系统调用go version 1.15.6
_Prunning_Psyscall
Pexitsyscall()进入系统调用
// Standard syscall entry used by the go syscall library and normal cgo calls.
//
// This is exported via linkname to assembly in the syscall package.
//
//go:nosplit
//go:linkname entersyscall
func entersyscall() {
reentersyscall(getcallerpc(), getcallersp())
}
syscallcgoentersyscall()go:linkname