[PATCH 1/3] riscv: ptrace: add regs_set_register()

[Andrew Jones]

On Wed, Nov 13, 2024 at 09:17:01AM +0000, Ben Dooks wrote:
> Since we have regs_get_register() and we could use the set counterpart
> for things like fixing up traps, add regs_set_register() to set a pt_regs
> value from offset.
> 
> Signed-off-by: Ben Dooks <ben.dooks at codethink.co.uk>
> ---
>  arch/riscv/include/asm/ptrace.h | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
> 
> diff --git a/arch/riscv/include/asm/ptrace.h b/arch/riscv/include/asm/ptrace.h
> index b5b0adcc85c1..66fc1795141d 100644
> --- a/arch/riscv/include/asm/ptrace.h
> +++ b/arch/riscv/include/asm/ptrace.h
> @@ -143,6 +143,26 @@ static inline unsigned long regs_get_register(struct pt_regs *regs,
>  	return *(unsigned long *)((unsigned long)regs + offset);
>  }
>  
> +/**
> + * regs_set_register() - set register value from its offset

s/from/at/

> + * @regs:	pt_regs from which register value is gotten

s/gotten/set/

> + * @offset:	offset of the register.
> + * @to:		value to set register to

Can we name this 'value' instead of 'to'?

> + *
> + * regs_set_register sets the value @to to a register whose offset from @regs.
> + * The @offset is the offset of the register in struct pt_regs.
> + * If @offset is bigger than MAX_REG_OFFSET, this will ignore the write.
> + */
> +static inline void regs_set_register(struct pt_regs *regs,
> +				     unsigned int offset,
> +				     unsigned long to)
> +{
> +	if (unlikely(offset > MAX_REG_OFFSET))
> +		return;
> +
> +	*(unsigned long *)((unsigned long)regs + offset) = to;
> +}
> +
>  /**
>   * regs_get_kernel_argument() - get Nth function argument in kernel
>   * @regs:       pt_regs of that context
> -- 
> 2.37.2.352.g3c44437643
>

Thanks,
drew