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MIPS: lib: strlen_user: Add EVA support

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In non-EVA mode, strlen_user* aliases are used for the
strlen_kernel* symbols since the code is identical. In EVA
mode, new strlen_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 16:04:38 +00:00 committed by Ralf Baechle
parent 5cc494972a
commit 053970542f
2 changed files with 24 additions and 0 deletions
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4
arch/mips/kernel/mips_ksyms.c
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@ -20,6 +20,8 @@ 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,
long __len);
extern long __strlen_kernel_nocheck_asm(const char *s);
extern long __strlen_kernel_asm(const char *s);
extern long __strlen_user_nocheck_asm(const char *s);
extern long __strlen_user_asm(const char *s);
extern long __strnlen_kernel_nocheck_asm(const char *s);
@ -48,6 +50,8 @@ EXPORT_SYMBOL(__copy_user_inatomic);
EXPORT_SYMBOL(__bzero);
EXPORT_SYMBOL(__strncpy_from_user_nocheck_asm);
EXPORT_SYMBOL(__strncpy_from_user_asm);
EXPORT_SYMBOL(__strlen_kernel_nocheck_asm);
EXPORT_SYMBOL(__strlen_kernel_asm);
EXPORT_SYMBOL(__strlen_user_nocheck_asm);
EXPORT_SYMBOL(__strlen_user_asm);
EXPORT_SYMBOL(__strnlen_kernel_nocheck_asm);

20
arch/mips/lib/strlen_user.S
View File

@ -30,7 +30,11 @@ LEAF(__strlen_\func\()_asm)
FEXPORT(__strlen_\func\()_nocheck_asm)
move v0, a0
.ifeqs "\func", "kernel"
1: EX(lbu, v1, (v0), .Lfault\@)
.else
1: EX(lbue, v1, (v0), .Lfault\@)
.endif
PTR_ADDIU v0, 1
bnez v1, 1b
PTR_SUBU v0, a0
@ -41,4 +45,20 @@ FEXPORT(__strlen_\func\()_nocheck_asm)
jr ra
.endm
#ifndef CONFIG_EVA
/* Set aliases */
.global __strlen_user_asm
.global __strlen_user_nocheck_asm
.set __strlen_user_asm, __strlen_kernel_asm
.set __strlen_user_nocheck_asm, __strlen_kernel_nocheck_asm
#endif
__BUILD_STRLEN_ASM kernel
#ifdef CONFIG_EVA
.set push
.set eva
__BUILD_STRLEN_ASM user
.set pop
#endif