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 * ---------------------------------------------------------------------------*/
27 * This is the table that holds shadow-locations for all the STG
28 * registers. The shadow locations are used when:
30 * 1) the particular register isn't mapped to a real machine
31 * register, probably because there's a shortage of real registers.
32 * 2) caller-saves registers are saved across a CCall
35 typedef struct StgSparkPool_ {
43 StgFunPtr stgGCEnter1;
48 * Vanilla registers are given this union type, which is purely so
49 * that we can cast the vanilla reg to a variety of types with the
50 * minimum of syntax. eg. R1.w instead of (StgWord)R1.
61 StgStackOffset offset; /* unused? */
66 typedef struct StgRegTable_ {
75 StgUnion rR9; /* used occasionally by heap/stack checks */
76 StgUnion rR10; /* used occasionally by heap/stack checks */
88 struct StgTSO_ *rCurrentTSO;
89 struct step_ *rNursery;
90 struct bdescr_ *rCurrentNursery;
91 StgWord rHpAlloc; /* number of *bytes* being allocated in heap */
92 #if defined(SMP) || defined(PAR)
93 StgSparkPool rSparks; /* per-task spark pool */
95 StgWord rInHaskell; /* non-zero if we're in Haskell code */
96 // If this flag is set, we are running Haskell code. Used to detect
97 // uses of 'foreign import unsafe' that should be 'safe'.
101 /* A capability is a combination of a FunTable and a RegTable. In STG
102 * code, BaseReg normally points to the RegTable portion of this
103 * structure, so that we can index both forwards and backwards to take
104 * advantage of shorter instruction forms on some archs (eg. x86).
106 typedef struct Capability_ {
110 struct Capability_ *link; /* per-task register tables are linked together */
114 /* No such thing as a MainCapability under SMP - each thread must have
115 * its own Capability.
119 extern W_ MainCapability[];
121 extern DLL_IMPORT_RTS Capability MainCapability;
128 * Registers Hp and HpLim are global across the entire system, and are
129 * copied into the RegTable before executing a thread.
131 * Registers Sp and SpLim are saved in the TSO for the
132 * thread, but are copied into the RegTable before executing a thread.
134 * All other registers are "general purpose", and are used for passing
135 * arguments to functions, and returning values. The code generator
136 * knows how many of these are in real registers, and avoids
137 * generating code that uses non-real registers. General purpose
138 * registers are never saved when returning to the scheduler, instead
139 * we save whatever is live at the time on the stack, and restore it
140 * later. This should reduce the context switch time, amongst other
143 * For argument passing, the stack will be used in preference to
144 * pseudo-registers if the architecture has too few general purpose
147 * Some special RTS functions like newArray and the Integer primitives
148 * expect their arguments to be in registers R1-Rn, so we use these
149 * (pseudo-)registers in those cases.
153 * Locations for saving per-thread registers.
156 #define SAVE_Sp (CurrentTSO->sp)
157 #define SAVE_SpLim (CurrentTSO->splim)
159 #define SAVE_Hp (BaseReg->rHp)
160 #define SAVE_HpLim (BaseReg->rHpLim)
162 #define SAVE_CurrentTSO (BaseReg->rCurrentTSO)
163 #define SAVE_CurrentNursery (BaseReg->rCurrentNursery)
164 #define SAVE_HpAlloc (BaseReg->rHpAlloc)
165 #define SAVE_SparkHd (BaseReg->rSparks.hd)
166 #define SAVE_SparkTl (BaseReg->rSparks.tl)
167 #define SAVE_SparkBase (BaseReg->rSparks.base)
168 #define SAVE_SparkLim (BaseReg->rSparks.lim)
170 /* We sometimes need to save registers across a C-call, eg. if they
171 * are clobbered in the standard calling convention. We define the
172 * save locations for all registers in the register table.
175 #define SAVE_R1 (BaseReg->rR1)
176 #define SAVE_R2 (BaseReg->rR2)
177 #define SAVE_R3 (BaseReg->rR3)
178 #define SAVE_R4 (BaseReg->rR4)
179 #define SAVE_R5 (BaseReg->rR5)
180 #define SAVE_R6 (BaseReg->rR6)
181 #define SAVE_R7 (BaseReg->rR7)
182 #define SAVE_R8 (BaseReg->rR8)
184 #define SAVE_F1 (BaseReg->rF1)
185 #define SAVE_F2 (BaseReg->rF2)
186 #define SAVE_F3 (BaseReg->rF3)
187 #define SAVE_F4 (BaseReg->rF4)
189 #define SAVE_D1 (BaseReg->rD1)
190 #define SAVE_D2 (BaseReg->rD2)
192 #define SAVE_L1 (BaseReg->rL1)
194 /* -----------------------------------------------------------------------------
195 * Emit the GCC-specific register declarations for each machine
196 * register being used. If any STG register isn't mapped to a machine
197 * register, then map it to an offset from BaseReg.
199 * First, the general purpose registers. The idea is, if a particular
200 * general-purpose STG register can't be mapped to a real machine
201 * register, it won't be used at all. Instead, we'll use the stack.
203 * This is an improvement on the way things used to be done, when all
204 * registers were mapped to locations in the register table, and stuff
205 * was being shifted from the stack to the register table and back
206 * again for no good reason (on register-poor architectures).
209 /* define NO_REGS to omit register declarations - used in RTS C code
210 * that needs all the STG definitions but not the global register
213 #define GLOBAL_REG_DECL(type,name,reg) register type name REG(reg);
215 #if defined(REG_R1) && !defined(NO_GLOBAL_REG_DECLS)
216 GLOBAL_REG_DECL(StgUnion,R1,REG_R1)
218 # define R1 (BaseReg->rR1)
221 #if defined(REG_R2) && !defined(NO_GLOBAL_REG_DECLS)
222 GLOBAL_REG_DECL(StgUnion,R2,REG_R2)
224 # define R2 (BaseReg->rR2)
227 #if defined(REG_R3) && !defined(NO_GLOBAL_REG_DECLS)
228 GLOBAL_REG_DECL(StgUnion,R3,REG_R3)
230 # define R3 (BaseReg->rR3)
233 #if defined(REG_R4) && !defined(NO_GLOBAL_REG_DECLS)
234 GLOBAL_REG_DECL(StgUnion,R4,REG_R4)
236 # define R4 (BaseReg->rR4)
239 #if defined(REG_R5) && !defined(NO_GLOBAL_REG_DECLS)
240 GLOBAL_REG_DECL(StgUnion,R5,REG_R5)
242 # define R5 (BaseReg->rR5)
245 #if defined(REG_R6) && !defined(NO_GLOBAL_REG_DECLS)
246 GLOBAL_REG_DECL(StgUnion,R6,REG_R6)
248 # define R6 (BaseReg->rR6)
251 #if defined(REG_R7) && !defined(NO_GLOBAL_REG_DECLS)
252 GLOBAL_REG_DECL(StgUnion,R7,REG_R7)
254 # define R7 (BaseReg->rR7)
257 #if defined(REG_R8) && !defined(NO_GLOBAL_REG_DECLS)
258 GLOBAL_REG_DECL(StgUnion,R8,REG_R8)
260 # define R8 (BaseReg->rR8)
263 #if defined(REG_R9) && !defined(NO_GLOBAL_REG_DECLS)
264 GLOBAL_REG_DECL(StgUnion,R9,REG_R9)
266 # define R9 (BaseReg->rR9)
269 #if defined(REG_R10) && !defined(NO_GLOBAL_REG_DECLS)
270 GLOBAL_REG_DECL(StgUnion,R10,REG_R10)
272 # define R10 (BaseReg->rR10)
275 #if defined(REG_F1) && !defined(NO_GLOBAL_REG_DECLS)
276 GLOBAL_REG_DECL(StgFloat,F1,REG_F1)
278 #define F1 (BaseReg->rF1)
281 #if defined(REG_F2) && !defined(NO_GLOBAL_REG_DECLS)
282 GLOBAL_REG_DECL(StgFloat,F2,REG_F2)
284 #define F2 (BaseReg->rF2)
287 #if defined(REG_F3) && !defined(NO_GLOBAL_REG_DECLS)
288 GLOBAL_REG_DECL(StgFloat,F3,REG_F3)
290 #define F3 (BaseReg->rF3)
293 #if defined(REG_F4) && !defined(NO_GLOBAL_REG_DECLS)
294 GLOBAL_REG_DECL(StgFloat,F4,REG_F4)
296 #define F4 (BaseReg->rF4)
299 #if defined(REG_D1) && !defined(NO_GLOBAL_REG_DECLS)
300 GLOBAL_REG_DECL(StgDouble,D1,REG_D1)
302 #define D1 (BaseReg->rD1)
305 #if defined(REG_D2) && !defined(NO_GLOBAL_REG_DECLS)
306 GLOBAL_REG_DECL(StgDouble,D2,REG_D2)
308 #define D2 (BaseReg->rD2)
311 #if defined(REG_L1) && !defined(NO_GLOBAL_REG_DECLS)
312 GLOBAL_REG_DECL(StgWord64,L1,REG_L1)
314 #define L1 (BaseReg->rL1)
318 * If BaseReg isn't mapped to a machine register, just use the global
319 * address of the current register table (CurrentRegTable in
320 * concurrent Haskell, MainRegTable otherwise).
323 #if defined(REG_Base) && !defined(NO_GLOBAL_REG_DECLS)
324 GLOBAL_REG_DECL(StgRegTable *,BaseReg,REG_Base)
327 #error BaseReg must be in a register for SMP
329 #define BaseReg (&((Capability *)MainCapability)[0].r)
332 #if defined(REG_Sp) && !defined(NO_GLOBAL_REG_DECLS)
333 GLOBAL_REG_DECL(P_,Sp,REG_Sp)
335 #define Sp (BaseReg->rSp)
338 #if defined(REG_SpLim) && !defined(NO_GLOBAL_REG_DECLS)
339 GLOBAL_REG_DECL(P_,SpLim,REG_SpLim)
341 #define SpLim (BaseReg->rSpLim)
344 #if defined(REG_Hp) && !defined(NO_GLOBAL_REG_DECLS)
345 GLOBAL_REG_DECL(P_,Hp,REG_Hp)
347 #define Hp (BaseReg->rHp)
350 #if defined(REG_HpLim) && !defined(NO_GLOBAL_REG_DECLS)
351 GLOBAL_REG_DECL(P_,HpLim,REG_HpLim)
353 #define HpLim (BaseReg->rHpLim)
356 #if defined(REG_CurrentTSO) && !defined(NO_GLOBAL_REG_DECLS)
357 GLOBAL_REG_DECL(struct _StgTSO *,CurrentTSO,REG_CurrentTSO)
359 #define CurrentTSO (BaseReg->rCurrentTSO)
362 #if defined(REG_CurrentNursery) && !defined(NO_GLOBAL_REG_DECLS)
363 GLOBAL_REG_DECL(bdescr *,CurrentNursery,REG_CurrentNursery)
365 #define CurrentNursery (BaseReg->rCurrentNursery)
368 #if defined(REG_HpAlloc) && !defined(NO_GLOBAL_REG_DECLS)
369 GLOBAL_REG_DECL(bdescr *,HpAlloc,REG_HpAlloc)
371 #define HpAlloc (BaseReg->rHpAlloc)
374 #if defined(REG_SparkHd) && !defined(NO_GLOBAL_REG_DECLS)
375 GLOBAL_REG_DECL(bdescr *,SparkHd,REG_SparkHd)
377 #define SparkHd (BaseReg->rSparks.hd)
380 #if defined(REG_SparkTl) && !defined(NO_GLOBAL_REG_DECLS)
381 GLOBAL_REG_DECL(bdescr *,SparkTl,REG_SparkTl)
383 #define SparkTl (BaseReg->rSparks.tl)
386 #if defined(REG_SparkBase) && !defined(NO_GLOBAL_REG_DECLS)
387 GLOBAL_REG_DECL(bdescr *,SparkBase,REG_SparkBase)
389 #define SparkBase (BaseReg->rSparks.base)
392 #if defined(REG_SparkLim) && !defined(NO_GLOBAL_REG_DECLS)
393 GLOBAL_REG_DECL(bdescr *,SparkLim,REG_SparkLim)
395 #define SparkLim (BaseReg->rSparks.lim)
398 /* -----------------------------------------------------------------------------
399 Get absolute function pointers from the register table, to save
408 as long as the offset is within the range of a signed byte
409 (-128..+127). So we pick some common absolute_addresses and put
410 them in the register table. As a bonus, linking time should also
413 Other possible candidates in order of importance:
416 stg_CAF_BLACKHOLE_info
419 anything else probably isn't worth the effort.
421 -------------------------------------------------------------------------- */
424 #define FunReg ((StgFunTable *)((void *)BaseReg - sizeof(StgFunTable)))
426 #define stg_gc_enter_1 (FunReg->stgGCEnter1)
427 #define stg_gc_fun (FunReg->stgGCFun)
429 /* -----------------------------------------------------------------------------
430 For any registers which are denoted "caller-saves" by the C calling
431 convention, we have to emit code to save and restore them across C
433 -------------------------------------------------------------------------- */
435 #ifdef CALLER_SAVES_R1
436 #define CALLER_SAVE_R1 SAVE_R1 = R1;
437 #define CALLER_RESTORE_R1 R1 = SAVE_R1;
439 #define CALLER_SAVE_R1 /* nothing */
440 #define CALLER_RESTORE_R1 /* nothing */
443 #ifdef CALLER_SAVES_R2
444 #define CALLER_SAVE_R2 SAVE_R2 = R2;
445 #define CALLER_RESTORE_R2 R2 = SAVE_R2;
447 #define CALLER_SAVE_R2 /* nothing */
448 #define CALLER_RESTORE_R2 /* nothing */
451 #ifdef CALLER_SAVES_R3
452 #define CALLER_SAVE_R3 SAVE_R3 = R3;
453 #define CALLER_RESTORE_R3 R3 = SAVE_R3;
455 #define CALLER_SAVE_R3 /* nothing */
456 #define CALLER_RESTORE_R3 /* nothing */
459 #ifdef CALLER_SAVES_R4
460 #define CALLER_SAVE_R4 SAVE_R4 = R4;
461 #define CALLER_RESTORE_R4 R4 = SAVE_R4;
463 #define CALLER_SAVE_R4 /* nothing */
464 #define CALLER_RESTORE_R4 /* nothing */
467 #ifdef CALLER_SAVES_R5
468 #define CALLER_SAVE_R5 SAVE_R5 = R5;
469 #define CALLER_RESTORE_R5 R5 = SAVE_R5;
471 #define CALLER_SAVE_R5 /* nothing */
472 #define CALLER_RESTORE_R5 /* nothing */
475 #ifdef CALLER_SAVES_R6
476 #define CALLER_SAVE_R6 SAVE_R6 = R6;
477 #define CALLER_RESTORE_R6 R6 = SAVE_R6;
479 #define CALLER_SAVE_R6 /* nothing */
480 #define CALLER_RESTORE_R6 /* nothing */
483 #ifdef CALLER_SAVES_R7
484 #define CALLER_SAVE_R7 SAVE_R7 = R7;
485 #define CALLER_RESTORE_R7 R7 = SAVE_R7;
487 #define CALLER_SAVE_R7 /* nothing */
488 #define CALLER_RESTORE_R7 /* nothing */
491 #ifdef CALLER_SAVES_R8
492 #define CALLER_SAVE_R8 SAVE_R8 = R8;
493 #define CALLER_RESTORE_R8 R8 = SAVE_R8;
495 #define CALLER_SAVE_R8 /* nothing */
496 #define CALLER_RESTORE_R8 /* nothing */
499 #ifdef CALLER_SAVES_R9
500 #define CALLER_SAVE_R9 SAVE_R9 = R9;
501 #define CALLER_RESTORE_R9 R9 = SAVE_R9;
503 #define CALLER_SAVE_R9 /* nothing */
504 #define CALLER_RESTORE_R9 /* nothing */
507 #ifdef CALLER_SAVES_R10
508 #define CALLER_SAVE_R10 SAVE_R10 = R10;
509 #define CALLER_RESTORE_R10 R10 = SAVE_R10;
511 #define CALLER_SAVE_R10 /* nothing */
512 #define CALLER_RESTORE_R10 /* nothing */
515 #ifdef CALLER_SAVES_F1
516 #define CALLER_SAVE_F1 SAVE_F1 = F1;
517 #define CALLER_RESTORE_F1 F1 = SAVE_F1;
519 #define CALLER_SAVE_F1 /* nothing */
520 #define CALLER_RESTORE_F1 /* nothing */
523 #ifdef CALLER_SAVES_F2
524 #define CALLER_SAVE_F2 SAVE_F2 = F2;
525 #define CALLER_RESTORE_F2 F2 = SAVE_F2;
527 #define CALLER_SAVE_F2 /* nothing */
528 #define CALLER_RESTORE_F2 /* nothing */
531 #ifdef CALLER_SAVES_F3
532 #define CALLER_SAVE_F3 SAVE_F3 = F3;
533 #define CALLER_RESTORE_F3 F3 = SAVE_F3;
535 #define CALLER_SAVE_F3 /* nothing */
536 #define CALLER_RESTORE_F3 /* nothing */
539 #ifdef CALLER_SAVES_F4
540 #define CALLER_SAVE_F4 SAVE_F4 = F4;
541 #define CALLER_RESTORE_F4 F4 = SAVE_F4;
543 #define CALLER_SAVE_F4 /* nothing */
544 #define CALLER_RESTORE_F4 /* nothing */
547 #ifdef CALLER_SAVES_D1
548 #define CALLER_SAVE_D1 SAVE_D1 = D1;
549 #define CALLER_RESTORE_D1 D1 = SAVE_D1;
551 #define CALLER_SAVE_D1 /* nothing */
552 #define CALLER_RESTORE_D1 /* nothing */
555 #ifdef CALLER_SAVES_D2
556 #define CALLER_SAVE_D2 SAVE_D2 = D2;
557 #define CALLER_RESTORE_D2 D2 = SAVE_D2;
559 #define CALLER_SAVE_D2 /* nothing */
560 #define CALLER_RESTORE_D2 /* nothing */
563 #ifdef CALLER_SAVES_L1
564 #define CALLER_SAVE_L1 SAVE_L1 = L1;
565 #define CALLER_RESTORE_L1 L1 = SAVE_L1;
567 #define CALLER_SAVE_L1 /* nothing */
568 #define CALLER_RESTORE_L1 /* nothing */
571 #ifdef CALLER_SAVES_Sp
572 #define CALLER_SAVE_Sp SAVE_Sp = Sp;
573 #define CALLER_RESTORE_Sp Sp = SAVE_Sp;
575 #define CALLER_SAVE_Sp /* nothing */
576 #define CALLER_RESTORE_Sp /* nothing */
579 #ifdef CALLER_SAVES_SpLim
580 #define CALLER_SAVE_SpLim SAVE_SpLim = SpLim;
581 #define CALLER_RESTORE_SpLim SpLim = SAVE_SpLim;
583 #define CALLER_SAVE_SpLim /* nothing */
584 #define CALLER_RESTORE_SpLim /* nothing */
587 #ifdef CALLER_SAVES_Hp
588 #define CALLER_SAVE_Hp SAVE_Hp = Hp;
589 #define CALLER_RESTORE_Hp Hp = SAVE_Hp;
591 #define CALLER_SAVE_Hp /* nothing */
592 #define CALLER_RESTORE_Hp /* nothing */
595 #ifdef CALLER_SAVES_HpLim
596 #define CALLER_SAVE_HpLim SAVE_HpLim = HpLim;
597 #define CALLER_RESTORE_HpLim HpLim = SAVE_HpLim;
599 #define CALLER_SAVE_HpLim /* nothing */
600 #define CALLER_RESTORE_HpLim /* nothing */
603 #ifdef CALLER_SAVES_Base
605 #error "Can't have caller-saved BaseReg with SMP"
607 #define CALLER_SAVE_Base /* nothing */
608 #define CALLER_RESTORE_Base BaseReg = &MainRegTable;
610 #define CALLER_SAVE_Base /* nothing */
611 #define CALLER_RESTORE_Base /* nothing */
614 #ifdef CALLER_SAVES_CurrentTSO
615 #define CALLER_SAVE_CurrentTSO SAVE_CurrentTSO = CurrentTSO;
616 #define CALLER_RESTORE_CurrentTSO CurrentTSO = SAVE_CurrentTSO;
618 #define CALLER_SAVE_CurrentTSO /* nothing */
619 #define CALLER_RESTORE_CurrentTSO /* nothing */
622 #ifdef CALLER_SAVES_CurrentNursery
623 #define CALLER_SAVE_CurrentNursery SAVE_CurrentNursery = CurrentNursery;
624 #define CALLER_RESTORE_CurrentNursery CurrentNursery = SAVE_CurrentNursery;
626 #define CALLER_SAVE_CurrentNursery /* nothing */
627 #define CALLER_RESTORE_CurrentNursery /* nothing */
630 #ifdef CALLER_SAVES_HpAlloc
631 #define CALLER_SAVE_HpAlloc SAVE_HpAlloc = HpAlloc;
632 #define CALLER_RESTORE_HpAlloc HpAlloc = SAVE_HpAlloc;
634 #define CALLER_SAVE_HpAlloc /* nothing */
635 #define CALLER_RESTORE_HpAlloc /* nothing */
638 #ifdef CALLER_SAVES_SparkHd
639 #define CALLER_SAVE_SparkHd SAVE_SparkHd = SparkHd;
640 #define CALLER_RESTORE_SparkHd SparkHd = SAVE_SparkHd;
642 #define CALLER_SAVE_SparkHd /* nothing */
643 #define CALLER_RESTORE_SparkHd /* nothing */
646 #ifdef CALLER_SAVES_SparkTl
647 #define CALLER_SAVE_SparkTl SAVE_SparkTl = SparkTl;
648 #define CALLER_RESTORE_SparkTl SparkTl = SAVE_SparkTl;
650 #define CALLER_SAVE_SparkTl /* nothing */
651 #define CALLER_RESTORE_SparkTl /* nothing */
654 #ifdef CALLER_SAVES_SparkBase
655 #define CALLER_SAVE_SparkBase SAVE_SparkBase = SparkBase;
656 #define CALLER_RESTORE_SparkBase SparkBase = SAVE_SparkBase;
658 #define CALLER_SAVE_SparkBase /* nothing */
659 #define CALLER_RESTORE_SparkBase /* nothing */
662 #ifdef CALLER_SAVES_SparkLim
663 #define CALLER_SAVE_SparkLim SAVE_SparkLim = SparkLim;
664 #define CALLER_RESTORE_SparkLim SparkLim = SAVE_SparkLim;
666 #define CALLER_SAVE_SparkLim /* nothing */
667 #define CALLER_RESTORE_SparkLim /* nothing */
670 #endif /* IN_STG_CODE */
672 /* ----------------------------------------------------------------------------
673 Handy bunches of saves/restores
674 ------------------------------------------------------------------------ */
678 #define CALLER_SAVE_USER \
695 /* Save Base last, since the others may
696 be addressed relative to it */
697 #define CALLER_SAVE_SYSTEM \
702 CALLER_SAVE_CurrentTSO \
703 CALLER_SAVE_CurrentNursery \
704 CALLER_SAVE_SparkHd \
705 CALLER_SAVE_SparkTl \
706 CALLER_SAVE_SparkBase \
707 CALLER_SAVE_SparkLim \
710 #define CALLER_RESTORE_USER \
727 /* Restore Base first, since the others may
728 be addressed relative to it */
729 #define CALLER_RESTORE_SYSTEM \
730 CALLER_RESTORE_Base \
732 CALLER_RESTORE_SpLim \
734 CALLER_RESTORE_HpLim \
735 CALLER_RESTORE_CurrentTSO \
736 CALLER_RESTORE_CurrentNursery \
737 CALLER_RESTORE_SparkHd \
738 CALLER_RESTORE_SparkTl \
739 CALLER_RESTORE_SparkBase \
740 CALLER_RESTORE_SparkLim
742 #else /* not IN_STG_CODE */
744 #define CALLER_SAVE_USER /* nothing */
745 #define CALLER_SAVE_SYSTEM /* nothing */
746 #define CALLER_RESTORE_USER /* nothing */
747 #define CALLER_RESTORE_SYSTEM /* nothing */
749 #endif /* IN_STG_CODE */
750 #define CALLER_SAVE_ALL \
754 #define CALLER_RESTORE_ALL \
755 CALLER_RESTORE_SYSTEM \