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 #include "gmp.h" // Needs MP_INT definition
  26
  27 /*
  28  * Spark pools: used to store pending sparks
  29  *  (THREADED_RTS & PARALLEL_HASKELL only)
  30  * This is a circular buffer.  Invariants:
  31  *    - base <= hd < lim
  32  *    - base <= tl < lim
  33  *    - if hd==tl, then the pool is empty.
  34  *    - if hd == tl+1, then the pool is full.
  35  * Adding to the pool is done by assigning to *tl++ (wrapping round as
  36  * necessary).  When adding to a full pool, we have the option of
  37  * throwing away either the oldest (hd++) or the most recent (tl--) entry.
  38  */
  39 typedef struct StgSparkPool_ {
  40   StgClosure **base;
  41   StgClosure **lim;
  42   StgClosure **hd;
  43   StgClosure **tl;
  44 } StgSparkPool;
  45
  46 #define ASSERT_SPARK_POOL_INVARIANTS(p)         \
  47   ASSERT((p)->base <= (p)->hd);                 \
  48   ASSERT((p)->hd < (p)->lim);                   \
  49   ASSERT((p)->base <= (p)->tl);                 \
  50   ASSERT((p)->tl < (p)->lim);
  51
  52 typedef struct {
  53   StgFunPtr      stgGCEnter1;
  54   StgFunPtr      stgGCFun;
  55 } StgFunTable;
  56
  57 /*
  58  * Vanilla registers are given this union type, which is purely so
  59  * that we can cast the vanilla reg to a variety of types with the
  60  * minimum of syntax.  eg.  R1.w instead of (StgWord)R1.
  61  */
  62 typedef union {
  63     StgWord        w;
  64     StgAddr        a;
  65     StgChar        c;
  66     StgInt8        i8;
  67     StgFloat       f;
  68     StgInt         i;
  69     StgPtr         p;
  70     StgClosurePtr  cl;
  71     StgStackOffset offset;      /* unused? */
  72     StgByteArray   b;
  73     StgTSOPtr      t;
  74 } StgUnion;
  75
  76 /*
  77  * This is the table that holds shadow-locations for all the STG
  78  * registers.  The shadow locations are used when:
  79  *
  80  *     1) the particular register isn't mapped to a real machine
  81  *        register, probably because there's a shortage of real registers.
  82  *     2) caller-saves registers are saved across a CCall
  83  */
  84 typedef struct StgRegTable_ {
  85   StgUnion        rR1;
  86   StgUnion        rR2;
  87   StgUnion        rR3;
  88   StgUnion        rR4;
  89   StgUnion        rR5;
  90   StgUnion        rR6;
  91   StgUnion        rR7;
  92   StgUnion        rR8;
  93   StgUnion        rR9;          /* used occasionally by heap/stack checks */
  94   StgUnion        rR10;         /* used occasionally by heap/stack checks */
  95   StgFloat        rF1;
  96   StgFloat        rF2;
  97   StgFloat        rF3;
  98   StgFloat        rF4;
  99   StgDouble       rD1;
 100   StgDouble       rD2;
 101   StgWord64       rL1;
 102   StgPtr          rSp;
 103   StgPtr          rSpLim;
 104   StgPtr          rHp;
 105   StgPtr          rHpLim;
 106   struct StgTSO_ *rCurrentTSO;
 107   struct step_   *rNursery;
 108   struct bdescr_ *rCurrentNursery; /* Hp/HpLim point into this block */
 109   struct bdescr_ *rCurrentAlloc;   /* for allocation using allocate() */
 110   StgWord         rHpAlloc;     /* number of *bytes* being allocated in heap */
 111   // rmp_tmp1..rmp_result2 are only used in THREADED_RTS builds to
 112   // avoid per-thread temps in bss, but currently always incldue here
 113   // so we just run mkDerivedConstants once
 114   StgWord         rmp_tmp_w;
 115   MP_INT          rmp_tmp1;
 116   MP_INT          rmp_tmp2;
 117   MP_INT          rmp_result1;
 118   MP_INT          rmp_result2;
 119   StgWord         rRet;  // holds the return code of the thread
 120   StgSparkPool    rSparks;      /* per-task spark pool */
 121 } StgRegTable;
 122
 123 #if IN_STG_CODE
 124
 125 /*
 126  * Registers Hp and HpLim are global across the entire system, and are
 127  * copied into the RegTable before executing a thread.
 128  *
 129  * Registers Sp and SpLim are saved in the TSO for the
 130  * thread, but are copied into the RegTable before executing a thread.
 131  *
 132  * All other registers are "general purpose", and are used for passing
 133  * arguments to functions, and returning values.  The code generator
 134  * knows how many of these are in real registers, and avoids
 135  * generating code that uses non-real registers.  General purpose
 136  * registers are never saved when returning to the scheduler, instead
 137  * we save whatever is live at the time on the stack, and restore it
 138  * later.  This should reduce the context switch time, amongst other
 139  * things.
 140  *
 141  * For argument passing, the stack will be used in preference to
 142  * pseudo-registers if the architecture has too few general purpose
 143  * registers.
 144  *
 145  * Some special RTS functions like newArray and the Integer primitives
 146  * expect their arguments to be in registers R1-Rn, so we use these
 147  * (pseudo-)registers in those cases.
 148  */
 149
 150 /*
 151  * Locations for saving per-thread registers.
 152  */
 153
 154 #define SAVE_Sp             (CurrentTSO->sp)
 155 #define SAVE_SpLim          (CurrentTSO->splim)
 156
 157 #define SAVE_Hp             (BaseReg->rHp)
 158 #define SAVE_HpLim          (BaseReg->rHpLim)
 159
 160 #define SAVE_CurrentTSO     (BaseReg->rCurrentTSO)
 161 #define SAVE_CurrentNursery (BaseReg->rCurrentNursery)
 162 #define SAVE_HpAlloc        (BaseReg->rHpAlloc)
 163 #define SAVE_SparkHd        (BaseReg->rSparks.hd)
 164 #define SAVE_SparkTl        (BaseReg->rSparks.tl)
 165 #define SAVE_SparkBase      (BaseReg->rSparks.base)
 166 #define SAVE_SparkLim       (BaseReg->rSparks.lim)
 167
 168 /* We sometimes need to save registers across a C-call, eg. if they
 169  * are clobbered in the standard calling convention.  We define the
 170  * save locations for all registers in the register table.
 171  */
 172
 173 #define SAVE_R1             (BaseReg->rR1)
 174 #define SAVE_R2             (BaseReg->rR2)
 175 #define SAVE_R3             (BaseReg->rR3)
 176 #define SAVE_R4             (BaseReg->rR4)
 177 #define SAVE_R5             (BaseReg->rR5)
 178 #define SAVE_R6             (BaseReg->rR6)
 179 #define SAVE_R7             (BaseReg->rR7)
 180 #define SAVE_R8             (BaseReg->rR8)
 181
 182 #define SAVE_F1             (BaseReg->rF1)
 183 #define SAVE_F2             (BaseReg->rF2)
 184 #define SAVE_F3             (BaseReg->rF3)
 185 #define SAVE_F4             (BaseReg->rF4)
 186
 187 #define SAVE_D1             (BaseReg->rD1)
 188 #define SAVE_D2             (BaseReg->rD2)
 189
 190 #define SAVE_L1             (BaseReg->rL1)
 191
 192 /* -----------------------------------------------------------------------------
 193  * Emit the GCC-specific register declarations for each machine
 194  * register being used.  If any STG register isn't mapped to a machine
 195  * register, then map it to an offset from BaseReg.
 196  *
 197  * First, the general purpose registers.  The idea is, if a particular
 198  * general-purpose STG register can't be mapped to a real machine
 199  * register, it won't be used at all.  Instead, we'll use the stack.
 200  *
 201  * This is an improvement on the way things used to be done, when all
 202  * registers were mapped to locations in the register table, and stuff
 203  * was being shifted from the stack to the register table and back
 204  * again for no good reason (on register-poor architectures).
 205  */
 206
 207 /* define NO_REGS to omit register declarations - used in RTS C code
 208  * that needs all the STG definitions but not the global register
 209  * settings.
 210  */
 211 #define GLOBAL_REG_DECL(type,name,reg) register type name REG(reg);
 212
 213 #if defined(REG_R1) && !defined(NO_GLOBAL_REG_DECLS)
 214 GLOBAL_REG_DECL(StgUnion,R1,REG_R1)
 215 #else
 216 # define R1 (BaseReg->rR1)
 217 #endif
 218
 219 #if defined(REG_R2) && !defined(NO_GLOBAL_REG_DECLS)
 220 GLOBAL_REG_DECL(StgUnion,R2,REG_R2)
 221 #else
 222 # define R2 (BaseReg->rR2)
 223 #endif
 224
 225 #if defined(REG_R3) && !defined(NO_GLOBAL_REG_DECLS)
 226 GLOBAL_REG_DECL(StgUnion,R3,REG_R3)
 227 #else
 228 # define R3 (BaseReg->rR3)
 229 #endif
 230
 231 #if defined(REG_R4) && !defined(NO_GLOBAL_REG_DECLS)
 232 GLOBAL_REG_DECL(StgUnion,R4,REG_R4)
 233 #else
 234 # define R4 (BaseReg->rR4)
 235 #endif
 236
 237 #if defined(REG_R5) && !defined(NO_GLOBAL_REG_DECLS)
 238 GLOBAL_REG_DECL(StgUnion,R5,REG_R5)
 239 #else
 240 # define R5 (BaseReg->rR5)
 241 #endif
 242
 243 #if defined(REG_R6) && !defined(NO_GLOBAL_REG_DECLS)
 244 GLOBAL_REG_DECL(StgUnion,R6,REG_R6)
 245 #else
 246 # define R6 (BaseReg->rR6)
 247 #endif
 248
 249 #if defined(REG_R7) && !defined(NO_GLOBAL_REG_DECLS)
 250 GLOBAL_REG_DECL(StgUnion,R7,REG_R7)
 251 #else
 252 # define R7 (BaseReg->rR7)
 253 #endif
 254
 255 #if defined(REG_R8) && !defined(NO_GLOBAL_REG_DECLS)
 256 GLOBAL_REG_DECL(StgUnion,R8,REG_R8)
 257 #else
 258 # define R8 (BaseReg->rR8)
 259 #endif
 260
 261 #if defined(REG_R9) && !defined(NO_GLOBAL_REG_DECLS)
 262 GLOBAL_REG_DECL(StgUnion,R9,REG_R9)
 263 #else
 264 # define R9 (BaseReg->rR9)
 265 #endif
 266
 267 #if defined(REG_R10) && !defined(NO_GLOBAL_REG_DECLS)
 268 GLOBAL_REG_DECL(StgUnion,R10,REG_R10)
 269 #else
 270 # define R10 (BaseReg->rR10)
 271 #endif
 272
 273 #if defined(REG_F1) && !defined(NO_GLOBAL_REG_DECLS)
 274 GLOBAL_REG_DECL(StgFloat,F1,REG_F1)
 275 #else
 276 #define F1 (BaseReg->rF1)
 277 #endif
 278
 279 #if defined(REG_F2) && !defined(NO_GLOBAL_REG_DECLS)
 280 GLOBAL_REG_DECL(StgFloat,F2,REG_F2)
 281 #else
 282 #define F2 (BaseReg->rF2)
 283 #endif
 284
 285 #if defined(REG_F3) && !defined(NO_GLOBAL_REG_DECLS)
 286 GLOBAL_REG_DECL(StgFloat,F3,REG_F3)
 287 #else
 288 #define F3 (BaseReg->rF3)
 289 #endif
 290
 291 #if defined(REG_F4) && !defined(NO_GLOBAL_REG_DECLS)
 292 GLOBAL_REG_DECL(StgFloat,F4,REG_F4)
 293 #else
 294 #define F4 (BaseReg->rF4)
 295 #endif
 296
 297 #if defined(REG_D1) && !defined(NO_GLOBAL_REG_DECLS)
 298 GLOBAL_REG_DECL(StgDouble,D1,REG_D1)
 299 #else
 300 #define D1 (BaseReg->rD1)
 301 #endif
 302
 303 #if defined(REG_D2) && !defined(NO_GLOBAL_REG_DECLS)
 304 GLOBAL_REG_DECL(StgDouble,D2,REG_D2)
 305 #else
 306 #define D2 (BaseReg->rD2)
 307 #endif
 308
 309 #if defined(REG_L1) && !defined(NO_GLOBAL_REG_DECLS)
 310 GLOBAL_REG_DECL(StgWord64,L1,REG_L1)
 311 #else
 312 #define L1 (BaseReg->rL1)
 313 #endif
 314
 315 /*
 316  * If BaseReg isn't mapped to a machine register, just use the global
 317  * address of the current register table (CurrentRegTable in
 318  * concurrent Haskell, MainRegTable otherwise).
 319  */
 320
 321 /* A capability is a combination of a FunTable and a RegTable.  In STG
 322  * code, BaseReg normally points to the RegTable portion of this
 323  * structure, so that we can index both forwards and backwards to take
 324  * advantage of shorter instruction forms on some archs (eg. x86).
 325  * This is a cut-down version of the Capability structure; the full
 326  * version is defined in Capability.h.
 327  */
 328 struct PartCapability_ {
 329     StgFunTable f;
 330     StgRegTable r;
 331 };
 332
 333 /* No such thing as a MainCapability under THREADED_RTS - each thread must have
 334  * its own Capability.
 335  */
 336 #if IN_STG_CODE && !(defined(THREADED_RTS) && !defined(NOSMP))
 337 extern W_ MainCapability[];
 338 #endif
 339
 340 /*
 341  * Assigning to BaseReg (the ASSIGN_BaseReg macro): this happens on
 342  * return from a "safe" foreign call, when the thread might be running
 343  * on a new Capability.  Obviously if BaseReg is not a register, then
 344  * we are restricted to a single Capability (this invariant is enforced
 345  * in Capability.c:initCapabilities), and assigning to BaseReg can be omitted.
 346  */
 347
 348 #if defined(REG_Base) && !defined(NO_GLOBAL_REG_DECLS)
 349 GLOBAL_REG_DECL(StgRegTable *,BaseReg,REG_Base)
 350 #define ASSIGN_BaseReg(e) (BaseReg = (e))
 351 #else
 352 #if defined(THREADED_RTS) && !defined(NOSMP)
 353 #error BaseReg must be in a register for THREADED_RTS
 354 #endif
 355 #define BaseReg (&((struct PartCapability_ *)MainCapability)->r)
 356 #define ASSIGN_BaseReg(e) (e)
 357 #endif
 358
 359 #if defined(REG_Sp) && !defined(NO_GLOBAL_REG_DECLS)
 360 GLOBAL_REG_DECL(P_,Sp,REG_Sp)
 361 #else
 362 #define Sp (BaseReg->rSp)
 363 #endif
 364
 365 #if defined(REG_SpLim) && !defined(NO_GLOBAL_REG_DECLS)
 366 GLOBAL_REG_DECL(P_,SpLim,REG_SpLim)
 367 #else
 368 #define SpLim (BaseReg->rSpLim)
 369 #endif
 370
 371 #if defined(REG_Hp) && !defined(NO_GLOBAL_REG_DECLS)
 372 GLOBAL_REG_DECL(P_,Hp,REG_Hp)
 373 #else
 374 #define Hp (BaseReg->rHp)
 375 #endif
 376
 377 #if defined(REG_HpLim) && !defined(NO_GLOBAL_REG_DECLS)
 378 GLOBAL_REG_DECL(P_,HpLim,REG_HpLim)
 379 #else
 380 #define HpLim (BaseReg->rHpLim)
 381 #endif
 382
 383 #if defined(REG_CurrentTSO) && !defined(NO_GLOBAL_REG_DECLS)
 384 GLOBAL_REG_DECL(struct _StgTSO *,CurrentTSO,REG_CurrentTSO)
 385 #else
 386 #define CurrentTSO (BaseReg->rCurrentTSO)
 387 #endif
 388
 389 #if defined(REG_CurrentNursery) && !defined(NO_GLOBAL_REG_DECLS)
 390 GLOBAL_REG_DECL(bdescr *,CurrentNursery,REG_CurrentNursery)
 391 #else
 392 #define CurrentNursery (BaseReg->rCurrentNursery)
 393 #endif
 394
 395 #if defined(REG_HpAlloc) && !defined(NO_GLOBAL_REG_DECLS)
 396 GLOBAL_REG_DECL(bdescr *,HpAlloc,REG_HpAlloc)
 397 #else
 398 #define HpAlloc (BaseReg->rHpAlloc)
 399 #endif
 400
 401 #if defined(REG_SparkHd) && !defined(NO_GLOBAL_REG_DECLS)
 402 GLOBAL_REG_DECL(bdescr *,SparkHd,REG_SparkHd)
 403 #else
 404 #define SparkHd (BaseReg->rSparks.hd)
 405 #endif
 406
 407 #if defined(REG_SparkTl) && !defined(NO_GLOBAL_REG_DECLS)
 408 GLOBAL_REG_DECL(bdescr *,SparkTl,REG_SparkTl)
 409 #else
 410 #define SparkTl (BaseReg->rSparks.tl)
 411 #endif
 412
 413 #if defined(REG_SparkBase) && !defined(NO_GLOBAL_REG_DECLS)
 414 GLOBAL_REG_DECL(bdescr *,SparkBase,REG_SparkBase)
 415 #else
 416 #define SparkBase (BaseReg->rSparks.base)
 417 #endif
 418
 419 #if defined(REG_SparkLim) && !defined(NO_GLOBAL_REG_DECLS)
 420 GLOBAL_REG_DECL(bdescr *,SparkLim,REG_SparkLim)
 421 #else
 422 #define SparkLim (BaseReg->rSparks.lim)
 423 #endif
 424
 425 /* -----------------------------------------------------------------------------
 426    Get absolute function pointers from the register table, to save
 427    code space.  On x86,
 428
 429        jmp  *-12(%ebx)
 430
 431    is shorter than
 432
 433        jmp absolute_address
 434
 435    as long as the offset is within the range of a signed byte
 436    (-128..+127).  So we pick some common absolute_addresses and put
 437    them in the register table.  As a bonus, linking time should also
 438    be reduced.
 439
 440    Other possible candidates in order of importance:
 441
 442      stg_upd_frame_info
 443      stg_CAF_BLACKHOLE_info
 444      stg_IND_STATIC_info
 445
 446    anything else probably isn't worth the effort.
 447
 448    -------------------------------------------------------------------------- */
 449
 450
 451 #define FunReg ((StgFunTable *)((void *)BaseReg - sizeof(StgFunTable)))
 452
 453 #define stg_gc_enter_1     (FunReg->stgGCEnter1)
 454 #define stg_gc_fun         (FunReg->stgGCFun)
 455
 456 /* -----------------------------------------------------------------------------
 457    For any registers which are denoted "caller-saves" by the C calling
 458    convention, we have to emit code to save and restore them across C
 459    calls.
 460    -------------------------------------------------------------------------- */
 461
 462 #ifdef CALLER_SAVES_R1
 463 #define CALLER_SAVE_R1          SAVE_R1 = R1;
 464 #define CALLER_RESTORE_R1       R1 = SAVE_R1;
 465 #else
 466 #define CALLER_SAVE_R1          /* nothing */
 467 #define CALLER_RESTORE_R1       /* nothing */
 468 #endif
 469
 470 #ifdef CALLER_SAVES_R2
 471 #define CALLER_SAVE_R2          SAVE_R2 = R2;
 472 #define CALLER_RESTORE_R2       R2 = SAVE_R2;
 473 #else
 474 #define CALLER_SAVE_R2          /* nothing */
 475 #define CALLER_RESTORE_R2       /* nothing */
 476 #endif
 477
 478 #ifdef CALLER_SAVES_R3
 479 #define CALLER_SAVE_R3          SAVE_R3 = R3;
 480 #define CALLER_RESTORE_R3       R3 = SAVE_R3;
 481 #else
 482 #define CALLER_SAVE_R3          /* nothing */
 483 #define CALLER_RESTORE_R3       /* nothing */
 484 #endif
 485
 486 #ifdef CALLER_SAVES_R4
 487 #define CALLER_SAVE_R4          SAVE_R4 = R4;
 488 #define CALLER_RESTORE_R4       R4 = SAVE_R4;
 489 #else
 490 #define CALLER_SAVE_R4          /* nothing */
 491 #define CALLER_RESTORE_R4       /* nothing */
 492 #endif
 493
 494 #ifdef CALLER_SAVES_R5
 495 #define CALLER_SAVE_R5          SAVE_R5 = R5;
 496 #define CALLER_RESTORE_R5       R5 = SAVE_R5;
 497 #else
 498 #define CALLER_SAVE_R5          /* nothing */
 499 #define CALLER_RESTORE_R5       /* nothing */
 500 #endif
 501
 502 #ifdef CALLER_SAVES_R6
 503 #define CALLER_SAVE_R6          SAVE_R6 = R6;
 504 #define CALLER_RESTORE_R6       R6 = SAVE_R6;
 505 #else
 506 #define CALLER_SAVE_R6          /* nothing */
 507 #define CALLER_RESTORE_R6       /* nothing */
 508 #endif
 509
 510 #ifdef CALLER_SAVES_R7
 511 #define CALLER_SAVE_R7          SAVE_R7 = R7;
 512 #define CALLER_RESTORE_R7       R7 = SAVE_R7;
 513 #else
 514 #define CALLER_SAVE_R7          /* nothing */
 515 #define CALLER_RESTORE_R7       /* nothing */
 516 #endif
 517
 518 #ifdef CALLER_SAVES_R8
 519 #define CALLER_SAVE_R8          SAVE_R8 = R8;
 520 #define CALLER_RESTORE_R8       R8 = SAVE_R8;
 521 #else
 522 #define CALLER_SAVE_R8          /* nothing */
 523 #define CALLER_RESTORE_R8       /* nothing */
 524 #endif
 525
 526 #ifdef CALLER_SAVES_R9
 527 #define CALLER_SAVE_R9          SAVE_R9 = R9;
 528 #define CALLER_RESTORE_R9       R9 = SAVE_R9;
 529 #else
 530 #define CALLER_SAVE_R9          /* nothing */
 531 #define CALLER_RESTORE_R9       /* nothing */
 532 #endif
 533
 534 #ifdef CALLER_SAVES_R10
 535 #define CALLER_SAVE_R10         SAVE_R10 = R10;
 536 #define CALLER_RESTORE_R10      R10 = SAVE_R10;
 537 #else
 538 #define CALLER_SAVE_R10         /* nothing */
 539 #define CALLER_RESTORE_R10      /* nothing */
 540 #endif
 541
 542 #ifdef CALLER_SAVES_F1
 543 #define CALLER_SAVE_F1          SAVE_F1 = F1;
 544 #define CALLER_RESTORE_F1       F1 = SAVE_F1;
 545 #else
 546 #define CALLER_SAVE_F1          /* nothing */
 547 #define CALLER_RESTORE_F1       /* nothing */
 548 #endif
 549
 550 #ifdef CALLER_SAVES_F2
 551 #define CALLER_SAVE_F2          SAVE_F2 = F2;
 552 #define CALLER_RESTORE_F2       F2 = SAVE_F2;
 553 #else
 554 #define CALLER_SAVE_F2          /* nothing */
 555 #define CALLER_RESTORE_F2       /* nothing */
 556 #endif
 557
 558 #ifdef CALLER_SAVES_F3
 559 #define CALLER_SAVE_F3          SAVE_F3 = F3;
 560 #define CALLER_RESTORE_F3       F3 = SAVE_F3;
 561 #else
 562 #define CALLER_SAVE_F3          /* nothing */
 563 #define CALLER_RESTORE_F3       /* nothing */
 564 #endif
 565
 566 #ifdef CALLER_SAVES_F4
 567 #define CALLER_SAVE_F4          SAVE_F4 = F4;
 568 #define CALLER_RESTORE_F4       F4 = SAVE_F4;
 569 #else
 570 #define CALLER_SAVE_F4          /* nothing */
 571 #define CALLER_RESTORE_F4       /* nothing */
 572 #endif
 573
 574 #ifdef CALLER_SAVES_D1
 575 #define CALLER_SAVE_D1          SAVE_D1 = D1;
 576 #define CALLER_RESTORE_D1       D1 = SAVE_D1;
 577 #else
 578 #define CALLER_SAVE_D1          /* nothing */
 579 #define CALLER_RESTORE_D1       /* nothing */
 580 #endif
 581
 582 #ifdef CALLER_SAVES_D2
 583 #define CALLER_SAVE_D2          SAVE_D2 = D2;
 584 #define CALLER_RESTORE_D2       D2 = SAVE_D2;
 585 #else
 586 #define CALLER_SAVE_D2          /* nothing */
 587 #define CALLER_RESTORE_D2       /* nothing */
 588 #endif
 589
 590 #ifdef CALLER_SAVES_L1
 591 #define CALLER_SAVE_L1          SAVE_L1 = L1;
 592 #define CALLER_RESTORE_L1       L1 = SAVE_L1;
 593 #else
 594 #define CALLER_SAVE_L1          /* nothing */
 595 #define CALLER_RESTORE_L1       /* nothing */
 596 #endif
 597
 598 #ifdef CALLER_SAVES_Sp
 599 #define CALLER_SAVE_Sp          SAVE_Sp = Sp;
 600 #define CALLER_RESTORE_Sp       Sp = SAVE_Sp;
 601 #else
 602 #define CALLER_SAVE_Sp          /* nothing */
 603 #define CALLER_RESTORE_Sp       /* nothing */
 604 #endif
 605
 606 #ifdef CALLER_SAVES_SpLim
 607 #define CALLER_SAVE_SpLim       SAVE_SpLim = SpLim;
 608 #define CALLER_RESTORE_SpLim    SpLim = SAVE_SpLim;
 609 #else
 610 #define CALLER_SAVE_SpLim       /* nothing */
 611 #define CALLER_RESTORE_SpLim    /* nothing */
 612 #endif
 613
 614 #ifdef CALLER_SAVES_Hp
 615 #define CALLER_SAVE_Hp          SAVE_Hp = Hp;
 616 #define CALLER_RESTORE_Hp       Hp = SAVE_Hp;
 617 #else
 618 #define CALLER_SAVE_Hp          /* nothing */
 619 #define CALLER_RESTORE_Hp       /* nothing */
 620 #endif
 621
 622 #ifdef CALLER_SAVES_HpLim
 623 #define CALLER_SAVE_HpLim       SAVE_HpLim = HpLim;
 624 #define CALLER_RESTORE_HpLim    HpLim = SAVE_HpLim;
 625 #else
 626 #define CALLER_SAVE_HpLim       /* nothing */
 627 #define CALLER_RESTORE_HpLim    /* nothing */
 628 #endif
 629
 630 #ifdef CALLER_SAVES_Base
 631 #ifdef THREADED_RTS
 632 #error "Can't have caller-saved BaseReg with THREADED_RTS"
 633 #endif
 634 #define CALLER_SAVE_Base        /* nothing */
 635 #define CALLER_RESTORE_Base     BaseReg = &MainRegTable;
 636 #else
 637 #define CALLER_SAVE_Base        /* nothing */
 638 #define CALLER_RESTORE_Base     /* nothing */
 639 #endif
 640
 641 #ifdef CALLER_SAVES_CurrentTSO
 642 #define CALLER_SAVE_CurrentTSO          SAVE_CurrentTSO = CurrentTSO;
 643 #define CALLER_RESTORE_CurrentTSO       CurrentTSO = SAVE_CurrentTSO;
 644 #else
 645 #define CALLER_SAVE_CurrentTSO          /* nothing */
 646 #define CALLER_RESTORE_CurrentTSO       /* nothing */
 647 #endif
 648
 649 #ifdef CALLER_SAVES_CurrentNursery
 650 #define CALLER_SAVE_CurrentNursery      SAVE_CurrentNursery = CurrentNursery;
 651 #define CALLER_RESTORE_CurrentNursery   CurrentNursery = SAVE_CurrentNursery;
 652 #else
 653 #define CALLER_SAVE_CurrentNursery      /* nothing */
 654 #define CALLER_RESTORE_CurrentNursery   /* nothing */
 655 #endif
 656
 657 #ifdef CALLER_SAVES_HpAlloc
 658 #define CALLER_SAVE_HpAlloc             SAVE_HpAlloc = HpAlloc;
 659 #define CALLER_RESTORE_HpAlloc          HpAlloc = SAVE_HpAlloc;
 660 #else
 661 #define CALLER_SAVE_HpAlloc             /* nothing */
 662 #define CALLER_RESTORE_HpAlloc          /* nothing */
 663 #endif
 664
 665 #ifdef CALLER_SAVES_SparkHd
 666 #define CALLER_SAVE_SparkHd             SAVE_SparkHd = SparkHd;
 667 #define CALLER_RESTORE_SparkHd          SparkHd = SAVE_SparkHd;
 668 #else
 669 #define CALLER_SAVE_SparkHd             /* nothing */
 670 #define CALLER_RESTORE_SparkHd          /* nothing */
 671 #endif
 672
 673 #ifdef CALLER_SAVES_SparkTl
 674 #define CALLER_SAVE_SparkTl             SAVE_SparkTl = SparkTl;
 675 #define CALLER_RESTORE_SparkTl          SparkTl = SAVE_SparkTl;
 676 #else
 677 #define CALLER_SAVE_SparkTl             /* nothing */
 678 #define CALLER_RESTORE_SparkTl          /* nothing */
 679 #endif
 680
 681 #ifdef CALLER_SAVES_SparkBase
 682 #define CALLER_SAVE_SparkBase           SAVE_SparkBase = SparkBase;
 683 #define CALLER_RESTORE_SparkBase        SparkBase = SAVE_SparkBase;
 684 #else
 685 #define CALLER_SAVE_SparkBase           /* nothing */
 686 #define CALLER_RESTORE_SparkBase        /* nothing */
 687 #endif
 688
 689 #ifdef CALLER_SAVES_SparkLim
 690 #define CALLER_SAVE_SparkLim            SAVE_SparkLim = SparkLim;
 691 #define CALLER_RESTORE_SparkLim         SparkLim = SAVE_SparkLim;
 692 #else
 693 #define CALLER_SAVE_SparkLim            /* nothing */
 694 #define CALLER_RESTORE_SparkLim         /* nothing */
 695 #endif
 696
 697 #endif /* IN_STG_CODE */
 698
 699 /* ----------------------------------------------------------------------------
 700    Handy bunches of saves/restores
 701    ------------------------------------------------------------------------  */
 702
 703 #if IN_STG_CODE
 704
 705 #define CALLER_SAVE_USER                        \
 706   CALLER_SAVE_R1                                \
 707   CALLER_SAVE_R2                                \
 708   CALLER_SAVE_R3                                \
 709   CALLER_SAVE_R4                                \
 710   CALLER_SAVE_R5                                \
 711   CALLER_SAVE_R6                                \
 712   CALLER_SAVE_R7                                \
 713   CALLER_SAVE_R8                                \
 714   CALLER_SAVE_F1                                \
 715   CALLER_SAVE_F2                                \
 716   CALLER_SAVE_F3                                \
 717   CALLER_SAVE_F4                                \
 718   CALLER_SAVE_D1                                \
 719   CALLER_SAVE_D2                                \
 720   CALLER_SAVE_L1
 721
 722      /* Save Base last, since the others may
 723         be addressed relative to it */
 724 #define CALLER_SAVE_SYSTEM                      \
 725   CALLER_SAVE_Sp                                \
 726   CALLER_SAVE_SpLim                             \
 727   CALLER_SAVE_Hp                                \
 728   CALLER_SAVE_HpLim                             \
 729   CALLER_SAVE_CurrentTSO                        \
 730   CALLER_SAVE_CurrentNursery                    \
 731   CALLER_SAVE_SparkHd                           \
 732   CALLER_SAVE_SparkTl                           \
 733   CALLER_SAVE_SparkBase                         \
 734   CALLER_SAVE_SparkLim                          \
 735   CALLER_SAVE_Base
 736
 737 #define CALLER_RESTORE_USER                     \
 738   CALLER_RESTORE_R1                             \
 739   CALLER_RESTORE_R2                             \
 740   CALLER_RESTORE_R3                             \
 741   CALLER_RESTORE_R4                             \
 742   CALLER_RESTORE_R5                             \
 743   CALLER_RESTORE_R6                             \
 744   CALLER_RESTORE_R7                             \
 745   CALLER_RESTORE_R8                             \
 746   CALLER_RESTORE_F1                             \
 747   CALLER_RESTORE_F2                             \
 748   CALLER_RESTORE_F3                             \
 749   CALLER_RESTORE_F4                             \
 750   CALLER_RESTORE_D1                             \
 751   CALLER_RESTORE_D2                             \
 752   CALLER_RESTORE_L1
 753
 754      /* Restore Base first, since the others may
 755         be addressed relative to it */
 756 #define CALLER_RESTORE_SYSTEM                   \
 757   CALLER_RESTORE_Base                           \
 758   CALLER_RESTORE_Sp                             \
 759   CALLER_RESTORE_SpLim                          \
 760   CALLER_RESTORE_Hp                             \
 761   CALLER_RESTORE_HpLim                          \
 762   CALLER_RESTORE_CurrentTSO                     \
 763   CALLER_RESTORE_CurrentNursery                 \
 764   CALLER_RESTORE_SparkHd                        \
 765   CALLER_RESTORE_SparkTl                        \
 766   CALLER_RESTORE_SparkBase                      \
 767   CALLER_RESTORE_SparkLim
 768
 769 #else /* not IN_STG_CODE */
 770
 771 #define CALLER_SAVE_USER       /* nothing */
 772 #define CALLER_SAVE_SYSTEM     /* nothing */
 773 #define CALLER_RESTORE_USER    /* nothing */
 774 #define CALLER_RESTORE_SYSTEM  /* nothing */
 775
 776 #endif /* IN_STG_CODE */
 777 #define CALLER_SAVE_ALL                         \
 778   CALLER_SAVE_SYSTEM                            \
 779   CALLER_SAVE_USER
 780
 781 #define CALLER_RESTORE_ALL                      \
 782   CALLER_RESTORE_SYSTEM                         \
 783   CALLER_RESTORE_USER
 784
 785 #endif /* REGS_H */