Re: [PATCH v2 8/8] alpha: enable GENERIC_ENTRY and GENERIC_IRQ_ENTRY

[Matt Turner]

On Fri, May 29, 2026 at 10:23 AM Magnus Lindholm <linmag7@xxxxxxxxx> wrote:
> diff --git a/arch/alpha/kernel/ptrace.c b/arch/alpha/kernel/ptrace.c
> index 69eb337347df..d4a8937985be 100644
> --- a/arch/alpha/kernel/ptrace.c
> +++ b/arch/alpha/kernel/ptrace.c
> @@ -134,18 +134,51 @@ get_reg_addr(struct task_struct * task, unsigned long regno)
>  /*
>   * Get contents of register REGNO in task TASK.
>   */
> -static unsigned long
> -get_reg(struct task_struct * task, unsigned long regno)
> +
> +static bool
> +valid_regno(unsigned long regno)
>  {
> -       /* Special hack for fpcr -- combine hardware and software bits.  */
> +       switch (regno) {
> +       case 0 ... 31:

POKEUSR implements the floating-point registers, 32-62 (63 is FPCR).
We should implement them here as well for symmetry.

> +       case 63:

I think we need to implement 64 (program counter). Without that, I
think single-stepping will be broken?