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MIPS: lib: strlen_user: Use macro to build the strlen_user symbol

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Build the __strlen_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 15:55:58 +00:00 committed by Ralf Baechle
parent 4968db4b9c
commit 5cc494972a
1 changed files with 10 additions and 6 deletions
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16
arch/mips/lib/strlen_user.S
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@ -22,19 +22,23 @@
*
* Return 0 for error
*/
LEAF(__strlen_user_asm)
.macro __BUILD_STRLEN_ASM func
LEAF(__strlen_\func\()_asm)
LONG_L v0, TI_ADDR_LIMIT($28) # pointer ok?
and v0, a0
bnez v0, .Lfault
bnez v0, .Lfault\@
FEXPORT(__strlen_user_nocheck_asm)
FEXPORT(__strlen_\func\()_nocheck_asm)
move v0, a0
1: EX(lbu, v1, (v0), .Lfault)
1: EX(lbu, v1, (v0), .Lfault\@)
PTR_ADDIU v0, 1
bnez v1, 1b
PTR_SUBU v0, a0
jr ra
END(__strlen_user_asm)
END(__strlen_\func\()_asm)
.Lfault: move v0, zero
.Lfault\@: move v0, zero
jr ra
.endm
__BUILD_STRLEN_ASM user