FLD(tempreg, REG_SP, disp);
  80                 }
  81                 else {
  82                         if (IS_2_WORD_TYPE(src->type))
  83                                 M_LLD(tempreg, REG_SP, disp);
  84                         else
  85                                 M_ILD(tempreg, REG_SP, disp);
  86                 }
  87
  88                 reg = tempreg;
  89         }
  90         else
  91                 reg = src->regoff;
  92
  93         return reg;
  94 }
  95
  96
  97 /* emit_load_low ***************************************************************
  98
  99    Emits a possible load of the low 32-bits of an operand.
 100
 101 *******************************************************************************/
 102
 103 s4 emit_load_low(jitdata *jd, instruction *iptr, stackptr src, s4 tempreg)
 104 {
 105         codegendata  *cd;
 106         s4            disp;
 107         s4            reg;
 108
 109         assert(src->type == TYPE_LNG);
 110
 111         /* get required compiler data */
 112
 113         cd = jd->cd;
 114
 115         if (src->flags & INMEMORY) {
 116                 COUNT_SPILLS;
 117
 118                 disp = src->regoff * 4;
 119
 120                 M_ILD(tempreg, REG_SP, disp + 4);
 121
 122                 reg = tempreg;
 123         }
 124         else
 125                 reg = GET_LOW_REG(src->regoff);
 126
 127         return reg;
 128 }
 129
 130
 131 /* emit_load_high **************************************************************
 132
 133    Emits a possible load of the high 32-bits of an operand.
 134
 135 *******************************************************************************/
 136
 137 s4 emit_load_high(jitdata *jd, instruction *iptr, stackptr src, s4 tempreg)
 138 {
 139         codegendata  *cd;
 140         s4            disp;
 141         s4            reg;
 142
 143         assert(src->type == TYPE_LNG);
 144
 145         /* get required compiler data */
 146
 147         cd = jd->cd;
 148
 149         if (src->flags & INMEMORY) {
 150                 COUNT_SPILLS;
 151
 152                 disp = src->regoff * 4;
 153
 154                 M_ILD(tempreg, REG_SP, disp);
 155
 156                 reg = tempreg;
 157         }
 158         else
 159                 reg = GET_LOW_REG(src->regoff);
 160
 161         return reg;
 162 }
 163
 164
 165 /* emit_load_s1 ****************************************************************
 166
 167    Emits a possible load of the first source operand.
 168
 169 *******************************************************************************/
 170
 171 s4 emit_load_s1(jitdata *jd, instruction *iptr, s4 tempreg)
 172 {
 173         stackptr src;
 174         s4       reg;
 175
 176         src = iptr->s1.var;
 177
 178         reg = emit_load(jd, iptr, src, tempreg);
 179
 180         return reg;
 181 }
 182
 183
 184 /* emit_load_s2 ****************************************************************
 185
 186    Emits a possible load of the second source operand.
 187
 188 *******************************************************************************/
 189
 190 s4 emit_load_s2(jitdata *jd, instruction *iptr, s4 tempreg)
 191 {
 192         stackptr src;
 193         s4       reg;
 194
 195         src = iptr->sx.s23.s2.var;
 196
 197         reg = emit_load(jd, iptr, src, tempreg);
 198
 199         return reg;
 200 }
 201
 202
 203 /* emit_load_s3 ****************************************************************
 204
 205    Emits a possible load of the third source operand.
 206
 207 *******************************************************************************/
 208
 209 s4 emit_load_s3(jitdata *jd, instruction *iptr, s4 tempreg)
 210 {
 211         stackptr src;
 212         s4       reg;
 213
 214         src = iptr->sx.s23.s2.var;
 215
 216         reg = emit_load(jd, iptr, src, tempreg);
 217
 218         return reg;
 219 }
 220
 221
 222 /* emit_load_s1_low ************************************************************
 223
 224    Emits a possible load of the low 32-bits of the first long source
 225    operand.
 226
 227 *******************************************************************************/
 228
 229 s4 emit_load_s1_low(jitdata *jd, instruction *iptr, s4 tempreg)
 230 {
 231         stackptr src;
 232         s4       reg;
 233
 234         assert(src->type == TYPE_LNG);
 235
 236         src = iptr->s1.var;
 237
 238         reg = emit_load_low(jd, iptr, src, tempreg);
 239
 240         return reg;
 241 }
 242
 243
 244 /* emit_load_s2_low ************************************************************
 245
 246    Emits a possible load of the low 32-bits of the second long source
 247    operand.
 248
 249 *******************************************************************************/
 250
 251 s4 emit_load_s2_low(jitdata *jd, instruction *iptr, s4 tempreg)
 252 {
 253         stackptr src;
 254         s4       reg;
 255
 256         assert(src->type == TYPE_LNG);
 257
 258         src = iptr->sx.s23.s2.var;
 259
 260         reg = emit_load_low(jd, iptr, src, tempreg);
 261
 262         return reg;
 263 }
 264
 265
 266 /* emit_load_s3_low ************************************************************
 267
 268    Emits a possible load of the low 32-bits of the third long source
 269    operand.
 270
 271 *******************************************************************************/
 272
 273 s4 emit_load_s3_low(jitdata *jd, instruction *iptr, s4 tempreg)
 274 {
 275         stackptr src;
 276         s4       reg;
 277
 278         assert(src->type == TYPE_LNG);
 279
 280         src = iptr->sx.s23.s3.var;
 281
 282         reg = emit_load_low(jd, iptr, src, tempreg);
 283
 284         return reg;
 285 }
 286
 287
 288 /* emit_load_s1_high ***********************************************************
 289
 290    Emits a possible load of the high 32-bits of the first long source
 291    operand.
 292
 293 *******************************************************************************/
 294
 295 s4 emit_load_s1_high(jitdata *jd, instruction *iptr, s4 tempreg)
 296 {
 297         stackptr src;
 298         s4       reg;
 299
 300         assert(src->type == TYPE_LNG);
 301
 302         src = iptr->s1.var;
 303
 304         reg = emit_load_high(jd, iptr, src, tempreg);
 305
 306         return reg;
 307 }
 308
 309
 310 /* emit_load_s2_high ***********************************************************
 311
 312    Emits a possible load of the high 32-bits of the second long source
 313    operand.
 314
 315 *******************************************************************************/
 316
 317 s4 emit_load_s2_high(jitdata *jd, instruction *iptr, s4 tempreg)
 318 {
 319         stackptr src;
 320         s4       reg;
 321
 322         assert(src->type == TYPE_LNG);
 323
 324         src = iptr->sx.s23.s2.var;
 325
 326         reg = emit_load_high(jd, iptr, src, tempreg);
 327
 328         return reg;
 329 }
 330
 331
 332 /* emit_load_s3_high ***********************************************************
 333
 334    Emits a possible load of the high 32-bits of the third long source
 335    operand.
 336
 337 *******************************************************************************/
 338
 339 s4 emit_load_s3_high(jitdata *jd, instruction *iptr, s4 tempreg)
 340 {
 341         stackptr src;
 342         s4       reg;
 343
 344         assert(src->type == TYPE_LNG);
 345
 346         src = iptr->sx.s23.s3.var;
 347
 348         reg = emit_load_high(jd, iptr, src, tempreg);
 349
 350         return reg;
 351 }
 352
 353
 354 /* emit_store ******************************************************************
 355
 356    XXX
 357
 358 *******************************************************************************/
 359
 360 void emit_store(jitdata *jd, instruction *iptr, stackptr dst, s4 d)
 361 {
 362         codegendata  *cd;
 363
 364         /* get required compiler data */
 365
 366         cd = jd->cd;
 367
 368         if (dst->flags & INMEMORY) {
 369                 COUNT_SPILLS;
 370
 371                 if (IS_FLT_DBL_TYPE(dst->type)) {
 372                         if (IS_2_WORD_TYPE(dst->type))
 373                                 M_DST(d, REG_SP, dst->regoff * 4);
 374                         else
 375                                 M_FST(d, REG_SP, dst->regoff * 4);
 376
 377                 } else {
 378                         if (IS_2_WORD_TYPE(dst->type))
 379                                 M_LST(d, REG_SP, dst->regoff * 4);
 380                         else
 381                                 M_IST(d, REG_SP, dst->regoff * 4);
 382                 }
 383         }
 384 }
 385
 386
 387 /* emit_copy *******************************************************************
 388
 389    XXX
 390
 391 *******************************************************************************/
 392
 393 void emit_copy(jitdata *jd, instruction *iptr, stackptr src, stackptr dst)
 394 {
 395         codegendata  *cd;
 396         registerdata *rd;
 397         s4            s1, d;
 398
 399         /* get required compiler data */
 400
 401         cd = jd->cd;
 402         rd = jd->rd;
 403
 404         if (src->type == TYPE_LNG)
 405                 d = codegen_reg_of_var(rd, iptr->opc, dst, REG_ITMP12_PACKED);
 406         else
 407                 d = codegen_reg_of_var(rd, iptr->opc, dst, REG_IFTMP);
 408
 409         if ((src->regoff != dst->regoff) ||
 410                 ((src->flags ^ dst->flags) & INMEMORY)) {
 411                 s1 = emit_load(jd, iptr, src, d);
 412
 413                 if (s1 != d) {
 414                         if (IS_FLT_DBL_TYPE(src->type))
 415                                 M_FMOV(s1, d);
 416                         else {
 417                                 if (IS_2_WORD_TYPE(src->type)) {
 418                                         M_MOV(GET_LOW_REG(s1), GET_LOW_REG(d));
 419                                         M_MOV(GET_HIGH_REG(s1), GET_HIGH_REG(d));
 420                 }
 421                                 else
 422                     M_MOV(s1, d);
 423                         }
 424                 }
 425
 426                 emit_store(jd, iptr, dst, d);
 427         }
 428 }
 429
 430
 431 /* emit_iconst *****************************************************************
 432
 433    XXX
 434
 435 *******************************************************************************/
 436
 437 void emit_iconst(codegendata *cd, s4 d, s4 value)
 438 {
 439         s4 disp;
 440
 441         if ((value >= -32768) && (value <= 32767))
 442                 M_LDA_INTERN(d, REG_ZERO, value);
 443         else {
 444                 disp = dseg_add_s4(cd, value);
 445                 M_ILD(d, REG_PV, disp);
 446         }
 447 }
 448
 449
 450 /* emit_exception_stubs ********************************************************
 451
 452    Generates the code for the exception stubs.
 453
 454 *******************************************************************************/
 455
 456 void emit_exception_stubs(jitdata *jd)
 457 {
 458         codegendata  *cd;
 459         registerdata *rd;
 460         exceptionref *eref;
 461         s4            targetdisp;
 462         s4            disp;
 463
 464         /* get required compiler data */
 465
 466         cd = jd->cd;
 467         rd = jd->rd;
 468
 469         /* generate exception stubs */
 470
 471         targetdisp = 0;
 472
 473         for (eref = cd->exceptionrefs; eref != NULL; eref = eref->next) {
 474                 gen_resolvebranch(cd->mcodebase + eref->branchpos,
 475                                                   eref->branchpos, cd->mcodeptr - cd->mcodebase);
 476
 477                 MCODECHECK(100);
 478
 479                 /* Move the value register to a temporary register, if
 480                    there is the need for it. */
 481
 482                 if (eref->reg != -1)
 483                         M_MOV(eref->reg, REG_ITMP1);
 484
 485                 /* calcuate exception address */
 486
 487                 M_LDA(REG_ITMP2_XPC, REG_PV, eref->branchpos - 4);
 488
 489                 /* move function to call into REG_ITMP3 */
 490
 491                 disp = dseg_add_functionptr(cd, eref->function);
 492                 M_ALD(REG_ITMP3, REG_PV, disp);
 493
 494                 if (targetdisp == 0) {
 495                     targetdisp = ((u4 *) cd->mcodeptr) - ((u4 *) cd->mcodebase);
 496
 497                         if (jd->isleafmethod) {
 498                                 M_MFLR(REG_ZERO);
 499                                 M_AST(REG_ZERO, REG_SP, cd->stackframesize * 4 + LA_LR_OFFSET);
 500                         }
 501
 502                         M_MOV(REG_PV, rd->argintregs[0]);
 503                         M_MOV(REG_SP, rd->argintregs[1]);
 504
 505                         if (jd->isleafmethod)
 506                                 M_MOV(REG_ZERO, rd->argintregs[2]);
 507                         else
 508                                 M_ALD(rd->argintregs[2],
 509                                           REG_SP, cd->stackframesize * 4 + LA_LR_OFFSET);
 510
 511                         M_MOV(REG_ITMP2_XPC, rd->argintregs[3]);
 512                         M_MOV(REG_ITMP1, rd->argintregs[4]);
 513
 514                         M_STWU(REG_SP, REG_SP, -(LA_SIZE + 6 * 4));
 515                         M_AST(REG_ITMP2_XPC, REG_SP, LA_SIZE + 5 * 4);
 516
 517                         M_MTCTR(REG_ITMP3);
 518                         M_JSR;
 519                         M_MOV(REG_RESULT, REG_ITMP1_XPTR);
 520
 521                         M_ALD(REG_ITMP2_XPC, REG_SP, LA_SIZE + 5 * 4);
 522                         M_IADD_IMM(REG_SP, LA_SIZE + 6 * 4, REG_SP);
 523
 524                         if (jd->isleafmethod) {
 525                                 /* XXX FIXME: REG_ZERO can cause problems here! */
 526                                 assert(cd->stackframesize * 4 <= 32767);
 527
 528                                 M_ALD(REG_ZERO, REG_SP, cd->stackframesize * 4 + LA_LR_OFFSET);
 529                                 M_MTLR(REG_ZERO);
 530                         }
 531
 532                         disp = dseg_add_functionptr(cd, asm_handle_exception);
 533                         M_ALD(REG_ITMP3, REG_PV, disp);
 534                         M_MTCTR(REG_ITMP3);
 535                         M_RTS;
 536                 }
 537                 else {
 538                         disp = (((u4 *) cd->mcodebase) + targetdisp) -
 539                                 (((u4 *) cd->mcodeptr) + 1);
 540                         M_BR(disp);
 541                 }
 542         }
 543 }
 544
 545
 546 /* emit_patcher_stubs **********************************************************
 547
 548    Generates the code for the patcher stubs.
 549
 550 *******************************************************************************/
 551
 552 void emit_patcher_stubs(jitdata *jd)
 553 {
 554         codegendata *cd;
 555         patchref    *pref;
 556         u4           mcode;
 557         u1          *savedmcodeptr;
 558         u1          *tmpmcodeptr;
 559         s4           targetdisp;
 560         s4           disp;
 561
 562         /* get required compiler data */
 563
 564         cd = jd->cd;
 565
 566         /* generate code patching stub call code */
 567
 568         targetdisp = 0;
 569
 570         for (pref = cd->patchrefs; pref != NULL; pref = pref->next) {
 571                 /* check code segment size */
 572
 573                 MCODECHECK(100);
 574
 575                 /* Get machine code which is patched back in later. The
 576                    call is 1 instruction word long. */
 577
 578                 tmpmcodeptr = (u1 *) (cd->mcodebase + pref->branchpos);
 579
 580                 mcode = *((u4 *) tmpmcodeptr);
 581
 582                 /* Patch in the call to call the following code (done at
 583                    compile time). */
 584
 585                 savedmcodeptr = cd->mcodeptr;   /* save current mcodeptr          */
 586                 cd->mcodeptr  = tmpmcodeptr;    /* set mcodeptr to patch position */
 587
 588                 disp = ((u4 *) savedmcodeptr) - (((u4 *) tmpmcodeptr) + 1);
 589                 M_BR(disp);
 590
 591                 cd->mcodeptr = savedmcodeptr;   /* restore the current mcodeptr   */
 592
 593                 /* create stack frame - keep stack 16-byte aligned */
 594
 595                 M_AADD_IMM(REG_SP, -8 * 4, REG_SP);
 596
 597                 /* calculate return address and move it onto the stack */
 598
 599                 M_LDA(REG_ITMP3, REG_PV, pref->branchpos);
 600                 M_AST_INTERN(REG_ITMP3, REG_SP, 5 * 4);
 601
 602                 /* move pointer to java_objectheader onto stack */
 603
 604 #if defined(ENABLE_THREADS)
 605                 /* order reversed because of data segment layout */
 606
 607                 (void) dseg_add_unique_address(cd, NULL);                  /* flcword */
 608                 (void) dseg_add_unique_address(cd, lock_get_initial_lock_word());
 609                 disp = dseg_add_unique_address(cd, NULL);                  /* vftbl   */
 610
 611                 M_LDA(REG_ITMP3, REG_PV, disp);
 612                 M_AST_INTERN(REG_ITMP3, REG_SP, 4 * 4);
 613 #else
 614                 /* do nothing */
 615 #endif
 616
 617                 /* move machine code onto stack */
 618
 619                 disp = dseg_add_s4(cd, mcode);
 620                 M_ILD(REG_ITMP3, REG_PV, disp);
 621                 M_IST_INTERN(REG_ITMP3, REG_SP, 3 * 4);
 622
 623                 /* move class/method/field reference onto stack */
 624
 625                 disp = dseg_add_address(cd, pref->ref);
 626                 M_ALD(REG_ITMP3, REG_PV, disp);
 627                 M_AST_INTERN(REG_ITMP3, REG_SP, 2 * 4);
 628
 629                 /* move data segment displacement onto stack */
 630
 631                 disp = dseg_add_s4(cd, pref->disp);
 632                 M_ILD(REG_ITMP3, REG_PV, disp);
 633                 M_IST_INTERN(REG_ITMP3, REG_SP, 1 * 4);
 634
 635                 /* move patcher function pointer onto stack */
 636
 637                 disp = dseg_add_functionptr(cd, pref->patcher);
 638                 M_ALD(REG_ITMP3, REG_PV, disp);
 639                 M_AST_INTERN(REG_ITMP3, REG_SP, 0 * 4);
 640
 641                 if (targetdisp == 0) {
 642                         targetdisp = ((u4 *) cd->mcodeptr) - ((u4 *) cd->mcodebase);
 643
 644                         disp = dseg_add_functionptr(cd, asm_patcher_wrapper);
 645                         M_ALD(REG_ITMP3, REG_PV, disp);
 646                         M_MTCTR(REG_ITMP3);
 647                         M_RTS;
 648                 }
 649                 else {
 650                         disp = (((u4 *) cd->mcodebase) + targetdisp) -
 651                                 (((u4 *) cd->mcodeptr) + 1);
 652                         M_BR(disp);
 653                 }
 654         }
 655 }
 656
 657
 658 /* emit_replacement_stubs ******************************************************
 659
 660    Generates the code for the replacement stubs.
 661
 662 *******************************************************************************/
 663
 664 void emit_replacement_stubs(jitdata *jd)
 665 {
 666         codegendata *cd;
 667         codeinfo    *code;
 668         rplpoint    *rplp;
 669         u1          *savedmcodeptr;
 670         s4           disp;
 671         s4           i;
 672
 673         /* get required compiler data */
 674
 675         cd   = jd->cd;
 676         code = jd->code;
 677
 678         rplp = code->rplpoints;
 679
 680         for (i = 0; i < code->rplpointcount; ++i, ++rplp) {
 681                 /* check code segment size */
 682
 683                 MCODECHECK(100);
 684
 685                 /* note start of stub code */
 686
 687                 rplp->outcode = (u1 *) (cd->mcodeptr - cd->mcodebase);
 688
 689                 /* make machine code for patching */
 690
 691                 savedmcodeptr = cd->mcodeptr;
 692                 cd->mcodeptr  = (u1 *) &(rplp->mcode) + 1;              /* big-endian */
 693
 694                 disp = (ptrint) ((s4 *) rplp->outcode - (s4 *) rplp->pc) - 1;
 695                 M_BR(disp);
 696
 697                 cd->mcodeptr = savedmcodeptr;
 698
 699                 /* create stack frame - keep 16-byte aligned */
 700
 701                 M_AADD_IMM(REG_SP, -4 * 4, REG_SP);
 702
 703                 /* push address of `rplpoint` struct */
 704
 705                 disp = dseg_add_address(cd, rplp);
 706                 M_ALD(REG_ITMP3, REG_PV, disp);
 707                 M_AST_INTERN(REG_ITMP3, REG_SP, 0 * 4);
 708
 709                 /* jump to replacement function */
 710
 711                 disp = dseg_add_functionptr(cd, asm_replacement_out);
 712                 M_ALD(REG_ITMP3, REG_PV, disp);
 713                 M_MTCTR(REG_ITMP3);
 714                 M_RTS;
 715         }
 716 }
 717
 718
 719 /* emit_verbosecall_enter ******************************************************
 720
 721    Generates the code for the call trace.
 722
 723 *******************************************************************************/
 724
 725 void emit_verbosecall_enter(jitdata *jd)
 726 {
 727         methodinfo   *m;
 728         codegendata  *cd;
 729         registerdata *rd;
 730         s4 s1, p, t, d;
 731         int stack_off;
 732         int stack_size;
 733         methoddesc *md;
 734
 735         /* get required compiler data */
 736
 737         m  = jd->m;
 738         cd = jd->cd;
 739         rd = jd->rd;
 740
 741         md = m->parseddesc;
 742
 743         /* Build up Stackframe for builtin_trace_args call (a multiple of 16) */
 744         /* For Darwin:                                                        */
 745         /* LA + TRACE_ARGS_NUM u8 args + methodinfo + LR                      */
 746         /* LA_SIZE(=6*4) + 8*8         + 4          + 4  + 0(Padding)         */
 747         /* 6 * 4 + 8 * 8 + 2 * 4 = 12 * 8 = 6 * 16                            */
 748         /* For Linux:                                                         */
 749         /* LA + (TRACE_ARGS_NUM - INT_ARG_CNT/2) u8 args + methodinfo         */
 750         /* + INT_ARG_CNT * 4 ( save integer registers) + LR + 8 + 8 (Padding) */
 751         /* LA_SIZE(=2*4) + 4 * 8 + 4 + 8 * 4 + 4 + 8                          */
 752         /* 2 * 4 + 4 * 8 + 10 * 4 + 1 * 8 + 8= 12 * 8 = 6 * 16                */
 753
 754         /* in nativestubs no Place to save the LR (Link Register) would be needed */
 755         /* but since the stack frame has to be aligned the 4 Bytes would have to  */
 756         /* be padded again */
 757
 758 #if defined(__DARWIN__)
 759         stack_size = LA_SIZE + (TRACE_ARGS_NUM + 1) * 8;
 760 #else
 761         stack_size = 6 * 16;
 762 #endif
 763
 764         /* mark trace code */
 765
 766         M_NOP;
 767
 768         M_MFLR(REG_ZERO);
 769         M_AST(REG_ZERO, REG_SP, LA_LR_OFFSET);
 770         M_STWU(REG_SP, REG_SP, -stack_size);
 771
 772         M_CLR(REG_ITMP1);    /* clear help register */
 773
 774         /* save up to TRACE_ARGS_NUM arguments into the reserved stack space */
 775 #if defined(__DARWIN__)
 776         /* Copy Params starting from first to Stack                          */
 777         /* since TRACE_ARGS == INT_ARG_CNT all used integer argument regs    */
 778         /* are saved                                                         */
 779         p = 0;
 780 #else
 781         /* Copy Params starting from fifth to Stack (INT_ARG_CNT/2) are in   */
 782         /* integer argument regs                                             */
 783         /* all integer argument registers have to be saved                   */
 784         for (p = 0; p < 8; p++) {
 785                 d = rd->argintregs[p];
 786                 /* save integer argument registers */
 787                 M_IST(d, REG_SP, LA_SIZE + 4 * 8 + 4 + p * 4);
 788         }
 789         p = 4;
 790 #endif
 791         stack_off = LA_SIZE;
 792         for (; p < md->paramcount && p < TRACE_ARGS_NUM; p++, stack_off += 8) {
 793                 t = md->paramtypes[p].type;
 794                 if (IS_INT_LNG_TYPE(t)) {
 795                         if (!md->params[p].inmemory) { /* Param in Arg Reg */
 796                                 if (IS_2_WORD_TYPE(t)) {
 797                                         M_IST(rd->argintregs[GET_HIGH_REG(md->params[p].regoff)]
 798                                                   , REG_SP, stack_off);
 799                                         M_IST(rd->argintregs[GET_LOW_REG(md->params[p].regoff)]
 800                                                   , REG_SP, stack_off + 4);
 801                                 } else {
 802                                         M_IST(REG_ITMP1, REG_SP, stack_off);
 803                                         M_IST(rd->argintregs[md->params[p].regoff]
 804                                                   , REG_SP, stack_off + 4);
 805                                 }
 806                         } else { /* Param on Stack */
 807                                 s1 = (md->params[p].regoff + cd->stackframesize) * 4
 808                                         + stack_size;
 809                                 if (IS_2_WORD_TYPE(t)) {
 810                                         M_ILD(REG_ITMP2, REG_SP, s1);
 811                                         M_IST(REG_ITMP2, REG_SP, stack_off);
 812                                         M_ILD(REG_ITMP2, REG_SP, s1 + 4);
 813                                         M_IST(REG_ITMP2, REG_SP, stack_off + 4);
 814                                 } else {
 815                                         M_IST(REG_ITMP1, REG_SP, stack_off);
 816                                         M_ILD(REG_ITMP2, REG_SP, s1);
 817                                         M_IST(REG_ITMP2, REG_SP, stack_off + 4);
 818                                 }
 819                         }
 820                 } else { /* IS_FLT_DBL_TYPE(t) */
 821                         if (!md->params[p].inmemory) { /* in Arg Reg */
 822                                 s1 = rd->argfltregs[md->params[p].regoff];
 823                                 if (!IS_2_WORD_TYPE(t)) {
 824                                         M_IST(REG_ITMP1, REG_SP, stack_off);
 825                                         M_FST(s1, REG_SP, stack_off + 4);
 826                                 } else {
 827                                         M_DST(s1, REG_SP, stack_off);
 828                                 }
 829                         } else { /* on Stack */
 830                                 /* this should not happen */
 831                         }
 832                 }
 833         }
 834
 835         /* load first 4 (==INT_ARG_CNT/2) arguments into integer registers */
 836 #if defined(__DARWIN__)
 837         for (p = 0; p < 8; p++) {
 838                 d = rd->argintregs[p];
 839                 M_ILD(d, REG_SP, LA_SIZE + p * 4);
 840         }
 841 #else
 842         /* LINUX */
 843         /* Set integer and float argument registers vor trace_args call */
 844         /* offset to saved integer argument registers                   */
 845         stack_off = LA_SIZE + 4 * 8 + 4;
 846         for (p = 0; (p < 4) && (p < md->paramcount); p++) {
 847                 t = md->paramtypes[p].type;
 848                 if (IS_INT_LNG_TYPE(t)) {
 849                         /* "stretch" int types */
 850                         if (!IS_2_WORD_TYPE(t)) {
 851                                 M_CLR(rd->argintregs[2 * p]);
 852                                 M_ILD(rd->argintregs[2 * p + 1], REG_SP,stack_off);
 853                                 stack_off += 4;
 854                         } else {
 855                                 M_ILD(rd->argintregs[2 * p + 1], REG_SP,stack_off + 4);
 856                                 M_ILD(rd->argintregs[2 * p], REG_SP,stack_off);
 857                                 stack_off += 8;
 858                         }
 859                 } else { /* Float/Dbl */
 860                         if (!md->params[p].inmemory) { /* Param in Arg Reg */
 861                                 /* use reserved Place on Stack (sp + 5 * 16) to copy  */
 862                                 /* float/double arg reg to int reg                    */
 863                                 s1 = rd->argfltregs[md->params[p].regoff];
 864                                 if (!IS_2_WORD_TYPE(t)) {
 865                                         M_FST(s1, REG_SP, 5 * 16);
 866                                         M_ILD(rd->argintregs[2 * p + 1], REG_SP, 5 * 16);
 867                                         M_CLR(rd->argintregs[2 * p]);
 868                                 } else {
 869                                         M_DST(s1, REG_SP, 5 * 16);
 870                                         M_ILD(rd->argintregs[2 * p + 1], REG_SP,  5 * 16 + 4);
 871                                         M_ILD(rd->argintregs[2 * p], REG_SP, 5 * 16);
 872                                 }
 873                         }
 874                 }
 875         }
 876 #endif
 877
 878         /* put methodinfo pointer on Stackframe */
 879         p = dseg_add_address(cd, m);
 880         M_ALD(REG_ITMP1, REG_PV, p);
 881 #if defined(__DARWIN__)
 882         M_AST(REG_ITMP1, REG_SP, LA_SIZE + TRACE_ARGS_NUM * 8);
 883 #else
 884         M_AST(REG_ITMP1, REG_SP, LA_SIZE + 4 * 8);
 885 #endif
 886         p = dseg_add_functionptr(cd, builtin_trace_args);
 887         M_ALD(REG_ITMP2, REG_PV, p);
 888         M_MTCTR(REG_ITMP2);
 889         M_JSR;
 890
 891 #if defined(__DARWIN__)
 892         /* restore integer argument registers from the reserved stack space */
 893
 894         stack_off = LA_SIZE;
 895         for (p = 0; p < md->paramcount && p < TRACE_ARGS_NUM;
 896                  p++, stack_off += 8) {
 897                 t = md->paramtypes[p].type;
 898
 899                 if (IS_INT_LNG_TYPE(t)) {
 900                         if (!md->params[p].inmemory) {
 901                                 if (IS_2_WORD_TYPE(t)) {
 902                                         M_ILD(rd->argintregs[GET_HIGH_REG(md->params[p].regoff)]
 903                                                   , REG_SP, stack_off);
 904                                         M_ILD(rd->argintregs[GET_LOW_REG(md->params[p].regoff)]
 905                                                   , REG_SP, stack_off + 4);
 906                                 } else {
 907                                         M_ILD(rd->argintregs[md->params[p].regoff]
 908                                                   , REG_SP, stack_off + 4);
 909                                 }
 910                         }
 911                 }
 912         }
 913 #else
 914         /* LINUX */
 915         for (p = 0; p < 8; p++) {
 916                 d = rd->argintregs[p];
 917                 /* save integer argument registers */
 918                 M_ILD(d, REG_SP, LA_SIZE + 4 * 8 + 4 + p * 4);
 919         }
 920 #endif
 921
 922         M_ALD(REG_ZERO, REG_SP, stack_size + LA_LR_OFFSET);
 923         M_MTLR(REG_ZERO);
 924         M_LDA(REG_SP, REG_SP, stack_size);
 925
 926         /* mark trace code */
 927
 928         M_NOP;
 929 }
 930
 931
 932 /* emit_verbosecall_exit *******************************************************
 933
 934    Generates the code for the call trace.
 935
 936 *******************************************************************************/
 937
 938 void emit_verbosecall_exit(jitdata *jd)
 939 {
 940         methodinfo   *m;
 941         codegendata  *cd;
 942         registerdata *rd;
 943         methoddesc   *md;
 944         s4            disp;
 945
 946         /* get required compiler data */
 947
 948         m  = jd->m;
 949         cd = jd->cd;
 950         rd = jd->rd;
 951
 952         md = m->parseddesc;
 953
 954         /* mark trace code */
 955
 956         M_NOP;
 957
 958         M_MFLR(REG_ZERO);
 959         M_AST(REG_ZERO, REG_SP, LA_LR_OFFSET);
 960         M_STWU(REG_SP, REG_SP, -(LA_SIZE + (1 + 2 + 2 + 1 + 4) * 4));
 961
 962         /* save return registers */
 963
 964         M_LST(REG_RESULT_PACKED, REG_SP, LA_SIZE + (1 + 2 + 2 + 1 + 0) * 4);
 965         M_DST(REG_FRESULT, REG_SP, LA_SIZE + (1 + 2 + 2 + 1 + 2) * 4);
 966
 967         /* keep this order */
 968         switch (md->returntype.type) {
 969         case TYPE_INT:
 970         case TYPE_ADR:
 971 #if defined(__DARWIN__)
 972                 M_MOV(REG_RESULT, rd->argintregs[2]);
 973                 M_CLR(rd->argintregs[1]);
 974 #else
 975                 M_MOV(REG_RESULT, rd->argintregs[3]);
 976                 M_CLR(rd->argintregs[2]);
 977 #endif
 978                 break;
 979
 980         case TYPE_LNG:
 981 #if defined(__DARWIN__)
 982                 M_MOV(REG_RESULT2, rd->argintregs[2]);
 983                 M_MOV(REG_RESULT, rd->argintregs[1]);
 984 #else
 985                 M_MOV(REG_RESULT2, rd->argintregs[3]);
 986                 M_MOV(REG_RESULT, rd->argintregs[2]);
 987 #endif
 988                 break;
 989         }
 990
 991         M_FLTMOVE(REG_FRESULT, rd->argfltregs[0]);
 992         M_FLTMOVE(REG_FRESULT, rd->argfltregs[1]);
 993
 994         disp = dseg_add_address(cd, m);
 995         M_ALD(rd->argintregs[0], REG_PV, disp);
 996
 997         disp = dseg_add_functionptr(cd, builtin_displaymethodstop);
 998         M_ALD(REG_ITMP2, REG_PV, disp);
 999         M_MTCTR(REG_ITMP2);
1000         M_JSR;
1001
1002         /* restore return registers */
1003
1004         M_LLD(REG_RESULT_PACKED, REG_SP, LA_SIZE + (1 + 2 + 2 + 1 + 0) * 4);
1005         M_DLD(REG_FRESULT, REG_SP, LA_SIZE + (1 + 2 + 2 + 1 + 2) * 4);
1006
1007         M_ALD(REG_ZERO, REG_SP, LA_SIZE + (1 + 2 + 2 + 1 + 4) * 4 + LA_LR_OFFSET);
1008         M_MTLR(REG_ZERO);
1009         M_LDA(REG_SP, REG_SP, LA_SIZE + (1 + 2 + 2 + 1 + 4) * 4);
1010
1011         /* mark trace code */
1012
1013         M_NOP;
1014 }
1015
1016
1017 /*
1018  * These are local overrides for various environment variables in Emacs.
1019  * Please do not remove this and leave it at the end of the file, where
1020  * Emacs will automagically detect them.
1021  * ---------------------------------------------------------------------
1022  * Local variables:
1023  * mode: c
1024  * indent-tabs-mode: t
1025  * c-basic-offset: 4
1026  * tab-width: 4
1027  * End:
1028  * vim:noexpandtab:sw=4:ts=4:
1029  */