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_setjmp.S revision 1.3 
      1  1.3     matt /*	$NetBSD: _setjmp.S,v 1.3 2011/01/15 07:31:12 matt Exp $	*/
      2  1.1  thorpej 
      3  1.1  thorpej #include <machine/asm.h>
      4  1.1  thorpej 
      5  1.1  thorpej #if defined(LIBC_SCCS)
      6  1.3     matt __RCSID("$NetBSD: _setjmp.S,v 1.3 2011/01/15 07:31:12 matt Exp $")
      7  1.1  thorpej #endif
      8  1.1  thorpej 
      9  1.1  thorpej /*
     10  1.1  thorpej  * C library -- _setjmp, _longjmp
     11  1.1  thorpej  *
     12  1.1  thorpej  *	_longjmp(a,v)
     13  1.1  thorpej  * will generate a "return(v?v:1)" from the last call to
     14  1.1  thorpej  *	_setjmp(a)
     15  1.1  thorpej  * by restoring registers from the stack.
     16  1.1  thorpej  * The previous signal state is NOT restored.
     17  1.1  thorpej  */
     18  1.1  thorpej 
     19  1.1  thorpej ENTRY(_setjmp)
     20  1.2     matt 	mflr	%r11			/* save return address */
     21  1.2     matt 	mfcr	%r12			/* save condition register */
     22  1.2     matt 	mr	%r10,%r1		/* save stack pointer */
     23  1.2     matt 	mr	%r9,%r2			/* save GPR2 (not needed) */
     24  1.2     matt 	stmw	%r9,8(%r3)		/* save r9..r31 */
     25  1.2     matt 	li	%r3,0			/* indicate success */
     26  1.2     matt 	blr				/* return */
     27  1.3     matt END(_setjmp)
     28  1.1  thorpej 
     29  1.1  thorpej ENTRY(_longjmp)
     30  1.2     matt 	lmw	%r9,8(%r3)		/* save r9..r31 */
     31  1.2     matt 	mtlr	%r11			/* restore LR */
     32  1.2     matt 	mtcr	%r12			/* restore CR */
     33  1.2     matt 	mr	%r2,%r9			/* restore GPR2 (not needed) */
     34  1.2     matt 	mr	%r1,%r10		/* restore stack */
     35  1.2     matt 	or.	%r3,%r4,%r4		/* get return value */
     36  1.2     matt 	bnelr				/* return if not 0 */
     37  1.2     matt 	li	%r3,1			/* what's the point? */
     38  1.2     matt 	blr				/* return */
     39  1.3     matt END(_longjmp)
     40