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| author | Matt Redfearn <matt.redfearn@mips.com> | 2018-04-17 18:40:01 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-04-24 10:34:16 +0300 |
| commit | 1179774213638107fcaf8745435e39cd27babddb (patch) | |
| tree | 9c267575fb96a1349965bfaf2a755dbc23414203 /arch/mips | |
| parent | d385cc6917c4fb27f883694b5f53253a289b60c8 (diff) | |
| download | linux-1179774213638107fcaf8745435e39cd27babddb.tar.xz | |
MIPS: uaccess: Add micromips clobbers to bzero invocation
commit b3d7e55c3f886493235bfee08e1e5a4a27cbcce8 upstream.
The micromips implementation of bzero additionally clobbers registers t7
& t8. Specify this in the clobbers list when invoking bzero.
Fixes: 26c5e07d1478 ("MIPS: microMIPS: Optimise 'memset' core library function.")
Reported-by: James Hogan <jhogan@kernel.org>
Signed-off-by: Matt Redfearn <matt.redfearn@mips.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: <stable@vger.kernel.org> # 3.10+
Patchwork: https://patchwork.linux-mips.org/patch/19110/
Signed-off-by: James Hogan <jhogan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/mips')
| -rw-r--r-- | arch/mips/include/asm/uaccess.h | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/arch/mips/include/asm/uaccess.h b/arch/mips/include/asm/uaccess.h index 89fa5c0b1579..c92f4c28db7f 100644 --- a/arch/mips/include/asm/uaccess.h +++ b/arch/mips/include/asm/uaccess.h @@ -1257,6 +1257,13 @@ __clear_user(void __user *addr, __kernel_size_t size) { __kernel_size_t res; +#ifdef CONFIG_CPU_MICROMIPS +/* micromips memset / bzero also clobbers t7 & t8 */ +#define bzero_clobbers "$4", "$5", "$6", __UA_t0, __UA_t1, "$15", "$24", "$31" +#else +#define bzero_clobbers "$4", "$5", "$6", __UA_t0, __UA_t1, "$31" +#endif /* CONFIG_CPU_MICROMIPS */ + if (eva_kernel_access()) { __asm__ __volatile__( "move\t$4, %1\n\t" @@ -1266,7 +1273,7 @@ __clear_user(void __user *addr, __kernel_size_t size) "move\t%0, $6" : "=r" (res) : "r" (addr), "r" (size) - : "$4", "$5", "$6", __UA_t0, __UA_t1, "$31"); + : bzero_clobbers); } else { might_fault(); __asm__ __volatile__( @@ -1277,7 +1284,7 @@ __clear_user(void __user *addr, __kernel_size_t size) "move\t%0, $6" : "=r" (res) : "r" (addr), "r" (size) - : "$4", "$5", "$6", __UA_t0, __UA_t1, "$31"); + : bzero_clobbers); } return res; |