def getFunctionReturnAddress(self, pygdb, ptid, pid=None):
if pid is None:
_pid = pygdb.getPidFromTid(ptid)
else:
_pid = pid
sp = pygdb.getRegisterIndex(self.INDEX_SP, ptid)
tmp = pygdb.readMemory(sp, self.WORD_SIZE, pid=_pid)
return tools.byteStrToInt(tmp, tools.ENDIANESS.LITTLE)
def getPointerAt(self, pygdb, addr, pid):
"""
Gets the pointer at the given address.
@param pygdb: The PyGdb instance to use
@param addr: THe address of interest
@param pid: The pid of interest
"""
mem = pygdb.readMemory(addr, self.NATIVE_REGISTER_WIDTH >> 3, False, pid=pid)
if mem is None:
return None
return tools.byteStrToInt(mem, self.endianess)
def parseInstruction(ins):
"""
Interprets a given byte-string (4 bytes) as an instruction.
@param ins: The byte-string.
@return: A tupel of the for values describing the instruction.
"""
i = tools.byteStrToInt(ins, tools.ENDIANESS.BIG)
a = i >> (MIPS32.NATIVE_REGISTER_WIDTH - 6)
b = i >> (MIPS32.NATIVE_REGISTER_WIDTH - 6 - 5) & 0x1F
c = i >> (MIPS32.NATIVE_REGISTER_WIDTH - 6 - 5 - 5) & 0x1F
d = i & 0xFFFF
e = i & ((1 << (MIPS32.NATIVE_REGISTER_WIDTH - 6)) - 1) # lower 26 bits
return (a, b, c, d, e)
def getAuxiliaryVector(self, gdbSession):
rawAuxv = gdbSession.getRawAuxiliaryVector()
entrySize = gdbSession.cpu.getNativeRegisterWidth()/8
if gdbSession.cpu.islittleEndian():
endianess = tools.ENDIANESS.LITTLE
else:
endianess = tools.ENDIANESS.BIG
auxv = {}
isIndex = True
for i in range(len(rawAuxv))[::entrySize]:
chunk = rawAuxv[i:i+entrySize]
tmp = tools.byteStrToInt(chunk, endianess)
if isIndex:
index = tmp
else:
auxv[index] = tmp
isIndex = not isIndex
return auxv
def _GET_JMP_OFFSET(opnd):
opndSize = len(opnd)
v = tools.byteStrToInt(opnd, tools.ENDIANESS.LITTLE)
mask = 1 << ((opndSize*8)-1)
offset = (v^mask) - mask
return offset
