8  * Copyright (C) 2001 - 2013 Tensilica Inc.
32 	unsigned long windowstart = regs->windowstart;  in xtensa_backtrace_user()
33 	unsigned long windowbase = regs->windowbase;  in xtensa_backtrace_user()
34 	unsigned long a0 = regs->areg[0];  in xtensa_backtrace_user()
35 	unsigned long a1 = regs->areg[1];  in xtensa_backtrace_user()
36 	unsigned long pc = regs->pc;  in xtensa_backtrace_user()
40 	if (!depth--)  in xtensa_backtrace_user()
51 	     !(regs->ps & PS_WOE_MASK)))  in xtensa_backtrace_user()
63 	/* Rotate WINDOWSTART to move the bit corresponding to  in xtensa_backtrace_user()
64 	 * the current window to the bit #0.  in xtensa_backtrace_user()
71 	for (index = WSBITS - 1; (index > 0) && depth; depth--, index--)  in xtensa_backtrace_user()
78 			a0 = regs->areg[index * 4];  in xtensa_backtrace_user()
79 			a1 = regs->areg[index * 4 + 1];  in xtensa_backtrace_user()
96 	/* a1 = regs->areg[1]; */  in xtensa_backtrace_user()
97 	while (a0 != 0 && depth--) {  in xtensa_backtrace_user()
122 	unsigned long pc = regs->depc > VALID_DOUBLE_EXCEPTION_ADDRESS ?  in xtensa_backtrace_kernel()
123 		regs->depc : regs->pc;  in xtensa_backtrace_kernel()
125 	unsigned long a0 = regs->areg[0];  in xtensa_backtrace_kernel()
126 	unsigned long a1 = regs->areg[1];  in xtensa_backtrace_kernel()
128 	sp_start = a1 & ~(THREAD_SIZE - 1);  in xtensa_backtrace_kernel()
137 	while (a1 > sp_start && a1 < sp_end && depth--) {  in xtensa_backtrace_kernel()
154 			a0 = regs->areg[0];  in xtensa_backtrace_kernel()
155 			a1 = regs->areg[1];  in xtensa_backtrace_kernel()
211 	struct stack_trace *trace = trace_data->trace;  in stack_trace_cb()
213 	if (trace_data->skip) {  in stack_trace_cb()
214 		--trace_data->skip;  in stack_trace_cb()
217 	if (!kernel_text_address(frame->pc))  in stack_trace_cb()
220 	trace->entries[trace->nr_entries++] = frame->pc;  in stack_trace_cb()
221 	return trace->nr_entries >= trace->max_entries;  in stack_trace_cb()
228 		.skip = trace->skip,  in save_stack_trace_tsk()
236 	save_stack_trace_tsk(current, trace);  in save_stack_trace()
251 	if (r->skip) {  in return_address_cb()
252 		--r->skip;  in return_address_cb()
255 	if (!kernel_text_address(frame->pc))  in return_address_cb()
257 	r->addr = frame->pc;  in return_address_cb()