scoutos / prex-0.9.0 / usr / arch / ppc / setjmp.S @ 03e9c04a
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| 1 | 03e9c04a | Brad Neuman | /* $NetBSD: _setjmp.S,v 1.2 2002/07/30 06:07:57 matt Exp $ */ |
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| 2 | |||
| 3 | #include <machine/asm.h> |
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| 4 | #include <machine/setjmp.h> |
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| 5 | |||
| 6 | /* |
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| 7 | * C library -- setjmp, longjmp |
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| 8 | * |
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| 9 | * longjmp(a,v) |
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| 10 | * will generate a "return(v)" from the last call to |
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| 11 | * setjmp(a) |
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| 12 | * by restoring registers from the stack. |
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| 13 | * The previous signal state is restored. |
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| 14 | */ |
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| 15 | |||
| 16 | ENTRY(setjmp) |
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| 17 | mflr %r11 /* save return address */ |
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| 18 | mfcr %r12 /* save condition register */ |
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| 19 | mr %r10,%r1 /* save stack pointer */ |
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| 20 | mr %r9,%r2 /* save GPR2 (not needed) */ |
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| 21 | stmw %r9,8(%r3) /* save r9..r31 */ |
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| 22 | li %r3,0 /* indicate success */ |
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| 23 | blr /* return */ |
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| 24 | |||
| 25 | ENTRY(longjmp) |
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| 26 | lmw %r9,8(%r3) /* save r9..r31 */ |
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| 27 | mtlr %r11 /* restore LR */ |
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| 28 | mtcr %r12 /* restore CR */ |
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| 29 | mr %r2,%r9 /* restore GPR2 (not needed) */ |
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| 30 | mr %r1,%r10 /* restore stack */ |
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| 31 | or. %r3,%r4,%r4 /* get return value */ |
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| 32 | bnelr /* return if not 0 */ |
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| 33 | li %r3,1 /* what's the point? */ |
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| 34 | blr /* return */ |