On Fri, Aug 22, 2025 at 10:47 AM Jesse Taube <jesse@rivosinc.com> wrote:
>
> This patchset adds initial support for hardware breakpoints and
> watchpoints to the RISC-V architecture. The framework is built on
> top of perf subsystem and SBI debug trigger extension.
>
> Currently following features are not supported and are in works:
> - icount for single stepping
> - Virtualization of debug triggers
> - kernel space debug triggers
>
> The SBI debug trigger extension can be found at:
> https://github.com/riscv-non-isa/riscv-sbi-doc/blob/master/src/ext-debug-triggers.adoc
>
> The Sdtrig ISA is part of RISC-V debug specification which can be
> found at:
> https://github.com/riscv/riscv-debug-spec
>
> based off the original RFC by Himanshu Chauhan here:
> https://lore.kernel.org/lkml/20240222125059.13331-1-hchauhan@ventanamicro.com/
>
> Second RFC by Jesse Taube here:
> https://lore.kernel.org/lkml/20250722173829.984082-1-jesse@rivosinc.com/
>
> Himanshu Chauhan (2):
> riscv: Add SBI debug trigger extension and function ids
> riscv: Introduce support for hardware break/watchpoints
>
> Jesse Taube (6):
> riscv: Add insn.c, consolidate instruction decoding
> riscv: insn: Add get_insn_nofault
> riscv: hw_breakpoint: Use icount for single stepping
> riscv: ptrace: Add hw breakpoint support
> riscv: ptrace: Add hw breakpoint regset
> selftests: riscv: Add test for hardware breakpoints
>
> arch/riscv/Kconfig | 2 +
> arch/riscv/include/asm/bug.h | 12 -
> arch/riscv/include/asm/hw_breakpoint.h | 59 ++
> arch/riscv/include/asm/insn.h | 132 ++-
> arch/riscv/include/asm/kdebug.h | 3 +-
> arch/riscv/include/asm/processor.h | 4 +
> arch/riscv/include/asm/sbi.h | 33 +-
> arch/riscv/include/uapi/asm/ptrace.h | 9 +
> arch/riscv/kernel/Makefile | 2 +
> arch/riscv/kernel/hw_breakpoint.c | 763 ++++++++++++++++++
> arch/riscv/kernel/insn.c | 165 ++++
> arch/riscv/kernel/kgdb.c | 102 +--
> arch/riscv/kernel/probes/kprobes.c | 1 +
> arch/riscv/kernel/process.c | 4 +
> arch/riscv/kernel/ptrace.c | 169 ++++
> arch/riscv/kernel/traps.c | 11 +-
> arch/riscv/kernel/traps_misaligned.c | 93 +--
> include/uapi/linux/elf.h | 2 +
> tools/include/uapi/linux/elf.h | 1 +
> tools/perf/tests/tests.h | 3 +-
> tools/testing/selftests/riscv/Makefile | 2 +-
> .../selftests/riscv/breakpoints/.gitignore | 1 +
> .../selftests/riscv/breakpoints/Makefile | 13 +
> .../riscv/breakpoints/breakpoint_test.c | 246 ++++++
> 24 files changed, 1641 insertions(+), 191 deletions(-)
> create mode 100644 arch/riscv/include/asm/hw_breakpoint.h
> create mode 100644 arch/riscv/kernel/hw_breakpoint.c
> create mode 100644 arch/riscv/kernel/insn.c
> create mode 100644 tools/testing/selftests/riscv/breakpoints/.gitignore
> create mode 100644 tools/testing/selftests/riscv/breakpoints/Makefile
> create mode 100644 tools/testing/selftests/riscv/breakpoints/breakpoint_test.c
>
> --
> 2.43.0
>
Oops, this meant to be V2.
Thanks,
Jesse Taube