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#!/usr/bin/env python3
# SPDX-FileCopyrightText: © 2025 ZeldaRET
# SPDX-License-Identifier: CC0-1.0
import argparse
import struct
import elftools.elf.elffile
# Patches mdebug for files linked with data_with_rodata.ld by replacing storage
# class stData with stRData, since .data symbols are now in the .rodata section
SC_MASK = 0x03E00000
SC_SHIFT = 21
def read_u32(f, offset):
f.seek(offset)
return struct.unpack(">I", f.read(4))[0]
def write_u32(f, offset, value):
f.seek(offset)
f.write(struct.pack(">I", value))
def patch_sc(f, offset):
value = read_u32(f, offset)
sc = (value & SC_MASK) >> SC_SHIFT
if sc == 2: # scData
value = (value & ~SC_MASK) | (15 << SC_SHIFT) # scRData
write_u32(f, offset, value)
def main():
parser = argparse.ArgumentParser()
parser.add_argument("file", help="input file")
args = parser.parse_args()
with open(args.file, "r+b") as f:
elf = elftools.elf.elffile.ELFFile(f)
mdebug_offset = 0
for section in elf.iter_sections():
if section.name == ".mdebug":
mdebug_offset = section["sh_offset"]
break
if mdebug_offset == 0:
return
isymMax = read_u32(f, mdebug_offset + 0x20)
cbSymOffset = read_u32(f, mdebug_offset + 0x24)
iextMax = read_u32(f, mdebug_offset + 0x58)
cbExtOffset = read_u32(f, mdebug_offset + 0x5C)
for i in range(isymMax):
patch_sc(f, cbSymOffset + i * 0xC + 0x8)
for i in range(iextMax):
patch_sc(f, cbExtOffset + i * 0x10 + 0xC)
if __name__ == "__main__":
main()
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