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| author | Gary S. Robertson <gary.robertson@linaro.org> | 2016-01-20 15:45:29 -0600 |
|---|---|---|
| committer | Gary S. Robertson <gary.robertson@linaro.org> | 2016-01-20 15:45:29 -0600 |
| commit | 1d10e9e61dedad92bcf380a421d08f021e62ff1b (patch) | |
| tree | 8e7641caa0710f4eba713a7f25de5eb314720993 /arch/arm64/lib/copy_in_user.S | |
| parent | d532db8c82faef41ad16e6db7a8459aa21f4a822 (diff) | |
| parent | 9f41e6b222c4a04c7b46068df82842a6188b4a57 (diff) | |
Merge tag 'lsk-v4.1-15.12' of http://git.linaro.org/kernel/linux-linaro-stable into linux-linaro-lng-v4.1linux-lng-4.1.14-2016.03linux-lng-4.1.14-2016.02linux-lng-4.1.14-2016.01linux-linaro-lng-v4.1
LSK 15.12 v4.1
Diffstat (limited to 'arch/arm64/lib/copy_in_user.S')
| -rw-r--r-- | arch/arm64/lib/copy_in_user.S | 25 |
1 files changed, 19 insertions, 6 deletions
diff --git a/arch/arm64/lib/copy_in_user.S b/arch/arm64/lib/copy_in_user.S index 84b6c9bb9b93..1b94661e22b3 100644 --- a/arch/arm64/lib/copy_in_user.S +++ b/arch/arm64/lib/copy_in_user.S @@ -17,7 +17,11 @@ */ #include <linux/linkage.h> + +#include <asm/alternative.h> #include <asm/assembler.h> +#include <asm/cpufeature.h> +#include <asm/sysreg.h> /* * Copy from user space to user space (alignment handled by the hardware) @@ -30,14 +34,21 @@ * x0 - bytes not copied */ ENTRY(__copy_in_user) - add x4, x0, x2 // upper user buffer boundary - subs x2, x2, #8 +ALTERNATIVE("nop", __stringify(SET_PSTATE_PAN(0)), ARM64_HAS_PAN, \ + CONFIG_ARM64_PAN) + add x5, x0, x2 // upper user buffer boundary + subs x2, x2, #16 + b.mi 1f +0: +USER(9f, ldp x3, x4, [x1], #16) + subs x2, x2, #16 +USER(9f, stp x3, x4, [x0], #16) + b.pl 0b +1: adds x2, x2, #8 b.mi 2f -1: USER(9f, ldr x3, [x1], #8 ) - subs x2, x2, #8 + sub x2, x2, #8 USER(9f, str x3, [x0], #8 ) - b.pl 1b 2: adds x2, x2, #4 b.mi 3f USER(9f, ldr w3, [x1], #4 ) @@ -53,11 +64,13 @@ USER(9f, strh w3, [x0], #2 ) USER(9f, ldrb w3, [x1] ) USER(9f, strb w3, [x0] ) 5: mov x0, #0 +ALTERNATIVE("nop", __stringify(SET_PSTATE_PAN(1)), ARM64_HAS_PAN, \ + CONFIG_ARM64_PAN) ret ENDPROC(__copy_in_user) .section .fixup,"ax" .align 2 -9: sub x0, x4, x0 // bytes not copied +9: sub x0, x5, x0 // bytes not copied ret .previous |