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| author | Leonid Yegoshin <Leonid.Yegoshin@imgtec.com> | 2014-11-14 12:55:50 +0100 |
|---|---|---|
| committer | Markos Chandras <markos.chandras@imgtec.com> | 2015-02-17 16:37:29 +0100 |
| commit | b0ce4bd535a68e5814b8470f1f8a49771f37b0a2 (patch) | |
| tree | 3ffd6805a81c1b5e36a027cb26587fde3ac52e84 /arch/mips/lib/memcpy.S | |
| parent | MIPS: kernel: syscall: Set the appropriate ISA level for MIPS R6 (diff) | |
| download | linux-b0ce4bd535a68e5814b8470f1f8a49771f37b0a2.tar.xz linux-b0ce4bd535a68e5814b8470f1f8a49771f37b0a2.zip | |
MIPS: lib: memcpy: Add MIPS R6 support
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>
Diffstat (limited to 'arch/mips/lib/memcpy.S')
| -rw-r--r-- | arch/mips/lib/memcpy.S | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/arch/mips/lib/memcpy.S b/arch/mips/lib/memcpy.S index 5d3238af9b5c..9245e1705e69 100644 --- a/arch/mips/lib/memcpy.S +++ b/arch/mips/lib/memcpy.S @@ -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 |