func NewUsercornRaw(l models.Loader, config *models.Config) (*Usercorn, error) {
config = config.Init()
a, OS, err := arch.GetArch(l.Arch(), l.OS())
if err != nil {
return nil, err
}
unicorn, err := NewUnicorn(a, OS, l.ByteOrder())
if err != nil {
return nil, err
}
u := &Usercorn{
Unicorn: unicorn,
traceMatching: true,
config: config,
loader: l,
exit: 0xffffffffffffffff,
}
if config.Output == os.Stderr && readline.IsTerminal(int(os.Stderr.Fd())) {
config.Color = true
}
u.memio = memio.NewMemIO(
// ReadAt() callback
func(p []byte, addr uint64) (int, error) {
if err := u.MemReadInto(p, addr); err != nil {
return 0, err
}
if u.config.TraceMemBatch {
u.memlog.UpdateBytes(addr, p, false)
}
return len(p), nil
},
// WriteAt() callback
func(p []byte, addr uint64) (int, error) {
if err := u.MemWrite(addr, p); err != nil {
return 0, err
}
if u.config.TraceMemBatch {
u.memlog.UpdateBytes(addr, p, true)
}
return len(p), nil
},
)
// load kernels
// the array cast is a trick to work around circular imports
if OS.Kernels != nil {
kernelI := OS.Kernels(u)
kernels := make([]co.Kernel, len(kernelI))
for i, k := range kernelI {
kernels[i] = k.(co.Kernel)
}
u.kernels = kernels
}
u.status = models.StatusDiff{U: u}
if u.config.LoopCollapse > 0 {
u.blockloop = models.NewLoopDetect(u.config.LoopCollapse)
}
// TODO: if we error, should close Usercorn/Unicorn instance?
// GC might take its time
if err := u.mapStack(); err != nil {
return nil, err
}
if err := u.addHooks(); err != nil {
return nil, err
}
return u, nil
}
func NewUsercorn(exe string, config *models.Config) (models.Usercorn, error) {
config = config.Init()
f, err := os.Open(exe)
if err != nil {
return nil, err
}
defer f.Close()
l, err := loader.Load(f)
if err == loader.UnknownMagic {
f.Seek(0, 0)
scanner := bufio.NewScanner(f)
if scanner.Scan() {
line := scanner.Text()
if strings.HasPrefix(line, "#!") && len(line) > 2 {
args := strings.Split(line[2:], " ")
prefix := append(args[1:], exe)
config.PrefixArgs = append(prefix, config.PrefixArgs...)
shell := config.PrefixPath(args[0], false)
return NewUsercorn(shell, config)
}
}
}
if err != nil {
return nil, err
}
u, err := NewUsercornRaw(l, config)
if err != nil {
return nil, err
}
exe, _ = filepath.Abs(exe)
u.exe = exe
u.loader = l
// map binary (and interp) into memory
u.interpBase, u.entry, u.base, u.binEntry, err = u.mapBinary(f, false, l.Arch())
if err != nil {
return nil, err
}
// find data segment for brk
u.brk = 0
segments, err := l.Segments()
if err != nil {
return nil, err
}
for _, seg := range segments {
if seg.Prot&uc.PROT_WRITE != 0 {
addr := u.base + seg.Addr + seg.Size
if addr > u.brk {
u.brk = addr
}
}
}
// TODO: have a "host page size", maybe arch.Align()
// TODO: allow setting brk addr for raw Usercorn?
mask := uint64(4096 - 1)
u.Brk((u.brk + mask) & ^mask)
// make sure PC is set to entry point for debuggers
u.RegWrite(u.Arch().PC, u.Entry())
return u, nil
}