1 /* 2 * arch/ia64/kernel/stacktrace.c 3 * 4 * Stack trace management functions 5 * 6 */ 7 #include <linux/sched.h> 8 #include <linux/stacktrace.h> 9 #include <linux/module.h> 10 11 static void 12 ia64_do_save_stack(struct unw_frame_info *info, void *arg) 13 { 14 struct stack_trace *trace = arg; 15 unsigned long ip; 16 int skip = trace->skip; 17 18 trace->nr_entries = 0; 19 do { 20 unw_get_ip(info, &ip); 21 if (ip == 0) 22 break; 23 if (skip == 0) { 24 trace->entries[trace->nr_entries++] = ip; 25 if (trace->nr_entries == trace->max_entries) 26 break; 27 } else 28 skip--; 29 } while (unw_unwind(info) >= 0); 30 } 31 32 /* 33 * Save stack-backtrace addresses into a stack_trace buffer. 34 */ 35 void save_stack_trace(struct stack_trace *trace) 36 { 37 unw_init_running(ia64_do_save_stack, trace); 38 } 39 EXPORT_SYMBOL(save_stack_trace); 40