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_setjmp.S revision 1.2 
      1  1.2  ross /*	$NetBSD: _setjmp.S,v 1.2 2006/07/05 18:06:47 ross Exp $	*/
      2  1.1  ross 
      3  1.1  ross #include <machine/asm.h>
      4  1.1  ross 
      5  1.1  ross #if defined(LIBC_SCCS)
      6  1.1  ross 	.text
      7  1.2  ross 	.asciz "$NetBSD: _setjmp.S,v 1.2 2006/07/05 18:06:47 ross Exp $"
      8  1.1  ross #endif
      9  1.1  ross 
     10  1.1  ross /*
     11  1.1  ross  * C library -- _setjmp, _longjmp
     12  1.1  ross  *
     13  1.1  ross  *	_longjmp(a,v)
     14  1.1  ross  * will generate a "return(v?v:1)" from the last call to
     15  1.1  ross  *	_setjmp(a)
     16  1.1  ross  * by restoring registers from the stack.
     17  1.1  ross  * The previous signal state is NOT restored.
     18  1.1  ross  */
     19  1.1  ross 
     20  1.1  ross ENTRY(_setjmp)
     21  1.1  ross 	mflr	%r11			/* save return address */
     22  1.1  ross 	mfcr	%r12			/* save condition register */
     23  1.1  ross 	mr	%r10,%r1		/* save stack pointer */
     24  1.1  ross 	mr	%r9,%r2			/* save GPR2 (not needed) */
     25  1.2  ross 	i = 0
     26  1.2  ross 	.rept	32-9
     27  1.2  ross 	std	9+i,i*8+16(%r3)
     28  1.2  ross 	i = i + 1
     29  1.2  ross 	.endr
     30  1.1  ross 	li	%r3,0			/* indicate success */
     31  1.1  ross 	blr				/* return */
     32  1.1  ross 
     33  1.1  ross ENTRY(_longjmp)
     34  1.2  ross 	i = 0
     35  1.2  ross 	.rept	32-9
     36  1.2  ross 	ld	9+i,i*8+16(%r3)
     37  1.2  ross 	i = i + 1
     38  1.2  ross 	.endr
     39  1.1  ross 	mtlr	%r11			/* restore LR */
     40  1.1  ross 	mtcr	%r12			/* restore CR */
     41  1.1  ross 	mr	%r2,%r9			/* restore GPR2 (not needed) */
     42  1.1  ross 	mr	%r1,%r10		/* restore stack */
     43  1.1  ross 	or.	%r3,%r4,%r4		/* get return value */
     44  1.1  ross 	bnelr				/* return if not 0 */
     45  1.1  ross 	li	%r3,1			/* what's the point? */
     46  1.1  ross 	blr				/* return */
     47