microblaze/kernel/unwind.c

72  * @pc : Program counter at which to begin the search
77 static unsigned long *find_frame_creation(unsigned long *pc)
86 	for (i = 0; i < 1000; i++, pc--) {
90 		if (!kernel_text_address((unsigned long) pc))
93 		instr = *pc;
102 				 frame_size, pc);
106 		pr_debug("    Found frame creation at 0x%p, size %d\n", pc,
108 		return pc;
117  * @pc          : Program counter within current function
125 static int lookup_prev_stack_frame(unsigned long fp, unsigned long pc,
133 	if (pc != (unsigned long) &_switch_to)
134 		prologue = find_frame_creation((unsigned long *)pc);
155 				    unsigned long pc, unsigned long fp,
164 static inline void unwind_trap(struct task_struct *task, unsigned long pc,
174  * @pc    : Program counter from which we start unwinding
176  * @leaf_return : Value of r15 at pc. If the function is a leaf, this is
183 			     unsigned long pc, unsigned long fp,
190 	pr_debug("    Unwinding with PC=%p, FP=%p\n", (void *)pc, (void *)fp);
191 	if (!pc || !fp || (pc & 3) || (fp & 3)) {
195 	for (; pc != 0;) {
197 		unsigned long return_to = pc +  2 * sizeof(unsigned long);
218 				unwind_trap(task, pc, fp, trace, loglvl);
222 		pc -= ofs;
229 				trace->entries[trace->nr_entries++] = pc;
236 			if (unlikely(pc == task_pt_regs(task)->pc)) {
238 					loglvl, (void *) pc,
243 				print_ip_sym(loglvl, pc);
247 		if (!kernel_text_address(pc))
250 		if (lookup_prev_stack_frame(fp, pc, leaf_return, &next_fp,
253 			pc = next_pc & ~3;
279 			microblaze_unwind_inner(task, regs->pc, regs->r1,
294 		unsigned long pc, fp;
302 			: "=r" (pc)
306 		microblaze_unwind_inner(current, pc, fp, 0, trace, loglvl);