From: Stefano Stabellini <sstabellini@kernel.org>
To: Julien Grall <julien.grall@arm.com>
Cc: andre.przywara@arm.com, sstabellini@kernel.org,
steve.capper@arm.com, wei.chen@arm.com, xen-devel@lists.xen.org
Subject: Re: [RFC 08/16] xen/arm: arm64: Reserve a brk immediate to fault on purpose
Date: Mon, 9 May 2016 10:58:48 +0100 (BST) [thread overview]
Message-ID: <alpine.DEB.2.10.1605091058380.2363@sstabellini-ThinkPad-X260> (raw)
In-Reply-To: <1462466065-30212-9-git-send-email-julien.grall@arm.com>
On Thu, 5 May 2016, Julien Grall wrote:
> It may not possible to return a proper error when encoding an
> instruction. Instead, a handcrafted instruction will be returned.
>
> Also, provide the encoding for the faulting instruction.
>
> Signed-off-by: Julien Grall <julien.grall@arm.com>
Acked-by: Stefano Stabellini <sstabellini@kernel.org>
> xen/include/asm-arm/arm64/brk.h | 13 +++++++++++++
> 1 file changed, 13 insertions(+)
>
> diff --git a/xen/include/asm-arm/arm64/brk.h b/xen/include/asm-arm/arm64/brk.h
> index 7867b07..04442c4 100644
> --- a/xen/include/asm-arm/arm64/brk.h
> +++ b/xen/include/asm-arm/arm64/brk.h
> @@ -12,8 +12,21 @@
> /*
> * #imm16 values used for BRK instruction generation
> * 0x001: xen-mode BUG() and WARN() traps
> + * 0x002: for triggering a fault on purpose (reserved)
> */
> #define BRK_BUG_FRAME_IMM 1
> +#define BRK_FAULT_IMM 2
> +
> +/*
> + * BRK instruction encoding
> + * The #imm16 value should be placed at bits[20:5] within BRK ins
> + */
> +#define AARCH64_BREAK_MON 0xd4200000
> +
> +/*
> + * BRK instruction for provoking a fault on purpose
> + */
> +#define AARCH64_BREAK_FAULT (AARCH64_BREAK_MON | (BRK_FAULT_IMM << 5))
>
> #endif /* !__ASM_ARM_ARM64_BRK */
> /*
> --
> 1.9.1
>
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next prev parent reply other threads:[~2016-05-09 9:58 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-05 16:34 [RFC 00/16] xen/arm: Introduce alternative runtime patching for ARM64 Julien Grall
2016-05-05 16:34 ` [RFC 01/16] xen/arm: Makefile: Sort the entries alphabetically Julien Grall
2016-05-09 9:34 ` Stefano Stabellini
2016-05-05 16:34 ` [RFC 02/16] xen/arm: Include the header asm-arm/system.h in asm-arm/page.h Julien Grall
2016-05-09 9:34 ` Stefano Stabellini
2016-05-05 16:34 ` [RFC 03/16] xen/arm: Add macros to handle the MIDR Julien Grall
2016-05-09 9:37 ` Stefano Stabellini
2016-05-05 16:34 ` [RFC 04/16] xen/arm: arm64: Import flush_icache_range from Linux v4.6-rc3 Julien Grall
2016-05-09 9:40 ` Julien Grall
2016-05-05 16:34 ` [RFC 05/16] xen/arm: Add cpu_hwcap bitmap Julien Grall
2016-05-09 9:53 ` Stefano Stabellini
2016-05-09 10:02 ` Julien Grall
2016-05-05 16:34 ` [RFC 06/16] xen/arm64: Add an helper to invalidate all instruction caches Julien Grall
2016-05-09 9:50 ` Stefano Stabellini
2016-05-05 16:34 ` [RFC 07/16] xen/arm: arm64: Move the define BRK_BUG_FRAME into a separate header Julien Grall
2016-05-09 9:55 ` Stefano Stabellini
2016-05-05 16:34 ` [RFC 08/16] xen/arm: arm64: Reserve a brk immediate to fault on purpose Julien Grall
2016-05-09 9:58 ` Stefano Stabellini [this message]
2016-05-05 16:34 ` [RFC 09/16] xen/arm: arm64: Add helpers to decode and encode branch instructions Julien Grall
2016-05-09 10:05 ` Stefano Stabellini
2016-05-09 13:04 ` Julien Grall
2016-05-23 10:52 ` Julien Grall
2016-05-13 20:35 ` Konrad Rzeszutek Wilk
2016-05-14 10:49 ` Julien Grall
2016-05-05 16:34 ` [RFC 10/16] xen/arm: Introduce alternative runtime patching Julien Grall
2016-05-13 20:26 ` Konrad Rzeszutek Wilk
2016-05-14 18:02 ` Julien Grall
2016-05-21 15:09 ` Stefano Stabellini
2016-05-23 11:11 ` Julien Grall
2016-05-30 14:45 ` Stefano Stabellini
2016-05-30 16:42 ` Julien Grall
2016-05-31 9:21 ` Stefano Stabellini
2016-05-31 10:24 ` Julien Grall
2016-06-02 14:46 ` Konrad Rzeszutek Wilk
2016-06-02 15:04 ` Julien Grall
2016-06-02 15:14 ` Julien Grall
2016-06-06 14:17 ` Konrad Rzeszutek Wilk
2016-06-06 14:18 ` Julien Grall
2016-05-05 16:34 ` [RFC 11/16] xen/arm: Detect silicon revision and set cap bits accordingly Julien Grall
2016-05-13 20:37 ` Konrad Rzeszutek Wilk
2016-05-14 18:04 ` Julien Grall
2016-05-16 13:50 ` Konrad Rzeszutek Wilk
2016-05-16 13:54 ` Julien Grall
2016-05-05 16:34 ` [RFC 12/16] xen/arm: Document the errata implemented in Xen Julien Grall
2016-05-05 16:34 ` [RFC 13/16] xen/arm: arm64: Add Cortex-A53 cache errata workaround Julien Grall
2016-05-21 14:40 ` Stefano Stabellini
2016-05-23 13:39 ` Julien Grall
2016-05-05 16:34 ` [RFC 14/16] xen/arm: arm64: Add cortex-A57 erratum 832075 workaround Julien Grall
2016-05-05 16:34 ` [RFC 15/16] xen/arm: traps: Don't inject a fault if the translation VA -> IPA fails Julien Grall
2016-05-21 14:42 ` Stefano Stabellini
2016-05-21 14:51 ` Stefano Stabellini
2016-05-23 13:45 ` Julien Grall
2016-05-05 16:34 ` [RFC 16/16] xen/arm: arm64: Document Cortex-A57 erratum 834220 Julien Grall
2016-05-05 16:38 ` [RFC 00/16] xen/arm: Introduce alternative runtime patching for ARM64 Julien Grall
2016-05-11 2:28 ` Wei Chen
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