84 lines
2.1 KiB
Go
84 lines
2.1 KiB
Go
package proc
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import "encoding/binary"
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// Takes an offset from RSP and returns the address of the
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// instruction the current function is going to return to.
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func (thread *Thread) ReturnAddress() (uint64, error) {
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locations, err := thread.Stacktrace(2)
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if err != nil {
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return 0, err
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}
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return locations[1].PC, nil
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}
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// Returns the stack trace for thread.
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// Note the locations in the array are return addresses not call addresses.
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func (thread *Thread) Stacktrace(depth int) ([]Location, error) {
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regs, err := thread.Registers()
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if err != nil {
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return nil, err
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}
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return thread.dbp.stacktrace(regs.PC(), regs.SP(), depth)
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}
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// Returns the stack trace for a goroutine.
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// Note the locations in the array are return addresses not call addresses.
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func (dbp *Process) GoroutineStacktrace(g *G, depth int) ([]Location, error) {
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if g.thread != nil {
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return g.thread.Stacktrace(depth)
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}
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locs, err := dbp.stacktrace(g.PC, g.SP, depth)
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return locs, err
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}
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func (dbp *Process) GoroutineLocation(g *G) *Location {
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f, l, fn := dbp.PCToLine(g.PC)
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return &Location{PC: g.PC, File: f, Line: l, Fn: fn}
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}
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type NullAddrError struct{}
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func (n NullAddrError) Error() string {
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return "NULL address"
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}
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func (dbp *Process) stacktrace(pc, sp uint64, depth int) ([]Location, error) {
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var (
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ret = pc
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btoffset int64
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locations []Location
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retaddr uintptr
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)
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f, l, fn := dbp.PCToLine(pc)
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locations = append(locations, Location{PC: pc, File: f, Line: l, Fn: fn})
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for i := 0; i < depth; i++ {
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fde, err := dbp.frameEntries.FDEForPC(ret)
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if err != nil {
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return nil, err
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}
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btoffset += fde.ReturnAddressOffset(ret)
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retaddr = uintptr(int64(sp) + btoffset + int64(i*dbp.arch.PtrSize()))
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if retaddr == 0 {
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return nil, NullAddrError{}
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}
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data, err := dbp.CurrentThread.readMemory(retaddr, dbp.arch.PtrSize())
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if err != nil {
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return nil, err
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}
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ret = binary.LittleEndian.Uint64(data)
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if ret <= 0 {
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break
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}
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f, l, fn = dbp.goSymTable.PCToLine(ret)
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if fn == nil {
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break
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}
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locations = append(locations, Location{PC: ret, File: f, Line: l, Fn: fn})
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if fn.Name == "runtime.goexit" {
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break
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}
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}
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return locations, nil
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}
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