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Avoid to touch red zone, in libpthread, ucontext may be saved by kernel's

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get_mcontext, and libpthread will use signalcontext to deliver signal in
userland, it looks same as kernel's send_sig does.

Reviewed by: deischen, tjr
This commit is contained in:
David Xu 2004-06-15 21:46:36 +00:00
parent da8f1aa53d
commit 2ff285bf2e
1 changed files with 1 additions and 1 deletions
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2
lib/libc/amd64/gen/signalcontext.c
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@ -58,7 +58,7 @@ __signalcontext(ucontext_t *ucp, int sig, __sighandler_t *func)
* This means that we need an 8-byte-odd alignment since the ABI expects
* the return address to be pushed, thus breaking the 16 byte alignment.
*/
sp = (ucp->uc_mcontext.mc_rsp - sizeof(ucontext_t)) & ~15UL;
sp = (ucp->uc_mcontext.mc_rsp - 128 - sizeof(ucontext_t)) & ~15UL;
sig_uc = (ucontext_t *)sp;
bcopy(ucp, sig_uc, sizeof(*sig_uc));
sp = (sp - sizeof(siginfo_t)) & ~15UL;