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1 | #ifndef __LINUX_COMPILER_H |
2 | #error "Please don't include <linux/compiler-gcc.h> directly, include <linux/compiler.h> instead." |
3 | #endif |
4 | |
5 | /* |
6 | * Common definitions for all gcc versions go here. |
7 | */ |
8 | #define GCC_VERSION (__GNUC__ * 10000 \ |
9 | + __GNUC_MINOR__ * 100 \ |
10 | + __GNUC_PATCHLEVEL__) |
11 | |
12 | |
13 | /* Optimization barrier */ |
14 | /* The "volatile" is due to gcc bugs */ |
15 | #define barrier() __asm__ __volatile__("": : :"memory") |
16 | |
17 | /* |
18 | * This macro obfuscates arithmetic on a variable address so that gcc |
19 | * shouldn't recognize the original var, and make assumptions about it. |
20 | * |
21 | * This is needed because the C standard makes it undefined to do |
22 | * pointer arithmetic on "objects" outside their boundaries and the |
23 | * gcc optimizers assume this is the case. In particular they |
24 | * assume such arithmetic does not wrap. |
25 | * |
26 | * A miscompilation has been observed because of this on PPC. |
27 | * To work around it we hide the relationship of the pointer and the object |
28 | * using this macro. |
29 | * |
30 | * Versions of the ppc64 compiler before 4.1 had a bug where use of |
31 | * RELOC_HIDE could trash r30. The bug can be worked around by changing |
32 | * the inline assembly constraint from =g to =r, in this particular |
33 | * case either is valid. |
34 | */ |
35 | #define RELOC_HIDE(ptr, off) \ |
36 | ({ unsigned long __ptr; \ |
37 | __asm__ ("" : "=r"(__ptr) : "0"(ptr)); \ |
38 | (typeof(ptr)) (__ptr + (off)); }) |
39 | |
40 | #ifdef __CHECKER__ |
41 | #define __must_be_array(arr) 0 |
42 | #else |
43 | /* &a[0] degrades to a pointer: a different type from an array */ |
44 | #define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0])) |
45 | #endif |
46 | |
47 | /* |
48 | * Force always-inline if the user requests it so via the .config, |
49 | * or if gcc is too old: |
50 | */ |
51 | #if !defined(CONFIG_ARCH_SUPPORTS_OPTIMIZED_INLINING) || \ |
52 | !defined(CONFIG_OPTIMIZE_INLINING) || (__GNUC__ < 4) |
53 | # define inline inline __attribute__((always_inline)) notrace |
54 | # define __inline__ __inline__ __attribute__((always_inline)) notrace |
55 | # define __inline __inline __attribute__((always_inline)) notrace |
56 | #else |
57 | /* A lot of inline functions can cause havoc with function tracing */ |
58 | # define inline inline notrace |
59 | # define __inline__ __inline__ notrace |
60 | # define __inline __inline notrace |
61 | #endif |
62 | |
63 | #define __deprecated __attribute__((deprecated)) |
64 | #define __packed __attribute__((packed)) |
65 | #define __weak __attribute__((weak)) |
66 | |
67 | /* |
68 | * it doesn't make sense on ARM (currently the only user of __naked) to trace |
69 | * naked functions because then mcount is called without stack and frame pointer |
70 | * being set up and there is no chance to restore the lr register to the value |
71 | * before mcount was called. |
72 | * |
73 | * The asm() bodies of naked functions often depend on standard calling conventions, |
74 | * therefore they must be noinline and noclone. GCC 4.[56] currently fail to enforce |
75 | * this, so we must do so ourselves. See GCC PR44290. |
76 | */ |
77 | #define __naked __attribute__((naked)) noinline __noclone notrace |
78 | |
79 | #define __noreturn __attribute__((noreturn)) |
80 | |
81 | /* |
82 | * From the GCC manual: |
83 | * |
84 | * Many functions have no effects except the return value and their |
85 | * return value depends only on the parameters and/or global |
86 | * variables. Such a function can be subject to common subexpression |
87 | * elimination and loop optimization just as an arithmetic operator |
88 | * would be. |
89 | * [...] |
90 | */ |
91 | #define __pure __attribute__((pure)) |
92 | #define __aligned(x) __attribute__((aligned(x))) |
93 | #define __printf(a, b) __attribute__((format(printf, a, b))) |
94 | #define __scanf(a, b) __attribute__((format(scanf, a, b))) |
95 | #define noinline __attribute__((noinline)) |
96 | #define __attribute_const__ __attribute__((__const__)) |
97 | #define __maybe_unused __attribute__((unused)) |
98 | #define __always_unused __attribute__((unused)) |
99 | |
100 | #define __gcc_header(x) #x |
101 | #define _gcc_header(x) __gcc_header(linux/compiler-gcc##x.h) |
102 | #define gcc_header(x) _gcc_header(x) |
103 | #include gcc_header(__GNUC__) |
104 | |
105 | #if !defined(__noclone) |
106 | #define __noclone /* not needed */ |
107 | #endif |
108 | |
109 | /* |
110 | * A trick to suppress uninitialized variable warning without generating any |
111 | * code |
112 | */ |
113 | #define uninitialized_var(x) x = x |
114 | |
115 | #define __always_inline inline __attribute__((always_inline)) |
116 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
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v3.9