Commit-ID: 47d5a5f88b9d25d6464c9b60c28f391e84e3ed65 Gitweb: http://git.kernel.org/tip/47d5a5f88b9d25d6464c9b60c28f391e84e3ed65 Author: Steven Rostedt <[email protected]> AuthorDate: Wed, 5 Sep 2012 23:31:18 +0900 Committer: Steven Rostedt <[email protected]> CommitDate: Thu, 13 Sep 2012 22:52:10 -0400
ftrace/x86-64: Allow to change RIP in handlers Allow ftrace handlers to change RIP register (regs->ip) in handlers. This will allow handlers to call another function instead of original function. Link: http://lkml.kernel.org/r/[email protected] Cc: Peter Zijlstra <[email protected]> Cc: Frederic Weisbecker <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: "H. Peter Anvin" <[email protected]> Signed-off-by: Masami Hiramatsu <[email protected]> Signed-off-by: Steven Rostedt <[email protected]> --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
