1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * arch/ia64/kernel/stacktrace.c 4 * 5 * Stack trace management functions 6 * 7 */ 8 #include <linux/sched.h> 9 #include <linux/stacktrace.h> 10 #include <linux/module.h> 11 12 static void 13 ia64_do_save_stack(struct unw_frame_info *info, void *arg) 14 { 15 struct stack_trace *trace = arg; 16 unsigned long ip; 17 int skip = trace->skip; 18 19 trace->nr_entries = 0; 20 do { 21 unw_get_ip(info, &ip); 22 if (ip == 0) 23 break; 24 if (skip == 0) { 25 trace->entries[trace->nr_entries++] = ip; 26 if (trace->nr_entries == trace->max_entries) 27 break; 28 } else 29 skip--; 30 } while (unw_unwind(info) >= 0); 31 } 32 33 /* 34 * Save stack-backtrace addresses into a stack_trace buffer. 35 */ 36 void save_stack_trace(struct stack_trace *trace) 37 { 38 unw_init_running(ia64_do_save_stack, trace); 39 } 40 EXPORT_SYMBOL(save_stack_trace); 41