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
  16 static 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  */
  36 void save_stack_trace(struct stack_trace *trace)
  37 {
  38         dump_trace(current, trace);
  39 }
  40 EXPORT_SYMBOL_GPL(save_stack_trace);
  41
  42 void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
  43 {
  44         dump_trace(tsk, trace);
  45 }
  46 EXPORT_SYMBOL_GPL(save_stack_trace_tsk);