On Wed, Jan 15, 2025 at 07:13:26PM +0800, Celeste Liu wrote:
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@gmail.com/
Signed-off-by: Celeste Liu uwu@coelacanthus.name
Changes in v6:
- Fix obsolute comment.
- Copy include/linux/stddef.h to tools/include to use offsetofend in selftests.
- Link to v5: https://lore.kernel.org/r/20250115-riscv-new-regset-v5-0-d0e6ec031a23@coelac...
Changes in v5:
- Fix wrong usage in selftests.
- Link to v4: https://lore.kernel.org/r/20241226-riscv-new-regset-v4-0-4496a29d0436@coelac...
Changes in v4:
- Fix a copy paste error in selftest. (Forget to commit...)
- Link to v3: https://lore.kernel.org/r/20241226-riscv-new-regset-v3-0-f5b96465826b@coelac...
Changes in v3:
- Use return 0 directly for readability.
- Fix test for modify a0.
- Add Fixes: tag
- Remove useless Cc: stable.
- Selftest will check both a0 and orig_a0, but depends on the correctness of PTRACE_GET_SYSCALL_INFO.
- Link to v2: https://lore.kernel.org/r/20241203-riscv-new-regset-v2-0-d37da8c0cba6@coelac...
Changes in v2:
- Fix integer width.
- Add selftest.
- Link to v1: https://lore.kernel.org/r/20241201-riscv-new-regset-v1-1-c83c58abcc7b@coelac...
Celeste Liu (3): riscv/ptrace: add new regset to access original a0 register tools: copy include/linux/stddef.h to tools/include riscv: selftests: Add a ptrace test to verify a0 and orig_a0 access
arch/riscv/kernel/ptrace.c | 32 +++++ include/uapi/linux/elf.h | 1 + tools/include/linux/stddef.h | 85 ++++++++++++ tools/include/uapi/linux/stddef.h | 6 +- tools/testing/selftests/riscv/abi/.gitignore | 1 + tools/testing/selftests/riscv/abi/Makefile | 6 +- tools/testing/selftests/riscv/abi/ptrace.c | 193 +++++++++++++++++++++++++++ 7 files changed, 319 insertions(+), 5 deletions(-)
base-commit: 0e287d31b62bb53ad81d5e59778384a40f8b6f56 change-id: 20241201-riscv-new-regset-d529b952ad0d
Best regards,
Celeste Liu uwu@coelacanthus.name
There is also this series that looks like it will solve this problem by providing an architecture agnostic way of changing syscall args with PTRACE_SET_SYSCALL_INFO [1].
- Charlie
[1] https://lore.kernel.org/lkml/20250113170925.GA392@altlinux.org/