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MIPS: lib: strncpy_user: Use macro to build the strncpy_from_user symbol

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Build the __strncpy_from_user symbol using a macro. In EVA mode we will
need to use similar code to do the userspace load operations so
it is better if we use a macro to avoid code duplications.

Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
This commit is contained in:
Markos Chandras 2014-01-02 16:36:49 +00:00 committed by Ralf Baechle
parent 053970542f
commit cc59fe5b88
1 changed files with 13 additions and 8 deletions
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21
arch/mips/lib/strncpy_user.S
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@ -28,16 +28,17 @@
* it happens at most some bytes of the exceptions handlers will be copied.
*/
LEAF(__strncpy_from_user_asm)
.macro __BUILD_STRNCPY_ASM func
LEAF(__strncpy_from_\func\()_asm)
LONG_L v0, TI_ADDR_LIMIT($28) # pointer ok?
and v0, a1
bnez v0, .Lfault
bnez v0, .Lfault\@
FEXPORT(__strncpy_from_user_nocheck_asm)
FEXPORT(__strncpy_from_\func\()_nocheck_asm)
.set noreorder
move t0, zero
move v1, a1
1: EX(lbu, v0, (v1), .Lfault)
1: EX(lbu, v0, (v1), .Lfault\@)
PTR_ADDIU v1, 1
R10KCBARRIER(0(ra))
beqz v0, 2f
@ -47,15 +48,19 @@ FEXPORT(__strncpy_from_user_nocheck_asm)
PTR_ADDIU a0, 1
2: PTR_ADDU v0, a1, t0
xor v0, a1
bltz v0, .Lfault
bltz v0, .Lfault\@
nop
jr ra # return n
move v0, t0
END(__strncpy_from_user_asm)
END(__strncpy_from_\func\()_asm)
.Lfault: jr ra
.Lfault\@: jr ra
li v0, -EFAULT
.section __ex_table,"a"
PTR 1b, .Lfault
PTR 1b, .Lfault\@
.previous
.endm
__BUILD_STRNCPY_ASM user