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author | Russell King <rmk+kernel@armlinux.org.uk> | 2020-05-03 15:14:09 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-06-03 09:17:58 +0300 |
commit | bc2f44465677d5a5b5ff12841bfd9e4afaa416b5 (patch) | |
tree | f8325f7214b5a8dfe244825496bf9a6017402d7d /arch/arm | |
parent | 66c1955c40ae7ef702ffe2fc23278bc30d32ef47 (diff) | |
download | linux-bc2f44465677d5a5b5ff12841bfd9e4afaa416b5.tar.xz |
ARM: uaccess: integrate uaccess_save and uaccess_restore
[ Upstream commit 8ede890b0bcebe8c760aacfe20e934d98c3dc6aa ]
Integrate uaccess_save / uaccess_restore macros into the new
uaccess_entry / uaccess_exit macros respectively.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'arch/arm')
-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__ */ |