Hi, The v1.20 release of pahole and its friends is out, mostly addressing problems related to gcc 11 defaulting to DWARF5 for -g, available at the usual places: Main git repo: git://git.kernel.org/pub/scm/devel/pahole/pahole.git Mirror git repo: https://github.com/acmel/dwarves.git tarball + gpg signature: https://fedorapeople.org/~acme/dwarves/dwarves-1.20.tar.xz https://fedorapeople.org/~acme/dwarves/dwarves-1.20.tar.bz2 https://fedorapeople.org/~acme/dwarves/dwarves-1.20.tar.sign Best Regards, - Arnaldo v1.20: BTF encoder: - Improve ELF error reporting using elf_errmsg(elf_errno()). - Improve objcopy error handling. - Fix handling of 'restrict' qualifier, that was being treated as a 'const'. - Support SHN_XINDEX in st_shndx symbol indexes, to handle ELF objects with more than 65534 sections, for instance, which happens with kernels built with 'KCFLAGS="-ffunction-sections -fdata-sections", Other cases may include when using FG-ASLR, LTO. - Cope with functions without a name, as seen sometimes when building kernel images with some versions of clang, when a SEGFAULT was taking place. - Fix BTF variable generation for kernel modules, not skipping variables at offset zero. - Fix address size to match what is in the ELF file being processed, to fix using a 64-bit pahole binary to generate BTF for a 32-bit vmlinux image. - Use kernel module ftrace addresses when finding which functions to encode, which increases the number of functions encoded. libbpf: - Allow use of packaged version, for distros wanting to dynamically link with the system's libbpf package instead of using the libbpf git submodule shipped in pahole's source code. DWARF loader: - Support DW_AT_data_bit_offset This appeared in DWARF4 but is supported only in gcc's -gdwarf-5, support it in a way that makes the output be the same for both cases. $ gcc -gdwarf-5 -c examples/dwarf5/bf.c $ pahole bf.o struct pea { long int a:1; /* 0: 0 8 */ long int b:1; /* 0: 1 8 */ long int c:1; /* 0: 2 8 */ /* XXX 29 bits hole, try to pack */ /* Bitfield combined with next fields */ int after_bitfield; /* 4 4 */ /* size: 8, cachelines: 1, members: 4 */ /* sum members: 4 */ /* sum bitfield members: 3 bits, bit holes: 1, sum bit holes: 29 bits */ /* last cacheline: 8 bytes */ }; - DW_FORM_implicit_const in attr_numeric() and attr_offset() - Support DW_TAG_GNU_call_site, its the standardized rename of the previously supported DW_TAG_GNU_call_site. build: - Fix compilation on 32-bit architectures. Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
