258 lines
7.1 KiB
Python
Executable file
258 lines
7.1 KiB
Python
Executable file
#!/usr/bin/env python3
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import sys
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import argparse
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verbose = False
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class NotFDE(Exception):
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pass
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def func_name(infos, symtb):
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for sym in symtb:
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if infos["beg"] == symtb[sym][0]:
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return sym
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return None
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def parse_fde_head(line):
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spl = line.strip().split()
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assert len(spl) >= 2
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if spl[1] == "ZERO":
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raise NotFDE
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assert len(spl) >= 4
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typ = spl[3]
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if typ != "FDE":
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raise NotFDE
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assert len(spl) == 6
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pc_range = spl[5][3:]
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pc_beg, pc_end = map(lambda x: int(x, 16), pc_range.split(".."))
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return pc_beg, pc_end
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def parse_fde_row(line, ra_col, rbp_col):
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vals = list(map(lambda x: x.strip(), line.split()))
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assert len(vals) > ra_col # ra is the rightmost useful column
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out = {
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"LOC": int(vals[0], 16),
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"CFA": vals[1],
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"rbp": vals[rbp_col] if rbp_col else "u",
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"ra": vals[ra_col],
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}
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return out
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def clean_rows(rows):
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# Merge equivalent contiguous rows
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if not rows:
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return rows
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assert len(rows) > 0
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out_rows = [rows[0]]
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for row in rows[1:]:
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if not row == out_rows[-1]:
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out_rows.append(row)
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return out_rows
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def parse_fde(lines):
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assert len(lines) > 0
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try:
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pc_beg, pc_end = parse_fde_head(lines[0])
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except NotFDE:
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return
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rows = [{"LOC": 0, "CFA": "rsp+8", "rbp": "u", "ra": "c-8"}] # Implicit CIE row
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if len(lines) >= 2: # Has content
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head_row = list(map(lambda x: x.strip(), lines[1].split()))
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ra_col = head_row.index("ra")
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try:
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rbp_col = head_row.index("rbp")
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except ValueError:
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rbp_col = None
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for line in lines[2:]:
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rows.append(parse_fde_row(line, ra_col, rbp_col))
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return {"beg": pc_beg, "end": pc_end, "rows": clean_rows(rows)}
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def parse_eh_frame(handle, symtb):
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output = []
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cur_lines = []
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for line in handle:
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line = line.strip()
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if line == "===":
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return output
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if line.startswith("Contents of"):
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continue
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if line == "":
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if cur_lines != []:
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infos = parse_fde(cur_lines)
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if infos:
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symname = func_name(infos, symtb)
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if symname not in ["_start", "__libc_csu_init"]:
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# These functions have weird instructions
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output.append(infos)
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cur_lines = []
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else:
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cur_lines.append(line)
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return sorted(output, key=lambda x: x["beg"])
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def match_segments(orig_eh, synth_eh):
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out = []
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matches = [[False] * len(orig_eh), [False] * len(synth_eh)]
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for orig_id, orig_fde in enumerate(orig_eh):
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is_plt = False
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for row in orig_fde["rows"]:
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if row["CFA"] == "exp":
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is_plt = True
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for synth_id, synth_fde in enumerate(synth_eh):
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if orig_fde["beg"] == synth_fde["beg"]:
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if is_plt:
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matches[1][synth_id] = True # PLT -- fake match
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continue
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if matches[1][synth_id]:
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if verbose:
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print("Multiple matches (synth)")
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if matches[0][orig_id]:
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if verbose:
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print(
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"Multiple matches (orig) {}--{}".format(
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hex(orig_fde["beg"]), hex(orig_fde["end"])
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)
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)
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else:
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matches[0][orig_id] = True
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matches[1][synth_id] = True
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out.append((orig_fde, synth_fde))
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elif (
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is_plt
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and orig_fde["beg"] <= synth_fde["beg"]
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and synth_fde["end"] <= orig_fde["end"]
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):
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matches[1][synth_id] = True # PLT -- fake match
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if is_plt:
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matches[0][orig_id] = True # plt -- fake match
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unmatched_orig, unmatched_synth = [], []
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for orig_id, orig_match in enumerate(matches[0]):
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if not orig_match:
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unmatched_orig.append(orig_eh[orig_id])
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for synth_id, synth_match in enumerate(matches[1]):
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if not synth_match:
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unmatched_synth.append(synth_eh[synth_id])
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return out, unmatched_orig, unmatched_synth
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def fde_pos(fde):
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return "{}--{}".format(hex(fde["beg"]), hex(fde["end"]))
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def dump_light_fdes(fdes):
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for fde in fdes:
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print("FDE: {}".format(fde_pos(fde)))
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def match_fde(orig, synth):
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def vals_of(row):
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return {"CFA": row["CFA"], "ra": row["ra"], "rbp": row["rbp"]}
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def loc_of(rch):
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return rch[1]["LOC"]
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rows = [orig["rows"], synth["rows"]]
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cur_val = [vals_of(rows[0][0]), vals_of(rows[1][0])]
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rowchanges = []
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for typ in [0, 1]:
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for row in rows[typ]:
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rowchanges.append((typ, row))
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rowchanges.sort(key=loc_of)
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mismatch_count = 0
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for rowid, rowch in enumerate(rowchanges):
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typ, row = rowch[0], rowch[1]
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cur_val[typ] = vals_of(row)
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if len(rowchanges) > rowid + 1 and loc_of(rowch) == loc_of(
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rowchanges[rowid + 1]
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):
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continue
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if cur_val[0] != cur_val[1]:
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if verbose:
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print(
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"Mismatch {}: {} ; {}".format(
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hex(row["LOC"]), cur_val[0], cur_val[1]
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)
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)
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mismatch_count += 1
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return mismatch_count
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def parse_sym_table(handle):
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def readint(x):
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if x.startswith("0x"):
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return int(x[2:], 16)
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return int(x)
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out_map = {}
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for line in handle:
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line = line.strip()
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if line == "===":
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break
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spl = list(map(lambda x: x.strip(), line.split()))
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loc = int(spl[1], 16)
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size = readint(spl[2])
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name = spl[7]
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out_map[name] = (loc, size)
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return out_map
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def parse_args():
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parser = argparse.ArgumentParser()
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parser.add_argument(
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"-v", "--verbose", action="store_true", help="Display verbose results"
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)
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parser.add_argument(
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"test_name",
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action="store",
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help="Base path of the test case (eg. some_test/01)",
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)
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return parser.parse_args()
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def main():
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global verbose
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parser_args = parse_args()
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test_name = parser_args.test_name
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verbose = parser_args.verbose
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symtb = parse_sym_table(sys.stdin)
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orig_eh = parse_eh_frame(sys.stdin, symtb)
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synth_eh = parse_eh_frame(sys.stdin, symtb)
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matched, unmatched_orig, unmatched_synth = match_segments(orig_eh, synth_eh)
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# dump_light_fdes(unmatched_orig)
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# dump_light_fdes(unmatched_synth)
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mismatches = 0
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for (orig, synth) in matched:
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mismatches += match_fde(orig, synth)
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reports = []
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if mismatches > 0:
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reports.append("{} mismatches".format(mismatches))
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if unmatched_orig:
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reports.append("{} unmatched (orig)".format(len(unmatched_orig)))
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if unmatched_synth:
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reports.append("{} unmatched (synth)".format(len(unmatched_synth)))
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if reports:
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print("{}: {}".format(test_name, "; ".join(reports)))
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if __name__ == "__main__":
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main()
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