includes/stg/Regs.h

   1 /* -----------------------------------------------------------------------------
   2  *
   3  * (c) The GHC Team, 1998-2004
   4  *
   5  * Registers in the STG machine.
   6  *
   7  * The STG machine has a collection of "registers", each one of which
   8  * may or may not correspond to an actual machine register when
   9  * running code.
  10  *
  11  * The register set is backed by a table in memory (struct
  12  * StgRegTable).  If a particular STG register is not mapped to a
  13  * machine register, then the apprpriate slot in this table is used
  14  * instead.
  15  *
  16  * This table is itself pointed to by another register, BaseReg.  If
  17  * BaseReg is not in a machine register, then the register table is
  18  * used from an absolute location (MainCapability).
  19  *
  20  * ---------------------------------------------------------------------------*/
  21
  22 #ifndef REGS_H
  23 #define REGS_H
  24
  25 typedef struct {
  26   StgWord        stgEagerBlackholeInfo;
  27   StgFunPtr      stgGCEnter1;
  28   StgFunPtr      stgGCFun;
  29 } StgFunTable;
  30
  31 /*
  32  * Vanilla registers are given this union type, which is purely so
  33  * that we can cast the vanilla reg to a variety of types with the
  34  * minimum of syntax.  eg.  R1.w instead of (StgWord)R1.
  35  */
  36 typedef union {
  37     StgWord        w;
  38     StgAddr        a;
  39     StgChar        c;
  40     StgFloat       f;
  41     StgInt         i;
  42     StgPtr         p;
  43 } StgUnion;
  44
  45 /*
  46  * This is the table that holds shadow-locations for all the STG
  47  * registers.  The shadow locations are used when:
  48  *
  49  *     1) the particular register isn't mapped to a real machine
  50  *        register, probably because there's a shortage of real registers.
  51  *     2) caller-saves registers are saved across a CCall
  52  */
  53 typedef struct StgRegTable_ {
  54   StgUnion        rR1;
  55   StgUnion        rR2;
  56   StgUnion        rR3;
  57   StgUnion        rR4;
  58   StgUnion        rR5;
  59   StgUnion        rR6;
  60   StgUnion        rR7;
  61   StgUnion        rR8;
  62   StgUnion        rR9;          /* used occasionally by heap/stack checks */
  63   StgUnion        rR10;         /* used occasionally by heap/stack checks */
  64   StgFloat        rF1;
  65   StgFloat        rF2;
  66   StgFloat        rF3;
  67   StgFloat        rF4;
  68   StgDouble       rD1;
  69   StgDouble       rD2;
  70   StgWord64       rL1;
  71   StgPtr          rSp;
  72   StgPtr          rSpLim;
  73   StgPtr          rHp;
  74   StgPtr          rHpLim;
  75   struct StgTSO_ *rCurrentTSO;
  76   struct step_   *rNursery;
  77   struct bdescr_ *rCurrentNursery; /* Hp/HpLim point into this block */
  78   struct bdescr_ *rCurrentAlloc;   /* for allocation using allocate() */
  79   StgWord         rHpAlloc;     /* number of *bytes* being allocated in heap */
  80   StgWord         rRet;  // holds the return code of the thread
  81 } StgRegTable;
  82
  83 #if IN_STG_CODE
  84
  85 /*
  86  * Registers Hp and HpLim are global across the entire system, and are
  87  * copied into the RegTable before executing a thread.
  88  *
  89  * Registers Sp and SpLim are saved in the TSO for the
  90  * thread, but are copied into the RegTable before executing a thread.
  91  *
  92  * All other registers are "general purpose", and are used for passing
  93  * arguments to functions, and returning values.  The code generator
  94  * knows how many of these are in real registers, and avoids
  95  * generating code that uses non-real registers.  General purpose
  96  * registers are never saved when returning to the scheduler, instead
  97  * we save whatever is live at the time on the stack, and restore it
  98  * later.  This should reduce the context switch time, amongst other
  99  * things.
 100  *
 101  * For argument passing, the stack will be used in preference to
 102  * pseudo-registers if the architecture has too few general purpose
 103  * registers.
 104  *
 105  * Some special RTS functions like newArray and the Integer primitives
 106  * expect their arguments to be in registers R1-Rn, so we use these
 107  * (pseudo-)registers in those cases.
 108  */
 109
 110 /*
 111  * Locations for saving per-thread registers.
 112  */
 113
 114 #define SAVE_Sp             (CurrentTSO->sp)
 115 #define SAVE_SpLim          (CurrentTSO->splim)
 116
 117 #define SAVE_Hp             (BaseReg->rHp)
 118
 119 #define SAVE_CurrentTSO     (BaseReg->rCurrentTSO)
 120 #define SAVE_CurrentNursery (BaseReg->rCurrentNursery)
 121 #define SAVE_HpAlloc        (BaseReg->rHpAlloc)
 122
 123 /* We sometimes need to save registers across a C-call, eg. if they
 124  * are clobbered in the standard calling convention.  We define the
 125  * save locations for all registers in the register table.
 126  */
 127
 128 #define SAVE_R1             (BaseReg->rR1)
 129 #define SAVE_R2             (BaseReg->rR2)
 130 #define SAVE_R3             (BaseReg->rR3)
 131 #define SAVE_R4             (BaseReg->rR4)
 132 #define SAVE_R5             (BaseReg->rR5)
 133 #define SAVE_R6             (BaseReg->rR6)
 134 #define SAVE_R7             (BaseReg->rR7)
 135 #define SAVE_R8             (BaseReg->rR8)
 136
 137 #define SAVE_F1             (BaseReg->rF1)
 138 #define SAVE_F2             (BaseReg->rF2)
 139 #define SAVE_F3             (BaseReg->rF3)
 140 #define SAVE_F4             (BaseReg->rF4)
 141
 142 #define SAVE_D1             (BaseReg->rD1)
 143 #define SAVE_D2             (BaseReg->rD2)
 144
 145 #define SAVE_L1             (BaseReg->rL1)
 146
 147 /* -----------------------------------------------------------------------------
 148  * Emit the GCC-specific register declarations for each machine
 149  * register being used.  If any STG register isn't mapped to a machine
 150  * register, then map it to an offset from BaseReg.
 151  *
 152  * First, the general purpose registers.  The idea is, if a particular
 153  * general-purpose STG register can't be mapped to a real machine
 154  * register, it won't be used at all.  Instead, we'll use the stack.
 155  *
 156  * This is an improvement on the way things used to be done, when all
 157  * registers were mapped to locations in the register table, and stuff
 158  * was being shifted from the stack to the register table and back
 159  * again for no good reason (on register-poor architectures).
 160  */
 161
 162 /* define NO_REGS to omit register declarations - used in RTS C code
 163  * that needs all the STG definitions but not the global register
 164  * settings.
 165  */
 166 #define GLOBAL_REG_DECL(type,name,reg) register type name REG(reg);
 167
 168 #if defined(REG_R1) && !defined(NO_GLOBAL_REG_DECLS)
 169 GLOBAL_REG_DECL(StgUnion,R1,REG_R1)
 170 #else
 171 # define R1 (BaseReg->rR1)
 172 #endif
 173
 174 #if defined(REG_R2) && !defined(NO_GLOBAL_REG_DECLS)
 175 GLOBAL_REG_DECL(StgUnion,R2,REG_R2)
 176 #else
 177 # define R2 (BaseReg->rR2)
 178 #endif
 179
 180 #if defined(REG_R3) && !defined(NO_GLOBAL_REG_DECLS)
 181 GLOBAL_REG_DECL(StgUnion,R3,REG_R3)
 182 #else
 183 # define R3 (BaseReg->rR3)
 184 #endif
 185
 186 #if defined(REG_R4) && !defined(NO_GLOBAL_REG_DECLS)
 187 GLOBAL_REG_DECL(StgUnion,R4,REG_R4)
 188 #else
 189 # define R4 (BaseReg->rR4)
 190 #endif
 191
 192 #if defined(REG_R5) && !defined(NO_GLOBAL_REG_DECLS)
 193 GLOBAL_REG_DECL(StgUnion,R5,REG_R5)
 194 #else
 195 # define R5 (BaseReg->rR5)
 196 #endif
 197
 198 #if defined(REG_R6) && !defined(NO_GLOBAL_REG_DECLS)
 199 GLOBAL_REG_DECL(StgUnion,R6,REG_R6)
 200 #else
 201 # define R6 (BaseReg->rR6)
 202 #endif
 203
 204 #if defined(REG_R7) && !defined(NO_GLOBAL_REG_DECLS)
 205 GLOBAL_REG_DECL(StgUnion,R7,REG_R7)
 206 #else
 207 # define R7 (BaseReg->rR7)
 208 #endif
 209
 210 #if defined(REG_R8) && !defined(NO_GLOBAL_REG_DECLS)
 211 GLOBAL_REG_DECL(StgUnion,R8,REG_R8)
 212 #else
 213 # define R8 (BaseReg->rR8)
 214 #endif
 215
 216 #if defined(REG_R9) && !defined(NO_GLOBAL_REG_DECLS)
 217 GLOBAL_REG_DECL(StgUnion,R9,REG_R9)
 218 #else
 219 # define R9 (BaseReg->rR9)
 220 #endif
 221
 222 #if defined(REG_R10) && !defined(NO_GLOBAL_REG_DECLS)
 223 GLOBAL_REG_DECL(StgUnion,R10,REG_R10)
 224 #else
 225 # define R10 (BaseReg->rR10)
 226 #endif
 227
 228 #if defined(REG_F1) && !defined(NO_GLOBAL_REG_DECLS)
 229 GLOBAL_REG_DECL(StgFloat,F1,REG_F1)
 230 #else
 231 #define F1 (BaseReg->rF1)
 232 #endif
 233
 234 #if defined(REG_F2) && !defined(NO_GLOBAL_REG_DECLS)
 235 GLOBAL_REG_DECL(StgFloat,F2,REG_F2)
 236 #else
 237 #define F2 (BaseReg->rF2)
 238 #endif
 239
 240 #if defined(REG_F3) && !defined(NO_GLOBAL_REG_DECLS)
 241 GLOBAL_REG_DECL(StgFloat,F3,REG_F3)
 242 #else
 243 #define F3 (BaseReg->rF3)
 244 #endif
 245
 246 #if defined(REG_F4) && !defined(NO_GLOBAL_REG_DECLS)
 247 GLOBAL_REG_DECL(StgFloat,F4,REG_F4)
 248 #else
 249 #define F4 (BaseReg->rF4)
 250 #endif
 251
 252 #if defined(REG_D1) && !defined(NO_GLOBAL_REG_DECLS)
 253 GLOBAL_REG_DECL(StgDouble,D1,REG_D1)
 254 #else
 255 #define D1 (BaseReg->rD1)
 256 #endif
 257
 258 #if defined(REG_D2) && !defined(NO_GLOBAL_REG_DECLS)
 259 GLOBAL_REG_DECL(StgDouble,D2,REG_D2)
 260 #else
 261 #define D2 (BaseReg->rD2)
 262 #endif
 263
 264 #if defined(REG_L1) && !defined(NO_GLOBAL_REG_DECLS)
 265 GLOBAL_REG_DECL(StgWord64,L1,REG_L1)
 266 #else
 267 #define L1 (BaseReg->rL1)
 268 #endif
 269
 270 /*
 271  * If BaseReg isn't mapped to a machine register, just use the global
 272  * address of the current register table (CurrentRegTable in
 273  * concurrent Haskell, MainRegTable otherwise).
 274  */
 275
 276 /* A capability is a combination of a FunTable and a RegTable.  In STG
 277  * code, BaseReg normally points to the RegTable portion of this
 278  * structure, so that we can index both forwards and backwards to take
 279  * advantage of shorter instruction forms on some archs (eg. x86).
 280  * This is a cut-down version of the Capability structure; the full
 281  * version is defined in Capability.h.
 282  */
 283 struct PartCapability_ {
 284     StgFunTable f;
 285     StgRegTable r;
 286 };
 287
 288 /* No such thing as a MainCapability under THREADED_RTS - each thread must have
 289  * its own Capability.
 290  */
 291 #if IN_STG_CODE && !(defined(THREADED_RTS) && !defined(NOSMP))
 292 extern W_ MainCapability[];
 293 #endif
 294
 295 /*
 296  * Assigning to BaseReg (the ASSIGN_BaseReg macro): this happens on
 297  * return from a "safe" foreign call, when the thread might be running
 298  * on a new Capability.  Obviously if BaseReg is not a register, then
 299  * we are restricted to a single Capability (this invariant is enforced
 300  * in Capability.c:initCapabilities), and assigning to BaseReg can be omitted.
 301  */
 302
 303 #if defined(REG_Base) && !defined(NO_GLOBAL_REG_DECLS)
 304 GLOBAL_REG_DECL(StgRegTable *,BaseReg,REG_Base)
 305 #define ASSIGN_BaseReg(e) (BaseReg = (e))
 306 #else
 307 #if defined(THREADED_RTS) && !defined(NOSMP)
 308 #error BaseReg must be in a register for THREADED_RTS
 309 #endif
 310 #define BaseReg (&((struct PartCapability_ *)MainCapability)->r)
 311 #define ASSIGN_BaseReg(e) (e)
 312 #endif
 313
 314 #if defined(REG_Sp) && !defined(NO_GLOBAL_REG_DECLS)
 315 GLOBAL_REG_DECL(P_,Sp,REG_Sp)
 316 #else
 317 #define Sp (BaseReg->rSp)
 318 #endif
 319
 320 #if defined(REG_SpLim) && !defined(NO_GLOBAL_REG_DECLS)
 321 GLOBAL_REG_DECL(P_,SpLim,REG_SpLim)
 322 #else
 323 #define SpLim (BaseReg->rSpLim)
 324 #endif
 325
 326 #if defined(REG_Hp) && !defined(NO_GLOBAL_REG_DECLS)
 327 GLOBAL_REG_DECL(P_,Hp,REG_Hp)
 328 #else
 329 #define Hp (BaseReg->rHp)
 330 #endif
 331
 332 #if defined(REG_HpLim) && !defined(NO_GLOBAL_REG_DECLS)
 333 #error HpLim cannot be in a register
 334 #else
 335 #define HpLim (BaseReg->rHpLim)
 336 #endif
 337
 338 #if defined(REG_CurrentTSO) && !defined(NO_GLOBAL_REG_DECLS)
 339 GLOBAL_REG_DECL(struct _StgTSO *,CurrentTSO,REG_CurrentTSO)
 340 #else
 341 #define CurrentTSO (BaseReg->rCurrentTSO)
 342 #endif
 343
 344 #if defined(REG_CurrentNursery) && !defined(NO_GLOBAL_REG_DECLS)
 345 GLOBAL_REG_DECL(bdescr *,CurrentNursery,REG_CurrentNursery)
 346 #else
 347 #define CurrentNursery (BaseReg->rCurrentNursery)
 348 #endif
 349
 350 #if defined(REG_HpAlloc) && !defined(NO_GLOBAL_REG_DECLS)
 351 GLOBAL_REG_DECL(bdescr *,HpAlloc,REG_HpAlloc)
 352 #else
 353 #define HpAlloc (BaseReg->rHpAlloc)
 354 #endif
 355
 356 /* -----------------------------------------------------------------------------
 357    Get absolute function pointers from the register table, to save
 358    code space.  On x86,
 359
 360        jmp  *-12(%ebx)
 361
 362    is shorter than
 363
 364        jmp absolute_address
 365
 366    as long as the offset is within the range of a signed byte
 367    (-128..+127).  So we pick some common absolute_addresses and put
 368    them in the register table.  As a bonus, linking time should also
 369    be reduced.
 370
 371    Other possible candidates in order of importance:
 372
 373      stg_upd_frame_info
 374      stg_CAF_BLACKHOLE_info
 375      stg_IND_STATIC_info
 376
 377    anything else probably isn't worth the effort.
 378
 379    -------------------------------------------------------------------------- */
 380
 381
 382 #define FunReg ((StgFunTable *)((void *)BaseReg - STG_FIELD_OFFSET(struct PartCapability_, r)))
 383
 384 #define stg_EAGER_BLACKHOLE_info  (FunReg->stgEagerBlackholeInfo)
 385 #define stg_gc_enter_1            (FunReg->stgGCEnter1)
 386 #define stg_gc_fun                (FunReg->stgGCFun)
 387
 388 /* -----------------------------------------------------------------------------
 389    For any registers which are denoted "caller-saves" by the C calling
 390    convention, we have to emit code to save and restore them across C
 391    calls.
 392    -------------------------------------------------------------------------- */
 393
 394 #ifdef CALLER_SAVES_R1
 395 #define CALLER_SAVE_R1          SAVE_R1 = R1;
 396 #define CALLER_RESTORE_R1       R1 = SAVE_R1;
 397 #else
 398 #define CALLER_SAVE_R1          /* nothing */
 399 #define CALLER_RESTORE_R1       /* nothing */
 400 #endif
 401
 402 #ifdef CALLER_SAVES_R2
 403 #define CALLER_SAVE_R2          SAVE_R2 = R2;
 404 #define CALLER_RESTORE_R2       R2 = SAVE_R2;
 405 #else
 406 #define CALLER_SAVE_R2          /* nothing */
 407 #define CALLER_RESTORE_R2       /* nothing */
 408 #endif
 409
 410 #ifdef CALLER_SAVES_R3
 411 #define CALLER_SAVE_R3          SAVE_R3 = R3;
 412 #define CALLER_RESTORE_R3       R3 = SAVE_R3;
 413 #else
 414 #define CALLER_SAVE_R3          /* nothing */
 415 #define CALLER_RESTORE_R3       /* nothing */
 416 #endif
 417
 418 #ifdef CALLER_SAVES_R4
 419 #define CALLER_SAVE_R4          SAVE_R4 = R4;
 420 #define CALLER_RESTORE_R4       R4 = SAVE_R4;
 421 #else
 422 #define CALLER_SAVE_R4          /* nothing */
 423 #define CALLER_RESTORE_R4       /* nothing */
 424 #endif
 425
 426 #ifdef CALLER_SAVES_R5
 427 #define CALLER_SAVE_R5          SAVE_R5 = R5;
 428 #define CALLER_RESTORE_R5       R5 = SAVE_R5;
 429 #else
 430 #define CALLER_SAVE_R5          /* nothing */
 431 #define CALLER_RESTORE_R5       /* nothing */
 432 #endif
 433
 434 #ifdef CALLER_SAVES_R6
 435 #define CALLER_SAVE_R6          SAVE_R6 = R6;
 436 #define CALLER_RESTORE_R6       R6 = SAVE_R6;
 437 #else
 438 #define CALLER_SAVE_R6          /* nothing */
 439 #define CALLER_RESTORE_R6       /* nothing */
 440 #endif
 441
 442 #ifdef CALLER_SAVES_R7
 443 #define CALLER_SAVE_R7          SAVE_R7 = R7;
 444 #define CALLER_RESTORE_R7       R7 = SAVE_R7;
 445 #else
 446 #define CALLER_SAVE_R7          /* nothing */
 447 #define CALLER_RESTORE_R7       /* nothing */
 448 #endif
 449
 450 #ifdef CALLER_SAVES_R8
 451 #define CALLER_SAVE_R8          SAVE_R8 = R8;
 452 #define CALLER_RESTORE_R8       R8 = SAVE_R8;
 453 #else
 454 #define CALLER_SAVE_R8          /* nothing */
 455 #define CALLER_RESTORE_R8       /* nothing */
 456 #endif
 457
 458 #ifdef CALLER_SAVES_R9
 459 #define CALLER_SAVE_R9          SAVE_R9 = R9;
 460 #define CALLER_RESTORE_R9       R9 = SAVE_R9;
 461 #else
 462 #define CALLER_SAVE_R9          /* nothing */
 463 #define CALLER_RESTORE_R9       /* nothing */
 464 #endif
 465
 466 #ifdef CALLER_SAVES_R10
 467 #define CALLER_SAVE_R10         SAVE_R10 = R10;
 468 #define CALLER_RESTORE_R10      R10 = SAVE_R10;
 469 #else
 470 #define CALLER_SAVE_R10         /* nothing */
 471 #define CALLER_RESTORE_R10      /* nothing */
 472 #endif
 473
 474 #ifdef CALLER_SAVES_F1
 475 #define CALLER_SAVE_F1          SAVE_F1 = F1;
 476 #define CALLER_RESTORE_F1       F1 = SAVE_F1;
 477 #else
 478 #define CALLER_SAVE_F1          /* nothing */
 479 #define CALLER_RESTORE_F1       /* nothing */
 480 #endif
 481
 482 #ifdef CALLER_SAVES_F2
 483 #define CALLER_SAVE_F2          SAVE_F2 = F2;
 484 #define CALLER_RESTORE_F2       F2 = SAVE_F2;
 485 #else
 486 #define CALLER_SAVE_F2          /* nothing */
 487 #define CALLER_RESTORE_F2       /* nothing */
 488 #endif
 489
 490 #ifdef CALLER_SAVES_F3
 491 #define CALLER_SAVE_F3          SAVE_F3 = F3;
 492 #define CALLER_RESTORE_F3       F3 = SAVE_F3;
 493 #else
 494 #define CALLER_SAVE_F3          /* nothing */
 495 #define CALLER_RESTORE_F3       /* nothing */
 496 #endif
 497
 498 #ifdef CALLER_SAVES_F4
 499 #define CALLER_SAVE_F4          SAVE_F4 = F4;
 500 #define CALLER_RESTORE_F4       F4 = SAVE_F4;
 501 #else
 502 #define CALLER_SAVE_F4          /* nothing */
 503 #define CALLER_RESTORE_F4       /* nothing */
 504 #endif
 505
 506 #ifdef CALLER_SAVES_D1
 507 #define CALLER_SAVE_D1          SAVE_D1 = D1;
 508 #define CALLER_RESTORE_D1       D1 = SAVE_D1;
 509 #else
 510 #define CALLER_SAVE_D1          /* nothing */
 511 #define CALLER_RESTORE_D1       /* nothing */
 512 #endif
 513
 514 #ifdef CALLER_SAVES_D2
 515 #define CALLER_SAVE_D2          SAVE_D2 = D2;
 516 #define CALLER_RESTORE_D2       D2 = SAVE_D2;
 517 #else
 518 #define CALLER_SAVE_D2          /* nothing */
 519 #define CALLER_RESTORE_D2       /* nothing */
 520 #endif
 521
 522 #ifdef CALLER_SAVES_L1
 523 #define CALLER_SAVE_L1          SAVE_L1 = L1;
 524 #define CALLER_RESTORE_L1       L1 = SAVE_L1;
 525 #else
 526 #define CALLER_SAVE_L1          /* nothing */
 527 #define CALLER_RESTORE_L1       /* nothing */
 528 #endif
 529
 530 #ifdef CALLER_SAVES_Sp
 531 #define CALLER_SAVE_Sp          SAVE_Sp = Sp;
 532 #define CALLER_RESTORE_Sp       Sp = SAVE_Sp;
 533 #else
 534 #define CALLER_SAVE_Sp          /* nothing */
 535 #define CALLER_RESTORE_Sp       /* nothing */
 536 #endif
 537
 538 #ifdef CALLER_SAVES_SpLim
 539 #define CALLER_SAVE_SpLim       SAVE_SpLim = SpLim;
 540 #define CALLER_RESTORE_SpLim    SpLim = SAVE_SpLim;
 541 #else
 542 #define CALLER_SAVE_SpLim       /* nothing */
 543 #define CALLER_RESTORE_SpLim    /* nothing */
 544 #endif
 545
 546 #ifdef CALLER_SAVES_Hp
 547 #define CALLER_SAVE_Hp          SAVE_Hp = Hp;
 548 #define CALLER_RESTORE_Hp       Hp = SAVE_Hp;
 549 #else
 550 #define CALLER_SAVE_Hp          /* nothing */
 551 #define CALLER_RESTORE_Hp       /* nothing */
 552 #endif
 553
 554 #ifdef CALLER_SAVES_Base
 555 #ifdef THREADED_RTS
 556 #error "Can't have caller-saved BaseReg with THREADED_RTS"
 557 #endif
 558 #define CALLER_SAVE_Base        /* nothing */
 559 #define CALLER_RESTORE_Base     BaseReg = &MainRegTable;
 560 #else
 561 #define CALLER_SAVE_Base        /* nothing */
 562 #define CALLER_RESTORE_Base     /* nothing */
 563 #endif
 564
 565 #ifdef CALLER_SAVES_CurrentTSO
 566 #define CALLER_SAVE_CurrentTSO          SAVE_CurrentTSO = CurrentTSO;
 567 #define CALLER_RESTORE_CurrentTSO       CurrentTSO = SAVE_CurrentTSO;
 568 #else
 569 #define CALLER_SAVE_CurrentTSO          /* nothing */
 570 #define CALLER_RESTORE_CurrentTSO       /* nothing */
 571 #endif
 572
 573 #ifdef CALLER_SAVES_CurrentNursery
 574 #define CALLER_SAVE_CurrentNursery      SAVE_CurrentNursery = CurrentNursery;
 575 #define CALLER_RESTORE_CurrentNursery   CurrentNursery = SAVE_CurrentNursery;
 576 #else
 577 #define CALLER_SAVE_CurrentNursery      /* nothing */
 578 #define CALLER_RESTORE_CurrentNursery   /* nothing */
 579 #endif
 580
 581 #ifdef CALLER_SAVES_HpAlloc
 582 #define CALLER_SAVE_HpAlloc             SAVE_HpAlloc = HpAlloc;
 583 #define CALLER_RESTORE_HpAlloc          HpAlloc = SAVE_HpAlloc;
 584 #else
 585 #define CALLER_SAVE_HpAlloc             /* nothing */
 586 #define CALLER_RESTORE_HpAlloc          /* nothing */
 587 #endif
 588
 589 #endif /* IN_STG_CODE */
 590
 591 /* ----------------------------------------------------------------------------
 592    Handy bunches of saves/restores
 593    ------------------------------------------------------------------------  */
 594
 595 #if IN_STG_CODE
 596
 597 #define CALLER_SAVE_USER                        \
 598   CALLER_SAVE_R1                                \
 599   CALLER_SAVE_R2                                \
 600   CALLER_SAVE_R3                                \
 601   CALLER_SAVE_R4                                \
 602   CALLER_SAVE_R5                                \
 603   CALLER_SAVE_R6                                \
 604   CALLER_SAVE_R7                                \
 605   CALLER_SAVE_R8                                \
 606   CALLER_SAVE_F1                                \
 607   CALLER_SAVE_F2                                \
 608   CALLER_SAVE_F3                                \
 609   CALLER_SAVE_F4                                \
 610   CALLER_SAVE_D1                                \
 611   CALLER_SAVE_D2                                \
 612   CALLER_SAVE_L1
 613
 614      /* Save Base last, since the others may
 615         be addressed relative to it */
 616 #define CALLER_SAVE_SYSTEM                      \
 617   CALLER_SAVE_Sp                                \
 618   CALLER_SAVE_SpLim                             \
 619   CALLER_SAVE_Hp                                \
 620   CALLER_SAVE_CurrentTSO                        \
 621   CALLER_SAVE_CurrentNursery                    \
 622   CALLER_SAVE_Base
 623
 624 #define CALLER_RESTORE_USER                     \
 625   CALLER_RESTORE_R1                             \
 626   CALLER_RESTORE_R2                             \
 627   CALLER_RESTORE_R3                             \
 628   CALLER_RESTORE_R4                             \
 629   CALLER_RESTORE_R5                             \
 630   CALLER_RESTORE_R6                             \
 631   CALLER_RESTORE_R7                             \
 632   CALLER_RESTORE_R8                             \
 633   CALLER_RESTORE_F1                             \
 634   CALLER_RESTORE_F2                             \
 635   CALLER_RESTORE_F3                             \
 636   CALLER_RESTORE_F4                             \
 637   CALLER_RESTORE_D1                             \
 638   CALLER_RESTORE_D2                             \
 639   CALLER_RESTORE_L1
 640
 641      /* Restore Base first, since the others may
 642         be addressed relative to it */
 643 #define CALLER_RESTORE_SYSTEM                   \
 644   CALLER_RESTORE_Base                           \
 645   CALLER_RESTORE_Sp                             \
 646   CALLER_RESTORE_SpLim                          \
 647   CALLER_RESTORE_Hp                             \
 648   CALLER_RESTORE_CurrentTSO                     \
 649   CALLER_RESTORE_CurrentNursery
 650
 651 #else /* not IN_STG_CODE */
 652
 653 #define CALLER_SAVE_USER       /* nothing */
 654 #define CALLER_SAVE_SYSTEM     /* nothing */
 655 #define CALLER_RESTORE_USER    /* nothing */
 656 #define CALLER_RESTORE_SYSTEM  /* nothing */
 657
 658 #endif /* IN_STG_CODE */
 659 #define CALLER_SAVE_ALL                         \
 660   CALLER_SAVE_SYSTEM                            \
 661   CALLER_SAVE_USER
 662
 663 #define CALLER_RESTORE_ALL                      \
 664   CALLER_RESTORE_SYSTEM                         \
 665   CALLER_RESTORE_USER
 666
 667 #endif /* REGS_H */