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 | |
| 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')
| -rw-r--r-- | arch/mips/Kconfig | 2 | ||||
| -rw-r--r-- | arch/mips/include/asm/thread_info.h | 2 | ||||
| -rw-r--r-- | arch/mips/kernel/irq.c | 3 | ||||
| -rw-r--r-- | arch/mips/lib/uncached.c | 4 |
4 files changed, 8 insertions, 3 deletions
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index 3f58b45fc953..0dae5f1e61cc 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -4,7 +4,7 @@ config MIPS default y select ARCH_32BIT_OFF_T if !64BIT select ARCH_BINFMT_ELF_STATE if MIPS_FP_SUPPORT - select ARCH_HAS_CURRENT_STACK_POINTER + select ARCH_HAS_CURRENT_STACK_POINTER if !CC_IS_CLANG || CLANG_VERSION >= 140000 select ARCH_HAS_DEBUG_VIRTUAL if !64BIT select ARCH_HAS_FORTIFY_SOURCE select ARCH_HAS_KCOV 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__ */ diff --git a/arch/mips/kernel/irq.c b/arch/mips/kernel/irq.c index fc313c49a417..5e11582fe308 100644 --- a/arch/mips/kernel/irq.c +++ b/arch/mips/kernel/irq.c @@ -75,8 +75,9 @@ void __init init_IRQ(void) #ifdef CONFIG_DEBUG_STACKOVERFLOW static inline void check_stack_overflow(void) { - unsigned long sp = current_stack_pointer; + unsigned long sp; + __asm__ __volatile__("move %0, $sp" : "=r" (sp)); sp &= THREAD_MASK; /* diff --git a/arch/mips/lib/uncached.c b/arch/mips/lib/uncached.c index f8d4ca046c3e..f80a67c092b6 100644 --- a/arch/mips/lib/uncached.c +++ b/arch/mips/lib/uncached.c @@ -40,7 +40,9 @@ unsigned long run_uncached(void *func) register long ret __asm__("$2"); long lfunc = (long)func, ufunc; long usp; - long sp = current_stack_pointer; + long sp; + + __asm__("move %0, $sp" : "=r" (sp)); if (sp >= (long)CKSEG0 && sp < (long)CKSEG2) usp = CKSEG1ADDR(sp); |