arch/s390/kernel/stacktrace.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Stack trace management functions
   4  *
   5  *  Copyright IBM Corp. 2006
   6  *  Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
   7  */
   8
   9 #include <linux/sched.h>
  10 #include <linux/sched/debug.h>
  11 #include <linux/stacktrace.h>
  12 #include <linux/kallsyms.h>
  13 #include <linux/export.h>
  14 #include <asm/stacktrace.h>
  15 #include <asm/unwind.h>
  16
  17 void save_stack_trace(struct stack_trace *trace)
  18 {
  19         struct unwind_state state;
  20
  21         unwind_for_each_frame(&state, current, NULL, 0) {
  22                 if (trace->nr_entries >= trace->max_entries)
  23                         break;
  24                 if (trace->skip > 0)
  25                         trace->skip--;
  26                 else
  27                         trace->entries[trace->nr_entries++] = state.ip;
  28         }
  29 }
  30 EXPORT_SYMBOL_GPL(save_stack_trace);
  31
  32 void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
  33 {
  34         struct unwind_state state;
  35
  36         unwind_for_each_frame(&state, tsk, NULL, 0) {
  37                 if (trace->nr_entries >= trace->max_entries)
  38                         break;
  39                 if (in_sched_functions(state.ip))
  40                         continue;
  41                 if (trace->skip > 0)
  42                         trace->skip--;
  43                 else
  44                         trace->entries[trace->nr_entries++] = state.ip;
  45         }
  46 }
  47 EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
  48
  49 void save_stack_trace_regs(struct pt_regs *regs, struct stack_trace *trace)
  50 {
  51         struct unwind_state state;
  52
  53         unwind_for_each_frame(&state, current, regs, 0) {
  54                 if (trace->nr_entries >= trace->max_entries)
  55                         break;
  56                 if (trace->skip > 0)
  57                         trace->skip--;
  58                 else
  59                         trace->entries[trace->nr_entries++] = state.ip;
  60         }
  61 }
  62 EXPORT_SYMBOL_GPL(save_stack_trace_regs);