mirror of
https://github.com/Druthulu/BFM-decomp
synced 2026-09-27 05:56:00 -04:00
Drew T
5e0d80a887
- ld_interleave.py: argparse [ld] + --front/--tail (repeatable; default to the EXE's sandwich objects, transitional); the .data->.rodata->.data island is EXE-specific - Makefile extract: ld_interleave call wrapped in ifeq(BINARY,main) (overlays have no rodata island) and passes --front 53198.data.o --tail 6324C.data.o explicitly - GATES: positive extract+build -> 143dbb89 (tail_data=1 from the threaded flag); negative --tail BOGUS.data.o -> 'tail data object not found' exit=1 (threaded); restore -> 143dbb89
93 lines
4.5 KiB
Python
93 lines
4.5 KiB
Python
#!/usr/bin/env python3
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"""Reorder splat's generated linker script to honour a .data -> .rodata -> .data
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"sandwich" layout (Phase 7 Task 2', the rodata-island problem).
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splat emits one output section (`.main`) section-major in `section_order`
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(.rodata, .text, .data, .bss), which floats ALL rodata to one place. But this
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EXE's real layout puts .data on BOTH sides of the compiler rodata. For the
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SURGICAL LZSS carve (Phase 7), only jtbl_80072A38 is migrated to .rodata; the
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rest of the island stays raw inside the tail data object:
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.text 0x80010000 .. 0x800629DC
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.data (front) 0x800629DC .. 0x80072A38 531DC.data.o (globals, ptr tables)
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.rodata 0x80072A38 .. 0x80072A4C 800.o (ONLY the migrated LZSS jtbl_80072A38)
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.data (tail) 0x80072A4C .. 0x80074800 6324C.data.o (rest of island raw + tail globals)
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i.e. .data appears on BOTH sides of .rodata, which a single section_order can't
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express. This script rewrites the `.main {...}` body to the interleaved order:
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text -> front .data -> .rodata -> tail .data -> .bss, keeping splat's START/END/
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SIZE symbols. Front vs tail .data is decided by object basename (FRONT_DATA /
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TAIL_DATA). All other (empty) .data objects go in the front group.
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Idempotent: keyed off splat's exact section-major output; re-running on an
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already-patched script is a no-op (the markers won't match). Run post-extract.
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"""
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import re, sys, argparse
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_ap = argparse.ArgumentParser(description=__doc__, formatter_class=argparse.RawDescriptionHelpFormatter)
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_ap.add_argument("ld", nargs="?", default="build/us/SLUS_007.26.ld",
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help="splat-generated linker script to rewrite in place")
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_ap.add_argument("--front", action="append",
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help="object basename whose .data belongs to the FRONT region (repeatable)")
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_ap.add_argument("--tail", action="append",
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help="object basename whose .data belongs to the TAIL region (repeatable)")
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_a = _ap.parse_args()
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LD = _a.ld
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# object basenames whose (.data) belongs to the front / tail region. Defaults are the EXE's
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# LZSS-sandwich objects (TRANSITIONAL — the Makefile passes --front/--tail explicitly, and the
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# whole step is gated to BINARY=main since overlays have no rodata island). See cookbook §8.
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FRONT_DATA = tuple(_a.front) if _a.front else ("53198.data.o",)
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TAIL_DATA = tuple(_a.tail) if _a.tail else ("6324C.data.o",)
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src = open(LD).read()
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# Grab the .main output-section body (between its first '{' and matching '}').
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m = re.search(r"(\.main\b.*?\n[ \t]*\{\n)(.*?)(\n[ \t]*\})", src, re.S)
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if not m:
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sys.exit("ld_interleave: could not find .main { ... } block")
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head, body, tail = m.group(1), m.group(2), m.group(3)
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# Collect the object input-section lines by linker section, preserving order.
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def grab(section):
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# lines like: build/src/800.o(.rodata);
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return re.findall(rf"^[ \t]*build/\S+\({re.escape(section)}\);", body, re.M)
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text_lines = grab(".text")
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rodata_lines = grab(".rodata")
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data_lines = grab(".data")
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bss_lines = grab(".bss")
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def is_named(line, names):
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return any(n in line for n in names)
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front_data = [l for l in data_lines if not is_named(l, TAIL_DATA)]
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tail_data = [l for l in data_lines if is_named(l, TAIL_DATA)]
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# Sanity: front must contain the FRONT_DATA object.
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if not any(is_named(l, FRONT_DATA) for l in front_data):
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sys.exit("ld_interleave: front data object not found — config drift?")
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if not tail_data:
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sys.exit("ld_interleave: tail data object not found — config drift?")
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I = " " # 8-space indent matching splat's body
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def grp(start, lines, end_sym, size_sym):
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out = [f"{I}{start} = .;"]
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out += [f"{I}{l.strip()}" for l in lines]
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out += [f"{I}. = ALIGN(., 4);", f"{I}{end_sym} = .;"]
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if size_sym:
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out += [f"{I}{size_sym} = ABSOLUTE({end_sym} - {start});"]
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return out
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new = [f"{I}FILL(0x00000000);"]
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new += grp("main_TEXT_START", text_lines, "main_TEXT_END", "main_TEXT_SIZE")
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new += grp("main_DATA_START", front_data, "main_DATA_END", "main_DATA_SIZE")
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new += grp("main_RODATA_START", rodata_lines, "main_RODATA_END", "main_RODATA_SIZE")
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new += grp("main_DATA2_START", tail_data, "main_DATA2_END", "main_DATA2_SIZE")
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new += grp("main_BSS_START", bss_lines, "main_BSS_END", "main_BSS_SIZE")
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new_body = "\n".join(new)
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out = src[:m.start()] + head + new_body + tail + src[m.end():]
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open(LD, "w").write(out)
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print(f"ld_interleave: rewrote .main — text={len(text_lines)} "
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f"front_data={len(front_data)} rodata={len(rodata_lines)} "
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f"tail_data={len(tail_data)} bss={len(bss_lines)}")
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