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stddef.h: fix zeroptr's definition

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As Aaron pointed out, the old definition made the compiler emit two
memory accesses, to 0 (for derefencing) and then reading at whatever
address could be read from there.

Change-Id: I5cdd53f5bd2d2397c43f09f3e5fa46be08744b01
Found-by: Aaron Durbin <adurbin@chromium.org>
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-on: https://review.coreboot.org/14342
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
This commit is contained in:
Patrick Georgi 2016-04-13 18:51:12 +02:00 committed by Martin Roth
parent b3ee03c404
commit c42b786485
1 changed files with 1 additions and 1 deletions
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src/include/stddef.h
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@ -39,7 +39,7 @@ typedef unsigned int wint_t;
* undefined behaviour and do whatever" trickery in compilers. * undefined behaviour and do whatever" trickery in compilers.
* Use when you _really_ need to read32(zeroptr) (ie. read address 0). * Use when you _really_ need to read32(zeroptr) (ie. read address 0).
*/ */
extern void *zeroptr; extern char zeroptr[];
#endif #endif
#endif /* STDDEF_H */ #endif /* STDDEF_H */