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/unwinder.h> 17 #include <asm/ptrace.h> 18 #include <asm/stacktrace.h> 19 20 static void save_stack_warning(void *data, char *msg) 21 { 22 } 23 24 static void 25 save_stack_warning_symbol(void *data, char *msg, unsigned long symbol) 26 { 27 } 28 29 static int save_stack_stack(void *data, char *name) 30 { 31 return 0; 32 } 33 34 /* 35 * Save stack-backtrace addresses into a stack_trace buffer. 36 */ 37 static void save_stack_address(void *data, unsigned long addr, int reliable) 38 { 39 struct stack_trace *trace = data; 40 41 if (trace->skip > 0) { 42 trace->skip--; 43 return; 44 } 45 46 if (trace->nr_entries < trace->max_entries) 47 trace->entries[trace->nr_entries++] = addr; 48 } 49 50 static const struct stacktrace_ops save_stack_ops = { 51 .warning = save_stack_warning, 52 .warning_symbol = save_stack_warning_symbol, 53 .stack = save_stack_stack, 54 .address = save_stack_address, 55 }; 56 57 void save_stack_trace(struct stack_trace *trace) 58 { 59 unsigned long *sp = (unsigned long *)current_stack_pointer; 60 61 unwind_stack(current, NULL, sp, &save_stack_ops, trace); 62 } 63 EXPORT_SYMBOL_GPL(save_stack_trace); 64 65 static void 66 save_stack_address_nosched(void *data, unsigned long addr, int reliable) 67 { 68 struct stack_trace *trace = (struct stack_trace *)data; 69 70 if (in_sched_functions(addr)) 71 return; 72 73 if (trace->skip > 0) { 74 trace->skip--; 75 return; 76 } 77 78 if (trace->nr_entries < trace->max_entries) 79 trace->entries[trace->nr_entries++] = addr; 80 } 81 82 static const struct stacktrace_ops save_stack_ops_nosched = { 83 .warning = save_stack_warning, 84 .warning_symbol = save_stack_warning_symbol, 85 .stack = save_stack_stack, 86 .address = save_stack_address_nosched, 87 }; 88 89 void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace) 90 { 91 unsigned long *sp = (unsigned long *)tsk->thread.sp; 92 93 unwind_stack(current, NULL, sp, &save_stack_ops_nosched, trace); 94 } 95 EXPORT_SYMBOL_GPL(save_stack_trace_tsk); 96