156 static bool is_valid_frame_record(struct frame_record *fr)  in is_valid_frame_record()  argument
158 	return is_valid_object((uintptr_t)fr, sizeof(struct frame_record));  in is_valid_frame_record()
165 static struct frame_record *adjust_frame_record(struct frame_record *fr)  in adjust_frame_record()  argument
168 	return fr;  in adjust_frame_record()
170 	return (struct frame_record *)((uintptr_t)fr - 4U);  in adjust_frame_record()
174 static void unwind_stack(struct frame_record *fr, uintptr_t current_pc,  in unwind_stack()  argument
181 	if (!is_valid_frame_record(fr)) {  in unwind_stack()
183 		       fr);  in unwind_stack()
187 	call_site = extract_address(fr->return_addr);  in unwind_stack()
190 		       fr);  in unwind_stack()
203 		if (!is_valid_frame_record(fr))  in unwind_stack()
211 		call_site = extract_address(fr->return_addr) - 4U;  in unwind_stack()
222 		fr = adjust_frame_record(fr->parent);  in unwind_stack()
254 	struct frame_record *fr = __builtin_frame_address(0U);  in backtrace()  local
259 	fr = adjust_frame_record(fr);  in backtrace()
263 	unwind_stack(fr, (uintptr_t)&backtrace, return_address);  in backtrace()