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-rw-r--r--arch/blackfin/kernel/ftrace-entry.S23
1 files changed, 19 insertions, 4 deletions
diff --git a/arch/blackfin/kernel/ftrace-entry.S b/arch/blackfin/kernel/ftrace-entry.S
index 76dd4fbcd17..d66446b572c 100644
--- a/arch/blackfin/kernel/ftrace-entry.S
+++ b/arch/blackfin/kernel/ftrace-entry.S
@@ -1,7 +1,7 @@
/*
* mcount and friends -- ftrace stuff
*
- * Copyright (C) 2009 Analog Devices Inc.
+ * Copyright (C) 2009-2010 Analog Devices Inc.
* Licensed under the GPL-2 or later.
*/
@@ -21,6 +21,15 @@
* function will be waiting there. mmmm pie.
*/
ENTRY(__mcount)
+#ifdef CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST
+ /* optional micro optimization: return if stopped */
+ p1.l = _function_trace_stop;
+ p1.h = _function_trace_stop;
+ r3 = [p1];
+ cc = r3 == 0;
+ if ! cc jump _ftrace_stub (bp);
+#endif
+
/* save third function arg early so we can do testing below */
[--sp] = r2;
@@ -106,9 +115,12 @@ ENTRY(_ftrace_graph_caller)
[--sp] = r1;
[--sp] = rets;
- /* prepare_ftrace_return(unsigned long *parent, unsigned long self_addr) */
- r0 = sp;
- r1 = rets;
+ /* prepare_ftrace_return(parent, self_addr, frame_pointer) */
+ r0 = sp; /* unsigned long *parent */
+ r1 = rets; /* unsigned long self_addr */
+#ifdef CONFIG_HAVE_FUNCTION_GRAPH_FP_TEST
+ r2 = fp; /* unsigned long frame_pointer */
+#endif
r0 += 16; /* skip the 4 local regs on stack */
r1 += -MCOUNT_INSN_SIZE;
call _prepare_ftrace_return;
@@ -127,6 +139,9 @@ ENTRY(_return_to_handler)
[--sp] = r1;
/* get original return address */
+#ifdef CONFIG_HAVE_FUNCTION_GRAPH_FP_TEST
+ r0 = fp; /* Blackfin is sane, so omit this */
+#endif
call _ftrace_return_to_handler;
rets = r0;