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MIPS: lib: strncpy_user: Add EVA support 

In non-EVA mode, strncpy_from_user* aliases are used for the
strncpy_from_kernel* symbols since the code is identical. In EVA
mode, new strcpy_from_user* symbols are used which use the EVA
specific instructions to load values from userspace.

Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
This commit is contained in:
Markos Chandras 2014-01-02 16:40:20 +00:00 committed by Ralf Baechle
parent cc59fe5b88
commit b3c3025b2c
2 changed files with 25 additions and 0 deletions
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6
arch/mips/kernel/mips_ksyms.c
View File

@ -16,6 +16,10 @@
#include <asm/ftrace.h>
extern void *__bzero(void *__s, size_t __count);
extern long __strncpy_from_kernel_nocheck_asm(char *__to,
const char *__from, long __len);
extern long __strncpy_from_kernel_asm(char *__to, const char *__from,
long __len);
extern long __strncpy_from_user_nocheck_asm(char *__to,
const char *__from, long __len);
extern long __strncpy_from_user_asm(char *__to, const char *__from,
@ -48,6 +52,8 @@ EXPORT_SYMBOL(copy_page);
EXPORT_SYMBOL(__copy_user);
EXPORT_SYMBOL(__copy_user_inatomic);
EXPORT_SYMBOL(__bzero);
EXPORT_SYMBOL(__strncpy_from_kernel_nocheck_asm);
EXPORT_SYMBOL(__strncpy_from_kernel_asm);
EXPORT_SYMBOL(__strncpy_from_user_nocheck_asm);
EXPORT_SYMBOL(__strncpy_from_user_asm);
EXPORT_SYMBOL(__strlen_kernel_nocheck_asm);

19
arch/mips/lib/strncpy_user.S
View File

@ -38,7 +38,11 @@ FEXPORT(__strncpy_from_\func\()_nocheck_asm)
.set noreorder
move t0, zero
move v1, a1
.ifeqs "\func","kernel"
1: EX(lbu, v0, (v1), .Lfault\@)
.else
1: EX(lbue, v0, (v1), .Lfault\@)
.endif
PTR_ADDIU v1, 1
R10KCBARRIER(0(ra))
beqz v0, 2f
@ -63,4 +67,19 @@ FEXPORT(__strncpy_from_\func\()_nocheck_asm)
.endm
#ifndef CONFIG_EVA
/* Set aliases */
.global __strncpy_from_user_asm
.global __strncpy_from_user_nocheck_asm
.set __strncpy_from_user_asm, __strncpy_from_kernel_asm
.set __strncpy_from_user_nocheck_asm, __strncpy_from_kernel_nocheck_asm
#endif
__BUILD_STRNCPY_ASM kernel
#ifdef CONFIG_EVA
.set push
.set eva
__BUILD_STRNCPY_ASM user
.set pop
#endif