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Re: [PATCH 2/5] MIPS: Add instrunction format for BREAK and SYSCALL

To: David Daney <ddaney@caviumnetworks.com>
Subject: Re: [PATCH 2/5] MIPS: Add instrunction format for BREAK and SYSCALL
From: "Maciej W. Rozycki" <macro@linux-mips.org>
Date: Tue, 3 Aug 2010 21:54:39 +0100 (BST)
Cc: linux-mips@linux-mips.org, ralf@linux-mips.org, ananth@in.ibm.com, anil.s.keshavamurthy@intel.com, davem@davemloft.net, masami.hiramatsu.pt@hitachi.com, linux-kernel@vger.kernel.org, hschauhan@nulltrace.org
In-reply-to: <1280859742-26364-3-git-send-email-ddaney@caviumnetworks.com>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <1280859742-26364-1-git-send-email-ddaney@caviumnetworks.com> <1280859742-26364-3-git-send-email-ddaney@caviumnetworks.com>
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On Tue, 3 Aug 2010, David Daney wrote:

> diff --git a/arch/mips/include/asm/inst.h b/arch/mips/include/asm/inst.h
> index 6489f00..444ff71 100644
> --- a/arch/mips/include/asm/inst.h
> +++ b/arch/mips/include/asm/inst.h
> @@ -247,6 +247,12 @@ struct ma_format {       /* FPU multipy and add format 
> (MIPS IV) */
>       unsigned int fmt : 2;
>  };
>  
> +struct b_format { /* BREAK and SYSCALL */
> +     unsigned int opcode:6;
> +     unsigned int code:20;
> +     unsigned int func:6;
> +};
> +
>  #elif defined(__MIPSEL__)
>  
>  struct j_format {    /* Jump format */

 Please note the code field of the BREAK instruction is by toolchain 
convention (bug-compatibility with the original MIPS assembler or 
suchlike) treated as a pair of swapped 10-bit fields -- you may want to 
double-check consistency of interpretation with usage elsewhere.

  Maciej

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