]> git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/commit
tools: bpftool: resolve calls without using imm field
authorSandipan Das <sandipan@linux.vnet.ibm.com>
Thu, 24 May 2018 06:56:50 +0000 (12:26 +0530)
committerDaniel Borkmann <daniel@iogearbox.net>
Thu, 24 May 2018 07:20:49 +0000 (09:20 +0200)
commitf84192ee00b7d8b3c38545d3a61d4191f80cc81a
tree236e1f0dada1768797eafacdb707fcce1b59ceb9
parentdd0c5f072e650458feb307fe3a8602cc2ec369d4
tools: bpftool: resolve calls without using imm field

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 <daniel@iogearbox.net>
Signed-off-by: Sandipan Das <sandipan@linux.vnet.ibm.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
tools/bpf/bpftool/prog.c
tools/bpf/bpftool/xlated_dumper.c
tools/bpf/bpftool/xlated_dumper.h