linux-kernel - Re: [PATCH v4 04/16] ARM: move generic thumb instruction parsing code to new files for use by other feature

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Date:	Wed, 15 Jan 2014 11:41:19 -0500
From:	David Long <dave.long@...aro.org>
To:	"Jon Medhurst (Tixy)" <tixy@...aro.org>
CC:	linux-arm-kernel@...ts.infradead.org,
	Russell King <linux@....linux.org.uk>,
	Rabin Vincent <rabin@....in>, Oleg Nesterov <oleg@...hat.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...hat.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
	davem@...emloft.net, Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 04/16] ARM: move generic thumb instruction parsing
 code to new files for use by other feature

On 12/20/13 07:46, Jon Medhurst (Tixy) wrote:
> On Sun, 2013-12-15 at 23:08 -0500, David Long wrote:
>> From: "David A. Long" <dave.long@...aro.org>
>>
>> Move the thumb version of the kprobes instruction parsing code into more generic
>> files from where it can be used by uprobes and possibly other subsystems. The
>> symbol names will be made more generic in a subsequent part of this patchset.
>>
>> Signed-off-by: David A. Long <dave.long@...aro.org>
>> ---
>
> I just have two comments about probes-thumb.h ...
>
> [...]
>
>> diff --git a/arch/arm/kernel/probes-thumb.h b/arch/arm/kernel/probes-thumb.h
>> new file mode 100644
>> index 0000000..3f39210
>> --- /dev/null
>> +++ b/arch/arm/kernel/probes-thumb.h
>> @@ -0,0 +1,136 @@
>> +/*
>> + * arch/arm/kernel/probes-arm.h
>> + *
>> + * Copyright 2013 Linaro Ltd.
>> + * Written by: David A. Long
>> + *
>> + * The code contained herein is licensed under the GNU General Public
>> + * License. You may obtain a copy of the GNU General Public License
>> + * Version 2 or later at the following locations:
>> + *
>> + * http://www.opensource.org/licenses/gpl-license.html
>> + * http://www.gnu.org/copyleft/gpl.html
>> + */
>> +
>> +#ifndef _ARM_KERNEL_PROBES_THUMB_H
>> +#define  _ARM_KERNEL_PROBES_THUMB_H
>> +
>> +/*
>> + * True if current instruction is in an IT block.
>> + */
>> +#define in_it_block(cpsr)	((cpsr & 0x06000c00) != 0x00000000)
>> +
>> +/*
>> + * Return the condition code to check for the currently executing instruction.
>> + * This is in ITSTATE<7:4> which is in CPSR<15:12> but is only valid if
>> + * in_it_block returns true.
>> + */
>> +#define current_cond(cpsr)	((cpsr >> 12) & 0xf)
>
> Looks like you forgot to remove above two #defines from kprobes-thumb.c
> when you moved them to this header file.

Fixed.

> Also...
>
>> +enum probes_t32_action {
>> +	PROBES_T32_EMULATE_NONE,
>> +	PROBES_T32_SIMULATE_NOP,
>> +	PROBES_T32_LDMSTM,
>> +	PROBES_T32_LDRDSTRD,
>> +	PROBES_T32_TABLE_BRANCH,
>> +	PROBES_T32_TST,
>> +	PROBES_T32_CMP,
>> +	PROBES_T32_MOV,
>> +	PROBES_T32_ADDSUB,
>> +	PROBES_T32_LOGICAL,
>> +	PROBES_T32_ADDWSUBW_PC,
>> +	PROBES_T32_ADDWSUBW,
>> +	PROBES_T32_MOVW,
>> +	PROBES_T32_SAT,
>> +	PROBES_T32_BITFIELD,
>> +	PROBES_T32_SEV,
>> +	PROBES_T32_WFE,
>> +	PROBES_T32_MRS,
>> +	PROBES_T32_BRANCH_COND,
>> +	PROBES_T32_BRANCH,
>> +	PROBES_T32_PLDI,
>> +	PROBES_T32_LDR_LIT,
>> +	PROBES_T32_LDRSTR,
>> +	PROBES_T32_SIGN_EXTEND,
>> +	PROBES_T32_MEDIA,
>> +	PROBES_T32_REVERSE,
>> +	PROBES_T32_MUL_ADD,
>> +	PROBES_T32_MUL_ADD2,
>> +	PROBES_T32_MUL_ADD_LONG
>> +};
>> +
>> +enum probes_t16_action {
>> +	PROBES_T16_ADD_SP,
>> +	PROBES_T16_CBZ,
>> +	PROBES_T16_SIGN_EXTEND,
>> +	PROBES_T16_PUSH,
>> +	PROBES_T16_POP,
>> +	PROBES_T16_SEV,
>> +	PROBES_T16_WFE,
>> +	PROBES_T16_IT,
>> +	PROBES_T16_CMP,
>> +	PROBES_T16_ADDSUB,
>> +	PROBES_T16_LOGICAL,
>> +	PROBES_T16_BLX,
>> +	PROBES_T16_HIREGOPS,
>> +	PROBES_T16_LDR_LIT,
>> +	PROBES_T16_LDRHSTRH,
>> +	PROBES_T16_LDRSTR,
>> +	PROBES_T16_ADR,
>> +	PROBES_T16_LDMSTM,
>> +	PROBES_T16_BRANCH_COND,
>> +	PROBES_T16_BRANCH
>> +};
>> +
>

Moved.

-dl


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