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

[Srikar Dronamraju <srikar@linux.vnet.ibm.com>]

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

Signed-off-by: Jim Keniston <jkenisto@us.ibm.com>
Signed-off-by: Srikar Dronamraju <srikar@linux.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;
+}