Public bug reported: == Comment: #0 == Systemtap isn't able to get any hit on most of the kernel and user space functions on ppc64 LE. PPC64 ELF ABI v2 has a Global entry point and a local entry point for the functions. We need the Local entry point in order to probe these functions. However, the DIE for these functions in debuginfo return the function.entrypc which is same as the global entry point. The local entry point is not encoded in the debuginfo of the ELFs. The offset to local entry point is however encoded in the st_other field of these symbols in the symbol table. We need to use this field to adjust the sym.st_value to actually point to the local entry point instead of the global entry point.
The patches are already merged with upstream systemtap. Here are the links to the patches : https://sourceware.org/git/gitweb.cgi?p=systemtap.git;a=commit;h=d16f315faaffbff7a495f26859ce6c200d7667fa : Generic bugfix for dwarfless probing into multiple static functions with same names https://sourceware.org/git/gitweb.cgi?p=systemtap.git;a=commit;h=66ac435c7cb7b907642ebfd4daf4d84cdca242a3 : Testcase for the above fix https://sourceware.org/git/gitweb.cgi?p=systemtap.git;a=commit;h=b4c6a4b1cd00fd1681d76de6850a88aa516c4fef : Prioritize symbol lookup for ABIv2 (for ppc64LE) ** Affects: ubuntu Importance: Undecided Status: New ** Tags: architecture-ppc64le bugnameltc-126987 severity-high targetmilestone-inin1510 ** Tags added: architecture-ppc64le bugnameltc-126987 severity-high targetmilestone-inin1510 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1486352 Title: [Feature] Systemtap probes supoort on ppc64LE To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1486352/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
