func (c *sigctxt) r5() uint64  { return c.regs().gpr[5] }
func (c *sigctxt) r6() uint64  { return c.regs().gpr[6] }
func (c *sigctxt) r7() uint64  { return c.regs().gpr[7] }
func (c *sigctxt) r8() uint64  { return c.regs().gpr[8] }
func (c *sigctxt) r9() uint64  { return c.regs().gpr[9] }
func (c *sigctxt) r10() uint64 { return c.regs().gpr[10] }
func (c *sigctxt) r11() uint64 { return c.regs().gpr[11] }

func (c *sigctxt) t2() uint64  { return c.regs().mc_gpregs.gp_t[2] }
func (c *sigctxt) s0() uint64  { return c.regs().mc_gpregs.gp_s[0] }
func (c *sigctxt) s1() uint64  { return c.regs().mc_gpregs.gp_s[1] }
func (c *sigctxt) a0() uint64  { return c.regs().mc_gpregs.gp_a[0] }
func (c *sigctxt) a1() uint64  { return c.regs().mc_gpregs.gp_a[1] }
func (c *sigctxt) a2() uint64  { return c.regs().mc_gpregs.gp_a[2] }

func (c *sigctxt) r12() uint64 { return (uint64)(c.regs().sc_x[12]) }
func (c *sigctxt) r13() uint64 { return (uint64)(c.regs().sc_x[13]) }
func (c *sigctxt) r14() uint64 { return (uint64)(c.regs().sc_x[14]) }
func (c *sigctxt) r15() uint64 { return (uint64)(c.regs().sc_x[15]) }
func (c *sigctxt) r16() uint64 { return (uint64)(c.regs().sc_x[16]) }
func (c *sigctxt) r17() uint64 { return (uint64)(c.regs().sc_x[17]) }

func (c *sigctxt) t2() uint64  { return uint64(c.regs().sc_t[2]) }
func (c *sigctxt) s0() uint64  { return uint64(c.regs().sc_s[0]) }
func (c *sigctxt) s1() uint64  { return uint64(c.regs().sc_s[1]) }
func (c *sigctxt) a0() uint64  { return uint64(c.regs().sc_a[0]) }
func (c *sigctxt) a1() uint64  { return uint64(c.regs().sc_a[1]) }
func (c *sigctxt) a2() uint64  { return uint64(c.regs().sc_a[2]) }

func (c *sigctxt) r19() uint64 { return c.regs().mc_gpregs.gp_x[19] }
func (c *sigctxt) r20() uint64 { return c.regs().mc_gpregs.gp_x[20] }
func (c *sigctxt) r21() uint64 { return c.regs().mc_gpregs.gp_x[21] }
func (c *sigctxt) r22() uint64 { return c.regs().mc_gpregs.gp_x[22] }
func (c *sigctxt) r23() uint64 { return c.regs().mc_gpregs.gp_x[23] }
func (c *sigctxt) r24() uint64 { return c.regs().mc_gpregs.gp_x[24] }

func (c *sigctxt) rsi() uint64 { return c.regs().__gregs[_REG_RSI] }
func (c *sigctxt) rbp() uint64 { return c.regs().__gregs[_REG_RBP] }
func (c *sigctxt) rsp() uint64 { return c.regs().__gregs[_REG_RSP] }
func (c *sigctxt) r8() uint64  { return c.regs().__gregs[_REG_R8] }
func (c *sigctxt) r9() uint64  { return c.regs().__gregs[_REG_R9] }
func (c *sigctxt) r10() uint64 { return c.regs().__gregs[_REG_R10] }

	return ptracePtr(PTRACE_GETREGS, pid, 0, unsafe.Pointer(regsout))
}

// PtraceSetRegsArm sets the registers used by arm binaries.
func PtraceSetRegsArm(pid int, regs *PtraceRegsArm) error {
	return ptracePtr(PTRACE_SETREGS, pid, 0, unsafe.Pointer(regs))
}

// PtraceRegsArm64 is the registers used by arm64 binaries.
type PtraceRegsArm64 struct {
	Regs   [31]uint64
	Sp     uint64
	Pc     uint64
	Pstate uint64
}

}

// PtraceSetRegsMipsle sets the registers used by mipsle binaries.
func PtraceSetRegsMipsle(pid int, regs *PtraceRegsMipsle) error {
	return ptracePtr(PTRACE_SETREGS, pid, 0, unsafe.Pointer(regs))
}

// PtraceRegsMips64le is the registers used by mips64le binaries.
type PtraceRegsMips64le struct {
	Regs     [32]uint64
	Lo       uint64
	Hi       uint64
	Epc      uint64

	if d == 0 {
		d = defaultTCPKeepAliveIdle
	} else if d < 0 {
		return nil
	}

	// The kernel expects seconds so round to next highest second.
	secs := int(roundDurationUp(d, time.Second))
	err := fd.pfd.SetsockoptInt(syscall.IPPROTO_TCP, syscall.TCP_KEEPALIVE, secs)
	runtime.KeepAlive(fd)
	return wrapSyscallError("setsockopt", err)
}

func setKeepAliveInterval(fd *netFD, d time.Duration) error {
	if d == 0 {

func PtraceGetRegs386(pid int, regsout *PtraceRegs386) error {
	return ptracePtr(PTRACE_GETREGS, pid, 0, unsafe.Pointer(regsout))
}

// PtraceSetRegs386 sets the registers used by 386 binaries.
func PtraceSetRegs386(pid int, regs *PtraceRegs386) error {
	return ptracePtr(PTRACE_SETREGS, pid, 0, unsafe.Pointer(regs))
}

// PtraceRegsAmd64 is the registers used by amd64 binaries.
type PtraceRegsAmd64 struct {
	R15      uint64
	R14      uint64