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: Mon, 13 Jul 2015 17:51:51 +0100 [thread overview]
Message-ID: <20150713165151.GC10670@e103592.cambridge.arm.com> (raw)
In-Reply-To: <20150713164315.GC22840@leverpostej>
On Mon, Jul 13, 2015 at 05:43:15PM +0100, Mark Rutland wrote:
> Hi,
>
> 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.
[...]
> FWIW I've given this a spin and it seems to work, so:
>
> Tested-by: Mark Rutland <mark.rutland@arm.com>
Thanks for testing.
> I have one concern with this below.
>
> > +#ifndef _ARCH_ARM64_ASM_BUG_H
> > +#define _ARCH_ARM64_ASM_BUG_H
> > +
> > +#include <asm/debug-monitors.h>
> > +
> > +#ifdef CONFIG_GENERIC_BUG
> > +#define HAVE_ARCH_BUG
> > +
> > +#ifdef CONFIG_DEBUG_BUGVERBOSE
> > +#define _BUGVERBOSE_LOCATION(file, line) __BUGVERBOSE_LOCATION(file, line)
> > +#define __BUGVERBOSE_LOCATION(file, line) \
> > + ".pushsection .rodata.str,\"aMS\", at progbits,1\n" \
> > + "2: .string \"" file "\"\n\t" \
> > + ".popsection\n\t" \
> > + \
> > + ".long 2b - 0b\n\t" \
> > + ".short " #line "\n\t"
> > +#else
> > +#define _BUGVERBOSE_LOCATION(file, line)
> > +#endif
>
> Given the reliance on the labels in the caller, I think it might make
Not sure what you mean here, can you elaborate?
> more sense to fold this into __BUG_FLAGS, and just have an #ifdef in the
> middle.
>
> That would also mean passing file and line to the macro for the general
> case, like on arch/arm (even if !CONFIG_DEBUG_BUGVERBOSE), and moving
> the double-indirection of those out to the caller.
I'll take a look -- it is probably more complex at present than it needs
to be.
[...]
Cheers
---Dave
next prev parent reply other threads:[~2015-07-13 16:51 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 [this message]
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
2015-07-13 13:25 ` [PATCH v2 10/10] arm64/BUG: Show explicit backtrace for WARNs Dave Martin
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