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Re: [PATCH 1b/9] Tilera (and Linux asm-generic) support for glibc
On Sat, 5 Nov 2011, Chris Metcalf wrote:
> The other thing that our backtracer does correctly is parse the kernel's
> sigreturn data so that it can backtrace across a signal. Does the IA64
> DWARF-based backtracer handle that?
This is what linux-unwind.h (MD_FALLBACK_FRAME_STATE_FOR) in the GCC
sources is for (now in libgcc/config/<arch>, formerly in
gcc/config/<arch>): signal frame unwinding. If you don't have it or it's
broken, I'd expect the testcases gcc.dg/cleanup-{8,9,10,11}.c to fail.
(Some targets may have variant approaches, such as signal frames using a
vDSO for which the kernel provides unwind info, or the ARM EABI approach
of sigrestorer.S in glibc with just enough unwind info.)
--
Joseph S. Myers
joseph@codesourcery.com