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MIPS: lib: strnlen_user: Add EVA support

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In non-EVA mode, a strlen_user* alias is used for the
strlen_kernel* symbols since the code is identical. In EVA
mode, a new strlen_user* symbol is used which uses 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 2013-12-09 15:28:10 +00:00 • committed by Ralf Baechle
parent c48be43eb5
commit 4968db4b9c
2 changed files with 24 additions and 0 deletions
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4
arch/mips/kernel/mips_ksyms.c
View file

@ -22,6 +22,8 @@ extern long __strncpy_from_user_asm(char *__to, const char *__from,
long __len); long __len);
extern long __strlen_user_nocheck_asm(const char *s); extern long __strlen_user_nocheck_asm(const char *s);
extern long __strlen_user_asm(const char *s); extern long __strlen_user_asm(const char *s);
extern long __strnlen_kernel_nocheck_asm(const char *s);
extern long __strnlen_kernel_asm(const char *s);
extern long __strnlen_user_nocheck_asm(const char *s); extern long __strnlen_user_nocheck_asm(const char *s);
extern long __strnlen_user_asm(const char *s); extern long __strnlen_user_asm(const char *s);
@ -48,6 +50,8 @@ EXPORT_SYMBOL(__strncpy_from_user_nocheck_asm);
EXPORT_SYMBOL(__strncpy_from_user_asm); EXPORT_SYMBOL(__strncpy_from_user_asm);
EXPORT_SYMBOL(__strlen_user_nocheck_asm); EXPORT_SYMBOL(__strlen_user_nocheck_asm);
EXPORT_SYMBOL(__strlen_user_asm); EXPORT_SYMBOL(__strlen_user_asm);
EXPORT_SYMBOL(__strnlen_kernel_nocheck_asm);
EXPORT_SYMBOL(__strnlen_kernel_asm);
EXPORT_SYMBOL(__strnlen_user_nocheck_asm); EXPORT_SYMBOL(__strnlen_user_nocheck_asm);
EXPORT_SYMBOL(__strnlen_user_asm); EXPORT_SYMBOL(__strnlen_user_asm);

20
arch/mips/lib/strnlen_user.S
View file

@ -35,7 +35,11 @@ FEXPORT(__strnlen_\func\()_nocheck_asm)
move v0, a0 move v0, a0
PTR_ADDU a1, a0 # stop pointer PTR_ADDU a1, a0 # stop pointer
1: beq v0, a1, 1f # limit reached? 1: beq v0, a1, 1f # limit reached?
.ifeqs "\func", "kernel"
EX(lb, t0, (v0), .Lfault\@) EX(lb, t0, (v0), .Lfault\@)
.else
EX(lbe, t0, (v0), .Lfault\@)
.endif
PTR_ADDIU v0, 1 PTR_ADDIU v0, 1
bnez t0, 1b bnez t0, 1b
1: PTR_SUBU v0, a0 1: PTR_SUBU v0, a0
@ -47,4 +51,20 @@ FEXPORT(__strnlen_\func\()_nocheck_asm)
jr ra jr ra
.endm .endm
#ifndef CONFIG_EVA
/* Set aliases */
.global __strnlen_user_asm
.global __strnlen_user_nocheck_asm
.set __strnlen_user_asm, __strnlen_kernel_asm
.set __strnlen_user_nocheck_asm, __strnlen_kernel_nocheck_asm
#endif
__BUILD_STRNLEN_ASM kernel
#ifdef CONFIG_EVA
.set push
.set eva
__BUILD_STRNLEN_ASM user __BUILD_STRNLEN_ASM user
.set pop
#endif