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x86/vdso: Add PUT_LE to store little-endian values

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Add PUT_LE() by analogy with GET_LE() to write littleendian values in
addition to reading them.

Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Link: http://lkml.kernel.org/r/3d9b27e92745b27b6fda1b9a98f70dc9c1246c7a.1402620737.git.luto@amacapital.net
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
Andy Lutomirski 2014-06-12 17:53:11 -07:00 committed by H. Peter Anvin
parent 4ebbefd6b9
commit b4b31f6101
1 changed files with 16 additions and 3 deletions
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19
arch/x86/vdso/vdso2c.c
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@ -54,7 +54,7 @@ static void fail(const char *format, ...)
}
/*
* Evil macros to do a little-endian read.
* Evil macros for little-endian reads and writes
*/
#define GLE(x, bits, ifnot) \
__builtin_choose_expr( \
@ -62,11 +62,24 @@ static void fail(const char *format, ...)
(__typeof__(*(x)))get_unaligned_le##bits(x), ifnot)
extern void bad_get_le(void);
#define LAST_LE(x) \
#define LAST_GLE(x) \
__builtin_choose_expr(sizeof(*(x)) == 1, *(x), bad_get_le())
#define GET_LE(x) \
GLE(x, 64, GLE(x, 32, GLE(x, 16, LAST_LE(x))))
GLE(x, 64, GLE(x, 32, GLE(x, 16, LAST_GLE(x))))
#define PLE(x, val, bits, ifnot) \
__builtin_choose_expr( \
(sizeof(*(x)) == bits/8), \
put_unaligned_le##bits((val), (x)), ifnot)
extern void bad_put_le(void);
#define LAST_PLE(x, val) \
__builtin_choose_expr(sizeof(*(x)) == 1, *(x) = (val), bad_put_le())
#define PUT_LE(x, val) \
PLE(x, val, 64, PLE(x, val, 32, PLE(x, val, 16, LAST_PLE(x, val))))
#define NSYMS (sizeof(required_syms) / sizeof(required_syms[0]))