On Tue, 11 Dec 2012 10:33:06 +0100, Jan Kratochvil wrote: > This is the disagreement, so goint to write down here a question to IBM ABI > authority, we can agree upon the question and send it.
Are you fine with the mail below? Thanks, Jan ------------------------------------------------------------------------------ To: [email protected] Subject: PowerPC64 ABI function descriptors question Hello, asking here for the IBM ppc64 ABI, unrelated to binutils itself. elfutils should get a resolver of ppc64 .opd: [patch] Resolve ppc64 func descriptors as .func (via .opd) Message-ID: <[email protected]> https://lists.fedorahosted.org/pipermail/elfutils-devel/2012-October/002650.html https://lists.fedorahosted.org/pipermail/elfutils-devel/2012-November/002743.html https://lists.fedorahosted.org/pipermail/elfutils-devel/2012-December/002798.html So that the backtraces are readable on ppc64 such as: # 0 0x10007fa8 __vmx__sigsetjmp_ent | # 0 0x10007fa8 .raise # 1 0x10008370 - 1 __vmx__sigsetjmp_ent | # 1 0x10008370 - 1 .abort # 2 0x10001344 - 1 (null) | # 2 0x10001344 - 1 .sigusr2 (the addresses in backtrace are entry points, not function descriptors) I would not like to break / confuse ppc64 ABI naming so asking here. FYI elfutils address -> name resolver (dwfl_module_addrsym) currently does not / cannot use DWARF, we talk only about ELF symbols. Should the backtrace resolved names be dot-prefixed (".raise") or not ("raise")? http://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi-1.9.html#FUNC-DES says they should be dot-prefixed - as they are ELF symbols. But usually in GDB the backtrace is without dots #0 raise #1 abort #2 sigusr2 as DWARF symbols get used instead and DWARF does not use the dot prefix. If elfutils had name -> address resolver (still without DWARF capability) which address should be resolved for "raise"? Should be ".raise" also resolved? It is clear that BFD currently uses: raise for ELF function descriptor .raise for ELF code entry point raise for DWARF code entry point, overriding the ELF function descriptor _______________________________________________ elfutils-devel mailing list [email protected] https://lists.fedorahosted.org/mailman/listinfo/elfutils-devel
