From: Steven Rostedt <rostedt@goodmis.org>
To: linux-kernel@vger.kernel.org
Cc: Ingo Molnar <mingo@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Frederic Weisbecker <fweisbec@gmail.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Thomas Gleixner <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>,
Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Subject: [PATCH 5/6 v2] ftrace/x86-64: Allow to change RIP in handlers
Date: Thu, 13 Sep 2012 23:00:17 -0400 [thread overview]
Message-ID: <20120914030232.866901397@goodmis.org> (raw)
In-Reply-To: 20120914030012.315074731@goodmis.org
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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.
Link: http://lkml.kernel.org/r/20120905143118.10329.5078.stgit@localhost.localdomain
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
arch/x86/kernel/entry_64.S | 4 ++++
1 file changed, 4 insertions(+)
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
--
1.7.10.4
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next prev parent reply other threads:[~2012-09-14 3:02 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-14 3:00 [PATCH 0/6 v2] [GIT PULL][3.7] tracing: cleanups and fixes Steven Rostedt
2012-09-14 3:00 ` [PATCH 1/6 v2] tracing: Skip printing "OK" if failed to disable event Steven Rostedt
2012-09-14 3:00 ` [PATCH 2/6 v2] trace: Stop compiling in trace_clock unconditionally Steven Rostedt
2012-09-14 3:00 ` [PATCH 3/6 v2] ftrace/x86: Adjust x86 regs.ip as like as x86-64 Steven Rostedt
2012-09-14 3:00 ` [PATCH 4/6 v2] kprobes/x86: Fix kprobes to collectly handle IP on ftrace Steven Rostedt
2012-09-14 3:00 ` Steven Rostedt [this message]
2012-09-14 3:00 ` [PATCH 6/6 v2] kprobes/x86: Fix to support jprobes on ftrace-based kprobe Steven Rostedt
2012-09-14 11:40 ` [PATCH 0/6 v2] [GIT PULL][3.7] tracing: cleanups and fixes Ingo Molnar
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