On Sun, Jan 24, 2021 at 2:18 PM Jiri Olsa <jolsa@xxxxxxxxxx> wrote: > > For very large ELF objects (with many sections), we could > get special value SHN_XINDEX (65535) for symbol's st_shndx. > > This patch is adding code to detect the optional extended > section index table and use it to resolve symbol's section > index. > > Adding elf_symtab__for_each_symbol_index macro that returns > symbol's section index and usign it in collect functions. > > Tested by running pahole on kernel compiled with: > make KCFLAGS="-ffunction-sections -fdata-sections" -j$(nproc) vmlinux > > and ensure FUNC records are generated and match normal > build (without above KCFLAGS). > > Also bpf selftest passed and generated kernel BTF, > is same as without the patch. > > Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx> > --- Acked-by: Andrii Nakryiko <andrii@xxxxxxxxxx> > btf_encoder.c | 33 +++++++++++++++++---------------- > elf_symtab.c | 41 +++++++++++++++++++++++++++++++++++++++-- > elf_symtab.h | 29 +++++++++++++++++++++++++++++ > 3 files changed, 85 insertions(+), 18 deletions(-) > [...]
