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122 lines
3.4 KiB
Go
122 lines
3.4 KiB
Go
package proc
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import "sort"
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// AsmInstruction represents one assembly instruction.
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type AsmInstruction struct {
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Loc Location
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DestLoc *Location
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Bytes []byte
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Breakpoint bool
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AtPC bool
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Inst *archInst
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}
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// AssemblyFlavour is the assembly syntax to display.
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type AssemblyFlavour int
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const (
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// GNUFlavour will display GNU assembly syntax.
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GNUFlavour = AssemblyFlavour(iota)
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// IntelFlavour will display Intel assembly syntax.
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IntelFlavour
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// GoFlavour will display Go assembly syntax.
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GoFlavour
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)
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// Disassemble disassembles target memory between startPC and endPC, marking
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// the current instruction being executed in goroutine g.
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// If currentGoroutine is set and thread is stopped at a CALL instruction Disassemble will evaluate the argument of the CALL instruction using the thread's registers
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// Be aware that the Bytes field of each returned instruction is a slice of a larger array of size endPC - startPC
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func Disassemble(dbp Process, g *G, startPC, endPC uint64) ([]AsmInstruction, error) {
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if _, err := dbp.Valid(); err != nil {
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return nil, err
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}
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if g == nil {
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ct := dbp.CurrentThread()
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regs, _ := ct.Registers(false)
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return disassemble(ct, regs, dbp.Breakpoints(), dbp.BinInfo(), startPC, endPC, false)
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}
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var regs Registers
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var mem MemoryReadWriter = dbp.CurrentThread()
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if g.Thread != nil {
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mem = g.Thread
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regs, _ = g.Thread.Registers(false)
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}
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return disassemble(mem, regs, dbp.Breakpoints(), dbp.BinInfo(), startPC, endPC, false)
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}
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func disassemble(memrw MemoryReadWriter, regs Registers, breakpoints *BreakpointMap, bi *BinaryInfo, startPC, endPC uint64, singleInstr bool) ([]AsmInstruction, error) {
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mem := make([]byte, int(endPC-startPC))
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_, err := memrw.ReadMemory(mem, uintptr(startPC))
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if err != nil {
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return nil, err
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}
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r := make([]AsmInstruction, 0, len(mem)/15)
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pc := startPC
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var curpc uint64
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if regs != nil {
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curpc = regs.PC()
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}
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for len(mem) > 0 {
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bp, atbp := breakpoints.M[pc]
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if atbp {
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for i := range bp.OriginalData {
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mem[i] = bp.OriginalData[i]
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}
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}
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file, line, fn := bi.PCToLine(pc)
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loc := Location{PC: pc, File: file, Line: line, Fn: fn}
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inst, err := asmDecode(mem, pc)
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if err == nil {
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atpc := (regs != nil) && (curpc == pc)
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destloc := resolveCallArg(inst, atpc, regs, memrw, bi)
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r = append(r, AsmInstruction{Loc: loc, DestLoc: destloc, Bytes: mem[:inst.Len], Breakpoint: atbp, AtPC: atpc, Inst: inst})
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pc += uint64(inst.Size())
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mem = mem[inst.Size():]
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} else {
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r = append(r, AsmInstruction{Loc: loc, Bytes: mem[:1], Breakpoint: atbp, Inst: nil})
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pc++
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mem = mem[1:]
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}
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if singleInstr {
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break
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}
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}
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return r, nil
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}
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// Looks up symbol (either functions or global variables) at address addr.
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// Used by disassembly formatter.
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func (bi *BinaryInfo) symLookup(addr uint64) (string, uint64) {
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fn := bi.PCToFunc(addr)
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if fn != nil {
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if fn.Entry == addr {
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// only report the function name if it's the exact address because it's
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// easier to read the absolute address than function_name+offset.
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return fn.Name, fn.Entry
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}
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return "", 0
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}
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i := sort.Search(len(bi.packageVars), func(i int) bool {
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return bi.packageVars[i].addr >= addr
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})
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if i >= len(bi.packageVars) {
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return "", 0
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}
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if bi.packageVars[i].addr > addr {
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// report previous variable + offset if i-th variable starts after addr
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i--
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}
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if i > 0 {
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return bi.packageVars[i].name, bi.packageVars[i].addr
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}
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return "", 0
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}
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