Em Mon, Jan 25, 2021 at 01:06:21PM +0000, Giuliano Procida escreveu: > Hi. > > This follows on from my change to improve the error handling around > llvm-objcopy in libbtf.c. > > Note on recipients: Please let me know if I should adjust To or CC. > > Note on style: I've generally placed declarations as allowed by C99, > closest to point of use. Let me know if you'd prefer otherwise. > > 1. Improve ELF error reporting applied > 2. Add .BTF section using libelf > > This shows the minimal amount of code needed to drive libelf. However, > it leaves layout up to libelf, which is almost certainly not wanted. > > As an unexpcted side-effect, vmlinux is larger than before. It seems > llvm-objcopy likes to trim down .strtab. We have to test this thoroughly, I'm adding support to gcc's -gdwarf-5 DW_AT_data_bit_offset, I think I should get that done and release 1.20, if some bug is still left on that new code, we can just fallback to -gdwarf-4. Then get back to the last 2 patches in your series, ok? - Arnaldo > 3. Manually lay out updated ELF sections > > This does full layout of new and updated ELF sections. If the update > ELF sections were not the last ones in the file by offset, then it can > leave gaps between sections. > > 4. Align .BTF section to 8 bytes > > This was my original aim. > > Regards. > > Giuliano Procida (4): > btf_encoder: Improve ELF error reporting > btf_encoder: Add .BTF section using libelf > btf_encoder: Manually lay out updated ELF sections > btf_encoder: Align .BTF section to 8 bytes > > libbtf.c | 222 +++++++++++++++++++++++++++++++++++++++++++------------ > 1 file changed, 175 insertions(+), 47 deletions(-) > > -- > 2.30.0.280.ga3ce27912f-goog > -- - Arnaldo
