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MIPS: lib: memcpy: Add MIPS R6 support

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MIPS R6 does not support the unaligned load and store instructions
so we add a special MIPS R6 case to copy one byte at a time if we
need to read/write to unaligned memory addresses.

Signed-off-by: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
This commit is contained in:
Leonid Yegoshin 2014-11-14 11:55:50 +00:00 committed by Markos Chandras
parent fee313d4b8
commit b0ce4bd535
1 changed files with 23 additions and 0 deletions
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23
arch/mips/lib/memcpy.S
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@ -293,9 +293,14 @@
and t0, src, ADDRMASK
PREFS( 0, 2*32(src) )
PREFD( 1, 2*32(dst) )
#ifndef CONFIG_CPU_MIPSR6
bnez t1, .Ldst_unaligned\@
nop
bnez t0, .Lsrc_unaligned_dst_aligned\@
#else
or t0, t0, t1
bnez t0, .Lcopy_unaligned_bytes\@
#endif
/*
* use delay slot for fall-through
* src and dst are aligned; need to compute rem
@ -376,6 +381,7 @@
bne rem, len, 1b
.set noreorder
#ifndef CONFIG_CPU_MIPSR6
/*
* src and dst are aligned, need to copy rem bytes (rem < NBYTES)
* A loop would do only a byte at a time with possible branch
@ -477,6 +483,7 @@
bne len, rem, 1b
.set noreorder
#endif /* !CONFIG_CPU_MIPSR6 */
.Lcopy_bytes_checklen\@:
beqz len, .Ldone\@
nop
@ -504,6 +511,22 @@
.Ldone\@:
jr ra
nop
#ifdef CONFIG_CPU_MIPSR6
.Lcopy_unaligned_bytes\@:
1:
COPY_BYTE(0)
COPY_BYTE(1)
COPY_BYTE(2)
COPY_BYTE(3)
COPY_BYTE(4)
COPY_BYTE(5)
COPY_BYTE(6)
COPY_BYTE(7)
ADD src, src, 8
b 1b
ADD dst, dst, 8
#endif /* CONFIG_CPU_MIPSR6 */
.if __memcpy == 1
END(memcpy)
.set __memcpy, 0