mirror of https://go.googlesource.com/go
304 lines
8.7 KiB
Go
304 lines
8.7 KiB
Go
// Copyright 2020 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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//go:build openbsd && !mips64
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package runtime
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import (
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"internal/abi"
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"internal/runtime/atomic"
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"unsafe"
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)
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// This is exported via linkname to assembly in runtime/cgo.
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//
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//go:linkname exit
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//go:nosplit
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//go:cgo_unsafe_args
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func exit(code int32) {
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libcCall(unsafe.Pointer(abi.FuncPCABI0(exit_trampoline)), unsafe.Pointer(&code))
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}
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func exit_trampoline()
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//go:nosplit
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//go:cgo_unsafe_args
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func getthrid() (tid int32) {
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libcCall(unsafe.Pointer(abi.FuncPCABI0(getthrid_trampoline)), unsafe.Pointer(&tid))
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return
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}
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func getthrid_trampoline()
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//go:nosplit
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//go:cgo_unsafe_args
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func raiseproc(sig uint32) {
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libcCall(unsafe.Pointer(abi.FuncPCABI0(raiseproc_trampoline)), unsafe.Pointer(&sig))
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}
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func raiseproc_trampoline()
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//go:nosplit
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//go:cgo_unsafe_args
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func thrkill(tid int32, sig int) {
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libcCall(unsafe.Pointer(abi.FuncPCABI0(thrkill_trampoline)), unsafe.Pointer(&tid))
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}
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func thrkill_trampoline()
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// mmap is used to do low-level memory allocation via mmap. Don't allow stack
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// splits, since this function (used by sysAlloc) is called in a lot of low-level
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// parts of the runtime and callers often assume it won't acquire any locks.
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//
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//go:nosplit
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func mmap(addr unsafe.Pointer, n uintptr, prot, flags, fd int32, off uint32) (unsafe.Pointer, int) {
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args := struct {
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addr unsafe.Pointer
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n uintptr
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prot, flags, fd int32
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off uint32
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ret1 unsafe.Pointer
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ret2 int
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}{addr, n, prot, flags, fd, off, nil, 0}
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libcCall(unsafe.Pointer(abi.FuncPCABI0(mmap_trampoline)), unsafe.Pointer(&args))
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KeepAlive(addr) // Just for consistency. Hopefully addr is not a Go address.
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return args.ret1, args.ret2
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}
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func mmap_trampoline()
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//go:nosplit
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//go:cgo_unsafe_args
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func munmap(addr unsafe.Pointer, n uintptr) {
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libcCall(unsafe.Pointer(abi.FuncPCABI0(munmap_trampoline)), unsafe.Pointer(&addr))
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KeepAlive(addr) // Just for consistency. Hopefully addr is not a Go address.
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}
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func munmap_trampoline()
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//go:nosplit
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//go:cgo_unsafe_args
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func madvise(addr unsafe.Pointer, n uintptr, flags int32) {
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libcCall(unsafe.Pointer(abi.FuncPCABI0(madvise_trampoline)), unsafe.Pointer(&addr))
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KeepAlive(addr) // Just for consistency. Hopefully addr is not a Go address.
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}
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func madvise_trampoline()
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//go:nosplit
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//go:cgo_unsafe_args
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func open(name *byte, mode, perm int32) (ret int32) {
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ret = libcCall(unsafe.Pointer(abi.FuncPCABI0(open_trampoline)), unsafe.Pointer(&name))
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KeepAlive(name)
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return
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}
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func open_trampoline()
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//go:nosplit
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//go:cgo_unsafe_args
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func closefd(fd int32) int32 {
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return libcCall(unsafe.Pointer(abi.FuncPCABI0(close_trampoline)), unsafe.Pointer(&fd))
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}
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func close_trampoline()
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//go:nosplit
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//go:cgo_unsafe_args
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func read(fd int32, p unsafe.Pointer, n int32) int32 {
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ret := libcCall(unsafe.Pointer(abi.FuncPCABI0(read_trampoline)), unsafe.Pointer(&fd))
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KeepAlive(p)
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return ret
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}
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func read_trampoline()
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//go:nosplit
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//go:cgo_unsafe_args
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func write1(fd uintptr, p unsafe.Pointer, n int32) int32 {
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ret := libcCall(unsafe.Pointer(abi.FuncPCABI0(write_trampoline)), unsafe.Pointer(&fd))
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KeepAlive(p)
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return ret
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}
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func write_trampoline()
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func pipe2(flags int32) (r, w int32, errno int32) {
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var p [2]int32
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args := struct {
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p unsafe.Pointer
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flags int32
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}{noescape(unsafe.Pointer(&p)), flags}
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errno = libcCall(unsafe.Pointer(abi.FuncPCABI0(pipe2_trampoline)), unsafe.Pointer(&args))
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return p[0], p[1], errno
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}
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func pipe2_trampoline()
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//go:nosplit
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//go:cgo_unsafe_args
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func setitimer(mode int32, new, old *itimerval) {
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libcCall(unsafe.Pointer(abi.FuncPCABI0(setitimer_trampoline)), unsafe.Pointer(&mode))
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KeepAlive(new)
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KeepAlive(old)
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}
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func setitimer_trampoline()
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//go:nosplit
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//go:cgo_unsafe_args
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func usleep(usec uint32) {
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libcCall(unsafe.Pointer(abi.FuncPCABI0(usleep_trampoline)), unsafe.Pointer(&usec))
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}
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func usleep_trampoline()
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//go:nosplit
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//go:cgo_unsafe_args
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func usleep_no_g(usec uint32) {
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asmcgocall_no_g(unsafe.Pointer(abi.FuncPCABI0(usleep_trampoline)), unsafe.Pointer(&usec))
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}
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//go:nosplit
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//go:cgo_unsafe_args
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func sysctl(mib *uint32, miblen uint32, out *byte, size *uintptr, dst *byte, ndst uintptr) int32 {
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ret := libcCall(unsafe.Pointer(abi.FuncPCABI0(sysctl_trampoline)), unsafe.Pointer(&mib))
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KeepAlive(mib)
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KeepAlive(out)
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KeepAlive(size)
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KeepAlive(dst)
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return ret
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}
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func sysctl_trampoline()
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//go:nosplit
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//go:cgo_unsafe_args
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func fcntl(fd, cmd, arg int32) (ret int32, errno int32) {
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args := struct {
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fd, cmd, arg int32
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ret, errno int32
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}{fd, cmd, arg, 0, 0}
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libcCall(unsafe.Pointer(abi.FuncPCABI0(fcntl_trampoline)), unsafe.Pointer(&args))
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return args.ret, args.errno
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}
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func fcntl_trampoline()
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//go:nosplit
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func nanotime1() int64 {
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var ts timespec
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args := struct {
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clock_id int32
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tp unsafe.Pointer
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}{_CLOCK_MONOTONIC, unsafe.Pointer(&ts)}
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if errno := libcCall(unsafe.Pointer(abi.FuncPCABI0(clock_gettime_trampoline)), unsafe.Pointer(&args)); errno < 0 {
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// Avoid growing the nosplit stack.
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systemstack(func() {
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println("runtime: errno", -errno)
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throw("clock_gettime failed")
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})
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}
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return ts.tv_sec*1e9 + int64(ts.tv_nsec)
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}
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func clock_gettime_trampoline()
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//go:nosplit
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func walltime() (int64, int32) {
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var ts timespec
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args := struct {
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clock_id int32
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tp unsafe.Pointer
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}{_CLOCK_REALTIME, unsafe.Pointer(&ts)}
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if errno := libcCall(unsafe.Pointer(abi.FuncPCABI0(clock_gettime_trampoline)), unsafe.Pointer(&args)); errno < 0 {
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// Avoid growing the nosplit stack.
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systemstack(func() {
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println("runtime: errno", -errno)
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throw("clock_gettime failed")
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})
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}
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return ts.tv_sec, int32(ts.tv_nsec)
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}
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//go:nosplit
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//go:cgo_unsafe_args
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func kqueue() int32 {
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return libcCall(unsafe.Pointer(abi.FuncPCABI0(kqueue_trampoline)), nil)
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}
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func kqueue_trampoline()
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//go:nosplit
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//go:cgo_unsafe_args
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func kevent(kq int32, ch *keventt, nch int32, ev *keventt, nev int32, ts *timespec) int32 {
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ret := libcCall(unsafe.Pointer(abi.FuncPCABI0(kevent_trampoline)), unsafe.Pointer(&kq))
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KeepAlive(ch)
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KeepAlive(ev)
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KeepAlive(ts)
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return ret
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}
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func kevent_trampoline()
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//go:nosplit
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//go:cgo_unsafe_args
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func sigaction(sig uint32, new *sigactiont, old *sigactiont) {
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libcCall(unsafe.Pointer(abi.FuncPCABI0(sigaction_trampoline)), unsafe.Pointer(&sig))
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KeepAlive(new)
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KeepAlive(old)
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}
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func sigaction_trampoline()
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//go:nosplit
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//go:cgo_unsafe_args
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func sigprocmask(how uint32, new *sigset, old *sigset) {
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// sigprocmask is called from sigsave, which is called from needm.
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// As such, we have to be able to run with no g here.
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asmcgocall_no_g(unsafe.Pointer(abi.FuncPCABI0(sigprocmask_trampoline)), unsafe.Pointer(&how))
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KeepAlive(new)
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KeepAlive(old)
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}
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func sigprocmask_trampoline()
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//go:nosplit
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//go:cgo_unsafe_args
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func sigaltstack(new *stackt, old *stackt) {
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libcCall(unsafe.Pointer(abi.FuncPCABI0(sigaltstack_trampoline)), unsafe.Pointer(&new))
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KeepAlive(new)
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KeepAlive(old)
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}
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func sigaltstack_trampoline()
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// Not used on OpenBSD, but must be defined.
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func exitThread(wait *atomic.Uint32) {
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throw("exitThread")
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}
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//go:nosplit
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//go:cgo_unsafe_args
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func issetugid() (ret int32) {
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libcCall(unsafe.Pointer(abi.FuncPCABI0(issetugid_trampoline)), unsafe.Pointer(&ret))
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return
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}
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func issetugid_trampoline()
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// Tell the linker that the libc_* functions are to be found
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// in a system library, with the libc_ prefix missing.
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//go:cgo_import_dynamic libc_errno __errno "libc.so"
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//go:cgo_import_dynamic libc_exit exit "libc.so"
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//go:cgo_import_dynamic libc_getthrid getthrid "libc.so"
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//go:cgo_import_dynamic libc_sched_yield sched_yield "libc.so"
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//go:cgo_import_dynamic libc_thrkill thrkill "libc.so"
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//go:cgo_import_dynamic libc_mmap mmap "libc.so"
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//go:cgo_import_dynamic libc_munmap munmap "libc.so"
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//go:cgo_import_dynamic libc_madvise madvise "libc.so"
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//go:cgo_import_dynamic libc_open open "libc.so"
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//go:cgo_import_dynamic libc_close close "libc.so"
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//go:cgo_import_dynamic libc_read read "libc.so"
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//go:cgo_import_dynamic libc_write write "libc.so"
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//go:cgo_import_dynamic libc_pipe2 pipe2 "libc.so"
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//go:cgo_import_dynamic libc_clock_gettime clock_gettime "libc.so"
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//go:cgo_import_dynamic libc_setitimer setitimer "libc.so"
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//go:cgo_import_dynamic libc_usleep usleep "libc.so"
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//go:cgo_import_dynamic libc_sysctl sysctl "libc.so"
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//go:cgo_import_dynamic libc_fcntl fcntl "libc.so"
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//go:cgo_import_dynamic libc_getpid getpid "libc.so"
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//go:cgo_import_dynamic libc_kill kill "libc.so"
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//go:cgo_import_dynamic libc_kqueue kqueue "libc.so"
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//go:cgo_import_dynamic libc_kevent kevent "libc.so"
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//go:cgo_import_dynamic libc_sigaction sigaction "libc.so"
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//go:cgo_import_dynamic libc_sigaltstack sigaltstack "libc.so"
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//go:cgo_import_dynamic libc_issetugid issetugid "libc.so"
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//go:cgo_import_dynamic _ _ "libc.so"
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