35d4f05c4e
Moves the implementation of Registers.Get out of the backends and into proc where it can be implemented only once per architecture.
132 lines
3.5 KiB
Go
132 lines
3.5 KiB
Go
// TODO: disassembler support should be compiled in unconditionally,
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// instead of being decided by the build-target architecture, and be
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// part of the Arch object instead.
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package proc
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import (
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"github.com/go-delve/delve/pkg/dwarf/op"
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"github.com/go-delve/delve/pkg/dwarf/regnum"
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"golang.org/x/arch/arm64/arm64asm"
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)
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func arm64AsmDecode(asmInst *AsmInstruction, mem []byte, regs *op.DwarfRegisters, memrw MemoryReadWriter, bi *BinaryInfo) error {
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asmInst.Size = 4
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asmInst.Bytes = mem[:asmInst.Size]
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inst, err := arm64asm.Decode(mem)
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if err != nil {
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asmInst.Inst = (*arm64ArchInst)(nil)
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return err
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}
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asmInst.Inst = (*arm64ArchInst)(&inst)
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asmInst.Kind = OtherInstruction
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switch inst.Op {
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case arm64asm.BL, arm64asm.BLR:
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asmInst.Kind = CallInstruction
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case arm64asm.RET, arm64asm.ERET:
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asmInst.Kind = RetInstruction
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case arm64asm.B, arm64asm.BR:
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asmInst.Kind = JmpInstruction
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case arm64asm.BRK:
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asmInst.Kind = HardBreakInstruction
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}
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asmInst.DestLoc = resolveCallArgARM64(&inst, asmInst.Loc.PC, asmInst.AtPC, regs, memrw, bi)
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return nil
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}
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func resolveCallArgARM64(inst *arm64asm.Inst, instAddr uint64, currentGoroutine bool, regs *op.DwarfRegisters, mem MemoryReadWriter, bininfo *BinaryInfo) *Location {
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switch inst.Op {
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case arm64asm.BL, arm64asm.BLR, arm64asm.B, arm64asm.BR:
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//ok
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default:
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return nil
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}
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var pc uint64
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var err error
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switch arg := inst.Args[0].(type) {
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case arm64asm.Imm:
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pc = uint64(arg.Imm)
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case arm64asm.Reg:
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if !currentGoroutine || regs == nil {
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return nil
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}
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pc, err = bininfo.Arch.getAsmRegister(regs, int(arg))
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if err != nil {
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return nil
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}
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case arm64asm.PCRel:
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pc = uint64(instAddr) + uint64(arg)
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default:
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return nil
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}
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file, line, fn := bininfo.PCToLine(pc)
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if fn == nil {
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return &Location{PC: pc}
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}
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return &Location{PC: pc, File: file, Line: line, Fn: fn}
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}
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// Possible stacksplit prologues are inserted by stacksplit in
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// $GOROOT/src/cmd/internal/obj/arm64/obj7.go.
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var prologuesARM64 []opcodeSeq
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func init() {
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var tinyStacksplit = opcodeSeq{uint64(arm64asm.MOV), uint64(arm64asm.CMP), uint64(arm64asm.B)}
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var smallStacksplit = opcodeSeq{uint64(arm64asm.SUB), uint64(arm64asm.CMP), uint64(arm64asm.B)}
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var bigStacksplit = opcodeSeq{uint64(arm64asm.CMP), uint64(arm64asm.B), uint64(arm64asm.ADD), uint64(arm64asm.SUB), uint64(arm64asm.MOV), uint64(arm64asm.CMP), uint64(arm64asm.B)}
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var unixGetG = opcodeSeq{uint64(arm64asm.LDR)}
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prologuesARM64 = make([]opcodeSeq, 0, 3)
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for _, getG := range []opcodeSeq{unixGetG} {
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for _, stacksplit := range []opcodeSeq{tinyStacksplit, smallStacksplit, bigStacksplit} {
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prologue := make(opcodeSeq, 0, len(getG)+len(stacksplit))
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prologue = append(prologue, getG...)
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prologue = append(prologue, stacksplit...)
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prologuesARM64 = append(prologuesARM64, prologue)
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}
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}
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}
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type arm64ArchInst arm64asm.Inst
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func (inst *arm64ArchInst) Text(flavour AssemblyFlavour, pc uint64, symLookup func(uint64) (string, uint64)) string {
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if inst == nil {
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return "?"
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}
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var text string
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switch flavour {
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case GNUFlavour:
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text = arm64asm.GNUSyntax(arm64asm.Inst(*inst))
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default:
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text = arm64asm.GoSyntax(arm64asm.Inst(*inst), pc, symLookup, nil)
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}
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return text
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}
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func (inst *arm64ArchInst) OpcodeEquals(op uint64) bool {
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if inst == nil {
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return false
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}
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return uint64(inst.Op) == op
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}
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var arm64AsmRegisters = func() map[int]asmRegister {
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r := make(map[int]asmRegister)
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for i := arm64asm.X0; i <= arm64asm.X30; i++ {
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r[int(i)] = asmRegister{regnum.ARM64_X0 + uint64(i-arm64asm.X0), 0, 0}
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}
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return r
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}()
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