1 /* 2 * arch/sh/kernel/stacktrace.c 3 * 4 * Stack trace management functions 5 * 6 * Copyright (C) 2006 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 <asm/ptrace.h> 16 17 /* 18 * Save stack-backtrace addresses into a stack_trace buffer. 19 */ 20 void save_stack_trace(struct stack_trace *trace, struct task_struct *task) 21 { 22 unsigned long *sp; 23 24 if (!task) 25 task = current; 26 if (task == current) 27 sp = (unsigned long *)current_stack_pointer; 28 else 29 sp = (unsigned long *)task->thread.sp; 30 31 while (!kstack_end(sp)) { 32 unsigned long addr = *sp++; 33 34 if (__kernel_text_address(addr)) { 35 if (trace->skip > 0) 36 trace->skip--; 37 else 38 trace->entries[trace->nr_entries++] = addr; 39 if (trace->nr_entries >= trace->max_entries) 40 break; 41 } 42 } 43 } 44