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