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- #!/usr/bin/env python
- # SPDX-License-Identifier: GPL-2.0
- # libxed.py: Python wrapper for libxed.so
- # Copyright (c) 2014-2021, Intel Corporation.
- # To use Intel XED, libxed.so must be present. To build and install
- # libxed.so:
- # git clone https://github.com/intelxed/mbuild.git mbuild
- # git clone https://github.com/intelxed/xed
- # cd xed
- # ./mfile.py --share
- # sudo ./mfile.py --prefix=/usr/local install
- # sudo ldconfig
- #
- import sys
- from ctypes import CDLL, Structure, create_string_buffer, addressof, sizeof, \
- c_void_p, c_bool, c_byte, c_char, c_int, c_uint, c_longlong, c_ulonglong
- # XED Disassembler
- class xed_state_t(Structure):
- _fields_ = [
- ("mode", c_int),
- ("width", c_int)
- ]
- class XEDInstruction():
- def __init__(self, libxed):
- # Current xed_decoded_inst_t structure is 192 bytes. Use 512 to allow for future expansion
- xedd_t = c_byte * 512
- self.xedd = xedd_t()
- self.xedp = addressof(self.xedd)
- libxed.xed_decoded_inst_zero(self.xedp)
- self.state = xed_state_t()
- self.statep = addressof(self.state)
- # Buffer for disassembled instruction text
- self.buffer = create_string_buffer(256)
- self.bufferp = addressof(self.buffer)
- class LibXED():
- def __init__(self):
- try:
- self.libxed = CDLL("libxed.so")
- except:
- self.libxed = None
- if not self.libxed:
- self.libxed = CDLL("/usr/local/lib/libxed.so")
- self.xed_tables_init = self.libxed.xed_tables_init
- self.xed_tables_init.restype = None
- self.xed_tables_init.argtypes = []
- self.xed_decoded_inst_zero = self.libxed.xed_decoded_inst_zero
- self.xed_decoded_inst_zero.restype = None
- self.xed_decoded_inst_zero.argtypes = [ c_void_p ]
- self.xed_operand_values_set_mode = self.libxed.xed_operand_values_set_mode
- self.xed_operand_values_set_mode.restype = None
- self.xed_operand_values_set_mode.argtypes = [ c_void_p, c_void_p ]
- self.xed_decoded_inst_zero_keep_mode = self.libxed.xed_decoded_inst_zero_keep_mode
- self.xed_decoded_inst_zero_keep_mode.restype = None
- self.xed_decoded_inst_zero_keep_mode.argtypes = [ c_void_p ]
- self.xed_decode = self.libxed.xed_decode
- self.xed_decode.restype = c_int
- self.xed_decode.argtypes = [ c_void_p, c_void_p, c_uint ]
- self.xed_format_context = self.libxed.xed_format_context
- self.xed_format_context.restype = c_uint
- self.xed_format_context.argtypes = [ c_int, c_void_p, c_void_p, c_int, c_ulonglong, c_void_p, c_void_p ]
- self.xed_tables_init()
- def Instruction(self):
- return XEDInstruction(self)
- def SetMode(self, inst, mode):
- if mode:
- inst.state.mode = 4 # 32-bit
- inst.state.width = 4 # 4 bytes
- else:
- inst.state.mode = 1 # 64-bit
- inst.state.width = 8 # 8 bytes
- self.xed_operand_values_set_mode(inst.xedp, inst.statep)
- def DisassembleOne(self, inst, bytes_ptr, bytes_cnt, ip):
- self.xed_decoded_inst_zero_keep_mode(inst.xedp)
- err = self.xed_decode(inst.xedp, bytes_ptr, bytes_cnt)
- if err:
- return 0, ""
- # Use AT&T mode (2), alternative is Intel (3)
- ok = self.xed_format_context(2, inst.xedp, inst.bufferp, sizeof(inst.buffer), ip, 0, 0)
- if not ok:
- return 0, ""
- if sys.version_info[0] == 2:
- result = inst.buffer.value
- else:
- result = inst.buffer.value.decode()
- # Return instruction length and the disassembled instruction text
- # For now, assume the length is in byte 166
- return inst.xedd[166], result
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