includes/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     StgInt8        i8;
  41     StgFloat       f;
  42     StgInt         i;
  43     StgPtr         p;
  44     StgClosurePtr  cl;
  45     StgStackOffset offset;      /* unused? */
  46     StgByteArray   b;
  47     StgTSOPtr      t;
  48 } StgUnion;
  49
  50 /*
  51  * This is the table that holds shadow-locations for all the STG
  52  * registers.  The shadow locations are used when:
  53  *
  54  *     1) the particular register isn't mapped to a real machine
  55  *        register, probably because there's a shortage of real registers.
  56  *     2) caller-saves registers are saved across a CCall
  57  */
  58 typedef struct StgRegTable_ {
  59   StgUnion        rR1;
  60   StgUnion        rR2;
  61   StgUnion        rR3;
  62   StgUnion        rR4;
  63   StgUnion        rR5;
  64   StgUnion        rR6;
  65   StgUnion        rR7;
  66   StgUnion        rR8;
  67   StgUnion        rR9;          /* used occasionally by heap/stack checks */
  68   StgUnion        rR10;         /* used occasionally by heap/stack checks */
  69   StgFloat        rF1;
  70   StgFloat        rF2;
  71   StgFloat        rF3;
  72   StgFloat        rF4;
  73   StgDouble       rD1;
  74   StgDouble       rD2;
  75   StgWord64       rL1;
  76   StgPtr          rSp;
  77   StgPtr          rSpLim;
  78   StgPtr          rHp;
  79   StgPtr          rHpLim;
  80   struct StgTSO_ *rCurrentTSO;
  81   struct step_   *rNursery;
  82   struct bdescr_ *rCurrentNursery; /* Hp/HpLim point into this block */
  83   struct bdescr_ *rCurrentAlloc;   /* for allocation using allocate() */
  84   StgWord         rHpAlloc;     /* number of *bytes* being allocated in heap */
  85   StgWord         rRet;  // holds the return code of the thread
  86 } StgRegTable;
  87
  88 #if IN_STG_CODE
  89
  90 /*
  91  * Registers Hp and HpLim are global across the entire system, and are
  92  * copied into the RegTable before executing a thread.
  93  *
  94  * Registers Sp and SpLim are saved in the TSO for the
  95  * thread, but are copied into the RegTable before executing a thread.
  96  *
  97  * All other registers are "general purpose", and are used for passing
  98  * arguments to functions, and returning values.  The code generator
  99  * knows how many of these are in real registers, and avoids
 100  * generating code that uses non-real registers.  General purpose
 101  * registers are never saved when returning to the scheduler, instead
 102  * we save whatever is live at the time on the stack, and restore it
 103  * later.  This should reduce the context switch time, amongst other
 104  * things.
 105  *
 106  * For argument passing, the stack will be used in preference to
 107  * pseudo-registers if the architecture has too few general purpose
 108  * registers.
 109  *
 110  * Some special RTS functions like newArray and the Integer primitives
 111  * expect their arguments to be in registers R1-Rn, so we use these
 112  * (pseudo-)registers in those cases.
 113  */
 114
 115 /*
 116  * Locations for saving per-thread registers.
 117  */
 118
 119 #define SAVE_Sp             (CurrentTSO->sp)
 120 #define SAVE_SpLim          (CurrentTSO->splim)
 121
 122 #define SAVE_Hp             (BaseReg->rHp)
 123
 124 #define SAVE_CurrentTSO     (BaseReg->rCurrentTSO)
 125 #define SAVE_CurrentNursery (BaseReg->rCurrentNursery)
 126 #define SAVE_HpAlloc        (BaseReg->rHpAlloc)
 127
 128 /* We sometimes need to save registers across a C-call, eg. if they
 129  * are clobbered in the standard calling convention.  We define the
 130  * save locations for all registers in the register table.
 131  */
 132
 133 #define SAVE_R1             (BaseReg->rR1)
 134 #define SAVE_R2             (BaseReg->rR2)
 135 #define SAVE_R3             (BaseReg->rR3)
 136 #define SAVE_R4             (BaseReg->rR4)
 137 #define SAVE_R5             (BaseReg->rR5)
 138 #define SAVE_R6             (BaseReg->rR6)
 139 #define SAVE_R7             (BaseReg->rR7)
 140 #define SAVE_R8             (BaseReg->rR8)
 141
 142 #define SAVE_F1             (BaseReg->rF1)
 143 #define SAVE_F2             (BaseReg->rF2)
 144 #define SAVE_F3             (BaseReg->rF3)
 145 #define SAVE_F4             (BaseReg->rF4)
 146
 147 #define SAVE_D1             (BaseReg->rD1)
 148 #define SAVE_D2             (BaseReg->rD2)
 149
 150 #define SAVE_L1             (BaseReg->rL1)
 151
 152 /* -----------------------------------------------------------------------------
 153  * Emit the GCC-specific register declarations for each machine
 154  * register being used.  If any STG register isn't mapped to a machine
 155  * register, then map it to an offset from BaseReg.
 156  *
 157  * First, the general purpose registers.  The idea is, if a particular
 158  * general-purpose STG register can't be mapped to a real machine
 159  * register, it won't be used at all.  Instead, we'll use the stack.
 160  *
 161  * This is an improvement on the way things used to be done, when all
 162  * registers were mapped to locations in the register table, and stuff
 163  * was being shifted from the stack to the register table and back
 164  * again for no good reason (on register-poor architectures).
 165  */
 166
 167 /* define NO_REGS to omit register declarations - used in RTS C code
 168  * that needs all the STG definitions but not the global register
 169  * settings.
 170  */
 171 #define GLOBAL_REG_DECL(type,name,reg) register type name REG(reg);
 172
 173 #if defined(REG_R1) && !defined(NO_GLOBAL_REG_DECLS)
 174 GLOBAL_REG_DECL(StgUnion,R1,REG_R1)
 175 #else
 176 # define R1 (BaseReg->rR1)
 177 #endif
 178
 179 #if defined(REG_R2) && !defined(NO_GLOBAL_REG_DECLS)
 180 GLOBAL_REG_DECL(StgUnion,R2,REG_R2)
 181 #else
 182 # define R2 (BaseReg->rR2)
 183 #endif
 184
 185 #if defined(REG_R3) && !defined(NO_GLOBAL_REG_DECLS)
 186 GLOBAL_REG_DECL(StgUnion,R3,REG_R3)
 187 #else
 188 # define R3 (BaseReg->rR3)
 189 #endif
 190
 191 #if defined(REG_R4) && !defined(NO_GLOBAL_REG_DECLS)
 192 GLOBAL_REG_DECL(StgUnion,R4,REG_R4)
 193 #else
 194 # define R4 (BaseReg->rR4)
 195 #endif
 196
 197 #if defined(REG_R5) && !defined(NO_GLOBAL_REG_DECLS)
 198 GLOBAL_REG_DECL(StgUnion,R5,REG_R5)
 199 #else
 200 # define R5 (BaseReg->rR5)
 201 #endif
 202
 203 #if defined(REG_R6) && !defined(NO_GLOBAL_REG_DECLS)
 204 GLOBAL_REG_DECL(StgUnion,R6,REG_R6)
 205 #else
 206 # define R6 (BaseReg->rR6)
 207 #endif
 208
 209 #if defined(REG_R7) && !defined(NO_GLOBAL_REG_DECLS)
 210 GLOBAL_REG_DECL(StgUnion,R7,REG_R7)
 211 #else
 212 # define R7 (BaseReg->rR7)
 213 #endif
 214
 215 #if defined(REG_R8) && !defined(NO_GLOBAL_REG_DECLS)
 216 GLOBAL_REG_DECL(StgUnion,R8,REG_R8)
 217 #else
 218 # define R8 (BaseReg->rR8)
 219 #endif
 220
 221 #if defined(REG_R9) && !defined(NO_GLOBAL_REG_DECLS)
 222 GLOBAL_REG_DECL(StgUnion,R9,REG_R9)
 223 #else
 224 # define R9 (BaseReg->rR9)
 225 #endif
 226
 227 #if defined(REG_R10) && !defined(NO_GLOBAL_REG_DECLS)
 228 GLOBAL_REG_DECL(StgUnion,R10,REG_R10)
 229 #else
 230 # define R10 (BaseReg->rR10)
 231 #endif
 232
 233 #if defined(REG_F1) && !defined(NO_GLOBAL_REG_DECLS)
 234 GLOBAL_REG_DECL(StgFloat,F1,REG_F1)
 235 #else
 236 #define F1 (BaseReg->rF1)
 237 #endif
 238
 239 #if defined(REG_F2) && !defined(NO_GLOBAL_REG_DECLS)
 240 GLOBAL_REG_DECL(StgFloat,F2,REG_F2)
 241 #else
 242 #define F2 (BaseReg->rF2)
 243 #endif
 244
 245 #if defined(REG_F3) && !defined(NO_GLOBAL_REG_DECLS)
 246 GLOBAL_REG_DECL(StgFloat,F3,REG_F3)
 247 #else
 248 #define F3 (BaseReg->rF3)
 249 #endif
 250
 251 #if defined(REG_F4) && !defined(NO_GLOBAL_REG_DECLS)
 252 GLOBAL_REG_DECL(StgFloat,F4,REG_F4)
 253 #else
 254 #define F4 (BaseReg->rF4)
 255 #endif
 256
 257 #if defined(REG_D1) && !defined(NO_GLOBAL_REG_DECLS)
 258 GLOBAL_REG_DECL(StgDouble,D1,REG_D1)
 259 #else
 260 #define D1 (BaseReg->rD1)
 261 #endif
 262
 263 #if defined(REG_D2) && !defined(NO_GLOBAL_REG_DECLS)
 264 GLOBAL_REG_DECL(StgDouble,D2,REG_D2)
 265 #else
 266 #define D2 (BaseReg->rD2)
 267 #endif
 268
 269 #if defined(REG_L1) && !defined(NO_GLOBAL_REG_DECLS)
 270 GLOBAL_REG_DECL(StgWord64,L1,REG_L1)
 271 #else
 272 #define L1 (BaseReg->rL1)
 273 #endif
 274
 275 /*
 276  * If BaseReg isn't mapped to a machine register, just use the global
 277  * address of the current register table (CurrentRegTable in
 278  * concurrent Haskell, MainRegTable otherwise).
 279  */
 280
 281 /* A capability is a combination of a FunTable and a RegTable.  In STG
 282  * code, BaseReg normally points to the RegTable portion of this
 283  * structure, so that we can index both forwards and backwards to take
 284  * advantage of shorter instruction forms on some archs (eg. x86).
 285  * This is a cut-down version of the Capability structure; the full
 286  * version is defined in Capability.h.
 287  */
 288 struct PartCapability_ {
 289     StgFunTable f;
 290     StgRegTable r;
 291 };
 292
 293 /* No such thing as a MainCapability under THREADED_RTS - each thread must have
 294  * its own Capability.
 295  */
 296 #if IN_STG_CODE && !(defined(THREADED_RTS) && !defined(NOSMP))
 297 extern W_ MainCapability[];
 298 #endif
 299
 300 /*
 301  * Assigning to BaseReg (the ASSIGN_BaseReg macro): this happens on
 302  * return from a "safe" foreign call, when the thread might be running
 303  * on a new Capability.  Obviously if BaseReg is not a register, then
 304  * we are restricted to a single Capability (this invariant is enforced
 305  * in Capability.c:initCapabilities), and assigning to BaseReg can be omitted.
 306  */
 307
 308 #if defined(REG_Base) && !defined(NO_GLOBAL_REG_DECLS)
 309 GLOBAL_REG_DECL(StgRegTable *,BaseReg,REG_Base)
 310 #define ASSIGN_BaseReg(e) (BaseReg = (e))
 311 #else
 312 #if defined(THREADED_RTS) && !defined(NOSMP)
 313 #error BaseReg must be in a register for THREADED_RTS
 314 #endif
 315 #define BaseReg (&((struct PartCapability_ *)MainCapability)->r)
 316 #define ASSIGN_BaseReg(e) (e)
 317 #endif
 318
 319 #if defined(REG_Sp) && !defined(NO_GLOBAL_REG_DECLS)
 320 GLOBAL_REG_DECL(P_,Sp,REG_Sp)
 321 #else
 322 #define Sp (BaseReg->rSp)
 323 #endif
 324
 325 #if defined(REG_SpLim) && !defined(NO_GLOBAL_REG_DECLS)
 326 GLOBAL_REG_DECL(P_,SpLim,REG_SpLim)
 327 #else
 328 #define SpLim (BaseReg->rSpLim)
 329 #endif
 330
 331 #if defined(REG_Hp) && !defined(NO_GLOBAL_REG_DECLS)
 332 GLOBAL_REG_DECL(P_,Hp,REG_Hp)
 333 #else
 334 #define Hp (BaseReg->rHp)
 335 #endif
 336
 337 #if defined(REG_HpLim) && !defined(NO_GLOBAL_REG_DECLS)
 338 #error HpLim cannot be in a register
 339 #else
 340 #define HpLim (BaseReg->rHpLim)
 341 #endif
 342
 343 #if defined(REG_CurrentTSO) && !defined(NO_GLOBAL_REG_DECLS)
 344 GLOBAL_REG_DECL(struct _StgTSO *,CurrentTSO,REG_CurrentTSO)
 345 #else
 346 #define CurrentTSO (BaseReg->rCurrentTSO)
 347 #endif
 348
 349 #if defined(REG_CurrentNursery) && !defined(NO_GLOBAL_REG_DECLS)
 350 GLOBAL_REG_DECL(bdescr *,CurrentNursery,REG_CurrentNursery)
 351 #else
 352 #define CurrentNursery (BaseReg->rCurrentNursery)
 353 #endif
 354
 355 #if defined(REG_HpAlloc) && !defined(NO_GLOBAL_REG_DECLS)
 356 GLOBAL_REG_DECL(bdescr *,HpAlloc,REG_HpAlloc)
 357 #else
 358 #define HpAlloc (BaseReg->rHpAlloc)
 359 #endif
 360
 361 /* -----------------------------------------------------------------------------
 362    Get absolute function pointers from the register table, to save
 363    code space.  On x86,
 364
 365        jmp  *-12(%ebx)
 366
 367    is shorter than
 368
 369        jmp absolute_address
 370
 371    as long as the offset is within the range of a signed byte
 372    (-128..+127).  So we pick some common absolute_addresses and put
 373    them in the register table.  As a bonus, linking time should also
 374    be reduced.
 375
 376    Other possible candidates in order of importance:
 377
 378      stg_upd_frame_info
 379      stg_CAF_BLACKHOLE_info
 380      stg_IND_STATIC_info
 381
 382    anything else probably isn't worth the effort.
 383
 384    -------------------------------------------------------------------------- */
 385
 386
 387 #define FunReg ((StgFunTable *)((void *)BaseReg - STG_FIELD_OFFSET(struct PartCapability_, r)))
 388
 389 #define stg_EAGER_BLACKHOLE_info  (FunReg->stgEagerBlackholeInfo)
 390 #define stg_gc_enter_1            (FunReg->stgGCEnter1)
 391 #define stg_gc_fun                (FunReg->stgGCFun)
 392
 393 /* -----------------------------------------------------------------------------
 394    For any registers which are denoted "caller-saves" by the C calling
 395    convention, we have to emit code to save and restore them across C
 396    calls.
 397    -------------------------------------------------------------------------- */
 398
 399 #ifdef CALLER_SAVES_R1
 400 #define CALLER_SAVE_R1          SAVE_R1 = R1;
 401 #define CALLER_RESTORE_R1       R1 = SAVE_R1;
 402 #else
 403 #define CALLER_SAVE_R1          /* nothing */
 404 #define CALLER_RESTORE_R1       /* nothing */
 405 #endif
 406
 407 #ifdef CALLER_SAVES_R2
 408 #define CALLER_SAVE_R2          SAVE_R2 = R2;
 409 #define CALLER_RESTORE_R2       R2 = SAVE_R2;
 410 #else
 411 #define CALLER_SAVE_R2          /* nothing */
 412 #define CALLER_RESTORE_R2       /* nothing */
 413 #endif
 414
 415 #ifdef CALLER_SAVES_R3
 416 #define CALLER_SAVE_R3          SAVE_R3 = R3;
 417 #define CALLER_RESTORE_R3       R3 = SAVE_R3;
 418 #else
 419 #define CALLER_SAVE_R3          /* nothing */
 420 #define CALLER_RESTORE_R3       /* nothing */
 421 #endif
 422
 423 #ifdef CALLER_SAVES_R4
 424 #define CALLER_SAVE_R4          SAVE_R4 = R4;
 425 #define CALLER_RESTORE_R4       R4 = SAVE_R4;
 426 #else
 427 #define CALLER_SAVE_R4          /* nothing */
 428 #define CALLER_RESTORE_R4       /* nothing */
 429 #endif
 430
 431 #ifdef CALLER_SAVES_R5
 432 #define CALLER_SAVE_R5          SAVE_R5 = R5;
 433 #define CALLER_RESTORE_R5       R5 = SAVE_R5;
 434 #else
 435 #define CALLER_SAVE_R5          /* nothing */
 436 #define CALLER_RESTORE_R5       /* nothing */
 437 #endif
 438
 439 #ifdef CALLER_SAVES_R6
 440 #define CALLER_SAVE_R6          SAVE_R6 = R6;
 441 #define CALLER_RESTORE_R6       R6 = SAVE_R6;
 442 #else
 443 #define CALLER_SAVE_R6          /* nothing */
 444 #define CALLER_RESTORE_R6       /* nothing */
 445 #endif
 446
 447 #ifdef CALLER_SAVES_R7
 448 #define CALLER_SAVE_R7          SAVE_R7 = R7;
 449 #define CALLER_RESTORE_R7       R7 = SAVE_R7;
 450 #else
 451 #define CALLER_SAVE_R7          /* nothing */
 452 #define CALLER_RESTORE_R7       /* nothing */
 453 #endif
 454
 455 #ifdef CALLER_SAVES_R8
 456 #define CALLER_SAVE_R8          SAVE_R8 = R8;
 457 #define CALLER_RESTORE_R8       R8 = SAVE_R8;
 458 #else
 459 #define CALLER_SAVE_R8          /* nothing */
 460 #define CALLER_RESTORE_R8       /* nothing */
 461 #endif
 462
 463 #ifdef CALLER_SAVES_R9
 464 #define CALLER_SAVE_R9          SAVE_R9 = R9;
 465 #define CALLER_RESTORE_R9       R9 = SAVE_R9;
 466 #else
 467 #define CALLER_SAVE_R9          /* nothing */
 468 #define CALLER_RESTORE_R9       /* nothing */
 469 #endif
 470
 471 #ifdef CALLER_SAVES_R10
 472 #define CALLER_SAVE_R10         SAVE_R10 = R10;
 473 #define CALLER_RESTORE_R10      R10 = SAVE_R10;
 474 #else
 475 #define CALLER_SAVE_R10         /* nothing */
 476 #define CALLER_RESTORE_R10      /* nothing */
 477 #endif
 478
 479 #ifdef CALLER_SAVES_F1
 480 #define CALLER_SAVE_F1          SAVE_F1 = F1;
 481 #define CALLER_RESTORE_F1       F1 = SAVE_F1;
 482 #else
 483 #define CALLER_SAVE_F1          /* nothing */
 484 #define CALLER_RESTORE_F1       /* nothing */
 485 #endif
 486
 487 #ifdef CALLER_SAVES_F2
 488 #define CALLER_SAVE_F2          SAVE_F2 = F2;
 489 #define CALLER_RESTORE_F2       F2 = SAVE_F2;
 490 #else
 491 #define CALLER_SAVE_F2          /* nothing */
 492 #define CALLER_RESTORE_F2       /* nothing */
 493 #endif
 494
 495 #ifdef CALLER_SAVES_F3
 496 #define CALLER_SAVE_F3          SAVE_F3 = F3;
 497 #define CALLER_RESTORE_F3       F3 = SAVE_F3;
 498 #else
 499 #define CALLER_SAVE_F3          /* nothing */
 500 #define CALLER_RESTORE_F3       /* nothing */
 501 #endif
 502
 503 #ifdef CALLER_SAVES_F4
 504 #define CALLER_SAVE_F4          SAVE_F4 = F4;
 505 #define CALLER_RESTORE_F4       F4 = SAVE_F4;
 506 #else
 507 #define CALLER_SAVE_F4          /* nothing */
 508 #define CALLER_RESTORE_F4       /* nothing */
 509 #endif
 510
 511 #ifdef CALLER_SAVES_D1
 512 #define CALLER_SAVE_D1          SAVE_D1 = D1;
 513 #define CALLER_RESTORE_D1       D1 = SAVE_D1;
 514 #else
 515 #define CALLER_SAVE_D1          /* nothing */
 516 #define CALLER_RESTORE_D1       /* nothing */
 517 #endif
 518
 519 #ifdef CALLER_SAVES_D2
 520 #define CALLER_SAVE_D2          SAVE_D2 = D2;
 521 #define CALLER_RESTORE_D2       D2 = SAVE_D2;
 522 #else
 523 #define CALLER_SAVE_D2          /* nothing */
 524 #define CALLER_RESTORE_D2       /* nothing */
 525 #endif
 526
 527 #ifdef CALLER_SAVES_L1
 528 #define CALLER_SAVE_L1          SAVE_L1 = L1;
 529 #define CALLER_RESTORE_L1       L1 = SAVE_L1;
 530 #else
 531 #define CALLER_SAVE_L1          /* nothing */
 532 #define CALLER_RESTORE_L1       /* nothing */
 533 #endif
 534
 535 #ifdef CALLER_SAVES_Sp
 536 #define CALLER_SAVE_Sp          SAVE_Sp = Sp;
 537 #define CALLER_RESTORE_Sp       Sp = SAVE_Sp;
 538 #else
 539 #define CALLER_SAVE_Sp          /* nothing */
 540 #define CALLER_RESTORE_Sp       /* nothing */
 541 #endif
 542
 543 #ifdef CALLER_SAVES_SpLim
 544 #define CALLER_SAVE_SpLim       SAVE_SpLim = SpLim;
 545 #define CALLER_RESTORE_SpLim    SpLim = SAVE_SpLim;
 546 #else
 547 #define CALLER_SAVE_SpLim       /* nothing */
 548 #define CALLER_RESTORE_SpLim    /* nothing */
 549 #endif
 550
 551 #ifdef CALLER_SAVES_Hp
 552 #define CALLER_SAVE_Hp          SAVE_Hp = Hp;
 553 #define CALLER_RESTORE_Hp       Hp = SAVE_Hp;
 554 #else
 555 #define CALLER_SAVE_Hp          /* nothing */
 556 #define CALLER_RESTORE_Hp       /* nothing */
 557 #endif
 558
 559 #ifdef CALLER_SAVES_Base
 560 #ifdef THREADED_RTS
 561 #error "Can't have caller-saved BaseReg with THREADED_RTS"
 562 #endif
 563 #define CALLER_SAVE_Base        /* nothing */
 564 #define CALLER_RESTORE_Base     BaseReg = &MainRegTable;
 565 #else
 566 #define CALLER_SAVE_Base        /* nothing */
 567 #define CALLER_RESTORE_Base     /* nothing */
 568 #endif
 569
 570 #ifdef CALLER_SAVES_CurrentTSO
 571 #define CALLER_SAVE_CurrentTSO          SAVE_CurrentTSO = CurrentTSO;
 572 #define CALLER_RESTORE_CurrentTSO       CurrentTSO = SAVE_CurrentTSO;
 573 #else
 574 #define CALLER_SAVE_CurrentTSO          /* nothing */
 575 #define CALLER_RESTORE_CurrentTSO       /* nothing */
 576 #endif
 577
 578 #ifdef CALLER_SAVES_CurrentNursery
 579 #define CALLER_SAVE_CurrentNursery      SAVE_CurrentNursery = CurrentNursery;
 580 #define CALLER_RESTORE_CurrentNursery   CurrentNursery = SAVE_CurrentNursery;
 581 #else
 582 #define CALLER_SAVE_CurrentNursery      /* nothing */
 583 #define CALLER_RESTORE_CurrentNursery   /* nothing */
 584 #endif
 585
 586 #ifdef CALLER_SAVES_HpAlloc
 587 #define CALLER_SAVE_HpAlloc             SAVE_HpAlloc = HpAlloc;
 588 #define CALLER_RESTORE_HpAlloc          HpAlloc = SAVE_HpAlloc;
 589 #else
 590 #define CALLER_SAVE_HpAlloc             /* nothing */
 591 #define CALLER_RESTORE_HpAlloc          /* nothing */
 592 #endif
 593
 594 #endif /* IN_STG_CODE */
 595
 596 /* ----------------------------------------------------------------------------
 597    Handy bunches of saves/restores
 598    ------------------------------------------------------------------------  */
 599
 600 #if IN_STG_CODE
 601
 602 #define CALLER_SAVE_USER                        \
 603   CALLER_SAVE_R1                                \
 604   CALLER_SAVE_R2                                \
 605   CALLER_SAVE_R3                                \
 606   CALLER_SAVE_R4                                \
 607   CALLER_SAVE_R5                                \
 608   CALLER_SAVE_R6                                \
 609   CALLER_SAVE_R7                                \
 610   CALLER_SAVE_R8                                \
 611   CALLER_SAVE_F1                                \
 612   CALLER_SAVE_F2                                \
 613   CALLER_SAVE_F3                                \
 614   CALLER_SAVE_F4                                \
 615   CALLER_SAVE_D1                                \
 616   CALLER_SAVE_D2                                \
 617   CALLER_SAVE_L1
 618
 619      /* Save Base last, since the others may
 620         be addressed relative to it */
 621 #define CALLER_SAVE_SYSTEM                      \
 622   CALLER_SAVE_Sp                                \
 623   CALLER_SAVE_SpLim                             \
 624   CALLER_SAVE_Hp                                \
 625   CALLER_SAVE_CurrentTSO                        \
 626   CALLER_SAVE_CurrentNursery                    \
 627   CALLER_SAVE_Base
 628
 629 #define CALLER_RESTORE_USER                     \
 630   CALLER_RESTORE_R1                             \
 631   CALLER_RESTORE_R2                             \
 632   CALLER_RESTORE_R3                             \
 633   CALLER_RESTORE_R4                             \
 634   CALLER_RESTORE_R5                             \
 635   CALLER_RESTORE_R6                             \
 636   CALLER_RESTORE_R7                             \
 637   CALLER_RESTORE_R8                             \
 638   CALLER_RESTORE_F1                             \
 639   CALLER_RESTORE_F2                             \
 640   CALLER_RESTORE_F3                             \
 641   CALLER_RESTORE_F4                             \
 642   CALLER_RESTORE_D1                             \
 643   CALLER_RESTORE_D2                             \
 644   CALLER_RESTORE_L1
 645
 646      /* Restore Base first, since the others may
 647         be addressed relative to it */
 648 #define CALLER_RESTORE_SYSTEM                   \
 649   CALLER_RESTORE_Base                           \
 650   CALLER_RESTORE_Sp                             \
 651   CALLER_RESTORE_SpLim                          \
 652   CALLER_RESTORE_Hp                             \
 653   CALLER_RESTORE_CurrentTSO                     \
 654   CALLER_RESTORE_CurrentNursery
 655
 656 #else /* not IN_STG_CODE */
 657
 658 #define CALLER_SAVE_USER       /* nothing */
 659 #define CALLER_SAVE_SYSTEM     /* nothing */
 660 #define CALLER_RESTORE_USER    /* nothing */
 661 #define CALLER_RESTORE_SYSTEM  /* nothing */
 662
 663 #endif /* IN_STG_CODE */
 664 #define CALLER_SAVE_ALL                         \
 665   CALLER_SAVE_SYSTEM                            \
 666   CALLER_SAVE_USER
 667
 668 #define CALLER_RESTORE_ALL                      \
 669   CALLER_RESTORE_SYSTEM                         \
 670   CALLER_RESTORE_USER
 671
 672 #endif /* REGS_H */