75 lines
1.8 KiB
C
75 lines
1.8 KiB
C
/*
|
|
* Stack trace management functions
|
|
*
|
|
* Copyright IBM Corp. 2006
|
|
* Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
|
|
*/
|
|
|
|
#include <linux/sched.h>
|
|
#include <linux/sched/debug.h>
|
|
#include <linux/stacktrace.h>
|
|
#include <linux/kallsyms.h>
|
|
#include <linux/export.h>
|
|
|
|
static int __save_address(void *data, unsigned long address, int nosched)
|
|
{
|
|
struct stack_trace *trace = data;
|
|
|
|
if (nosched && in_sched_functions(address))
|
|
return 0;
|
|
if (trace->skip > 0) {
|
|
trace->skip--;
|
|
return 0;
|
|
}
|
|
if (trace->nr_entries < trace->max_entries) {
|
|
trace->entries[trace->nr_entries++] = address;
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static int save_address(void *data, unsigned long address, int reliable)
|
|
{
|
|
return __save_address(data, address, 0);
|
|
}
|
|
|
|
static int save_address_nosched(void *data, unsigned long address, int reliable)
|
|
{
|
|
return __save_address(data, address, 1);
|
|
}
|
|
|
|
void save_stack_trace(struct stack_trace *trace)
|
|
{
|
|
unsigned long sp;
|
|
|
|
sp = current_stack_pointer();
|
|
dump_trace(save_address, trace, NULL, sp);
|
|
if (trace->nr_entries < trace->max_entries)
|
|
trace->entries[trace->nr_entries++] = ULONG_MAX;
|
|
}
|
|
EXPORT_SYMBOL_GPL(save_stack_trace);
|
|
|
|
void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
|
|
{
|
|
unsigned long sp;
|
|
|
|
sp = tsk->thread.ksp;
|
|
if (tsk == current)
|
|
sp = current_stack_pointer();
|
|
dump_trace(save_address_nosched, trace, tsk, sp);
|
|
if (trace->nr_entries < trace->max_entries)
|
|
trace->entries[trace->nr_entries++] = ULONG_MAX;
|
|
}
|
|
EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
|
|
|
|
void save_stack_trace_regs(struct pt_regs *regs, struct stack_trace *trace)
|
|
{
|
|
unsigned long sp;
|
|
|
|
sp = kernel_stack_pointer(regs);
|
|
dump_trace(save_address, trace, NULL, sp);
|
|
if (trace->nr_entries < trace->max_entries)
|
|
trace->entries[trace->nr_entries++] = ULONG_MAX;
|
|
}
|
|
EXPORT_SYMBOL_GPL(save_stack_trace_regs);
|