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t16-byte align - plan9port - [fork] Plan 9 from user space |
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git clone git://src.adamsgaard.dk/plan9port |
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--- |
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commit fa07e3d777fc52a7c564f71c9b7f2bba1d0e7716 |
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parent d9ed72433f25ec45908dede1022425a3f3ed1c67 |
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Author: rsc <devnull@localhost> |
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Date: Sat, 22 Apr 2006 00:50:08 +0000 |
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16-byte align |
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Diffstat: |
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M src/libthread/Darwin-386.c | 9 +++++++++ |
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1 file changed, 9 insertions(+), 0 deletions(-) |
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--- |
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diff --git a/src/libthread/Darwin-386.c b/src/libthread/Darwin-386.c |
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t@@ -3,10 +3,19 @@ |
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void |
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makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...) |
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{ |
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+ int n; |
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int *sp; |
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sp = (int*)ucp->uc_stack.ss_sp+ucp->uc_stack.ss_size/4; |
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sp -= argc; |
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+ /* |
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+ * Stack pointer at call instruction (before return address |
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+ * gets pushed) must be 16-byte aligned. |
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+ */ |
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+ if((uintptr)sp%4) |
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+ abort(); |
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+ while((uintptr)sp%16) |
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+ sp--; |
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memmove(sp, &argc+1, argc*sizeof(int)); |
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*--sp = 0; /* return address */ |
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ucp->uc_mcontext.mc_eip = (long)func; |
