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mips: Implement "current_stack_pointer"

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To follow the existing per-arch conventions replace open-coded uses
of asm "sp" as "current_stack_pointer". This will let it be used in
non-arch places (like HARDENED_USERCOPY).

Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Yanteng Si <siyanteng01@gmail.com>
Cc: linux-mips@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
This commit is contained in:
Kees Cook 2022-02-23 22:04:32 -08:00 committed by Thomas Bogendoerfer
parent 455481fc9a
commit 200ed341b8
4 changed files with 5 additions and 5 deletions
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1
arch/mips/Kconfig
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@ -4,6 +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_DEBUG_VIRTUAL if !64BIT
select ARCH_HAS_FORTIFY_SOURCE
select ARCH_HAS_KCOV

2
arch/mips/include/asm/thread_info.h
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@ -69,6 +69,8 @@ static inline struct thread_info *current_thread_info(void)
return __current_thread_info;
}
register unsigned long current_stack_pointer __asm__("sp");
#endif /* !__ASSEMBLY__ */
/* thread information allocation */

3
arch/mips/kernel/irq.c
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@ -75,9 +75,8 @@ void __init init_IRQ(void)
#ifdef CONFIG_DEBUG_STACKOVERFLOW
static inline void check_stack_overflow(void)
{
unsigned long sp;
unsigned long sp = current_stack_pointer;
__asm__ __volatile__("move %0, $sp" : "=r" (sp));
sp &= THREAD_MASK;
/*

4
arch/mips/lib/uncached.c
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@ -40,9 +40,7 @@ unsigned long run_uncached(void *func)
register long ret __asm__("$2");
long lfunc = (long)func, ufunc;
long usp;
long sp;
__asm__("move %0, $sp" : "=r" (sp));
long sp = current_stack_pointer;
if (sp >= (long)CKSEG0 && sp < (long)CKSEG2)
usp = CKSEG1ADDR(sp);