1 /* -----------------------------------------------------------------------------
3 * (c) The GHC Team, 1998-2004
5 * Registers in the STG machine.
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
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
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).
20 * ---------------------------------------------------------------------------*/
25 #include "gmp.h" // Needs MP_INT definition
28 * This is the table that holds shadow-locations for all the STG
29 * registers. The shadow locations are used when:
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
36 typedef struct StgSparkPool_ {
44 StgFunPtr stgGCEnter1;
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.
62 StgStackOffset offset; /* unused? */
67 typedef struct StgRegTable_ {
76 StgUnion rR9; /* used occasionally by heap/stack checks */
77 StgUnion rR10; /* used occasionally by heap/stack checks */
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
101 #if defined(SMP) || defined(PAR)
102 StgSparkPool rSparks; /* per-task spark pool */
104 StgWord rInHaskell; /* non-zero if we're in Haskell code */
105 // If this flag is set, we are running Haskell code. Used to detect
106 // uses of 'foreign import unsafe' that should be 'safe'.
110 /* A capability is a combination of a FunTable and a RegTable. In STG
111 * code, BaseReg normally points to the RegTable portion of this
112 * structure, so that we can index both forwards and backwards to take
113 * advantage of shorter instruction forms on some archs (eg. x86).
115 typedef struct Capability_ {
119 struct Capability_ *link; /* per-task register tables are linked together */
123 /* No such thing as a MainCapability under SMP - each thread must have
124 * its own Capability.
128 extern W_ MainCapability[];
130 extern DLL_IMPORT_RTS Capability MainCapability;
137 * Registers Hp and HpLim are global across the entire system, and are
138 * copied into the RegTable before executing a thread.
140 * Registers Sp and SpLim are saved in the TSO for the
141 * thread, but are copied into the RegTable before executing a thread.
143 * All other registers are "general purpose", and are used for passing
144 * arguments to functions, and returning values. The code generator
145 * knows how many of these are in real registers, and avoids
146 * generating code that uses non-real registers. General purpose
147 * registers are never saved when returning to the scheduler, instead
148 * we save whatever is live at the time on the stack, and restore it
149 * later. This should reduce the context switch time, amongst other
152 * For argument passing, the stack will be used in preference to
153 * pseudo-registers if the architecture has too few general purpose
156 * Some special RTS functions like newArray and the Integer primitives
157 * expect their arguments to be in registers R1-Rn, so we use these
158 * (pseudo-)registers in those cases.
162 * Locations for saving per-thread registers.
165 #define SAVE_Sp (CurrentTSO->sp)
166 #define SAVE_SpLim (CurrentTSO->splim)
168 #define SAVE_Hp (BaseReg->rHp)
169 #define SAVE_HpLim (BaseReg->rHpLim)
171 #define SAVE_CurrentTSO (BaseReg->rCurrentTSO)
172 #define SAVE_CurrentNursery (BaseReg->rCurrentNursery)
173 #define SAVE_HpAlloc (BaseReg->rHpAlloc)
174 #define SAVE_SparkHd (BaseReg->rSparks.hd)
175 #define SAVE_SparkTl (BaseReg->rSparks.tl)
176 #define SAVE_SparkBase (BaseReg->rSparks.base)
177 #define SAVE_SparkLim (BaseReg->rSparks.lim)
179 /* We sometimes need to save registers across a C-call, eg. if they
180 * are clobbered in the standard calling convention. We define the
181 * save locations for all registers in the register table.
184 #define SAVE_R1 (BaseReg->rR1)
185 #define SAVE_R2 (BaseReg->rR2)
186 #define SAVE_R3 (BaseReg->rR3)
187 #define SAVE_R4 (BaseReg->rR4)
188 #define SAVE_R5 (BaseReg->rR5)
189 #define SAVE_R6 (BaseReg->rR6)
190 #define SAVE_R7 (BaseReg->rR7)
191 #define SAVE_R8 (BaseReg->rR8)
193 #define SAVE_F1 (BaseReg->rF1)
194 #define SAVE_F2 (BaseReg->rF2)
195 #define SAVE_F3 (BaseReg->rF3)
196 #define SAVE_F4 (BaseReg->rF4)
198 #define SAVE_D1 (BaseReg->rD1)
199 #define SAVE_D2 (BaseReg->rD2)
201 #define SAVE_L1 (BaseReg->rL1)
203 /* -----------------------------------------------------------------------------
204 * Emit the GCC-specific register declarations for each machine
205 * register being used. If any STG register isn't mapped to a machine
206 * register, then map it to an offset from BaseReg.
208 * First, the general purpose registers. The idea is, if a particular
209 * general-purpose STG register can't be mapped to a real machine
210 * register, it won't be used at all. Instead, we'll use the stack.
212 * This is an improvement on the way things used to be done, when all
213 * registers were mapped to locations in the register table, and stuff
214 * was being shifted from the stack to the register table and back
215 * again for no good reason (on register-poor architectures).
218 /* define NO_REGS to omit register declarations - used in RTS C code
219 * that needs all the STG definitions but not the global register
222 #define GLOBAL_REG_DECL(type,name,reg) register type name REG(reg);
224 #if defined(REG_R1) && !defined(NO_GLOBAL_REG_DECLS)
225 GLOBAL_REG_DECL(StgUnion,R1,REG_R1)
227 # define R1 (BaseReg->rR1)
230 #if defined(REG_R2) && !defined(NO_GLOBAL_REG_DECLS)
231 GLOBAL_REG_DECL(StgUnion,R2,REG_R2)
233 # define R2 (BaseReg->rR2)
236 #if defined(REG_R3) && !defined(NO_GLOBAL_REG_DECLS)
237 GLOBAL_REG_DECL(StgUnion,R3,REG_R3)
239 # define R3 (BaseReg->rR3)
242 #if defined(REG_R4) && !defined(NO_GLOBAL_REG_DECLS)
243 GLOBAL_REG_DECL(StgUnion,R4,REG_R4)
245 # define R4 (BaseReg->rR4)
248 #if defined(REG_R5) && !defined(NO_GLOBAL_REG_DECLS)
249 GLOBAL_REG_DECL(StgUnion,R5,REG_R5)
251 # define R5 (BaseReg->rR5)
254 #if defined(REG_R6) && !defined(NO_GLOBAL_REG_DECLS)
255 GLOBAL_REG_DECL(StgUnion,R6,REG_R6)
257 # define R6 (BaseReg->rR6)
260 #if defined(REG_R7) && !defined(NO_GLOBAL_REG_DECLS)
261 GLOBAL_REG_DECL(StgUnion,R7,REG_R7)
263 # define R7 (BaseReg->rR7)
266 #if defined(REG_R8) && !defined(NO_GLOBAL_REG_DECLS)
267 GLOBAL_REG_DECL(StgUnion,R8,REG_R8)
269 # define R8 (BaseReg->rR8)
272 #if defined(REG_R9) && !defined(NO_GLOBAL_REG_DECLS)
273 GLOBAL_REG_DECL(StgUnion,R9,REG_R9)
275 # define R9 (BaseReg->rR9)
278 #if defined(REG_R10) && !defined(NO_GLOBAL_REG_DECLS)
279 GLOBAL_REG_DECL(StgUnion,R10,REG_R10)
281 # define R10 (BaseReg->rR10)
284 #if defined(REG_F1) && !defined(NO_GLOBAL_REG_DECLS)
285 GLOBAL_REG_DECL(StgFloat,F1,REG_F1)
287 #define F1 (BaseReg->rF1)
290 #if defined(REG_F2) && !defined(NO_GLOBAL_REG_DECLS)
291 GLOBAL_REG_DECL(StgFloat,F2,REG_F2)
293 #define F2 (BaseReg->rF2)
296 #if defined(REG_F3) && !defined(NO_GLOBAL_REG_DECLS)
297 GLOBAL_REG_DECL(StgFloat,F3,REG_F3)
299 #define F3 (BaseReg->rF3)
302 #if defined(REG_F4) && !defined(NO_GLOBAL_REG_DECLS)
303 GLOBAL_REG_DECL(StgFloat,F4,REG_F4)
305 #define F4 (BaseReg->rF4)
308 #if defined(REG_D1) && !defined(NO_GLOBAL_REG_DECLS)
309 GLOBAL_REG_DECL(StgDouble,D1,REG_D1)
311 #define D1 (BaseReg->rD1)
314 #if defined(REG_D2) && !defined(NO_GLOBAL_REG_DECLS)
315 GLOBAL_REG_DECL(StgDouble,D2,REG_D2)
317 #define D2 (BaseReg->rD2)
320 #if defined(REG_L1) && !defined(NO_GLOBAL_REG_DECLS)
321 GLOBAL_REG_DECL(StgWord64,L1,REG_L1)
323 #define L1 (BaseReg->rL1)
327 * If BaseReg isn't mapped to a machine register, just use the global
328 * address of the current register table (CurrentRegTable in
329 * concurrent Haskell, MainRegTable otherwise).
332 #if defined(REG_Base) && !defined(NO_GLOBAL_REG_DECLS)
333 GLOBAL_REG_DECL(StgRegTable *,BaseReg,REG_Base)
336 #error BaseReg must be in a register for SMP
338 #define BaseReg (&((Capability *)MainCapability)[0].r)
341 #if defined(REG_Sp) && !defined(NO_GLOBAL_REG_DECLS)
342 GLOBAL_REG_DECL(P_,Sp,REG_Sp)
344 #define Sp (BaseReg->rSp)
347 #if defined(REG_SpLim) && !defined(NO_GLOBAL_REG_DECLS)
348 GLOBAL_REG_DECL(P_,SpLim,REG_SpLim)
350 #define SpLim (BaseReg->rSpLim)
353 #if defined(REG_Hp) && !defined(NO_GLOBAL_REG_DECLS)
354 GLOBAL_REG_DECL(P_,Hp,REG_Hp)
356 #define Hp (BaseReg->rHp)
359 #if defined(REG_HpLim) && !defined(NO_GLOBAL_REG_DECLS)
360 GLOBAL_REG_DECL(P_,HpLim,REG_HpLim)
362 #define HpLim (BaseReg->rHpLim)
365 #if defined(REG_CurrentTSO) && !defined(NO_GLOBAL_REG_DECLS)
366 GLOBAL_REG_DECL(struct _StgTSO *,CurrentTSO,REG_CurrentTSO)
368 #define CurrentTSO (BaseReg->rCurrentTSO)
371 #if defined(REG_CurrentNursery) && !defined(NO_GLOBAL_REG_DECLS)
372 GLOBAL_REG_DECL(bdescr *,CurrentNursery,REG_CurrentNursery)
374 #define CurrentNursery (BaseReg->rCurrentNursery)
377 #if defined(REG_HpAlloc) && !defined(NO_GLOBAL_REG_DECLS)
378 GLOBAL_REG_DECL(bdescr *,HpAlloc,REG_HpAlloc)
380 #define HpAlloc (BaseReg->rHpAlloc)
383 #if defined(REG_SparkHd) && !defined(NO_GLOBAL_REG_DECLS)
384 GLOBAL_REG_DECL(bdescr *,SparkHd,REG_SparkHd)
386 #define SparkHd (BaseReg->rSparks.hd)
389 #if defined(REG_SparkTl) && !defined(NO_GLOBAL_REG_DECLS)
390 GLOBAL_REG_DECL(bdescr *,SparkTl,REG_SparkTl)
392 #define SparkTl (BaseReg->rSparks.tl)
395 #if defined(REG_SparkBase) && !defined(NO_GLOBAL_REG_DECLS)
396 GLOBAL_REG_DECL(bdescr *,SparkBase,REG_SparkBase)
398 #define SparkBase (BaseReg->rSparks.base)
401 #if defined(REG_SparkLim) && !defined(NO_GLOBAL_REG_DECLS)
402 GLOBAL_REG_DECL(bdescr *,SparkLim,REG_SparkLim)
404 #define SparkLim (BaseReg->rSparks.lim)
407 /* -----------------------------------------------------------------------------
408 Get absolute function pointers from the register table, to save
417 as long as the offset is within the range of a signed byte
418 (-128..+127). So we pick some common absolute_addresses and put
419 them in the register table. As a bonus, linking time should also
422 Other possible candidates in order of importance:
425 stg_CAF_BLACKHOLE_info
428 anything else probably isn't worth the effort.
430 -------------------------------------------------------------------------- */
433 #define FunReg ((StgFunTable *)((void *)BaseReg - sizeof(StgFunTable)))
435 #define stg_gc_enter_1 (FunReg->stgGCEnter1)
436 #define stg_gc_fun (FunReg->stgGCFun)
438 /* -----------------------------------------------------------------------------
439 For any registers which are denoted "caller-saves" by the C calling
440 convention, we have to emit code to save and restore them across C
442 -------------------------------------------------------------------------- */
444 #ifdef CALLER_SAVES_R1
445 #define CALLER_SAVE_R1 SAVE_R1 = R1;
446 #define CALLER_RESTORE_R1 R1 = SAVE_R1;
448 #define CALLER_SAVE_R1 /* nothing */
449 #define CALLER_RESTORE_R1 /* nothing */
452 #ifdef CALLER_SAVES_R2
453 #define CALLER_SAVE_R2 SAVE_R2 = R2;
454 #define CALLER_RESTORE_R2 R2 = SAVE_R2;
456 #define CALLER_SAVE_R2 /* nothing */
457 #define CALLER_RESTORE_R2 /* nothing */
460 #ifdef CALLER_SAVES_R3
461 #define CALLER_SAVE_R3 SAVE_R3 = R3;
462 #define CALLER_RESTORE_R3 R3 = SAVE_R3;
464 #define CALLER_SAVE_R3 /* nothing */
465 #define CALLER_RESTORE_R3 /* nothing */
468 #ifdef CALLER_SAVES_R4
469 #define CALLER_SAVE_R4 SAVE_R4 = R4;
470 #define CALLER_RESTORE_R4 R4 = SAVE_R4;
472 #define CALLER_SAVE_R4 /* nothing */
473 #define CALLER_RESTORE_R4 /* nothing */
476 #ifdef CALLER_SAVES_R5
477 #define CALLER_SAVE_R5 SAVE_R5 = R5;
478 #define CALLER_RESTORE_R5 R5 = SAVE_R5;
480 #define CALLER_SAVE_R5 /* nothing */
481 #define CALLER_RESTORE_R5 /* nothing */
484 #ifdef CALLER_SAVES_R6
485 #define CALLER_SAVE_R6 SAVE_R6 = R6;
486 #define CALLER_RESTORE_R6 R6 = SAVE_R6;
488 #define CALLER_SAVE_R6 /* nothing */
489 #define CALLER_RESTORE_R6 /* nothing */
492 #ifdef CALLER_SAVES_R7
493 #define CALLER_SAVE_R7 SAVE_R7 = R7;
494 #define CALLER_RESTORE_R7 R7 = SAVE_R7;
496 #define CALLER_SAVE_R7 /* nothing */
497 #define CALLER_RESTORE_R7 /* nothing */
500 #ifdef CALLER_SAVES_R8
501 #define CALLER_SAVE_R8 SAVE_R8 = R8;
502 #define CALLER_RESTORE_R8 R8 = SAVE_R8;
504 #define CALLER_SAVE_R8 /* nothing */
505 #define CALLER_RESTORE_R8 /* nothing */
508 #ifdef CALLER_SAVES_R9
509 #define CALLER_SAVE_R9 SAVE_R9 = R9;
510 #define CALLER_RESTORE_R9 R9 = SAVE_R9;
512 #define CALLER_SAVE_R9 /* nothing */
513 #define CALLER_RESTORE_R9 /* nothing */
516 #ifdef CALLER_SAVES_R10
517 #define CALLER_SAVE_R10 SAVE_R10 = R10;
518 #define CALLER_RESTORE_R10 R10 = SAVE_R10;
520 #define CALLER_SAVE_R10 /* nothing */
521 #define CALLER_RESTORE_R10 /* nothing */
524 #ifdef CALLER_SAVES_F1
525 #define CALLER_SAVE_F1 SAVE_F1 = F1;
526 #define CALLER_RESTORE_F1 F1 = SAVE_F1;
528 #define CALLER_SAVE_F1 /* nothing */
529 #define CALLER_RESTORE_F1 /* nothing */
532 #ifdef CALLER_SAVES_F2
533 #define CALLER_SAVE_F2 SAVE_F2 = F2;
534 #define CALLER_RESTORE_F2 F2 = SAVE_F2;
536 #define CALLER_SAVE_F2 /* nothing */
537 #define CALLER_RESTORE_F2 /* nothing */
540 #ifdef CALLER_SAVES_F3
541 #define CALLER_SAVE_F3 SAVE_F3 = F3;
542 #define CALLER_RESTORE_F3 F3 = SAVE_F3;
544 #define CALLER_SAVE_F3 /* nothing */
545 #define CALLER_RESTORE_F3 /* nothing */
548 #ifdef CALLER_SAVES_F4
549 #define CALLER_SAVE_F4 SAVE_F4 = F4;
550 #define CALLER_RESTORE_F4 F4 = SAVE_F4;
552 #define CALLER_SAVE_F4 /* nothing */
553 #define CALLER_RESTORE_F4 /* nothing */
556 #ifdef CALLER_SAVES_D1
557 #define CALLER_SAVE_D1 SAVE_D1 = D1;
558 #define CALLER_RESTORE_D1 D1 = SAVE_D1;
560 #define CALLER_SAVE_D1 /* nothing */
561 #define CALLER_RESTORE_D1 /* nothing */
564 #ifdef CALLER_SAVES_D2
565 #define CALLER_SAVE_D2 SAVE_D2 = D2;
566 #define CALLER_RESTORE_D2 D2 = SAVE_D2;
568 #define CALLER_SAVE_D2 /* nothing */
569 #define CALLER_RESTORE_D2 /* nothing */
572 #ifdef CALLER_SAVES_L1
573 #define CALLER_SAVE_L1 SAVE_L1 = L1;
574 #define CALLER_RESTORE_L1 L1 = SAVE_L1;
576 #define CALLER_SAVE_L1 /* nothing */
577 #define CALLER_RESTORE_L1 /* nothing */
580 #ifdef CALLER_SAVES_Sp
581 #define CALLER_SAVE_Sp SAVE_Sp = Sp;
582 #define CALLER_RESTORE_Sp Sp = SAVE_Sp;
584 #define CALLER_SAVE_Sp /* nothing */
585 #define CALLER_RESTORE_Sp /* nothing */
588 #ifdef CALLER_SAVES_SpLim
589 #define CALLER_SAVE_SpLim SAVE_SpLim = SpLim;
590 #define CALLER_RESTORE_SpLim SpLim = SAVE_SpLim;
592 #define CALLER_SAVE_SpLim /* nothing */
593 #define CALLER_RESTORE_SpLim /* nothing */
596 #ifdef CALLER_SAVES_Hp
597 #define CALLER_SAVE_Hp SAVE_Hp = Hp;
598 #define CALLER_RESTORE_Hp Hp = SAVE_Hp;
600 #define CALLER_SAVE_Hp /* nothing */
601 #define CALLER_RESTORE_Hp /* nothing */
604 #ifdef CALLER_SAVES_HpLim
605 #define CALLER_SAVE_HpLim SAVE_HpLim = HpLim;
606 #define CALLER_RESTORE_HpLim HpLim = SAVE_HpLim;
608 #define CALLER_SAVE_HpLim /* nothing */
609 #define CALLER_RESTORE_HpLim /* nothing */
612 #ifdef CALLER_SAVES_Base
614 #error "Can't have caller-saved BaseReg with SMP"
616 #define CALLER_SAVE_Base /* nothing */
617 #define CALLER_RESTORE_Base BaseReg = &MainRegTable;
619 #define CALLER_SAVE_Base /* nothing */
620 #define CALLER_RESTORE_Base /* nothing */
623 #ifdef CALLER_SAVES_CurrentTSO
624 #define CALLER_SAVE_CurrentTSO SAVE_CurrentTSO = CurrentTSO;
625 #define CALLER_RESTORE_CurrentTSO CurrentTSO = SAVE_CurrentTSO;
627 #define CALLER_SAVE_CurrentTSO /* nothing */
628 #define CALLER_RESTORE_CurrentTSO /* nothing */
631 #ifdef CALLER_SAVES_CurrentNursery
632 #define CALLER_SAVE_CurrentNursery SAVE_CurrentNursery = CurrentNursery;
633 #define CALLER_RESTORE_CurrentNursery CurrentNursery = SAVE_CurrentNursery;
635 #define CALLER_SAVE_CurrentNursery /* nothing */
636 #define CALLER_RESTORE_CurrentNursery /* nothing */
639 #ifdef CALLER_SAVES_HpAlloc
640 #define CALLER_SAVE_HpAlloc SAVE_HpAlloc = HpAlloc;
641 #define CALLER_RESTORE_HpAlloc HpAlloc = SAVE_HpAlloc;
643 #define CALLER_SAVE_HpAlloc /* nothing */
644 #define CALLER_RESTORE_HpAlloc /* nothing */
647 #ifdef CALLER_SAVES_SparkHd
648 #define CALLER_SAVE_SparkHd SAVE_SparkHd = SparkHd;
649 #define CALLER_RESTORE_SparkHd SparkHd = SAVE_SparkHd;
651 #define CALLER_SAVE_SparkHd /* nothing */
652 #define CALLER_RESTORE_SparkHd /* nothing */
655 #ifdef CALLER_SAVES_SparkTl
656 #define CALLER_SAVE_SparkTl SAVE_SparkTl = SparkTl;
657 #define CALLER_RESTORE_SparkTl SparkTl = SAVE_SparkTl;
659 #define CALLER_SAVE_SparkTl /* nothing */
660 #define CALLER_RESTORE_SparkTl /* nothing */
663 #ifdef CALLER_SAVES_SparkBase
664 #define CALLER_SAVE_SparkBase SAVE_SparkBase = SparkBase;
665 #define CALLER_RESTORE_SparkBase SparkBase = SAVE_SparkBase;
667 #define CALLER_SAVE_SparkBase /* nothing */
668 #define CALLER_RESTORE_SparkBase /* nothing */
671 #ifdef CALLER_SAVES_SparkLim
672 #define CALLER_SAVE_SparkLim SAVE_SparkLim = SparkLim;
673 #define CALLER_RESTORE_SparkLim SparkLim = SAVE_SparkLim;
675 #define CALLER_SAVE_SparkLim /* nothing */
676 #define CALLER_RESTORE_SparkLim /* nothing */
679 #endif /* IN_STG_CODE */
681 /* ----------------------------------------------------------------------------
682 Handy bunches of saves/restores
683 ------------------------------------------------------------------------ */
687 #define CALLER_SAVE_USER \
704 /* Save Base last, since the others may
705 be addressed relative to it */
706 #define CALLER_SAVE_SYSTEM \
711 CALLER_SAVE_CurrentTSO \
712 CALLER_SAVE_CurrentNursery \
713 CALLER_SAVE_SparkHd \
714 CALLER_SAVE_SparkTl \
715 CALLER_SAVE_SparkBase \
716 CALLER_SAVE_SparkLim \
719 #define CALLER_RESTORE_USER \
736 /* Restore Base first, since the others may
737 be addressed relative to it */
738 #define CALLER_RESTORE_SYSTEM \
739 CALLER_RESTORE_Base \
741 CALLER_RESTORE_SpLim \
743 CALLER_RESTORE_HpLim \
744 CALLER_RESTORE_CurrentTSO \
745 CALLER_RESTORE_CurrentNursery \
746 CALLER_RESTORE_SparkHd \
747 CALLER_RESTORE_SparkTl \
748 CALLER_RESTORE_SparkBase \
749 CALLER_RESTORE_SparkLim
751 #else /* not IN_STG_CODE */
753 #define CALLER_SAVE_USER /* nothing */
754 #define CALLER_SAVE_SYSTEM /* nothing */
755 #define CALLER_RESTORE_USER /* nothing */
756 #define CALLER_RESTORE_SYSTEM /* nothing */
758 #endif /* IN_STG_CODE */
759 #define CALLER_SAVE_ALL \
763 #define CALLER_RESTORE_ALL \
764 CALLER_RESTORE_SYSTEM \