/* * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers * Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved. * * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED * OR IMPLIED. ANY USE IS AT YOUR OWN RISK. * * Permission is hereby granted to use or copy this program * for any purpose, provided the above notices are retained on all copies. * Permission to modify the code and to distribute modified code is granted, * provided the above notices are retained, and a notice that the code was * modified is included with the above copyright notice. */ /* Boehm, November 17, 1995 12:13 pm PST */ # include "private/gc_priv.h" # include <stdio.h> # include <setjmp.h> # if defined(OS2) || defined(CX_UX) # define _setjmp(b) setjmp(b) # define _longjmp(b,v) longjmp(b,v) # endif # ifdef AMIGA # ifndef __GNUC__ # include <dos.h> # else # include <machine/reg.h> # endif # endif #if defined(__MWERKS__) && !defined(POWERPC) asm static void PushMacRegisters() { sub.w #4,sp // reserve space for one parameter. move.l a2,(sp) jsr GC_push_one move.l a3,(sp) jsr GC_push_one move.l a4,(sp) jsr GC_push_one # if !__option(a6frames) // <pcb> perhaps a6 should be pushed if stack frames are not being used. move.l a6,(sp) jsr GC_push_one # endif // skip a5 (globals), a6 (frame pointer), and a7 (stack pointer) move.l d2,(sp) jsr GC_push_one move.l d3,(sp) jsr GC_push_one move.l d4,(sp) jsr GC_push_one move.l d5,(sp) jsr GC_push_one move.l d6,(sp) jsr GC_push_one move.l d7,(sp) jsr GC_push_one add.w #4,sp // fix stack. rts } #endif /* __MWERKS__ */ # if defined(SPARC) || defined(IA64) /* Value returned from register flushing routine; either sp (SPARC) */ /* or ar.bsp (IA64) */ word GC_save_regs_ret_val; # endif /* Routine to mark from registers that are preserved by the C compiler. */ /* This must be ported to every new architecture. There is a generic */ /* version at the end, that is likely, but not guaranteed to work */ /* on your architecture. Run the test_setjmp program to see whether */ /* there is any chance it will work. */ #ifndef USE_GENERIC_PUSH_REGS void GC_push_regs() { # ifdef RT register long TMP_SP; /* must be bound to r11 */ # endif # if defined(MIPS) && defined(LINUX) /* I'm not sure whether this has actually been tested. */ # define call_push(x) asm("move $4," x ";"); asm("jal GC_push_one") call_push("$2"); call_push("$3"); call_push("$16"); call_push("$17"); call_push("$18"); call_push("$19"); call_push("$20"); call_push("$21"); call_push("$22"); call_push("$23"); call_push("$30"); # undef call_push # endif /* MIPS && LINUX */ # ifdef VAX /* VAX - generic code below does not work under 4.2 */ /* r1 through r5 are caller save, and therefore */ /* on the stack or dead. */ asm("pushl r11"); asm("calls $1,_GC_push_one"); asm("pushl r10"); asm("calls $1,_GC_push_one"); asm("pushl r9"); asm("calls $1,_GC_push_one"); asm("pushl r8"); asm("calls $1,_GC_push_one"); asm("pushl r7"); asm("calls $1,_GC_push_one"); asm("pushl r6"); asm("calls $1,_GC_push_one"); # endif # if defined(M68K) && (defined(SUNOS4) || defined(NEXT)) /* M68K SUNOS - could be replaced by generic code */ /* a0, a1 and d1 are caller save */ /* and therefore are on stack or dead. */ asm("subqw #0x4,sp"); /* allocate word on top of stack */ asm("movl a2,sp@"); asm("jbsr _GC_push_one"); asm("movl a3,sp@"); asm("jbsr _GC_push_one"); asm("movl a4,sp@"); asm("jbsr _GC_push_one"); asm("movl a5,sp@"); asm("jbsr _GC_push_one"); /* Skip frame pointer and stack pointer */ asm("movl d1,sp@"); asm("jbsr _GC_push_one"); asm("movl d2,sp@"); asm("jbsr _GC_push_one"); asm("movl d3,sp@"); asm("jbsr _GC_push_one"); asm("movl d4,sp@"); asm("jbsr _GC_push_one"); asm("movl d5,sp@"); asm("jbsr _GC_push_one"); asm("movl d6,sp@"); asm("jbsr _GC_push_one"); asm("movl d7,sp@"); asm("jbsr _GC_push_one"); asm("addqw #0x4,sp"); /* put stack back where it was */ # endif # if defined(M68K) && defined(HP) /* M68K HP - could be replaced by generic code */ /* a0, a1 and d1 are caller save. */ asm("subq.w &0x4,%sp"); /* allocate word on top of stack */ asm("mov.l %a2,(%sp)"); asm("jsr _GC_push_one"); asm("mov.l %a3,(%sp)"); asm("jsr _GC_push_one"); asm("mov.l %a4,(%sp)"); asm("jsr _GC_push_one"); asm("mov.l %a5,(%sp)"); asm("jsr _GC_push_one"); /* Skip frame pointer and stack pointer */ asm("mov.l %d1,(%sp)"); asm("jsr _GC_push_one"); asm("mov.l %d2,(%sp)"); asm("jsr _GC_push_one"); asm("mov.l %d3,(%sp)"); asm("jsr _GC_push_one"); asm("mov.l %d4,(%sp)"); asm("jsr _GC_push_one"); asm("mov.l %d5,(%sp)"); asm("jsr _GC_push_one"); asm("mov.l %d6,(%sp)"); asm("jsr _GC_push_one"); asm("mov.l %d7,(%sp)"); asm("jsr _GC_push_one"); asm("addq.w &0x4,%sp"); /* put stack back where it was */ # endif /* M68K HP */ # if defined(M68K) && defined(AMIGA) /* AMIGA - could be replaced by generic code */ /* a0, a1, d0 and d1 are caller save */ # ifdef __GNUC__ asm("subq.w &0x4,%sp"); /* allocate word on top of stack */ asm("mov.l %a2,(%sp)"); asm("jsr _GC_push_one"); asm("mov.l %a3,(%sp)"); asm("jsr _GC_push_one"); asm("mov.l %a4,(%sp)"); asm("jsr _GC_push_one"); asm("mov.l %a5,(%sp)"); asm("jsr _GC_push_one"); asm("mov.l %a6,(%sp)"); asm("jsr _GC_push_one"); /* Skip frame pointer and stack pointer */ asm("mov.l %d2,(%sp)"); asm("jsr _GC_push_one"); asm("mov.l %d3,(%sp)"); asm("jsr _GC_push_one"); asm("mov.l %d4,(%sp)"); asm("jsr _GC_push_one"); asm("mov.l %d5,(%sp)"); asm("jsr _GC_push_one"); asm("mov.l %d6,(%sp)"); asm("jsr _GC_push_one"); asm("mov.l %d7,(%sp)"); asm("jsr _GC_push_one"); asm("addq.w &0x4,%sp"); /* put stack back where it was */ # else /* !__GNUC__ */ GC_push_one(getreg(REG_A2)); GC_push_one(getreg(REG_A3)); # ifndef __SASC /* Can probably be changed to #if 0 -Kjetil M. (a4=globals)*/ GC_push_one(getreg(REG_A4)); # endif GC_push_one(getreg(REG_A5)); GC_push_one(getreg(REG_A6)); /* Skip stack pointer */ GC_push_one(getreg(REG_D2)); GC_push_one(getreg(REG_D3)); GC_push_one(getreg(REG_D4)); GC_push_one(getreg(REG_D5)); GC_push_one(getreg(REG_D6)); GC_push_one(getreg(REG_D7)); # endif /* !__GNUC__ */ # endif /* AMIGA */ # if defined(M68K) && defined(MACOS) # if defined(THINK_C) # define PushMacReg(reg) \ move.l reg,(sp) \ jsr GC_push_one asm { sub.w #4,sp ; reserve space for one parameter. PushMacReg(a2); PushMacReg(a3); PushMacReg(a4); ; skip a5 (globals), a6 (frame pointer), and a7 (stack pointer) PushMacReg(d2); PushMacReg(d3); PushMacReg(d4); PushMacReg(d5); PushMacReg(d6); PushMacReg(d7); add.w #4,sp ; fix stack. } # undef PushMacReg # endif /* THINK_C */ # if defined(__MWERKS__) PushMacRegisters(); # endif /* __MWERKS__ */ # endif /* MACOS */ # if defined(I386) &&!defined(OS2) &&!defined(SVR4) \ && (defined(__MINGW32__) || !defined(MSWIN32)) \ && !defined(SCO) && !defined(SCO_ELF) \ && !(defined(LINUX) && defined(__ELF__)) \ && !(defined(FREEBSD) && defined(__ELF__)) \ && !(defined(NETBSD) && defined(__ELF__)) \ && !(defined(OPENBSD) && defined(__ELF__)) \ && !(defined(BEOS) && defined(__ELF__)) \ && !defined(DOS4GW) && !defined(HURD) /* I386 code, generic code does not appear to work */ /* It does appear to work under OS2, and asms dont */ /* This is used for some 38g UNIX variants and for CYGWIN32 */ asm("pushl %eax"); asm("call _GC_push_one"); asm("addl $4,%esp"); asm("pushl %ecx"); asm("call _GC_push_one"); asm("addl $4,%esp"); asm("pushl %edx"); asm("call _GC_push_one"); asm("addl $4,%esp"); asm("pushl %ebp"); asm("call _GC_push_one"); asm("addl $4,%esp"); asm("pushl %esi"); asm("call _GC_push_one"); asm("addl $4,%esp"); asm("pushl %edi"); asm("call _GC_push_one"); asm("addl $4,%esp"); asm("pushl %ebx"); asm("call _GC_push_one"); asm("addl $4,%esp"); # endif # if ( defined(I386) && defined(LINUX) && defined(__ELF__) ) \ || ( defined(I386) && defined(FREEBSD) && defined(__ELF__) ) \ || ( defined(I386) && defined(NETBSD) && defined(__ELF__) ) \ || ( defined(I386) && defined(OPENBSD) && defined(__ELF__) ) \ || ( defined(I386) && defined(HURD) && defined(__ELF__) ) /* This is modified for Linux with ELF (Note: _ELF_ only) */ /* This section handles FreeBSD with ELF. */ /* Eax is caller-save and dead here. Other caller-save */ /* registers could also be skipped. We assume there are no */ /* pointers in MMX registers, etc. */ /* We combine instructions in a single asm to prevent gcc from */ /* inserting code in the middle. */ asm("pushl %ecx; call GC_push_one; addl $4,%esp"); asm("pushl %edx; call GC_push_one; addl $4,%esp"); asm("pushl %ebp; call GC_push_one; addl $4,%esp"); asm("pushl %esi; call GC_push_one; addl $4,%esp"); asm("pushl %edi; call GC_push_one; addl $4,%esp"); asm("pushl %ebx; call GC_push_one; addl $4,%esp"); # endif # if ( defined(I386) && defined(BEOS) && defined(__ELF__) ) /* As far as I can understand from */ /* http://www.beunited.org/articles/jbq/nasm.shtml, */ /* only ebp, esi, edi and ebx are not scratch. How MMX */ /* etc. registers should be treated, I have no idea. */ asm("pushl %ebp; call GC_push_one; addl $4,%esp"); asm("pushl %esi; call GC_push_one; addl $4,%esp"); asm("pushl %edi; call GC_push_one; addl $4,%esp"); asm("pushl %ebx; call GC_push_one; addl $4,%esp"); # endif # if defined(I386) && defined(MSWIN32) && !defined(__MINGW32__) \ && !defined(USE_GENERIC) /* I386 code, Microsoft variant */ __asm push eax __asm call GC_push_one __asm add esp,4 __asm push ebx __asm call GC_push_one __asm add esp,4 __asm push ecx __asm call GC_push_one __asm add esp,4 __asm push edx __asm call GC_push_one __asm add esp,4 __asm push ebp __asm call GC_push_one __asm add esp,4 __asm push esi __asm call GC_push_one __asm add esp,4 __asm push edi __asm call GC_push_one __asm add esp,4 # endif # if defined(I386) && (defined(SVR4) || defined(SCO) || defined(SCO_ELF)) /* I386 code, SVR4 variant, generic code does not appear to work */ asm("pushl %eax"); asm("call GC_push_one"); asm("addl $4,%esp"); asm("pushl %ebx"); asm("call GC_push_one"); asm("addl $4,%esp"); asm("pushl %ecx"); asm("call GC_push_one"); asm("addl $4,%esp"); asm("pushl %edx"); asm("call GC_push_one"); asm("addl $4,%esp"); asm("pushl %ebp"); asm("call GC_push_one"); asm("addl $4,%esp"); asm("pushl %esi"); asm("call GC_push_one"); asm("addl $4,%esp"); asm("pushl %edi"); asm("call GC_push_one"); asm("addl $4,%esp"); # endif # ifdef NS32K asm ("movd r3, tos"); asm ("bsr ?_GC_push_one"); asm ("adjspb $-4"); asm ("movd r4, tos"); asm ("bsr ?_GC_push_one"); asm ("adjspb $-4"); asm ("movd r5, tos"); asm ("bsr ?_GC_push_one"); asm ("adjspb $-4"); asm ("movd r6, tos"); asm ("bsr ?_GC_push_one"); asm ("adjspb $-4"); asm ("movd r7, tos"); asm ("bsr ?_GC_push_one"); asm ("adjspb $-4"); # endif # if defined(SPARC) { word GC_save_regs_in_stack(); GC_save_regs_ret_val = GC_save_regs_in_stack(); } # endif # ifdef RT GC_push_one(TMP_SP); /* GC_push_one from r11 */ asm("cas r11, r6, r0"); GC_push_one(TMP_SP); /* r6 */ asm("cas r11, r7, r0"); GC_push_one(TMP_SP); /* through */ asm("cas r11, r8, r0"); GC_push_one(TMP_SP); /* r10 */ asm("cas r11, r9, r0"); GC_push_one(TMP_SP); asm("cas r11, r10, r0"); GC_push_one(TMP_SP); asm("cas r11, r12, r0"); GC_push_one(TMP_SP); /* r12 */ asm("cas r11, r13, r0"); GC_push_one(TMP_SP); /* through */ asm("cas r11, r14, r0"); GC_push_one(TMP_SP); /* r15 */ asm("cas r11, r15, r0"); GC_push_one(TMP_SP); # endif # if defined(M68K) && defined(SYSV) /* Once again similar to SUN and HP, though setjmp appears to work. --Parag */ # ifdef __GNUC__ asm("subqw #0x4,%sp"); /* allocate word on top of stack */ asm("movl %a2,%sp@"); asm("jbsr GC_push_one"); asm("movl %a3,%sp@"); asm("jbsr GC_push_one"); asm("movl %a4,%sp@"); asm("jbsr GC_push_one"); asm("movl %a5,%sp@"); asm("jbsr GC_push_one"); /* Skip frame pointer and stack pointer */ asm("movl %d1,%sp@"); asm("jbsr GC_push_one"); asm("movl %d2,%sp@"); asm("jbsr GC_push_one"); asm("movl %d3,%sp@"); asm("jbsr GC_push_one"); asm("movl %d4,%sp@"); asm("jbsr GC_push_one"); asm("movl %d5,%sp@"); asm("jbsr GC_push_one"); asm("movl %d6,%sp@"); asm("jbsr GC_push_one"); asm("movl %d7,%sp@"); asm("jbsr GC_push_one"); asm("addqw #0x4,%sp"); /* put stack back where it was */ # else /* !__GNUC__*/ asm("subq.w &0x4,%sp"); /* allocate word on top of stack */ asm("mov.l %a2,(%sp)"); asm("jsr GC_push_one"); asm("mov.l %a3,(%sp)"); asm("jsr GC_push_one"); asm("mov.l %a4,(%sp)"); asm("jsr GC_push_one"); asm("mov.l %a5,(%sp)"); asm("jsr GC_push_one"); /* Skip frame pointer and stack pointer */ asm("mov.l %d1,(%sp)"); asm("jsr GC_push_one"); asm("mov.l %d2,(%sp)"); asm("jsr GC_push_one"); asm("mov.l %d3,(%sp)"); asm("jsr GC_push_one"); asm("mov.l %d4,(%sp)"); asm("jsr GC_push_one"); asm("mov.l %d5,(%sp)"); asm("jsr GC_push_one"); asm("mov.l %d6,(%sp)"); asm("jsr GC_push_one"); asm("mov.l %d7,(%sp)"); asm("jsr GC_push_one"); asm("addq.w &0x4,%sp"); /* put stack back where it was */ # endif /* !__GNUC__ */ # endif /* M68K/SYSV */ # if defined(PJ) { register int * sp asm ("optop"); extern int *__libc_stack_end; GC_push_all_stack (sp, __libc_stack_end); } # endif /* other machines... */ # if !defined(M68K) && !defined(VAX) && !defined(RT) # if !defined(SPARC) && !defined(I386) && !defined(NS32K) # if !defined(POWERPC) && !defined(UTS4) # if !defined(PJ) && !(defined(MIPS) && defined(LINUX)) --> bad news <-- # endif # endif # endif # endif } #endif /* !USE_GENERIC_PUSH_REGS */ #if defined(USE_GENERIC_PUSH_REGS) void GC_generic_push_regs(cold_gc_frame) ptr_t cold_gc_frame; { { # ifdef HAVE_BUILTIN_UNWIND_INIT /* This was suggested by Richard Henderson as the way to */ /* force callee-save registers and register windows onto */ /* the stack. */ __builtin_unwind_init(); # else /* !HAVE_BUILTIN_UNWIND_INIT */ /* Generic code */ /* The idea is due to Parag Patel at HP. */ /* We're not sure whether he would like */ /* to be he acknowledged for it or not. */ jmp_buf regs; register word * i = (word *) regs; register ptr_t lim = (ptr_t)(regs) + (sizeof regs); /* Setjmp doesn't always clear all of the buffer. */ /* That tends to preserve garbage. Clear it. */ for (; (char *)i < lim; i++) { *i = 0; } # if defined(POWERPC) || defined(MSWIN32) || defined(MSWINCE) \ || defined(UTS4) || defined(LINUX) (void) setjmp(regs); # else (void) _setjmp(regs); # endif # endif /* !HAVE_BUILTIN_UNWIND_INIT */ # if (defined(SPARC) && !defined(HAVE_BUILTIN_UNWIND_INIT)) \ || defined(IA64) /* On a register window machine, we need to save register */ /* contents on the stack for this to work. The setjmp */ /* is probably not needed on SPARC, since pointers are */ /* only stored in windowed or scratch registers. It is */ /* needed on IA64, since some non-windowed registers are */ /* preserved. */ { word GC_save_regs_in_stack(); GC_save_regs_ret_val = GC_save_regs_in_stack(); /* On IA64 gcc, could use __builtin_ia64_flushrs() and */ /* __builtin_ia64_flushrs(). The latter will be done */ /* implicitly by __builtin_unwind_init() for gcc3.0.1 */ /* and later. */ } # endif GC_push_current_stack(cold_gc_frame); } } #endif /* USE_GENERIC_PUSH_REGS */ /* On register window machines, we need a way to force registers into */ /* the stack. Return sp. */ # ifdef SPARC asm(" .seg \"text\""); # ifdef SVR4 asm(" .globl GC_save_regs_in_stack"); asm("GC_save_regs_in_stack:"); asm(" .type GC_save_regs_in_stack,#function"); # else asm(" .globl _GC_save_regs_in_stack"); asm("_GC_save_regs_in_stack:"); # endif # if defined(__arch64__) || defined(__sparcv9) asm(" save %sp,-128,%sp"); asm(" flushw"); asm(" ret"); asm(" restore %sp,2047+128,%o0"); # else asm(" ta 0x3 ! ST_FLUSH_WINDOWS"); asm(" retl"); asm(" mov %sp,%o0"); # endif # ifdef SVR4 asm(" .GC_save_regs_in_stack_end:"); asm(" .size GC_save_regs_in_stack,.GC_save_regs_in_stack_end-GC_save_regs_in_stack"); # endif # ifdef LINT word GC_save_regs_in_stack() { return(0 /* sp really */);} # endif # endif /* On IA64, we also need to flush register windows. But they end */ /* up on the other side of the stack segment. */ /* Returns the backing store pointer for the register stack. */ # ifdef IA64 # ifdef __GNUC__ asm(" .text"); asm(" .psr abi64"); asm(" .psr lsb"); asm(" .lsb"); asm(""); asm(" .text"); asm(" .align 16"); asm(" .global GC_save_regs_in_stack"); asm(" .proc GC_save_regs_in_stack"); asm("GC_save_regs_in_stack:"); asm(" .body"); asm(" flushrs"); asm(" ;;"); asm(" mov r8=ar.bsp"); asm(" br.ret.sptk.few rp"); asm(" .endp GC_save_regs_in_stack"); # else void GC_save_regs_in_stack() { asm(" flushrs"); asm(" ;;"); asm(" mov r8=ar.bsp"); asm(" br.ret.sptk.few rp"); } # endif # endif /* GC_clear_stack_inner(arg, limit) clears stack area up to limit and */ /* returns arg. Stack clearing is crucial on SPARC, so we supply */ /* an assembly version that's more careful. Assumes limit is hotter */ /* than sp, and limit is 8 byte aligned. */ #if defined(ASM_CLEAR_CODE) #ifndef SPARC --> fix it #endif # ifdef SUNOS4 asm(".globl _GC_clear_stack_inner"); asm("_GC_clear_stack_inner:"); # else asm(".globl GC_clear_stack_inner"); asm("GC_clear_stack_inner:"); asm(".type GC_save_regs_in_stack,#function"); # endif #if defined(__arch64__) || defined(__sparcv9) asm("mov %sp,%o2"); /* Save sp */ asm("add %sp,2047-8,%o3"); /* p = sp+bias-8 */ asm("add %o1,-2047-192,%sp"); /* Move sp out of the way, */ /* so that traps still work. */ /* Includes some extra words */ /* so we can be sloppy below. */ asm("loop:"); asm("stx %g0,[%o3]"); /* *(long *)p = 0 */ asm("cmp %o3,%o1"); asm("bgu,pt %xcc, loop"); /* if (p > limit) goto loop */ asm("add %o3,-8,%o3"); /* p -= 8 (delay slot) */ asm("retl"); asm("mov %o2,%sp"); /* Restore sp., delay slot */ #else asm("mov %sp,%o2"); /* Save sp */ asm("add %sp,-8,%o3"); /* p = sp-8 */ asm("clr %g1"); /* [g0,g1] = 0 */ asm("add %o1,-0x60,%sp"); /* Move sp out of the way, */ /* so that traps still work. */ /* Includes some extra words */ /* so we can be sloppy below. */ asm("loop:"); asm("std %g0,[%o3]"); /* *(long long *)p = 0 */ asm("cmp %o3,%o1"); asm("bgu loop "); /* if (p > limit) goto loop */ asm("add %o3,-8,%o3"); /* p -= 8 (delay slot) */ asm("retl"); asm("mov %o2,%sp"); /* Restore sp., delay slot */ #endif /* old SPARC */ /* First argument = %o0 = return value */ # ifdef SVR4 asm(" .GC_clear_stack_inner_end:"); asm(" .size GC_clear_stack_inner,.GC_clear_stack_inner_end-GC_clear_stack_inner"); # endif # ifdef LINT /*ARGSUSED*/ ptr_t GC_clear_stack_inner(arg, limit) ptr_t arg; word limit; { return(arg); } # endif #endif