riscv: ptrace: return ENODATA for inactive vector extension

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Currently, ptrace returns EINVAL when the vector extension is supported
but not yet activated for the traced process. This error code is not
always appropriate since the ptrace arguments may be valid.

Debug tools like gdbserver expect ENODATA when the requested register
set is not active, e.g. see [1]. This expectation seems to be more
appropriate, so modify the vector ptrace implementation to return:
- EINVAL when V extension is not supported
- ENODATA when V extension is supported but not active

[1] 637f25e886/gdbserver/linux-low.cc (L5020)

Signed-off-by: Ilya Mamay <mmamayka01@gmail.com>
Signed-off-by: Sergey Matyukevich <geomatsi@gmail.com>
Reviewed-by: Andy Chiu <andybnac@gmail.com>
Tested-by: Andy Chiu <andybnac@gmail.com>
Link: https://patch.msgid.link/20251214163537.1054292-2-geomatsi@gmail.com
Signed-off-by: Paul Walmsley <pjw@kernel.org>

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Ilya Mamay 2026-01-25 21:09:56 -07:00 • committed by Paul Walmsley

parent d30c1683aa

commit 8cdb04bd06

1 changed files with 8 additions and 2 deletions

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arch/riscv/kernel/ptrace.c

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