scoutos / prex-0.9.0 / usr / arch / ppc / setjmp.S @ 03e9c04a
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/* $NetBSD: _setjmp.S,v 1.2 2002/07/30 06:07:57 matt Exp $ */ |
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#include <machine/asm.h> |
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#include <machine/setjmp.h> |
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/* |
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* C library -- setjmp, longjmp |
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* |
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* longjmp(a,v) |
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* will generate a "return(v)" from the last call to |
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* setjmp(a) |
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* by restoring registers from the stack. |
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* The previous signal state is restored. |
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*/ |
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ENTRY(setjmp) |
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mflr %r11 /* save return address */ |
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mfcr %r12 /* save condition register */ |
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mr %r10,%r1 /* save stack pointer */ |
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mr %r9,%r2 /* save GPR2 (not needed) */ |
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stmw %r9,8(%r3) /* save r9..r31 */ |
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li %r3,0 /* indicate success */ |
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blr /* return */ |
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ENTRY(longjmp) |
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lmw %r9,8(%r3) /* save r9..r31 */ |
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mtlr %r11 /* restore LR */ |
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mtcr %r12 /* restore CR */ |
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mr %r2,%r9 /* restore GPR2 (not needed) */ |
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mr %r1,%r10 /* restore stack */ |
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or. %r3,%r4,%r4 /* get return value */ |
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bnelr /* return if not 0 */ |
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li %r3,1 /* what's the point? */ |
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blr /* return */ |