73 lines
1.8 KiB
Go
73 lines
1.8 KiB
Go
// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// This file encapsulates some of the odd characteristics of the
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// MIPS (MIPS64) instruction set, to minimize its interaction
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// with the core of the assembler.
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package arch
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import (
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"github.com/twitchyliquid64/golang-asm/obj"
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"github.com/twitchyliquid64/golang-asm/obj/mips"
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)
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func jumpMIPS(word string) bool {
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switch word {
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case "BEQ", "BFPF", "BFPT", "BGEZ", "BGEZAL", "BGTZ", "BLEZ", "BLTZ", "BLTZAL", "BNE", "JMP", "JAL", "CALL":
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return true
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}
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return false
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}
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// IsMIPSCMP reports whether the op (as defined by an mips.A* constant) is
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// one of the CMP instructions that require special handling.
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func IsMIPSCMP(op obj.As) bool {
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switch op {
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case mips.ACMPEQF, mips.ACMPEQD, mips.ACMPGEF, mips.ACMPGED,
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mips.ACMPGTF, mips.ACMPGTD:
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return true
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}
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return false
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}
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// IsMIPSMUL reports whether the op (as defined by an mips.A* constant) is
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// one of the MUL/DIV/REM/MADD/MSUB instructions that require special handling.
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func IsMIPSMUL(op obj.As) bool {
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switch op {
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case mips.AMUL, mips.AMULU, mips.AMULV, mips.AMULVU,
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mips.ADIV, mips.ADIVU, mips.ADIVV, mips.ADIVVU,
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mips.AREM, mips.AREMU, mips.AREMV, mips.AREMVU,
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mips.AMADD, mips.AMSUB:
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return true
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}
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return false
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}
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func mipsRegisterNumber(name string, n int16) (int16, bool) {
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switch name {
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case "F":
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if 0 <= n && n <= 31 {
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return mips.REG_F0 + n, true
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}
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case "FCR":
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if 0 <= n && n <= 31 {
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return mips.REG_FCR0 + n, true
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}
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case "M":
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if 0 <= n && n <= 31 {
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return mips.REG_M0 + n, true
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}
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case "R":
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if 0 <= n && n <= 31 {
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return mips.REG_R0 + n, true
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}
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case "W":
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if 0 <= n && n <= 31 {
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return mips.REG_W0 + n, true
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}
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}
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return 0, false
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}
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