0,0 → 1,87 |
#ifndef __LINUX_COMPILER_H |
#error "Please don't include <linux/compiler-gcc.h> directly, include <linux/compiler.h> instead." |
#endif |
|
/* |
* Common definitions for all gcc versions go here. |
*/ |
|
|
/* Optimization barrier */ |
/* 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 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 |
* case either is valid. |
*/ |
#define RELOC_HIDE(ptr, off) \ |
({ unsigned long __ptr; \ |
__asm__ ("" : "=r"(__ptr) : "0"(ptr)); \ |
(typeof(ptr)) (__ptr + (off)); }) |
|
/* &a[0] degrades to a pointer: a different type from an array */ |
#define __must_be_array(a) \ |
BUILD_BUG_ON_ZERO(__builtin_types_compatible_p(typeof(a), typeof(&a[0]))) |
|
/* |
* Force always-inline if the user requests it so via the .config, |
* or if gcc is too old: |
*/ |
#if !defined(CONFIG_ARCH_SUPPORTS_OPTIMIZED_INLINING) || \ |
!defined(CONFIG_OPTIMIZE_INLINING) || (__GNUC__ < 4) |
# define inline inline __attribute__((always_inline)) |
# define __inline__ __inline__ __attribute__((always_inline)) |
# define __inline __inline __attribute__((always_inline)) |
#endif |
|
#define __deprecated __attribute__((deprecated)) |
#define __packed __attribute__((packed)) |
#define __weak __attribute__((weak)) |
|
/* |
* 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)) |
|
/* |
* From the GCC manual: |
* |
* Many functions have no effects except the return value and their |
* return value depends only on the parameters and/or global |
* variables. Such a function can be subject to common subexpression |
* elimination and loop optimization just as an arithmetic operator |
* would be. |
* [...] |
*/ |
#define __pure __attribute__((pure)) |
#define __aligned(x) __attribute__((aligned(x))) |
#define __printf(a,b) __attribute__((format(printf,a,b))) |
#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__) |