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authorMike Frysinger <vapier@gentoo.org>2010-01-22 07:59:32 -0500
committerMike Frysinger <vapier@gentoo.org>2010-03-09 00:30:50 -0500
commitb73faf74493fd1bc75a8938aa5d296facf50a650 (patch)
tree69edd54da1d535661ac5a14ee3aa27e5e4ca2337 /arch/blackfin
parentaebfef03249819886a7f9c981940cbd48d82ea47 (diff)
Blackfin: support new ftrace frame pointer semantics
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'arch/blackfin')
-rw-r--r--arch/blackfin/kernel/ftrace-entry.S12
-rw-r--r--arch/blackfin/kernel/ftrace.c6
2 files changed, 13 insertions, 5 deletions
diff --git a/arch/blackfin/kernel/ftrace-entry.S b/arch/blackfin/kernel/ftrace-entry.S
index db3a51b0af2..d66446b572c 100644
--- a/arch/blackfin/kernel/ftrace-entry.S
+++ b/arch/blackfin/kernel/ftrace-entry.S
@@ -115,9 +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;
@@ -136,6 +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;
diff --git a/arch/blackfin/kernel/ftrace.c b/arch/blackfin/kernel/ftrace.c
index f2c85ac6f2d..a61d948ea92 100644
--- a/arch/blackfin/kernel/ftrace.c
+++ b/arch/blackfin/kernel/ftrace.c
@@ -16,7 +16,8 @@
* Hook the return address and push it in the stack of return addrs
* in current thread info.
*/
-void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr)
+void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr,
+ unsigned long frame_pointer)
{
struct ftrace_graph_ent trace;
unsigned long return_hooker = (unsigned long)&return_to_handler;
@@ -24,7 +25,8 @@ void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr)
if (unlikely(atomic_read(&current->tracing_graph_pause)))
return;
- if (ftrace_push_return_trace(*parent, self_addr, &trace.depth, 0) == -EBUSY)
+ if (ftrace_push_return_trace(*parent, self_addr, &trace.depth,
+ frame_pointer) == -EBUSY)
return;
trace.func = self_addr;