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Fix ucontext creation in call_signal handler

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* exceptions.cc (__unwind_single_frame): Define empty macro on i686.
        (_cygtls::call_signal_handler): Try to make sure signal context makes
        sense in case we're generating context here.  Add comment to explain.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen 2015-07-17 18:29:52 +02:00
parent 16d2d9f131
commit b2df1577c7
2 changed files with 21 additions and 4 deletions
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6
winsup/cygwin/ChangeLog
View File

@ -1,3 +1,9 @@
2015-07-17 Corinna Vinschen <corinna@vinschen.de>
* exceptions.cc (__unwind_single_frame): Define empty macro on i686.
(_cygtls::call_signal_handler): Try to make sure signal context makes
sense in case we're generating context here. Add comment to explain.
2015-07-17 Corinna Vinschen <corinna@vinschen.de>
* exceptions.cc (getcontext/x86_64): Drop comment on RtlCaptureContext.

19
winsup/cygwin/exceptions.cc
View File

@ -300,6 +300,8 @@ __unwind_single_frame (PCONTEXT ctx)
ctx->Rsp += 8;
}
}
#else
#define __unwind_single_frame(ctx)
#endif
/* Walk the stack.
@ -1667,11 +1669,20 @@ _cygtls::call_signal_handler ()
sizeof (CONTEXT));
else
{
/* FIXME: Really this should be the context which the signal
interrupted? */
memset(&context.uc_mcontext, 0, sizeof (struct __mcontext));
/* Software-generated signal. We're fetching the current
context, unwind to the caller and in case we're called
from sigdelayed, fix rip/eip accordingly. */
context.uc_mcontext.ctxflags = CONTEXT_FULL;
RtlCaptureContext ((CONTEXT *) &context.uc_mcontext);
RtlCaptureContext ((PCONTEXT) &context.uc_mcontext);
__unwind_single_frame ((PCONTEXT) &context.uc_mcontext);
if (stackptr > stack)
{
#ifdef __x86_64__
context.uc_mcontext.rip = retaddr ();
#else
context.uc_mcontext.eip = retaddr ();
#endif
}
}
if (this_sa_flags & SA_ONSTACK