A handful of module relocations were missing, this patch includes the remaining ones. I also wrote some test cases to ensure that module loading works properly. Some relocations cannot be supported in the kernel, these include the ones that rely on thread local storage and dynamic linking. ULEB128 handling is a bit special because SET and SUB relocations must happen together, and SET must happen before SUB. The module linking ignores a SET unless it is followed by a SUB. In order to find the corresponding SET, module linking starts at the relocation above the SUB and iterates up until it hits the SET. If a SET is not found, module linking fails. This can be tested by enabling KUNIT, RUNTIME_KERNEL_TESTING_MENU, and RISCV_MODULE_LINKING_KUNIT. Signed-off-by: Charlie Jenkins <charlie@xxxxxxxxxxxx> --- Changes in v2: - Added ULEB128 relocations - Link to v1: https://lore.kernel.org/r/20230913-module_relocations-v1-0-bb3d8467e793@xxxxxxxxxxxx --- Charlie Jenkins (2): riscv: Add remaining module relocations riscv: Add tests for riscv module loading arch/riscv/Kconfig.debug | 1 + arch/riscv/include/uapi/asm/elf.h | 6 +- arch/riscv/kernel/Makefile | 1 + arch/riscv/kernel/module.c | 247 ++++++++++++++++++--- arch/riscv/kernel/tests/Kconfig.debug | 32 +++ arch/riscv/kernel/tests/Makefile | 1 + arch/riscv/kernel/tests/module_test/Makefile | 15 ++ .../tests/module_test/test_module_linking_main.c | 73 ++++++ arch/riscv/kernel/tests/module_test/test_set16.S | 23 ++ arch/riscv/kernel/tests/module_test/test_set32.S | 20 ++ arch/riscv/kernel/tests/module_test/test_set6.S | 23 ++ arch/riscv/kernel/tests/module_test/test_set8.S | 23 ++ arch/riscv/kernel/tests/module_test/test_sub16.S | 22 ++ arch/riscv/kernel/tests/module_test/test_sub32.S | 22 ++ arch/riscv/kernel/tests/module_test/test_sub6.S | 22 ++ arch/riscv/kernel/tests/module_test/test_sub64.S | 27 +++ arch/riscv/kernel/tests/module_test/test_sub8.S | 22 ++ arch/riscv/kernel/tests/module_test/test_uleb128.S | 20 ++ 18 files changed, 574 insertions(+), 26 deletions(-) --- base-commit: 82714078aee4ccbd6ee7579d5a21f8a72155d0fb change-id: 20230908-module_relocations-f63ced651bd7 -- - Charlie
