uc_sigmask   usigset
	__fpregs_mem fpstate
}

type sigcontext struct {
	r8          uint64
	r9          uint64
	r10         uint64
	r11         uint64
	r12         uint64
	r13         uint64
	r14         uint64
	r15         uint64
	rdi         uint64
	rsi         uint64
	rbp         uint64
	rbx         uint64
	rdx         uint64
	rax         uint64
	rcx         uint64

// Must obey the gcc calling convention.
TEXT _cgo_topofstack(SB),NOSPLIT|NOFRAME,$0
	// g (R13), R10, R11 and LR (R14) are callee-save in the C ABI, so save them
	MOVD	g, R1
	MOVD	R10, R3
	MOVD	LR, R4
	MOVD	R11, R5

	BL	runtime·load_g(SB)	// clobbers g (R13), R10, R11
	MOVD	g_m(g), R2
	MOVD	m_curg(R2), R2
	MOVD	(g_stack+stack_hi)(R2), R2

	MOVD	R1, g
	MOVD	R3, R10

	// Set the two remaining arguments now.
	MOVD	runtime·cgoTraceback(SB), R3
	MOVD	$runtime·sigtramp(SB), R5
	MOVD	_cgo_callers(SB), R13
	MOVD	R10, LR // restore
	MOVD	R11, R27
	MOVD	R12, g
	B	(R13)

sigtramp:
	MOVD	R10, LR // restore
	MOVD	R11, R27
	MOVD	R12, g
	B	runtime·sigtramp(SB)

sigtrampnog:

	"R9B",
	"R10B",
	"R11B",
	"R12B",
	"R13B",
	"R14B",
	"R15B",
	"AX", // [D_AX]
	"CX",
	"DX",
	"BX",
	"SP",
	"BP",
	"SI",
	"DI",
	"R8",
	"R9",
	"R10",
	"R11",
	"R12",
	"R13",
	"R14",
	"R15",
	"AH",
	"CH",
	"DH",
	"BH",
	"F0", // [D_F0]
	"F1",
	"F2",
	"F3",
	"F4",
	"F5",
	"F6",
	"F7",
	"M0",
	"M1",
	"M2",
	"M3",
	"M4",
	"M5",
	"M6",

func (c *sigctxt) r11() uint32       { return uint32(c.regs().sc_regs[11]) }
func (c *sigctxt) r12() uint32       { return uint32(c.regs().sc_regs[12]) }
func (c *sigctxt) r13() uint32       { return uint32(c.regs().sc_regs[13]) }
func (c *sigctxt) r14() uint32       { return uint32(c.regs().sc_regs[14]) }
func (c *sigctxt) r15() uint32       { return uint32(c.regs().sc_regs[15]) }

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) r16() uint64 { return c.regs().gpr[16] }

func (c *sigctxt) r10() uint64 { return c.regs().sc_reg[10] }
func (c *sigctxt) r11() uint64 { return c.regs().sc_reg[11] }
func (c *sigctxt) r12() uint64 { return c.regs().sc_reg[12] }
func (c *sigctxt) r13() uint64 { return c.regs().sc_reg[13] }
func (c *sigctxt) r14() uint64 { return c.regs().sc_reg[14] }
func (c *sigctxt) r15() uint64 { return c.regs().sc_reg[15] }
func (c *sigctxt) r16() uint64 { return c.regs().sc_reg[16] }

	rbx    uint64
	rcx    uint64
	rdx    uint64
	rdi    uint64
	rsi    uint64
	rbp    uint64
	rsp    uint64
	r8     uint64
	r9     uint64
	r10    uint64
	r11    uint64
	r12    uint64
	r13    uint64
	r14    uint64
	r15    uint64
	rip    uint64
	rflags uint64
	cs     uint64
	fs     uint64
	gs     uint64
}

type floatstate64 struct {
	fpu_reserved  [2]int32

DEFINE_PPC64X_FUNCDESC(_rt0_ppc64_aix, __start<>)

// The starting function must return in the loader to
// initialise some libraries, especially libthread which
// creates the main thread and adds the TLS in R13
// R19 contains a function descriptor to the loader function
// which needs to be called.
// This code is similar to the __start function in C
TEXT __start<>(SB),NOSPLIT,$-8
	XOR R0, R0
	MOVD $libc___n_pthreads(SB), R4

Examples:

	CCMP MI, R22, $12, $13     <=>    ccmp x22, #0xc, #0xd, mi
	CCMNW AL, R1, $11, $8      <=>    ccmn w1, #0xb, #0x8, al

(7) CCMN, CCMNW, CCMP, CCMPW <cond>, <Rn>, <Rm>, $<nzcv>

Examples:

	CCMN VS, R13, R22, $10     <=>    ccmn x13, x22, #0xa, vs
	CCMPW HS, R19, R14, $11    <=>    ccmp w19, w14, #0xb, cs

(9) CSEL, CSELW, CSNEG, CSNEGW, CSINC, CSINCW <cond>, <Rn>, <Rm>, <Rd> ;
FCSELD, FCSELS <cond>, <Fn>, <Fm>, <Fd>