procyberian/gcc
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

libgcc: i386/linux-unwind.h: always rely on sys/ucontext.h

Browse source 
When gcc is built for x86_64-linux-musl target, stack unwinding from
within signal handler stops at the innermost signal frame.  The reason
for this behaviro is that the signal trampoline is not accompanied with
appropiate CFI directives, and the fallback path in libgcc to recognize
it by the code sequence is only enabled for glibc except 2.0.  The
latter is motivated by the lack of sys/ucontext.h in that glibc version.

Given that all relevant libc-s ship sys/ucontext.h for over a decade,
and that other arches aren't shy of unconditionally using it, follow
suit and remove the preprocessor condition, too.

libgcc/ChangeLog:

	* config/i386/linux-unwind.h: Remove preprocessor
	condition to enable fallback path for all libc-s.

Signed-off-by: Roman Kagan <rkagan@amazon.de>
This commit is contained in:
Roman Kagan 2025-01-02 16:32:17 +01:00 • committed by Uros Bizjak
parent 44d4a1086d
commit e129b8d768
1 changed files with 0 additions and 7 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

7
libgcc/config/i386/linux-unwind.h
View file

@ -33,12 +33,6 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
#ifndef inhibit_libc
/* There's no sys/ucontext.h for glibc 2.0, so no
signal-turned-exceptions for them. There's also no configure-run for
the target, so we can't check on (e.g.) HAVE_SYS_UCONTEXT_H. Using the
target libc version macro should be enough. */
#if defined __GLIBC__ && !(__GLIBC__ == 2 && __GLIBC_MINOR__ == 0)
#include <signal.h>
#include <sys/ucontext.h>
@ -199,5 +193,4 @@ x86_frob_update_context (struct _Unwind_Context *context,
}
#endif /* ifdef __x86_64__ */
#endif /* not glibc 2.0 */
#endif /* ifdef inhibit_libc */