208 static int unwind_special(struct unwind_frame_info *info, unsigned long pc, int frame_size)  in unwind_special()  argument
214 		struct pt_regs *regs = (struct pt_regs *)(info->sp - frame_size - PT_SZ_ALGN);  in unwind_special()
216 		info->prev_sp = regs->gr[30];  in unwind_special()
217 		info->prev_ip = regs->iaoq[0];  in unwind_special()
225 static void unwind_frame_regs(struct unwind_frame_info *info)  in unwind_frame_regs()  argument
233 	e = find_unwind_entry(info->ip);  in unwind_frame_regs()
237 		dbg("Cannot find unwind entry for 0x%lx; forced unwinding\n", info->ip);  in unwind_frame_regs()
245 			kallsyms_lookup(info->ip, NULL, NULL, &modname,  in unwind_frame_regs()
248 			dbg("info->ip = 0x%lx, name = %s\n", info->ip, symname);  in unwind_frame_regs()
251 				info->prev_sp = info->sp - CALLEE_SAVE_FRAME_SIZE;  in unwind_frame_regs()
252 				info->prev_ip = *(unsigned long *)(info->prev_sp - RP_OFFSET);  in unwind_frame_regs()
255 				    info->ip, info->prev_sp,   in unwind_frame_regs()
256 				    info->prev_ip);  in unwind_frame_regs()
260 				info->prev_ip = info->prev_sp = 0;  in unwind_frame_regs()
273 		sp = info->sp & ~63;  in unwind_frame_regs()
277 			info->prev_sp = sp - 64;  in unwind_frame_regs()
278 			info->prev_ip = 0;  in unwind_frame_regs()
279 			if (get_user(tmp, (unsigned long *)(info->prev_sp - RP_OFFSET)))   in unwind_frame_regs()
281 			info->prev_ip = tmp;  in unwind_frame_regs()
282 			sp = info->prev_sp;  in unwind_frame_regs()
283 		} while (!kernel_text_address(info->prev_ip));  in unwind_frame_regs()
285 		info->rp = 0;  in unwind_frame_regs()
288 		    "prev_sp=%lx prev_ip=%lx\n", info->ip,   in unwind_frame_regs()
289 		    info->prev_sp, info->prev_ip);  in unwind_frame_regs()
301 		     npc < info->ip;   in unwind_frame_regs()
312 				    "%lx, frame_size = %ld\n", info->ip,  in unwind_frame_regs()
319 				    "%lx, frame_size = %ld\n", info->ip,  in unwind_frame_regs()
326 				    "-20(sp) @ %lx\n", info->ip, npc);  in unwind_frame_regs()
332 				    "-16(sp) @ %lx\n", info->ip, npc);  in unwind_frame_regs()
336 		if (!unwind_special(info, e->region_start, frame_size)) {  in unwind_frame_regs()
337 			info->prev_sp = info->sp - frame_size;  in unwind_frame_regs()
339 				info->rp = info->r31;  in unwind_frame_regs()
341 				info->rp = *(unsigned long *)(info->prev_sp - rpoffset);  in unwind_frame_regs()
342 			info->prev_ip = info->rp;  in unwind_frame_regs()
343 			info->rp = 0;  in unwind_frame_regs()
347 		    "prev_ip=%lx npc=%lx\n", info->ip, info->prev_sp,   in unwind_frame_regs()
348 		    info->prev_ip, npc);  in unwind_frame_regs()
352 void unwind_frame_init(struct unwind_frame_info *info, struct task_struct *t,   in unwind_frame_init()  argument
355 	memset(info, 0, sizeof(struct unwind_frame_info));  in unwind_frame_init()
356 	info->t = t;  in unwind_frame_init()
357 	info->sp = regs->gr[30];  in unwind_frame_init()
358 	info->ip = regs->iaoq[0];  in unwind_frame_init()
359 	info->rp = regs->gr[2];  in unwind_frame_init()
360 	info->r31 = regs->gr[31];  in unwind_frame_init()
363 	    t ? (int)t->pid : -1, info->sp, info->ip);  in unwind_frame_init()
366 void unwind_frame_init_from_blocked_task(struct unwind_frame_info *info, struct task_struct *t)  in unwind_frame_init_from_blocked_task()  argument
377 	unwind_frame_init(info, t, r2);  in unwind_frame_init_from_blocked_task()
381 void unwind_frame_init_running(struct unwind_frame_info *info, struct pt_regs *regs)  in unwind_frame_init_running()  argument
383 	unwind_frame_init(info, current, regs);  in unwind_frame_init_running()
406 int unwind_to_user(struct unwind_frame_info *info)  in unwind_to_user()  argument
411 		ret = unwind_once(info);  in unwind_to_user()
412 	} while (!ret && !(info->ip & 3));  in unwind_to_user()
419 	struct unwind_frame_info info;  in return_address()  local
429 	unwind_frame_init(&info, current, &r);  in return_address()
434 		if (unwind_once(&info) < 0 || info.ip == 0)  in return_address()
436 		if (!kernel_text_address(info.ip))  in return_address()
438 	} while (info.ip && level--);  in return_address()
440 	return info.ip;  in return_address()