linux-kernel - Re: [PATCH v2 02/29] nios2: Kernel booting and initialization

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Message-ID: <20140730091215.GE10301@distanz.ch>
Date:	Wed, 30 Jul 2014 11:12:16 +0200
From:	Tobias Klauser <tklauser@...tanz.ch>
To:	Ley Foon Tan <lftan@...era.com>
Cc:	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org, lftan.linux@...il.com,
	cltang@...esourcery.com
Subject: Re: [PATCH v2 02/29] nios2: Kernel booting and initialization

On 2014-07-15 at 10:45:29 +0200, Ley Foon Tan <lftan@...era.com> wrote:
> This patch adds the kernel booting and the initial setup code.
> 
> Signed-off-by: Ley Foon Tan <lftan@...era.com>
> ---
>  arch/nios2/include/asm/entry.h | 152 ++++++++++++++++++++++++++++
>  arch/nios2/include/asm/setup.h |  38 +++++++
>  arch/nios2/kernel/head.S       | 175 ++++++++++++++++++++++++++++++++
>  arch/nios2/kernel/setup.c      | 222 +++++++++++++++++++++++++++++++++++++++++
>  4 files changed, 587 insertions(+)
>  create mode 100644 arch/nios2/include/asm/entry.h
>  create mode 100644 arch/nios2/include/asm/setup.h
>  create mode 100644 arch/nios2/kernel/head.S
>  create mode 100644 arch/nios2/kernel/setup.c
> 
> diff --git a/arch/nios2/include/asm/entry.h b/arch/nios2/include/asm/entry.h
> new file mode 100644
> index 0000000..8b7cddd
> --- /dev/null
> +++ b/arch/nios2/include/asm/entry.h
> @@ -0,0 +1,152 @@

[...]

> +/*
> + * Stack layout in 'ret_from_exception':
> + *
> + * This allows access to the syscall arguments in registers r4-r8
> + *
> + *	 0(sp) - r8
> + *	 4(sp) - r9
> + *	 8(sp) - r10
> + *	 C(sp) - r11
> + *	10(sp) - r12
> + *	14(sp) - r13
> + *	18(sp) - r14
> + *	1C(sp) - r15
> + *	20(sp) - r1
> + *	24(sp) - r2
> + *	28(sp) - r3
> + *	2C(sp) - r4
> + *	30(sp) - r5
> + *	34(sp) - r6
> + *	38(sp) - r7
> + *	3C(sp) - orig_r2
> + *	40(sp) - ra
> + *	44(sp) - fp
> + *	48(sp) - sp
> + *	4C(sp) - gp
> + *	50(sp) - estatus
> + *	54(sp) - status_extension (NOMMU only)
> + *	58(sp) - ea
> + */

status_extension no longer exists and orig_r7 is missing in the list
above. Since this corresponds to the order of struct pt_regs anyhow,
this comment seems rather pointless to me, so you might as well want to
remove it altogether.
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