// using the GCC calling convention. It is implemented in assembly.
func callCgoMmap(addr unsafe.Pointer, n uintptr, prot, flags, fd int32, off uint32) uintptr

// sysMunmap calls the munmap system call. It is implemented in assembly.
func sysMunmap(addr unsafe.Pointer, n uintptr)

// callCgoMunmap calls the munmap function in the runtime/cgo package
// using the GCC calling convention. It is implemented in assembly.

		0xa0<<32, 3<<30, syscall.PROT_READ|syscall.PROT_WRITE, syscall.MAP_PRIVATE|syscall.MAP_ANONYMOUS, ^uintptr(0), 0)
	if errno != 0 {
		t.Skipf("could not create memory mapping: %s", errno)
	}
	syscall.Syscall(syscall.SYS_MUNMAP, base, 3<<30, 0)

	for off := uintptr(0); off < 3<<30; off += 65536 {
		_, _, errno := syscall.Syscall6(syscall.SYS_MMAP,

	SYS_GETSOCKOPT             = 209
	SYS_SHUTDOWN               = 210
	SYS_SENDMSG                = 211
	SYS_RECVMSG                = 212
	SYS_READAHEAD              = 213
	SYS_BRK                    = 214
	SYS_MUNMAP                 = 215
	SYS_MREMAP                 = 216
	SYS_ADD_KEY                = 217
	SYS_REQUEST_KEY            = 218
	SYS_KEYCTL                 = 219
	SYS_CLONE                  = 220

	SYS_GETSOCKOPT             = 209
	SYS_SHUTDOWN               = 210
	SYS_SENDMSG                = 211
	SYS_RECVMSG                = 212
	SYS_READAHEAD              = 213
	SYS_BRK                    = 214
	SYS_MUNMAP                 = 215
	SYS_MREMAP                 = 216
	SYS_ADD_KEY                = 217
	SYS_REQUEST_KEY            = 218
	SYS_KEYCTL                 = 219
	SYS_CLONE                  = 220

#define CLOCK_MONOTONIC		4

#define SYS_exit		1
#define SYS_read		3
#define SYS_write		4
#define SYS_open		5
#define SYS_close		6
#define SYS_getpid		20
#define SYS_kill		37
#define SYS_sigaltstack		53
#define SYS_munmap		73
#define SYS_madvise		75
#define SYS_setitimer		83
#define SYS_fcntl		92
#define SYS_sysarch		165
#define SYS___sysctl		202
#define SYS_clock_gettime	232
#define SYS_nanosleep		240
#define SYS_issetugid		253

#define CLOCK_MONOTONIC		4

#define SYS_exit		1
#define SYS_read		3
#define SYS_write		4
#define SYS_open		5
#define SYS_close		6
#define SYS_getpid		20
#define SYS_kill		37
#define SYS_sigaltstack		53
#define SYS_munmap		73
#define SYS_madvise		75
#define SYS_setitimer		83
#define SYS_fcntl		92
#define SYS___sysctl		202
#define SYS_nanosleep		240
#define SYS_issetugid		253
#define SYS_clock_gettime	232

#define CLOCK_MONOTONIC		4

#define SYS_exit		1
#define SYS_read		3
#define SYS_write		4
#define SYS_open		5
#define SYS_close		6
#define SYS_getpid		20
#define SYS_kill		37
#define SYS_sigaltstack		53
#define SYS_munmap		73
#define SYS_madvise		75
#define SYS_setitimer		83
#define SYS_fcntl		92
#define SYS___sysctl		202
#define SYS_nanosleep		240
#define SYS_issetugid		253
#define SYS_clock_gettime	232

#define CLOCK_MONOTONIC		3

#define SYS_exit			1
#define SYS_read			3
#define SYS_write			4
#define SYS_open			5
#define SYS_close			6
#define SYS_getpid			20
#define SYS_kill			37
#define SYS_munmap			73
#define SYS_madvise			75
#define SYS_fcntl			92
#define SYS_mmap			197
#define SYS___sysctl			202
#define SYS___sigaltstack14		281
#define SYS___sigprocmask14		293
#define SYS_issetugid			305

#define CLOCK_MONOTONIC		3

#define SYS_exit			1
#define SYS_read			3
#define SYS_write			4
#define SYS_open			5
#define SYS_close			6
#define SYS_getpid			20
#define SYS_kill			37
#define SYS_munmap			73
#define SYS_madvise			75
#define SYS_fcntl			92
#define SYS_mmap			197
#define SYS___sysctl			202
#define SYS___sigaltstack14		281
#define SYS___sigprocmask14		293
#define SYS_issetugid			305

#define SYS_read		4003
#define SYS_write		4004
#define SYS_open		4005
#define SYS_close		4006
#define SYS_getpid		4020
#define SYS_kill		4037
#define SYS_brk			4045
#define SYS_mmap		4090
#define SYS_munmap		4091
#define SYS_setitimer		4104
#define SYS_clone		4120
#define SYS_sched_yield		4162
#define SYS_nanosleep		4166
#define SYS_rt_sigreturn	4193
#define SYS_rt_sigaction	4194
#define SYS_rt_sigprocmask	4195