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 <z...@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
