SashegDev
53 lines
1.6 KiB
Python
53 lines
1.6 KiB
Python
#!/usr/bin/env python3
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"""edp_carve.py — точная нарезка ELF из Emergency Payload (.edp) по program headers.
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Использование: ./tools/edp_carve.py fw/dl/edp-archorg-1127.edp out-dir/
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"""
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import os
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import struct
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import sys
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def elf_span(d, off):
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assert d[off:off + 4] == b"\x7fELF", "not ELF"
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entry = struct.unpack("<I", d[off + 24:off + 28])[0]
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phoff = struct.unpack("<I", d[off + 28:off + 32])[0]
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phnum = struct.unpack("<H", d[off + 44:off + 46])[0]
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end = 0
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segs = []
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for i in range(phnum):
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p = off + phoff + i * 32
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ptype, poff, pv, pp, pfsz, pmsz, flg, al = struct.unpack("<IIIIIIII", d[p:p + 32])
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if ptype == 1: # PT_LOAD
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segs.append((pv, pfsz, pmsz, flg))
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end = max(end, poff + pfsz)
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return entry, segs, end
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def main():
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src, outdir = sys.argv[1], sys.argv[2]
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d = open(src, "rb").read()
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offs = []
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i = 0
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while True:
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i = d.find(b"\x7fELF", i)
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if i < 0:
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break
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offs.append(i)
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i += 1
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os.makedirs(outdir, exist_ok=True)
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print(f"{len(offs)} ELFs")
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for n, o in enumerate(offs):
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try:
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entry, segs, end = elf_span(d, o)
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except Exception as e:
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print(n, f"off={o} PARSE-FAIL {e}")
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continue
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open(f"{outdir}/img{n}.elf", "wb").write(d[o:o + end])
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mem = sum(s[2] for s in segs)
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print(f"img{n}: off={o} size={end} entry={entry:#x} mem={mem} "
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+ " ".join(f"[{v:#x}+{ms:#x}{'X' if fl & 1 else ''}]" for v, fz, ms, fl in segs))
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if __name__ == "__main__":
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main()
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