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Commit b4b31f61 authored by Andy Lutomirski's avatar Andy Lutomirski Committed by H. Peter Anvin
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x86/vdso: Add PUT_LE to store little-endian values 



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

Signed-off-by: default avatarAndy Lutomirski <luto@amacapital.net>
Link: http://lkml.kernel.org/r/3d9b27e92745b27b6fda1b9a98f70dc9c1246c7a.1402620737.git.luto@amacapital.net


Signed-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
parent 4ebbefd6

arch/x86/vdso/vdso2c.c

+16 −3
Original line number Diff line number Diff line
@@ -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]))