On Tue, 22 May 2018 22:46:09 +0530, Sandipan Das wrote: > Currently, we resolve the callee's address for a JITed function > call by using the imm field of the call instruction as an offset > from __bpf_call_base. If bpf_jit_kallsyms is enabled, we further > use this address to get the callee's kernel symbol's name. > > For some architectures, such as powerpc64, the imm field is not > large enough to hold this offset. So, instead of assigning this > offset to the imm field, the verifier now assigns the subprog > id. Also, a list of kernel symbol addresses for all the JITed > functions is provided in the program info. We now use the imm > field as an index for this list to lookup a callee's symbol's > address and resolve its name. > > Suggested-by: Daniel Borkmann <dan...@iogearbox.net> > Signed-off-by: Sandipan Das <sandi...@linux.vnet.ibm.com>
Reviewed-by: Jakub Kicinski <jakub.kicin...@netronome.com>
