Home | History | Annotate | Line # | Download | only in gen
_setjmp.S revision 1.2 
      1 /*	$NetBSD: _setjmp.S,v 1.2 2006/07/05 18:06:47 ross Exp $	*/
      2 
      3 #include <machine/asm.h>
      4 
      5 #if defined(LIBC_SCCS)
      6 	.text
      7 	.asciz "$NetBSD: _setjmp.S,v 1.2 2006/07/05 18:06:47 ross Exp $"
      8 #endif
      9 
     10 /*
     11  * C library -- _setjmp, _longjmp
     12  *
     13  *	_longjmp(a,v)
     14  * will generate a "return(v?v:1)" from the last call to
     15  *	_setjmp(a)
     16  * by restoring registers from the stack.
     17  * The previous signal state is NOT restored.
     18  */
     19 
     20 ENTRY(_setjmp)
     21 	mflr	%r11			/* save return address */
     22 	mfcr	%r12			/* save condition register */
     23 	mr	%r10,%r1		/* save stack pointer */
     24 	mr	%r9,%r2			/* save GPR2 (not needed) */
     25 	i = 0
     26 	.rept	32-9
     27 	std	9+i,i*8+16(%r3)
     28 	i = i + 1
     29 	.endr
     30 	li	%r3,0			/* indicate success */
     31 	blr				/* return */
     32 
     33 ENTRY(_longjmp)
     34 	i = 0
     35 	.rept	32-9
     36 	ld	9+i,i*8+16(%r3)
     37 	i = i + 1
     38 	.endr
     39 	mtlr	%r11			/* restore LR */
     40 	mtcr	%r12			/* restore CR */
     41 	mr	%r2,%r9			/* restore GPR2 (not needed) */
     42 	mr	%r1,%r10		/* restore stack */
     43 	or.	%r3,%r4,%r4		/* get return value */
     44 	bnelr				/* return if not 0 */
     45 	li	%r3,1			/* what's the point? */
     46 	blr				/* return */
     47