def _recursiveProcessExportTrieNode(f, start, cur, end, prefix, symbols): if cur < end: f.seek(cur) termSize = f.read_byte() if termSize: sym = prefix readULeb128(f) addr = readULeb128(f) symbols.append(Symbol(sym, addr, SYMTYPE_GENERIC, extern=True)) f.seek(cur + termSize + 1) childCount = f.read_byte() for i in range(childCount): suffix = readString(f) offset = readULeb128(f) lastPos = f.tell() _recursiveProcessExportTrieNode(f, start, start + offset, end, prefix + suffix, symbols) f.seek(lastPos)
def _recursiveProcessExportTrieNode(f, start, cur, end, prefix, symbols,
macho):
if cur < end:
f.seek(cur)
termSize = f.read_byte()
if termSize:
sym = prefix
readULeb128(f)
file_addr = readULeb128(f)
vm_addr = macho.mappings.toVM(file_addr)
symbols.append(Symbol(sym, vm_addr, SYMTYPE_GENERIC, extern=True))
f.seek(cur + termSize + 1)
childCount = f.read_byte()
for i in range(childCount):
suffix = readString(f)
offset = readULeb128(f)
lastPos = f.tell()
_recursiveProcessExportTrieNode(f, start, start + offset, end,
prefix + suffix, symbols, macho)
f.seek(lastPos)
def _stringReader(file, curAddr, final): while curAddr < final: (string, length) = readString(file, returnLength=True) if length: yield Symbol(string, curAddr, SYMTYPE_CSTRING) curAddr += length+1
def _bind(machO, size, symbols):
libord = 0
sym = None
addr = 0
f = machO.file
end = f.tell() + size
lcs_all = machO.loadCommands.all
ptrwidth = machO.pointerWidth
allSegs = lcs_all('className', 'SegmentCommand')
while f.tell() < end:
c = f.read_byte()
imm = c & 0xf # BIND_IMMEDIATE_MASK
opcode = c & 0xf0 # BIND_OPCODE_MASK
if opcode == 0: # BIND_OPCODE_DONE
pass
elif opcode == 0x10: # BIND_OPCODE_SET_DYLIB_ORDINAL_IMM
libord = imm
elif opcode == 0x20: # BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB
libord = readULeb128(f)
elif opcode == 0x30: # BIND_OPCODE_SET_DYLIB_SPECIAL_IMM
libord = (imm | 0xf0) if imm else 0
elif opcode == 0x40: # BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM
sym = readString(f)
elif opcode == 0x50: # BIND_OPCODE_SET_TYPE_IMM
pass
elif opcode == 0x60: # BIND_OPCODE_SET_ADDEND_SLEB
readSLeb128(f)
elif opcode == 0x70: # BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB
addr = allSegs[imm].vmaddr + readULeb128(f)
elif opcode == 0x80: # BIND_OPCODE_ADD_ADDR_ULEB
addr += readULeb128(f)
elif opcode == 0x90: # BIND_OPCODE_DO_BIND
symbols.append(Symbol(sym, addr, SYMTYPE_UNDEFINED, libord=libord))
addr += ptrwidth
elif opcode == 0xa0: # BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB
symbols.append(Symbol(sym, addr, SYMTYPE_UNDEFINED, libord=libord))
addr += ptrwidth + readULeb128(f)
elif opcode == 0xb0: # BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED
symbols.append(Symbol(sym, addr, SYMTYPE_UNDEFINED, libord=libord))
addr += (imm+1) * ptrwidth
elif opcode == 0xc0: # BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB
count = readULeb128(f)
skip = readULeb128(f)
for i in range(count):
symbols.append(Symbol(sym, addr, SYMTYPE_UNDEFINED, libord=libord))
addr += skip + ptrwidth
def _bind(machO, size, symbols):
libord = 0
sym = None
addr = 0
f = machO.file
end = f.tell() + size
lcs_all = machO.loadCommands.all
ptrwidth = machO.pointerWidth
allSegs = lcs_all('className', 'SegmentCommand')
while f.tell() < end:
c = f.read_byte()
imm = c & 0xf # BIND_IMMEDIATE_MASK
opcode = c & 0xf0 # BIND_OPCODE_MASK
addr = addr & (0xffffffffffffffff if machO.is64bit else 0xffffffff
) # FIXME: how about 64-bit?
if opcode == 0: # BIND_OPCODE_DONE
pass
elif opcode == 0x10: # BIND_OPCODE_SET_DYLIB_ORDINAL_IMM
libord = imm
elif opcode == 0x20: # BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB
libord = readULeb128(f)
elif opcode == 0x30: # BIND_OPCODE_SET_DYLIB_SPECIAL_IMM
libord = (imm | 0xf0) if imm else 0
elif opcode == 0x40: # BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM
sym = readString(f)
elif opcode == 0x50: # BIND_OPCODE_SET_TYPE_IMM
pass
elif opcode == 0x60: # BIND_OPCODE_SET_ADDEND_SLEB
readSLeb128(f)
elif opcode == 0x70: # BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB
addr = allSegs[imm].vmaddr + readULeb128(f)
elif opcode == 0x80: # BIND_OPCODE_ADD_ADDR_ULEB
addr += readULeb128(f)
elif opcode == 0x90: # BIND_OPCODE_DO_BIND
symbols.append(Symbol(sym, addr, SYMTYPE_UNDEFINED, libord=libord))
addr += ptrwidth
elif opcode == 0xa0: # BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB
symbols.append(Symbol(sym, addr, SYMTYPE_UNDEFINED, libord=libord))
addr += ptrwidth + readULeb128(f)
elif opcode == 0xb0: # BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED
symbols.append(Symbol(sym, addr, SYMTYPE_UNDEFINED, libord=libord))
addr += (imm + 1) * ptrwidth
elif opcode == 0xc0: # BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB
count = readULeb128(f)
skip = readULeb128(f)
for i in range(count):
symbols.append(
Symbol(sym, addr, SYMTYPE_UNDEFINED, libord=libord))
addr += skip + ptrwidth
def _stringReader(file, curAddr, final):
while curAddr < final:
(string, length) = readString(file, returnLength=True)
if length:
yield Symbol(string, curAddr, SYMTYPE_CSTRING)
curAddr += length + 1
