The orig_a0 is missing in struct user_regs_struct of riscv, and there is no way to add it without breaking UAPI. (See Link tag below) Like NT_ARM_SYSTEM_CALL do, we add a new regset name NT_RISCV_ORIG_A0 to access original a0 register from userspace via ptrace API. Link: https://lore.kernel.org/all/59505464-c84a-403d-972f-d4b2055eeaac@xxxxxxxxx/ Signed-off-by: Celeste Liu <uwu@xxxxxxxxxxxxxxxxx> --- Changes in v2: - Fix integer width. - Add selftest. - Link to v1: https://lore.kernel.org/r/20241201-riscv-new-regset-v1-1-c83c58abcc7b@xxxxxxxxxxxxxxxxx --- Celeste Liu (1): riscv/ptrace: add new regset to access original a0 register Charlie Jenkins (1): riscv: selftests: Add a ptrace test to verify syscall parameter modification arch/riscv/kernel/ptrace.c | 32 +++++++ include/uapi/linux/elf.h | 1 + tools/testing/selftests/riscv/abi/.gitignore | 1 + tools/testing/selftests/riscv/abi/Makefile | 5 +- tools/testing/selftests/riscv/abi/ptrace.c | 134 +++++++++++++++++++++++++++ 5 files changed, 172 insertions(+), 1 deletion(-) --- base-commit: 0e287d31b62bb53ad81d5e59778384a40f8b6f56 change-id: 20241201-riscv-new-regset-d529b952ad0d Best regards, -- Celeste Liu <uwu@xxxxxxxxxxxxxxxxx>
