diff options
Diffstat (limited to 'arch/arm/include/asm/uaccess-asm.h')
| -rw-r--r-- | arch/arm/include/asm/uaccess-asm.h | 30 |
1 files changed, 13 insertions, 17 deletions
diff --git a/arch/arm/include/asm/uaccess-asm.h b/arch/arm/include/asm/uaccess-asm.h index d475e3e8145d..e46468b91eaa 100644 --- a/arch/arm/include/asm/uaccess-asm.h +++ b/arch/arm/include/asm/uaccess-asm.h @@ -67,30 +67,23 @@ #endif .endm - .macro uaccess_save, tmp #ifdef CONFIG_CPU_SW_DOMAIN_PAN - mrc p15, 0, \tmp, c3, c0, 0 - str \tmp, [sp, #SVC_DACR] -#endif - .endm - - .macro uaccess_restore -#ifdef CONFIG_CPU_SW_DOMAIN_PAN - ldr r0, [sp, #SVC_DACR] - mcr p15, 0, r0, c3, c0, 0 +#define DACR(x...) x +#else +#define DACR(x...) #endif - .endm /* * Save the address limit on entry to a privileged exception and * if using PAN, save and disable usermode access. */ .macro uaccess_entry, tsk, tmp0, tmp1, tmp2, disable - ldr \tmp0, [\tsk, #TI_ADDR_LIMIT] - mov \tmp1, #TASK_SIZE - str \tmp1, [\tsk, #TI_ADDR_LIMIT] - str \tmp0, [sp, #SVC_ADDR_LIMIT] - uaccess_save \tmp0 + ldr \tmp1, [\tsk, #TI_ADDR_LIMIT] + mov \tmp2, #TASK_SIZE + str \tmp2, [\tsk, #TI_ADDR_LIMIT] + DACR( mrc p15, 0, \tmp0, c3, c0, 0) + DACR( str \tmp0, [sp, #SVC_DACR]) + str \tmp1, [sp, #SVC_ADDR_LIMIT] .if \disable uaccess_disable \tmp0 .endif @@ -99,8 +92,11 @@ /* Restore the user access state previously saved by uaccess_entry */ .macro uaccess_exit, tsk, tmp0, tmp1 ldr \tmp1, [sp, #SVC_ADDR_LIMIT] - uaccess_restore + DACR( ldr \tmp0, [sp, #SVC_DACR]) str \tmp1, [\tsk, #TI_ADDR_LIMIT] + DACR( mcr p15, 0, \tmp0, c3, c0, 0) .endm +#undef DACR + #endif /* __ASM_UACCESS_ASM_H__ */ |