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#!/usr/bin/env python3
from typing import Any, Dict, Optional
import json
import logging
import subprocess
import tempfile
import pathlib
import sys
import queue
import asm_differ.diff as asm_differ
MAX_FUNC_SIZE_LINES = 5000
class AsmDifferWrapper:
@staticmethod
def create_config(arch: asm_differ.ArchSettings) -> asm_differ.Config:
return asm_differ.Config(
arch=arch,
# Build/objdump options
diff_obj=True,
make=False,
source_old_binutils=True,
diff_section=".text",
inlines=False,
max_function_size_lines=MAX_FUNC_SIZE_LINES,
max_function_size_bytes=MAX_FUNC_SIZE_LINES * 4,
# Display options
formatter=asm_differ.AnsiFormatter(column_width=50),
threeway=None,
base_shift=0,
skip_lines=0,
compress=None,
show_branches=True,
show_line_numbers=False,
show_source=False,
stop_jrra=False,
ignore_large_imms=False,
ignore_addr_diffs=False,
algorithm="levenshtein",
)
@staticmethod
def run_objdump(target_data: bytes, config: asm_differ.Config, label: Optional[str]) -> Optional[str]:
flags = [
"--disassemble",
"--disassemble-zeroes",
"--line-numbers",
"--reloc",
]
with tempfile.TemporaryDirectory() as tempdir:
target_path = pathlib.Path(tempdir) / "out.s"
target_path.write_bytes(target_data)
start_addr = 0
if label:
nm_command = "mips-linux-gnu-nm"
if nm_command:
try:
nm_proc = subprocess.run(
[nm_command] + [target_path],
capture_output=True,
universal_newlines=True
)
except subprocess.CalledProcessError as e:
logger.error(f"Error running nm: {e}")
logger.error(e.stderr)
if nm_proc.stdout:
for line in nm_proc.stdout.splitlines():
if label in line:
start_addr = int(line.split()[0], 16)
break
else:
# logger.error(f"No nm command for {platform}")
return None
flags.append(f"--start-address={start_addr}")
objdump_command = "mips-linux-gnu-objdump"
cmds = [objdump_command] + config.arch.arch_flags + flags + [target_path]
try:
objdump_proc = subprocess.run(
[objdump_command] + config.arch.arch_flags + flags + [target_path],
capture_output=True,
universal_newlines=True
)
except subprocess.CalledProcessError as e:
# logger.error(e)
# logger.error(e.stderr)
return None
out = objdump_proc.stdout
return out
@staticmethod
def diff(target_elf: bytes, compiled_elf: bytes, diff_label:Optional[str]) -> Dict[str, Any]:
arch = asm_differ.get_arch("mips")
config = AsmDifferWrapper.create_config(arch)
# Base
if len(target_elf) == 0:
print("Base asm empty")
return
basedump = AsmDifferWrapper.run_objdump(target_elf, config, diff_label)
if not basedump:
print("Error running asm-differ on basedump")
return
if len(compiled_elf) == 0:
print("Creation of compilation elf_object failed")
return
mydump = AsmDifferWrapper.run_objdump(compiled_elf, config, diff_label)
if not mydump:
print("Error running asm-differ")
return
# Preprocess the dumps
basedump = asm_differ.preprocess_objdump_out(None, target_elf, basedump, config)
mydump = asm_differ.preprocess_objdump_out(None, compiled_elf, mydump, config)
try:
display = asm_differ.Display(basedump, mydump, config)
except Exception:
print("Error running asm-differ")
return
# Print the output
display.run_sync()
if __name__ == "__main__":
if len(sys.argv) != 3 and len(sys.argv) != 4:
print(f"Usage: {sys.argv[0]} [path/to/target.o] [path/to/compiled.o] [function name (optional)]")
sys.exit(0)
target = pathlib.Path(sys.argv[1])
compiled = pathlib.Path(sys.argv[2])
if len(sys.argv) == 4:
label = sys.argv[3]
else:
label = None
target_bytes = target.read_bytes()
compiled_bytes = compiled.read_bytes()
AsmDifferWrapper.diff(target_bytes, compiled_bytes, label)
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