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author | Fangrui Song <maskray@google.com> | 2021-10-07 11:55:02 -0700 |
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committer | Fangrui Song <maskray@google.com> | 2021-10-07 11:55:02 -0700 |
commit | 490e6c62aa31a8aa5c4a059f6e646ede121edf0a (patch) | |
tree | 40bedb62d8b555792f91c82127b0f599da90ef39 /socket | |
parent | 349b0441dab375099b1d7f6909c1742286a67da9 (diff) | |
download | glibc-490e6c62aa31a8aa5c4a059f6e646ede121edf0a.tar.gz glibc-490e6c62aa31a8aa5c4a059f6e646ede121edf0a.tar.xz glibc-490e6c62aa31a8aa5c4a059f6e646ede121edf0a.zip |
elf: Avoid nested functions in the loader [BZ #27220]
dynamic-link.h is included more than once in some elf/ files (rtld.c, dl-conflict.c, dl-reloc.c, dl-reloc-static-pie.c) and uses GCC nested functions. This harms readability and the nested functions usage is the biggest obstacle prevents Clang build (Clang doesn't support GCC nested functions). The key idea for unnesting is to add extra parameters (struct link_map *and struct r_scope_elm *[]) to RESOLVE_MAP, ELF_MACHINE_BEFORE_RTLD_RELOC, ELF_DYNAMIC_RELOCATE, elf_machine_rel[a], elf_machine_lazy_rel, and elf_machine_runtime_setup. (This is inspired by Stan Shebs' ppc64/x86-64 implementation in the google/grte/v5-2.27/master which uses mixed extra parameters and static variables.) Future simplification: * If mips elf_machine_runtime_setup no longer needs RESOLVE_GOTSYM, elf_machine_runtime_setup can drop the `scope` parameter. * If TLSDESC no longer need to be in elf_machine_lazy_rel, elf_machine_lazy_rel can drop the `scope` parameter. Tested on aarch64, i386, x86-64, powerpc64le, powerpc64, powerpc32, sparc64, sparcv9, s390x, s390, hppa, ia64, armhf, alpha, and mips64. In addition, tested build-many-glibcs.py with {arc,csky,microblaze,nios2}-linux-gnu and riscv64-linux-gnu-rv64imafdc-lp64d. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Diffstat (limited to 'socket')
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