Messages in this thread | | | From | Zong Li <> | Date | Fri, 16 Mar 2018 09:18:41 +0800 | Subject | Re: [PATCH v2 00/11] RISC-V: Resolve the issue of loadable module on 64-bit |
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2018-03-15 16:50 GMT+08:00 Zong Li <zong@andestech.com>: > 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 > > This is the list of testing modules: > # lsmod > btrfs 7876158 0 - Live 0xffffffd00745d000 > ramoops 90806 0 - Live 0xffffffd0024b8000 > lzo 10554 0 - Live 0xffffffd002050000 > zstd_decompress 567575 1 btrfs, Live 0xffffffd00238b000 > zstd_compress 1543837 1 btrfs, Live 0xffffffd002211000 > zram 101300 0 - Live 0xffffffd0021b8000 > xxhash 62254 2 zstd_decompress,zstd_compress, Live 0xffffffd0020cf000 > xor 33246 1 btrfs, Live 0xffffffd002042000 > xfs 4395343 0 - Live 0xffffffd00399e000 > tun 252041 0 - Live 0xffffffd0038e0000 > test_user_copy 5265 0 - Live 0xffffffd003783000 > test_static_keys 19606 0 - Live 0xffffffd003717000 > test_static_key_base 7374 1 test_static_keys, Live 0xffffffd0036dc000 > test_printf 7804 0 [permanent], Live 0xffffffd00369c000 > test_module 1557 0 - Live 0xffffffd003646000 > test_kmod 49100 0 - Live 0xffffffd0035f2000 > test_bpf 1599301 0 - Live 0xffffffd003000000 > test_bitmap 4403 0 - Live 0xffffffd002dd8000 > reed_solomon 38866 1 ramoops, Live 0xffffffd002d86000 > raid6_pq 161872 1 btrfs, Live 0xffffffd002b9e000 > netdevsim 65401 0 - Live 0xffffffd002910000 > > Signed-off-by: Zong Li <zong@andestech.com> > --- > Change in v2: > - Add compile option 'mno-relax' for build kernel module > - Just fail on ALIGN type, this is unexpected type with mno-relax. > > 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 | 5 + > arch/riscv/configs/defconfig | 2 + > arch/riscv/include/asm/module.h | 113 +++++++++++++++++++++++ > arch/riscv/include/uapi/asm/elf.h | 7 ++ > arch/riscv/kernel/Makefile | 1 + > arch/riscv/kernel/module-sections.c | 156 +++++++++++++++++++++++++++++++ > arch/riscv/kernel/module.c | 179 ++++++++++++++++++++++++++++++++++-- > arch/riscv/kernel/module.lds | 8 ++ > 9 files changed, 470 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 >
Hi,
The ALIGN relocation type is just fail and print the error message on v2 version, Because I think that it will not exist in module which building with 'mno-relax ' option, The behavior of check alignment will become a redundant thing.
Thanks a lot.
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