ghc/includes/Regs.h

   1 /* -----------------------------------------------------------------------------
   2  * $Id: Regs.h,v 1.11 2002/01/24 00:40:28 sof Exp $
   3  *
   4  * (c) The GHC Team, 1998-1999
   5  *
   6  * Registers used in STG code.  Might or might not correspond to
   7  * actual machine registers.
   8  *
   9  * ---------------------------------------------------------------------------*/
  10
  11 #ifndef REGS_H
  12 #define REGS_H
  13
  14 /*
  15  * This file should do the right thing if we have no machine-registers
  16  * defined, i.e. everything lives in the RegTable.
  17  */
  18
  19 /*
  20  * This is the table that holds shadow-locations for all the STG
  21  * registers.  The shadow locations are used when:
  22  *
  23  *     1) the particular register isn't mapped to a real machine
  24  *        register, probably because there's a shortage of real registers.
  25  *     2) caller-saves registers are saved across a CCall
  26  */
  27
  28 typedef struct StgSparkPool_ {
  29   StgClosure **base;
  30   StgClosure **lim;
  31   StgClosure **hd;
  32   StgClosure **tl;
  33 } StgSparkPool;
  34
  35 typedef struct {
  36   StgFunPtr      stgChk0;
  37   StgFunPtr      stgChk1;
  38   StgFunPtr      stgGCEnter1;
  39   StgFunPtr      stgUpdatePAP;
  40 } StgFunTable;
  41
  42 typedef struct StgRegTable_ {
  43   StgUnion        rR1;
  44   StgUnion        rR2;
  45   StgUnion        rR3;
  46   StgUnion        rR4;
  47   StgUnion        rR5;
  48   StgUnion        rR6;
  49   StgUnion        rR7;
  50   StgUnion        rR8;
  51   StgUnion        rR9;          // used occasionally by heap/stack checks
  52   StgUnion        rR10;         // used occasionally by heap/stack checks
  53   StgFloat        rF1;
  54   StgFloat        rF2;
  55   StgFloat        rF3;
  56   StgFloat        rF4;
  57   StgDouble       rD1;
  58   StgDouble       rD2;
  59   StgWord64       rL1;
  60   StgPtr          rSp;
  61   StgUpdateFrame *rSu;
  62   StgPtr          rSpLim;
  63   StgPtr          rHp;
  64   StgPtr          rHpLim;
  65   StgTSO         *rCurrentTSO;
  66   struct _bdescr *rNursery;
  67   struct _bdescr *rCurrentNursery;
  68   StgWord         rHpAlloc;     // number of words being allocated in heap
  69 #if defined(SMP) || defined(PAR)
  70   StgSparkPool   rSparks;       // per-task spark pool
  71 #endif
  72 } StgRegTable;
  73
  74
  75 /* A capability is a combination of a FunTable and a RegTable.  In STG
  76  * code, BaseReg normally points to the RegTable portion of this
  77  * structure, so that we can index both forwards and backwards to take
  78  * advantage of shorter instruction forms on some archs (eg. x86).
  79  */
  80 typedef struct Capability_ {
  81     StgFunTable f;
  82     StgRegTable r;
  83 #if defined(SMP)
  84   struct Capability_ *link;     /* per-task register tables are linked together */
  85 #endif
  86 } Capability;
  87
  88 /* No such thing as a MainRegTable under SMP - each thread must
  89  * have its own MainRegTable.
  90  */
  91 #ifndef SMP
  92 extern DLL_IMPORT_RTS Capability  MainCapability;
  93 #endif
  94
  95 #if IN_STG_CODE
  96
  97 /*
  98  * Registers Hp and HpLim are global across the entire system, and are
  99  * copied into the RegTable before executing a thread.
 100  *
 101  * Registers Sp, Su, and SpLim are saved in the TSO for the
 102  * thread, but are copied into the RegTable before executing a thread.
 103  *
 104  * All other registers are "general purpose", and are used for passing
 105  * arguments to functions, and returning values.  The code generator
 106  * knows how many of these are in real registers, and avoids
 107  * generating code that uses non-real registers.  General purpose
 108  * registers are never saved when returning to the scheduler, instead
 109  * we save whatever is live at the time on the stack, and restore it
 110  * later.  This should reduce the context switch time, amongst other
 111  * things.
 112  *
 113  * For argument passing, the stack will be used in preference to
 114  * pseudo-registers if the architecture has too few general purpose
 115  * registers.
 116  *
 117  * Some special RTS functions like newArray and the Integer primitives
 118  * expect their arguments to be in registers R1-Rn, so we use these
 119  * (pseudo-)registers in those cases.
 120  */
 121
 122 /*
 123  * Locations for saving per-thread registers.
 124  */
 125
 126 #define SAVE_Sp             (CurrentTSO->sp)
 127 #define SAVE_Su             (CurrentTSO->su)
 128 #define SAVE_SpLim          (CurrentTSO->splim)
 129
 130 #define SAVE_Hp             (BaseReg->rHp)
 131 #define SAVE_HpLim          (BaseReg->rHpLim)
 132
 133 #define SAVE_CurrentTSO     (BaseReg->rCurrentTSO)
 134 #define SAVE_CurrentNursery (BaseReg->rCurrentNursery)
 135 #define SAVE_HpAlloc        (BaseReg->rHpAlloc)
 136 #if defined(SMP) || defined(PAR)
 137 #define SAVE_SparkHd        (BaseReg->rSparks.hd)
 138 #define SAVE_SparkTl        (BaseReg->rSparks.tl)
 139 #define SAVE_SparkBase      (BaseReg->rSparks.base)
 140 #define SAVE_SparkLim       (BaseReg->rSparks.lim)
 141 #endif
 142
 143 /* We sometimes need to save registers across a C-call, eg. if they
 144  * are clobbered in the standard calling convention.  We define the
 145  * save locations for all registers in the register table.
 146  */
 147
 148 #define SAVE_R1             (BaseReg->rR1)
 149 #define SAVE_R2             (BaseReg->rR2)
 150 #define SAVE_R3             (BaseReg->rR3)
 151 #define SAVE_R4             (BaseReg->rR4)
 152 #define SAVE_R5             (BaseReg->rR5)
 153 #define SAVE_R6             (BaseReg->rR6)
 154 #define SAVE_R7             (BaseReg->rR7)
 155 #define SAVE_R8             (BaseReg->rR8)
 156
 157 #define SAVE_F1             (BaseReg->rF1)
 158 #define SAVE_F2             (BaseReg->rF2)
 159 #define SAVE_F3             (BaseReg->rF3)
 160 #define SAVE_F4             (BaseReg->rF4)
 161
 162 #define SAVE_D1             (BaseReg->rD1)
 163 #define SAVE_D2             (BaseReg->rD2)
 164
 165 #define SAVE_L1             (BaseReg->rL1)
 166
 167 /* -----------------------------------------------------------------------------
 168  * Emit the GCC-specific register declarations for each machine
 169  * register being used.  If any STG register isn't mapped to a machine
 170  * register, then map it to an offset from BaseReg.
 171  *
 172  * First, the general purpose registers.  The idea is, if a particular
 173  * general-purpose STG register can't be mapped to a real machine
 174  * register, it won't be used at all.  Instead, we'll use the stack.
 175  *
 176  * This is an improvement on the way things used to be done, when all
 177  * registers were mapped to locations in the register table, and stuff
 178  * was being shifted from the stack to the register table and back
 179  * again for no good reason (on register-poor architectures).
 180  */
 181
 182 #define GLOBAL_REG_DECL(type,name,reg) register type name REG(reg);
 183
 184 #ifdef REG_R1
 185 GLOBAL_REG_DECL(StgUnion,R1,REG_R1)
 186 #else
 187 #define R1 (BaseReg->rR1)
 188 #endif
 189
 190 #ifdef REG_R2
 191 GLOBAL_REG_DECL(StgUnion,R2,REG_R2)
 192 #else
 193 #define R2 (BaseReg->rR2)
 194 #endif
 195
 196 #ifdef REG_R3
 197 GLOBAL_REG_DECL(StgUnion,R3,REG_R3)
 198 #else
 199 # define R3 (BaseReg->rR3)
 200 #endif
 201
 202 #ifdef REG_R4
 203 GLOBAL_REG_DECL(StgUnion,R4,REG_R4)
 204 #else
 205 # define R4 (BaseReg->rR4)
 206 #endif
 207
 208 #ifdef REG_R5
 209 GLOBAL_REG_DECL(StgUnion,R5,REG_R5)
 210 #else
 211 # define R5 (BaseReg->rR5)
 212 #endif
 213
 214 #ifdef REG_R6
 215 GLOBAL_REG_DECL(StgUnion,R6,REG_R6)
 216 #else
 217 # define R6 (BaseReg->rR6)
 218 #endif
 219
 220 #ifdef REG_R7
 221 GLOBAL_REG_DECL(StgUnion,R7,REG_R7)
 222 #else
 223 # define R7 (BaseReg->rR7)
 224 #endif
 225
 226 #ifdef REG_R8
 227 GLOBAL_REG_DECL(StgUnion,R8,REG_R8)
 228 #else
 229 # define R8 (BaseReg->rR8)
 230 #endif
 231
 232 #ifdef REG_R9
 233 GLOBAL_REG_DECL(StgUnion,R9,REG_R9)
 234 #else
 235 # define R9 (BaseReg->rR9)
 236 #endif
 237
 238 #ifdef REG_R10
 239 GLOBAL_REG_DECL(StgUnion,R10,REG_R10)
 240 #else
 241 # define R10 (BaseReg->rR10)
 242 #endif
 243
 244 #ifdef REG_F1
 245 GLOBAL_REG_DECL(StgFloat,F1,REG_F1)
 246 #else
 247 #define F1 (BaseReg->rF1)
 248 #endif
 249
 250 #ifdef REG_F2
 251 GLOBAL_REG_DECL(StgFloat,F2,REG_F2)
 252 #else
 253 #define F2 (BaseReg->rF2)
 254 #endif
 255
 256 #ifdef REG_F3
 257 GLOBAL_REG_DECL(StgFloat,F3,REG_F3)
 258 #else
 259 #define F3 (BaseReg->rF3)
 260 #endif
 261
 262 #ifdef REG_F4
 263 GLOBAL_REG_DECL(StgFloat,F4,REG_F4)
 264 #else
 265 #define F4 (BaseReg->rF4)
 266 #endif
 267
 268 #ifdef REG_D1
 269 GLOBAL_REG_DECL(StgDouble,D1,REG_D1)
 270 #else
 271 #define D1 (BaseReg->rD1)
 272 #endif
 273
 274 #ifdef REG_D2
 275 GLOBAL_REG_DECL(StgDouble,D2,REG_D2)
 276 #else
 277 #define D2 (BaseReg->rD2)
 278 #endif
 279
 280 #ifdef REG_L1
 281 GLOBAL_REG_DECL(StgWord64,L1,REG_L1)
 282 #else
 283 #define L1 (BaseReg->rL1)
 284 #endif
 285
 286 /*
 287  * If BaseReg isn't mapped to a machine register, just use the global
 288  * address of the current register table (CurrentRegTable in
 289  * concurrent Haskell, MainRegTable otherwise).
 290  */
 291
 292 #ifdef REG_Base
 293 GLOBAL_REG_DECL(StgRegTable *,BaseReg,REG_Base)
 294 #else
 295 #ifdef SMP
 296 #error BaseReg must be in a register for SMP
 297 #endif
 298 #define BaseReg (&MainCapability.r)
 299 #endif
 300
 301 #ifdef REG_Sp
 302 GLOBAL_REG_DECL(P_,Sp,REG_Sp)
 303 #else
 304 #define Sp (BaseReg->rSp)
 305 #endif
 306
 307 #ifdef REG_Su
 308 GLOBAL_REG_DECL(StgUpdateFrame *,Su,REG_Su)
 309 #else
 310 #define Su (BaseReg->rSu)
 311 #endif
 312
 313 #ifdef REG_SpLim
 314 GLOBAL_REG_DECL(P_,SpLim,REG_SpLim)
 315 #else
 316 #define SpLim (BaseReg->rSpLim)
 317 #endif
 318
 319 #ifdef REG_Hp
 320 GLOBAL_REG_DECL(P_,Hp,REG_Hp)
 321 #else
 322 #define Hp (BaseReg->rHp)
 323 #endif
 324
 325 #ifdef REG_HpLim
 326 GLOBAL_REG_DECL(P_,HpLim,REG_HpLim)
 327 #else
 328 #define HpLim (BaseReg->rHpLim)
 329 #endif
 330
 331 #ifdef REG_CurrentTSO
 332 GLOBAL_REG_DECL(StgTSO *,CurrentTSO,REG_CurrentTSO)
 333 #else
 334 #define CurrentTSO (BaseReg->rCurrentTSO)
 335 #endif
 336
 337 #ifdef REG_CurrentNursery
 338 GLOBAL_REG_DECL(bdescr *,CurrentNursery,REG_CurrentNursery)
 339 #else
 340 #define CurrentNursery (BaseReg->rCurrentNursery)
 341 #endif
 342
 343 #ifdef REG_HpAlloc
 344 GLOBAL_REG_DECL(bdescr *,HpAlloc,REG_HpAlloc)
 345 #else
 346 #define HpAlloc (BaseReg->rHpAlloc)
 347 #endif
 348
 349 #ifdef REG_SparkHd
 350 GLOBAL_REG_DECL(bdescr *,SparkHd,REG_SparkHd)
 351 #else
 352 #define SparkHd (BaseReg->rSparks.hd)
 353 #endif
 354
 355 #ifdef REG_SparkTl
 356 GLOBAL_REG_DECL(bdescr *,SparkTl,REG_SparkTl)
 357 #else
 358 #define SparkTl (BaseReg->rSparks.tl)
 359 #endif
 360
 361 #ifdef REG_SparkBase
 362 GLOBAL_REG_DECL(bdescr *,SparkBase,REG_SparkBase)
 363 #else
 364 #define SparkBase (BaseReg->rSparks.base)
 365 #endif
 366
 367 #ifdef REG_SparkLim
 368 GLOBAL_REG_DECL(bdescr *,SparkLim,REG_SparkLim)
 369 #else
 370 #define SparkLim (BaseReg->rSparks.lim)
 371 #endif
 372
 373 /* -----------------------------------------------------------------------------
 374    Get absolute function pointers from the register table, to save
 375    code space.  On x86,
 376
 377        jmp  *-12(%ebx)
 378
 379    is shorter than
 380
 381        jmp absolute_address
 382
 383    as long as the offset is within the range of a signed byte
 384    (-128..+127).  So we pick some common absolute_addresses and put
 385    them in the register table.  As a bonus, linking time should also
 386    be reduced.
 387
 388    Other possible candidates in order of importance:
 389
 390      stg_upd_frame_info
 391      stg_CAF_BLACKHOLE_info
 392      stg_IND_STATIC_info
 393
 394    anything else probably isn't worth the effort.
 395
 396    -------------------------------------------------------------------------- */
 397
 398
 399 #define FunReg ((StgFunTable *)((void *)BaseReg - sizeof(StgFunTable)))
 400
 401 #define stg_chk_0          (FunReg->stgChk0)
 402 #define stg_chk_1          (FunReg->stgChk1)
 403 #define stg_gc_enter_1     (FunReg->stgGCEnter1)
 404 #define stg_update_PAP     (FunReg->stgUpdatePAP)
 405
 406 /* -----------------------------------------------------------------------------
 407    For any registers which are denoted "caller-saves" by the C calling
 408    convention, we have to emit code to save and restore them across C
 409    calls.
 410    -------------------------------------------------------------------------- */
 411
 412 #ifdef CALLER_SAVES_R1
 413 #define CALLER_SAVE_R1          SAVE_R1 = R1;
 414 #define CALLER_RESTORE_R1       R1 = SAVE_R1;
 415 #else
 416 #define CALLER_SAVE_R1          /* nothing */
 417 #define CALLER_RESTORE_R1       /* nothing */
 418 #endif
 419
 420 #ifdef CALLER_SAVES_R2
 421 #define CALLER_SAVE_R2          SAVE_R2 = R2;
 422 #define CALLER_RESTORE_R2       R2 = SAVE_R2;
 423 #else
 424 #define CALLER_SAVE_R2          /* nothing */
 425 #define CALLER_RESTORE_R2       /* nothing */
 426 #endif
 427
 428 #ifdef CALLER_SAVES_R3
 429 #define CALLER_SAVE_R3          SAVE_R3 = R3;
 430 #define CALLER_RESTORE_R3       R3 = SAVE_R3;
 431 #else
 432 #define CALLER_SAVE_R3          /* nothing */
 433 #define CALLER_RESTORE_R3       /* nothing */
 434 #endif
 435
 436 #ifdef CALLER_SAVES_R4
 437 #define CALLER_SAVE_R4          SAVE_R4 = R4;
 438 #define CALLER_RESTORE_R4       R4 = SAVE_R4;
 439 #else
 440 #define CALLER_SAVE_R4          /* nothing */
 441 #define CALLER_RESTORE_R4       /* nothing */
 442 #endif
 443
 444 #ifdef CALLER_SAVES_R5
 445 #define CALLER_SAVE_R5          SAVE_R5 = R5;
 446 #define CALLER_RESTORE_R5       R5 = SAVE_R5;
 447 #else
 448 #define CALLER_SAVE_R5          /* nothing */
 449 #define CALLER_RESTORE_R5       /* nothing */
 450 #endif
 451
 452 #ifdef CALLER_SAVES_R6
 453 #define CALLER_SAVE_R6          SAVE_R6 = R6;
 454 #define CALLER_RESTORE_R6       R6 = SAVE_R6;
 455 #else
 456 #define CALLER_SAVE_R6          /* nothing */
 457 #define CALLER_RESTORE_R6       /* nothing */
 458 #endif
 459
 460 #ifdef CALLER_SAVES_R7
 461 #define CALLER_SAVE_R7          SAVE_R7 = R7;
 462 #define CALLER_RESTORE_R7       R7 = SAVE_R7;
 463 #else
 464 #define CALLER_SAVE_R7          /* nothing */
 465 #define CALLER_RESTORE_R7       /* nothing */
 466 #endif
 467
 468 #ifdef CALLER_SAVES_R8
 469 #define CALLER_SAVE_R8          SAVE_R8 = R8;
 470 #define CALLER_RESTORE_R8       R8 = SAVE_R8;
 471 #else
 472 #define CALLER_SAVE_R8          /* nothing */
 473 #define CALLER_RESTORE_R8       /* nothing */
 474 #endif
 475
 476 #ifdef CALLER_SAVES_R9
 477 #define CALLER_SAVE_R9          SAVE_R9 = R9;
 478 #define CALLER_RESTORE_R9       R9 = SAVE_R9;
 479 #else
 480 #define CALLER_SAVE_R9          /* nothing */
 481 #define CALLER_RESTORE_R9       /* nothing */
 482 #endif
 483
 484 #ifdef CALLER_SAVES_R10
 485 #define CALLER_SAVE_R10         SAVE_R10 = R10;
 486 #define CALLER_RESTORE_R10      R10 = SAVE_R10;
 487 #else
 488 #define CALLER_SAVE_R10         /* nothing */
 489 #define CALLER_RESTORE_R10      /* nothing */
 490 #endif
 491
 492 #ifdef CALLER_SAVES_F1
 493 #define CALLER_SAVE_F1          SAVE_F1 = F1;
 494 #define CALLER_RESTORE_F1       F1 = SAVE_F1;
 495 #else
 496 #define CALLER_SAVE_F1          /* nothing */
 497 #define CALLER_RESTORE_F1       /* nothing */
 498 #endif
 499
 500 #ifdef CALLER_SAVES_F2
 501 #define CALLER_SAVE_F2          SAVE_F2 = F2;
 502 #define CALLER_RESTORE_F2       F2 = SAVE_F2;
 503 #else
 504 #define CALLER_SAVE_F2          /* nothing */
 505 #define CALLER_RESTORE_F2       /* nothing */
 506 #endif
 507
 508 #ifdef CALLER_SAVES_F3
 509 #define CALLER_SAVE_F3          SAVE_F3 = F3;
 510 #define CALLER_RESTORE_F3       F3 = SAVE_F3;
 511 #else
 512 #define CALLER_SAVE_F3          /* nothing */
 513 #define CALLER_RESTORE_F3       /* nothing */
 514 #endif
 515
 516 #ifdef CALLER_SAVES_F4
 517 #define CALLER_SAVE_F4          SAVE_F4 = F4;
 518 #define CALLER_RESTORE_F4       F4 = SAVE_F4;
 519 #else
 520 #define CALLER_SAVE_F4          /* nothing */
 521 #define CALLER_RESTORE_F4       /* nothing */
 522 #endif
 523
 524 #ifdef CALLER_SAVES_D1
 525 #define CALLER_SAVE_D1          SAVE_D1 = D1;
 526 #define CALLER_RESTORE_D1       D1 = SAVE_D1;
 527 #else
 528 #define CALLER_SAVE_D1          /* nothing */
 529 #define CALLER_RESTORE_D1       /* nothing */
 530 #endif
 531
 532 #ifdef CALLER_SAVES_D2
 533 #define CALLER_SAVE_D2          SAVE_D2 = D2;
 534 #define CALLER_RESTORE_D2       D2 = SAVE_D2;
 535 #else
 536 #define CALLER_SAVE_D2          /* nothing */
 537 #define CALLER_RESTORE_D2       /* nothing */
 538 #endif
 539
 540 #ifdef CALLER_SAVES_L1
 541 #define CALLER_SAVE_L1          SAVE_L1 = L1;
 542 #define CALLER_RESTORE_L1       L1 = SAVE_L1;
 543 #else
 544 #define CALLER_SAVE_L1          /* nothing */
 545 #define CALLER_RESTORE_L1       /* nothing */
 546 #endif
 547
 548 #ifdef CALLER_SAVES_Sp
 549 #define CALLER_SAVE_Sp          SAVE_Sp = Sp;
 550 #define CALLER_RESTORE_Sp       Sp = SAVE_Sp;
 551 #else
 552 #define CALLER_SAVE_Sp          /* nothing */
 553 #define CALLER_RESTORE_Sp       /* nothing */
 554 #endif
 555
 556 #ifdef CALLER_SAVES_Su
 557 #define CALLER_SAVE_Su          SAVE_Su = Su;
 558 #define CALLER_RESTORE_Su       Su = SAVE_Su;
 559 #else
 560 #define CALLER_SAVE_Su          /* nothing */
 561 #define CALLER_RESTORE_Su       /* nothing */
 562 #endif
 563
 564 #ifdef CALLER_SAVES_SpLim
 565 #define CALLER_SAVE_SpLim       SAVE_SpLim = SpLim;
 566 #define CALLER_RESTORE_SpLim    SpLim = SAVE_SpLim;
 567 #else
 568 #define CALLER_SAVE_SpLim       /* nothing */
 569 #define CALLER_RESTORE_SpLim    /* nothing */
 570 #endif
 571
 572 #ifdef CALLER_SAVES_Hp
 573 #define CALLER_SAVE_Hp          SAVE_Hp = Hp;
 574 #define CALLER_RESTORE_Hp       Hp = SAVE_Hp;
 575 #else
 576 #define CALLER_SAVE_Hp          /* nothing */
 577 #define CALLER_RESTORE_Hp       /* nothing */
 578 #endif
 579
 580 #ifdef CALLER_SAVES_HpLim
 581 #define CALLER_SAVE_HpLim       SAVE_HpLim = HpLim;
 582 #define CALLER_RESTORE_HpLim    HpLim = SAVE_HpLim;
 583 #else
 584 #define CALLER_SAVE_HpLim       /* nothing */
 585 #define CALLER_RESTORE_HpLim    /* nothing */
 586 #endif
 587
 588 #ifdef CALLER_SAVES_Base
 589 #ifdef SMP
 590 #error "Can't have caller-saved BaseReg with SMP"
 591 #endif
 592 #define CALLER_SAVE_Base        /* nothing */
 593 #define CALLER_RESTORE_Base     BaseReg = &MainRegTable;
 594 #else
 595 #define CALLER_SAVE_Base        /* nothing */
 596 #define CALLER_RESTORE_Base     /* nothing */
 597 #endif
 598
 599 #ifdef CALLER_SAVES_CurrentTSO
 600 #define CALLER_SAVE_CurrentTSO          SAVE_CurrentTSO = CurrentTSO;
 601 #define CALLER_RESTORE_CurrentTSO       CurrentTSO = SAVE_CurrentTSO;
 602 #else
 603 #define CALLER_SAVE_CurrentTSO          /* nothing */
 604 #define CALLER_RESTORE_CurrentTSO       /* nothing */
 605 #endif
 606
 607 #ifdef CALLER_SAVES_CurrentNursery
 608 #define CALLER_SAVE_CurrentNursery      SAVE_CurrentNursery = CurrentNursery;
 609 #define CALLER_RESTORE_CurrentNursery   CurrentNursery = SAVE_CurrentNursery;
 610 #else
 611 #define CALLER_SAVE_CurrentNursery      /* nothing */
 612 #define CALLER_RESTORE_CurrentNursery   /* nothing */
 613 #endif
 614
 615 #ifdef CALLER_SAVES_HpAlloc
 616 #define CALLER_SAVE_HpAlloc             SAVE_HpAlloc = HpAlloc;
 617 #define CALLER_RESTORE_HpAlloc          HpAlloc = SAVE_HpAlloc;
 618 #else
 619 #define CALLER_SAVE_HpAlloc             /* nothing */
 620 #define CALLER_RESTORE_HpAlloc          /* nothing */
 621 #endif
 622
 623 #ifdef CALLER_SAVES_SparkHd
 624 #define CALLER_SAVE_SparkHd             SAVE_SparkHd = SparkHd;
 625 #define CALLER_RESTORE_SparkHd          SparkHd = SAVE_SparkHd;
 626 #else
 627 #define CALLER_SAVE_SparkHd             /* nothing */
 628 #define CALLER_RESTORE_SparkHd          /* nothing */
 629 #endif
 630
 631 #ifdef CALLER_SAVES_SparkTl
 632 #define CALLER_SAVE_SparkTl             SAVE_SparkTl = SparkTl;
 633 #define CALLER_RESTORE_SparkTl          SparkTl = SAVE_SparkTl;
 634 #else
 635 #define CALLER_SAVE_SparkTl             /* nothing */
 636 #define CALLER_RESTORE_SparkTl          /* nothing */
 637 #endif
 638
 639 #ifdef CALLER_SAVES_SparkBase
 640 #define CALLER_SAVE_SparkBase           SAVE_SparkBase = SparkBase;
 641 #define CALLER_RESTORE_SparkBase        SparkBase = SAVE_SparkBase;
 642 #else
 643 #define CALLER_SAVE_SparkBase           /* nothing */
 644 #define CALLER_RESTORE_SparkBase        /* nothing */
 645 #endif
 646
 647 #ifdef CALLER_SAVES_SparkLim
 648 #define CALLER_SAVE_SparkLim            SAVE_SparkLim = SparkLim;
 649 #define CALLER_RESTORE_SparkLim         SparkLim = SAVE_SparkLim;
 650 #else
 651 #define CALLER_SAVE_SparkLim            /* nothing */
 652 #define CALLER_RESTORE_SparkLim         /* nothing */
 653 #endif
 654
 655 #endif /* IN_STG_CODE */
 656
 657 /* ----------------------------------------------------------------------------
 658    Handy bunches of saves/restores
 659    ------------------------------------------------------------------------  */
 660
 661 #if IN_STG_CODE
 662
 663 #define CALLER_SAVE_USER                        \
 664   CALLER_SAVE_R1                                \
 665   CALLER_SAVE_R2                                \
 666   CALLER_SAVE_R3                                \
 667   CALLER_SAVE_R4                                \
 668   CALLER_SAVE_R5                                \
 669   CALLER_SAVE_R6                                \
 670   CALLER_SAVE_R7                                \
 671   CALLER_SAVE_R8                                \
 672   CALLER_SAVE_F1                                \
 673   CALLER_SAVE_F2                                \
 674   CALLER_SAVE_F3                                \
 675   CALLER_SAVE_F4                                \
 676   CALLER_SAVE_D1                                \
 677   CALLER_SAVE_D2                                \
 678   CALLER_SAVE_L1
 679
 680      /* Save Base last, since the others may
 681         be addressed relative to it */
 682 #define CALLER_SAVE_SYSTEM                      \
 683   CALLER_SAVE_Sp                                \
 684   CALLER_SAVE_Su                                \
 685   CALLER_SAVE_SpLim                             \
 686   CALLER_SAVE_Hp                                \
 687   CALLER_SAVE_HpLim                             \
 688   CALLER_SAVE_CurrentTSO                        \
 689   CALLER_SAVE_CurrentNursery                    \
 690   CALLER_SAVE_SparkHd                           \
 691   CALLER_SAVE_SparkTl                           \
 692   CALLER_SAVE_SparkBase                         \
 693   CALLER_SAVE_SparkLim                          \
 694   CALLER_SAVE_Base
 695
 696 #define CALLER_RESTORE_USER                     \
 697   CALLER_RESTORE_R1                             \
 698   CALLER_RESTORE_R2                             \
 699   CALLER_RESTORE_R3                             \
 700   CALLER_RESTORE_R4                             \
 701   CALLER_RESTORE_R5                             \
 702   CALLER_RESTORE_R6                             \
 703   CALLER_RESTORE_R7                             \
 704   CALLER_RESTORE_R8                             \
 705   CALLER_RESTORE_F1                             \
 706   CALLER_RESTORE_F2                             \
 707   CALLER_RESTORE_F3                             \
 708   CALLER_RESTORE_F4                             \
 709   CALLER_RESTORE_D1                             \
 710   CALLER_RESTORE_D2                             \
 711   CALLER_RESTORE_L1
 712
 713      /* Restore Base first, since the others may
 714         be addressed relative to it */
 715 #define CALLER_RESTORE_SYSTEM                   \
 716   CALLER_RESTORE_Base                           \
 717   CALLER_RESTORE_Sp                             \
 718   CALLER_RESTORE_Su                             \
 719   CALLER_RESTORE_SpLim                          \
 720   CALLER_RESTORE_Hp                             \
 721   CALLER_RESTORE_HpLim                          \
 722   CALLER_RESTORE_CurrentTSO                     \
 723   CALLER_RESTORE_CurrentNursery                 \
 724   CALLER_RESTORE_SparkHd                        \
 725   CALLER_RESTORE_SparkTl                        \
 726   CALLER_RESTORE_SparkBase                      \
 727   CALLER_RESTORE_SparkLim
 728
 729 #else /* not IN_STG_CODE */
 730
 731 #define CALLER_SAVE_USER       /* nothing */
 732 #define CALLER_SAVE_SYSTEM     /* nothing */
 733 #define CALLER_RESTORE_USER    /* nothing */
 734 #define CALLER_RESTORE_SYSTEM  /* nothing */
 735
 736 #endif /* IN_STG_CODE */
 737
 738 #define CALLER_SAVE_ALL                         \
 739   CALLER_SAVE_SYSTEM                            \
 740   CALLER_SAVE_USER
 741
 742 #define CALLER_RESTORE_ALL                      \
 743   CALLER_RESTORE_SYSTEM                         \
 744   CALLER_RESTORE_USER
 745
 746 #endif /* REGS_H */
 747