ghc/includes/Regs.h

   1 /* -----------------------------------------------------------------------------
   2  * $Id: Regs.h,v 1.14 2003/11/14 14:28:08 stolz 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      stgGCEnter1;
  37   StgFunPtr      stgGCFun;
  38 } StgFunTable;
  39
  40 typedef struct StgRegTable_ {
  41   StgUnion        rR1;
  42   StgUnion        rR2;
  43   StgUnion        rR3;
  44   StgUnion        rR4;
  45   StgUnion        rR5;
  46   StgUnion        rR6;
  47   StgUnion        rR7;
  48   StgUnion        rR8;
  49   StgUnion        rR9;          // used occasionally by heap/stack checks
  50   StgUnion        rR10;         // used occasionally by heap/stack checks
  51   StgFloat        rF1;
  52   StgFloat        rF2;
  53   StgFloat        rF3;
  54   StgFloat        rF4;
  55   StgDouble       rD1;
  56   StgDouble       rD2;
  57   StgWord64       rL1;
  58   StgPtr          rSp;
  59   StgPtr          rSpLim;
  60   StgPtr          rHp;
  61   StgPtr          rHpLim;
  62   StgTSO         *rCurrentTSO;
  63   struct _bdescr *rNursery;
  64   struct _bdescr *rCurrentNursery;
  65   StgWord         rHpAlloc;     // number of words being allocated in heap
  66 #if defined(SMP) || defined(PAR)
  67   StgSparkPool   rSparks;       // per-task spark pool
  68 #endif
  69 } StgRegTable;
  70
  71
  72 /* A capability is a combination of a FunTable and a RegTable.  In STG
  73  * code, BaseReg normally points to the RegTable portion of this
  74  * structure, so that we can index both forwards and backwards to take
  75  * advantage of shorter instruction forms on some archs (eg. x86).
  76  */
  77 typedef struct Capability_ {
  78     StgFunTable f;
  79     StgRegTable r;
  80 #if defined(SMP)
  81   struct Capability_ *link;     /* per-task register tables are linked together */
  82 #endif
  83 } Capability;
  84
  85 /* No such thing as a MainRegTable under SMP - each thread must
  86  * have its own MainRegTable.
  87  */
  88 #ifndef SMP
  89 extern DLL_IMPORT_RTS Capability  MainCapability;
  90 #endif
  91
  92 #if IN_STG_CODE
  93
  94 /*
  95  * Registers Hp and HpLim are global across the entire system, and are
  96  * copied into the RegTable before executing a thread.
  97  *
  98  * Registers Sp and SpLim are saved in the TSO for the
  99  * thread, but are copied into the RegTable before executing a thread.
 100  *
 101  * All other registers are "general purpose", and are used for passing
 102  * arguments to functions, and returning values.  The code generator
 103  * knows how many of these are in real registers, and avoids
 104  * generating code that uses non-real registers.  General purpose
 105  * registers are never saved when returning to the scheduler, instead
 106  * we save whatever is live at the time on the stack, and restore it
 107  * later.  This should reduce the context switch time, amongst other
 108  * things.
 109  *
 110  * For argument passing, the stack will be used in preference to
 111  * pseudo-registers if the architecture has too few general purpose
 112  * registers.
 113  *
 114  * Some special RTS functions like newArray and the Integer primitives
 115  * expect their arguments to be in registers R1-Rn, so we use these
 116  * (pseudo-)registers in those cases.
 117  */
 118
 119 /*
 120  * Locations for saving per-thread registers.
 121  */
 122
 123 #define SAVE_Sp             (CurrentTSO->sp)
 124 #define SAVE_SpLim          (CurrentTSO->splim)
 125
 126 #define SAVE_Hp             (BaseReg->rHp)
 127 #define SAVE_HpLim          (BaseReg->rHpLim)
 128
 129 #define SAVE_CurrentTSO     (BaseReg->rCurrentTSO)
 130 #define SAVE_CurrentNursery (BaseReg->rCurrentNursery)
 131 #define SAVE_HpAlloc        (BaseReg->rHpAlloc)
 132 #if defined(SMP) || defined(PAR)
 133 #define SAVE_SparkHd        (BaseReg->rSparks.hd)
 134 #define SAVE_SparkTl        (BaseReg->rSparks.tl)
 135 #define SAVE_SparkBase      (BaseReg->rSparks.base)
 136 #define SAVE_SparkLim       (BaseReg->rSparks.lim)
 137 #endif
 138
 139 /* We sometimes need to save registers across a C-call, eg. if they
 140  * are clobbered in the standard calling convention.  We define the
 141  * save locations for all registers in the register table.
 142  */
 143
 144 #define SAVE_R1             (BaseReg->rR1)
 145 #define SAVE_R2             (BaseReg->rR2)
 146 #define SAVE_R3             (BaseReg->rR3)
 147 #define SAVE_R4             (BaseReg->rR4)
 148 #define SAVE_R5             (BaseReg->rR5)
 149 #define SAVE_R6             (BaseReg->rR6)
 150 #define SAVE_R7             (BaseReg->rR7)
 151 #define SAVE_R8             (BaseReg->rR8)
 152
 153 #define SAVE_F1             (BaseReg->rF1)
 154 #define SAVE_F2             (BaseReg->rF2)
 155 #define SAVE_F3             (BaseReg->rF3)
 156 #define SAVE_F4             (BaseReg->rF4)
 157
 158 #define SAVE_D1             (BaseReg->rD1)
 159 #define SAVE_D2             (BaseReg->rD2)
 160
 161 #define SAVE_L1             (BaseReg->rL1)
 162
 163 /* -----------------------------------------------------------------------------
 164  * Emit the GCC-specific register declarations for each machine
 165  * register being used.  If any STG register isn't mapped to a machine
 166  * register, then map it to an offset from BaseReg.
 167  *
 168  * First, the general purpose registers.  The idea is, if a particular
 169  * general-purpose STG register can't be mapped to a real machine
 170  * register, it won't be used at all.  Instead, we'll use the stack.
 171  *
 172  * This is an improvement on the way things used to be done, when all
 173  * registers were mapped to locations in the register table, and stuff
 174  * was being shifted from the stack to the register table and back
 175  * again for no good reason (on register-poor architectures).
 176  */
 177
 178 #define GLOBAL_REG_DECL(type,name,reg) register type name REG(reg);
 179
 180 #ifdef REG_R1
 181 GLOBAL_REG_DECL(StgUnion,R1,REG_R1)
 182 #else
 183 #define R1 (BaseReg->rR1)
 184 #endif
 185
 186 #ifdef REG_R2
 187 GLOBAL_REG_DECL(StgUnion,R2,REG_R2)
 188 #else
 189 #define R2 (BaseReg->rR2)
 190 #endif
 191
 192 #ifdef REG_R3
 193 GLOBAL_REG_DECL(StgUnion,R3,REG_R3)
 194 #else
 195 # define R3 (BaseReg->rR3)
 196 #endif
 197
 198 #ifdef REG_R4
 199 GLOBAL_REG_DECL(StgUnion,R4,REG_R4)
 200 #else
 201 # define R4 (BaseReg->rR4)
 202 #endif
 203
 204 #ifdef REG_R5
 205 GLOBAL_REG_DECL(StgUnion,R5,REG_R5)
 206 #else
 207 # define R5 (BaseReg->rR5)
 208 #endif
 209
 210 #ifdef REG_R6
 211 GLOBAL_REG_DECL(StgUnion,R6,REG_R6)
 212 #else
 213 # define R6 (BaseReg->rR6)
 214 #endif
 215
 216 #ifdef REG_R7
 217 GLOBAL_REG_DECL(StgUnion,R7,REG_R7)
 218 #else
 219 # define R7 (BaseReg->rR7)
 220 #endif
 221
 222 #ifdef REG_R8
 223 GLOBAL_REG_DECL(StgUnion,R8,REG_R8)
 224 #else
 225 # define R8 (BaseReg->rR8)
 226 #endif
 227
 228 #ifdef REG_R9
 229 GLOBAL_REG_DECL(StgUnion,R9,REG_R9)
 230 #else
 231 # define R9 (BaseReg->rR9)
 232 #endif
 233
 234 #ifdef REG_R10
 235 GLOBAL_REG_DECL(StgUnion,R10,REG_R10)
 236 #else
 237 # define R10 (BaseReg->rR10)
 238 #endif
 239
 240 #ifdef REG_F1
 241 GLOBAL_REG_DECL(StgFloat,F1,REG_F1)
 242 #else
 243 #define F1 (BaseReg->rF1)
 244 #endif
 245
 246 #ifdef REG_F2
 247 GLOBAL_REG_DECL(StgFloat,F2,REG_F2)
 248 #else
 249 #define F2 (BaseReg->rF2)
 250 #endif
 251
 252 #ifdef REG_F3
 253 GLOBAL_REG_DECL(StgFloat,F3,REG_F3)
 254 #else
 255 #define F3 (BaseReg->rF3)
 256 #endif
 257
 258 #ifdef REG_F4
 259 GLOBAL_REG_DECL(StgFloat,F4,REG_F4)
 260 #else
 261 #define F4 (BaseReg->rF4)
 262 #endif
 263
 264 #ifdef REG_D1
 265 GLOBAL_REG_DECL(StgDouble,D1,REG_D1)
 266 #else
 267 #define D1 (BaseReg->rD1)
 268 #endif
 269
 270 #ifdef REG_D2
 271 GLOBAL_REG_DECL(StgDouble,D2,REG_D2)
 272 #else
 273 #define D2 (BaseReg->rD2)
 274 #endif
 275
 276 #ifdef REG_L1
 277 GLOBAL_REG_DECL(StgWord64,L1,REG_L1)
 278 #else
 279 #define L1 (BaseReg->rL1)
 280 #endif
 281
 282 /*
 283  * If BaseReg isn't mapped to a machine register, just use the global
 284  * address of the current register table (CurrentRegTable in
 285  * concurrent Haskell, MainRegTable otherwise).
 286  */
 287
 288 #ifdef REG_Base
 289 GLOBAL_REG_DECL(StgRegTable *,BaseReg,REG_Base)
 290 #else
 291 #ifdef SMP
 292 #error BaseReg must be in a register for SMP
 293 #endif
 294 #define BaseReg (&MainCapability.r)
 295 #endif
 296
 297 #ifdef REG_Sp
 298 GLOBAL_REG_DECL(P_,Sp,REG_Sp)
 299 #else
 300 #define Sp (BaseReg->rSp)
 301 #endif
 302
 303 #ifdef REG_SpLim
 304 GLOBAL_REG_DECL(P_,SpLim,REG_SpLim)
 305 #else
 306 #define SpLim (BaseReg->rSpLim)
 307 #endif
 308
 309 #ifdef REG_Hp
 310 GLOBAL_REG_DECL(P_,Hp,REG_Hp)
 311 #else
 312 #define Hp (BaseReg->rHp)
 313 #endif
 314
 315 #ifdef REG_HpLim
 316 GLOBAL_REG_DECL(P_,HpLim,REG_HpLim)
 317 #else
 318 #define HpLim (BaseReg->rHpLim)
 319 #endif
 320
 321 #ifdef REG_CurrentTSO
 322 GLOBAL_REG_DECL(StgTSO *,CurrentTSO,REG_CurrentTSO)
 323 #else
 324 #define CurrentTSO (BaseReg->rCurrentTSO)
 325 #endif
 326
 327 #ifdef REG_CurrentNursery
 328 GLOBAL_REG_DECL(bdescr *,CurrentNursery,REG_CurrentNursery)
 329 #else
 330 #define CurrentNursery (BaseReg->rCurrentNursery)
 331 #endif
 332
 333 #ifdef REG_HpAlloc
 334 GLOBAL_REG_DECL(bdescr *,HpAlloc,REG_HpAlloc)
 335 #else
 336 #define HpAlloc (BaseReg->rHpAlloc)
 337 #endif
 338
 339 #ifdef REG_SparkHd
 340 GLOBAL_REG_DECL(bdescr *,SparkHd,REG_SparkHd)
 341 #else
 342 #define SparkHd (BaseReg->rSparks.hd)
 343 #endif
 344
 345 #ifdef REG_SparkTl
 346 GLOBAL_REG_DECL(bdescr *,SparkTl,REG_SparkTl)
 347 #else
 348 #define SparkTl (BaseReg->rSparks.tl)
 349 #endif
 350
 351 #ifdef REG_SparkBase
 352 GLOBAL_REG_DECL(bdescr *,SparkBase,REG_SparkBase)
 353 #else
 354 #define SparkBase (BaseReg->rSparks.base)
 355 #endif
 356
 357 #ifdef REG_SparkLim
 358 GLOBAL_REG_DECL(bdescr *,SparkLim,REG_SparkLim)
 359 #else
 360 #define SparkLim (BaseReg->rSparks.lim)
 361 #endif
 362
 363 /* -----------------------------------------------------------------------------
 364    Get absolute function pointers from the register table, to save
 365    code space.  On x86,
 366
 367        jmp  *-12(%ebx)
 368
 369    is shorter than
 370
 371        jmp absolute_address
 372
 373    as long as the offset is within the range of a signed byte
 374    (-128..+127).  So we pick some common absolute_addresses and put
 375    them in the register table.  As a bonus, linking time should also
 376    be reduced.
 377
 378    Other possible candidates in order of importance:
 379
 380      stg_upd_frame_info
 381      stg_CAF_BLACKHOLE_info
 382      stg_IND_STATIC_info
 383
 384    anything else probably isn't worth the effort.
 385
 386    -------------------------------------------------------------------------- */
 387
 388
 389 #define FunReg ((StgFunTable *)((void *)BaseReg - sizeof(StgFunTable)))
 390
 391 #define stg_gc_enter_1     (FunReg->stgGCEnter1)
 392 #define stg_gc_fun         (FunReg->stgGCFun)
 393
 394 /* -----------------------------------------------------------------------------
 395    For any registers which are denoted "caller-saves" by the C calling
 396    convention, we have to emit code to save and restore them across C
 397    calls.
 398    -------------------------------------------------------------------------- */
 399
 400 #ifdef CALLER_SAVES_R1
 401 #define CALLER_SAVE_R1          SAVE_R1 = R1;
 402 #define CALLER_RESTORE_R1       R1 = SAVE_R1;
 403 #else
 404 #define CALLER_SAVE_R1          /* nothing */
 405 #define CALLER_RESTORE_R1       /* nothing */
 406 #endif
 407
 408 #ifdef CALLER_SAVES_R2
 409 #define CALLER_SAVE_R2          SAVE_R2 = R2;
 410 #define CALLER_RESTORE_R2       R2 = SAVE_R2;
 411 #else
 412 #define CALLER_SAVE_R2          /* nothing */
 413 #define CALLER_RESTORE_R2       /* nothing */
 414 #endif
 415
 416 #ifdef CALLER_SAVES_R3
 417 #define CALLER_SAVE_R3          SAVE_R3 = R3;
 418 #define CALLER_RESTORE_R3       R3 = SAVE_R3;
 419 #else
 420 #define CALLER_SAVE_R3          /* nothing */
 421 #define CALLER_RESTORE_R3       /* nothing */
 422 #endif
 423
 424 #ifdef CALLER_SAVES_R4
 425 #define CALLER_SAVE_R4          SAVE_R4 = R4;
 426 #define CALLER_RESTORE_R4       R4 = SAVE_R4;
 427 #else
 428 #define CALLER_SAVE_R4          /* nothing */
 429 #define CALLER_RESTORE_R4       /* nothing */
 430 #endif
 431
 432 #ifdef CALLER_SAVES_R5
 433 #define CALLER_SAVE_R5          SAVE_R5 = R5;
 434 #define CALLER_RESTORE_R5       R5 = SAVE_R5;
 435 #else
 436 #define CALLER_SAVE_R5          /* nothing */
 437 #define CALLER_RESTORE_R5       /* nothing */
 438 #endif
 439
 440 #ifdef CALLER_SAVES_R6
 441 #define CALLER_SAVE_R6          SAVE_R6 = R6;
 442 #define CALLER_RESTORE_R6       R6 = SAVE_R6;
 443 #else
 444 #define CALLER_SAVE_R6          /* nothing */
 445 #define CALLER_RESTORE_R6       /* nothing */
 446 #endif
 447
 448 #ifdef CALLER_SAVES_R7
 449 #define CALLER_SAVE_R7          SAVE_R7 = R7;
 450 #define CALLER_RESTORE_R7       R7 = SAVE_R7;
 451 #else
 452 #define CALLER_SAVE_R7          /* nothing */
 453 #define CALLER_RESTORE_R7       /* nothing */
 454 #endif
 455
 456 #ifdef CALLER_SAVES_R8
 457 #define CALLER_SAVE_R8          SAVE_R8 = R8;
 458 #define CALLER_RESTORE_R8       R8 = SAVE_R8;
 459 #else
 460 #define CALLER_SAVE_R8          /* nothing */
 461 #define CALLER_RESTORE_R8       /* nothing */
 462 #endif
 463
 464 #ifdef CALLER_SAVES_R9
 465 #define CALLER_SAVE_R9          SAVE_R9 = R9;
 466 #define CALLER_RESTORE_R9       R9 = SAVE_R9;
 467 #else
 468 #define CALLER_SAVE_R9          /* nothing */
 469 #define CALLER_RESTORE_R9       /* nothing */
 470 #endif
 471
 472 #ifdef CALLER_SAVES_R10
 473 #define CALLER_SAVE_R10         SAVE_R10 = R10;
 474 #define CALLER_RESTORE_R10      R10 = SAVE_R10;
 475 #else
 476 #define CALLER_SAVE_R10         /* nothing */
 477 #define CALLER_RESTORE_R10      /* nothing */
 478 #endif
 479
 480 #ifdef CALLER_SAVES_F1
 481 #define CALLER_SAVE_F1          SAVE_F1 = F1;
 482 #define CALLER_RESTORE_F1       F1 = SAVE_F1;
 483 #else
 484 #define CALLER_SAVE_F1          /* nothing */
 485 #define CALLER_RESTORE_F1       /* nothing */
 486 #endif
 487
 488 #ifdef CALLER_SAVES_F2
 489 #define CALLER_SAVE_F2          SAVE_F2 = F2;
 490 #define CALLER_RESTORE_F2       F2 = SAVE_F2;
 491 #else
 492 #define CALLER_SAVE_F2          /* nothing */
 493 #define CALLER_RESTORE_F2       /* nothing */
 494 #endif
 495
 496 #ifdef CALLER_SAVES_F3
 497 #define CALLER_SAVE_F3          SAVE_F3 = F3;
 498 #define CALLER_RESTORE_F3       F3 = SAVE_F3;
 499 #else
 500 #define CALLER_SAVE_F3          /* nothing */
 501 #define CALLER_RESTORE_F3       /* nothing */
 502 #endif
 503
 504 #ifdef CALLER_SAVES_F4
 505 #define CALLER_SAVE_F4          SAVE_F4 = F4;
 506 #define CALLER_RESTORE_F4       F4 = SAVE_F4;
 507 #else
 508 #define CALLER_SAVE_F4          /* nothing */
 509 #define CALLER_RESTORE_F4       /* nothing */
 510 #endif
 511
 512 #ifdef CALLER_SAVES_D1
 513 #define CALLER_SAVE_D1          SAVE_D1 = D1;
 514 #define CALLER_RESTORE_D1       D1 = SAVE_D1;
 515 #else
 516 #define CALLER_SAVE_D1          /* nothing */
 517 #define CALLER_RESTORE_D1       /* nothing */
 518 #endif
 519
 520 #ifdef CALLER_SAVES_D2
 521 #define CALLER_SAVE_D2          SAVE_D2 = D2;
 522 #define CALLER_RESTORE_D2       D2 = SAVE_D2;
 523 #else
 524 #define CALLER_SAVE_D2          /* nothing */
 525 #define CALLER_RESTORE_D2       /* nothing */
 526 #endif
 527
 528 #ifdef CALLER_SAVES_L1
 529 #define CALLER_SAVE_L1          SAVE_L1 = L1;
 530 #define CALLER_RESTORE_L1       L1 = SAVE_L1;
 531 #else
 532 #define CALLER_SAVE_L1          /* nothing */
 533 #define CALLER_RESTORE_L1       /* nothing */
 534 #endif
 535
 536 #ifdef CALLER_SAVES_Sp
 537 #define CALLER_SAVE_Sp          SAVE_Sp = Sp;
 538 #define CALLER_RESTORE_Sp       Sp = SAVE_Sp;
 539 #else
 540 #define CALLER_SAVE_Sp          /* nothing */
 541 #define CALLER_RESTORE_Sp       /* nothing */
 542 #endif
 543
 544 #ifdef CALLER_SAVES_SpLim
 545 #define CALLER_SAVE_SpLim       SAVE_SpLim = SpLim;
 546 #define CALLER_RESTORE_SpLim    SpLim = SAVE_SpLim;
 547 #else
 548 #define CALLER_SAVE_SpLim       /* nothing */
 549 #define CALLER_RESTORE_SpLim    /* nothing */
 550 #endif
 551
 552 #ifdef CALLER_SAVES_Hp
 553 #define CALLER_SAVE_Hp          SAVE_Hp = Hp;
 554 #define CALLER_RESTORE_Hp       Hp = SAVE_Hp;
 555 #else
 556 #define CALLER_SAVE_Hp          /* nothing */
 557 #define CALLER_RESTORE_Hp       /* nothing */
 558 #endif
 559
 560 #ifdef CALLER_SAVES_HpLim
 561 #define CALLER_SAVE_HpLim       SAVE_HpLim = HpLim;
 562 #define CALLER_RESTORE_HpLim    HpLim = SAVE_HpLim;
 563 #else
 564 #define CALLER_SAVE_HpLim       /* nothing */
 565 #define CALLER_RESTORE_HpLim    /* nothing */
 566 #endif
 567
 568 #ifdef CALLER_SAVES_Base
 569 #ifdef SMP
 570 #error "Can't have caller-saved BaseReg with SMP"
 571 #endif
 572 #define CALLER_SAVE_Base        /* nothing */
 573 #define CALLER_RESTORE_Base     BaseReg = &MainRegTable;
 574 #else
 575 #define CALLER_SAVE_Base        /* nothing */
 576 #define CALLER_RESTORE_Base     /* nothing */
 577 #endif
 578
 579 #ifdef CALLER_SAVES_CurrentTSO
 580 #define CALLER_SAVE_CurrentTSO          SAVE_CurrentTSO = CurrentTSO;
 581 #define CALLER_RESTORE_CurrentTSO       CurrentTSO = SAVE_CurrentTSO;
 582 #else
 583 #define CALLER_SAVE_CurrentTSO          /* nothing */
 584 #define CALLER_RESTORE_CurrentTSO       /* nothing */
 585 #endif
 586
 587 #ifdef CALLER_SAVES_CurrentNursery
 588 #define CALLER_SAVE_CurrentNursery      SAVE_CurrentNursery = CurrentNursery;
 589 #define CALLER_RESTORE_CurrentNursery   CurrentNursery = SAVE_CurrentNursery;
 590 #else
 591 #define CALLER_SAVE_CurrentNursery      /* nothing */
 592 #define CALLER_RESTORE_CurrentNursery   /* nothing */
 593 #endif
 594
 595 #ifdef CALLER_SAVES_HpAlloc
 596 #define CALLER_SAVE_HpAlloc             SAVE_HpAlloc = HpAlloc;
 597 #define CALLER_RESTORE_HpAlloc          HpAlloc = SAVE_HpAlloc;
 598 #else
 599 #define CALLER_SAVE_HpAlloc             /* nothing */
 600 #define CALLER_RESTORE_HpAlloc          /* nothing */
 601 #endif
 602
 603 #ifdef CALLER_SAVES_SparkHd
 604 #define CALLER_SAVE_SparkHd             SAVE_SparkHd = SparkHd;
 605 #define CALLER_RESTORE_SparkHd          SparkHd = SAVE_SparkHd;
 606 #else
 607 #define CALLER_SAVE_SparkHd             /* nothing */
 608 #define CALLER_RESTORE_SparkHd          /* nothing */
 609 #endif
 610
 611 #ifdef CALLER_SAVES_SparkTl
 612 #define CALLER_SAVE_SparkTl             SAVE_SparkTl = SparkTl;
 613 #define CALLER_RESTORE_SparkTl          SparkTl = SAVE_SparkTl;
 614 #else
 615 #define CALLER_SAVE_SparkTl             /* nothing */
 616 #define CALLER_RESTORE_SparkTl          /* nothing */
 617 #endif
 618
 619 #ifdef CALLER_SAVES_SparkBase
 620 #define CALLER_SAVE_SparkBase           SAVE_SparkBase = SparkBase;
 621 #define CALLER_RESTORE_SparkBase        SparkBase = SAVE_SparkBase;
 622 #else
 623 #define CALLER_SAVE_SparkBase           /* nothing */
 624 #define CALLER_RESTORE_SparkBase        /* nothing */
 625 #endif
 626
 627 #ifdef CALLER_SAVES_SparkLim
 628 #define CALLER_SAVE_SparkLim            SAVE_SparkLim = SparkLim;
 629 #define CALLER_RESTORE_SparkLim         SparkLim = SAVE_SparkLim;
 630 #else
 631 #define CALLER_SAVE_SparkLim            /* nothing */
 632 #define CALLER_RESTORE_SparkLim         /* nothing */
 633 #endif
 634
 635 #endif /* IN_STG_CODE */
 636
 637 /* ----------------------------------------------------------------------------
 638    Handy bunches of saves/restores
 639    ------------------------------------------------------------------------  */
 640
 641 #if IN_STG_CODE
 642
 643 #define CALLER_SAVE_USER                        \
 644   CALLER_SAVE_R1                                \
 645   CALLER_SAVE_R2                                \
 646   CALLER_SAVE_R3                                \
 647   CALLER_SAVE_R4                                \
 648   CALLER_SAVE_R5                                \
 649   CALLER_SAVE_R6                                \
 650   CALLER_SAVE_R7                                \
 651   CALLER_SAVE_R8                                \
 652   CALLER_SAVE_F1                                \
 653   CALLER_SAVE_F2                                \
 654   CALLER_SAVE_F3                                \
 655   CALLER_SAVE_F4                                \
 656   CALLER_SAVE_D1                                \
 657   CALLER_SAVE_D2                                \
 658   CALLER_SAVE_L1
 659
 660      /* Save Base last, since the others may
 661         be addressed relative to it */
 662 #define CALLER_SAVE_SYSTEM                      \
 663   CALLER_SAVE_Sp                                \
 664   CALLER_SAVE_SpLim                             \
 665   CALLER_SAVE_Hp                                \
 666   CALLER_SAVE_HpLim                             \
 667   CALLER_SAVE_CurrentTSO                        \
 668   CALLER_SAVE_CurrentNursery                    \
 669   CALLER_SAVE_SparkHd                           \
 670   CALLER_SAVE_SparkTl                           \
 671   CALLER_SAVE_SparkBase                         \
 672   CALLER_SAVE_SparkLim                          \
 673   CALLER_SAVE_Base
 674
 675 #define CALLER_RESTORE_USER                     \
 676   CALLER_RESTORE_R1                             \
 677   CALLER_RESTORE_R2                             \
 678   CALLER_RESTORE_R3                             \
 679   CALLER_RESTORE_R4                             \
 680   CALLER_RESTORE_R5                             \
 681   CALLER_RESTORE_R6                             \
 682   CALLER_RESTORE_R7                             \
 683   CALLER_RESTORE_R8                             \
 684   CALLER_RESTORE_F1                             \
 685   CALLER_RESTORE_F2                             \
 686   CALLER_RESTORE_F3                             \
 687   CALLER_RESTORE_F4                             \
 688   CALLER_RESTORE_D1                             \
 689   CALLER_RESTORE_D2                             \
 690   CALLER_RESTORE_L1
 691
 692      /* Restore Base first, since the others may
 693         be addressed relative to it */
 694 #define CALLER_RESTORE_SYSTEM                   \
 695   CALLER_RESTORE_Base                           \
 696   CALLER_RESTORE_Sp                             \
 697   CALLER_RESTORE_SpLim                          \
 698   CALLER_RESTORE_Hp                             \
 699   CALLER_RESTORE_HpLim                          \
 700   CALLER_RESTORE_CurrentTSO                     \
 701   CALLER_RESTORE_CurrentNursery                 \
 702   CALLER_RESTORE_SparkHd                        \
 703   CALLER_RESTORE_SparkTl                        \
 704   CALLER_RESTORE_SparkBase                      \
 705   CALLER_RESTORE_SparkLim
 706
 707 #else /* not IN_STG_CODE */
 708
 709 #define CALLER_SAVE_USER       /* nothing */
 710 #define CALLER_SAVE_SYSTEM     /* nothing */
 711 #define CALLER_RESTORE_USER    /* nothing */
 712 #define CALLER_RESTORE_SYSTEM  /* nothing */
 713
 714 #endif /* IN_STG_CODE */
 715
 716 #define CALLER_SAVE_ALL                         \
 717   CALLER_SAVE_SYSTEM                            \
 718   CALLER_SAVE_USER
 719
 720 #define CALLER_RESTORE_ALL                      \
 721   CALLER_RESTORE_SYSTEM                         \
 722   CALLER_RESTORE_USER
 723
 724 #endif /* REGS_H */
 725