Re: [PATCH 0/5] target/riscv: support Debug 0.13 and 1.0

Ping


This is the series I talked about in our call last night/earlier today.

The v9 of the riscv-server-ref work was rebased on top of it, along with Chao's
sdext patches.  As soon as we get this queued I think I'll re-send Chao's
work next.


Cheers,
Daniel

On 8/5/2026 3:25 PM, Daniel Henrique Barboza wrote:
> Hi,
> 
> This short series adds support for Debug 0.13 and Debug 1.0.  The
> motivation is simple: we need Debug 1.0 to complete tue upstreaming of
> sdext, which is already fully reviewed and acked for awhile [1], and
> then proceed with the upstreaming of the RISC-V Server Ref board
> (currently on v8: [2]).
> 
> The work is based in section 1.2.1.2 "Incompatible Changes from 0.13 to
> 1.0" of the ratified 1.0 spec [3].  It ended being simpler than
> anticipated because we don't implement most of the registers/bits that
> are backwards incompatible.  I added doc changes to explain the
> rationale used.
> 
> After this series:
> 
> - 'ext_sdtrig' refers to Debug 1.0.  The legacy 'debug' flag refers to
>    Debug 0.13;
> - setting both flags enables Debug 1.0, i.e. 'ext_sdtrig' takes
>    precedence.
> 
> My hope is that this split will make it easier to to move away from
> Debug 0.13 in the future once there's no more demand for it.
> 
> Patches based on master.
> 
> [1] https://lore.kernel.org/qemu-devel/[email protected]/
> [2] https://lore.kernel.org/qemu-devel/[email protected]/
> [3] https://docs.riscv.org/reference/debug/v1.0/_attachments/riscv-debug-specification.pdf
> 
> Daniel Henrique Barboza (5):
>    target/riscv: split 'debug' and 'sdtrig' flags
>    target/riscv/tcg/debug.c: add Debug 1.0 'pending' bit
>    target/riscv/tcg/debug: adjust 'timing' bit for Debug 1.0
>    target/riscv/tcg/debug: set tinfo version if sdtrig enabled
>    docs/specs: add RISC-V CPU Debug support info
> 
>   docs/specs/index.rst              |  1 +
>   docs/specs/riscv-debug.rst        | 68 +++++++++++++++++++++++++++++++
>   target/riscv/cpu.c                | 21 +++++++---
>   target/riscv/cpu_cfg_fields.h.inc |  1 +
>   target/riscv/machine.c            |  2 +-
>   target/riscv/tcg/csr.c            |  2 +-
>   target/riscv/tcg/debug.c          | 51 +++++++++++++++++++++--
>   target/riscv/tcg/debug.h          |  6 ++-
>   target/riscv/tcg/tcg-cpu.c        |  3 +-
>   9 files changed, 142 insertions(+), 13 deletions(-)
>   create mode 100644 docs/specs/riscv-debug.rst
>