https://sourceware.org/bugzilla/show_bug.cgi?id=22452
--- Comment #10 from H. Brueckner <brueckner at linux dot vnet.ibm.com> --- (In reply to Mark Wielaard from comment #9) > (In reply to H. Brueckner from comment #8) > > (In reply to Mark Wielaard from comment #5) > > > (In reply to Mark Wielaard from comment #4) > > > > So, if you could provide the output of eu-readelf --relocs paes_s390.ko > > > > (on > > > > your combined paes_s390.ko containing both code and debug) that would be > > > > helpful. > > > > > > eu-readelf --debug-dump=frames --relocs paes_s390.ko > > > > > > > Just attached the output; also the output of the binutils readelf command > > for comparision. I guess that there are some more issues because lots of > > invalid relocations are listed. > > Is that eu-readelf from a distro install? Then there is something wrong with > that install. If it is a build from source then make sure LD_LIBRARY_PATH > contains the backends directory that has libebl_s390.so. Otherwise > eu-readelf won't know about machine specific ELF/DWARF mappings (like the > relocation types/names). It was a local built and install, the LD_LIBRARY_PATH was not set properly. However, setting is correctly, the relocation are displayed like with readelf. Will update the attachment soon. > > But the output does confirm what I feared. The R_390_PC32 .rela.eh_frame > relocations are not "simple". They are load based. So now it comes to that point I have feared, as it looks like the libdw just performs "simple" relocations. Your comment and the ebl_reloc_simple_type() call in libdwfl/relocate.c proofs that. Anyhow, do you plan to extend the relocation code to support more complex relocations tool? > It might not be too hard to add support for those. What needs to be done / is necessary for that? > But if there is any > possibility to generate .debug_frame based CFI for the s390x kernel modules > that would IMHO a much better/simpler solution because it makes things more > in line with other arches. It should also make the kernel modules smaller. > Does anything actually use the loaded .eh_frame CFI on s390x? I will check the module usage on .eh_frame and will have a try on including the CFI in the .debug_frame. Thanks. -- You are receiving this mail because: You are on the CC list for the bug.
