4 * Copyright 2008 Christoph Hellwig, IBM Corp.
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
13 #include <linux/module.h>
14 #include <linux/sched.h>
15 #include <linux/stacktrace.h>
16 #include <asm/ptrace.h>
17 #include <asm/processor.h>
20 * Save stack-backtrace addresses into a stack_trace buffer.
22 static void save_context_stack(struct stack_trace
*trace
, unsigned long sp
,
23 struct task_struct
*tsk
, int savesched
)
26 unsigned long *stack
= (unsigned long *) sp
;
27 unsigned long newsp
, ip
;
29 if (!validate_sp(sp
, tsk
, STACK_FRAME_OVERHEAD
))
33 ip
= stack
[STACK_FRAME_LR_SAVE
];
35 if (savesched
|| !in_sched_functions(ip
)) {
37 trace
->entries
[trace
->nr_entries
++] = ip
;
42 if (trace
->nr_entries
>= trace
->max_entries
)
49 void save_stack_trace(struct stack_trace
*trace
)
53 asm("mr %0,1" : "=r" (sp
));
55 save_context_stack(trace
, sp
, current
, 1);
57 EXPORT_SYMBOL_GPL(save_stack_trace
);
59 void save_stack_trace_tsk(struct task_struct
*tsk
, struct stack_trace
*trace
)
61 save_context_stack(trace
, tsk
->thread
.ksp
, tsk
, 0);
63 EXPORT_SYMBOL_GPL(save_stack_trace_tsk
);
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