1 /* 2 * Stack trace management functions 3 * 4 * Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com> 5 */ 6 #include <linux/sched.h> 7 #include <linux/stacktrace.h> 8 #include <linux/module.h> 9 #include <asm/stacktrace.h> 10 11 static void save_stack_warning(void *data, char *msg) 12 { 13 } 14 15 static void 16 save_stack_warning_symbol(void *data, char *msg, unsigned long symbol) 17 { 18 } 19 20 static int save_stack_stack(void *data, char *name) 21 { 22 return -1; 23 } 24 25 static void save_stack_address(void *data, unsigned long addr, int reliable) 26 { 27 struct stack_trace *trace = data; 28 if (trace->skip > 0) { 29 trace->skip--; 30 return; 31 } 32 if (trace->nr_entries < trace->max_entries) 33 trace->entries[trace->nr_entries++] = addr; 34 } 35 36 static void 37 save_stack_address_nosched(void *data, unsigned long addr, int reliable) 38 { 39 struct stack_trace *trace = (struct stack_trace *)data; 40 if (in_sched_functions(addr)) 41 return; 42 if (trace->skip > 0) { 43 trace->skip--; 44 return; 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 static const struct stacktrace_ops save_stack_ops_nosched = { 58 .warning = save_stack_warning, 59 .warning_symbol = save_stack_warning_symbol, 60 .stack = save_stack_stack, 61 .address = save_stack_address_nosched, 62 }; 63 64 /* 65 * Save stack-backtrace addresses into a stack_trace buffer. 66 */ 67 void save_stack_trace(struct stack_trace *trace) 68 { 69 dump_trace(current, NULL, NULL, 0, &save_stack_ops, trace); 70 if (trace->nr_entries < trace->max_entries) 71 trace->entries[trace->nr_entries++] = ULONG_MAX; 72 } 73 74 void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace) 75 { 76 dump_trace(tsk, NULL, NULL, 0, &save_stack_ops_nosched, trace); 77 if (trace->nr_entries < trace->max_entries) 78 trace->entries[trace->nr_entries++] = ULONG_MAX; 79 } 80