On Thu, Oct 15, 2015 at 07:52:56AM +0200, H. Nikolaus Schaller wrote:
> If the host toolchain is not glibc based then the arm kernel build
> fails with
>
> HOSTCC arch/arm/vdso/vdsomunge
> arch/arm/vdso/vdsomunge.c:48:22: fatal error: byteswap.h: No such file or
> directory
>
> Observed: with omap2plus_defconfig and compile on Mac OS X with arm ELF
> cross-compiler.
>
> Reason: byteswap.h is a glibc only header.
>
> Solution: replace by private byte-swapping macros (taken from
> arch/mips/boot/elf2ecoff.c)
>
> Tested to compile on Mac OS X 10.9.5 host.
>
> Signed-off-by: H. Nikolaus Schaller <h...@goldelico.com>
> ---
> arch/arm/vdso/vdsomunge.c | 19 +++++++++++++++----
> 1 file changed, 15 insertions(+), 4 deletions(-)
>
> diff --git a/arch/arm/vdso/vdsomunge.c b/arch/arm/vdso/vdsomunge.c
> index aedec81..513f9eb 100644
> --- a/arch/arm/vdso/vdsomunge.c
> +++ b/arch/arm/vdso/vdsomunge.c
> @@ -45,7 +45,6 @@
> * it does.
> */
>
> -#include <byteswap.h>
> #include <elf.h>
> #include <errno.h>
> #include <fcntl.h>
> @@ -59,6 +58,18 @@
> #include <sys/types.h>
> #include <unistd.h>
>
> +#define swab16(x) \
> + ((unsigned short)( \
> + (((unsigned short)(x) & (unsigned short)0x00ffU) << 8) | \
> + (((unsigned short)(x) & (unsigned short)0xff00U) >> 8)))
((((x) & 0x00ff) << 8) | \
(((x) & 0xff00) >> 8))
> +
> +#define swab32(x) \
> + ((unsigned int)( \
> + (((unsigned int)(x) & (unsigned int)0x000000ffUL) << 24) | \
> + (((unsigned int)(x) & (unsigned int)0x0000ff00UL) << 8) | \
> + (((unsigned int)(x) & (unsigned int)0x00ff0000UL) >> 8) | \
> + (((unsigned int)(x) & (unsigned int)0xff000000UL) >> 24)))
((((x) & 0x000000ff) << 24) | \
(((x) & 0x0000ff00) << 8) | \
(((x) & 0x00ff0000) >> 8) | \
(((x) & 0xff000000) << 24))
We can get rid of all the casts because we know what size 'x' is in
both cases.
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