ARM64.HasCPUID = isSet(HWCap, hwcap_CPUID)
	ARM64.HasSHA512 = isSet(HWCap, hwcap_SHA512)

	// The Samsung S9+ kernel reports support for atomics, but not all cores
	// actually support them, resulting in SIGILL. See issue #28431.
	// TODO(elias.naur): Only disable the optimization on bad chipsets on android.
	ARM64.HasATOMICS = isSet(HWCap, hwcap_ATOMICS) && os != "android"

	MADV_FREE     = C.MADV_FREE

	SA_SIGINFO = C.SA_SIGINFO
	SA_RESTART = C.SA_RESTART
	SA_ONSTACK = C.SA_ONSTACK

	SIGHUP    = C.SIGHUP
	SIGINT    = C.SIGINT
	SIGQUIT   = C.SIGQUIT
	SIGILL    = C.SIGILL
	SIGTRAP   = C.SIGTRAP
	SIGABRT   = C.SIGABRT
	SIGEMT    = C.SIGEMT
	SIGFPE    = C.SIGFPE
	SIGKILL   = C.SIGKILL
	SIGBUS    = C.SIGBUS
	SIGSEGV   = C.SIGSEGV
	SIGSYS    = C.SIGSYS
	SIGPIPE   = C.SIGPIPE

	MADV_FREE     = C.MADV_FREE

	SA_SIGINFO = C.SA_SIGINFO
	SA_RESTART = C.SA_RESTART
	SA_ONSTACK = C.SA_ONSTACK

	SIGHUP    = C.SIGHUP
	SIGINT    = C.SIGINT
	SIGQUIT   = C.SIGQUIT
	SIGILL    = C.SIGILL
	SIGTRAP   = C.SIGTRAP
	SIGABRT   = C.SIGABRT
	SIGEMT    = C.SIGEMT
	SIGFPE    = C.SIGFPE
	SIGKILL   = C.SIGKILL
	SIGBUS    = C.SIGBUS
	SIGSEGV   = C.SIGSEGV
	SIGSYS    = C.SIGSYS
	SIGPIPE   = C.SIGPIPE

	SA_RESTART   = C.SA_RESTART
	SA_ONSTACK   = C.SA_ONSTACK
	SA_USERTRAMP = C.SA_USERTRAMP
	SA_64REGSET  = C.SA_64REGSET

	SIGHUP    = C.SIGHUP
	SIGINT    = C.SIGINT
	SIGQUIT   = C.SIGQUIT
	SIGILL    = C.SIGILL
	SIGTRAP   = C.SIGTRAP
	SIGABRT   = C.SIGABRT
	SIGEMT    = C.SIGEMT
	SIGFPE    = C.SIGFPE
	SIGKILL   = C.SIGKILL
	SIGBUS    = C.SIGBUS
	SIGSEGV   = C.SIGSEGV
	SIGSYS    = C.SIGSYS
	SIGPIPE   = C.SIGPIPE

	UMTX_OP_WAKE              = C.UMTX_OP_WAKE
	UMTX_OP_WAKE_PRIVATE      = C.UMTX_OP_WAKE_PRIVATE

	SIGHUP    = C.SIGHUP
	SIGINT    = C.SIGINT
	SIGQUIT   = C.SIGQUIT
	SIGILL    = C.SIGILL
	SIGTRAP   = C.SIGTRAP
	SIGABRT   = C.SIGABRT
	SIGEMT    = C.SIGEMT
	SIGFPE    = C.SIGFPE
	SIGKILL   = C.SIGKILL
	SIGBUS    = C.SIGBUS
	SIGSEGV   = C.SIGSEGV
	SIGSYS    = C.SIGSYS
	SIGPIPE   = C.SIGPIPE

		// trap into the kernel and then return back to userspace.
		//
		// But on older kernels, such as Linux 4.4.180 as used on many Synology
		// devices, calling readARM64Registers (specifically getisar0) will
		// cause a SIGILL and we'll die. So for older kernels, parse /proc/cpuinfo
		// instead.
		//
		// See golang/go#57336.
		if linuxKernelCanEmulateCPUID() {
			readARM64Registers()
		} else {
			readLinuxProcCPUInfo()
		}

with a stack dump by pressing ^\.

# Default behavior of signals in Go programs

By default, a synchronous signal is converted into a run-time panic. A
SIGHUP, SIGINT, or SIGTERM signal causes the program to exit. A
SIGQUIT, SIGILL, SIGTRAP, SIGABRT, SIGSTKFLT, SIGEMT, or SIGSYS signal
causes the program to exit with a stack dump. A SIGTSTP, SIGTTIN, or
SIGTTOU signal gets the system default behavior (these signals are

}

// A Signal is a number describing a process signal.
// It implements the [os.Signal] interface.
type Signal uint8

const (
	SIGNONE Signal = iota
	SIGHUP
	SIGINT
	SIGQUIT
	SIGILL
	SIGTRAP
	SIGABRT
	SIGBUS
	SIGFPE
	SIGKILL
	SIGUSR1
	SIGSEGV
	SIGUSR2
	SIGPIPE
	SIGALRM
	SIGTERM
	SIGCHLD
	SIGCONT
	SIGSTOP
	SIGTSTP
	SIGTTIN
	SIGTTOU

	EINTRNODATA        = Errno(1159)
	ENOREUSE           = Errno(1160)
	ENOMOVE            = Errno(1161)
)

// Signals
const (
	SIGHUP    = Signal(1)
	SIGINT    = Signal(2)
	SIGABRT   = Signal(3)
	SIGILL    = Signal(4)
	SIGPOLL   = Signal(5)
	SIGURG    = Signal(6)
	SIGSTOP   = Signal(7)
	SIGFPE    = Signal(8)
	SIGKILL   = Signal(9)
	SIGBUS    = Signal(10)
	SIGSEGV   = Signal(11)
	SIGSYS    = Signal(12)

}

// Signal table
var signalList = [...]struct {
	num  syscall.Signal
	name string
	desc string
}{
	{1, "SIGHUP", "hangup"},
	{2, "SIGINT", "interrupt"},
	{3, "SIGQUIT", "quit"},
	{4, "SIGILL", "illegal instruction"},
	{5, "SIGTRAP", "trace/breakpoint trap"},
	{6, "SIGABRT", "aborted"},
	{7, "SIGBUS", "bus error"},
	{8, "SIGFPE", "floating point exception"},
	{9, "SIGKILL", "killed"},