Messages in this thread Patch in this message | | | From | Masami Hiramatsu <> | Subject | [PATCH -tip 3/4] ftrace/x86-64: Allow to change RIP in handlers | Date | Wed, 05 Sep 2012 23:31:18 +0900 |
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From: Steven Rostedt <rostedt@goodmis.org>
Allow ftrace handlers to change RIP register (regs->ip) in handlers. This will allow handlers to call another function instead of original function.
Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> ---
arch/x86/kernel/entry_64.S | 4 ++++ 1 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S index ed767b7..e9cc2b3 100644 --- a/arch/x86/kernel/entry_64.S +++ b/arch/x86/kernel/entry_64.S @@ -165,6 +165,10 @@ GLOBAL(ftrace_regs_call) movq EFLAGS(%rsp), %rax movq %rax, SS(%rsp) + /* Handlers can change the RIP */ + movq RIP(%rsp), %rax + movq %rax, SS+8(%rsp) + /* restore the rest of pt_regs */ movq R15(%rsp), %r15 movq R14(%rsp), %r14
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