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runtime: use alignof to check alignment of ucontext_t

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Use alignof rather than assuming a 16 byte alignment.
    
    Reviewed-on: https://go-review.googlesource.com/28913

From-SVN: r240047
This commit is contained in:
Ian Lance Taylor 2016-09-09 16:39:44 +00:00
parent a9ca0a9d02
commit ac376b15df
2 changed files with 8 additions and 2 deletions
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2
gcc/go/gofrontend/MERGE
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@ -1,4 +1,4 @@
b37a9e66ea584885043240f8f6f1d1c0284eadec
6c1f159cdcb56ebff617f6bbc6c97943a1a8a34d
The first line of this file holds the git revision number of the last
merge done from the gofrontend repository.

8
libgo/runtime/proc.c
View file

@ -166,7 +166,13 @@ static ucontext_t*
ucontext_arg(void** go_ucontext)
{
uintptr_t p = (uintptr_t)go_ucontext;
p = (p + 15) &~ (uintptr_t)0xf;
size_t align = __alignof__(ucontext_t);
if(align > 16) {
// We only ensured space for up to a 16 byte alignment
// in libgo/go/runtime/runtime2.go.
runtime_throw("required alignment of ucontext_t too large");
}
p = (p + align - 1) &~ (uintptr_t)(align - 1);
return (ucontext_t*)p;
}