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ELF: Implement GetSections() with both SHT and PHT

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This commit is contained in:
Katy Coe
2020-12-04 15:40:16 +01:00
parent 5f03abcff7
commit bb0badeb40
2 changed files with 44 additions and 2 deletions
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33
Il2CppInspector.Common/FileFormatReaders/ElfReader.cs
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@@ -463,6 +463,39 @@ namespace Il2CppInspector
return init_array.Select(x => MapVATR(x)).ToArray();
}
public override IEnumerable<Section> GetSections() {
// If the sections have been stripped, use the segment list from the PHT instead
if (section_header_table.All(s => conv.Int(s.sh_offset) == 0)) {
return program_header_table.Select(p => new Section {
VirtualStart = conv.ULong(p.p_vaddr),
VirtualEnd = conv.ULong(p.p_vaddr) + conv.ULong(p.p_memsz) - 1,
ImageStart = (uint) conv.Int(p.p_offset),
ImageEnd = (uint) conv.Int(p.p_offset) + (uint) conv.Int(p.p_filesz) - 1,
// Not correct but probably the best we can do
IsData = (Elf) p.p_type == Elf.PT_LOAD,
IsExec = (Elf) p.p_type == Elf.PT_LOAD,
IsBSS = (Elf) p.p_type == Elf.PT_LOAD,
Name = string.Empty
});
}
// Return sections list
return section_header_table.Select(s => new Section {
VirtualStart = conv.ULong(s.sh_addr),
VirtualEnd = conv.ULong(s.sh_addr) + conv.ULong(s.sh_size) - 1,
ImageStart = (uint) conv.Int(s.sh_offset),
ImageEnd = (uint) conv.Int(s.sh_offset) + (uint) conv.Int(s.sh_size) - 1,
IsData = ((Elf) conv.Int(s.sh_flags) & Elf.SHF_ALLOC) == Elf.SHF_ALLOC && ((Elf) conv.Int(s.sh_flags) & Elf.SHF_EXECINSTR) == 0 && ((Elf) s.sh_type & Elf.SHT_PROGBITS) == Elf.SHT_PROGBITS,
IsExec = ((Elf) conv.Int(s.sh_flags) & Elf.SHF_EXECINSTR) == Elf.SHF_EXECINSTR && ((Elf) s.sh_type & Elf.SHT_PROGBITS) == Elf.SHT_PROGBITS,
IsBSS = ((Elf) s.sh_type & Elf.SHT_NOBITS) == Elf.SHT_NOBITS,
Name = sectionByName.First(sbn => conv.Int(sbn.Value.sh_offset) == conv.Int(s.sh_offset)).Key
});
}
// Map a virtual address to an offset into the image file. Throws an exception if the virtual address is not mapped into the file.
// Note if uiAddr is a valid segment but filesz < memsz and the adjusted uiAddr falls between the range of filesz and memsz,
// an exception will be thrown. This area of memory is assumed to contain all zeroes.