mirror of
https://github.com/42wim/matterbridge.git
synced 2024-11-16 08:59:27 +01:00
165 lines
3.5 KiB
Go
165 lines
3.5 KiB
Go
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// Copyright 2014 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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package armasm
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import (
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"bytes"
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"fmt"
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"strings"
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)
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var saveDot = strings.NewReplacer(
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".F16", "_dot_F16",
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".F32", "_dot_F32",
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".F64", "_dot_F64",
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".S32", "_dot_S32",
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".U32", "_dot_U32",
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".FXS", "_dot_S",
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".FXU", "_dot_U",
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".32", "_dot_32",
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)
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// GNUSyntax returns the GNU assembler syntax for the instruction, as defined by GNU binutils.
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// This form typically matches the syntax defined in the ARM Reference Manual.
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func GNUSyntax(inst Inst) string {
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var buf bytes.Buffer
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op := inst.Op.String()
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op = saveDot.Replace(op)
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op = strings.Replace(op, ".", "", -1)
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op = strings.Replace(op, "_dot_", ".", -1)
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op = strings.ToLower(op)
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buf.WriteString(op)
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sep := " "
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for i, arg := range inst.Args {
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if arg == nil {
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break
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}
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text := gnuArg(&inst, i, arg)
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if text == "" {
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continue
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}
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buf.WriteString(sep)
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sep = ", "
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buf.WriteString(text)
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}
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return buf.String()
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}
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func gnuArg(inst *Inst, argIndex int, arg Arg) string {
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switch inst.Op &^ 15 {
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case LDRD_EQ, LDREXD_EQ, STRD_EQ:
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if argIndex == 1 {
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// second argument in consecutive pair not printed
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return ""
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}
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case STREXD_EQ:
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if argIndex == 2 {
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// second argument in consecutive pair not printed
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return ""
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}
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}
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switch arg := arg.(type) {
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case Imm:
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switch inst.Op &^ 15 {
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case BKPT_EQ:
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return fmt.Sprintf("%#04x", uint32(arg))
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case SVC_EQ:
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return fmt.Sprintf("%#08x", uint32(arg))
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}
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return fmt.Sprintf("#%d", int32(arg))
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case ImmAlt:
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return fmt.Sprintf("#%d, %d", arg.Val, arg.Rot)
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case Mem:
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R := gnuArg(inst, -1, arg.Base)
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X := ""
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if arg.Sign != 0 {
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X = ""
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if arg.Sign < 0 {
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X = "-"
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}
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X += gnuArg(inst, -1, arg.Index)
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if arg.Shift == ShiftLeft && arg.Count == 0 {
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// nothing
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} else if arg.Shift == RotateRightExt {
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X += ", rrx"
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} else {
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X += fmt.Sprintf(", %s #%d", strings.ToLower(arg.Shift.String()), arg.Count)
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}
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} else {
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X = fmt.Sprintf("#%d", arg.Offset)
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}
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switch arg.Mode {
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case AddrOffset:
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if X == "#0" {
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return fmt.Sprintf("[%s]", R)
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}
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return fmt.Sprintf("[%s, %s]", R, X)
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case AddrPreIndex:
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return fmt.Sprintf("[%s, %s]!", R, X)
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case AddrPostIndex:
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return fmt.Sprintf("[%s], %s", R, X)
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case AddrLDM:
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if X == "#0" {
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return R
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}
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case AddrLDM_WB:
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if X == "#0" {
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return R + "!"
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}
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}
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return fmt.Sprintf("[%s Mode(%d) %s]", R, int(arg.Mode), X)
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case PCRel:
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return fmt.Sprintf(".%+#x", int32(arg)+4)
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case Reg:
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switch inst.Op &^ 15 {
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case LDREX_EQ:
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if argIndex == 0 {
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return fmt.Sprintf("r%d", int32(arg))
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}
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}
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switch arg {
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case R10:
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return "sl"
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case R11:
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return "fp"
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case R12:
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return "ip"
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}
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case RegList:
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var buf bytes.Buffer
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fmt.Fprintf(&buf, "{")
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sep := ""
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for i := 0; i < 16; i++ {
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if arg&(1<<uint(i)) != 0 {
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fmt.Fprintf(&buf, "%s%s", sep, gnuArg(inst, -1, Reg(i)))
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sep = ", "
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}
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}
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fmt.Fprintf(&buf, "}")
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return buf.String()
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case RegShift:
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if arg.Shift == ShiftLeft && arg.Count == 0 {
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return gnuArg(inst, -1, arg.Reg)
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}
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if arg.Shift == RotateRightExt {
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return gnuArg(inst, -1, arg.Reg) + ", rrx"
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}
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return fmt.Sprintf("%s, %s #%d", gnuArg(inst, -1, arg.Reg), strings.ToLower(arg.Shift.String()), arg.Count)
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case RegShiftReg:
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return fmt.Sprintf("%s, %s %s", gnuArg(inst, -1, arg.Reg), strings.ToLower(arg.Shift.String()), gnuArg(inst, -1, arg.RegCount))
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}
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return strings.ToLower(arg.String())
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}
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