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authorWu Zhangjin <wuzhangjin@gmail.com>2009-11-20 20:34:36 +0800
committerRalf Baechle <ralf@linux-mips.org>2009-12-17 01:57:25 +0000
commit046199cae714a7f9e88f5a7940b077f4515f48cb (patch)
tree8fb3a93a80fc2f719daa0ac905b610de68cf6693 /arch/mips/kernel/mcount.S
parente17ff5fec65a0213416efbe7ceae5f2f9887dda2 (diff)
downloadop-kernel-dev-046199cae714a7f9e88f5a7940b077f4515f48cb.zip
op-kernel-dev-046199cae714a7f9e88f5a7940b077f4515f48cb.tar.gz
MIPS: Tracing: Make ftrace for MIPS work without -fno-omit-frame-pointer
When remove the -fno-omit-frame-pointer, gcc will not save the frame pointer for us, we need to save one ourselves. Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Nicholas Mc Guire <der.herr@hofr.at> Cc: zhangfx@lemote.com Cc: Wu Zhangjin <wuzhangjin@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: linux-kernel@vger.kernel.org Cc: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/679/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/kernel/mcount.S')
-rw-r--r--arch/mips/kernel/mcount.S8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/mips/kernel/mcount.S b/arch/mips/kernel/mcount.S
index 98d4690..bdfef2c 100644
--- a/arch/mips/kernel/mcount.S
+++ b/arch/mips/kernel/mcount.S
@@ -139,7 +139,15 @@ NESTED(ftrace_graph_caller, PT_SIZE, ra)
#endif
PTR_LA a0, PT_R1(sp) /* arg1: &AT -> a0 */
jal prepare_ftrace_return
+#ifdef CONFIG_FRAME_POINTER
move a2, fp /* arg3: frame pointer */
+#else
+#ifdef CONFIG_64BIT
+ PTR_LA a2, PT_SIZE(sp)
+#else
+ PTR_LA a2, (PT_SIZE+8)(sp)
+#endif
+#endif
MCOUNT_RESTORE_REGS
RETURN_BACK
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