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

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Stack trace management functions
   4 *
   5 *  Copyright (C) 2009 Helge Deller <deller@gmx.de>
   6 *  based on arch/x86/kernel/stacktrace.c by Ingo Molnar <mingo@redhat.com>
   7 *  and parisc unwind functions by Randolph Chung <tausq@debian.org>
   8 *
   9 *  TODO: Userspace stacktrace (CONFIG_USER_STACKTRACE_SUPPORT)
  10 */
  11#include <linux/module.h>
  12#include <linux/stacktrace.h>
  13
  14#include <asm/unwind.h>
  15
  16static void dump_trace(struct task_struct *task, struct stack_trace *trace)
  17{
  18        struct unwind_frame_info info;
  19
  20        unwind_frame_init_task(&info, task, NULL);
  21
  22        /* unwind stack and save entries in stack_trace struct */
  23        trace->nr_entries = 0;
  24        while (trace->nr_entries < trace->max_entries) {
  25                if (unwind_once(&info) < 0 || info.ip == 0)
  26                        break;
  27
  28                if (__kernel_text_address(info.ip))
  29                        trace->entries[trace->nr_entries++] = info.ip;
  30        }
  31}
  32
  33/*
  34 * Save stack-backtrace addresses into a stack_trace buffer.
  35 */
  36void save_stack_trace(struct stack_trace *trace)
  37{
  38        dump_trace(current, trace);
  39}
  40EXPORT_SYMBOL_GPL(save_stack_trace);
  41
  42void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
  43{
  44        dump_trace(tsk, trace);
  45}
  46EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
  47