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linux/kernel/stacktrace.c at master · uiho/linux · GitHub
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/*
* kernel/stacktrace.c
*
* Stack trace management functions
*
* Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
*/
#include
<linux/sched.h>
#include
<linux/kernel.h>
#include
<linux/export.h>
#include
<linux/kallsyms.h>
#include
<linux/stacktrace.h>
void
print_stack_trace
(
struct
stack_trace
*
trace
,
int
spaces
)
{
int
i
;
if
(
WARN_ON
(!
trace
->
entries
))
return
;
for
(
i
=
0
;
i
<
trace
->
nr_entries
;
i
++
) {
printk
(
"%*c"
,
1
+
spaces
,
' '
);
print_ip_sym
(
trace
->
entries
[
i
]);
}
}
EXPORT_SYMBOL_GPL
(
print_stack_trace
);
int
snprint_stack_trace
(
char
*
buf
,
size_t
size
,
struct
stack_trace
*
trace
,
int
spaces
)
{
int
i
;
unsigned long
ip
;
int
generated
;
int
total
=
0
;
if
(
WARN_ON
(!
trace
->
entries
))
return
0
;
for
(
i
=
0
;
i
<
trace
->
nr_entries
;
i
++
) {
ip
=
trace
->
entries
[
i
];
generated
=
snprintf
(
buf
,
size
,
"%*c[<%p>] %pS\n"
,
1
+
spaces
,
' '
, (
void
*
)
ip
, (
void
*
)
ip
);
total
+=
generated
;
/* Assume that generated isn't a negative number */
if
(
generated
>=
size
) {
buf
+=
size
;
size
=
0
;
}
else
{
buf
+=
generated
;
size
-=
generated
;
}
}
return
total
;
}
EXPORT_SYMBOL_GPL
(
snprint_stack_trace
);
/*
* Architectures that do not implement save_stack_trace_tsk or
* save_stack_trace_regs get this weak alias and a once-per-bootup warning
* (whenever this facility is utilized - for example by procfs):
*/
__weak
void
save_stack_trace_tsk
(
struct
task_struct
*
tsk
,
struct
stack_trace
*
trace
)
{
WARN_ONCE
(
1
,
KERN_INFO
"save_stack_trace_tsk() not implemented yet.\n"
);
}
__weak
void
save_stack_trace_regs
(
struct
pt_regs
*
regs
,
struct
stack_trace
*
trace
)
{
WARN_ONCE
(
1
,
KERN_INFO
"save_stack_trace_regs() not implemented yet.\n"
);
}
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