71  *                       initial PC is in).
72  * @pc : Program counter at which to begin the search
74  * Return - PC at which stack frame creation occurs
77 static unsigned long *find_frame_creation(unsigned long *pc)  in find_frame_creation()  argument
86 	for (i = 0; i < 1000; i++, pc--) {  in find_frame_creation()
90 		if (!kernel_text_address((unsigned long) pc))  in find_frame_creation()
93 		instr = *pc;  in find_frame_creation()
102 				 frame_size, pc);  in find_frame_creation()
106 		pr_debug("    Found frame creation at 0x%p, size %d\n", pc,  in find_frame_creation()
108 		return pc;  in find_frame_creation()
117  * @pc          : Program counter within current function
125 static int lookup_prev_stack_frame(unsigned long fp, unsigned long pc,  in lookup_prev_stack_frame()  argument
133 	if (pc != (unsigned long) &_switch_to)  in lookup_prev_stack_frame()
134 		prologue = find_frame_creation((unsigned long *)pc);  in lookup_prev_stack_frame()
155 				    unsigned long pc, unsigned long fp,
165 static inline void unwind_trap(struct task_struct *task, unsigned long pc,  in unwind_trap()  argument
172 static inline void unwind_trap(struct task_struct *task, unsigned long pc,  in unwind_trap()  argument
177 	microblaze_unwind_inner(task, regs->pc, regs->r1, regs->r15, trace, loglvl);  in unwind_trap()
184  * @pc    : Program counter from which we start unwinding
186  * @leaf_return : Value of r15 at pc. If the function is a leaf, this is
188  * @trace : Where to store stack backtrace (PC values).
193 			     unsigned long pc, unsigned long fp,  in microblaze_unwind_inner()  argument
200 	pr_debug("    Unwinding with PC=%p, FP=%p\n", (void *)pc, (void *)fp);  in microblaze_unwind_inner()
201 	if (!pc || !fp || (pc & 3) || (fp & 3)) {  in microblaze_unwind_inner()
205 	for (; pc != 0;) {  in microblaze_unwind_inner()
207 		unsigned long return_to = pc +  2 * sizeof(unsigned long);  in microblaze_unwind_inner()
237 				unwind_trap(task, pc, fp, trace, loglvl);  in microblaze_unwind_inner()
241 		pc -= ofs;  in microblaze_unwind_inner()
248 				trace->entries[trace->nr_entries++] = pc;  in microblaze_unwind_inner()
255 			if (unlikely(pc == task_pt_regs(task)->pc)) {  in microblaze_unwind_inner()
257 					loglvl, (void *) pc,  in microblaze_unwind_inner()
262 				print_ip_sym(loglvl, pc);  in microblaze_unwind_inner()
266 		if (!kernel_text_address(pc))  in microblaze_unwind_inner()
269 		if (lookup_prev_stack_frame(fp, pc, leaf_return, &next_fp,  in microblaze_unwind_inner()
272 			pc = next_pc & ~3;  in microblaze_unwind_inner()
280 		pr_debug("    Next PC=%p, next FP=%p\n",  in microblaze_unwind_inner()
288  * @trace : Where to store stack backtrace (PC values).
298 			microblaze_unwind_inner(task, regs->pc, regs->r1,  in microblaze_unwind()
313 		unsigned long pc, fp;  in microblaze_unwind()  local
321 			: "=r" (pc)  in microblaze_unwind()
325 		microblaze_unwind_inner(current, pc, fp, 0, trace, loglvl);  in microblaze_unwind()