linux-kernel - Re: [RESEND][ PATCH -tip -v9 1/7] x86: instruction decoder API

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Date:	Fri, 12 Jun 2009 15:50:57 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Masami Hiramatsu <mhiramat@...hat.com>
CC:	Ingo Molnar <mingo@...e.hu>, Steven Rostedt <rostedt@...dmis.org>,
	lkml <linux-kernel@...r.kernel.org>,
	systemtap <systemtap@...rces.redhat.com>,
	kvm <kvm@...r.kernel.org>,
	DLE <dle-develop@...ts.sourceforge.net>,
	Jim Keniston <jkenisto@...ibm.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Vegard Nossum <vegard.nossum@...il.com>,
	Avi Kivity <avi@...hat.com>,
	PrzemysławPawełczyk <przemyslaw@...elczyk.it>
Subject: Re: [RESEND][ PATCH -tip -v9 1/7] x86: instruction decoder API

Masami Hiramatsu wrote:
> Add x86 instruction decoder to arch-specific libraries. This decoder
> can decode x86 instructions used in kernel into prefix, opcode, modrm,
> sib, displacement and immediates. This can also show the length of
> instructions.
> 
> This version introduces instruction attributes for decoding instructions.
> The instruction attribute tables are generated from the opcode map file
> (x86-opcode-map.txt) by the generator script(gen-insn-attr-x86.awk).
> 
> Currently, the opcode maps are based on opcode maps in Intel(R) 64 and
> IA-32 Architectures Software Developers Manual Vol.2: Appendix.A,
> and consist of below two types of opcode tables.
> 
> 1-byte/2-bytes/3-bytes opcodes, which has 256 elements, are
> written as below;
> 
>  Table: table-name
>  Referrer: escaped-name
>  opcode: mnemonic|GrpXXX [operand1[,operand2...]] [(extra1)[,(extra2)...] [| 2nd-mnemonic ...]
>   (or)
>  opcode: escape # escaped-name
>  EndTable
> 
> Group opcodes, which has 8 elements, are written as below;
> 
>  GrpTable: GrpXXX
>  reg:  mnemonic [operand1[,operand2...]] [(extra1)[,(extra2)...] [| 2nd-mnemonic ...]
>  EndTable
> 
> These opcode maps do NOT include most of SSE and FP opcodes, because
> those opcodes are not used in the kernel.
> 
> Signed-off-by: Masami Hiramatsu <mhiramat@...hat.com>
> Signed-off-by: Jim Keniston <jkenisto@...ibm.com>
> Cc: H. Peter Anvin <hpa@...or.com>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: Ananth N Mavinakayanahalli <ananth@...ibm.com>
> Cc: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
> Cc: Ingo Molnar <mingo@...e.hu>
> Cc: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Andi Kleen <ak@...ux.intel.com>
> Cc: Vegard Nossum <vegard.nossum@...il.com>
> Cc: Avi Kivity <avi@...hat.com>
> Cc: Przemysław Pawełczyk <przemyslaw@...elczyk.it>
> ---
> 

The decoder looks good by now.

Acked-by: H. Peter Anvin <hpa@...or.com>

	-hpa
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