linux_kernel/tools/perf/perf-sys.h

#ifndef _PERF_SYS_H
#define _PERF_SYS_H

#include <unistd.h>
#include <sys/types.h>
#include <sys/syscall.h>
#include <linux/types.h>
#include <linux/perf_event.h>
#include <asm/unistd.h>

#if defined(__i386__)
#define mb()		asm volatile("lock; addl $0,0(%%esp)" ::: "memory")
#define wmb()		asm volatile("lock; addl $0,0(%%esp)" ::: "memory")
#define rmb()		asm volatile("lock; addl $0,0(%%esp)" ::: "memory")
#define cpu_relax()	asm volatile("rep; nop" ::: "memory");
#define CPUINFO_PROC	"model name"
#ifndef __NR_perf_event_open
# define __NR_perf_event_open 336
#endif
#ifndef __NR_futex
# define __NR_futex 240
#endif
#ifndef __NR_gettid
# define __NR_gettid 224
#endif
#endif

#if defined(__x86_64__)
#define mb()		asm volatile("mfence" ::: "memory")
#define wmb()		asm volatile("sfence" ::: "memory")
#define rmb()		asm volatile("lfence" ::: "memory")
#define cpu_relax()	asm volatile("rep; nop" ::: "memory");
#define CPUINFO_PROC	"model name"
#ifndef __NR_perf_event_open
# define __NR_perf_event_open 298
#endif
#ifndef __NR_futex
# define __NR_futex 202
#endif
#ifndef __NR_gettid
# define __NR_gettid 186
#endif
#endif

#ifdef __powerpc__
#include "../../arch/powerpc/include/uapi/asm/unistd.h"
#define mb()		asm volatile ("sync" ::: "memory")
#define wmb()		asm volatile ("sync" ::: "memory")
#define rmb()		asm volatile ("sync" ::: "memory")
#define CPUINFO_PROC	"cpu"
#endif

#ifdef __s390__
#define mb()		asm volatile("bcr 15,0" ::: "memory")
#define wmb()		asm volatile("bcr 15,0" ::: "memory")
#define rmb()		asm volatile("bcr 15,0" ::: "memory")
#define CPUINFO_PROC	"vendor_id"
#endif

#ifdef __sh__
#if defined(__SH4A__) || defined(__SH5__)
# define mb()		asm volatile("synco" ::: "memory")
# define wmb()		asm volatile("synco" ::: "memory")
# define rmb()		asm volatile("synco" ::: "memory")
#else
# define mb()		asm volatile("" ::: "memory")
# define wmb()		asm volatile("" ::: "memory")
# define rmb()		asm volatile("" ::: "memory")
#endif
#define CPUINFO_PROC	"cpu type"
#endif

#ifdef __hppa__
#define mb()		asm volatile("" ::: "memory")
#define wmb()		asm volatile("" ::: "memory")
#define rmb()		asm volatile("" ::: "memory")
#define CPUINFO_PROC	"cpu"
#endif

#ifdef __sparc__
#ifdef __LP64__
#define mb()		asm volatile("ba,pt %%xcc, 1f\n"	\
				     "membar #StoreLoad\n"	\
				     "1:\n":::"memory")
#else
#define mb()		asm volatile("":::"memory")
#endif
#define wmb()		asm volatile("":::"memory")
#define rmb()		asm volatile("":::"memory")
#define CPUINFO_PROC	"cpu"
#endif

#ifdef __alpha__
#define mb()		asm volatile("mb" ::: "memory")
#define wmb()		asm volatile("wmb" ::: "memory")
#define rmb()		asm volatile("mb" ::: "memory")
#define CPUINFO_PROC	"cpu model"
#endif

#ifdef __ia64__
#define mb()		asm volatile ("mf" ::: "memory")
#define wmb()		asm volatile ("mf" ::: "memory")
#define rmb()		asm volatile ("mf" ::: "memory")
#define cpu_relax()	asm volatile ("hint @pause" ::: "memory")
#define CPUINFO_PROC	"model name"
#endif

#ifdef __arm__
/*
 * Use the __kuser_memory_barrier helper in the CPU helper page. See
 * arch/arm/kernel/entry-armv.S in the kernel source for details.
 */
#define mb()		((void(*)(void))0xffff0fa0)()
#define wmb()		((void(*)(void))0xffff0fa0)()
#define rmb()		((void(*)(void))0xffff0fa0)()
#define CPUINFO_PROC	"Processor"
#endif

#ifdef __aarch64__
#define mb()		asm volatile("dmb ish" ::: "memory")
#define wmb()		asm volatile("dmb ishst" ::: "memory")
#define rmb()		asm volatile("dmb ishld" ::: "memory")
#define cpu_relax()	asm volatile("yield" ::: "memory")
#endif

#ifdef __mips__
#define mb()		asm volatile(					\
				".set	mips2\n\t"			\
				"sync\n\t"				\
				".set	mips0"				\
				: /* no output */			\
				: /* no input */			\
				: "memory")
#define wmb()	mb()
#define rmb()	mb()
#define CPUINFO_PROC	"cpu model"
#endif

#ifdef __arc__
#define mb()		asm volatile("" ::: "memory")
#define wmb()		asm volatile("" ::: "memory")
#define rmb()		asm volatile("" ::: "memory")
#define CPUINFO_PROC	"Processor"
#endif

#ifdef __metag__
#define mb()		asm volatile("" ::: "memory")
#define wmb()		asm volatile("" ::: "memory")
#define rmb()		asm volatile("" ::: "memory")
#define CPUINFO_PROC	"CPU"
#endif

#ifdef __xtensa__
#define mb()		asm volatile("memw" ::: "memory")
#define wmb()		asm volatile("memw" ::: "memory")
#define rmb()		asm volatile("" ::: "memory")
#define CPUINFO_PROC	"core ID"
#endif

#ifdef __tile__
#define mb()		asm volatile ("mf" ::: "memory")
#define wmb()		asm volatile ("mf" ::: "memory")
#define rmb()		asm volatile ("mf" ::: "memory")
#define cpu_relax()	asm volatile ("mfspr zero, PASS" ::: "memory")
#define CPUINFO_PROC    "model name"
#endif

#define barrier() asm volatile ("" ::: "memory")

#ifndef cpu_relax
#define cpu_relax() barrier()
#endif

static inline int
sys_perf_event_open(struct perf_event_attr *attr,
		      pid_t pid, int cpu, int group_fd,
		      unsigned long flags)
{
	int fd;

	fd = syscall(__NR_perf_event_open, attr, pid, cpu,
		     group_fd, flags);

#ifdef HAVE_ATTR_TEST
	if (unlikely(test_attr__enabled))
		test_attr__open(attr, pid, cpu, fd, group_fd, flags);
#endif
	return fd;
}

#endif /* _PERF_SYS_H */