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) r12() uint64 { return c.regs().gpr[12] }
func (c *sigctxt) r13() uint64 { return c.regs().gpr[13] }
func (c *sigctxt) r14() uint64 { return c.regs().gpr[14] }
func (c *sigctxt) r15() uint64 { return c.regs().gpr[15] }

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) r12() uint64 { return c.regs().gpr[12] }
func (c *sigctxt) r13() uint64 { return c.regs().gpr[13] }
func (c *sigctxt) r14() uint64 { return c.regs().gpr[14] }
func (c *sigctxt) r15() uint64 { return c.regs().gpr[15] }

	uc_link        *ucontext
	uc_stack       stackt
	__extctx       uintptr // pointer to struct __extctx but we don't use it
	__extctx_magic int32
	__pad          int32
}

type context64 struct {
	gpr        [32]uint64
	msr        uint64
	iar        uint64
	lr         uint64
	ctr        uint64
	cr         uint32
	xer        uint32
	fpscr      uint32
	fpscrx     uint32
	except     [1]uint64

const (
	_O_RDONLY    = 0x0
	_O_WRONLY    = 0x1
	_O_CREAT     = 0x40
	_O_TRUNC     = 0x200
	_O_NONBLOCK  = 0x800
	_O_CLOEXEC   = 0x80000
	_SA_RESTORER = 0
)

type ptregs struct {
	gpr       [32]uint64
	nip       uint64
	msr       uint64
	orig_gpr3 uint64
	ctr       uint64
	link      uint64
	xer       uint64
	ccr       uint64
	softe     uint64
	trap      uint64
	dar       uint64

import (
	"internal/abi"
	"internal/goarch"
	"math"
	"unsafe"
)

type sigContext struct {
	savedRegs sigcontext
}

func sigctxtSetContextRegister(ctxt *sigctxt, x uint64) {
	ctxt.regs().gpr[11] = x
}

func sigctxtAtTrapInstruction(ctxt *sigctxt) bool {
	return *(*uint32)(unsafe.Pointer(ctxt.sigpc())) == 0x7fe00008 // Trap
}

func sigctxtStatus(ctxt *sigctxt) uint64 {
	return ctxt.r20()
}

	VPERM	V3,V3,SWAP,V3
	VPERM	V4,V4,SWAP,V4
#endif

	MFVSRD	VS35,R16	// move upper doublewords of A and B into GPR for comparison
	MFVSRD	VS36,R10

	CMPU	R16,R10
	BEQ	lower
	SETB_CR0_NE(R3)
	RET

	PCALIGN $16
lower:
	VSLDOI	$8,V3,V3,V3	// move lower doublewords of A and B into GPR for comparison
	MFVSRD	VS35,R16
	VSLDOI	$8,V4,V4,V4
	MFVSRD	VS36,R10

	CMPU	R16,R10
	SETB_CR0_NE(R3)

	C_COND_EQ        // 2 result is zero
	C_COND_SO        // 3 summary overflow or FP compare w/ NaN
)

const (
	C_NONE     = iota
	C_REGP     /* An even numbered gpr which can be used a gpr pair argument */
	C_REG      /* Any gpr register */
	C_FREGP    /* An even numbered fpr which can be used a fpr pair argument */
	C_FREG     /* Any fpr register */
	C_VREG     /* Any vector register */

		[6]*argField{ap_VecReg_6_10, ap_Reg_11_15, ap_Reg_16_20}},
	{VINSHLX, 0xfc0007ff00000000, 0x1000024f00000000, 0x0, // Vector Insert Halfword from GPR using GPR-specified Left-Index VX-form (vinshlx VRT,RA,RB)
		[6]*argField{ap_VecReg_6_10, ap_Reg_11_15, ap_Reg_16_20}},

	 *  push 3 args for fn (R4, R5, R7), skipping R6.
	 * Also note that at procedure entry in gc world, 4(R29) will be the
	 *  first arg.
	 */

	// Space for 9 caller-saved GPR + LR + 6 caller-saved FPR.
	// O32 ABI allows us to smash 16 bytes argument area of caller frame.
#ifndef GOMIPS_softfloat
	SUBU	$(4*14+8*6-16), R29
#else
	SUBU	$(4*14-16), R29	// For soft-float, no FPR.
#endif

const (
	_O_RDONLY    = 0x0
	_O_WRONLY    = 0x1
	_O_CREAT     = 0x40
	_O_TRUNC     = 0x200
	_O_NONBLOCK  = 0x800
	_O_CLOEXEC   = 0x80000
	_SA_RESTORER = 0
)

type ptregs struct {
	gpr       [32]uint64
	nip       uint64
	msr       uint64
	orig_gpr3 uint64
	ctr       uint64
	link      uint64
	xer       uint64
	ccr       uint64
	softe     uint64
	trap      uint64
	dar       uint64