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MIPS: asm: uaccess: Add v1 register to clobber list on EVA

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When EVA is turned on and prefetching is being used in memcpy.S,
the v1 register is being used as a helper register to the PREFE
instruction. However, v1 ($3) was not in the clobber list, which
means that the compiler did not preserve it across function calls,
and that could corrupt the value of the register leading to all
sorts of userland crashes. We fix this problem by using the
DADDI_SCRATCH macro to define the clobbered register when
CONFIG_EVA && CONFIG_CPU_HAS_PREFETCH are enabled.

Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Cc: <stable@vger.kernel.org> # v3.15+
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/8510/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Markos Chandras 2014-11-17 09:30:23 +00:00 committed by Ralf Baechle
parent bbaf113a48
commit 58563817cf
1 changed files with 4 additions and 3 deletions
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7
arch/mips/include/asm/uaccess.h
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@ -773,10 +773,11 @@ extern void __put_user_unaligned_unknown(void);
"jal\t" #destination "\n\t"
#endif
#ifndef CONFIG_CPU_DADDI_WORKAROUNDS
#define DADDI_SCRATCH "$0"
#else
#if defined(CONFIG_CPU_DADDI_WORKAROUNDS) || (defined(CONFIG_EVA) && \
defined(CONFIG_CPU_HAS_PREFETCH))
#define DADDI_SCRATCH "$3"
#else
#define DADDI_SCRATCH "$0"
#endif
extern size_t __copy_user(void *__to, const void *__from, size_t __n);