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Subject[PATCH v7 3.2-rc2 10/30] x86: Set instruction pointer.

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 f0b4b2b..509c023 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 mm_struct *mm, 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 0be7e67..67b926f 100644
--- a/arch/x86/kernel/uprobes.c
+++ b/arch/x86/kernel/uprobes.c
@@ -397,3 +397,13 @@ int analyze_insn(struct mm_struct *mm, 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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