Subversion Repositories Kolibri OS

#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 __must_hold(x)	__attribute__((context(x,1,1)))

# 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 __must_hold(x)

# 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

/* Indirect macros required for expanded argument pasting, eg. __LINE__. */

#define ___PASTE(a,b) a##b

#define __PASTE(a,b) ___PASTE(a,b)

#ifdef __KERNEL__

#ifdef __GNUC__

#include 

#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 

#endif

/* Clang compiler defines __GNUC__. So we will overwrite implementations

 * coming from above header files here

 */

#ifdef __clang__

#include 

#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

#ifndef OPTIMIZER_HIDE_VAR

#define OPTIMIZER_HIDE_VAR(var) barrier()

#endif

/* Not-quite-unique ID. */

#ifndef __UNIQUE_ID

# define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __LINE__)

#endif

#include 

static __always_inline void data_access_exceeds_word_size(void)

#ifdef __compiletime_warning

__compiletime_warning("data access exceeds word size and won't be atomic")

#endif

;

static __always_inline void data_access_exceeds_word_size(void)

{

}

static __always_inline void __read_once_size(volatile void *p, void *res, int size)

{

	switch (size) {

	case 1: *(__u8 *)res = *(volatile __u8 *)p; break;

	case 2: *(__u16 *)res = *(volatile __u16 *)p; break;

	case 4: *(__u32 *)res = *(volatile __u32 *)p; break;

#ifdef CONFIG_64BIT

	case 8: *(__u64 *)res = *(volatile __u64 *)p; break;

#endif

	default:

		barrier();

		__builtin_memcpy((void *)res, (const void *)p, size);

		data_access_exceeds_word_size();

		barrier();

	}

}

static __always_inline void __assign_once_size(volatile void *p, void *res, int size)

{

	switch (size) {

	case 1: *(volatile __u8 *)p = *(__u8 *)res; break;

	case 2: *(volatile __u16 *)p = *(__u16 *)res; break;

	case 4: *(volatile __u32 *)p = *(__u32 *)res; break;

#ifdef CONFIG_64BIT

	case 8: *(volatile __u64 *)p = *(__u64 *)res; break;

#endif

	default:

		barrier();

		__builtin_memcpy((void *)p, (const void *)res, size);

		data_access_exceeds_word_size();

		barrier();

	}

}

/*

 * Prevent the compiler from merging or refetching reads or writes. The

 * compiler is also forbidden from reordering successive instances of

 * READ_ONCE, ASSIGN_ONCE and ACCESS_ONCE (see below), 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 READ_ONCE,

 * ASSIGN_ONCE or ACCESS_ONCE() in different C statements.

 *

 * In contrast to ACCESS_ONCE these two macros will also work on aggregate

 * data types like structs or unions. If the size of the accessed data

 * type exceeds the word size of the machine (e.g., 32 bits or 64 bits)

 * READ_ONCE() and ASSIGN_ONCE()  will fall back to memcpy and print a

 * compile-time warning.

 *

 * Their two major use cases are: (1) Mediating communication between

 * process-level code and irq/NMI handlers, all running on the same CPU,

 * and (2) Ensuring that the compiler does not  fold, spindle, or otherwise

 * mutilate accesses that either do not require ordering or that interact

 * with an explicit memory barrier or atomic instruction that provides the

 * required ordering.

 */

#define READ_ONCE(x) \

	({ typeof(x) __val; __read_once_size(&x, &__val, sizeof(__val)); __val; })

#define ASSIGN_ONCE(val, x) \

	({ typeof(x) __val; __val = val; __assign_once_size(&x, &__val, sizeof(__val)); __val; })

#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

#ifndef __visible

#define __visible

#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

/* Is this type a native word size -- useful for atomic operations */

#ifndef __native_word

# define __native_word(t) (sizeof(t) == sizeof(int) || sizeof(t) == sizeof(long))

#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)

/*

 * Sparse complains of variable sized arrays due to the temporary variable in

 * __compiletime_assert. Unfortunately we can't just expand it out to make

 * sparse see a constant array size without breaking compiletime_assert on old

 * versions of GCC (e.g. 4.2.4), so hide the array from sparse altogether.

 */

# ifndef __CHECKER__

# define __compiletime_error_fallback(condition) \

	do { ((void)sizeof(char[1 - 2 * condition])); } while (0)

# endif

#endif

#ifndef __compiletime_error_fallback

# define __compiletime_error_fallback(condition) do { } while (0)

#endif

#define __compiletime_assert(condition, msg, prefix, suffix)		\

	do {								\

		bool __cond = !(condition);				\

		extern void prefix ## suffix(void) __compiletime_error(msg); \

		if (__cond)						\

			prefix ## suffix();				\

		__compiletime_error_fallback(__cond);			\

	} while (0)

#define _compiletime_assert(condition, msg, prefix, suffix) \

	__compiletime_assert(condition, msg, prefix, suffix)

/**

 * compiletime_assert - break build and emit msg if condition is false

 * @condition: a compile-time constant condition to check

 * @msg:       a message to emit if condition is false

 *

 * In tradition of POSIX assert, this macro will break the build if the

 * supplied condition is *false*, emitting the supplied error message if the

 * compiler has support to do so.

 */

#define compiletime_assert(condition, msg) \

	_compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)

#define compiletime_assert_atomic_type(t)				\

	compiletime_assert(__native_word(t),				\

		"Need native word sized stores/loads for atomicity.")

/*

 * 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))

/* Ignore/forbid kprobes attach on very low level functions marked by this attribute: */

#ifdef CONFIG_KPROBES

# define __kprobes	__attribute__((__section__(".kprobes.text")))

# define nokprobe_inline	__always_inline

#else

# define __kprobes

# define nokprobe_inline	inline

#endif

#endif /* __LINUX_COMPILER_H */