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author | Marc Kleine-Budde <mkl@pengutronix.de> | 2010-02-04 13:13:44 +0100 |
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committer | Marc Kleine-Budde <mkl@pengutronix.de> | 2010-02-16 21:49:33 +0100 |
commit | 8beeb199d7e741776e659e120e1d84d98c3de996 (patch) | |
tree | 32af6cbddbb9e1daad4229fda16da0007f2e212e /include/linux/compiler-gcc.h | |
parent | 9762ce53b2c965c31234a1bfd9c2d55175da8d4c (diff) | |
download | barebox-8beeb199d7e741776e659e120e1d84d98c3de996.tar.gz barebox-8beeb199d7e741776e659e120e1d84d98c3de996.tar.xz |
import recent include/linux/compiler*.h
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Diffstat (limited to 'include/linux/compiler-gcc.h')
-rw-r--r-- | include/linux/compiler-gcc.h | 30 |
1 files changed, 27 insertions, 3 deletions
diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h index 5c8351b859..73dcf804bc 100644 --- a/include/linux/compiler-gcc.h +++ b/include/linux/compiler-gcc.h @@ -11,9 +11,19 @@ /* The "volatile" is due to gcc bugs */ #define barrier() __asm__ __volatile__("": : :"memory") -/* This macro obfuscates arithmetic on a variable address so that gcc - shouldn't recognize the original var, and make assumptions about it */ /* + * This macro obfuscates arithmetic on a variable address so that gcc + * shouldn't recognize the original var, and make assumptions about it. + * + * This is needed because the C standard makes it undefined to do + * pointer arithmetic on "objects" outside their boundaries and the + * gcc optimizers assume this is the case. In particular they + * assume such arithmetic does not wrap. + * + * A miscompilation has been observed because of this on PPC. + * To work around it we hide the relationship of the pointer and the object + * using this macro. + * * Versions of the ppc64 compiler before 4.1 had a bug where use of * RELOC_HIDE could trash r30. The bug can be worked around by changing * the inline assembly constraint from =g to =r, in this particular @@ -42,7 +52,15 @@ #define __deprecated __attribute__((deprecated)) #define __packed __attribute__((packed)) #define __weak __attribute__((weak)) -#define __naked __attribute__((naked)) + +/* + * it doesn't make sense on ARM (currently the only user of __naked) to trace + * naked functions because then mcount is called without stack and frame pointer + * being set up and there is no chance to restore the lr register to the value + * before mcount was called. + */ +#define __naked __attribute__((naked)) notrace + #define __noreturn __attribute__((noreturn)) /* @@ -61,3 +79,9 @@ #define noinline __attribute__((noinline)) #define __attribute_const__ __attribute__((__const__)) #define __maybe_unused __attribute__((unused)) +#define __always_unused __attribute__((unused)) + +#define __gcc_header(x) #x +#define _gcc_header(x) __gcc_header(linux/compiler-gcc##x.h) +#define gcc_header(x) _gcc_header(x) +#include gcc_header(__GNUC__) |