Re: [PATCH] ARM: fix alignement of __bug_table section entries

From	Robert Jarzmik <robert.jarzmik@free.fr>
Newsgroups	linux.kernel
Subject	Re: [PATCH] ARM: fix alignement of __bug_table section entries
Date	2015-09-08 23:00 +0200
Message-ID	<q6y9I-76u-9@gated-at.bofh.it> (permalink)
References	(6 earlier) <q5O6S-8ne-7@gated-at.bofh.it> <q5PPk-2pH-7@gated-at.bofh.it> <q5S0N-5r9-9@gated-at.bofh.it> <q6uz8-26l-21@gated-at.bofh.it> <q6xnl-6ba-23@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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Russell King - ARM Linux <linux@arm.linux.org.uk> writes:

> What should happen is:
Thanks very much for the explanation, hopefully I have enough material to fly on
my own now.

> Now, when you get the fault inside arm_copy_from_user(), you can
> print the DACR value saved at the time the fault was generated by
> printing the word above struct pt_regs on the stack - add to
> arch/arm/mm/fault.c:do_DataAbort():
>
> if (addr == 0xbf00202c) printk("DACR=0x%08x\n", *(u32 *)(regs + 1));
>
> before the "if (!inf->fn(addr, fsr & ~FSR_LNX_PF, regs))" line.
> That'll tell us what the DACR register was when we saved it.
>
> If it isn't 0x75, then the next part of the puzzle is going to be
> working out why it isn't.
It's 0x55. I'll track down how this happens, there are not that many places
where DACR is touched, and I'm in a very controlled environement, so I can
cunningly place JTAG breakpoints and watch DACR.

I'll report once I have a better idea what is happening, that might take me a
couple of days given that most of my workforce is available on weekends only.

Thanks again for the free lesson.

-- 
Robert
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Thread

Re: [PATCH] ARM: fix alignement of __bug_table section entries Robert Jarzmik <robert.jarzmik@free.fr> - 2015-09-08 19:10 +0200
  Re: [PATCH] ARM: fix alignement of __bug_table section entries Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-09-08 22:10 +0200
    Re: [PATCH] ARM: fix alignement of __bug_table section entries Robert Jarzmik <robert.jarzmik@free.fr> - 2015-09-08 23:00 +0200
    Re: [PATCH] ARM: fix alignement of __bug_table section entries Robert Jarzmik <robert.jarzmik@free.fr> - 2015-09-10 01:20 +0200
      Re: [PATCH] ARM: fix alignement of __bug_table section entries Robert Jarzmik <robert.jarzmik@free.fr> - 2015-09-10 21:10 +0200
        Re: [PATCH] ARM: fix alignement of __bug_table section entries Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-09-10 21:20 +0200
          Re: [PATCH] ARM: fix alignement of __bug_table section entries Robert Jarzmik <robert.jarzmik@free.fr> - 2015-09-10 23:00 +0200
            Re: [PATCH] ARM: fix alignement of __bug_table section entries Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-09-11 12:00 +0200
              [PATCH 2/2] ARM: domains: add memory dependencies to  get_domain/set_domain Russell King <rmk+kernel@arm.linux.org.uk> - 2015-09-11 12:00 +0200
                Re: [PATCH 2/2] ARM: domains: add memory dependencies to get_domain/set_domain Robert Jarzmik <robert.jarzmik@free.fr> - 2015-09-11 17:10 +0200
                Re: [PATCH 2/2] ARM: domains: add memory dependencies to  get_domain/set_domain Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-09-11 17:20 +0200
                Re: [PATCH 2/2] ARM: domains: add memory dependencies to get_domain/set_domain Robert Jarzmik <robert.jarzmik@free.fr> - 2015-09-11 17:50 +0200
              [PATCH 1/2] ARM: domains: thread_info.h no longer needs asm/domains.h Russell King <rmk+kernel@arm.linux.org.uk> - 2015-09-11 12:00 +0200

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