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| author | H. Peter Anvin <hpa@zytor.com> | 2006-06-19 15:35:36 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2006-06-19 15:35:36 +0100 |
| commit | 441ff855f3edf5d355bea30f557bbed6bcd42c6c (patch) | |
| tree | 6327490a1106630deb7fc20255c61072c85a943f /include/asm-arm/byteorder.h | |
| parent | 5e6423871772b89120c9fb356d2eabb67fea60bd (diff) | |
| download | linux-441ff855f3edf5d355bea30f557bbed6bcd42c6c.tar.gz linux-441ff855f3edf5d355bea30f557bbed6bcd42c6c.tar.bz2 linux-441ff855f3edf5d355bea30f557bbed6bcd42c6c.zip | |
[ARM] Fix byte order macros for Thumb
The byte order functions are visible to userspace. Unfortunately,
__arch_swab32() contains an assembly instruction which is invalid when
compiling for Thumb. This reverts to the C version when compiling for
Thumb.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'include/asm-arm/byteorder.h')
| -rw-r--r-- | include/asm-arm/byteorder.h | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/include/asm-arm/byteorder.h b/include/asm-arm/byteorder.h index 17eaf8bdf092..e6f7fcdc73b0 100644 --- a/include/asm-arm/byteorder.h +++ b/include/asm-arm/byteorder.h @@ -22,16 +22,18 @@ static inline __attribute_const__ __u32 ___arch__swab32(__u32 x) { __u32 t; - if (__builtin_constant_p(x)) { - t = x ^ ((x << 16) | (x >> 16)); /* eor r1,r0,r0,ror #16 */ - } else { +#ifndef __thumb__ + if (!__builtin_constant_p(x)) { /* * The compiler needs a bit of a hint here to always do the * right thing and not screw it up to different degrees * depending on the gcc version. */ asm ("eor\t%0, %1, %1, ror #16" : "=r" (t) : "r" (x)); - } + } else +#endif + t = x ^ ((x << 16) | (x >> 16)); /* eor r1,r0,r0,ror #16 */ + x = (x << 24) | (x >> 8); /* mov r0,r0,ror #8 */ t &= ~0x00FF0000; /* bic r1,r1,#0x00FF0000 */ x ^= (t >> 8); /* eor r0,r0,r1,lsr #8 */ |