- {
-# 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) || defined(EWS4800)
- (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);
- }