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dwarf dump fails on ProDG compiled PSP ELF (Failed: Unhandled .debug relocation type Absolute) #118
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ProDG for PSP uses DWARFv2 as its debug info format, by extension the game you mention also has DWARFv2 debug info, which is out of the scope of dtk's dwarf dump.EDIT: Okay nvm, seems like it has both kinds of debug info DWARFv2 from GCC and DWARFv1 from SNC, I was too quick to say that after seeing the DWARFv2 debug sections.
After that derp moment I decided to take a look, main changes seem to be:
- dtk doesn't apply any MIPS relocs when loading the debug section, adding
elf::R_MIPS_32to this line allows it to continue past the relocation error (but it's likely the wrong solution) - SN added DWARFv2's
DW_FORM_strpto allDW_AT_nameattributes, instead of an inline string they are a pointer into.debug_str - They use
DW_TAG_pointer_typefor pointers, the tag just has a singleDW_AT_user_def_typewith a REF to the pointed-to type - New fundamental type,
0xF201, which maps tobool(size 1 byte) according to the demangler
That seems to be all the stuff missing from dtk that blocks it from working with the mentioned game, I hit the codebase (and my head) with a hammer until it could produce this PMR_PSPwSYM.txt which looks correct-ish (ignoring the horribly wrong range and addresses)
Reacted by Rib- dtk doesn't apply any MIPS relocs when loading the debug section, adding
Small addendum, the only SN compiler version available (which is later than the one used in Pacman) has some differences:
DW_TAG_typedefandDW_TAG_pointer_typeentries apparently have noDW_AT_sibling(no idea why)- New tag
0x8100,DW_TAG_SN_namespaceseems to only haveDW_AT_nameand optionally children with the same tag (for nested namespaces), default namespace is:: - New attribute
0x8100,DW_AT_SN_namespace_memberusesDW_FORM_refto point to the relevantDW_TAG_SN_namespaceentry
While I know DTK is mostly aimed at GameCube/Wii, I have found it incredibly useful for parsing out DWARF1 symbols into a human readable format on ELFs for other systems, as no other tool seems capable of this.
Pac-Man Rally (Europe) (En,Fr,De,Es,It) (Proto) (2007-05-01) contains an unstripped ELF with DWARF1 symbols with the name
PMR_PSPwSYM.prx(despite the extension this is in fact an ELF and not a PRX), however when I try and parse the symbols with DTK I get the errorFailed: Unhandled .debug relocation type Absolute. The game is compiled with ProDG which is where I assume the problem lies as it's not the usual compiler even for PSP, and has some quirks.