diff options
| author | Kees Cook <keescook@chromium.org> | 2022-03-09 14:09:39 -0800 |
|---|---|---|
| committer | Thomas Bogendoerfer <tsbogend@alpha.franken.de> | 2022-03-14 15:02:53 +0100 |
| commit | b847bd64ea9f484510e27065cb2bccc58d9b829b (patch) | |
| tree | 6ee0d94d6ce3516b2047ecf0bfcab2148afcc273 /arch/mips/include/asm/thread_info.h | |
| parent | 4d409ca3e5107a1b300d0f36550d61c5da4fd8a7 (diff) | |
MIPS: Only use current_stack_pointer on GCC
Unfortunately, Clang did not have support for "sp" as a global register
definition, and was crashing after the addition of current_stack_pointer.
This has been fixed in Clang 14, but earlier Clang versions need to
avoid this code, so add a versioned test and revert back to the
open-coded asm instances. Fixes Clang build error:
fatal error: error in backend: Invalid register name global variable
Fixes: 200ed341b864 ("mips: Implement "current_stack_pointer"")
Reported-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Link: https://lore.kernel.org/lkml/YikTQRql+il3HbrK@dev-arch.thelio-3990X
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Yanteng Si <siyanteng01@gmail.com>
Cc: linux-mips@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Diffstat (limited to 'arch/mips/include/asm/thread_info.h')
| -rw-r--r-- | arch/mips/include/asm/thread_info.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/mips/include/asm/thread_info.h b/arch/mips/include/asm/thread_info.h index 4463348d2372..ecae7470faa4 100644 --- a/arch/mips/include/asm/thread_info.h +++ b/arch/mips/include/asm/thread_info.h @@ -69,7 +69,9 @@ static inline struct thread_info *current_thread_info(void) return __current_thread_info; } +#ifdef CONFIG_ARCH_HAS_CURRENT_STACK_POINTER register unsigned long current_stack_pointer __asm__("sp"); +#endif #endif /* !__ASSEMBLY__ */ |