runtime: add support for freebsd/arm64

Based on work by Mikael Urankar, Shigeru YAMAMOTO and @myfreeweb.

Updates golang#24715

Change-Id: If3189a693ca0aa627029e22b0f91534bcf322bc0

src/runtime/defs_freebsd_arm64.go

@@ -0,0 +1,252 @@
+// created by cgo -cdefs and then converted to Go
+// cgo -cdefs defs_freebsd.go
+
+package runtime
+
+import "unsafe"
+
+const (
+	_NBBY            = 0x8
+	_CTL_MAXNAME     = 0x18
+	_CPU_LEVEL_WHICH = 0x3
+	_CPU_WHICH_PID   = 0x2
+)
+
+const (
+	_EINTR  = 0x4
+	_EFAULT = 0xe
+
+	_PROT_NONE  = 0x0
+	_PROT_READ  = 0x1
+	_PROT_WRITE = 0x2
+	_PROT_EXEC  = 0x4
+
+	_MAP_ANON    = 0x1000
+	_MAP_SHARED  = 0x1
+	_MAP_PRIVATE = 0x2
+	_MAP_FIXED   = 0x10
+
+	_MADV_FREE = 0x5
+
+	_SA_SIGINFO = 0x40
+	_SA_RESTART = 0x2
+	_SA_ONSTACK = 0x1
+
+	_CLOCK_MONOTONIC = 0x4
+	_CLOCK_REALTIME  = 0x0
+
+	_UMTX_OP_WAIT_UINT         = 0xb
+	_UMTX_OP_WAIT_UINT_PRIVATE = 0xf
+	_UMTX_OP_WAKE              = 0x3
+	_UMTX_OP_WAKE_PRIVATE      = 0x10
+
+	_SIGHUP    = 0x1
+	_SIGINT    = 0x2
+	_SIGQUIT   = 0x3
+	_SIGILL    = 0x4
+	_SIGTRAP   = 0x5
+	_SIGABRT   = 0x6
+	_SIGEMT    = 0x7
+	_SIGFPE    = 0x8
+	_SIGKILL   = 0x9
+	_SIGBUS    = 0xa
+	_SIGSEGV   = 0xb
+	_SIGSYS    = 0xc
+	_SIGPIPE   = 0xd
+	_SIGALRM   = 0xe
+	_SIGTERM   = 0xf
+	_SIGURG    = 0x10
+	_SIGSTOP   = 0x11
+	_SIGTSTP   = 0x12
+	_SIGCONT   = 0x13
+	_SIGCHLD   = 0x14
+	_SIGTTIN   = 0x15
+	_SIGTTOU   = 0x16
+	_SIGIO     = 0x17
+	_SIGXCPU   = 0x18
+	_SIGXFSZ   = 0x19
+	_SIGVTALRM = 0x1a
+	_SIGPROF   = 0x1b
+	_SIGWINCH  = 0x1c
+	_SIGINFO   = 0x1d
+	_SIGUSR1   = 0x1e
+	_SIGUSR2   = 0x1f
+
+	_FPE_INTDIV = 0x2
+	_FPE_INTOVF = 0x1
+	_FPE_FLTDIV = 0x3
+	_FPE_FLTOVF = 0x4
+	_FPE_FLTUND = 0x5
+	_FPE_FLTRES = 0x6
+	_FPE_FLTINV = 0x7
+	_FPE_FLTSUB = 0x8
+
+	_BUS_ADRALN = 0x1
+	_BUS_ADRERR = 0x2
+	_BUS_OBJERR = 0x3
+
+	_SEGV_MAPERR = 0x1
+	_SEGV_ACCERR = 0x2
+
+	_ITIMER_REAL    = 0x0
+	_ITIMER_VIRTUAL = 0x1
+	_ITIMER_PROF    = 0x2
+
+	_EV_ADD       = 0x1
+	_EV_DELETE    = 0x2
+	_EV_CLEAR     = 0x20
+	_EV_RECEIPT   = 0x40
+	_EV_ERROR     = 0x4000
+	_EV_EOF       = 0x8000
+	_EVFILT_READ  = -0x1
+	_EVFILT_WRITE = -0x2
+)
+
+type rtprio struct {
+	_type uint16
+	prio  uint16
+}
+
+type thrparam struct {
+	start_func uintptr
+	arg        unsafe.Pointer
+	stack_base uintptr
+	stack_size uintptr
+	tls_base   unsafe.Pointer
+	tls_size   uintptr
+	child_tid  unsafe.Pointer // *int64
+	parent_tid *int64
+	flags      int32
+	pad_cgo_0  [4]byte
+	rtp        *rtprio
+	spare      [3]uintptr
+}
+
+type sigset struct {
+	__bits [4]uint32
+}
+
+type stackt struct {
+	ss_sp     uintptr
+	ss_size   uintptr
+	ss_flags  int32
+	pad_cgo_0 [4]byte
+}
+
+type siginfo struct {
+	si_signo  int32
+	si_errno  int32
+	si_code   int32
+	si_pid    int32
+	si_uid    uint32
+	si_status int32
+	si_addr   uint64
+	si_value  [8]byte
+	_reason   [40]byte
+}
+
+type gpregs struct {
+	gp_x    [30]uint64
+	gp_lr   uint64
+	gp_sp   uint64
+	gp_elr  uint64
+	gp_spsr uint32
+	gp_pad  int32
+}
+
+type fpregs struct {
+	fp_q     [64]uint64 // actually [32]uint128
+	fp_sr    uint32
+	fp_cr    uint32
+	fp_flags int32
+	fp_pad   int32
+}
+
+type mcontext struct {
+	mc_gpregs gpregs
+	mc_fpregs fpregs
+	mc_flags  int32
+	mc_pad    int32
+	mc_spare  [8]uint64
+}
+
+type ucontext struct {
+	uc_sigmask  sigset
+	uc_mcontext mcontext
+	uc_link     *ucontext
+	uc_stack    stackt
+	uc_flags    int32
+	__spare__   [4]int32
+	pad_cgo_0   [12]byte
+}
+
+type timespec struct {
+	tv_sec  int64
+	tv_nsec int64
+}
+
+//go:nosplit
+func (ts *timespec) setNsec(ns int64) {
+	ts.tv_sec = ns / 1e9
+	ts.tv_nsec = ns % 1e9
+}
+
+type timeval struct {
+	tv_sec  int64
+	tv_usec int64
+}
+
+func (tv *timeval) set_usec(x int32) {
+	tv.tv_usec = int64(x)
+}
+
+type itimerval struct {
+	it_interval timeval
+	it_value    timeval
+}
+
+type umtx_time struct {
+	_timeout timespec
+	_flags   uint32
+	_clockid uint32
+}
+
+type keventt struct {
+	ident  uint64
+	filter int16
+	flags  uint16
+	fflags uint32
+	data   int64
+	udata  *byte
+}
+
+type bintime struct {
+	sec  int64
+	frac uint64
+}
+
+type vdsoTimehands struct {
+	algo         uint32
+	gen          uint32
+	scale        uint64
+	offset_count uint32
+	counter_mask uint32
+	offset       bintime
+	boottime     bintime
+	physical     uint32
+	res          [7]uint32
+}
+
+type vdsoTimekeep struct {
+	ver       uint32
+	enabled   uint32
+	current   uint32
+	pad_cgo_0 [4]byte
+}
+
+const (
+	_VDSO_TK_VER_CURR = 0x1
+
+	vdsoTimehandsSize = 0x58
+	vdsoTimekeepSize  = 0x10
+)