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#include <linux/sched.h>
#include <linux/stacktrace.h>
#include <linux/thread_info.h>
#include <linux/module.h>
#include <asm/ptrace.h>
#include <asm/stacktrace.h>
#include "kstack.h"
static void __save_stack_trace(struct thread_info *tp,
struct stack_trace *trace,
bool skip_sched)
{
unsigned long ksp, fp;
if (tp == current_thread_info()) {
stack_trace_flush();
__asm__ __volatile__("mov %%fp, %0" : "=r" (ksp));
} else {
ksp = tp->ksp;
}
fp = ksp + STACK_BIAS;
do {
struct sparc_stackf *sf;
struct pt_regs *regs;
unsigned long pc;
if (!kstack_valid(tp, fp))
break;
sf = (struct sparc_stackf *) fp;
regs = (struct pt_regs *) (sf + 1);
if (kstack_is_trap_frame(tp, regs)) {
if (!(regs->tstate & TSTATE_PRIV))
break;
pc = regs->tpc;
fp = regs->u_regs[UREG_I6] + STACK_BIAS;
} else {
pc = sf->callers_pc;
fp = (unsigned long)sf->fp + STACK_BIAS;
}
if (trace->skip > 0)
trace->skip--;
else if (!skip_sched || !in_sched_functions(pc))
trace->entries[trace->nr_entries++] = pc;
} while (trace->nr_entries < trace->max_entries);
}
void save_stack_trace(struct stack_trace *trace)
{
__save_stack_trace(current_thread_info(), trace, false);
}
EXPORT_SYMBOL_GPL(save_stack_trace);
void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
{
struct thread_info *tp = task_thread_info(tsk);
__save_stack_trace(tp, trace, true);
}
EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
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