Messages in this thread | | | Date | Fri, 16 Apr 2010 17:03:04 +0200 | From | Michal Simek <> | Subject | Re: [microblaze-uclinux] Re: [PATCH 1/2] microblaze: add stack unwinder |
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Steven J. Magnani wrote: > On Fri, 2010-04-16 at 10:32 +0200, Michal Simek wrote: >> Please apply this patch and do the same testing as I did. >> >> diff --git a/arch/microblaze/kernel/reset.c b/arch/microblaze/kernel/reset.c >> index a1721a3..76f6587 100644 >> --- a/arch/microblaze/kernel/reset.c >> +++ b/arch/microblaze/kernel/reset.c >> @@ -112,8 +112,8 @@ void of_platform_reset_gpio_probe(void) >> void machine_restart(char *cmd) >> { >> printk(KERN_NOTICE "Machine restart...\n"); >> + machine_shutdown(); >> gpio_system_reset(); >> - dump_stack(); >> while (1) >> ; >> } >> @@ -121,6 +121,7 @@ void machine_restart(char *cmd) >> void machine_shutdown(void) >> { >> printk(KERN_NOTICE "Machine shutdown...\n"); >> + dump_stack(); >> while (1) >> ; >> } > > I get this: > > Call Trace: > [<20003008>] microblaze_unwind+0x68/0x94 > [<20002c24>] show_stack+0x134/0x174 > [<20002c80>] dump_stack+0x1c/0x3c > [<20001d84>] machine_shutdown+0x30/0x40 > [<20001dc0>] machine_restart+0x2c/0x48 > [<2002a540>] kernel_restart+0x5c/0x80 > [<2002a6b8>] sys_reboot+0x11c/0x218 > SYSCALL > [<2d5c0248>] PID 118 [reboot] > > Is your problem on a MMU or noMMU system?
Interesting. It was noMMU system.
> > If the unwinder stops early, it found a return address outside the > kernel text, or couldn't find the addik that creates a stack frame - but > there's not enough information here to tell what happened. In your case > the backtrace goes off the rails before getting to the frame for > dump_stack(), which is where the stack dump begins. We'd need to see the > 21 words preceding the dump (show_stack's frame is 13 words, and > microblaze_unwind's is 8) to know why. > > Can you uncomment the #define DEBUG in unwind.c and try it again?
will do next week and let you know.
Thanks, Michal
> > Thanks, > ------------------------------------------------------------------------ > Steven J. Magnani "I claim this network for MARS! > www.digidescorp.com Earthling, return my space modulator!" > > #include <standard.disclaimer> > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/
-- Michal Simek, Ing. (M.Eng) w: www.monstr.eu p: +42-0-721842854 Maintainer of Linux kernel 2.6 Microblaze Linux - http://www.monstr.eu/fdt/ Microblaze U-BOOT custodian
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