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#include <linux/sched.h>
#include <linux/sched/debug.h>
#include <linux/stacktrace.h>
#include <asm/stacktrace.h>
void walk_stackframe(unsigned long sp,
int (*fn)(unsigned long addr, void *data),
void *data)
{
unsigned long high = ALIGN(sp, THREAD_SIZE);
for (; sp <= high - 4; sp += 4) {
unsigned long addr = *(unsigned long *) sp;
if (!kernel_text_address(addr))
continue;
if (fn(addr, data))
break;
}
}
struct stack_trace_data {
struct stack_trace *trace;
unsigned int no_sched_functions;
unsigned int skip;
};
#ifdef CONFIG_STACKTRACE
static int save_trace(unsigned long addr, void *d)
{
struct stack_trace_data *data = d;
struct stack_trace *trace = data->trace;
if (data->no_sched_functions && in_sched_functions(addr))
return 0;
if (data->skip) {
data->skip--;
return 0;
}
trace->entries[trace->nr_entries++] = addr;
return trace->nr_entries >= trace->max_entries;
}
void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
{
struct stack_trace_data data;
unsigned long sp;
data.trace = trace;
data.skip = trace->skip;
if (tsk != current) {
data.no_sched_functions = 1;
sp = tsk->thread.ksp;
} else {
data.no_sched_functions = 0;
sp = rdsp();
}
walk_stackframe(sp, save_trace, &data);
if (trace->nr_entries < trace->max_entries)
trace->entries[trace->nr_entries++] = ULONG_MAX;
}
void save_stack_trace(struct stack_trace *trace)
{
save_stack_trace_tsk(current, trace);
}
EXPORT_SYMBOL_GPL(save_stack_trace);
#endif /* CONFIG_STACKTRACE */
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