314 lines
8.5 KiB
C
314 lines
8.5 KiB
C
#ifndef __LINUX_COMPILER_H
|
|
#define __LINUX_COMPILER_H
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
#ifdef __CHECKER__
|
|
# define __user __attribute__((noderef, address_space(1)))
|
|
# define __kernel __attribute__((address_space(0)))
|
|
# define __safe __attribute__((safe))
|
|
# define __force __attribute__((force))
|
|
# define __nocast __attribute__((nocast))
|
|
# define __iomem __attribute__((noderef, address_space(2)))
|
|
# define __acquires(x) __attribute__((context(x,0,1)))
|
|
# define __releases(x) __attribute__((context(x,1,0)))
|
|
# define __acquire(x) __context__(x,1)
|
|
# define __release(x) __context__(x,-1)
|
|
# define __cond_lock(x,c) ((c) ? ({ __acquire(x); 1; }) : 0)
|
|
# define __percpu __attribute__((noderef, address_space(3)))
|
|
#ifdef CONFIG_SPARSE_RCU_POINTER
|
|
# define __rcu __attribute__((noderef, address_space(4)))
|
|
#else
|
|
# define __rcu
|
|
#endif
|
|
extern void __chk_user_ptr(const volatile void __user *);
|
|
extern void __chk_io_ptr(const volatile void __iomem *);
|
|
#else
|
|
# define __user
|
|
# define __kernel
|
|
# define __safe
|
|
# define __force
|
|
# define __nocast
|
|
# define __iomem
|
|
# define __chk_user_ptr(x) (void)0
|
|
# define __chk_io_ptr(x) (void)0
|
|
# define __builtin_warning(x, y...) (1)
|
|
# define __acquires(x)
|
|
# define __releases(x)
|
|
# define __acquire(x) (void)0
|
|
# define __release(x) (void)0
|
|
# define __cond_lock(x,c) (c)
|
|
# define __percpu
|
|
# define __rcu
|
|
#endif
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#ifdef __GNUC__
|
|
#include <linux/compiler-gcc.h>
|
|
#endif
|
|
|
|
#define notrace __attribute__((no_instrument_function))
|
|
|
|
/* Intel compiler defines __GNUC__. So we will overwrite implementations
|
|
* coming from above header files here
|
|
*/
|
|
#ifdef __INTEL_COMPILER
|
|
# include <linux/compiler-intel.h>
|
|
#endif
|
|
|
|
/*
|
|
* Generic compiler-dependent macros required for kernel
|
|
* build go below this comment. Actual compiler/compiler version
|
|
* specific implementations come from the above header files
|
|
*/
|
|
|
|
struct ftrace_branch_data {
|
|
const char *func;
|
|
const char *file;
|
|
unsigned line;
|
|
union {
|
|
struct {
|
|
unsigned long correct;
|
|
unsigned long incorrect;
|
|
};
|
|
struct {
|
|
unsigned long miss;
|
|
unsigned long hit;
|
|
};
|
|
unsigned long miss_hit[2];
|
|
};
|
|
};
|
|
|
|
/*
|
|
* Note: DISABLE_BRANCH_PROFILING can be used by special lowlevel code
|
|
* to disable branch tracing on a per file basis.
|
|
*/
|
|
#if defined(CONFIG_TRACE_BRANCH_PROFILING) \
|
|
&& !defined(DISABLE_BRANCH_PROFILING) && !defined(__CHECKER__)
|
|
void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect);
|
|
|
|
#define likely_notrace(x) __builtin_expect(!!(x), 1)
|
|
#define unlikely_notrace(x) __builtin_expect(!!(x), 0)
|
|
|
|
#define __branch_check__(x, expect) ({ \
|
|
int ______r; \
|
|
static struct ftrace_branch_data \
|
|
__attribute__((__aligned__(4))) \
|
|
__attribute__((section("_ftrace_annotated_branch"))) \
|
|
______f = { \
|
|
.func = __func__, \
|
|
.file = __FILE__, \
|
|
.line = __LINE__, \
|
|
}; \
|
|
______r = likely_notrace(x); \
|
|
ftrace_likely_update(&______f, ______r, expect); \
|
|
______r; \
|
|
})
|
|
|
|
/*
|
|
* Using __builtin_constant_p(x) to ignore cases where the return
|
|
* value is always the same. This idea is taken from a similar patch
|
|
* written by Daniel Walker.
|
|
*/
|
|
# ifndef likely
|
|
# define likely(x) (__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 1))
|
|
# endif
|
|
# ifndef unlikely
|
|
# define unlikely(x) (__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 0))
|
|
# endif
|
|
|
|
#ifdef CONFIG_PROFILE_ALL_BRANCHES
|
|
/*
|
|
* "Define 'is'", Bill Clinton
|
|
* "Define 'if'", Steven Rostedt
|
|
*/
|
|
#define if(cond, ...) __trace_if( (cond , ## __VA_ARGS__) )
|
|
#define __trace_if(cond) \
|
|
if (__builtin_constant_p((cond)) ? !!(cond) : \
|
|
({ \
|
|
int ______r; \
|
|
static struct ftrace_branch_data \
|
|
__attribute__((__aligned__(4))) \
|
|
__attribute__((section("_ftrace_branch"))) \
|
|
______f = { \
|
|
.func = __func__, \
|
|
.file = __FILE__, \
|
|
.line = __LINE__, \
|
|
}; \
|
|
______r = !!(cond); \
|
|
______f.miss_hit[______r]++; \
|
|
______r; \
|
|
}))
|
|
#endif /* CONFIG_PROFILE_ALL_BRANCHES */
|
|
|
|
#else
|
|
# define likely(x) __builtin_expect(!!(x), 1)
|
|
# define unlikely(x) __builtin_expect(!!(x), 0)
|
|
#endif
|
|
|
|
/* Optimization barrier */
|
|
#ifndef barrier
|
|
# define barrier() __memory_barrier()
|
|
#endif
|
|
|
|
/* Unreachable code */
|
|
#ifndef unreachable
|
|
# define unreachable() do { } while (1)
|
|
#endif
|
|
|
|
#ifndef RELOC_HIDE
|
|
# define RELOC_HIDE(ptr, off) \
|
|
({ unsigned long __ptr; \
|
|
__ptr = (unsigned long) (ptr); \
|
|
(typeof(ptr)) (__ptr + (off)); })
|
|
#endif
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* __ASSEMBLY__ */
|
|
|
|
#ifdef __KERNEL__
|
|
/*
|
|
* Allow us to mark functions as 'deprecated' and have gcc emit a nice
|
|
* warning for each use, in hopes of speeding the functions removal.
|
|
* Usage is:
|
|
* int __deprecated foo(void)
|
|
*/
|
|
#ifndef __deprecated
|
|
# define __deprecated /* unimplemented */
|
|
#endif
|
|
|
|
#ifdef MODULE
|
|
#define __deprecated_for_modules __deprecated
|
|
#else
|
|
#define __deprecated_for_modules
|
|
#endif
|
|
|
|
#ifndef __must_check
|
|
#define __must_check
|
|
#endif
|
|
|
|
#ifndef CONFIG_ENABLE_MUST_CHECK
|
|
#undef __must_check
|
|
#define __must_check
|
|
#endif
|
|
#ifndef CONFIG_ENABLE_WARN_DEPRECATED
|
|
#undef __deprecated
|
|
#undef __deprecated_for_modules
|
|
#define __deprecated
|
|
#define __deprecated_for_modules
|
|
#endif
|
|
|
|
/*
|
|
* Allow us to avoid 'defined but not used' warnings on functions and data,
|
|
* as well as force them to be emitted to the assembly file.
|
|
*
|
|
* As of gcc 3.4, static functions that are not marked with attribute((used))
|
|
* may be elided from the assembly file. As of gcc 3.4, static data not so
|
|
* marked will not be elided, but this may change in a future gcc version.
|
|
*
|
|
* NOTE: Because distributions shipped with a backported unit-at-a-time
|
|
* compiler in gcc 3.3, we must define __used to be __attribute__((used))
|
|
* for gcc >=3.3 instead of 3.4.
|
|
*
|
|
* In prior versions of gcc, such functions and data would be emitted, but
|
|
* would be warned about except with attribute((unused)).
|
|
*
|
|
* Mark functions that are referenced only in inline assembly as __used so
|
|
* the code is emitted even though it appears to be unreferenced.
|
|
*/
|
|
#ifndef __used
|
|
# define __used /* unimplemented */
|
|
#endif
|
|
|
|
#ifndef __maybe_unused
|
|
# define __maybe_unused /* unimplemented */
|
|
#endif
|
|
|
|
#ifndef __always_unused
|
|
# define __always_unused /* unimplemented */
|
|
#endif
|
|
|
|
#ifndef noinline
|
|
#define noinline
|
|
#endif
|
|
|
|
/*
|
|
* Rather then using noinline to prevent stack consumption, use
|
|
* noinline_for_stack instead. For documentation reasons.
|
|
*/
|
|
#define noinline_for_stack noinline
|
|
|
|
#ifndef __always_inline
|
|
#define __always_inline inline
|
|
#endif
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
/*
|
|
* From the GCC manual:
|
|
*
|
|
* Many functions do not examine any values except their arguments,
|
|
* and have no effects except the return value. Basically this is
|
|
* just slightly more strict class than the `pure' attribute above,
|
|
* since function is not allowed to read global memory.
|
|
*
|
|
* Note that a function that has pointer arguments and examines the
|
|
* data pointed to must _not_ be declared `const'. Likewise, a
|
|
* function that calls a non-`const' function usually must not be
|
|
* `const'. It does not make sense for a `const' function to return
|
|
* `void'.
|
|
*/
|
|
#ifndef __attribute_const__
|
|
# define __attribute_const__ /* unimplemented */
|
|
#endif
|
|
|
|
/*
|
|
* Tell gcc if a function is cold. The compiler will assume any path
|
|
* directly leading to the call is unlikely.
|
|
*/
|
|
|
|
#ifndef __cold
|
|
#define __cold
|
|
#endif
|
|
|
|
/* Simple shorthand for a section definition */
|
|
#ifndef __section
|
|
# define __section(S) __attribute__ ((__section__(#S)))
|
|
#endif
|
|
|
|
/* Are two types/vars the same type (ignoring qualifiers)? */
|
|
#ifndef __same_type
|
|
# define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))
|
|
#endif
|
|
|
|
/* Compile time object size, -1 for unknown */
|
|
#ifndef __compiletime_object_size
|
|
# define __compiletime_object_size(obj) -1
|
|
#endif
|
|
#ifndef __compiletime_warning
|
|
# define __compiletime_warning(message)
|
|
#endif
|
|
#ifndef __compiletime_error
|
|
# define __compiletime_error(message)
|
|
#endif
|
|
#ifndef __linktime_error
|
|
# define __linktime_error(message)
|
|
#endif
|
|
/*
|
|
* Prevent the compiler from merging or refetching accesses. The compiler
|
|
* is also forbidden from reordering successive instances of ACCESS_ONCE(),
|
|
* but only when the compiler is aware of some particular ordering. One way
|
|
* to make the compiler aware of ordering is to put the two invocations of
|
|
* ACCESS_ONCE() in different C statements.
|
|
*
|
|
* This macro does absolutely -nothing- to prevent the CPU from reordering,
|
|
* merging, or refetching absolutely anything at any time. Its main intended
|
|
* use is to mediate communication between process-level code and irq/NMI
|
|
* handlers, all running on the same CPU.
|
|
*/
|
|
#define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x))
|
|
|
|
#endif /* __LINUX_COMPILER_H */
|