Messages in this thread | | | From | Shea Levy <> | Subject | Re: [PATCH 00/11] RISC-V: Resolve the issue of loadable module on 64-bit | Date | Tue, 13 Mar 2018 17:26:01 -0400 |
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Hello!
You may be interested in my recent patchset [1], which has known issues but addresses the same problems yours does. It differs in the approach taken here in that, rather than supporting GOT/PLT handling which we can't really take advantage of anyway, we simply build non-PIC modules instead [2]. Additionally, I see your patchset has the same concern mine does, which is that ignoring ALIGN relaxations is not actually an option [3]. The approach I plan to take is outlined by Palmer at [4].
As of now I hope to get back to my patchset this weekend, but if you're close to a complete implementation by then maybe I can avoid duplicating the work ;)
Thanks, Shea
[1]: http://lists.infradead.org/pipermail/linux-riscv/2018-February/000081.html [2]: http://lists.infradead.org/pipermail/linux-riscv/2018-February/000080.html [3]: http://lists.infradead.org/pipermail/linux-riscv/2018-February/000105.html [4]: http://lists.infradead.org/pipermail/linux-riscv/2018-March/000147.html Zong Li <zong@andestech.com> writes:
> These patches resolve the some issues of loadable module. > - symbol out of ranges > - unknown relocation types > > The reference of external variable and function symbols > cannot exceed 32-bit offset ranges in kernel module. > The module only can work on the 32-bit OS or the 64-bit > OS with sv32 virtual addressing. > > These patches will generate the .got, .got.plt and > .plt sections during loading module, let it can refer > to the symbol which locate more than 32-bit offset. > These sections depend on the relocation types: > - R_RISCV_GOT_HI20 > - R_RISCV_CALL_PLT > > These patches also support more relocation types > - R_RISCV_CALL > - R_RISCV_HI20 > - R_RISCV_LO12_I > - R_RISCV_LO12_S > - R_RISCV_RVC_BRANCH > - R_RISCV_RVC_JUMP > - R_RISCV_ALIGN > - R_RISCV_ADD32 > - R_RISCV_SUB32 > > Zong Li (11): > RISC-V: Add sections of PLT and GOT for kernel module > RISC-V: Add section of GOT.PLT for kernel module > RISC-V: Support GOT_HI20/CALL_PLT relocation type in kernel module > RISC-V: Support CALL relocation type in kernel module > RISC-V: Support HI20/LO12_I/LO12_S relocation type in kernel module > RISC-V: Support RVC_BRANCH/JUMP relocation type in kernel modulewq > RISC-V: Support ALIGN relocation type in kernel module > RISC-V: Support ADD32 relocation type in kernel module > RISC-V: Support SUB32 relocation type in kernel module > RISC-V: Enable module support in defconfig > RISC-V: Add definition of relocation types > > arch/riscv/Kconfig | 5 ++ > arch/riscv/Makefile | 3 + > arch/riscv/configs/defconfig | 2 + > arch/riscv/include/asm/module.h | 112 +++++++++++++++++++++++ > arch/riscv/include/uapi/asm/elf.h | 24 +++++ > arch/riscv/kernel/Makefile | 1 + > arch/riscv/kernel/module-sections.c | 156 ++++++++++++++++++++++++++++++++ > arch/riscv/kernel/module.c | 175 ++++++++++++++++++++++++++++++++++-- > arch/riscv/kernel/module.lds | 8 ++ > 9 files changed, 480 insertions(+), 6 deletions(-) > create mode 100644 arch/riscv/include/asm/module.h > create mode 100644 arch/riscv/kernel/module-sections.c > create mode 100644 arch/riscv/kernel/module.lds > > -- > 2.16.1 > > > _______________________________________________ > linux-riscv mailing list > linux-riscv@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-riscv [unhandled content-type:application/pgp-signature] | |