github.com/code-reading/golang@v0.0.0-20220303082512-ba5bc0e589a3/go/src/syscall/syscall_linux_s390x.go (about) 1 // Copyright 2016 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 // archHonorsR2 captures the fact that r2 is honored by the 10 // runtime.GOARCH. Syscall conventions are generally r1, r2, err := 11 // syscall(trap, ...). Not all architectures define r2 in their 12 // ABI. See "man syscall". 13 const archHonorsR2 = true 14 15 const _SYS_setgroups = SYS_SETGROUPS 16 17 //sys Dup2(oldfd int, newfd int) (err error) 18 //sysnb EpollCreate(size int) (fd int, err error) 19 //sys EpollWait(epfd int, events []EpollEvent, msec int) (n int, err error) 20 //sys Fchown(fd int, uid int, gid int) (err error) 21 //sys Fstat(fd int, stat *Stat_t) (err error) 22 //sys fstatat(dirfd int, path string, stat *Stat_t, flags int) (err error) = SYS_NEWFSTATAT 23 //sys Fstatfs(fd int, buf *Statfs_t) (err error) 24 //sys Ftruncate(fd int, length int64) (err error) 25 //sysnb Getegid() (egid int) 26 //sysnb Geteuid() (euid int) 27 //sysnb Getgid() (gid int) 28 //sysnb Getrlimit(resource int, rlim *Rlimit) (err error) = SYS_GETRLIMIT 29 //sysnb Getuid() (uid int) 30 //sysnb InotifyInit() (fd int, err error) 31 //sys Lchown(path string, uid int, gid int) (err error) 32 //sys Lstat(path string, stat *Stat_t) (err error) 33 //sys Pause() (err error) 34 //sys Pread(fd int, p []byte, offset int64) (n int, err error) = SYS_PREAD64 35 //sys Pwrite(fd int, p []byte, offset int64) (n int, err error) = SYS_PWRITE64 36 //sys Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error) 37 //sys Seek(fd int, offset int64, whence int) (off int64, err error) = SYS_LSEEK 38 //sys Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err error) 39 //sys sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) 40 //sys Setfsgid(gid int) (err error) 41 //sys Setfsuid(uid int) (err error) 42 //sysnb Setrlimit(resource int, rlim *Rlimit) (err error) 43 //sys Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int64, err error) 44 //sys Stat(path string, stat *Stat_t) (err error) 45 //sys Statfs(path string, buf *Statfs_t) (err error) 46 //sys SyncFileRange(fd int, off int64, n int64, flags int) (err error) = SYS_SYNC_FILE_RANGE 47 //sys Truncate(path string, length int64) (err error) 48 //sys Ustat(dev int, ubuf *Ustat_t) (err error) 49 //sysnb getgroups(n int, list *_Gid_t) (nn int, err error) 50 51 //sys futimesat(dirfd int, path string, times *[2]Timeval) (err error) 52 //sysnb Gettimeofday(tv *Timeval) (err error) 53 54 func Time(t *Time_t) (tt Time_t, err error) { 55 var tv Timeval 56 err = Gettimeofday(&tv) 57 if err != nil { 58 return 0, err 59 } 60 if t != nil { 61 *t = Time_t(tv.Sec) 62 } 63 return Time_t(tv.Sec), nil 64 } 65 66 //sys Utime(path string, buf *Utimbuf) (err error) 67 //sys utimes(path string, times *[2]Timeval) (err error) 68 69 func setTimespec(sec, nsec int64) Timespec { 70 return Timespec{Sec: sec, Nsec: nsec} 71 } 72 73 func setTimeval(sec, usec int64) Timeval { 74 return Timeval{Sec: sec, Usec: usec} 75 } 76 77 func Pipe(p []int) (err error) { 78 if len(p) != 2 { 79 return EINVAL 80 } 81 var pp [2]_C_int 82 err = pipe2(&pp, 0) 83 if err == nil { 84 p[0] = int(pp[0]) 85 p[1] = int(pp[1]) 86 } 87 return 88 } 89 90 //sysnb pipe2(p *[2]_C_int, flags int) (err error) 91 92 func Pipe2(p []int, flags int) (err error) { 93 if len(p) != 2 { 94 return EINVAL 95 } 96 var pp [2]_C_int 97 err = pipe2(&pp, flags) 98 if err == nil { 99 p[0] = int(pp[0]) 100 p[1] = int(pp[1]) 101 } 102 return 103 } 104 105 // Linux on s390x uses the old mmap interface, which requires arguments to be passed in a struct. 106 // mmap2 also requires arguments to be passed in a struct; it is currently not exposed in <asm/unistd.h>. 107 func mmap(addr uintptr, length uintptr, prot int, flags int, fd int, offset int64) (xaddr uintptr, err error) { 108 mmap_args := [6]uintptr{addr, length, uintptr(prot), uintptr(flags), uintptr(fd), uintptr(offset)} 109 r0, _, e1 := Syscall(SYS_MMAP, uintptr(unsafe.Pointer(&mmap_args[0])), 0, 0) 110 xaddr = uintptr(r0) 111 if e1 != 0 { 112 err = errnoErr(e1) 113 } 114 return 115 } 116 117 // On s390x Linux, all the socket calls go through an extra indirection. 118 // The arguments to the underlying system call are the number below 119 // and a pointer to an array of uintptr. We hide the pointer in the 120 // socketcall assembly to avoid allocation on every system call. 121 122 const ( 123 // see linux/net.h 124 _SOCKET = 1 125 _BIND = 2 126 _CONNECT = 3 127 _LISTEN = 4 128 _ACCEPT = 5 129 _GETSOCKNAME = 6 130 _GETPEERNAME = 7 131 _SOCKETPAIR = 8 132 _SEND = 9 133 _RECV = 10 134 _SENDTO = 11 135 _RECVFROM = 12 136 _SHUTDOWN = 13 137 _SETSOCKOPT = 14 138 _GETSOCKOPT = 15 139 _SENDMSG = 16 140 _RECVMSG = 17 141 _ACCEPT4 = 18 142 _RECVMMSG = 19 143 _SENDMMSG = 20 144 ) 145 146 func socketcall(call int, a0, a1, a2, a3, a4, a5 uintptr) (n int, err Errno) 147 func rawsocketcall(call int, a0, a1, a2, a3, a4, a5 uintptr) (n int, err Errno) 148 149 func accept(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (fd int, err error) { 150 fd, e := socketcall(_ACCEPT, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), 0, 0, 0) 151 if e != 0 { 152 err = e 153 } 154 return 155 } 156 157 func accept4(s int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (fd int, err error) { 158 fd, e := socketcall(_ACCEPT4, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), uintptr(flags), 0, 0) 159 if e != 0 { 160 err = e 161 } 162 return 163 } 164 165 func getsockname(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error) { 166 _, e := rawsocketcall(_GETSOCKNAME, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), 0, 0, 0) 167 if e != 0 { 168 err = e 169 } 170 return 171 } 172 173 func getpeername(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error) { 174 _, e := rawsocketcall(_GETPEERNAME, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), 0, 0, 0) 175 if e != 0 { 176 err = e 177 } 178 return 179 } 180 181 func socketpair(domain int, typ int, flags int, fd *[2]int32) (err error) { 182 _, e := rawsocketcall(_SOCKETPAIR, uintptr(domain), uintptr(typ), uintptr(flags), uintptr(unsafe.Pointer(fd)), 0, 0) 183 if e != 0 { 184 err = e 185 } 186 return 187 } 188 189 func bind(s int, addr unsafe.Pointer, addrlen _Socklen) (err error) { 190 _, e := socketcall(_BIND, uintptr(s), uintptr(addr), uintptr(addrlen), 0, 0, 0) 191 if e != 0 { 192 err = e 193 } 194 return 195 } 196 197 func connect(s int, addr unsafe.Pointer, addrlen _Socklen) (err error) { 198 _, e := socketcall(_CONNECT, uintptr(s), uintptr(addr), uintptr(addrlen), 0, 0, 0) 199 if e != 0 { 200 err = e 201 } 202 return 203 } 204 205 func socket(domain int, typ int, proto int) (fd int, err error) { 206 fd, e := rawsocketcall(_SOCKET, uintptr(domain), uintptr(typ), uintptr(proto), 0, 0, 0) 207 if e != 0 { 208 err = e 209 } 210 return 211 } 212 213 func getsockopt(s int, level int, name int, val unsafe.Pointer, vallen *_Socklen) (err error) { 214 _, e := socketcall(_GETSOCKOPT, uintptr(s), uintptr(level), uintptr(name), uintptr(val), uintptr(unsafe.Pointer(vallen)), 0) 215 if e != 0 { 216 err = e 217 } 218 return 219 } 220 221 func setsockopt(s int, level int, name int, val unsafe.Pointer, vallen uintptr) (err error) { 222 _, e := socketcall(_SETSOCKOPT, uintptr(s), uintptr(level), uintptr(name), uintptr(val), vallen, 0) 223 if e != 0 { 224 err = e 225 } 226 return 227 } 228 229 func recvfrom(s int, p []byte, flags int, from *RawSockaddrAny, fromlen *_Socklen) (n int, err error) { 230 var base uintptr 231 if len(p) > 0 { 232 base = uintptr(unsafe.Pointer(&p[0])) 233 } 234 n, e := socketcall(_RECVFROM, uintptr(s), base, uintptr(len(p)), uintptr(flags), uintptr(unsafe.Pointer(from)), uintptr(unsafe.Pointer(fromlen))) 235 if e != 0 { 236 err = e 237 } 238 return 239 } 240 241 func sendto(s int, p []byte, flags int, to unsafe.Pointer, addrlen _Socklen) (err error) { 242 var base uintptr 243 if len(p) > 0 { 244 base = uintptr(unsafe.Pointer(&p[0])) 245 } 246 _, e := socketcall(_SENDTO, uintptr(s), base, uintptr(len(p)), uintptr(flags), uintptr(to), uintptr(addrlen)) 247 if e != 0 { 248 err = e 249 } 250 return 251 } 252 253 func recvmsg(s int, msg *Msghdr, flags int) (n int, err error) { 254 n, e := socketcall(_RECVMSG, uintptr(s), uintptr(unsafe.Pointer(msg)), uintptr(flags), 0, 0, 0) 255 if e != 0 { 256 err = e 257 } 258 return 259 } 260 261 func sendmsg(s int, msg *Msghdr, flags int) (n int, err error) { 262 n, e := socketcall(_SENDMSG, uintptr(s), uintptr(unsafe.Pointer(msg)), uintptr(flags), 0, 0, 0) 263 if e != 0 { 264 err = e 265 } 266 return 267 } 268 269 func Listen(s int, n int) (err error) { 270 _, e := socketcall(_LISTEN, uintptr(s), uintptr(n), 0, 0, 0, 0) 271 if e != 0 { 272 err = e 273 } 274 return 275 } 276 277 func Shutdown(s, how int) (err error) { 278 _, e := socketcall(_SHUTDOWN, uintptr(s), uintptr(how), 0, 0, 0, 0) 279 if e != 0 { 280 err = e 281 } 282 return 283 } 284 285 func (r *PtraceRegs) PC() uint64 { return r.Psw.Addr } 286 287 func (r *PtraceRegs) SetPC(pc uint64) { r.Psw.Addr = pc } 288 289 func (iov *Iovec) SetLen(length int) { 290 iov.Len = uint64(length) 291 } 292 293 func (msghdr *Msghdr) SetControllen(length int) { 294 msghdr.Controllen = uint64(length) 295 } 296 297 func (cmsg *Cmsghdr) SetLen(length int) { 298 cmsg.Len = uint64(length) 299 } 300 301 func rawVforkSyscall(trap, a1 uintptr) (r1 uintptr, err Errno)