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Commit b73faf74 authored by Mike Frysinger's avatar Mike Frysinger
Browse files

Blackfin: support new ftrace frame pointer semantics 



Signed-off-by: default avatarMike Frysinger <vapier@gentoo.org>
parent aebfef03

arch/blackfin/kernel/ftrace-entry.S

+9 −3
Original line number Diff line number Diff line
@@ -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;

arch/blackfin/kernel/ftrace.c

+4 −2
Original line number Diff line number Diff line
@@ -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;