q.Spadj = -aoffset
				q.Pos = p.Pos
				q.Link = p.Link
				p.Link = q
				p = q
			}

			// If enabled, this code emits 'MOV PC, R27' before every 'MOV LR, PC',
			// so that if you are debugging a low-level crash where PC and LR are zero,
			// you can look at R27 to see what jumped to the zero.
			// This is useful when bringing up Go on a new system.
			// (There is similar code in ../ppc64/obj9.go:/if.false.)

func (c *sigctxt) r24() uint64 { return c.regs().gpr[24] }
func (c *sigctxt) r25() uint64 { return c.regs().gpr[25] }
func (c *sigctxt) r26() uint64 { return c.regs().gpr[26] }
func (c *sigctxt) r27() uint64 { return c.regs().gpr[27] }
func (c *sigctxt) r28() uint64 { return c.regs().gpr[28] }
func (c *sigctxt) r29() uint64 { return c.regs().gpr[29] }
func (c *sigctxt) r30() uint64 { return c.regs().gpr[30] }

func (c *sigctxt) r24() uint64 { return c.regs().sc_reg[24] }
func (c *sigctxt) r25() uint64 { return c.regs().sc_reg[25] }
func (c *sigctxt) r26() uint64 { return c.regs().sc_reg[26] }
func (c *sigctxt) r27() uint64 { return c.regs().sc_reg[27] }
func (c *sigctxt) r28() uint64 { return c.regs().sc_reg[28] }
func (c *sigctxt) r29() uint64 { return c.regs().sc_reg[29] }
func (c *sigctxt) r30() uint64 { return c.regs().sc_reg[30] }

	print("r21  ", hex(r.x[21]), "\n")
	print("r22  ", hex(r.x[22]), "\n")
	print("r23  ", hex(r.x[23]), "\n")
	print("r24  ", hex(r.x[24]), "\n")
	print("r25  ", hex(r.x[25]), "\n")
	print("r26  ", hex(r.x[26]), "\n")
	print("r27  ", hex(r.x[27]), "\n")
	print("r28  ", hex(r.x[28]), "\n")
	print("r29  ", hex(r.x[29]), "\n")
	print("lr   ", hex(r.x[30]), "\n")
	print("sp   ", hex(r.xsp), "\n")
	print("pc   ", hex(r.pc), "\n")

func (c *sigctxt) r24() uint64 { return c.regs().mc_gpregs.gp_x[24] }
func (c *sigctxt) r25() uint64 { return c.regs().mc_gpregs.gp_x[25] }
func (c *sigctxt) r26() uint64 { return c.regs().mc_gpregs.gp_x[26] }
func (c *sigctxt) r27() uint64 { return c.regs().mc_gpregs.gp_x[27] }
func (c *sigctxt) r28() uint64 { return c.regs().mc_gpregs.gp_x[28] }
func (c *sigctxt) r29() uint64 { return c.regs().mc_gpregs.gp_x[29] }

func (c *sigctxt) r24() uint64 { return (uint64)(c.regs().sc_x[24]) }
func (c *sigctxt) r25() uint64 { return (uint64)(c.regs().sc_x[25]) }
func (c *sigctxt) r26() uint64 { return (uint64)(c.regs().sc_x[26]) }
func (c *sigctxt) r27() uint64 { return (uint64)(c.regs().sc_x[27]) }
func (c *sigctxt) r28() uint64 { return (uint64)(c.regs().sc_x[28]) }
func (c *sigctxt) r29() uint64 { return (uint64)(c.regs().sc_x[29]) }

	// can be executed on g0. Second, it is called frequently, so will
	// benefit from this fast path.
	CBNZ	R0, rest
	MOVD	g, R13
#ifdef TLS_darwin
	MOVD	R27, R12 // save R27 a.k.a. REGTMP (callee-save in C). load_g clobbers it
#endif
	load_g
#ifdef TLS_darwin
	MOVD	R12, R27
#endif
	MOVD	g_m(g), R0
	MOVD	m_p(R0), R0
	MOVD	p_raceprocctx(R0), R0
	MOVD	R0, (R1)
	MOVD	R13, g
	JMP	(LR)
rest:

	RLDICL	$56,R7,$56,R25	// crc>>8
	ADD	$1024,R10,R10	// &tab[6]
	SLD	$2,R25,R25	// crc>>8&FF*2
	MOVBZ   R7,R26          // crc&0xFF
	MOVWZ	(R10)(R25),R27	// tab[6][crc>>8&0xFF]
	ADD 	$1024,R10,R10   // &tab[7]
	SLD	$2,R26,R26	// crc&0xFF*2
	XOR	R21,R27,R21	// xor done R27
	ADD     $8,R5           // p = p[8:]
	MOVWZ	(R10)(R26),R28	// tab[7][crc&0xFF]
	XOR	R21,R28,R21	// xor done R28
	MOVWZ	R21,R7		// crc for next round

func (c *sigctxt) r25() uint32       { return uint32(c.regs().sc_regs[25]) }
func (c *sigctxt) r26() uint32       { return uint32(c.regs().sc_regs[26]) }
func (c *sigctxt) r27() uint32       { return uint32(c.regs().sc_regs[27]) }
func (c *sigctxt) r28() uint32       { return uint32(c.regs().sc_regs[28]) }
func (c *sigctxt) r29() uint32       { return uint32(c.regs().sc_regs[29]) }

(2) MADD, MADDW, MSUB, MSUBW, SMADDL, SMSUBL, UMADDL, UMSUBL <Rm>, <Ra>, <Rn>, <Rd>

Examples:

	MADD R2, R30, R22, R6       <=>    madd x6, x22, x2, x30
	SMSUBL R10, R3, R17, R27    <=>    smsubl x27, w17, w10, x3

(3) FMADDD, FMADDS, FMSUBD, FMSUBS, FNMADDD, FNMADDS, FNMSUBD, FNMSUBS <Fm>, <Fa>, <Fn>, <Fd>

Examples:

	FMADDD F30, F20, F3, F29    <=>    fmadd d29, d3, d30, d20