LXR linux/arch/sh/kernel/stacktrace.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * arch/sh/kernel/stacktrace.c
   4 *
   5 * Stack trace management functions
   6 *
   7 *  Copyright (C) 2006 - 2008  Paul Mundt
   8 */
   9#include <linux/sched.h>
  10#include <linux/sched/debug.h>
  11#include <linux/stacktrace.h>
  12#include <linux/thread_info.h>
  13#include <linux/module.h>
  14#include <asm/unwinder.h>
  15#include <asm/ptrace.h>
  16#include <asm/stacktrace.h>
  17
  18/*
  19 * Save stack-backtrace addresses into a stack_trace buffer.
  20 */
  21static void save_stack_address(void *data, unsigned long addr, int reliable)
  22{
  23        struct stack_trace *trace = data;
  24
  25        if (!reliable)
  26                return;
  27
  28        if (trace->skip > 0) {
  29                trace->skip--;
  30                return;
  31        }
  32
  33        if (trace->nr_entries < trace->max_entries)
  34                trace->entries[trace->nr_entries++] = addr;
  35}
  36
  37static const struct stacktrace_ops save_stack_ops = {
  38        .address = save_stack_address,
  39};
  40
  41void save_stack_trace(struct stack_trace *trace)
  42{
  43        unsigned long *sp = (unsigned long *)current_stack_pointer;
  44
  45        unwind_stack(current, NULL, sp,  &save_stack_ops, trace);
  46}
  47EXPORT_SYMBOL_GPL(save_stack_trace);
  48
  49static void
  50save_stack_address_nosched(void *data, unsigned long addr, int reliable)
  51{
  52        struct stack_trace *trace = (struct stack_trace *)data;
  53
  54        if (!reliable)
  55                return;
  56
  57        if (in_sched_functions(addr))
  58                return;
  59
  60        if (trace->skip > 0) {
  61                trace->skip--;
  62                return;
  63        }
  64
  65        if (trace->nr_entries < trace->max_entries)
  66                trace->entries[trace->nr_entries++] = addr;
  67}
  68
  69static const struct stacktrace_ops save_stack_ops_nosched = {
  70        .address = save_stack_address_nosched,
  71};
  72
  73void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
  74{
  75        unsigned long *sp = (unsigned long *)tsk->thread.sp;
  76
  77        unwind_stack(current, NULL, sp,  &save_stack_ops_nosched, trace);
  78}
  79EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
  80