idc.py

   1 # ScratchABit - interactive disassembler
   2 #
   3 # Copyright (c) 2015 Paul Sokolovsky
   4 #
   5 # This program is free software; you can redistribute it and/or modify
   6 # it under the terms of the GNU General Public License as published by
   7 # the Free Software Foundation, either version 3 of the License, or
   8 # (at your option) any later version.
   9 #
  10 # This program is distributed in the hope that it will be useful, but
  11 # WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 # General Public License for more details.
  14 #
  15 # You should have received a copy of the GNU General Public License
  16 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 import logging as log
  18
  19 from scratchabit import engine
  20 import idaapi
  21
  22
  23 SEGATTR_PERM = 1
  24
  25
  26 def GetReg(ea, reg):
  27     assert reg == "T"
  28     if engine.ADDRESS_SPACE.get_flags(ea, engine.AddressSpace.ALT_CODE):
  29         return 1
  30     return 0
  31
  32
  33 def GetSegmentAttr(ea, attr):
  34     assert attr == SEGATTR_PERM
  35     off, area = engine.ADDRESS_SPACE.addr2area(addr)
  36     props = engine.area_props(area)
  37     ret = 0
  38     if "R" in props:
  39         ret |= idaapi.SEGPERM_READ
  40     if "W" in props:
  41         ret |= idaapi.SEGPERM_WRITE
  42     if "X" in props:
  43         ret |= idaapi.SEGPERM_EXEC
  44
  45
  46 # Make filler
  47 def MakeAlign(ea, cnt, align):
  48     engine.ADDRESS_SPACE.make_filler(ea, cnt)
  49
  50
  51 def SetReg(ea, reg, val):
  52     assert reg == "T"
  53     try:
  54         if val:
  55             engine.ADDRESS_SPACE.update_flags(ea, 0xff, engine.AddressSpace.ALT_CODE)
  56         else:
  57             engine.ADDRESS_SPACE.update_flags(ea, ~engine.AddressSpace.ALT_CODE, 0)
  58     except engine.InvalidAddrException:
  59         log.exception("")
  60
  61
  62 def SetRegEx(ea, reg, val, tag):
  63     SetReg(ea, reg, val)
  64
  65     # tag == 2 seems to be set in IDC exports. Abuse that to have
  66     # more code entrypoints.
  67     if tag == 2:
  68         engine.add_entrypoint(ea, False)
  69
  70
  71 def MakeComm(ea, comment):
  72     engine.ADDRESS_SPACE.set_comment(ea, comment)
  73
  74
  75 def MakeFunction(ea, end=idaapi.BADADDR):
  76     # Exported *.idc have 0xffffffff as apparent BADADDR
  77     if end == 0xffffffff:
  78         end = idaapi.BADADDR
  79     engine.add_entrypoint(ea, True)
  80     if end != idaapi.BADADDR:
  81         # TODO: Actually handle function bounds ea-end
  82         assert False
  83
  84
  85 def MakeNameEx(ea, name, flags):
  86     # TODO: use the flags
  87     # TODO: name "" deletes label
  88     engine.ADDRESS_SPACE.set_label(ea, name)