diff options
| author | Russell King <rmk+kernel@armlinux.org.uk> | 2019-11-08 13:35:31 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-11-10 11:21:27 +0100 |
| commit | 8143a0f9c06359d9746a4c425d077a8ecf528ddb (patch) | |
| tree | d5844a66e353a98d0a0b9e427a0794dce597c38e /arch | |
| parent | 0df031995c6572a0f00589f5c615ef7bca0b0c43 (diff) | |
ARM: spectre-v1: add speculation barrier (csdb) macros
Commit a78d156587931a2c3b354534aa772febf6c9e855 upstream.
Add assembly and C macros for the new CSDB instruction.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Boot-tested-by: Tony Lindgren <tony@atomide.com>
Reviewed-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: David A. Long <dave.long@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/include/asm/assembler.h | 8 | ||||
| -rw-r--r-- | arch/arm/include/asm/barrier.h | 13 |
2 files changed, 21 insertions, 0 deletions
diff --git a/arch/arm/include/asm/assembler.h b/arch/arm/include/asm/assembler.h index 4a275fba6059..307901f88a1e 100644 --- a/arch/arm/include/asm/assembler.h +++ b/arch/arm/include/asm/assembler.h @@ -441,6 +441,14 @@ THUMB( orr \reg , \reg , #PSR_T_BIT ) .size \name , . - \name .endm + .macro csdb +#ifdef CONFIG_THUMB2_KERNEL + .inst.w 0xf3af8014 +#else + .inst 0xe320f014 +#endif + .endm + .macro check_uaccess, addr:req, size:req, limit:req, tmp:req, bad:req #ifndef CONFIG_CPU_USE_DOMAINS adds \tmp, \addr, #\size - 1 diff --git a/arch/arm/include/asm/barrier.h b/arch/arm/include/asm/barrier.h index 27c1d26b05b5..edd9e633a84b 100644 --- a/arch/arm/include/asm/barrier.h +++ b/arch/arm/include/asm/barrier.h @@ -18,6 +18,12 @@ #define isb(option) __asm__ __volatile__ ("isb " #option : : : "memory") #define dsb(option) __asm__ __volatile__ ("dsb " #option : : : "memory") #define dmb(option) __asm__ __volatile__ ("dmb " #option : : : "memory") +#ifdef CONFIG_THUMB2_KERNEL +#define CSDB ".inst.w 0xf3af8014" +#else +#define CSDB ".inst 0xe320f014" +#endif +#define csdb() __asm__ __volatile__(CSDB : : : "memory") #elif defined(CONFIG_CPU_XSC3) || __LINUX_ARM_ARCH__ == 6 #define isb(x) __asm__ __volatile__ ("mcr p15, 0, %0, c7, c5, 4" \ : : "r" (0) : "memory") @@ -38,6 +44,13 @@ #define dmb(x) __asm__ __volatile__ ("" : : : "memory") #endif +#ifndef CSDB +#define CSDB +#endif +#ifndef csdb +#define csdb() +#endif + #ifdef CONFIG_ARM_HEAVY_MB extern void (*soc_mb)(void); extern void arm_heavy_mb(void); |