1 /* -----------------------------------------------------------------------------
3 * (c) The GHC Team, 1998-2003
7 * To run an STG function from C land, call
9 * rv = StgRun(f,BaseReg);
11 * where "f" is the STG function to call, and BaseReg is the address of the
12 * RegTable for this run (we might have separate RegTables if we're running
13 * multiple threads on an SMP machine).
15 * In the end, "f" must JMP to StgReturn (defined below),
16 * passing the return-value "rv" in R1,
17 * to return to the caller of StgRun returning "rv" in
18 * the whatever way C returns a value.
20 * NOTE: StgRun/StgReturn do *NOT* load or store Hp or any
21 * other registers (other than saving the C callee-saves
22 * registers). Instead, the called function "f" must do that
25 * GCC will have assumed that pushing/popping of C-stack frames is
26 * going on when it generated its code, and used stack space
27 * accordingly. However, we actually {\em post-process away} all
28 * such stack-framery (see \tr{ghc/driver/ghc-asm.lprl}). Things will
29 * be OK however, if we initially make sure there are
30 * @RESERVED_C_STACK_BYTES@ on the C-stack to begin with, for local
33 * -------------------------------------------------------------------------- */
35 #include "PosixSource.h"
39 * We define the following (unused) global register variables, because for
40 * some reason gcc generates sub-optimal code for StgRun() on the Alpha
41 * (unnecessarily saving extra registers on the stack) if we don't.
43 * Why do it at the top of this file, rather than near StgRun() below? Because
44 * gcc doesn't let us define global register variables after any function
45 * definition has been read. Any point after #include "Stg.h" would be too
48 * We define alpha_EXTRA_CAREFUL here to save $s6, $f8 and $f9 -- registers
49 * that we don't use but which are callee-save registers. The __divq() routine
50 * in libc.a clobbers $s6.
52 #include "ghcconfig.h"
53 #ifdef alpha_HOST_ARCH
54 #define alpha_EXTRA_CAREFUL
55 register long fake_ra __asm__("$26");
56 register long fake_gp __asm__("$29");
57 #ifdef alpha_EXTRA_CAREFUL
58 register long fake_s6 __asm__("$15");
59 register double fake_f8 __asm__("$f8");
60 register double fake_f9 __asm__("$f9");
64 /* include Stg.h first because we want real machine regs in here: we
65 * have to get the value of R1 back from Stg land to C land intact.
71 #include "OSThreads.h"
72 #include "Capability.h"
79 #ifdef USE_MINIINTERPRETER
81 /* -----------------------------------------------------------------------------
82 any architecture (using miniinterpreter)
83 -------------------------------------------------------------------------- */
85 StgRegTable * StgRun(StgFunPtr f, StgRegTable *basereg STG_UNUSED)
89 debugBelch("Jumping to ");
90 printPtr((P_)f); fflush(stdout);
93 f = (StgFunPtr) (f)();
95 return (StgRegTable *)R1.p;
98 StgFunPtr StgReturn(void)
103 #else /* !USE_MINIINTERPRETER */
105 #ifdef LEADING_UNDERSCORE
106 #define STG_RETURN "_StgReturn"
108 #define STG_RETURN "StgReturn"
111 /* -----------------------------------------------------------------------------
113 -------------------------------------------------------------------------- */
115 #ifdef i386_HOST_ARCH
117 #ifdef darwin_TARGET_OS
118 #define STG_GLOBAL ".globl "
120 #define STG_GLOBAL ".global "
124 StgRun(StgFunPtr f, StgRegTable *basereg) {
126 unsigned char space[ RESERVED_C_STACK_BYTES + 4*sizeof(void *) ];
131 * save callee-saves registers on behalf of the STG code.
133 "movl %%esp, %%eax\n\t"
135 "movl %%ebx,0(%%eax)\n\t"
136 "movl %%esi,4(%%eax)\n\t"
137 "movl %%edi,8(%%eax)\n\t"
138 "movl %%ebp,12(%%eax)\n\t"
144 * grab the function argument from the stack
150 * The stack pointer has to be aligned to a multiple of 16 bytes at
151 * this point. This works out correctly with gcc 4.0.1, but it might
152 * break at any time in the future. TODO: Make this future-proof.
160 STG_GLOBAL STG_RETURN "\n"
163 "movl %%esi, %%eax\n\t" /* Return value in R1 */
166 * restore callee-saves registers. (Don't stomp on %%eax!)
168 "movl %%esp, %%edx\n\t"
170 "movl 0(%%edx),%%ebx\n\t" /* restore the registers saved above */
171 "movl 4(%%edx),%%esi\n\t"
172 "movl 8(%%edx),%%edi\n\t"
173 "movl 12(%%edx),%%ebp\n\t"
175 : "=&a" (r), "=m" (space)
176 : "m" (f), "m" (basereg), "i" (RESERVED_C_STACK_BYTES)
177 : "edx" /* stomps on %edx */
185 /* ----------------------------------------------------------------------------
186 x86-64 is almost the same as plain x86.
188 I've done it using entirely inline assembler, because I couldn't
189 get gcc to generate the correct subtraction from %rsp by using
190 the local array variable trick. It didn't seem to reserve
191 enough space. Oh well, it's not much harder this way.
193 ------------------------------------------------------------------------- */
195 #ifdef x86_64_HOST_ARCH
197 extern StgRegTable * StgRun(StgFunPtr f, StgRegTable *basereg);
199 static void GNUC3_ATTRIBUTE(used)
200 StgRunIsImplementedInAssembler(void)
204 * save callee-saves registers on behalf of the STG code.
209 "movq %%rsp, %%rax\n\t"
210 "addq %0-48, %%rax\n\t"
211 "movq %%rbx,0(%%rax)\n\t"
212 "movq %%rbp,8(%%rax)\n\t"
213 "movq %%r12,16(%%rax)\n\t"
214 "movq %%r13,24(%%rax)\n\t"
215 "movq %%r14,32(%%rax)\n\t"
216 "movq %%r15,40(%%rax)\n\t"
220 "movq %%rsi,%%r13\n\t"
222 * grab the function argument from the stack, and jump to it.
224 "movq %%rdi,%%rax\n\t"
227 ".global " STG_RETURN "\n"
230 "movq %%rbx, %%rax\n\t" /* Return value in R1 */
233 * restore callee-saves registers. (Don't stomp on %%rax!)
235 "movq %%rsp, %%rdx\n\t"
236 "addq %0-48, %%rdx\n\t"
237 "movq 0(%%rdx),%%rbx\n\t" /* restore the registers saved above */
238 "movq 8(%%rdx),%%rbp\n\t"
239 "movq 16(%%rdx),%%r12\n\t"
240 "movq 24(%%rdx),%%r13\n\t"
241 "movq 32(%%rdx),%%r14\n\t"
242 "movq 40(%%rdx),%%r15\n\t"
246 : : "i"(RESERVED_C_STACK_BYTES+48+8 /*stack frame size*/));
250 The x86_64 ABI specifies that on a procedure call, %rsp is
251 aligned on a 16-byte boundary + 8. That is, the first
252 argument on the stack after the return address will be
255 Which should be fine: RESERVED_C_STACK_BYTES+48 is a multiple
258 BUT... when we do a C-call from STG land, gcc likes to put the
259 stack alignment adjustment in the prolog. eg. if we're calling
260 a function with arguments in regs, gcc will insert 'subq $8,%rsp'
261 in the prolog, to keep %rsp aligned (the return address is 8
262 bytes, remember). The mangler throws away the prolog, so we
263 lose the stack alignment.
265 The hack is to add this extra 8 bytes to our %rsp adjustment
266 here, so that throughout STG code, %rsp is 16-byte aligned,
269 A quick way to see if this is wrong is to compile this code:
271 main = System.Exit.exitWith ExitSuccess
273 And run it with +RTS -sstderr. The stats code in the RTS, in
274 particular statsPrintf(), relies on the stack alignment because
275 it saves the %xmm regs on the stack, so it'll fall over if the
276 stack isn't aligned, and calling exitWith from Haskell invokes
277 shutdownHaskellAndExit using a C call.
279 Future gcc releases will almost certainly break this hack...
285 /* -----------------------------------------------------------------------------
289 OLD COMMENT from GHC-3.02:
291 We want tailjumps to be calls, because `call xxx' is the only Sparc
292 branch that allows an arbitrary label as a target. (Gcc's ``goto
293 *target'' construct ends up loading the label into a register and
294 then jumping, at the cost of two extra instructions for the 32-bit
297 When entering the threaded world, we stash our return address in a
298 known location so that \tr{%i7} is available as an extra
299 callee-saves register. Of course, we have to restore this when
300 coming out of the threaded world.
302 I hate this god-forsaken architecture. Since the top of the
303 reserved stack space is used for globals and the bottom is reserved
304 for outgoing arguments, we have to stick our return address
305 somewhere in the middle. Currently, I'm allowing 100 extra
306 outgoing arguments beyond the first 6. --JSM
308 Updated info (GHC 4.06): we don't appear to use %i7 any more, so
309 I'm not sure whether we still need to save it. Incedentally, what
310 does the last paragraph above mean when it says "the top of the
311 stack is used for globals"? What globals? --SDM
313 Updated info (GHC 4.08.2): not saving %i7 any more (see below).
314 -------------------------------------------------------------------------- */
316 #ifdef sparc_HOST_ARCH
319 StgRun(StgFunPtr f, StgRegTable *basereg) {
321 unsigned char space[RESERVED_C_STACK_BYTES];
323 register void *i7 __asm__("%i7");
324 ((void **)(space))[100] = i7;
329 ".global " STG_RETURN "\n"
331 : : : "l0","l1","l2","l3","l4","l5","l6","l7");
332 /* we tell the C compiler that l0-l7 are clobbered on return to
333 * StgReturn, otherwise it tries to use these to save eg. the
334 * address of space[100] across the call. The correct thing
335 * to do would be to save all the callee-saves regs, but we
336 * can't be bothered to do that.
338 * The code that gcc generates for this little fragment is now
339 * terrible. We could do much better by coding it directly in
343 /* updated 4.08.2: we don't save %i7 in the middle of the reserved
344 * space any more, since gcc tries to save its address across the
345 * call to f(), this gets clobbered in STG land and we end up
346 * dereferencing a bogus pointer in StgReturn.
348 __asm__ volatile ("ld %1,%0"
349 : "=r" (i7) : "m" (((void **)(space))[100]));
351 return (StgRegTable *)R1.i;
356 /* -----------------------------------------------------------------------------
359 "The stack pointer (SP) must at all times denote an address that has octaword
360 alignment. (This restriction has the side effect that the in-memory portion
361 of the argument list, if any, will start on an octaword boundary.) Note that
362 the stack grows toward lower addresses. During a procedure invocation, SP
363 can never be set to a value that is higher than the value of SP at entry to
364 that procedure invocation.
366 "The contents of the stack, located above the portion of the argument list
367 (if any) that is passed in memory, belong to the calling procedure. Because
368 they are part of the calling procedure, they should not be read or written
369 by the called procedure, except as specified by indirect arguments or
370 language-controlled up-level references.
372 "The SP value might be used by the hardware when raising exceptions and
373 asynchronous interrupts. It must be assumed that the contents of the stack
374 below the current SP value and within the stack for the current thread are
375 continually and unpredictably modified, as specified in the _Alpha
376 Architecture Reference Manual_, and as a result of asynchronous software
379 -- Compaq Computer Corporation, Houston. Tru64 UNIX Calling Standard for
380 Alpha Systems, 5.1 edition, August 2000, section 3.2.1. http://www.
381 tru64unix.compaq.com/docs/base_doc/DOCUMENTATION/V51_PDF/ARH9MBTE.PDF
382 -------------------------------------------------------------------------- */
384 #ifdef alpha_HOST_ARCH
387 StgRun(StgFunPtr f, StgRegTable *basereg)
389 register long real_ra __asm__("$26"); volatile long save_ra;
390 register long real_gp __asm__("$29"); volatile long save_gp;
392 register long real_s0 __asm__("$9" ); volatile long save_s0;
393 register long real_s1 __asm__("$10"); volatile long save_s1;
394 register long real_s2 __asm__("$11"); volatile long save_s2;
395 register long real_s3 __asm__("$12"); volatile long save_s3;
396 register long real_s4 __asm__("$13"); volatile long save_s4;
397 register long real_s5 __asm__("$14"); volatile long save_s5;
398 #ifdef alpha_EXTRA_CAREFUL
399 register long real_s6 __asm__("$15"); volatile long save_s6;
402 register double real_f2 __asm__("$f2"); volatile double save_f2;
403 register double real_f3 __asm__("$f3"); volatile double save_f3;
404 register double real_f4 __asm__("$f4"); volatile double save_f4;
405 register double real_f5 __asm__("$f5"); volatile double save_f5;
406 register double real_f6 __asm__("$f6"); volatile double save_f6;
407 register double real_f7 __asm__("$f7"); volatile double save_f7;
408 #ifdef alpha_EXTRA_CAREFUL
409 register double real_f8 __asm__("$f8"); volatile double save_f8;
410 register double real_f9 __asm__("$f9"); volatile double save_f9;
413 register StgFunPtr real_pv __asm__("$27");
426 #ifdef alpha_EXTRA_CAREFUL
436 #ifdef alpha_EXTRA_CAREFUL
443 __asm__ volatile( "lda $30,-%0($30)" "\n"
444 "\t" "jmp ($27)" "\n"
446 ".globl " STG_RETURN "\n"
448 "\t" "lda $30,%0($30)" "\n"
449 : : "K" (RESERVED_C_STACK_BYTES));
459 #ifdef alpha_EXTRA_CAREFUL
469 #ifdef alpha_EXTRA_CAREFUL
480 #endif /* alpha_HOST_ARCH */
482 /* -----------------------------------------------------------------------------
484 -------------------------------------------------------------------------- */
486 #ifdef hppa1_1_HOST_ARCH
489 StgRun(StgFunPtr f, StgRegTable *basereg)
491 StgChar space[RESERVED_C_STACK_BYTES+16*sizeof(long)+10*sizeof(double)];
494 __asm__ volatile ("ldo %0(%%r30),%%r19\n"
495 "\tstw %%r3, 0(0,%%r19)\n"
496 "\tstw %%r4, 4(0,%%r19)\n"
497 "\tstw %%r5, 8(0,%%r19)\n"
498 "\tstw %%r6,12(0,%%r19)\n"
499 "\tstw %%r7,16(0,%%r19)\n"
500 "\tstw %%r8,20(0,%%r19)\n"
501 "\tstw %%r9,24(0,%%r19)\n"
502 "\tstw %%r10,28(0,%%r19)\n"
503 "\tstw %%r11,32(0,%%r19)\n"
504 "\tstw %%r12,36(0,%%r19)\n"
505 "\tstw %%r13,40(0,%%r19)\n"
506 "\tstw %%r14,44(0,%%r19)\n"
507 "\tstw %%r15,48(0,%%r19)\n"
508 "\tstw %%r16,52(0,%%r19)\n"
509 "\tstw %%r17,56(0,%%r19)\n"
510 "\tstw %%r18,60(0,%%r19)\n"
511 "\tldo 80(%%r19),%%r19\n"
512 "\tfstds %%fr12,-16(0,%%r19)\n"
513 "\tfstds %%fr13, -8(0,%%r19)\n"
514 "\tfstds %%fr14, 0(0,%%r19)\n"
515 "\tfstds %%fr15, 8(0,%%r19)\n"
516 "\tldo 32(%%r19),%%r19\n"
517 "\tfstds %%fr16,-16(0,%%r19)\n"
518 "\tfstds %%fr17, -8(0,%%r19)\n"
519 "\tfstds %%fr18, 0(0,%%r19)\n"
520 "\tfstds %%fr19, 8(0,%%r19)\n"
521 "\tldo 32(%%r19),%%r19\n"
522 "\tfstds %%fr20,-16(0,%%r19)\n"
523 "\tfstds %%fr21, -8(0,%%r19)\n" : :
524 "n" (-(116 * sizeof(long) + 10 * sizeof(double))) : "%r19"
529 __asm__ volatile (".align 4\n"
530 "\t.EXPORT " STG_RETURN ",CODE\n"
531 "\t.EXPORT " STG_RETURN ",ENTRY,PRIV_LEV=3\n"
533 /* "\tldo %0(%%r3),%%r19\n" */
534 "\tldo %1(%%r30),%%r19\n"
535 "\tcopy %%r11, %0\n" /* save R1 */
536 "\tldw 0(0,%%r19),%%r3\n"
537 "\tldw 4(0,%%r19),%%r4\n"
538 "\tldw 8(0,%%r19),%%r5\n"
539 "\tldw 12(0,%%r19),%%r6\n"
540 "\tldw 16(0,%%r19),%%r7\n"
541 "\tldw 20(0,%%r19),%%r8\n"
542 "\tldw 24(0,%%r19),%%r9\n"
543 "\tldw 28(0,%%r19),%%r10\n"
544 "\tldw 32(0,%%r19),%%r11\n"
545 "\tldw 36(0,%%r19),%%r12\n"
546 "\tldw 40(0,%%r19),%%r13\n"
547 "\tldw 44(0,%%r19),%%r14\n"
548 "\tldw 48(0,%%r19),%%r15\n"
549 "\tldw 52(0,%%r19),%%r16\n"
550 "\tldw 56(0,%%r19),%%r17\n"
551 "\tldw 60(0,%%r19),%%r18\n"
552 "\tldo 80(%%r19),%%r19\n"
553 "\tfldds -16(0,%%r19),%%fr12\n"
554 "\tfldds -8(0,%%r19),%%fr13\n"
555 "\tfldds 0(0,%%r19),%%fr14\n"
556 "\tfldds 8(0,%%r19),%%fr15\n"
557 "\tldo 32(%%r19),%%r19\n"
558 "\tfldds -16(0,%%r19),%%fr16\n"
559 "\tfldds -8(0,%%r19),%%fr17\n"
560 "\tfldds 0(0,%%r19),%%fr18\n"
561 "\tfldds 8(0,%%r19),%%fr19\n"
562 "\tldo 32(%%r19),%%r19\n"
563 "\tfldds -16(0,%%r19),%%fr20\n"
564 "\tfldds -8(0,%%r19),%%fr21\n"
566 : "n" (-(116 * sizeof(long) + 10 * sizeof(double)))
573 #endif /* hppa1_1_HOST_ARCH */
575 /* -----------------------------------------------------------------------------
578 Everything is in assembler, so we don't have to deal with GCC...
580 -------------------------------------------------------------------------- */
582 #ifdef powerpc_HOST_ARCH
584 extern StgRegTable * StgRun(StgFunPtr f, StgRegTable *basereg);
586 #ifdef darwin_HOST_OS
587 void StgRunIsImplementedInAssembler(void)
589 #if HAVE_SUBSECTIONS_VIA_SYMBOLS
590 // if the toolchain supports deadstripping, we have to
591 // prevent it here (it tends to get confused here).
592 __asm__ volatile (".no_dead_strip _StgRunIsImplementedInAssembler");
598 "\tbl saveFP # f14\n"
599 "\tstmw r13,-220(r1)\n"
600 "\tstwu r1,-%0(r1)\n"
601 "\tmr r27,r4\n" // BaseReg == r27
605 ".globl _StgReturn\n"
609 "\tlmw r13,-220(r1)\n"
611 : : "i"(RESERVED_C_STACK_BYTES+224 /*stack frame size*/));
615 // This version is for PowerPC Linux.
617 // Differences from the Darwin/Mac OS X version:
618 // *) Different Assembler Syntax
619 // *) Doesn't use Register Saving Helper Functions (although they exist somewhere)
620 // *) We may not access positive stack offsets
621 // (no "Red Zone" as in the Darwin ABI)
622 // *) The Link Register is saved to a different offset in the caller's stack frame
623 // (Linux: 4(r1), Darwin 8(r1))
625 static void GNUC3_ATTRIBUTE(used)
626 StgRunIsImplementedInAssembler(void)
630 "\t.type StgRun,@function\n"
636 "\tstmw 13,-220(5)\n"
637 "\tstfd 14,-144(5)\n"
638 "\tstfd 15,-136(5)\n"
639 "\tstfd 16,-128(5)\n"
640 "\tstfd 17,-120(5)\n"
641 "\tstfd 18,-112(5)\n"
642 "\tstfd 19,-104(5)\n"
655 "\tmr 27,4\n" // BaseReg == r27
660 "\t.type StgReturn,@function\n"
687 : : "i"(RESERVED_C_STACK_BYTES+224 /*stack frame size*/));
693 /* -----------------------------------------------------------------------------
694 PowerPC 64 architecture
696 Everything is in assembler, so we don't have to deal with GCC...
698 -------------------------------------------------------------------------- */
700 #ifdef powerpc64_HOST_ARCH
703 extern StgRegTable * StgRun(StgFunPtr f, StgRegTable *basereg);
705 static void GNUC3_ATTRIBUTE(used)
706 StgRunIsImplementedInAssembler(void)
710 // r2 toc - needs to be saved
711 // r3-r10 argument passing, volatile
712 // r11, r12 very volatile (not saved across cross-module calls)
713 // r13 thread local state (never modified, don't need to save)
714 // r14-r31 callee-save
716 ".section \".opd\",\"aw\"\n"
720 "\t.quad\t.StgRun,.TOC.@tocbase,0\n"
721 "\t.size StgRun,24\n"
724 "\t.quad\t.StgReturn,.TOC.@tocbase,0\n"
725 "\t.size StgReturn,24\n"
728 ".type .StgRun,@function\n"
735 "\tstd 14, -288(5)\n"
736 "\tstd 15, -280(5)\n"
737 "\tstd 16, -272(5)\n"
738 "\tstd 17, -264(5)\n"
739 "\tstd 18, -256(5)\n"
740 "\tstd 19, -248(5)\n"
741 "\tstd 20, -240(5)\n"
742 "\tstd 21, -232(5)\n"
743 "\tstd 22, -224(5)\n"
744 "\tstd 23, -216(5)\n"
745 "\tstd 24, -208(5)\n"
746 "\tstd 25, -200(5)\n"
747 "\tstd 26, -192(5)\n"
748 "\tstd 27, -184(5)\n"
749 "\tstd 28, -176(5)\n"
750 "\tstd 29, -168(5)\n"
751 "\tstd 30, -160(5)\n"
752 "\tstd 31, -152(5)\n"
753 "\tstfd 14, -144(5)\n"
754 "\tstfd 15, -136(5)\n"
755 "\tstfd 16, -128(5)\n"
756 "\tstfd 17, -120(5)\n"
757 "\tstfd 18, -112(5)\n"
758 "\tstfd 19, -104(5)\n"
759 "\tstfd 20, -96(5)\n"
760 "\tstfd 21, -88(5)\n"
761 "\tstfd 22, -80(5)\n"
762 "\tstfd 23, -72(5)\n"
763 "\tstfd 24, -64(5)\n"
764 "\tstfd 25, -56(5)\n"
765 "\tstfd 26, -48(5)\n"
766 "\tstfd 27, -40(5)\n"
767 "\tstfd 28, -32(5)\n"
768 "\tstfd 29, -24(5)\n"
769 "\tstfd 30, -16(5)\n"
771 "\tmr 27, 4\n" // BaseReg == r27
776 ".globl .StgReturn\n"
777 ".type .StgReturn,@function\n"
780 "\tla 5, %0(1)\n" // load address == addi r5, r1, %0
800 "\tlfd 14, -144(5)\n"
801 "\tlfd 15, -136(5)\n"
802 "\tlfd 16, -128(5)\n"
803 "\tlfd 17, -120(5)\n"
804 "\tlfd 18, -112(5)\n"
805 "\tlfd 19, -104(5)\n"
822 : : "i"(RESERVED_C_STACK_BYTES+304 /*stack frame size*/));
824 #else // linux_HOST_OS
825 #error Only linux support for power64 right now.
830 /* -----------------------------------------------------------------------------
833 Again, in assembler - so we can fiddle with the register stack, and because
834 gcc doesn't handle asm-clobbered callee-saves correctly.
836 loc0 - loc15: preserved locals
837 loc16 - loc28: STG registers
840 loc31: saved gp (gcc 3.3 uses this slot)
841 -------------------------------------------------------------------------- */
843 #ifdef ia64_HOST_ARCH
845 /* the memory stack is rarely used, so 16K is excessive */
846 #undef RESERVED_C_STACK_BYTES
847 #define RESERVED_C_STACK_BYTES 1024
849 #if ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 3)) || (__GNUC__ > 3)
850 /* gcc 3.3+: leave an extra slot for gp saves */
856 static void GNUC3_ATTRIBUTE(used)
857 StgRunIsImplementedInAssembler(void)
862 "\talloc loc29 = ar.pfs, 0, %1, 8, 0\n" /* setup register frame */
863 "\tld8 r18 = [r32],8\n" /* get procedure address */
864 "\tadds sp = -%0, sp ;;\n" /* setup stack */
865 "\tld8 gp = [r32]\n" /* get procedure GP */
866 "\tadds r16 = %0-(6*16), sp\n"
867 "\tadds r17 = %0-(5*16), sp ;;\n"
868 "\tstf.spill [r16] = f16,32\n" /* spill callee-saved fp regs */
869 "\tstf.spill [r17] = f17,32\n"
870 "\tmov b6 = r18 ;;\n" /* set target address */
871 "\tstf.spill [r16] = f18,32\n"
872 "\tstf.spill [r17] = f19,32\n"
873 "\tmov loc30 = b0 ;;\n" /* save return address */
874 "\tstf.spill [r16] = f20,32\n"
875 "\tstf.spill [r17] = f21,32\n"
876 "\tbr.few b6 ;;\n" /* branch to function */
877 ".global StgReturn\n"
879 "\tmov r8 = loc16\n" /* return value in r8 */
880 "\tadds r16 = %0-(6*16), sp\n"
881 "\tadds r17 = %0-(5*16), sp ;;\n"
882 "\tldf.fill f16 = [r16],32\n" /* start restoring fp regs */
883 "\tldf.fill f17 = [r17],32\n"
884 "\tmov ar.pfs = loc29 ;;\n" /* restore register frame */
885 "\tldf.fill f18 = [r16],32\n"
886 "\tldf.fill f19 = [r17],32\n"
887 "\tmov b0 = loc30 ;;\n" /* restore return address */
888 "\tldf.fill f20 = [r16],32\n"
889 "\tldf.fill f21 = [r17],32\n"
890 "\tadds sp = %0, sp\n" /* restore stack */
891 "\tbr.ret.sptk.many b0 ;;\n" /* return */
892 : : "i"(RESERVED_C_STACK_BYTES + 6*16), "i"(LOCALS));
897 #endif /* !USE_MINIINTERPRETER */