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   StgFunPtr      stgGCEnter1;
  27   StgFunPtr      stgGCFun;
  28 } StgFunTable;
  29
  30 /*
  31  * Vanilla registers are given this union type, which is purely so
  32  * that we can cast the vanilla reg to a variety of types with the
  33  * minimum of syntax.  eg.  R1.w instead of (StgWord)R1.
  34  */
  35 typedef union {
  36     StgWord        w;
  37     StgAddr        a;
  38     StgChar        c;
  39     StgInt8        i8;
  40     StgFloat       f;
  41     StgInt         i;
  42     StgPtr         p;
  43     StgClosurePtr  cl;
  44     StgStackOffset offset;      /* unused? */
  45     StgByteArray   b;
  46     StgTSOPtr      t;
  47 } StgUnion;
  48
  49 // Urgh.. we don't know the size of an MP_INT here because we haven't
  50 // #included gmp.h.  We should really autoconf this, but GMP may not
  51 // be available at ./configure time if we're building it (GMP) locally.
  52 #define MP_INT_WORDS 3
  53
  54 /*
  55  * This is the table that holds shadow-locations for all the STG
  56  * registers.  The shadow locations are used when:
  57  *
  58  *     1) the particular register isn't mapped to a real machine
  59  *        register, probably because there's a shortage of real registers.
  60  *     2) caller-saves registers are saved across a CCall
  61  */
  62 typedef struct StgRegTable_ {
  63   StgUnion        rR1;
  64   StgUnion        rR2;
  65   StgUnion        rR3;
  66   StgUnion        rR4;
  67   StgUnion        rR5;
  68   StgUnion        rR6;
  69   StgUnion        rR7;
  70   StgUnion        rR8;
  71   StgUnion        rR9;          /* used occasionally by heap/stack checks */
  72   StgUnion        rR10;         /* used occasionally by heap/stack checks */
  73   StgFloat        rF1;
  74   StgFloat        rF2;
  75   StgFloat        rF3;
  76   StgFloat        rF4;
  77   StgDouble       rD1;
  78   StgDouble       rD2;
  79   StgWord64       rL1;
  80   StgPtr          rSp;
  81   StgPtr          rSpLim;
  82   StgPtr          rHp;
  83   StgPtr          rHpLim;
  84   struct StgTSO_ *rCurrentTSO;
  85   struct step_   *rNursery;
  86   struct bdescr_ *rCurrentNursery; /* Hp/HpLim point into this block */
  87   struct bdescr_ *rCurrentAlloc;   /* for allocation using allocate() */
  88   StgWord         rHpAlloc;     /* number of *bytes* being allocated in heap */
  89   // rmp_tmp1..rmp_result2 are only used in THREADED_RTS builds to
  90   // avoid per-thread temps in bss, but currently always incldue here
  91   // so we just run mkDerivedConstants once
  92   StgWord         rmp_tmp_w[MP_INT_WORDS];
  93   StgWord         rmp_tmp1[MP_INT_WORDS];
  94   StgWord         rmp_tmp2[MP_INT_WORDS];
  95   StgWord         rmp_result1[MP_INT_WORDS];
  96   StgWord         rmp_result2[MP_INT_WORDS];
  97   StgWord         rRet;  // holds the return code of the thread
  98 } StgRegTable;
  99
 100 #if IN_STG_CODE
 101
 102 /*
 103  * Registers Hp and HpLim are global across the entire system, and are
 104  * copied into the RegTable before executing a thread.
 105  *
 106  * Registers Sp and SpLim are saved in the TSO for the
 107  * thread, but are copied into the RegTable before executing a thread.
 108  *
 109  * All other registers are "general purpose", and are used for passing
 110  * arguments to functions, and returning values.  The code generator
 111  * knows how many of these are in real registers, and avoids
 112  * generating code that uses non-real registers.  General purpose
 113  * registers are never saved when returning to the scheduler, instead
 114  * we save whatever is live at the time on the stack, and restore it
 115  * later.  This should reduce the context switch time, amongst other
 116  * things.
 117  *
 118  * For argument passing, the stack will be used in preference to
 119  * pseudo-registers if the architecture has too few general purpose
 120  * registers.
 121  *
 122  * Some special RTS functions like newArray and the Integer primitives
 123  * expect their arguments to be in registers R1-Rn, so we use these
 124  * (pseudo-)registers in those cases.
 125  */
 126
 127 /*
 128  * Locations for saving per-thread registers.
 129  */
 130
 131 #define SAVE_Sp             (CurrentTSO->sp)
 132 #define SAVE_SpLim          (CurrentTSO->splim)
 133
 134 #define SAVE_Hp             (BaseReg->rHp)
 135 #define SAVE_HpLim          (BaseReg->rHpLim)
 136
 137 #define SAVE_CurrentTSO     (BaseReg->rCurrentTSO)
 138 #define SAVE_CurrentNursery (BaseReg->rCurrentNursery)
 139 #define SAVE_HpAlloc        (BaseReg->rHpAlloc)
 140
 141 /* We sometimes need to save registers across a C-call, eg. if they
 142  * are clobbered in the standard calling convention.  We define the
 143  * save locations for all registers in the register table.
 144  */
 145
 146 #define SAVE_R1             (BaseReg->rR1)
 147 #define SAVE_R2             (BaseReg->rR2)
 148 #define SAVE_R3             (BaseReg->rR3)
 149 #define SAVE_R4             (BaseReg->rR4)
 150 #define SAVE_R5             (BaseReg->rR5)
 151 #define SAVE_R6             (BaseReg->rR6)
 152 #define SAVE_R7             (BaseReg->rR7)
 153 #define SAVE_R8             (BaseReg->rR8)
 154
 155 #define SAVE_F1             (BaseReg->rF1)
 156 #define SAVE_F2             (BaseReg->rF2)
 157 #define SAVE_F3             (BaseReg->rF3)
 158 #define SAVE_F4             (BaseReg->rF4)
 159
 160 #define SAVE_D1             (BaseReg->rD1)
 161 #define SAVE_D2             (BaseReg->rD2)
 162
 163 #define SAVE_L1             (BaseReg->rL1)
 164
 165 /* -----------------------------------------------------------------------------
 166  * Emit the GCC-specific register declarations for each machine
 167  * register being used.  If any STG register isn't mapped to a machine
 168  * register, then map it to an offset from BaseReg.
 169  *
 170  * First, the general purpose registers.  The idea is, if a particular
 171  * general-purpose STG register can't be mapped to a real machine
 172  * register, it won't be used at all.  Instead, we'll use the stack.
 173  *
 174  * This is an improvement on the way things used to be done, when all
 175  * registers were mapped to locations in the register table, and stuff
 176  * was being shifted from the stack to the register table and back
 177  * again for no good reason (on register-poor architectures).
 178  */
 179
 180 /* define NO_REGS to omit register declarations - used in RTS C code
 181  * that needs all the STG definitions but not the global register
 182  * settings.
 183  */
 184 #define GLOBAL_REG_DECL(type,name,reg) register type name REG(reg);
 185
 186 #if defined(REG_R1) && !defined(NO_GLOBAL_REG_DECLS)
 187 GLOBAL_REG_DECL(StgUnion,R1,REG_R1)
 188 #else
 189 # define R1 (BaseReg->rR1)
 190 #endif
 191
 192 #if defined(REG_R2) && !defined(NO_GLOBAL_REG_DECLS)
 193 GLOBAL_REG_DECL(StgUnion,R2,REG_R2)
 194 #else
 195 # define R2 (BaseReg->rR2)
 196 #endif
 197
 198 #if defined(REG_R3) && !defined(NO_GLOBAL_REG_DECLS)
 199 GLOBAL_REG_DECL(StgUnion,R3,REG_R3)
 200 #else
 201 # define R3 (BaseReg->rR3)
 202 #endif
 203
 204 #if defined(REG_R4) && !defined(NO_GLOBAL_REG_DECLS)
 205 GLOBAL_REG_DECL(StgUnion,R4,REG_R4)
 206 #else
 207 # define R4 (BaseReg->rR4)
 208 #endif
 209
 210 #if defined(REG_R5) && !defined(NO_GLOBAL_REG_DECLS)
 211 GLOBAL_REG_DECL(StgUnion,R5,REG_R5)
 212 #else
 213 # define R5 (BaseReg->rR5)
 214 #endif
 215
 216 #if defined(REG_R6) && !defined(NO_GLOBAL_REG_DECLS)
 217 GLOBAL_REG_DECL(StgUnion,R6,REG_R6)
 218 #else
 219 # define R6 (BaseReg->rR6)
 220 #endif
 221
 222 #if defined(REG_R7) && !defined(NO_GLOBAL_REG_DECLS)
 223 GLOBAL_REG_DECL(StgUnion,R7,REG_R7)
 224 #else
 225 # define R7 (BaseReg->rR7)
 226 #endif
 227
 228 #if defined(REG_R8) && !defined(NO_GLOBAL_REG_DECLS)
 229 GLOBAL_REG_DECL(StgUnion,R8,REG_R8)
 230 #else
 231 # define R8 (BaseReg->rR8)
 232 #endif
 233
 234 #if defined(REG_R9) && !defined(NO_GLOBAL_REG_DECLS)
 235 GLOBAL_REG_DECL(StgUnion,R9,REG_R9)
 236 #else
 237 # define R9 (BaseReg->rR9)
 238 #endif
 239
 240 #if defined(REG_R10) && !defined(NO_GLOBAL_REG_DECLS)
 241 GLOBAL_REG_DECL(StgUnion,R10,REG_R10)
 242 #else
 243 # define R10 (BaseReg->rR10)
 244 #endif
 245
 246 #if defined(REG_F1) && !defined(NO_GLOBAL_REG_DECLS)
 247 GLOBAL_REG_DECL(StgFloat,F1,REG_F1)
 248 #else
 249 #define F1 (BaseReg->rF1)
 250 #endif
 251
 252 #if defined(REG_F2) && !defined(NO_GLOBAL_REG_DECLS)
 253 GLOBAL_REG_DECL(StgFloat,F2,REG_F2)
 254 #else
 255 #define F2 (BaseReg->rF2)
 256 #endif
 257
 258 #if defined(REG_F3) && !defined(NO_GLOBAL_REG_DECLS)
 259 GLOBAL_REG_DECL(StgFloat,F3,REG_F3)
 260 #else
 261 #define F3 (BaseReg->rF3)
 262 #endif
 263
 264 #if defined(REG_F4) && !defined(NO_GLOBAL_REG_DECLS)
 265 GLOBAL_REG_DECL(StgFloat,F4,REG_F4)
 266 #else
 267 #define F4 (BaseReg->rF4)
 268 #endif
 269
 270 #if defined(REG_D1) && !defined(NO_GLOBAL_REG_DECLS)
 271 GLOBAL_REG_DECL(StgDouble,D1,REG_D1)
 272 #else
 273 #define D1 (BaseReg->rD1)
 274 #endif
 275
 276 #if defined(REG_D2) && !defined(NO_GLOBAL_REG_DECLS)
 277 GLOBAL_REG_DECL(StgDouble,D2,REG_D2)
 278 #else
 279 #define D2 (BaseReg->rD2)
 280 #endif
 281
 282 #if defined(REG_L1) && !defined(NO_GLOBAL_REG_DECLS)
 283 GLOBAL_REG_DECL(StgWord64,L1,REG_L1)
 284 #else
 285 #define L1 (BaseReg->rL1)
 286 #endif
 287
 288 /*
 289  * If BaseReg isn't mapped to a machine register, just use the global
 290  * address of the current register table (CurrentRegTable in
 291  * concurrent Haskell, MainRegTable otherwise).
 292  */
 293
 294 /* A capability is a combination of a FunTable and a RegTable.  In STG
 295  * code, BaseReg normally points to the RegTable portion of this
 296  * structure, so that we can index both forwards and backwards to take
 297  * advantage of shorter instruction forms on some archs (eg. x86).
 298  * This is a cut-down version of the Capability structure; the full
 299  * version is defined in Capability.h.
 300  */
 301 struct PartCapability_ {
 302     StgFunTable f;
 303     StgRegTable r;
 304 };
 305
 306 /* No such thing as a MainCapability under THREADED_RTS - each thread must have
 307  * its own Capability.
 308  */
 309 #if IN_STG_CODE && !(defined(THREADED_RTS) && !defined(NOSMP))
 310 extern W_ MainCapability[];
 311 #endif
 312
 313 /*
 314  * Assigning to BaseReg (the ASSIGN_BaseReg macro): this happens on
 315  * return from a "safe" foreign call, when the thread might be running
 316  * on a new Capability.  Obviously if BaseReg is not a register, then
 317  * we are restricted to a single Capability (this invariant is enforced
 318  * in Capability.c:initCapabilities), and assigning to BaseReg can be omitted.
 319  */
 320
 321 #if defined(REG_Base) && !defined(NO_GLOBAL_REG_DECLS)
 322 GLOBAL_REG_DECL(StgRegTable *,BaseReg,REG_Base)
 323 #define ASSIGN_BaseReg(e) (BaseReg = (e))
 324 #else
 325 #if defined(THREADED_RTS) && !defined(NOSMP)
 326 #error BaseReg must be in a register for THREADED_RTS
 327 #endif
 328 #define BaseReg (&((struct PartCapability_ *)MainCapability)->r)
 329 #define ASSIGN_BaseReg(e) (e)
 330 #endif
 331
 332 #if defined(REG_Sp) && !defined(NO_GLOBAL_REG_DECLS)
 333 GLOBAL_REG_DECL(P_,Sp,REG_Sp)
 334 #else
 335 #define Sp (BaseReg->rSp)
 336 #endif
 337
 338 #if defined(REG_SpLim) && !defined(NO_GLOBAL_REG_DECLS)
 339 GLOBAL_REG_DECL(P_,SpLim,REG_SpLim)
 340 #else
 341 #define SpLim (BaseReg->rSpLim)
 342 #endif
 343
 344 #if defined(REG_Hp) && !defined(NO_GLOBAL_REG_DECLS)
 345 GLOBAL_REG_DECL(P_,Hp,REG_Hp)
 346 #else
 347 #define Hp (BaseReg->rHp)
 348 #endif
 349
 350 #if defined(REG_HpLim) && !defined(NO_GLOBAL_REG_DECLS)
 351 GLOBAL_REG_DECL(P_,HpLim,REG_HpLim)
 352 #else
 353 #define HpLim (BaseReg->rHpLim)
 354 #endif
 355
 356 #if defined(REG_CurrentTSO) && !defined(NO_GLOBAL_REG_DECLS)
 357 GLOBAL_REG_DECL(struct _StgTSO *,CurrentTSO,REG_CurrentTSO)
 358 #else
 359 #define CurrentTSO (BaseReg->rCurrentTSO)
 360 #endif
 361
 362 #if defined(REG_CurrentNursery) && !defined(NO_GLOBAL_REG_DECLS)
 363 GLOBAL_REG_DECL(bdescr *,CurrentNursery,REG_CurrentNursery)
 364 #else
 365 #define CurrentNursery (BaseReg->rCurrentNursery)
 366 #endif
 367
 368 #if defined(REG_HpAlloc) && !defined(NO_GLOBAL_REG_DECLS)
 369 GLOBAL_REG_DECL(bdescr *,HpAlloc,REG_HpAlloc)
 370 #else
 371 #define HpAlloc (BaseReg->rHpAlloc)
 372 #endif
 373
 374 /* -----------------------------------------------------------------------------
 375    Get absolute function pointers from the register table, to save
 376    code space.  On x86,
 377
 378        jmp  *-12(%ebx)
 379
 380    is shorter than
 381
 382        jmp absolute_address
 383
 384    as long as the offset is within the range of a signed byte
 385    (-128..+127).  So we pick some common absolute_addresses and put
 386    them in the register table.  As a bonus, linking time should also
 387    be reduced.
 388
 389    Other possible candidates in order of importance:
 390
 391      stg_upd_frame_info
 392      stg_CAF_BLACKHOLE_info
 393      stg_IND_STATIC_info
 394
 395    anything else probably isn't worth the effort.
 396
 397    -------------------------------------------------------------------------- */
 398
 399
 400 #define FunReg ((StgFunTable *)((void *)BaseReg - sizeof(StgFunTable)))
 401
 402 #define stg_gc_enter_1     (FunReg->stgGCEnter1)
 403 #define stg_gc_fun         (FunReg->stgGCFun)
 404
 405 /* -----------------------------------------------------------------------------
 406    For any registers which are denoted "caller-saves" by the C calling
 407    convention, we have to emit code to save and restore them across C
 408    calls.
 409    -------------------------------------------------------------------------- */
 410
 411 #ifdef CALLER_SAVES_R1
 412 #define CALLER_SAVE_R1          SAVE_R1 = R1;
 413 #define CALLER_RESTORE_R1       R1 = SAVE_R1;
 414 #else
 415 #define CALLER_SAVE_R1          /* nothing */
 416 #define CALLER_RESTORE_R1       /* nothing */
 417 #endif
 418
 419 #ifdef CALLER_SAVES_R2
 420 #define CALLER_SAVE_R2          SAVE_R2 = R2;
 421 #define CALLER_RESTORE_R2       R2 = SAVE_R2;
 422 #else
 423 #define CALLER_SAVE_R2          /* nothing */
 424 #define CALLER_RESTORE_R2       /* nothing */
 425 #endif
 426
 427 #ifdef CALLER_SAVES_R3
 428 #define CALLER_SAVE_R3          SAVE_R3 = R3;
 429 #define CALLER_RESTORE_R3       R3 = SAVE_R3;
 430 #else
 431 #define CALLER_SAVE_R3          /* nothing */
 432 #define CALLER_RESTORE_R3       /* nothing */
 433 #endif
 434
 435 #ifdef CALLER_SAVES_R4
 436 #define CALLER_SAVE_R4          SAVE_R4 = R4;
 437 #define CALLER_RESTORE_R4       R4 = SAVE_R4;
 438 #else
 439 #define CALLER_SAVE_R4          /* nothing */
 440 #define CALLER_RESTORE_R4       /* nothing */
 441 #endif
 442
 443 #ifdef CALLER_SAVES_R5
 444 #define CALLER_SAVE_R5          SAVE_R5 = R5;
 445 #define CALLER_RESTORE_R5       R5 = SAVE_R5;
 446 #else
 447 #define CALLER_SAVE_R5          /* nothing */
 448 #define CALLER_RESTORE_R5       /* nothing */
 449 #endif
 450
 451 #ifdef CALLER_SAVES_R6
 452 #define CALLER_SAVE_R6          SAVE_R6 = R6;
 453 #define CALLER_RESTORE_R6       R6 = SAVE_R6;
 454 #else
 455 #define CALLER_SAVE_R6          /* nothing */
 456 #define CALLER_RESTORE_R6       /* nothing */
 457 #endif
 458
 459 #ifdef CALLER_SAVES_R7
 460 #define CALLER_SAVE_R7          SAVE_R7 = R7;
 461 #define CALLER_RESTORE_R7       R7 = SAVE_R7;
 462 #else
 463 #define CALLER_SAVE_R7          /* nothing */
 464 #define CALLER_RESTORE_R7       /* nothing */
 465 #endif
 466
 467 #ifdef CALLER_SAVES_R8
 468 #define CALLER_SAVE_R8          SAVE_R8 = R8;
 469 #define CALLER_RESTORE_R8       R8 = SAVE_R8;
 470 #else
 471 #define CALLER_SAVE_R8          /* nothing */
 472 #define CALLER_RESTORE_R8       /* nothing */
 473 #endif
 474
 475 #ifdef CALLER_SAVES_R9
 476 #define CALLER_SAVE_R9          SAVE_R9 = R9;
 477 #define CALLER_RESTORE_R9       R9 = SAVE_R9;
 478 #else
 479 #define CALLER_SAVE_R9          /* nothing */
 480 #define CALLER_RESTORE_R9       /* nothing */
 481 #endif
 482
 483 #ifdef CALLER_SAVES_R10
 484 #define CALLER_SAVE_R10         SAVE_R10 = R10;
 485 #define CALLER_RESTORE_R10      R10 = SAVE_R10;
 486 #else
 487 #define CALLER_SAVE_R10         /* nothing */
 488 #define CALLER_RESTORE_R10      /* nothing */
 489 #endif
 490
 491 #ifdef CALLER_SAVES_F1
 492 #define CALLER_SAVE_F1          SAVE_F1 = F1;
 493 #define CALLER_RESTORE_F1       F1 = SAVE_F1;
 494 #else
 495 #define CALLER_SAVE_F1          /* nothing */
 496 #define CALLER_RESTORE_F1       /* nothing */
 497 #endif
 498
 499 #ifdef CALLER_SAVES_F2
 500 #define CALLER_SAVE_F2          SAVE_F2 = F2;
 501 #define CALLER_RESTORE_F2       F2 = SAVE_F2;
 502 #else
 503 #define CALLER_SAVE_F2          /* nothing */
 504 #define CALLER_RESTORE_F2       /* nothing */
 505 #endif
 506
 507 #ifdef CALLER_SAVES_F3
 508 #define CALLER_SAVE_F3          SAVE_F3 = F3;
 509 #define CALLER_RESTORE_F3       F3 = SAVE_F3;
 510 #else
 511 #define CALLER_SAVE_F3          /* nothing */
 512 #define CALLER_RESTORE_F3       /* nothing */
 513 #endif
 514
 515 #ifdef CALLER_SAVES_F4
 516 #define CALLER_SAVE_F4          SAVE_F4 = F4;
 517 #define CALLER_RESTORE_F4       F4 = SAVE_F4;
 518 #else
 519 #define CALLER_SAVE_F4          /* nothing */
 520 #define CALLER_RESTORE_F4       /* nothing */
 521 #endif
 522
 523 #ifdef CALLER_SAVES_D1
 524 #define CALLER_SAVE_D1          SAVE_D1 = D1;
 525 #define CALLER_RESTORE_D1       D1 = SAVE_D1;
 526 #else
 527 #define CALLER_SAVE_D1          /* nothing */
 528 #define CALLER_RESTORE_D1       /* nothing */
 529 #endif
 530
 531 #ifdef CALLER_SAVES_D2
 532 #define CALLER_SAVE_D2          SAVE_D2 = D2;
 533 #define CALLER_RESTORE_D2       D2 = SAVE_D2;
 534 #else
 535 #define CALLER_SAVE_D2          /* nothing */
 536 #define CALLER_RESTORE_D2       /* nothing */
 537 #endif
 538
 539 #ifdef CALLER_SAVES_L1
 540 #define CALLER_SAVE_L1          SAVE_L1 = L1;
 541 #define CALLER_RESTORE_L1       L1 = SAVE_L1;
 542 #else
 543 #define CALLER_SAVE_L1          /* nothing */
 544 #define CALLER_RESTORE_L1       /* nothing */
 545 #endif
 546
 547 #ifdef CALLER_SAVES_Sp
 548 #define CALLER_SAVE_Sp          SAVE_Sp = Sp;
 549 #define CALLER_RESTORE_Sp       Sp = SAVE_Sp;
 550 #else
 551 #define CALLER_SAVE_Sp          /* nothing */
 552 #define CALLER_RESTORE_Sp       /* nothing */
 553 #endif
 554
 555 #ifdef CALLER_SAVES_SpLim
 556 #define CALLER_SAVE_SpLim       SAVE_SpLim = SpLim;
 557 #define CALLER_RESTORE_SpLim    SpLim = SAVE_SpLim;
 558 #else
 559 #define CALLER_SAVE_SpLim       /* nothing */
 560 #define CALLER_RESTORE_SpLim    /* nothing */
 561 #endif
 562
 563 #ifdef CALLER_SAVES_Hp
 564 #define CALLER_SAVE_Hp          SAVE_Hp = Hp;
 565 #define CALLER_RESTORE_Hp       Hp = SAVE_Hp;
 566 #else
 567 #define CALLER_SAVE_Hp          /* nothing */
 568 #define CALLER_RESTORE_Hp       /* nothing */
 569 #endif
 570
 571 #ifdef CALLER_SAVES_HpLim
 572 #define CALLER_SAVE_HpLim       SAVE_HpLim = HpLim;
 573 #define CALLER_RESTORE_HpLim    HpLim = SAVE_HpLim;
 574 #else
 575 #define CALLER_SAVE_HpLim       /* nothing */
 576 #define CALLER_RESTORE_HpLim    /* nothing */
 577 #endif
 578
 579 #ifdef CALLER_SAVES_Base
 580 #ifdef THREADED_RTS
 581 #error "Can't have caller-saved BaseReg with THREADED_RTS"
 582 #endif
 583 #define CALLER_SAVE_Base        /* nothing */
 584 #define CALLER_RESTORE_Base     BaseReg = &MainRegTable;
 585 #else
 586 #define CALLER_SAVE_Base        /* nothing */
 587 #define CALLER_RESTORE_Base     /* nothing */
 588 #endif
 589
 590 #ifdef CALLER_SAVES_CurrentTSO
 591 #define CALLER_SAVE_CurrentTSO          SAVE_CurrentTSO = CurrentTSO;
 592 #define CALLER_RESTORE_CurrentTSO       CurrentTSO = SAVE_CurrentTSO;
 593 #else
 594 #define CALLER_SAVE_CurrentTSO          /* nothing */
 595 #define CALLER_RESTORE_CurrentTSO       /* nothing */
 596 #endif
 597
 598 #ifdef CALLER_SAVES_CurrentNursery
 599 #define CALLER_SAVE_CurrentNursery      SAVE_CurrentNursery = CurrentNursery;
 600 #define CALLER_RESTORE_CurrentNursery   CurrentNursery = SAVE_CurrentNursery;
 601 #else
 602 #define CALLER_SAVE_CurrentNursery      /* nothing */
 603 #define CALLER_RESTORE_CurrentNursery   /* nothing */
 604 #endif
 605
 606 #ifdef CALLER_SAVES_HpAlloc
 607 #define CALLER_SAVE_HpAlloc             SAVE_HpAlloc = HpAlloc;
 608 #define CALLER_RESTORE_HpAlloc          HpAlloc = SAVE_HpAlloc;
 609 #else
 610 #define CALLER_SAVE_HpAlloc             /* nothing */
 611 #define CALLER_RESTORE_HpAlloc          /* nothing */
 612 #endif
 613
 614 #endif /* IN_STG_CODE */
 615
 616 /* ----------------------------------------------------------------------------
 617    Handy bunches of saves/restores
 618    ------------------------------------------------------------------------  */
 619
 620 #if IN_STG_CODE
 621
 622 #define CALLER_SAVE_USER                        \
 623   CALLER_SAVE_R1                                \
 624   CALLER_SAVE_R2                                \
 625   CALLER_SAVE_R3                                \
 626   CALLER_SAVE_R4                                \
 627   CALLER_SAVE_R5                                \
 628   CALLER_SAVE_R6                                \
 629   CALLER_SAVE_R7                                \
 630   CALLER_SAVE_R8                                \
 631   CALLER_SAVE_F1                                \
 632   CALLER_SAVE_F2                                \
 633   CALLER_SAVE_F3                                \
 634   CALLER_SAVE_F4                                \
 635   CALLER_SAVE_D1                                \
 636   CALLER_SAVE_D2                                \
 637   CALLER_SAVE_L1
 638
 639      /* Save Base last, since the others may
 640         be addressed relative to it */
 641 #define CALLER_SAVE_SYSTEM                      \
 642   CALLER_SAVE_Sp                                \
 643   CALLER_SAVE_SpLim                             \
 644   CALLER_SAVE_Hp                                \
 645   CALLER_SAVE_HpLim                             \
 646   CALLER_SAVE_CurrentTSO                        \
 647   CALLER_SAVE_CurrentNursery                    \
 648   CALLER_SAVE_Base
 649
 650 #define CALLER_RESTORE_USER                     \
 651   CALLER_RESTORE_R1                             \
 652   CALLER_RESTORE_R2                             \
 653   CALLER_RESTORE_R3                             \
 654   CALLER_RESTORE_R4                             \
 655   CALLER_RESTORE_R5                             \
 656   CALLER_RESTORE_R6                             \
 657   CALLER_RESTORE_R7                             \
 658   CALLER_RESTORE_R8                             \
 659   CALLER_RESTORE_F1                             \
 660   CALLER_RESTORE_F2                             \
 661   CALLER_RESTORE_F3                             \
 662   CALLER_RESTORE_F4                             \
 663   CALLER_RESTORE_D1                             \
 664   CALLER_RESTORE_D2                             \
 665   CALLER_RESTORE_L1
 666
 667      /* Restore Base first, since the others may
 668         be addressed relative to it */
 669 #define CALLER_RESTORE_SYSTEM                   \
 670   CALLER_RESTORE_Base                           \
 671   CALLER_RESTORE_Sp                             \
 672   CALLER_RESTORE_SpLim                          \
 673   CALLER_RESTORE_Hp                             \
 674   CALLER_RESTORE_HpLim                          \
 675   CALLER_RESTORE_CurrentTSO                     \
 676   CALLER_RESTORE_CurrentNursery
 677
 678 #else /* not IN_STG_CODE */
 679
 680 #define CALLER_SAVE_USER       /* nothing */
 681 #define CALLER_SAVE_SYSTEM     /* nothing */
 682 #define CALLER_RESTORE_USER    /* nothing */
 683 #define CALLER_RESTORE_SYSTEM  /* nothing */
 684
 685 #endif /* IN_STG_CODE */
 686 #define CALLER_SAVE_ALL                         \
 687   CALLER_SAVE_SYSTEM                            \
 688   CALLER_SAVE_USER
 689
 690 #define CALLER_RESTORE_ALL                      \
 691   CALLER_RESTORE_SYSTEM                         \
 692   CALLER_RESTORE_USER
 693
 694 #endif /* REGS_H */