Source Code for Module envi.archs.arm.disasm

 1  #import sys 
 2  #import struct 
 3  #import traceback 
 4   
 5  import envi 
 6  #import envi.bits as e_bits 
 7  #from envi.bits import binary 
 8   
 9  from envi.archs.arm.const import * 
10  from envi.archs.arm.armdisasm import ArmStdDisasm 
11  from envi.archs.arm.thumbdisasm import ArmThumbDisasm 
12  from envi.archs.arm.regs import * 
13   
14  # Universal opcode things: 
15  # len 
16  # mode 
17   
18  #FIXME: TODO 
19  # FIXME ldm sp, { pc } seems to not get marked NOFALL 
20  # FIXME ldm sp, { pc } should probably be marked IF_RET too... 
21  # FIXME b lr / bx lr should be marked IF_RET as well! 
22  # FIXME encoding for swi instruction ( <4 cond> 1111 <24 bytes immediate> ) is totally horked (it's in p_uncond) 
23  # FIXME some arm opcode values are ENC << and some are ENC and some are etc.. 
24  #       (make all be ENC_FOO << 16 + <their index> 
25   
26  # FIXME the following things dont decode correctly 
27  # 5346544e    cmppl   r6, #1308622848 
28   
29  # 
30  # Possible future extensions:  
31  #   * VectorPointFloat subsystem (coproc 10+11) 
32  #   * Debug subsystem (coproc 14) 
33  #   * other 'default' coprocs we can handle and add value? 
34   
35   
36  #################################################################### 
37  # Parsers for the multiply family of instruction encodings 
38   
39 -class ArmDisasm: 
40   
41 -    def __init__(self): 
42          self.jzl_enabled = False 
43          self._dis_regctx = ArmRegisterContext() 
44          self._disasm = None 
45          self._disasms = ( 
46              ArmStdDisasm(), 
47              ArmThumbDisasm(), 
48              ArmJazDisasm(), 
49          ) 
50          self.loclookup = {} 
51           
52          self.setMode(MODE_ARM) 
53           
54 -    def setMode(self, mode_num): 
55          self._disasm = self._disasms[mode_num] 
56       
57 -    def disasm(self, bytes, offset, va, trackMode=True, mode=None): 
58   
59          # hack to make sure parsing odd addresses kicks to thumb 
60          if va & 1 == 1: 
61              self.setMode( MODE_THUMB ) 
62          else: 
63              self.setMode( MODE_ARM ) 
64   
65          op = self._disasm.disasm(bytes, offset, va, trackMode) 
66          return op 
67           
68 -class ArmJazDisasm: 
69 -    def disasm(self, bytes, offset, va, trackMode=True): 
70          raise Exception('Jaz Not Supported Yet!') 
71