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77 lines
2.3 KiB
Python
77 lines
2.3 KiB
Python
#!/usr/bin/env python3
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from argparse import ArgumentParser
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from elftools.elf.constants import P_FLAGS
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from elftools.elf.elffile import ELFFile
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import io
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def segment_is_text(segment):
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return segment['p_flags'] & P_FLAGS.PF_X == P_FLAGS.PF_X
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def segment_is_data(segment):
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return not segment_is_text(segment) and not segment_is_bss(segment)
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def segment_is_bss(segment):
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return segment['p_filesz'] == 0
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def write_to_dol_header(file, offset, val):
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file.seek(offset)
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file.write(val.to_bytes(4, byteorder = 'big'))
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file.seek(0, io.SEEK_END)
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def write_segment_to_dol(idx, segment, dol_file):
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write_to_dol_header(dol_file, 0x00 + 0x04 * idx, dol_file.tell())
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write_to_dol_header(dol_file, 0x48 + 0x04 * idx, segment['p_vaddr'])
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# align filesz to 0x20
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filesz = ((segment['p_filesz'] + 0x1F) >> 5) << 5
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write_to_dol_header(dol_file, 0x90 + 0x04 * idx, filesz)
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dol_file.write(segment.data())
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# align current dol size to 0x20
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size = 0x20 - dol_file.tell() & 0x1F
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dol_file.write(bytes([0x00] * size))
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parser = ArgumentParser()
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parser.add_argument('in_path')
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parser.add_argument('out_path')
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args = parser.parse_args()
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with open(args.in_path, 'rb') as elf_file, open(args.out_path, 'wb') as dol_file:
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elf_file = ELFFile(elf_file)
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num_segments = elf_file.num_segments()
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dol_file.write(bytes([0x00] * 0x100))
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idx = 0
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for i in range(num_segments):
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segment = elf_file.get_segment(i)
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if not segment_is_text(segment):
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continue
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write_segment_to_dol(idx, segment, dol_file)
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idx += 1
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idx = 7
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for i in range(num_segments):
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segment = elf_file.get_segment(i)
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if not segment_is_data(segment):
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continue
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write_segment_to_dol(idx, segment, dol_file)
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idx += 1
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bss_start = 0
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bss_end = 0
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for i in range(num_segments):
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segment = elf_file.get_segment(i)
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if not segment_is_bss(segment):
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continue
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if bss_start == 0:
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bss_start = segment['p_vaddr']
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bss_end = segment['p_vaddr'] + segment['p_memsz']
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write_to_dol_header(dol_file, 0xD8, bss_start)
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bss_size = bss_end - bss_start
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write_to_dol_header(dol_file, 0xDC, bss_size)
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write_to_dol_header(dol_file, 0xE0, elf_file['e_entry'])
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