1 /* 2 * arch/sh/kernel/stacktrace.c 3 * 4 * Stack trace management functions 5 * 6 * Copyright (C) 2006 - 2008 Paul Mundt 7 * 8 * This file is subject to the terms and conditions of the GNU General Public 9 * License. See the file "COPYING" in the main directory of this archive 10 * for more details. 11 */ 12 #include <linux/sched.h> 13 #include <linux/stacktrace.h> 14 #include <linux/thread_info.h> 15 #include <linux/module.h> 16 #include <asm/ptrace.h> 17 18 /* 19 * Save stack-backtrace addresses into a stack_trace buffer. 20 */ 21 void save_stack_trace(struct stack_trace *trace) 22 { 23 unsigned long *sp = (unsigned long *)current_stack_pointer; 24 25 while (!kstack_end(sp)) { 26 unsigned long addr = *sp++; 27 28 if (__kernel_text_address(addr)) { 29 if (trace->skip > 0) 30 trace->skip--; 31 else 32 trace->entries[trace->nr_entries++] = addr; 33 if (trace->nr_entries >= trace->max_entries) 34 break; 35 } 36 } 37 } 38 EXPORT_SYMBOL_GPL(save_stack_trace); 39 40 void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace) 41 { 42 unsigned long *sp = (unsigned long *)tsk->thread.sp; 43 44 while (!kstack_end(sp)) { 45 unsigned long addr = *sp++; 46 47 if (__kernel_text_address(addr)) { 48 if (in_sched_functions(addr)) 49 break; 50 if (trace->skip > 0) 51 trace->skip--; 52 else 53 trace->entries[trace->nr_entries++] = addr; 54 if (trace->nr_entries >= trace->max_entries) 55 break; 56 } 57 } 58 } 59 EXPORT_SYMBOL_GPL(save_stack_trace_tsk); 60