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 // If this flag is set, we are running Haskell code. Used to detect
105 // uses of 'foreign import unsafe' that should be 'safe'.
111 * Registers Hp and HpLim are global across the entire system, and are
112 * copied into the RegTable before executing a thread.
114 * Registers Sp and SpLim are saved in the TSO for the
115 * thread, but are copied into the RegTable before executing a thread.
117 * All other registers are "general purpose", and are used for passing
118 * arguments to functions, and returning values. The code generator
119 * knows how many of these are in real registers, and avoids
120 * generating code that uses non-real registers. General purpose
121 * registers are never saved when returning to the scheduler, instead
122 * we save whatever is live at the time on the stack, and restore it
123 * later. This should reduce the context switch time, amongst other
126 * For argument passing, the stack will be used in preference to
127 * pseudo-registers if the architecture has too few general purpose
130 * Some special RTS functions like newArray and the Integer primitives
131 * expect their arguments to be in registers R1-Rn, so we use these
132 * (pseudo-)registers in those cases.
136 * Locations for saving per-thread registers.
139 #define SAVE_Sp (CurrentTSO->sp)
140 #define SAVE_SpLim (CurrentTSO->splim)
142 #define SAVE_Hp (BaseReg->rHp)
143 #define SAVE_HpLim (BaseReg->rHpLim)
145 #define SAVE_CurrentTSO (BaseReg->rCurrentTSO)
146 #define SAVE_CurrentNursery (BaseReg->rCurrentNursery)
147 #define SAVE_HpAlloc (BaseReg->rHpAlloc)
148 #define SAVE_SparkHd (BaseReg->rSparks.hd)
149 #define SAVE_SparkTl (BaseReg->rSparks.tl)
150 #define SAVE_SparkBase (BaseReg->rSparks.base)
151 #define SAVE_SparkLim (BaseReg->rSparks.lim)
153 /* We sometimes need to save registers across a C-call, eg. if they
154 * are clobbered in the standard calling convention. We define the
155 * save locations for all registers in the register table.
158 #define SAVE_R1 (BaseReg->rR1)
159 #define SAVE_R2 (BaseReg->rR2)
160 #define SAVE_R3 (BaseReg->rR3)
161 #define SAVE_R4 (BaseReg->rR4)
162 #define SAVE_R5 (BaseReg->rR5)
163 #define SAVE_R6 (BaseReg->rR6)
164 #define SAVE_R7 (BaseReg->rR7)
165 #define SAVE_R8 (BaseReg->rR8)
167 #define SAVE_F1 (BaseReg->rF1)
168 #define SAVE_F2 (BaseReg->rF2)
169 #define SAVE_F3 (BaseReg->rF3)
170 #define SAVE_F4 (BaseReg->rF4)
172 #define SAVE_D1 (BaseReg->rD1)
173 #define SAVE_D2 (BaseReg->rD2)
175 #define SAVE_L1 (BaseReg->rL1)
177 /* -----------------------------------------------------------------------------
178 * Emit the GCC-specific register declarations for each machine
179 * register being used. If any STG register isn't mapped to a machine
180 * register, then map it to an offset from BaseReg.
182 * First, the general purpose registers. The idea is, if a particular
183 * general-purpose STG register can't be mapped to a real machine
184 * register, it won't be used at all. Instead, we'll use the stack.
186 * This is an improvement on the way things used to be done, when all
187 * registers were mapped to locations in the register table, and stuff
188 * was being shifted from the stack to the register table and back
189 * again for no good reason (on register-poor architectures).
192 /* define NO_REGS to omit register declarations - used in RTS C code
193 * that needs all the STG definitions but not the global register
196 #define GLOBAL_REG_DECL(type,name,reg) register type name REG(reg);
198 #if defined(REG_R1) && !defined(NO_GLOBAL_REG_DECLS)
199 GLOBAL_REG_DECL(StgUnion,R1,REG_R1)
201 # define R1 (BaseReg->rR1)
204 #if defined(REG_R2) && !defined(NO_GLOBAL_REG_DECLS)
205 GLOBAL_REG_DECL(StgUnion,R2,REG_R2)
207 # define R2 (BaseReg->rR2)
210 #if defined(REG_R3) && !defined(NO_GLOBAL_REG_DECLS)
211 GLOBAL_REG_DECL(StgUnion,R3,REG_R3)
213 # define R3 (BaseReg->rR3)
216 #if defined(REG_R4) && !defined(NO_GLOBAL_REG_DECLS)
217 GLOBAL_REG_DECL(StgUnion,R4,REG_R4)
219 # define R4 (BaseReg->rR4)
222 #if defined(REG_R5) && !defined(NO_GLOBAL_REG_DECLS)
223 GLOBAL_REG_DECL(StgUnion,R5,REG_R5)
225 # define R5 (BaseReg->rR5)
228 #if defined(REG_R6) && !defined(NO_GLOBAL_REG_DECLS)
229 GLOBAL_REG_DECL(StgUnion,R6,REG_R6)
231 # define R6 (BaseReg->rR6)
234 #if defined(REG_R7) && !defined(NO_GLOBAL_REG_DECLS)
235 GLOBAL_REG_DECL(StgUnion,R7,REG_R7)
237 # define R7 (BaseReg->rR7)
240 #if defined(REG_R8) && !defined(NO_GLOBAL_REG_DECLS)
241 GLOBAL_REG_DECL(StgUnion,R8,REG_R8)
243 # define R8 (BaseReg->rR8)
246 #if defined(REG_R9) && !defined(NO_GLOBAL_REG_DECLS)
247 GLOBAL_REG_DECL(StgUnion,R9,REG_R9)
249 # define R9 (BaseReg->rR9)
252 #if defined(REG_R10) && !defined(NO_GLOBAL_REG_DECLS)
253 GLOBAL_REG_DECL(StgUnion,R10,REG_R10)
255 # define R10 (BaseReg->rR10)
258 #if defined(REG_F1) && !defined(NO_GLOBAL_REG_DECLS)
259 GLOBAL_REG_DECL(StgFloat,F1,REG_F1)
261 #define F1 (BaseReg->rF1)
264 #if defined(REG_F2) && !defined(NO_GLOBAL_REG_DECLS)
265 GLOBAL_REG_DECL(StgFloat,F2,REG_F2)
267 #define F2 (BaseReg->rF2)
270 #if defined(REG_F3) && !defined(NO_GLOBAL_REG_DECLS)
271 GLOBAL_REG_DECL(StgFloat,F3,REG_F3)
273 #define F3 (BaseReg->rF3)
276 #if defined(REG_F4) && !defined(NO_GLOBAL_REG_DECLS)
277 GLOBAL_REG_DECL(StgFloat,F4,REG_F4)
279 #define F4 (BaseReg->rF4)
282 #if defined(REG_D1) && !defined(NO_GLOBAL_REG_DECLS)
283 GLOBAL_REG_DECL(StgDouble,D1,REG_D1)
285 #define D1 (BaseReg->rD1)
288 #if defined(REG_D2) && !defined(NO_GLOBAL_REG_DECLS)
289 GLOBAL_REG_DECL(StgDouble,D2,REG_D2)
291 #define D2 (BaseReg->rD2)
294 #if defined(REG_L1) && !defined(NO_GLOBAL_REG_DECLS)
295 GLOBAL_REG_DECL(StgWord64,L1,REG_L1)
297 #define L1 (BaseReg->rL1)
301 * If BaseReg isn't mapped to a machine register, just use the global
302 * address of the current register table (CurrentRegTable in
303 * concurrent Haskell, MainRegTable otherwise).
306 /* A capability is a combination of a FunTable and a RegTable. In STG
307 * code, BaseReg normally points to the RegTable portion of this
308 * structure, so that we can index both forwards and backwards to take
309 * advantage of shorter instruction forms on some archs (eg. x86).
310 * This is a cut-down version of the Capability structure; the full
311 * version is defined in Capability.h.
313 struct PartCapability_ {
318 /* No such thing as a MainCapability under SMP - each thread must have
319 * its own Capability.
321 #if IN_STG_CODE && !defined(SMP)
322 extern W_ MainCapability[];
325 #if defined(REG_Base) && !defined(NO_GLOBAL_REG_DECLS)
326 GLOBAL_REG_DECL(StgRegTable *,BaseReg,REG_Base)
329 #error BaseReg must be in a register for SMP
331 #define BaseReg (&((struct PartCapability_ *)MainCapability)->r)
334 #if defined(REG_Sp) && !defined(NO_GLOBAL_REG_DECLS)
335 GLOBAL_REG_DECL(P_,Sp,REG_Sp)
337 #define Sp (BaseReg->rSp)
340 #if defined(REG_SpLim) && !defined(NO_GLOBAL_REG_DECLS)
341 GLOBAL_REG_DECL(P_,SpLim,REG_SpLim)
343 #define SpLim (BaseReg->rSpLim)
346 #if defined(REG_Hp) && !defined(NO_GLOBAL_REG_DECLS)
347 GLOBAL_REG_DECL(P_,Hp,REG_Hp)
349 #define Hp (BaseReg->rHp)
352 #if defined(REG_HpLim) && !defined(NO_GLOBAL_REG_DECLS)
353 GLOBAL_REG_DECL(P_,HpLim,REG_HpLim)
355 #define HpLim (BaseReg->rHpLim)
358 #if defined(REG_CurrentTSO) && !defined(NO_GLOBAL_REG_DECLS)
359 GLOBAL_REG_DECL(struct _StgTSO *,CurrentTSO,REG_CurrentTSO)
361 #define CurrentTSO (BaseReg->rCurrentTSO)
364 #if defined(REG_CurrentNursery) && !defined(NO_GLOBAL_REG_DECLS)
365 GLOBAL_REG_DECL(bdescr *,CurrentNursery,REG_CurrentNursery)
367 #define CurrentNursery (BaseReg->rCurrentNursery)
370 #if defined(REG_HpAlloc) && !defined(NO_GLOBAL_REG_DECLS)
371 GLOBAL_REG_DECL(bdescr *,HpAlloc,REG_HpAlloc)
373 #define HpAlloc (BaseReg->rHpAlloc)
376 #if defined(REG_SparkHd) && !defined(NO_GLOBAL_REG_DECLS)
377 GLOBAL_REG_DECL(bdescr *,SparkHd,REG_SparkHd)
379 #define SparkHd (BaseReg->rSparks.hd)
382 #if defined(REG_SparkTl) && !defined(NO_GLOBAL_REG_DECLS)
383 GLOBAL_REG_DECL(bdescr *,SparkTl,REG_SparkTl)
385 #define SparkTl (BaseReg->rSparks.tl)
388 #if defined(REG_SparkBase) && !defined(NO_GLOBAL_REG_DECLS)
389 GLOBAL_REG_DECL(bdescr *,SparkBase,REG_SparkBase)
391 #define SparkBase (BaseReg->rSparks.base)
394 #if defined(REG_SparkLim) && !defined(NO_GLOBAL_REG_DECLS)
395 GLOBAL_REG_DECL(bdescr *,SparkLim,REG_SparkLim)
397 #define SparkLim (BaseReg->rSparks.lim)
400 /* -----------------------------------------------------------------------------
401 Get absolute function pointers from the register table, to save
410 as long as the offset is within the range of a signed byte
411 (-128..+127). So we pick some common absolute_addresses and put
412 them in the register table. As a bonus, linking time should also
415 Other possible candidates in order of importance:
418 stg_CAF_BLACKHOLE_info
421 anything else probably isn't worth the effort.
423 -------------------------------------------------------------------------- */
426 #define FunReg ((StgFunTable *)((void *)BaseReg - sizeof(StgFunTable)))
428 #define stg_gc_enter_1 (FunReg->stgGCEnter1)
429 #define stg_gc_fun (FunReg->stgGCFun)
431 /* -----------------------------------------------------------------------------
432 For any registers which are denoted "caller-saves" by the C calling
433 convention, we have to emit code to save and restore them across C
435 -------------------------------------------------------------------------- */
437 #ifdef CALLER_SAVES_R1
438 #define CALLER_SAVE_R1 SAVE_R1 = R1;
439 #define CALLER_RESTORE_R1 R1 = SAVE_R1;
441 #define CALLER_SAVE_R1 /* nothing */
442 #define CALLER_RESTORE_R1 /* nothing */
445 #ifdef CALLER_SAVES_R2
446 #define CALLER_SAVE_R2 SAVE_R2 = R2;
447 #define CALLER_RESTORE_R2 R2 = SAVE_R2;
449 #define CALLER_SAVE_R2 /* nothing */
450 #define CALLER_RESTORE_R2 /* nothing */
453 #ifdef CALLER_SAVES_R3
454 #define CALLER_SAVE_R3 SAVE_R3 = R3;
455 #define CALLER_RESTORE_R3 R3 = SAVE_R3;
457 #define CALLER_SAVE_R3 /* nothing */
458 #define CALLER_RESTORE_R3 /* nothing */
461 #ifdef CALLER_SAVES_R4
462 #define CALLER_SAVE_R4 SAVE_R4 = R4;
463 #define CALLER_RESTORE_R4 R4 = SAVE_R4;
465 #define CALLER_SAVE_R4 /* nothing */
466 #define CALLER_RESTORE_R4 /* nothing */
469 #ifdef CALLER_SAVES_R5
470 #define CALLER_SAVE_R5 SAVE_R5 = R5;
471 #define CALLER_RESTORE_R5 R5 = SAVE_R5;
473 #define CALLER_SAVE_R5 /* nothing */
474 #define CALLER_RESTORE_R5 /* nothing */
477 #ifdef CALLER_SAVES_R6
478 #define CALLER_SAVE_R6 SAVE_R6 = R6;
479 #define CALLER_RESTORE_R6 R6 = SAVE_R6;
481 #define CALLER_SAVE_R6 /* nothing */
482 #define CALLER_RESTORE_R6 /* nothing */
485 #ifdef CALLER_SAVES_R7
486 #define CALLER_SAVE_R7 SAVE_R7 = R7;
487 #define CALLER_RESTORE_R7 R7 = SAVE_R7;
489 #define CALLER_SAVE_R7 /* nothing */
490 #define CALLER_RESTORE_R7 /* nothing */
493 #ifdef CALLER_SAVES_R8
494 #define CALLER_SAVE_R8 SAVE_R8 = R8;
495 #define CALLER_RESTORE_R8 R8 = SAVE_R8;
497 #define CALLER_SAVE_R8 /* nothing */
498 #define CALLER_RESTORE_R8 /* nothing */
501 #ifdef CALLER_SAVES_R9
502 #define CALLER_SAVE_R9 SAVE_R9 = R9;
503 #define CALLER_RESTORE_R9 R9 = SAVE_R9;
505 #define CALLER_SAVE_R9 /* nothing */
506 #define CALLER_RESTORE_R9 /* nothing */
509 #ifdef CALLER_SAVES_R10
510 #define CALLER_SAVE_R10 SAVE_R10 = R10;
511 #define CALLER_RESTORE_R10 R10 = SAVE_R10;
513 #define CALLER_SAVE_R10 /* nothing */
514 #define CALLER_RESTORE_R10 /* nothing */
517 #ifdef CALLER_SAVES_F1
518 #define CALLER_SAVE_F1 SAVE_F1 = F1;
519 #define CALLER_RESTORE_F1 F1 = SAVE_F1;
521 #define CALLER_SAVE_F1 /* nothing */
522 #define CALLER_RESTORE_F1 /* nothing */
525 #ifdef CALLER_SAVES_F2
526 #define CALLER_SAVE_F2 SAVE_F2 = F2;
527 #define CALLER_RESTORE_F2 F2 = SAVE_F2;
529 #define CALLER_SAVE_F2 /* nothing */
530 #define CALLER_RESTORE_F2 /* nothing */
533 #ifdef CALLER_SAVES_F3
534 #define CALLER_SAVE_F3 SAVE_F3 = F3;
535 #define CALLER_RESTORE_F3 F3 = SAVE_F3;
537 #define CALLER_SAVE_F3 /* nothing */
538 #define CALLER_RESTORE_F3 /* nothing */
541 #ifdef CALLER_SAVES_F4
542 #define CALLER_SAVE_F4 SAVE_F4 = F4;
543 #define CALLER_RESTORE_F4 F4 = SAVE_F4;
545 #define CALLER_SAVE_F4 /* nothing */
546 #define CALLER_RESTORE_F4 /* nothing */
549 #ifdef CALLER_SAVES_D1
550 #define CALLER_SAVE_D1 SAVE_D1 = D1;
551 #define CALLER_RESTORE_D1 D1 = SAVE_D1;
553 #define CALLER_SAVE_D1 /* nothing */
554 #define CALLER_RESTORE_D1 /* nothing */
557 #ifdef CALLER_SAVES_D2
558 #define CALLER_SAVE_D2 SAVE_D2 = D2;
559 #define CALLER_RESTORE_D2 D2 = SAVE_D2;
561 #define CALLER_SAVE_D2 /* nothing */
562 #define CALLER_RESTORE_D2 /* nothing */
565 #ifdef CALLER_SAVES_L1
566 #define CALLER_SAVE_L1 SAVE_L1 = L1;
567 #define CALLER_RESTORE_L1 L1 = SAVE_L1;
569 #define CALLER_SAVE_L1 /* nothing */
570 #define CALLER_RESTORE_L1 /* nothing */
573 #ifdef CALLER_SAVES_Sp
574 #define CALLER_SAVE_Sp SAVE_Sp = Sp;
575 #define CALLER_RESTORE_Sp Sp = SAVE_Sp;
577 #define CALLER_SAVE_Sp /* nothing */
578 #define CALLER_RESTORE_Sp /* nothing */
581 #ifdef CALLER_SAVES_SpLim
582 #define CALLER_SAVE_SpLim SAVE_SpLim = SpLim;
583 #define CALLER_RESTORE_SpLim SpLim = SAVE_SpLim;
585 #define CALLER_SAVE_SpLim /* nothing */
586 #define CALLER_RESTORE_SpLim /* nothing */
589 #ifdef CALLER_SAVES_Hp
590 #define CALLER_SAVE_Hp SAVE_Hp = Hp;
591 #define CALLER_RESTORE_Hp Hp = SAVE_Hp;
593 #define CALLER_SAVE_Hp /* nothing */
594 #define CALLER_RESTORE_Hp /* nothing */
597 #ifdef CALLER_SAVES_HpLim
598 #define CALLER_SAVE_HpLim SAVE_HpLim = HpLim;
599 #define CALLER_RESTORE_HpLim HpLim = SAVE_HpLim;
601 #define CALLER_SAVE_HpLim /* nothing */
602 #define CALLER_RESTORE_HpLim /* nothing */
605 #ifdef CALLER_SAVES_Base
607 #error "Can't have caller-saved BaseReg with SMP"
609 #define CALLER_SAVE_Base /* nothing */
610 #define CALLER_RESTORE_Base BaseReg = &MainRegTable;
612 #define CALLER_SAVE_Base /* nothing */
613 #define CALLER_RESTORE_Base /* nothing */
616 #ifdef CALLER_SAVES_CurrentTSO
617 #define CALLER_SAVE_CurrentTSO SAVE_CurrentTSO = CurrentTSO;
618 #define CALLER_RESTORE_CurrentTSO CurrentTSO = SAVE_CurrentTSO;
620 #define CALLER_SAVE_CurrentTSO /* nothing */
621 #define CALLER_RESTORE_CurrentTSO /* nothing */
624 #ifdef CALLER_SAVES_CurrentNursery
625 #define CALLER_SAVE_CurrentNursery SAVE_CurrentNursery = CurrentNursery;
626 #define CALLER_RESTORE_CurrentNursery CurrentNursery = SAVE_CurrentNursery;
628 #define CALLER_SAVE_CurrentNursery /* nothing */
629 #define CALLER_RESTORE_CurrentNursery /* nothing */
632 #ifdef CALLER_SAVES_HpAlloc
633 #define CALLER_SAVE_HpAlloc SAVE_HpAlloc = HpAlloc;
634 #define CALLER_RESTORE_HpAlloc HpAlloc = SAVE_HpAlloc;
636 #define CALLER_SAVE_HpAlloc /* nothing */
637 #define CALLER_RESTORE_HpAlloc /* nothing */
640 #ifdef CALLER_SAVES_SparkHd
641 #define CALLER_SAVE_SparkHd SAVE_SparkHd = SparkHd;
642 #define CALLER_RESTORE_SparkHd SparkHd = SAVE_SparkHd;
644 #define CALLER_SAVE_SparkHd /* nothing */
645 #define CALLER_RESTORE_SparkHd /* nothing */
648 #ifdef CALLER_SAVES_SparkTl
649 #define CALLER_SAVE_SparkTl SAVE_SparkTl = SparkTl;
650 #define CALLER_RESTORE_SparkTl SparkTl = SAVE_SparkTl;
652 #define CALLER_SAVE_SparkTl /* nothing */
653 #define CALLER_RESTORE_SparkTl /* nothing */
656 #ifdef CALLER_SAVES_SparkBase
657 #define CALLER_SAVE_SparkBase SAVE_SparkBase = SparkBase;
658 #define CALLER_RESTORE_SparkBase SparkBase = SAVE_SparkBase;
660 #define CALLER_SAVE_SparkBase /* nothing */
661 #define CALLER_RESTORE_SparkBase /* nothing */
664 #ifdef CALLER_SAVES_SparkLim
665 #define CALLER_SAVE_SparkLim SAVE_SparkLim = SparkLim;
666 #define CALLER_RESTORE_SparkLim SparkLim = SAVE_SparkLim;
668 #define CALLER_SAVE_SparkLim /* nothing */
669 #define CALLER_RESTORE_SparkLim /* nothing */
672 #endif /* IN_STG_CODE */
674 /* ----------------------------------------------------------------------------
675 Handy bunches of saves/restores
676 ------------------------------------------------------------------------ */
680 #define CALLER_SAVE_USER \
697 /* Save Base last, since the others may
698 be addressed relative to it */
699 #define CALLER_SAVE_SYSTEM \
704 CALLER_SAVE_CurrentTSO \
705 CALLER_SAVE_CurrentNursery \
706 CALLER_SAVE_SparkHd \
707 CALLER_SAVE_SparkTl \
708 CALLER_SAVE_SparkBase \
709 CALLER_SAVE_SparkLim \
712 #define CALLER_RESTORE_USER \
729 /* Restore Base first, since the others may
730 be addressed relative to it */
731 #define CALLER_RESTORE_SYSTEM \
732 CALLER_RESTORE_Base \
734 CALLER_RESTORE_SpLim \
736 CALLER_RESTORE_HpLim \
737 CALLER_RESTORE_CurrentTSO \
738 CALLER_RESTORE_CurrentNursery \
739 CALLER_RESTORE_SparkHd \
740 CALLER_RESTORE_SparkTl \
741 CALLER_RESTORE_SparkBase \
742 CALLER_RESTORE_SparkLim
744 #else /* not IN_STG_CODE */
746 #define CALLER_SAVE_USER /* nothing */
747 #define CALLER_SAVE_SYSTEM /* nothing */
748 #define CALLER_RESTORE_USER /* nothing */
749 #define CALLER_RESTORE_SYSTEM /* nothing */
751 #endif /* IN_STG_CODE */
752 #define CALLER_SAVE_ALL \
756 #define CALLER_RESTORE_ALL \
757 CALLER_RESTORE_SYSTEM \