diff options
| author | Vineet Gupta <vgupta@synopsys.com> | 2021-06-08 19:39:25 -0700 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2021-06-10 17:21:38 -0700 |
| commit | 96f1b00138cb8f04c742c82d0a7c460b2202e887 (patch) | |
| tree | fe7f0aac7c9ba9661be62c47d20ecba421f90b0b /arch/arc/include | |
| parent | d07f6ca923ea0927a1024dfccafc5b53b61cfecc (diff) | |
ARCv2: save ABI registers across signal handling
ARCv2 has some configuration dependent registers (r30, r58, r59) which
could be targetted by the compiler. To keep the ABI stable, these were
unconditionally part of the glibc ABI
(sysdeps/unix/sysv/linux/arc/sys/ucontext.h:mcontext_t) however we
missed populating them (by saving/restoring them across signal
handling).
This patch fixes the issue by
- adding arcv2 ABI regs to kernel struct sigcontext
- populating them during signal handling
Change to struct sigcontext might seem like a glibc ABI change (although
it primarily uses ucontext_t:mcontext_t) but the fact is
- it has only been extended (existing fields are not touched)
- the old sigcontext was ABI incomplete to begin with anyways
Fixes: https://github.com/foss-for-synopsys-dwc-arc-processors/linux/issues/53
Cc: <stable@vger.kernel.org>
Tested-by: kernel test robot <lkp@intel.com>
Reported-by: Vladimir Isaev <isaev@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc/include')
| -rw-r--r-- | arch/arc/include/uapi/asm/sigcontext.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arc/include/uapi/asm/sigcontext.h b/arch/arc/include/uapi/asm/sigcontext.h index 95f8a4380e11..7a5449dfcb29 100644 --- a/arch/arc/include/uapi/asm/sigcontext.h +++ b/arch/arc/include/uapi/asm/sigcontext.h @@ -18,6 +18,7 @@ */ struct sigcontext { struct user_regs_struct regs; + struct user_regs_arcv2 v2abi; }; #endif /* _ASM_ARC_SIGCONTEXT_H */ |