func NewUsercornCmd() *UsercornCmd {
fs := flag.NewFlagSet("cli", flag.ExitOnError)
cmd := &UsercornCmd{Flags: fs}
cmd.MakeUsercorn = func(exe string) (models.Usercorn, error) {
// check permissions
if stat, err := os.Stat(exe); err != nil {
return nil, err
} else if stat.Mode().Perm()&0111 == 0 {
return nil, fmt.Errorf("%s: permission denied (no execute bit)\n", exe)
}
return usercorn.NewUsercorn(exe, cmd.Config)
}
return cmd
}
func main() {
runtime.LockOSThread()
defer runtime.UnlockOSThread()
fs := flag.NewFlagSet("cli", flag.ExitOnError)
verbose := fs.Bool("v", false, "verbose output")
trace := fs.Bool("trace", false, "recommended tracing options: -loop 8 -strace -mtrace2 -etrace -rtrace")
strace := fs.Bool("strace", false, "trace syscalls")
mtrace := fs.Bool("mtrace", false, "trace memory access (single)")
mtrace2 := fs.Bool("mtrace2", false, "trace memory access (batched)")
etrace := fs.Bool("etrace", false, "trace execution")
rtrace := fs.Bool("rtrace", false, "trace register modification")
match := fs.String("match", "", "trace from specific function(s) (func[,func...][+depth]")
looproll := fs.Int("loop", 0, "collapse loop blocks of this depth")
prefix := fs.String("prefix", "", "library load prefix")
base := fs.Uint64("base", 0, "force executable base address")
ibase := fs.Uint64("ibase", 0, "force interpreter base address")
demangle := fs.Bool("demangle", false, "demangle symbols using c++filt")
fs.Usage = func() {
fmt.Fprintf(os.Stderr, "Usage: %s [options] <exe> [args...]\n", os.Args[0])
fs.PrintDefaults()
}
fs.Parse(os.Args[1:])
args := fs.Args()
if len(args) < 1 {
fs.Usage()
os.Exit(1)
}
absPrefix := ""
var err error
if *prefix != "" {
absPrefix, err = filepath.Abs(*prefix)
if err != nil {
panic(err)
}
}
corn, err := usercorn.NewUsercorn(args[0], absPrefix)
if err != nil {
panic(err)
}
corn.Verbose = *verbose
corn.TraceSys = *strace || *trace
corn.TraceMem = *mtrace
corn.TraceMemBatch = *mtrace2 || *trace
corn.TraceReg = *rtrace || *trace
corn.TraceExec = *etrace || *trace
if *match != "" {
split := strings.SplitN(*match, "+", 2)
if len(split) > 1 {
if split[1] == "" {
corn.TraceMatchDepth = 999999
} else {
corn.TraceMatchDepth, _ = strconv.Atoi(split[1])
}
}
corn.TraceMatch = strings.Split(split[0], ",")
}
if *looproll == 0 && *trace {
*looproll = 8
}
corn.LoopCollapse = *looproll
corn.ForceBase = *base
corn.ForceInterpBase = *ibase
corn.Demangle = *demangle
err = corn.Run(args, os.Environ())
if err != nil {
if e, ok := err.(models.ExitStatus); ok {
os.Exit(int(e))
} else {
panic(err)
}
}
}