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sparc64: Add function graph tracer support.

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Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
2010-04-07 04:41:33 -07:00
parent a71d1d6bb1
commit 9960e9e894
10 changed files with 132 additions and 15 deletions
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58
arch/sparc/kernel/ftrace.c
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@@ -91,3 +91,61 @@ int __init ftrace_dyn_arch_init(void *data)
return 0;
}
#endif
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
#ifdef CONFIG_DYNAMIC_FTRACE
extern void ftrace_graph_call(void);
int ftrace_enable_ftrace_graph_caller(void)
{
unsigned long ip = (unsigned long)(&ftrace_graph_call);
u32 old, new;
old = *(u32 *) &ftrace_graph_call;
new = ftrace_call_replace(ip, (unsigned long) &ftrace_graph_caller);
return ftrace_modify_code(ip, old, new);
}
int ftrace_disable_ftrace_graph_caller(void)
{
unsigned long ip = (unsigned long)(&ftrace_graph_call);
u32 old, new;
old = *(u32 *) &ftrace_graph_call;
new = ftrace_call_replace(ip, (unsigned long) &ftrace_stub);
return ftrace_modify_code(ip, old, new);
}
#endif /* !CONFIG_DYNAMIC_FTRACE */
/*
* Hook the return address and push it in the stack of return addrs
* in current thread info.
*/
unsigned long prepare_ftrace_return(unsigned long parent,
unsigned long self_addr,
unsigned long frame_pointer)
{
unsigned long return_hooker = (unsigned long) &return_to_handler;
struct ftrace_graph_ent trace;
if (unlikely(atomic_read(&current->tracing_graph_pause)))
return parent + 8UL;
if (ftrace_push_return_trace(parent, self_addr, &trace.depth,
frame_pointer) == -EBUSY)
return parent + 8UL;
trace.func = self_addr;
/* Only trace if the calling function expects to */
if (!ftrace_graph_entry(&trace)) {
current->curr_ret_stack--;
return parent + 8UL;
}
return return_hooker;
}
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */