| try: |
| import unittest2 as unittest |
| except ImportError: |
| import unittest |
| import sys |
| |
| sys.path.extend(['.', '..']) |
| from elftools.common.py3compat import BytesIO |
| from elftools.dwarf.callframe import ( |
| CallFrameInfo, CIE, FDE, instruction_name, CallFrameInstruction, |
| RegisterRule) |
| from elftools.dwarf.structs import DWARFStructs |
| from elftools.dwarf.descriptions import (describe_CFI_instructions, |
| set_global_machine_arch) |
| |
| |
| class TestCallFrame(unittest.TestCase): |
| def assertInstruction(self, instr, name, args): |
| self.assertIsInstance(instr, CallFrameInstruction) |
| self.assertEqual(instruction_name(instr.opcode), name) |
| self.assertEqual(instr.args, args) |
| |
| def test_spec_sample_d6(self): |
| # D.6 sample in DWARFv3 |
| s = BytesIO() |
| data = (b'' + |
| # first comes the CIE |
| b'\x20\x00\x00\x00' + # length |
| b'\xff\xff\xff\xff' + # CIE_id |
| b'\x03\x00\x04\x7c' + # version, augmentation, caf, daf |
| b'\x08' + # return address |
| b'\x0c\x07\x00' + |
| b'\x08\x00' + |
| b'\x07\x01' + |
| b'\x07\x02' + |
| b'\x07\x03' + |
| b'\x08\x04' + |
| b'\x08\x05' + |
| b'\x08\x06' + |
| b'\x08\x07' + |
| b'\x09\x08\x01' + |
| b'\x00' + |
| |
| # then comes the FDE |
| b'\x28\x00\x00\x00' + # length |
| b'\x00\x00\x00\x00' + # CIE_pointer (to CIE at 0) |
| b'\x44\x33\x22\x11' + # initial_location |
| b'\x54\x00\x00\x00' + # address range |
| b'\x41' + |
| b'\x0e\x0c' + b'\x41' + |
| b'\x88\x01' + b'\x41' + |
| b'\x86\x02' + b'\x41' + |
| b'\x0d\x06' + b'\x41' + |
| b'\x84\x03' + b'\x4b' + |
| b'\xc4' + b'\x41' + |
| b'\xc6' + |
| b'\x0d\x07' + b'\x41' + |
| b'\xc8' + b'\x41' + |
| b'\x0e\x00' + |
| b'\x00\x00' |
| ) |
| s.write(data) |
| |
| structs = DWARFStructs(little_endian=True, dwarf_format=32, address_size=4) |
| cfi = CallFrameInfo(s, len(data), structs) |
| entries = cfi.get_entries() |
| |
| self.assertEqual(len(entries), 2) |
| self.assertIsInstance(entries[0], CIE) |
| self.assertEqual(entries[0]['length'], 32) |
| self.assertEqual(entries[0]['data_alignment_factor'], -4) |
| self.assertEqual(entries[0]['return_address_register'], 8) |
| self.assertEqual(len(entries[0].instructions), 11) |
| self.assertInstruction(entries[0].instructions[0], |
| 'DW_CFA_def_cfa', [7, 0]) |
| self.assertInstruction(entries[0].instructions[8], |
| 'DW_CFA_same_value', [7]) |
| self.assertInstruction(entries[0].instructions[9], |
| 'DW_CFA_register', [8, 1]) |
| |
| self.assertTrue(isinstance(entries[1], FDE)) |
| self.assertEqual(entries[1]['length'], 40) |
| self.assertEqual(entries[1]['CIE_pointer'], 0) |
| self.assertEqual(entries[1]['address_range'], 84) |
| self.assertIs(entries[1].cie, entries[0]) |
| self.assertEqual(len(entries[1].instructions), 21) |
| self.assertInstruction(entries[1].instructions[0], |
| 'DW_CFA_advance_loc', [1]) |
| self.assertInstruction(entries[1].instructions[1], |
| 'DW_CFA_def_cfa_offset', [12]) |
| self.assertInstruction(entries[1].instructions[9], |
| 'DW_CFA_offset', [4, 3]) |
| self.assertInstruction(entries[1].instructions[18], |
| 'DW_CFA_def_cfa_offset', [0]) |
| self.assertInstruction(entries[1].instructions[20], |
| 'DW_CFA_nop', []) |
| |
| # Now let's decode it... |
| decoded_CIE = entries[0].get_decoded() |
| self.assertEqual(decoded_CIE.reg_order, list(range(9))) |
| self.assertEqual(len(decoded_CIE.table), 1) |
| self.assertEqual(decoded_CIE.table[0]['cfa'].reg, 7) |
| self.assertEqual(decoded_CIE.table[0]['pc'], 0) |
| self.assertEqual(decoded_CIE.table[0]['cfa'].offset, 0) |
| self.assertEqual(decoded_CIE.table[0][4].type, RegisterRule.SAME_VALUE) |
| self.assertEqual(decoded_CIE.table[0][8].type, RegisterRule.REGISTER) |
| self.assertEqual(decoded_CIE.table[0][8].arg, 1) |
| |
| decoded_FDE = entries[1].get_decoded() |
| self.assertEqual(decoded_FDE.reg_order, list(range(9))) |
| self.assertEqual(decoded_FDE.table[0]['cfa'].reg, 7) |
| self.assertEqual(decoded_FDE.table[0]['cfa'].offset, 0) |
| self.assertEqual(decoded_FDE.table[0]['pc'], 0x11223344) |
| self.assertEqual(decoded_FDE.table[0][8].type, RegisterRule.REGISTER) |
| self.assertEqual(decoded_FDE.table[0][8].arg, 1) |
| self.assertEqual(decoded_FDE.table[1]['cfa'].reg, 7) |
| self.assertEqual(decoded_FDE.table[1]['cfa'].offset, 12) |
| self.assertEqual(decoded_FDE.table[2][8].type, RegisterRule.OFFSET) |
| self.assertEqual(decoded_FDE.table[2][8].arg, -4) |
| self.assertEqual(decoded_FDE.table[2][4].type, RegisterRule.SAME_VALUE) |
| self.assertEqual(decoded_FDE.table[5]['pc'], 0x11223344 + 20) |
| self.assertEqual(decoded_FDE.table[5][4].type, RegisterRule.OFFSET) |
| self.assertEqual(decoded_FDE.table[5][4].arg, -12) |
| self.assertEqual(decoded_FDE.table[6]['pc'], 0x11223344 + 64) |
| self.assertEqual(decoded_FDE.table[9]['pc'], 0x11223344 + 76) |
| |
| def test_describe_CFI_instructions(self): |
| # The data here represents a single CIE |
| data = (b'' + |
| b'\x16\x00\x00\x00' + # length |
| b'\xff\xff\xff\xff' + # CIE_id |
| b'\x03\x00\x04\x7c' + # version, augmentation, caf, daf |
| b'\x08' + # return address |
| b'\x0c\x07\x02' + |
| b'\x10\x02\x07\x03\x01\x02\x00\x00\x06\x06') |
| s = BytesIO(data) |
| |
| structs = DWARFStructs(little_endian=True, dwarf_format=32, address_size=4) |
| cfi = CallFrameInfo(s, len(data), structs) |
| entries = cfi.get_entries() |
| |
| set_global_machine_arch('x86') |
| self.assertEqual(describe_CFI_instructions(entries[0]), |
| ( ' DW_CFA_def_cfa: r7 (edi) ofs 2\n' + |
| ' DW_CFA_expression: r2 (edx) (DW_OP_addr: 201; DW_OP_deref; DW_OP_deref)\n')) |
| |
| |
| if __name__ == '__main__': |
| unittest.main() |
| |
| |
