예제 #1
0
파일: obj6.go 프로젝트: duhaibo0404/go-1
func nacladdr(ctxt *obj.Link, p *obj.Prog, a *obj.Addr) {
	if p.As == ALEAL || p.As == ALEAQ {
		return
	}

	if a.Reg == REG_BP {
		ctxt.Diag("invalid address: %v", p)
		return
	}

	if a.Reg == REG_TLS {
		a.Reg = REG_BP
	}
	if a.Type == obj.TYPE_MEM && a.Name == obj.NAME_NONE {
		switch a.Reg {
		// all ok
		case REG_BP, REG_SP, REG_R15:
			break

		default:
			if a.Index != REG_NONE {
				ctxt.Diag("invalid address %v", p)
			}
			a.Index = a.Reg
			if a.Index != REG_NONE {
				a.Scale = 1
			}
			a.Reg = REG_R15
		}
	}
}
예제 #2
0
파일: obj6.go 프로젝트: achanda/go
func indir_cx(ctxt *obj.Link, p *obj.Prog, a *obj.Addr) {
	if ctxt.Headtype == obj.Hnacl && p.Mode == 64 {
		a.Type = obj.TYPE_MEM
		a.Reg = REG_R15
		a.Index = REG_CX
		a.Scale = 1
		return
	}

	a.Type = obj.TYPE_MEM
	a.Reg = REG_CX
}
예제 #3
0
// registerIndirect parses the general form of a register indirection.
// It is can be (R1), (R2*scale), or (R1)(R2*scale) where R1 may be a simple
// register or register pair R:R or (R, R) or (R+R).
// Or it might be a pseudo-indirection like (FP).
// We are sitting on the opening parenthesis.
func (p *Parser) registerIndirect(a *obj.Addr, prefix rune) {
	p.get('(')
	tok := p.next()
	name := tok.String()
	r1, r2, scale, ok := p.register(name, 0)
	if !ok {
		p.errorf("indirect through non-register %s", tok)
	}
	p.get(')')
	a.Type = obj.TYPE_MEM
	if r1 < 0 {
		// Pseudo-register reference.
		if r2 != 0 {
			p.errorf("cannot use pseudo-register in pair")
			return
		}
		// For SB, SP, and FP, there must be a name here. 0(FP) is not legal.
		if name != "PC" && a.Name == obj.NAME_NONE {
			p.errorf("cannot reference %s without a symbol", name)
		}
		p.setPseudoRegister(a, name, false, prefix)
		return
	}
	a.Reg = r1
	if r2 != 0 {
		// TODO: Consistency in the encoding would be nice here.
		if p.arch.Thechar == '5' || p.arch.Thechar == '7' {
			// Special form
			// ARM: destination register pair (R1, R2).
			// ARM64: register pair (R1, R2) for LDP/STP.
			if prefix != 0 || scale != 0 {
				p.errorf("illegal address mode for register pair")
				return
			}
			a.Type = obj.TYPE_REGREG
			a.Offset = int64(r2)
			// Nothing may follow
			return
		}
		if p.arch.Thechar == '9' {
			// Special form for PPC64: (R1+R2); alias for (R1)(R2*1).
			if prefix != 0 || scale != 0 {
				p.errorf("illegal address mode for register+register")
				return
			}
			a.Type = obj.TYPE_MEM
			a.Scale = 1
			a.Index = r2
			// Nothing may follow.
			return
		}
	}
	if r2 != 0 {
		p.errorf("indirect through register pair")
	}
	if prefix == '$' {
		a.Type = obj.TYPE_ADDR
	}
	if r1 == arch.RPC && prefix != 0 {
		p.errorf("illegal addressing mode for PC")
	}
	if scale == 0 && p.peek() == '(' {
		// General form (R)(R*scale).
		p.next()
		tok := p.next()
		r1, r2, scale, ok = p.register(tok.String(), 0)
		if !ok {
			p.errorf("indirect through non-register %s", tok)
		}
		if r2 != 0 {
			p.errorf("unimplemented two-register form")
		}
		a.Index = r1
		a.Scale = int16(scale)
		p.get(')')
	} else if scale != 0 {
		// First (R) was missing, all we have is (R*scale).
		a.Reg = 0
		a.Index = r1
		a.Scale = int16(scale)
	}
}