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

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Date:	Tue, 3 Aug 2010 21:54:39 +0100 (BST)
From:	"Maciej W. Rozycki" <macro@...ux-mips.org>
To:	David Daney <ddaney@...iumnetworks.com>
cc:	linux-mips@...ux-mips.org, ralf@...ux-mips.org, ananth@...ibm.com,
	anil.s.keshavamurthy@...el.com, davem@...emloft.net,
	masami.hiramatsu.pt@...achi.com, linux-kernel@...r.kernel.org,
	hschauhan@...ltrace.org
Subject: Re: [PATCH 2/5] MIPS: Add instrunction format for BREAK and
 SYSCALL

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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