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MIPS: __strncpy_from_user_asm CPU_DADDI_WORKAROUNDS bug fix

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This corrects assembler warnings and broken code generated in
__strncpy_from_user_asm:

arch/mips/lib/strncpy_user.S: Assembler messages:
arch/mips/lib/strncpy_user.S:52: Warning: Macro instruction expanded into
multiple instructions in a branch delay slot

with the CPU_DADDI_WORKAROUNDS option set.  The function schedules delay
slots manually where there is really no need to as GAS is happy to do it
all itself, so undo it all and remove `.set noreorder'.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/6685/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Maciej W. Rozycki 2014-04-04 03:32:29 +01:00 committed by Ralf Baechle
parent 2db4bc3418
commit 465ca5d6a0
1 changed files with 6 additions and 7 deletions
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13
arch/mips/lib/strncpy_user.S
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@ -35,7 +35,6 @@ LEAF(__strncpy_from_\func\()_asm)
bnez v0, .Lfault\@
FEXPORT(__strncpy_from_\func\()_nocheck_asm)
.set noreorder
move t0, zero
move v1, a1
.ifeqs "\func","kernel"
@ -45,21 +44,21 @@ FEXPORT(__strncpy_from_\func\()_nocheck_asm)
.endif
PTR_ADDIU v1, 1
R10KCBARRIER(0(ra))
sb v0, (a0)
beqz v0, 2f
sb v0, (a0)
PTR_ADDIU t0, 1
PTR_ADDIU a0, 1
bne t0, a2, 1b
PTR_ADDIU a0, 1
2: PTR_ADDU v0, a1, t0
xor v0, a1
bltz v0, .Lfault\@
nop
move v0, t0
jr ra # return n
move v0, t0
END(__strncpy_from_\func\()_asm)
.Lfault\@: jr ra
li v0, -EFAULT
.Lfault\@:
li v0, -EFAULT
jr ra
.section __ex_table,"a"
PTR 1b, .Lfault\@