mirror of git://gcc.gnu.org/git/gcc.git
375 lines
13 KiB
Go
375 lines
13 KiB
Go
// Copyright 2018 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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package runtime
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import "unsafe"
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// Call fn with arg as its argument. Return what fn returns.
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// fn is the raw pc value of the entry point of the desired function.
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// Switches to the system stack, if not already there.
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// Preserves the calling point as the location where a profiler traceback will begin.
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//go:nosplit
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func libcCall(fn, arg unsafe.Pointer) int32 {
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// Leave caller's PC/SP/G around for traceback.
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gp := getg()
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var mp *m
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if gp != nil {
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mp = gp.m
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}
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if mp != nil && mp.libcallsp == 0 {
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mp.libcallg.set(gp)
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mp.libcallpc = getcallerpc()
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// sp must be the last, because once async cpu profiler finds
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// all three values to be non-zero, it will use them
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mp.libcallsp = getcallersp()
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} else {
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// Make sure we don't reset libcallsp. This makes
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// libcCall reentrant; We remember the g/pc/sp for the
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// first call on an M, until that libcCall instance
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// returns. Reentrance only matters for signals, as
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// libc never calls back into Go. The tricky case is
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// where we call libcX from an M and record g/pc/sp.
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// Before that call returns, a signal arrives on the
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// same M and the signal handling code calls another
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// libc function. We don't want that second libcCall
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// from within the handler to be recorded, and we
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// don't want that call's completion to zero
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// libcallsp.
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// We don't need to set libcall* while we're in a sighandler
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// (even if we're not currently in libc) because we block all
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// signals while we're handling a signal. That includes the
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// profile signal, which is the one that uses the libcall* info.
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mp = nil
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}
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res := asmcgocall(fn, arg)
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if mp != nil {
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mp.libcallsp = 0
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}
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return res
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}
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// The *_trampoline functions convert from the Go calling convention to the C calling convention
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// and then call the underlying libc function. They are defined in sys_darwin_$ARCH.s.
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//go:nosplit
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//go:cgo_unsafe_args
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func pthread_attr_init(attr *pthreadattr) int32 {
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return libcCall(unsafe.Pointer(funcPC(pthread_attr_init_trampoline)), unsafe.Pointer(&attr))
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}
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func pthread_attr_init_trampoline()
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//go:nosplit
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//go:cgo_unsafe_args
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func pthread_attr_setstacksize(attr *pthreadattr, size uintptr) int32 {
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return libcCall(unsafe.Pointer(funcPC(pthread_attr_setstacksize_trampoline)), unsafe.Pointer(&attr))
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}
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func pthread_attr_setstacksize_trampoline()
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//go:nosplit
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//go:cgo_unsafe_args
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func pthread_attr_setdetachstate(attr *pthreadattr, state int) int32 {
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return libcCall(unsafe.Pointer(funcPC(pthread_attr_setdetachstate_trampoline)), unsafe.Pointer(&attr))
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}
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func pthread_attr_setdetachstate_trampoline()
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//go:nosplit
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//go:cgo_unsafe_args
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func pthread_create(attr *pthreadattr, start uintptr, arg unsafe.Pointer) int32 {
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return libcCall(unsafe.Pointer(funcPC(pthread_create_trampoline)), unsafe.Pointer(&attr))
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}
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func pthread_create_trampoline()
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//go:nosplit
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//go:cgo_unsafe_args
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func raise(sig uint32) {
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libcCall(unsafe.Pointer(funcPC(raise_trampoline)), unsafe.Pointer(&sig))
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}
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func raise_trampoline()
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//go:nosplit
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//go:cgo_unsafe_args
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func pthread_self() (t pthread) {
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libcCall(unsafe.Pointer(funcPC(pthread_self_trampoline)), unsafe.Pointer(&t))
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return
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}
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func pthread_self_trampoline()
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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(funcPC(mmap_trampoline)), unsafe.Pointer(&args))
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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(funcPC(munmap_trampoline)), unsafe.Pointer(&addr))
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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(funcPC(madvise_trampoline)), unsafe.Pointer(&addr))
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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 read(fd int32, p unsafe.Pointer, n int32) int32 {
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return libcCall(unsafe.Pointer(funcPC(read_trampoline)), unsafe.Pointer(&fd))
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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 closefd(fd int32) int32 {
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return libcCall(unsafe.Pointer(funcPC(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 exit(code int32) {
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libcCall(unsafe.Pointer(funcPC(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 usleep(usec uint32) {
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libcCall(unsafe.Pointer(funcPC(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 write(fd uintptr, p unsafe.Pointer, n int32) int32 {
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return libcCall(unsafe.Pointer(funcPC(write_trampoline)), unsafe.Pointer(&fd))
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}
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func write_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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return libcCall(unsafe.Pointer(funcPC(open_trampoline)), unsafe.Pointer(&name))
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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 nanotime() int64 {
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var r struct {
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t int64 // raw timer
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numer, denom uint32 // conversion factors. nanoseconds = t * numer / denom.
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}
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libcCall(unsafe.Pointer(funcPC(nanotime_trampoline)), unsafe.Pointer(&r))
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// Note: Apple seems unconcerned about overflow here. See
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// https://developer.apple.com/library/content/qa/qa1398/_index.html
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// Note also, numer == denom == 1 is common.
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t := r.t
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if r.numer != 1 {
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t *= int64(r.numer)
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}
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if r.denom != 1 {
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t /= int64(r.denom)
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}
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return t
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}
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func nanotime_trampoline()
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//go:nosplit
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//go:cgo_unsafe_args
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func walltime() (int64, int32) {
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var t timeval
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libcCall(unsafe.Pointer(funcPC(walltime_trampoline)), unsafe.Pointer(&t))
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return int64(t.tv_sec), 1000 * t.tv_usec
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}
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func walltime_trampoline()
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//go:nosplit
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//go:cgo_unsafe_args
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func sigaction(sig uint32, new *usigactiont, old *usigactiont) {
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libcCall(unsafe.Pointer(funcPC(sigaction_trampoline)), unsafe.Pointer(&sig))
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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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libcCall(unsafe.Pointer(funcPC(sigprocmask_trampoline)), unsafe.Pointer(&how))
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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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if new != nil && new.ss_flags&_SS_DISABLE != 0 && new.ss_size == 0 {
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// Despite the fact that Darwin's sigaltstack man page says it ignores the size
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// when SS_DISABLE is set, it doesn't. sigaltstack returns ENOMEM
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// if we don't give it a reasonable size.
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// ref: http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20140421/214296.html
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new.ss_size = 32768
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}
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libcCall(unsafe.Pointer(funcPC(sigaltstack_trampoline)), unsafe.Pointer(&new))
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}
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func sigaltstack_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(funcPC(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 setitimer(mode int32, new, old *itimerval) {
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libcCall(unsafe.Pointer(funcPC(setitimer_trampoline)), unsafe.Pointer(&mode))
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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 sysctl(mib *uint32, miblen uint32, out *byte, size *uintptr, dst *byte, ndst uintptr) int32 {
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return libcCall(unsafe.Pointer(funcPC(sysctl_trampoline)), unsafe.Pointer(&mib))
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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) int32 {
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return libcCall(unsafe.Pointer(funcPC(fcntl_trampoline)), unsafe.Pointer(&fd))
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}
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func fcntl_trampoline()
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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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v := libcCall(unsafe.Pointer(funcPC(kqueue_trampoline)), nil)
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return v
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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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return libcCall(unsafe.Pointer(funcPC(kevent_trampoline)), unsafe.Pointer(&kq))
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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 pthread_mutex_init(m *pthreadmutex, attr *pthreadmutexattr) int32 {
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return libcCall(unsafe.Pointer(funcPC(pthread_mutex_init_trampoline)), unsafe.Pointer(&m))
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}
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func pthread_mutex_init_trampoline()
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//go:nosplit
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//go:cgo_unsafe_args
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func pthread_mutex_lock(m *pthreadmutex) int32 {
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return libcCall(unsafe.Pointer(funcPC(pthread_mutex_lock_trampoline)), unsafe.Pointer(&m))
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}
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func pthread_mutex_lock_trampoline()
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//go:nosplit
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//go:cgo_unsafe_args
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func pthread_mutex_unlock(m *pthreadmutex) int32 {
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return libcCall(unsafe.Pointer(funcPC(pthread_mutex_unlock_trampoline)), unsafe.Pointer(&m))
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}
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func pthread_mutex_unlock_trampoline()
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//go:nosplit
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//go:cgo_unsafe_args
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func pthread_cond_init(c *pthreadcond, attr *pthreadcondattr) int32 {
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return libcCall(unsafe.Pointer(funcPC(pthread_cond_init_trampoline)), unsafe.Pointer(&c))
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}
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func pthread_cond_init_trampoline()
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//go:nosplit
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//go:cgo_unsafe_args
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func pthread_cond_wait(c *pthreadcond, m *pthreadmutex) int32 {
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return libcCall(unsafe.Pointer(funcPC(pthread_cond_wait_trampoline)), unsafe.Pointer(&c))
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}
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func pthread_cond_wait_trampoline()
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//go:nosplit
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//go:cgo_unsafe_args
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func pthread_cond_timedwait_relative_np(c *pthreadcond, m *pthreadmutex, t *timespec) int32 {
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return libcCall(unsafe.Pointer(funcPC(pthread_cond_timedwait_relative_np_trampoline)), unsafe.Pointer(&c))
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}
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func pthread_cond_timedwait_relative_np_trampoline()
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//go:nosplit
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//go:cgo_unsafe_args
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func pthread_cond_signal(c *pthreadcond) int32 {
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return libcCall(unsafe.Pointer(funcPC(pthread_cond_signal_trampoline)), unsafe.Pointer(&c))
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}
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func pthread_cond_signal_trampoline()
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// Not used on Darwin, but must be defined.
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func exitThread(wait *uint32) {
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}
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//go:nosplit
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func closeonexec(fd int32) {
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fcntl(fd, _F_SETFD, _FD_CLOEXEC)
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}
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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_pthread_attr_init pthread_attr_init "/usr/lib/libSystem.B.dylib"
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//go:cgo_import_dynamic libc_pthread_attr_setstacksize pthread_attr_setstacksize "/usr/lib/libSystem.B.dylib"
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//go:cgo_import_dynamic libc_pthread_attr_setdetachstate pthread_attr_setdetachstate "/usr/lib/libSystem.B.dylib"
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//go:cgo_import_dynamic libc_pthread_create pthread_create "/usr/lib/libSystem.B.dylib"
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//go:cgo_import_dynamic libc_exit exit "/usr/lib/libSystem.B.dylib"
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//go:cgo_import_dynamic libc_raise raise "/usr/lib/libSystem.B.dylib"
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//go:cgo_import_dynamic libc_open open "/usr/lib/libSystem.B.dylib"
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//go:cgo_import_dynamic libc_close close "/usr/lib/libSystem.B.dylib"
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//go:cgo_import_dynamic libc_read read "/usr/lib/libSystem.B.dylib"
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//go:cgo_import_dynamic libc_write write "/usr/lib/libSystem.B.dylib"
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//go:cgo_import_dynamic libc_mmap mmap "/usr/lib/libSystem.B.dylib"
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//go:cgo_import_dynamic libc_munmap munmap "/usr/lib/libSystem.B.dylib"
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//go:cgo_import_dynamic libc_madvise madvise "/usr/lib/libSystem.B.dylib"
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//go:cgo_import_dynamic libc_error __error "/usr/lib/libSystem.B.dylib"
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//go:cgo_import_dynamic libc_usleep usleep "/usr/lib/libSystem.B.dylib"
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//go:cgo_import_dynamic libc_mach_timebase_info mach_timebase_info "/usr/lib/libSystem.B.dylib"
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//go:cgo_import_dynamic libc_mach_absolute_time mach_absolute_time "/usr/lib/libSystem.B.dylib"
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//go:cgo_import_dynamic libc_gettimeofday gettimeofday "/usr/lib/libSystem.B.dylib"
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//go:cgo_import_dynamic libc_sigaction sigaction "/usr/lib/libSystem.B.dylib"
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//go:cgo_import_dynamic libc_pthread_sigmask pthread_sigmask "/usr/lib/libSystem.B.dylib"
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//go:cgo_import_dynamic libc_sigaltstack sigaltstack "/usr/lib/libSystem.B.dylib"
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//go:cgo_import_dynamic libc_getpid getpid "/usr/lib/libSystem.B.dylib"
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//go:cgo_import_dynamic libc_kill kill "/usr/lib/libSystem.B.dylib"
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//go:cgo_import_dynamic libc_setitimer setitimer "/usr/lib/libSystem.B.dylib"
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//go:cgo_import_dynamic libc_sysctl sysctl "/usr/lib/libSystem.B.dylib"
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//go:cgo_import_dynamic libc_fcntl fcntl "/usr/lib/libSystem.B.dylib"
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//go:cgo_import_dynamic libc_kqueue kqueue "/usr/lib/libSystem.B.dylib"
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//go:cgo_import_dynamic libc_kevent kevent "/usr/lib/libSystem.B.dylib"
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//go:cgo_import_dynamic libc_pthread_mutex_init pthread_mutex_init "/usr/lib/libSystem.B.dylib"
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//go:cgo_import_dynamic libc_pthread_mutex_lock pthread_mutex_lock "/usr/lib/libSystem.B.dylib"
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//go:cgo_import_dynamic libc_pthread_mutex_unlock pthread_mutex_unlock "/usr/lib/libSystem.B.dylib"
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//go:cgo_import_dynamic libc_pthread_cond_init pthread_cond_init "/usr/lib/libSystem.B.dylib"
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//go:cgo_import_dynamic libc_pthread_cond_wait pthread_cond_wait "/usr/lib/libSystem.B.dylib"
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//go:cgo_import_dynamic libc_pthread_cond_timedwait_relative_np pthread_cond_timedwait_relative_np "/usr/lib/libSystem.B.dylib"
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//go:cgo_import_dynamic libc_pthread_cond_signal pthread_cond_signal "/usr/lib/libSystem.B.dylib"
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// Magic incantation to get libSystem actually dynamically linked.
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// TODO: Why does the code require this? See cmd/compile/internal/ld/go.go:210
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//go:cgo_import_dynamic _ _ "/usr/lib/libSystem.B.dylib"
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