github.com/c12o16h1/go/src@v0.0.0-20200114212001-5a151c0f00ed/syscall/syscall_linux_arm.go (about)

     1  // Copyright 2009 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package syscall
     6  
     7  import "unsafe"
     8  
     9  const (
    10  	_SYS_dup       = SYS_DUP2
    11  	_SYS_setgroups = SYS_SETGROUPS32
    12  )
    13  
    14  func setTimespec(sec, nsec int64) Timespec {
    15  	return Timespec{Sec: int32(sec), Nsec: int32(nsec)}
    16  }
    17  
    18  func setTimeval(sec, usec int64) Timeval {
    19  	return Timeval{Sec: int32(sec), Usec: int32(usec)}
    20  }
    21  
    22  //sysnb pipe(p *[2]_C_int) (err error)
    23  
    24  func Pipe(p []int) (err error) {
    25  	if len(p) != 2 {
    26  		return EINVAL
    27  	}
    28  	var pp [2]_C_int
    29  	// Try pipe2 first for Android O, then try pipe for kernel 2.6.23.
    30  	err = pipe2(&pp, 0)
    31  	if err == ENOSYS {
    32  		err = pipe(&pp)
    33  	}
    34  	p[0] = int(pp[0])
    35  	p[1] = int(pp[1])
    36  	return
    37  }
    38  
    39  //sysnb pipe2(p *[2]_C_int, flags int) (err error)
    40  
    41  func Pipe2(p []int, flags int) (err error) {
    42  	if len(p) != 2 {
    43  		return EINVAL
    44  	}
    45  	var pp [2]_C_int
    46  	err = pipe2(&pp, flags)
    47  	p[0] = int(pp[0])
    48  	p[1] = int(pp[1])
    49  	return
    50  }
    51  
    52  // Underlying system call writes to newoffset via pointer.
    53  // Implemented in assembly to avoid allocation.
    54  func seek(fd int, offset int64, whence int) (newoffset int64, err Errno)
    55  
    56  func Seek(fd int, offset int64, whence int) (newoffset int64, err error) {
    57  	newoffset, errno := seek(fd, offset, whence)
    58  	if errno != 0 {
    59  		return 0, errno
    60  	}
    61  	return newoffset, nil
    62  }
    63  
    64  //sys	accept(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (fd int, err error)
    65  //sys	accept4(s int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (fd int, err error)
    66  //sys	bind(s int, addr unsafe.Pointer, addrlen _Socklen) (err error)
    67  //sys	connect(s int, addr unsafe.Pointer, addrlen _Socklen) (err error)
    68  //sysnb	getgroups(n int, list *_Gid_t) (nn int, err error) = SYS_GETGROUPS32
    69  //sysnb	setgroups(n int, list *_Gid_t) (err error) = SYS_SETGROUPS32
    70  //sys	getsockopt(s int, level int, name int, val unsafe.Pointer, vallen *_Socklen) (err error)
    71  //sys	setsockopt(s int, level int, name int, val unsafe.Pointer, vallen uintptr) (err error)
    72  //sysnb	socket(domain int, typ int, proto int) (fd int, err error)
    73  //sysnb	getpeername(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error)
    74  //sysnb	getsockname(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error)
    75  //sys	recvfrom(fd int, p []byte, flags int, from *RawSockaddrAny, fromlen *_Socklen) (n int, err error)
    76  //sys	sendto(s int, buf []byte, flags int, to unsafe.Pointer, addrlen _Socklen) (err error)
    77  //sysnb	socketpair(domain int, typ int, flags int, fd *[2]int32) (err error)
    78  //sys	recvmsg(s int, msg *Msghdr, flags int) (n int, err error)
    79  //sys	sendmsg(s int, msg *Msghdr, flags int) (n int, err error)
    80  
    81  // 64-bit file system and 32-bit uid calls
    82  // (16-bit uid calls are not always supported in newer kernels)
    83  //sys	Dup2(oldfd int, newfd int) (err error)
    84  //sysnb	EpollCreate(size int) (fd int, err error)
    85  //sys	Fchown(fd int, uid int, gid int) (err error) = SYS_FCHOWN32
    86  //sys	Fstat(fd int, stat *Stat_t) (err error) = SYS_FSTAT64
    87  //sys	fstatat(dirfd int, path string, stat *Stat_t, flags int) (err error) = SYS_FSTATAT64
    88  //sysnb	Getegid() (egid int) = SYS_GETEGID32
    89  //sysnb	Geteuid() (euid int) = SYS_GETEUID32
    90  //sysnb	Getgid() (gid int) = SYS_GETGID32
    91  //sysnb	Getuid() (uid int) = SYS_GETUID32
    92  //sysnb	InotifyInit() (fd int, err error)
    93  //sys	Listen(s int, n int) (err error)
    94  //sys	Pause() (err error)
    95  //sys	Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error)
    96  //sys	sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) = SYS_SENDFILE64
    97  //sys	Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err error) = SYS__NEWSELECT
    98  //sys	Setfsgid(gid int) (err error) = SYS_SETFSGID32
    99  //sys	Setfsuid(uid int) (err error) = SYS_SETFSUID32
   100  //sysnb	Setregid(rgid int, egid int) (err error) = SYS_SETREGID32
   101  //sysnb	Setresgid(rgid int, egid int, sgid int) (err error) = SYS_SETRESGID32
   102  //sysnb	Setresuid(ruid int, euid int, suid int) (err error) = SYS_SETRESUID32
   103  //sysnb	Setreuid(ruid int, euid int) (err error) = SYS_SETREUID32
   104  //sys	Shutdown(fd int, how int) (err error)
   105  //sys	Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int, err error)
   106  //sys	Ustat(dev int, ubuf *Ustat_t) (err error)
   107  
   108  //sys	futimesat(dirfd int, path string, times *[2]Timeval) (err error)
   109  //sysnb	Gettimeofday(tv *Timeval) (err error)
   110  //sysnb	Time(t *Time_t) (tt Time_t, err error)
   111  //sys	Utime(path string, buf *Utimbuf) (err error)
   112  //sys	utimes(path string, times *[2]Timeval) (err error)
   113  
   114  //sys   Pread(fd int, p []byte, offset int64) (n int, err error) = SYS_PREAD64
   115  //sys   Pwrite(fd int, p []byte, offset int64) (n int, err error) = SYS_PWRITE64
   116  //sys	Truncate(path string, length int64) (err error) = SYS_TRUNCATE64
   117  //sys	Ftruncate(fd int, length int64) (err error) = SYS_FTRUNCATE64
   118  
   119  //sys	mmap2(addr uintptr, length uintptr, prot int, flags int, fd int, pageOffset uintptr) (xaddr uintptr, err error)
   120  //sys	EpollWait(epfd int, events []EpollEvent, msec int) (n int, err error)
   121  
   122  func Stat(path string, stat *Stat_t) (err error) {
   123  	return fstatat(_AT_FDCWD, path, stat, 0)
   124  }
   125  
   126  func Lchown(path string, uid int, gid int) (err error) {
   127  	return Fchownat(_AT_FDCWD, path, uid, gid, _AT_SYMLINK_NOFOLLOW)
   128  }
   129  
   130  func Lstat(path string, stat *Stat_t) (err error) {
   131  	return fstatat(_AT_FDCWD, path, stat, _AT_SYMLINK_NOFOLLOW)
   132  }
   133  
   134  func Fstatfs(fd int, buf *Statfs_t) (err error) {
   135  	_, _, e := Syscall(SYS_FSTATFS64, uintptr(fd), unsafe.Sizeof(*buf), uintptr(unsafe.Pointer(buf)))
   136  	if e != 0 {
   137  		err = e
   138  	}
   139  	return
   140  }
   141  
   142  func Statfs(path string, buf *Statfs_t) (err error) {
   143  	pathp, err := BytePtrFromString(path)
   144  	if err != nil {
   145  		return err
   146  	}
   147  	_, _, e := Syscall(SYS_STATFS64, uintptr(unsafe.Pointer(pathp)), unsafe.Sizeof(*buf), uintptr(unsafe.Pointer(buf)))
   148  	if e != 0 {
   149  		err = e
   150  	}
   151  	return
   152  }
   153  
   154  func mmap(addr uintptr, length uintptr, prot int, flags int, fd int, offset int64) (xaddr uintptr, err error) {
   155  	page := uintptr(offset / 4096)
   156  	if offset != int64(page)*4096 {
   157  		return 0, EINVAL
   158  	}
   159  	return mmap2(addr, length, prot, flags, fd, page)
   160  }
   161  
   162  type rlimit32 struct {
   163  	Cur uint32
   164  	Max uint32
   165  }
   166  
   167  //sysnb getrlimit(resource int, rlim *rlimit32) (err error) = SYS_GETRLIMIT
   168  
   169  const rlimInf32 = ^uint32(0)
   170  const rlimInf64 = ^uint64(0)
   171  
   172  func Getrlimit(resource int, rlim *Rlimit) (err error) {
   173  	err = prlimit(0, resource, nil, rlim)
   174  	if err != ENOSYS {
   175  		return err
   176  	}
   177  
   178  	rl := rlimit32{}
   179  	err = getrlimit(resource, &rl)
   180  	if err != nil {
   181  		return
   182  	}
   183  
   184  	if rl.Cur == rlimInf32 {
   185  		rlim.Cur = rlimInf64
   186  	} else {
   187  		rlim.Cur = uint64(rl.Cur)
   188  	}
   189  
   190  	if rl.Max == rlimInf32 {
   191  		rlim.Max = rlimInf64
   192  	} else {
   193  		rlim.Max = uint64(rl.Max)
   194  	}
   195  	return
   196  }
   197  
   198  //sysnb setrlimit(resource int, rlim *rlimit32) (err error) = SYS_SETRLIMIT
   199  
   200  func Setrlimit(resource int, rlim *Rlimit) (err error) {
   201  	err = prlimit(0, resource, rlim, nil)
   202  	if err != ENOSYS {
   203  		return err
   204  	}
   205  
   206  	rl := rlimit32{}
   207  	if rlim.Cur == rlimInf64 {
   208  		rl.Cur = rlimInf32
   209  	} else if rlim.Cur < uint64(rlimInf32) {
   210  		rl.Cur = uint32(rlim.Cur)
   211  	} else {
   212  		return EINVAL
   213  	}
   214  	if rlim.Max == rlimInf64 {
   215  		rl.Max = rlimInf32
   216  	} else if rlim.Max < uint64(rlimInf32) {
   217  		rl.Max = uint32(rlim.Max)
   218  	} else {
   219  		return EINVAL
   220  	}
   221  
   222  	return setrlimit(resource, &rl)
   223  }
   224  
   225  func (r *PtraceRegs) PC() uint64 { return uint64(r.Uregs[15]) }
   226  
   227  func (r *PtraceRegs) SetPC(pc uint64) { r.Uregs[15] = uint32(pc) }
   228  
   229  func (iov *Iovec) SetLen(length int) {
   230  	iov.Len = uint32(length)
   231  }
   232  
   233  func (msghdr *Msghdr) SetControllen(length int) {
   234  	msghdr.Controllen = uint32(length)
   235  }
   236  
   237  func (cmsg *Cmsghdr) SetLen(length int) {
   238  	cmsg.Len = uint32(length)
   239  }
   240  
   241  func rawVforkSyscall(trap, a1 uintptr) (r1 uintptr, err Errno) {
   242  	panic("not implemented")
   243  }