linux-kernel - Re: [RFC Patch v1 33/55] ARC: ptrace support

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Date:	Mon, 12 Nov 2012 13:51:05 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	Vineet.Gupta1@...opsys.com
Cc:	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	tglx@...utronix.de
Subject: Re: [RFC Patch v1 33/55] ARC: ptrace support

On Monday 12 November 2012, Vineet.Gupta1@...opsys.com wrote:
> +       case PTRACE_PEEKUSR:
> +               pos = addr;     /* offset in struct user_regs_struct */
> +               count = 4;      /* 1 register only */
> +               u_addr = (unsigned int __user *)data;
> +               kbuf = NULL;
> +               ret = genregs_get(child, NULL, pos, count, kbuf, u_addr);
> +               break;
> +
> +       case PTRACE_POKEUSR:
> +               pos = addr;     /* offset in struct user_regs_struct */
> +               count = 4;      /* 1 register only */
> +
> +               /* Ideally @data would have abeen a user space buffer, from
> +                * where, we do a copy_from_user.
> +                * However this request only involves one word, which courtesy
> +                * our ABI can be passed in a reg.
> +                * regset interface however expects some buffer to copyin from
> +                */
> +               kbuf = &data;
> +               u_addr = NULL;
> +
> +               ret = genregs_set(child, NULL, pos, count, kbuf, u_addr);
> +               break;
> +

I think these should be moved into regsets, as we have done for all
other new architectures. Your arch_ptrace then becomes a trivial wrapper
around ptrace_request.

	Arnd
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