linux-kernel - Re: [PATCH 12/19] csky: Debug and Ptrace GDB

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Date:   Mon, 26 Mar 2018 15:06:21 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Guo Ren <ren_guo@...ky.com>
Cc:     linux-arch <linux-arch@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Jason Cooper <jason@...edaemon.net>,
        c-sky_gcc_upstream@...ky.com, gnu-csky@...tor.com,
        thomas.petazzoni@...tlin.com, wbx@...ibc-ng.org
Subject: Re: [PATCH 12/19] csky: Debug and Ptrace GDB

On Sun, Mar 18, 2018 at 8:51 PM, Guo Ren <ren_guo@...ky.com> wrote:
> Signed-off-by: Guo Ren <ren_guo@...ky.com>

> + */
> +long arch_ptrace(struct task_struct *child, long request, unsigned long addr,
> +               unsigned long data)
> +{
> +       unsigned long tmp = 0, ret = 0;
> +       int i;
> +
> +       switch (request) {
> +               /* read the word at location addr in the USER area. */
> +       case PTRACE_PEEKUSR:

> +
> +       case PTRACE_POKEUSR:  /* write the word at location addr in the USER area */

> +       case PTRACE_GETREGS:    /* Get all gp regs from the child. */

> +       case PTRACE_SETREGS:    /* Set all gp regs in the child. */
> +               for (i = 0; i <= CSKY_GREG_NUM; i++) {
> +                       ret = get_user(tmp, (unsigned long *)data);


I think all of these should use the regset code like arch/riscv/kernel/ptrace.c
does.

       Arnd