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Issue501 stack variable recovery (#508)

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* Fix the unsigned to signed conversion for the frame offset;

* Use struct pack for the sign conversion
This commit is contained in:
kumarak
2019-01-17 15:43:04 -05:00
committed by Peter Goodman
parent 9786dffebc
commit af64f7c99e
1 changed files with 8 additions and 7 deletions
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tools/mcsema_disass/ida7/collect_variable.py
+8 -7
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@@ -308,16 +308,17 @@ class Instruction(object):
def mnemonic(self):
return self._insn.get_canon_mnem()
def _signed_from_unsigned64(val):
if val & 0x8000000000000000:
return -0x10000000000000000 + val
return val
return struct.unpack('q', struct.pack('Q', val & 0xFFFFFFFFFFFFFFFF))[0]
#if (val & 0x8000000000000000):
# return val - (1 << size)
#return val
def _signed_from_unsigned32(val):
if val & 0x80000000:
return -0x100000000 + val
return val
return struct.unpack('l', struct.pack('L', val & 0xFFFFFFFF))[0]
#if (val > 0) and (val & 0x80000000):
# return -0x100000000 + val
#return val
def _mark_function_args_ms64(referers, dereferences, func_var_data):
for reg in ["rcx", "rdx", "r8", "r9"]: