PR_SET_MM_MAP                               = 0xe
	PR_SET_MM_MAP_SIZE                          = 0xf
	PR_SET_MM_START_BRK                         = 0x6
	PR_SET_MM_START_CODE                        = 0x1
	PR_SET_MM_START_DATA                        = 0x3
	PR_SET_MM_START_STACK                       = 0x5
	PR_SET_NAME                                 = 0xf
	PR_SET_NO_NEW_PRIVS                         = 0x26

	*asm = append(*asm,
		uint8(op>>8),
		(uint8(v1)<<4)|(uint8(x2)&0xf),
		(uint8(b2)<<4)|(uint8(d2>>8)&0xf),
		uint8(d2),
		(uint8(m3)<<4)|rxb(v1, 0, 0, 0),
		uint8(op))
}

func zVRV(op, v1, v2, b2, d2, m3 uint32, asm *[]byte) {
	*asm = append(*asm,
		uint8(op>>8),
		(uint8(v1)<<4)|(uint8(v2)&0xf),
		(uint8(b2)<<4)|(uint8(d2>>8)&0xf),
		uint8(d2),
		(uint8(m3)<<4)|rxb(v1, v2, 0, 0),
		uint8(op))

		if (p.From.Offset &^ int64(SYSARG4(0x7, 0xF, 0xF, 0x7))) != 0 {
			c.ctxt.Diag("illegal SYS argument\n%v", p)
		}
		o1 |= uint32(p.From.Offset)
		if p.To.Type == obj.TYPE_REG {
			o1 |= uint32(p.To.Reg & 31)
		} else {
			o1 |= 0x1F
		}

	case 51: /* dmb */
		o1 = c.opirr(p, p.As)

		if p.From.Type == obj.TYPE_CONST {
			o1 |= uint32((p.From.Offset & 0xF) << 8)
		}

	Shndx uint16
}

const Sym32Size = 16

func ST_BIND(info uint8) SymBind { return SymBind(info >> 4) }
func ST_TYPE(info uint8) SymType { return SymType(info & 0xF) }
func ST_INFO(bind SymBind, typ SymType) uint8 {
	return uint8(bind)<<4 | uint8(typ)&0xf
}
func ST_VISIBILITY(other uint8) SymVis { return SymVis(other & 3) }

/*
 * ELF64
 */

// ELF64 file header.
type Header64 struct {

		rexX = regrex[rm.Index] & Rxx
	}
	vexM := (vex >> 3) & 0x7
	vexWLP := vex & 0x87
	vexV := byte(0)
	if v != nil {
		vexV = byte(reg[v.Reg]|(regrex[v.Reg]&Rxr)<<1) & 0xF
	}
	vexV ^= 0xF
	if vexM == 1 && (rexX|rexB) == 0 && vex&vexW1 == 0 {
		// Can use 2-byte encoding.
		ab.Put2(0xc5, byte(rexR<<5)^0x80|vexV<<3|vexWLP)
	} else {
		// Must use 3-byte encoding.
		ab.Put3(0xc4,

	return op | (d&31)<<21 | (a&31)<<16 | (sbit&1)<<15 | (simm&0xF)<<11
}

/* VA-form 3-register + SHB operands */
func AOP_IRRR(op uint32, d uint32, a uint32, b uint32, simm uint32) uint32 {
	return op | (d&31)<<21 | (a&31)<<16 | (b&31)<<11 | (simm&0xF)<<6
}

/* VX-form 1-register + SIM operands */
func AOP_IR(op uint32, d uint32, simm uint32) uint32 {