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Blackfin: support new ftrace frame pointer semantics 

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Mike Frysinger 2010-01-22 07:59:32 -05:00
parent aebfef0324
commit b73faf7449
2 changed files with 13 additions and 5 deletions
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12
arch/blackfin/kernel/ftrace-entry.S
View File

@ -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;

6
arch/blackfin/kernel/ftrace.c
View File

@ -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;