From: Dave.Martin@arm.com (Dave Martin)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 09/10] arm64/BUG: Use BRK instruction for generic BUG traps
Date: Tue, 14 Jul 2015 17:55:13 +0100 [thread overview]
Message-ID: <20150714165513.GH10670@e103592.cambridge.arm.com> (raw)
In-Reply-To: <20150714161103.GI13555@e104818-lin.cambridge.arm.com>
On Tue, Jul 14, 2015 at 05:11:04PM +0100, Catalin Marinas wrote:
> On Mon, Jul 13, 2015 at 02:25:56PM +0100, Dave P Martin wrote:
> > Currently, the minimal default BUG() implementation from asm-
> > generic is used for arm64.
> >
> > This patch uses the BRK software breakpoint instruction to generate
> > a trap instead, similarly to most other arches, with the generic
> > BUG code generating the dmesg boilerplate.
> >
> > This allows bug metadata to be moved to a separate table and
> > reduces the amount of inline code at BUG and WARN sites. This also
> > avoids clobbering any registers before they can be dumped.
> >
> > To mitigate the size of the bug table further, this patch makes
> > use of the existing infrastructure for encoding addresses within
> > the bug table as 32-bit offsets instead of absolute pointers.
> > (Note that this limits the kernel size to 2GB.)
> >
> > Traps are registered at arch_initcall time for aarch64, but BUG
> > has minimal real dependencies and it is desirable to be able to
> > generate bug splats as early as possible. This patch redirects
> > all debug exceptions caused by BRK directly to bug_handler() until
> > the full debug exception support has been initialised.
> >
> > Signed-off-by: Dave Martin <Dave.Martin@arm.com>
>
> The patch looks fine to me and since I gave you feedback on it before,
> you can add:
>
> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
>
> For the rest of the series, feel free to add:
>
> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
OK, thanks.
I have a final respin to do, but most stuff won't change -- I'll flag
the differences.
Cheers
---Dave
next prev parent reply other threads:[~2015-07-14 16:55 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-13 13:25 [PATCH v2 00/10] arm64: Use BRK instruction for generic BUG traps Dave Martin
2015-07-13 13:25 ` [PATCH v2 01/10] arm64/debug: Eliminate magic number for size of BRK instruction Dave Martin
2015-07-13 14:47 ` Mark Rutland
2015-07-13 13:25 ` [PATCH v2 02/10] arm64/debug: Mask off all reserved bits from generated ESR values Dave Martin
2015-07-13 14:14 ` Mark Rutland
2015-07-13 14:22 ` Dave Martin
2015-07-13 13:25 ` [PATCH v2 03/10] arm64: esr.h type fixes and cleanup Dave Martin
2015-07-14 15:54 ` Mark Rutland
2015-07-14 16:53 ` Dave Martin
2015-07-13 13:25 ` [PATCH v2 04/10] arm64/debug: Eliminate magic number from ESR template definition Dave Martin
2015-07-13 14:16 ` Mark Rutland
2015-07-13 13:25 ` [PATCH v2 05/10] arm64/debug: More consistent naming for the BRK ESR template macro Dave Martin
2015-07-13 14:19 ` Mark Rutland
2015-07-13 13:25 ` [PATCH v2 06/10] arm64/debug: Move BRK ESR template macro into <asm/esr.h> Dave Martin
2015-07-13 14:18 ` Mark Rutland
2015-07-13 13:25 ` [PATCH v2 07/10] arm64/debug: Simplify BRK insn opcode declarations Dave Martin
2015-07-13 14:38 ` Mark Rutland
2015-07-13 13:25 ` [PATCH v2 08/10] arm64/debug: Add missing #include Dave Martin
2015-07-13 14:34 ` Mark Rutland
2015-07-13 14:44 ` Dave Martin
2015-07-13 14:45 ` Mark Rutland
2015-07-13 13:25 ` [PATCH v2 09/10] arm64/BUG: Use BRK instruction for generic BUG traps Dave Martin
2015-07-13 16:43 ` Mark Rutland
2015-07-13 16:51 ` Dave Martin
2015-07-13 16:56 ` Mark Rutland
2015-07-13 17:05 ` Dave P Martin
2015-07-14 10:20 ` Dave Martin
2015-07-14 11:09 ` Mark Rutland
2015-07-14 11:34 ` Dave Martin
2015-07-14 15:51 ` Mark Rutland
2015-07-14 16:53 ` Dave Martin
2015-07-14 16:11 ` Catalin Marinas
2015-07-14 16:55 ` Dave Martin [this message]
2015-07-13 13:25 ` [PATCH v2 10/10] arm64/BUG: Show explicit backtrace for WARNs Dave Martin
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