From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755249Ab1KJTD6 (ORCPT ); Thu, 10 Nov 2011 14:03:58 -0500 Received: from e23smtp09.au.ibm.com ([202.81.31.142]:36568 "EHLO e23smtp09.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753445Ab1KJTDy (ORCPT ); Thu, 10 Nov 2011 14:03:54 -0500 From: Srikar Dronamraju To: Peter Zijlstra , Linus Torvalds Cc: Oleg Nesterov , Andrew Morton , LKML , Linux-mm , Ingo Molnar , Andi Kleen , Christoph Hellwig , Steven Rostedt , Roland McGrath , Thomas Gleixner , Masami Hiramatsu , Arnaldo Carvalho de Melo , Anton Arapov , Ananth N Mavinakayanahalli , Jim Keniston , Stephen Wilson Date: Fri, 11 Nov 2011 00:08:41 +0530 Message-Id: <20111110183841.11361.36652.sendpatchset@srdronam.in.ibm.com> In-Reply-To: <20111110183725.11361.57827.sendpatchset@srdronam.in.ibm.com> References: <20111110183725.11361.57827.sendpatchset@srdronam.in.ibm.com> Subject: [PATCH v6 3.2-rc1 6/28] Uprobes: define fixups. x-cbid: 11111009-3568-0000-0000-000000AC37AB Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org During the first insertion of a probepoint, instruction is analyzed for fixups and cached in the per-uprobe struct. On a probehit, the cached fixup is used. Fixup analysis and caching is done in arch-specific code. Signed-off-by: Jim Keniston Signed-off-by: Srikar Dronamraju --- include/linux/uprobes.h | 12 ++++++++++++ 1 files changed, 12 insertions(+), 0 deletions(-) diff --git a/include/linux/uprobes.h b/include/linux/uprobes.h index fa2b663..dd308fa 100644 --- a/include/linux/uprobes.h +++ b/include/linux/uprobes.h @@ -33,6 +33,17 @@ struct vm_area_struct; #define MAX_UINSN_BYTES 4 #endif +#define uprobe_opcode_sz sizeof(uprobe_opcode_t) + +/* Post-execution fixups. Some architectures may define others. */ + +/* No fixup needed */ +#define UPROBES_FIX_NONE 0x0 +/* Adjust IP back to vicinity of actual insn */ +#define UPROBES_FIX_IP 0x1 +/* Adjust the return address of a call insn */ +#define UPROBES_FIX_CALL 0x2 + struct uprobe_consumer { int (*handler)(struct uprobe_consumer *self, struct pt_regs *regs); /* @@ -53,6 +64,7 @@ struct uprobe { struct inode *inode; /* Also hold a ref to inode */ loff_t offset; int copy; + u16 fixups; u8 insn[MAX_UINSN_BYTES]; };