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arti
6338095683
Andrew Morton's Unix-hosted assembler/linker for the TMS34010, fetched from the gsptools archive and patched to build on x86-64. The K&R sources silently truncate pointers there: implicit int parameter declarations and fixed-argument printf wrappers. The patch fixes those and the flex 2.6 yy_init mismatch. hello.as34.g is harness/hello-world/hello.asm in as34 syntax. as34/ld34 reproduce the GSPA-built payload byte-for-byte (82 bytes, md5 db91788991ebba476b55a11127a36475), and the MAME hello.lua run reports the same markers, the same 1024-word VRAM block and a byte-identical frame. build.sh downloads the upstream tarball at build time (sha256 pinned); the tree is not vendored.
75 lines
2.4 KiB
Python
Executable File
75 lines
2.4 KiB
Python
Executable File
#!/usr/bin/env python3
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"""Extract the loadable .text bytes from an as34/ld34 g.out file.
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g.out is not COFF. It uses the .go/linkhdr format from binutils/link.h
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(LINKMAGIC 0x3abf782e), packed with #pragma pack(2).
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IMPORTANT: link.h declares the header fields that hold addresses and sizes
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as `long`. On the original 32-bit Unix hosts that is 4 bytes; on x86-64 it
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is 8, so the written header is 156 bytes here instead of the historical 80.
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as34 and ld34 are both rebuilt with the same compiler, so they agree with
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each other and with this parser. A stable on-disk format would need `long`
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changed to int32_t in link.h.
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Layout as written by this 64-bit build (offsets in bytes):
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off field
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0 short swapped
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2 long magic
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10 short flags
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12 long time
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20 long textstart file position of text
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28 long textsize size in BYTES
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36 long datastart
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44 long datasize
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52 long bsssize
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60 long relocstart
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68 long nrelocs
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76 long symtabstart
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84 long nsyms
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92 long stabstart
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100 long nstabs
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108 long stringstart
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116 long stringSize
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124 long textLoadAddress BIT address
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132 long dataLoadAddress
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140 long bssLoadAddress
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148 long entrypoint BIT address
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"""
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import hashlib
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import struct
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import sys
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LINKMAGIC = 0x3ABF782E
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def main(out_path, bin_path):
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d = open(out_path, "rb").read()
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fields = struct.unpack_from("<hqh" + "q" * 18, d, 0)
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(swapped, magic, flags, _time, textstart, textsize,
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_datastart, _datasize, _bsssize, _relocstart, _nrelocs,
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_symtabstart, _nsyms, _stabstart, _nstabs,
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_stringstart, _stringsize,
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textload, _dataload, _bssload, entry) = fields
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if magic != LINKMAGIC:
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sys.exit("extract: bad magic %#010x" % magic)
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if swapped:
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sys.exit("extract: byte-swapped header not handled")
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payload = d[textstart:textstart + textsize]
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if len(payload) != textsize:
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sys.exit("extract: truncated text (%d of %d bytes)"
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% (len(payload), textsize))
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open(bin_path, "wb").write(payload)
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print("origin=%08X (bits) size=%d bytes entry=%08X file_offset=%#x md5=%s"
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% (textload, textsize, entry, textstart,
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hashlib.md5(payload).hexdigest()))
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if __name__ == "__main__":
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if len(sys.argv) != 3:
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sys.exit("usage: extract.py hello.out payload.bin")
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main(sys.argv[1], sys.argv[2])
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