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/*
* 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.
*/
#include "private/gc_priv.h"
#include <stdio.h>
#include <setjmp.h>
#if defined(OS2) || defined(CX_UX) || defined(__CC_ARM)
# 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). */
GC_INNER ptr_t GC_save_regs_ret_val = NULL;
# endif
/* Routine to mark from registers that are preserved by the C compiler. */
/* This must be ported to every new architecture. It is not optional, */
/* and should not be used on platforms that are either UNIX-like, or */
/* require thread support. */
#undef HAVE_PUSH_REGS
#if defined(USE_ASM_PUSH_REGS)
# define HAVE_PUSH_REGS
#else /* No asm implementation */
# if defined(M68K) && defined(AMIGA)
/* This function is not static because it could also be */
/* errorneously defined in .S file, so this error would be caught */
/* by the linker. */
void GC_push_regs(void)
{
/* 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__ */
}
# define HAVE_PUSH_REGS
# elif defined(M68K) && defined(MACOS)
# if defined(THINK_C)
# define PushMacReg(reg) \
move.l reg,(sp) \
jsr GC_push_one
void GC_push_regs(void)
{
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.
}
}
# define HAVE_PUSH_REGS
# undef PushMacReg
# elif defined(__MWERKS__)
void GC_push_regs(void)
{
PushMacRegisters();
}
# define HAVE_PUSH_REGS
# endif /* __MWERKS__ */
# endif /* MACOS */
#endif /* !USE_ASM_PUSH_REGS */
#if defined(HAVE_PUSH_REGS) && defined(THREADS)
# error GC_push_regs cannot be used with threads
/* Would fail for GC_do_blocking. There are probably other safety */
/* issues. */
# undef HAVE_PUSH_REGS
#endif
#if !defined(HAVE_PUSH_REGS) && defined(UNIX_LIKE)
# include <signal.h>
# ifndef NO_GETCONTEXT
# include <ucontext.h>
# ifdef GETCONTEXT_FPU_EXCMASK_BUG
# include <fenv.h>
# endif
# endif
#endif /* !HAVE_PUSH_REGS */
/* Ensure that either registers are pushed, or callee-save registers */
/* are somewhere on the stack, and then call fn(arg, ctxt). */
/* ctxt is either a pointer to a ucontext_t we generated, or NULL. */
GC_INNER void GC_with_callee_saves_pushed(void (*fn)(ptr_t, void *),
ptr_t arg)
{
word dummy;
void * context = 0;
# if defined(HAVE_PUSH_REGS)
GC_push_regs();
# elif defined(UNIX_LIKE) && !defined(NO_GETCONTEXT)
/* Older versions of Darwin seem to lack getcontext(). */
/* ARM and MIPS Linux often doesn't support a real */
/* getcontext(). */
ucontext_t ctxt;
# ifdef GETCONTEXT_FPU_EXCMASK_BUG
/* Workaround a bug (clearing the FPU exception mask) in */
/* getcontext on Linux/x86_64. */
# ifdef X86_64
/* We manipulate FPU control word here just not to force the */
/* client application to use -lm linker option. */
unsigned short old_fcw;
__asm__ __volatile__ ("fstcw %0" : "=m" (*&old_fcw));
# else
int except_mask = fegetexcept();
# endif
# endif
if (getcontext(&ctxt) < 0)
ABORT ("getcontext failed: Use another register retrieval method?");
# ifdef GETCONTEXT_FPU_EXCMASK_BUG
# ifdef X86_64
__asm__ __volatile__ ("fldcw %0" : : "m" (*&old_fcw));
{
unsigned mxcsr;
/* And now correct the exception mask in SSE MXCSR. */
__asm__ __volatile__ ("stmxcsr %0" : "=m" (*&mxcsr));
mxcsr = (mxcsr & ~(FE_ALL_EXCEPT << 7)) |
((old_fcw & FE_ALL_EXCEPT) << 7);
__asm__ __volatile__ ("ldmxcsr %0" : : "m" (*&mxcsr));
}
# else /* !X86_64 */
if (feenableexcept(except_mask) < 0)
ABORT("feenableexcept failed");
# endif
# endif
context = &ctxt;
# if defined(SPARC) || defined(IA64)
/* On a register window machine, we need to save register */
/* contents on the stack for this to work. This may already be */
/* subsumed by the getcontext() call. */
GC_save_regs_ret_val = GC_save_regs_in_stack();
# endif /* register windows. */
# elif defined(HAVE_BUILTIN_UNWIND_INIT) \
&& !(defined(POWERPC) && defined(DARWIN)) \
&& !(defined(I386) && defined(RTEMS))
/* This was suggested by Richard Henderson as the way to */
/* force callee-save registers and register windows onto */
/* the stack. */
/* Mark Sibly points out that this doesn't seem to work */
/* on MacOS 10.3.9/PowerPC. */
__builtin_unwind_init();
# else /* !HAVE_BUILTIN_UNWIND_INIT && !UNIX_LIKE */
/* && !HAVE_PUSH_REGS */
/* 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(MSWIN32) || defined(MSWINCE) || defined(UTS4) \
|| defined(LINUX) || defined(EWS4800) || defined(RTEMS)
(void) setjmp(regs);
# else
(void) _setjmp(regs);
/* We don't want to mess with signals. According to */
/* SUSV3, setjmp() may or may not save signal mask. */
/* _setjmp won't, but is less portable. */
# endif
# endif /* !HAVE_PUSH_REGS ... */
/* FIXME: context here is sometimes just zero. At the moment the */
/* callees don't really need it. */
fn(arg, context);
/* Strongly discourage the compiler from treating the above */
/* as a tail-call, since that would pop the register */
/* contents before we get a chance to look at them. */
GC_noop1((word)(&dummy));
}
#if defined(ASM_CLEAR_CODE)
# ifdef LINT
/*ARGSUSED*/
ptr_t GC_clear_stack_inner(ptr_t arg, word limit)
{
return(arg);
}
/* The real version is in a .S file */
# endif
#endif /* ASM_CLEAR_CODE */