582 lines
16 KiB
OCaml
582 lines
16 KiB
OCaml
(**************************************************************************)
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(* *)
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(* OCaml *)
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(* *)
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(* Xavier Leroy, projet Cristal, INRIA Rocquencourt *)
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(* *)
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(* Copyright 1996 Institut National de Recherche en Informatique et *)
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(* en Automatique. *)
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(* *)
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(* All rights reserved. This file is distributed under the terms of *)
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(* the GNU Lesser General Public License version 2.1, with the *)
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(* special exception on linking described in the file LICENSE. *)
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(* *)
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(**************************************************************************)
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(* Disassembler for executable and .cmo object files *)
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open Asttypes
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open Config
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open Instruct
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open Lambda
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open Location
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open Opcodes
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open Opnames
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open Cmo_format
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open Printf
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let print_locations = ref true
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let print_reloc_info = ref false
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(* Read signed and unsigned integers *)
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let inputu ic =
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let b1 = input_byte ic in
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let b2 = input_byte ic in
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let b3 = input_byte ic in
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let b4 = input_byte ic in
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(b4 lsl 24) + (b3 lsl 16) + (b2 lsl 8) + b1
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let inputs ic =
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let b1 = input_byte ic in
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let b2 = input_byte ic in
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let b3 = input_byte ic in
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let b4 = input_byte ic in
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let b4' = if b4 >= 128 then b4-256 else b4 in
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(b4' lsl 24) + (b3 lsl 16) + (b2 lsl 8) + b1
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(* Global variables *)
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type global_table_entry =
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Empty
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| Global of Ident.t
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| Constant of Obj.t
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let start = ref 0 (* Position of beg. of code *)
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let reloc = ref ([] : (reloc_info * int) list) (* Relocation table *)
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let globals = ref ([||] : global_table_entry array) (* Global map *)
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let primitives = ref ([||] : string array) (* Table of primitives *)
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let objfile = ref false (* true if dumping a .cmo *)
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(* Events (indexed by PC) *)
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let event_table = (Hashtbl.create 253 : (int, debug_event) Hashtbl.t)
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let relocate_event orig ev =
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ev.ev_pos <- orig + ev.ev_pos;
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match ev.ev_repr with
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Event_parent repr -> repr := ev.ev_pos
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| _ -> ()
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let record_events orig evl =
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List.iter
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(fun ev ->
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relocate_event orig ev;
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Hashtbl.add event_table ev.ev_pos ev)
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evl
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(* Print a structured constant *)
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let print_float f =
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if String.contains f '.'
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then printf "%s" f
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else printf "%s." f
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;;
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let rec print_struct_const = function
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Const_base(Const_int i) -> printf "%d" i
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| Const_base(Const_float f) -> print_float f
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| Const_base(Const_string (s, _, _)) -> printf "%S" s
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| Const_immstring s -> printf "%S" s
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| Const_base(Const_char c) -> printf "%C" c
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| Const_base(Const_int32 i) -> printf "%ldl" i
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| Const_base(Const_nativeint i) -> printf "%ndn" i
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| Const_base(Const_int64 i) -> printf "%LdL" i
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| Const_block(tag, args) ->
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printf "<%d>" tag;
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begin match args with
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[] -> ()
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| [a1] ->
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printf "("; print_struct_const a1; printf ")"
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| a1::al ->
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printf "("; print_struct_const a1;
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List.iter (fun a -> printf ", "; print_struct_const a) al;
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printf ")"
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end
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| Const_float_array a ->
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printf "[|";
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List.iter (fun f -> print_float f; printf "; ") a;
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printf "|]"
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(* Print an obj *)
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let same_custom x y =
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Obj.field x 0 = Obj.field (Obj.repr y) 0
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let rec print_obj x =
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if Obj.is_block x then begin
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let tag = Obj.tag x in
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if tag = Obj.string_tag then
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printf "%S" (Obj.magic x : string)
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else if tag = Obj.double_tag then
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printf "%.12g" (Obj.magic x : float)
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else if tag = Obj.double_array_tag then begin
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let a = (Obj.magic x : floatarray) in
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printf "[|";
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for i = 0 to Array.Floatarray.length a - 1 do
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if i > 0 then printf ", ";
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printf "%.12g" (Array.Floatarray.get a i)
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done;
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printf "|]"
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end else if tag = Obj.custom_tag && same_custom x 0l then
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printf "%ldl" (Obj.magic x : int32)
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else if tag = Obj.custom_tag && same_custom x 0n then
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printf "%ndn" (Obj.magic x : nativeint)
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else if tag = Obj.custom_tag && same_custom x 0L then
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printf "%LdL" (Obj.magic x : int64)
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else if tag < Obj.no_scan_tag then begin
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printf "<%d>" (Obj.tag x);
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match Obj.size x with
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0 -> ()
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| 1 ->
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printf "("; print_obj (Obj.field x 0); printf ")"
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| n ->
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printf "("; print_obj (Obj.field x 0);
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for i = 1 to n - 1 do
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printf ", "; print_obj (Obj.field x i)
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done;
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printf ")"
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end else
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printf "<tag %d>" tag
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end else
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printf "%d" (Obj.magic x : int)
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(* Current position in input file *)
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let currpos ic =
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pos_in ic - !start
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(* Access in the relocation table *)
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let rec rassoc key = function
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[] -> raise Not_found
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| (a,b) :: l -> if b = key then a else rassoc key l
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let find_reloc ic =
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rassoc (pos_in ic - !start) !reloc
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(* Symbolic printing of global names, etc *)
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let print_getglobal_name ic =
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if !objfile then begin
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begin try
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match find_reloc ic with
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Reloc_getglobal id -> print_string (Ident.name id)
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| Reloc_literal sc -> print_struct_const sc
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| _ -> print_string "<wrong reloc>"
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with Not_found ->
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print_string "<no reloc>"
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end;
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ignore (inputu ic);
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end
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else begin
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let n = inputu ic in
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if n >= Array.length !globals || n < 0
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then print_string "<global table overflow>"
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else match !globals.(n) with
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Global id -> print_string(Ident.name id)
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| Constant obj -> print_obj obj
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| _ -> print_string "???"
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end
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let print_setglobal_name ic =
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if !objfile then begin
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begin try
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match find_reloc ic with
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Reloc_setglobal id -> print_string (Ident.name id)
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| _ -> print_string "<wrong reloc>"
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with Not_found ->
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print_string "<no reloc>"
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end;
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ignore (inputu ic);
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end
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else begin
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let n = inputu ic in
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if n >= Array.length !globals || n < 0
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then print_string "<global table overflow>"
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else match !globals.(n) with
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Global id -> print_string(Ident.name id)
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| _ -> print_string "???"
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end
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let print_primitive ic =
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if !objfile then begin
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begin try
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match find_reloc ic with
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Reloc_primitive s -> print_string s
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| _ -> print_string "<wrong reloc>"
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with Not_found ->
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print_string "<no reloc>"
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end;
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ignore (inputu ic);
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end
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else begin
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let n = inputu ic in
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if n >= Array.length !primitives || n < 0
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then print_int n
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else print_string !primitives.(n)
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end
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(* Disassemble one instruction *)
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let currpc ic =
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currpos ic / 4
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type shape =
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| Nothing
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| Uint
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| Sint
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| Uint_Uint
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| Disp
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| Uint_Disp
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| Sint_Disp
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| Getglobal
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| Getglobal_Uint
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| Setglobal
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| Primitive
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| Uint_Primitive
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| Switch
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| Closurerec
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| Pubmet
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;;
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let op_shapes = [
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opACC0, Nothing;
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opACC1, Nothing;
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opACC2, Nothing;
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opACC3, Nothing;
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opACC4, Nothing;
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opACC5, Nothing;
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opACC6, Nothing;
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opACC7, Nothing;
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opACC, Uint;
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opPUSH, Nothing;
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opPUSHACC0, Nothing;
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opPUSHACC1, Nothing;
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opPUSHACC2, Nothing;
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opPUSHACC3, Nothing;
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opPUSHACC4, Nothing;
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opPUSHACC5, Nothing;
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opPUSHACC6, Nothing;
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opPUSHACC7, Nothing;
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opPUSHACC, Uint;
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opPOP, Uint;
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opASSIGN, Uint;
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opENVACC1, Nothing;
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opENVACC2, Nothing;
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opENVACC3, Nothing;
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opENVACC4, Nothing;
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opENVACC, Uint;
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opPUSHENVACC1, Nothing;
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opPUSHENVACC2, Nothing;
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opPUSHENVACC3, Nothing;
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opPUSHENVACC4, Nothing;
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opPUSHENVACC, Uint;
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opPUSH_RETADDR, Disp;
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opAPPLY, Uint;
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opAPPLY1, Nothing;
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opAPPLY2, Nothing;
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opAPPLY3, Nothing;
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opAPPTERM, Uint_Uint;
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opAPPTERM1, Uint;
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opAPPTERM2, Uint;
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opAPPTERM3, Uint;
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opRETURN, Uint;
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opRESTART, Nothing;
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opGRAB, Uint;
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opCLOSURE, Uint_Disp;
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opCLOSUREREC, Closurerec;
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opOFFSETCLOSUREM2, Nothing;
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opOFFSETCLOSURE0, Nothing;
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opOFFSETCLOSURE2, Nothing;
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opOFFSETCLOSURE, Sint; (* was Uint *)
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opPUSHOFFSETCLOSUREM2, Nothing;
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opPUSHOFFSETCLOSURE0, Nothing;
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opPUSHOFFSETCLOSURE2, Nothing;
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opPUSHOFFSETCLOSURE, Sint; (* was Nothing *)
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opGETGLOBAL, Getglobal;
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opPUSHGETGLOBAL, Getglobal;
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opGETGLOBALFIELD, Getglobal_Uint;
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opPUSHGETGLOBALFIELD, Getglobal_Uint;
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opSETGLOBAL, Setglobal;
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opATOM0, Nothing;
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opATOM, Uint;
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opPUSHATOM0, Nothing;
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opPUSHATOM, Uint;
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opMAKEBLOCK, Uint_Uint;
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opMAKEBLOCK1, Uint;
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opMAKEBLOCK2, Uint;
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opMAKEBLOCK3, Uint;
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opMAKEFLOATBLOCK, Uint;
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opGETFIELD0, Nothing;
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opGETFIELD1, Nothing;
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opGETFIELD2, Nothing;
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opGETFIELD3, Nothing;
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opGETFIELD, Uint;
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opGETFLOATFIELD, Uint;
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opSETFIELD0, Nothing;
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opSETFIELD1, Nothing;
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opSETFIELD2, Nothing;
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opSETFIELD3, Nothing;
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opSETFIELD, Uint;
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opSETFLOATFIELD, Uint;
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opVECTLENGTH, Nothing;
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opGETVECTITEM, Nothing;
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opSETVECTITEM, Nothing;
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opGETSTRINGCHAR, Nothing;
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opGETBYTESCHAR, Nothing;
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opSETBYTESCHAR, Nothing;
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opBRANCH, Disp;
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opBRANCHIF, Disp;
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opBRANCHIFNOT, Disp;
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opSWITCH, Switch;
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opBOOLNOT, Nothing;
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opPUSHTRAP, Disp;
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opPOPTRAP, Nothing;
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opRAISE, Nothing;
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opCHECK_SIGNALS, Nothing;
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opC_CALL1, Primitive;
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opC_CALL2, Primitive;
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opC_CALL3, Primitive;
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opC_CALL4, Primitive;
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opC_CALL5, Primitive;
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opC_CALLN, Uint_Primitive;
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opCONST0, Nothing;
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opCONST1, Nothing;
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opCONST2, Nothing;
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opCONST3, Nothing;
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opCONSTINT, Sint;
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opPUSHCONST0, Nothing;
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opPUSHCONST1, Nothing;
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opPUSHCONST2, Nothing;
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opPUSHCONST3, Nothing;
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opPUSHCONSTINT, Sint;
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opNEGINT, Nothing;
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opADDINT, Nothing;
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opSUBINT, Nothing;
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opMULINT, Nothing;
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opDIVINT, Nothing;
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opMODINT, Nothing;
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opANDINT, Nothing;
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opORINT, Nothing;
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opXORINT, Nothing;
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opLSLINT, Nothing;
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opLSRINT, Nothing;
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opASRINT, Nothing;
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opEQ, Nothing;
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opNEQ, Nothing;
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opLTINT, Nothing;
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opLEINT, Nothing;
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opGTINT, Nothing;
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opGEINT, Nothing;
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opOFFSETINT, Sint;
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opOFFSETREF, Sint;
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opISINT, Nothing;
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opGETMETHOD, Nothing;
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opGETDYNMET, Nothing;
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opGETPUBMET, Pubmet;
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opBEQ, Sint_Disp;
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opBNEQ, Sint_Disp;
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opBLTINT, Sint_Disp;
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opBLEINT, Sint_Disp;
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opBGTINT, Sint_Disp;
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opBGEINT, Sint_Disp;
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opULTINT, Nothing;
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opUGEINT, Nothing;
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opBULTINT, Uint_Disp;
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opBUGEINT, Uint_Disp;
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opSTOP, Nothing;
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opEVENT, Nothing;
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opBREAK, Nothing;
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opRERAISE, Nothing;
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opRAISE_NOTRACE, Nothing;
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];;
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let print_event ev =
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if !print_locations then
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let ls = ev.ev_loc.loc_start in
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let le = ev.ev_loc.loc_end in
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printf "File \"%s\", line %d, characters %d-%d:\n" ls.Lexing.pos_fname
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ls.Lexing.pos_lnum (ls.Lexing.pos_cnum - ls.Lexing.pos_bol)
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(le.Lexing.pos_cnum - ls.Lexing.pos_bol)
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let print_instr ic =
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let pos = currpos ic in
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List.iter print_event (Hashtbl.find_all event_table pos);
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printf "%8d " (pos / 4);
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let op = inputu ic in
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if op >= Array.length names_of_instructions || op < 0
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then (print_string "*** unknown opcode : "; print_int op)
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else print_string names_of_instructions.(op);
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begin try
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let shape = List.assoc op op_shapes in
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if shape <> Nothing then print_string " ";
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match shape with
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| Uint -> print_int (inputu ic)
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| Sint -> print_int (inputs ic)
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| Uint_Uint
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-> print_int (inputu ic); print_string ", "; print_int (inputu ic)
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| Disp -> let p = currpc ic in print_int (p + inputs ic)
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| Uint_Disp
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-> print_int (inputu ic); print_string ", ";
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let p = currpc ic in print_int (p + inputs ic)
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| Sint_Disp
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-> print_int (inputs ic); print_string ", ";
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let p = currpc ic in print_int (p + inputs ic)
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| Getglobal -> print_getglobal_name ic
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| Getglobal_Uint
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-> print_getglobal_name ic; print_string ", "; print_int (inputu ic)
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| Setglobal -> print_setglobal_name ic
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| Primitive -> print_primitive ic
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| Uint_Primitive
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-> print_int(inputu ic); print_string ", "; print_primitive ic
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| Switch
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-> let n = inputu ic in
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let orig = currpc ic in
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for i = 0 to (n land 0xFFFF) - 1 do
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print_string "\n int "; print_int i; print_string " -> ";
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print_int(orig + inputs ic);
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done;
|
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for i = 0 to (n lsr 16) - 1 do
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print_string "\n tag "; print_int i; print_string " -> ";
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print_int(orig + inputs ic);
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done;
|
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| Closurerec
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-> let nfuncs = inputu ic in
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let nvars = inputu ic in
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let orig = currpc ic in
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print_int nvars;
|
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for _i = 0 to nfuncs - 1 do
|
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print_string ", ";
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print_int (orig + inputs ic);
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done;
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| Pubmet
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-> let tag = inputs ic in
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let _cache = inputu ic in
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print_int tag
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| Nothing -> ()
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with Not_found -> print_string " (unknown arguments)"
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end;
|
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print_string "\n";
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;;
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|
|
(* Disassemble a block of code *)
|
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|
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let print_code ic len =
|
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start := pos_in ic;
|
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let stop = !start + len in
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while pos_in ic < stop do print_instr ic done
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|
|
(* Dump relocation info *)
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|
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let print_reloc (info, pos) =
|
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printf " %d (%d) " pos (pos/4);
|
|
match info with
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Reloc_literal sc -> print_struct_const sc; printf "\n"
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| Reloc_getglobal id -> printf "require %s\n" (Ident.name id)
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| Reloc_setglobal id -> printf "provide %s\n" (Ident.name id)
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| Reloc_primitive s -> printf "prim %s\n" s
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|
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(* Print a .cmo file *)
|
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|
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let dump_obj ic =
|
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let buffer = really_input_string ic (String.length cmo_magic_number) in
|
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if buffer <> cmo_magic_number then begin
|
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prerr_endline "Not an object file"; exit 2
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end;
|
|
let cu_pos = input_binary_int ic in
|
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seek_in ic cu_pos;
|
|
let cu = (input_value ic : compilation_unit) in
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reloc := cu.cu_reloc;
|
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if !print_reloc_info then
|
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List.iter print_reloc cu.cu_reloc;
|
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if cu.cu_debug > 0 then begin
|
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seek_in ic cu.cu_debug;
|
|
let evl = (input_value ic : debug_event list) in
|
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ignore (input_value ic); (* Skip the list of absolute directory names *)
|
|
record_events 0 evl
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end;
|
|
seek_in ic cu.cu_pos;
|
|
print_code ic cu.cu_codesize
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|
|
(* Read the primitive table from an executable *)
|
|
|
|
let read_primitive_table ic len =
|
|
let p = really_input_string ic len in
|
|
String.split_on_char '\000' p |> List.filter ((<>) "") |> Array.of_list
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|
|
|
(* Print an executable file *)
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let dump_exe ic =
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Bytesections.read_toc ic;
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let prim_size = Bytesections.seek_section ic "PRIM" in
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primitives := read_primitive_table ic prim_size;
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ignore(Bytesections.seek_section ic "DATA");
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let init_data = (input_value ic : Obj.t array) in
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globals := Array.make (Array.length init_data) Empty;
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for i = 0 to Array.length init_data - 1 do
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!globals.(i) <- Constant (init_data.(i))
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done;
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ignore(Bytesections.seek_section ic "SYMB");
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let sym_table = (input_value ic : Symtable.global_map) in
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Symtable.iter_global_map
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(fun id pos -> !globals.(pos) <- Global id) sym_table;
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begin try
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ignore (Bytesections.seek_section ic "DBUG");
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let num_eventlists = input_binary_int ic in
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for _i = 1 to num_eventlists do
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let orig = input_binary_int ic in
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let evl = (input_value ic : debug_event list) in
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ignore (input_value ic); (* Skip the list of absolute directory names *)
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record_events orig evl
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done
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with Not_found -> ()
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end;
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let code_size = Bytesections.seek_section ic "CODE" in
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print_code ic code_size
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let arg_list = [
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"-noloc", Arg.Clear print_locations, " : don't print source information";
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"-reloc", Arg.Set print_reloc_info, " : print relocation information";
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"-args", Arg.Expand Arg.read_arg,
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"<file> Read additional newline separated command line arguments \n\
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\ from <file>";
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"-args0", Arg.Expand Arg.read_arg0,
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"<file> Read additional NUL separated command line arguments from \n\
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\ <file>";
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]
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let arg_usage =
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Printf.sprintf "%s [OPTIONS] FILES : dump content of bytecode files"
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Sys.argv.(0)
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let first_file = ref true
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let arg_fun filename =
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let ic = open_in_bin filename in
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if not !first_file then print_newline ();
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first_file := false;
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printf "## start of ocaml dump of %S\n%!" filename;
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begin try
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objfile := false; dump_exe ic
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with Bytesections.Bad_magic_number ->
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objfile := true; seek_in ic 0; dump_obj ic
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end;
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close_in ic;
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printf "## end of ocaml dump of %S\n%!" filename
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let main() =
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Arg.parse_expand arg_list arg_fun arg_usage;
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exit 0
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let _ = main ()
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