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Message-ID: <20100103160313.GA21156@n2100.arm.linux.org.uk>
Date:	Sun, 3 Jan 2010 16:03:13 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Hui Zhu <teawater@...il.com>
Cc:	saeed bishara <saeed.bishara@...il.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Nicolas Pitre <nico@...xnic.net>,
	Ralf Baechle <ralf@...ux-mips.org>,
	David Daney <ddaney@...iumnetworks.com>,
	Tomaso Paoletti <tpaoletti@...iumnetworks.com>,
	Chris Dearman <chris@...s.com>,
	Paul Gortmaker <Paul.Gortmaker@...driver.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Frederic Weisbecker <fweisbec@...il.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Brian Gerst <brgerst@...il.com>, Tejun Heo <tj@...nel.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-mips@...ux-mips.org, Coly Li <coly.li@...e.de>
Subject: Re: [PATCH] stack2core: show stack message and convert it to core
	file when kernel die

On Sun, Jan 03, 2010 at 11:05:05PM +0800, Hui Zhu wrote:
> Hello,
> 
> For, when the kernel die, the user will get some message like:
> PC is at kernel_init+0xd4/0x104
> LR is at _atomic_dec_and_lock+0x48/0x6c
> pc : [<c0008470>]    lr : [<c01911f8>]    psr: 60000013
> sp : c7823fd8  ip : c7823f48  fp : c7823ff4
> Stack: (0xc7823fd8 to 0xc7824000)
> 3fc0:                                                       00000000 00000001
> Backtrace:
> [<c000839c>] (kernel_init+0x0/0x104) from [<c0042660>] (do_exit+0x0/0x880)
> This backtrace have some wrong message sometime and cannot get any
> val. Of course, kdump can get more message.  But it need do some a lot
> of other config.

If you have frame pointers enabled, the backtrace is _never_ wrong.
It only goes wrong if you disable frame pointers, at which point the
unwind tables have to be used.

> When kernel die, show some message:
> S2C:elf_class=1
> S2C:elf_data=1
> S2C:elf_arch=40
> S2C:elf_osabi=0
> S2C:r0=0x00000000;
> S2C:r1=0xc7822000;
> S2C:r2=0xc7823f48;
> S2C:r3=0x00000003;
> S2C:r4=0x00000000;
> S2C:r5=0x00000000;
> S2C:r6=0x00000000;
> S2C:r7=0x00000000;
> S2C:r8=0x00000000;
> S2C:r9=0x00000000;
> S2C:r10=0x00000000;
> S2C:fp=0xc7823ff4;
> S2C:ip=0xc7823f48;
> S2C:sp=0xc7823fd8;
> S2C:lr=0xc01911f8;
> S2C:pc=0xc0008470;
> S2C:cpsr=0x60000013;
> S2C:ORIG_r0=0xffffffff;
> 
> S2C:stack=0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
> S2C:stack=0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
> S2C:stack=0x00, 0x00, 0x00, 0x00, 0xf8, 0x3f, 0x82, 0xc7,
> S2C:stack=0x60, 0x26, 0x04, 0xc0, 0xa8, 0x83, 0x00, 0xc0,
> S2C:stack=0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

Please don't invent yet another way of dumping stuff out of the kernel.
What we already have is sufficient for your needs - there's no reason
what so ever to change it to achieve your goals.  We already dump the
registers and the stack, which seems to be all that you require.
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