linux-kernel - [PATCH v5 3.1.0-rc4-tip 10/26] x86: Set instruction pointer.

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Message-Id: <20110920120148.25326.96997.sendpatchset@srdronam.in.ibm.com>
Date:	Tue, 20 Sep 2011 17:31:48 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Linux-mm <linux-mm@...ck.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Hugh Dickins <hughd@...gle.com>,
	Christoph Hellwig <hch@...radead.org>,
	Jonathan Corbet <corbet@....net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Roland McGrath <roland@...k.frob.com>,
	Andi Kleen <andi@...stfloor.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH v5 3.1.0-rc4-tip 10/26]   x86: Set instruction pointer.


Provides x86 specific routine to set the instruction pointer to the
given address.

Signed-off-by: Jim Keniston <jkenisto@...ibm.com>
Signed-off-by: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
---
 arch/x86/include/asm/uprobes.h |    1 +
 arch/x86/kernel/uprobes.c      |   10 ++++++++++
 2 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/arch/x86/include/asm/uprobes.h b/arch/x86/include/asm/uprobes.h
index 4295ce0..35ac9d7 100644
--- a/arch/x86/include/asm/uprobes.h
+++ b/arch/x86/include/asm/uprobes.h
@@ -39,4 +39,5 @@ struct uprobe_arch_info {};
 #endif
 struct uprobe;
 extern int analyze_insn(struct task_struct *tsk, struct uprobe *uprobe);
+extern void set_instruction_pointer(struct pt_regs *regs, unsigned long vaddr);
 #endif	/* _ASM_UPROBES_H */
diff --git a/arch/x86/kernel/uprobes.c b/arch/x86/kernel/uprobes.c
index e4fd077..e1c1dfe 100644
--- a/arch/x86/kernel/uprobes.c
+++ b/arch/x86/kernel/uprobes.c
@@ -383,3 +383,13 @@ int analyze_insn(struct task_struct *tsk, struct uprobe *uprobe)
 	prepare_fixups(uprobe, &insn);
 	return 0;
 }
+
+/*
+ * @reg: reflects the saved state of the task
+ * @vaddr: the virtual address to jump to.
+ * Return 0 on success or a -ve number on error.
+ */
+void set_instruction_pointer(struct pt_regs *regs, unsigned long vaddr)
+{
+	regs->ip = vaddr;
+}
--
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