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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build !cgo
package fakecgo
import "unsafe"
//go:nosplit
//go:norace
func _cgo_sys_thread_start(ts *ThreadStart) {
var attr pthread_attr_t
var ign, oset sigset_t
var p pthread_t
var size size_t
var err int
sigfillset(&ign)
pthread_sigmask(SIG_SETMASK, &ign, &oset)
size = pthread_get_stacksize_np(pthread_self())
pthread_attr_init(&attr)
pthread_attr_setstacksize(&attr, size)
// Leave stacklo=0 and set stackhi=size; mstart will do the rest.
ts.g.stackhi = uintptr(size)
err = _cgo_try_pthread_create(&p, &attr, unsafe.Pointer(threadentry_trampolineABI0), ts)
pthread_sigmask(SIG_SETMASK, &oset, nil)
if err != 0 {
print("fakecgo: pthread_create failed: ")
println(err)
abort()
}
}
// threadentry_trampolineABI0 maps the C ABI to Go ABI then calls the Go function
//
//go:linkname x_threadentry_trampoline threadentry_trampoline
var x_threadentry_trampoline byte
var threadentry_trampolineABI0 = &x_threadentry_trampoline
//go:nosplit
//go:norace
func threadentry(v unsafe.Pointer) unsafe.Pointer {
ts := *(*ThreadStart)(v)
free(v)
// TODO: support ios
//#if TARGET_OS_IPHONE
// darwin_arm_init_thread_exception_port();
//#endif
setg_trampoline(setg_func, uintptr(unsafe.Pointer(ts.g)))
// faking funcs in go is a bit a... involved - but the following works :)
fn := uintptr(unsafe.Pointer(&ts.fn))
(*(*func())(unsafe.Pointer(&fn)))()
return nil
}
// here we will store a pointer to the provided setg func
var setg_func uintptr
// x_cgo_init(G *g, void (*setg)(void*)) (runtime/cgo/gcc_linux_amd64.c)
// This get's called during startup, adjusts stacklo, and provides a pointer to setg_gcc for us
// Additionally, if we set _cgo_init to non-null, go won't do it's own TLS setup
// This function can't be go:systemstack since go is not in a state where the systemcheck would work.
//
//go:nosplit
//go:norace
func x_cgo_init(g *G, setg uintptr) {
var size size_t
setg_func = setg
size = pthread_get_stacksize_np(pthread_self())
g.stacklo = uintptr(unsafe.Add(unsafe.Pointer(&size), -size+4096))
//TODO: support ios
//#if TARGET_OS_IPHONE
// darwin_arm_init_mach_exception_handler();
// darwin_arm_init_thread_exception_port();
// init_working_dir();
//#endif
}
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