Messages in this thread | | | Subject | Re: [PATCH v3 0/4] LoongArch: Support new relocation types | From | Youling Tang <> | Date | Fri, 29 Jul 2022 10:23:24 +0800 |
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Hi, Ruoyao
On 07/29/2022 10:07 AM, Xi Ruoyao wrote: > The version 2.00 of LoongArch ELF ABI specification introduced new > relocation types, and the development tree of Binutils and GCC has > started to use them. If the kernel is built with the latest snapshot of > Binutils or GCC, it will fail to load the modules because of unrecognized > relocation types in modules. > > Add support for GOT and new relocation types for the module loader, so > the kernel (with modules) can be built with the "normal" code model and > function properly. > > This series does not break the compatibility with old toolchain using > stack-based relocation types, so with the patches applied the kernel can > be be built with both old and new toolchains. > > Tested by building the kernel with both Binutils & GCC master branch and > my system Binutils & GCC (without new relocation type support), running > both the builds with 35 in-tree modules loaded, and loading one module > with 20 GOT loads (loaded addresses verified by comparing with > /proc/kallsyms). > > Changes from v2 to v3: > > - Use `union loongarch_instruction` instead of explicit bit shifts > applying the relocation. Suggested by Youling. > - For R_LARCH_B26, move the alignment check before the range check to be > consistent with stack pop relocations. Suggested by Youling. > - Reword the commit message of the 3rd patch. Suggested by Huacai.
The log of changes from v1 to v2 should be preserved.
Thanks, Youling > > Xi Ruoyao (4): > LoongArch: Add section of GOT for kernel module > LoongArch: Support R_LARCH_SOP_PUSH_GPREL relocation type in kernel > module > LoongArch: Remove -fplt and -Wa,-mla-* from CFLAGS > LoongArch: Support modules with new relocation types > > arch/loongarch/Makefile | 4 -- > arch/loongarch/include/asm/elf.h | 37 ++++++++++ > arch/loongarch/include/asm/module.h | 23 ++++++ > arch/loongarch/include/asm/module.lds.h | 1 + > arch/loongarch/kernel/head.S | 10 +-- > arch/loongarch/kernel/module-sections.c | 51 +++++++++++-- > arch/loongarch/kernel/module.c | 96 +++++++++++++++++++++++++ > 7 files changed, 209 insertions(+), 13 deletions(-) >
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