43 int notrace unwind_frame(struct task_struct *tsk, struct stackframe *frame)  in unwind_frame()  argument
45 	unsigned long fp = frame->fp;  in unwind_frame()
56 	frame->fp = READ_ONCE_NOCHECK(*(unsigned long *)(fp));  in unwind_frame()
57 	frame->pc = READ_ONCE_NOCHECK(*(unsigned long *)(fp + 8));  in unwind_frame()
61 			(frame->pc == (unsigned long)return_to_handler)) {  in unwind_frame()
62 		if (WARN_ON_ONCE(frame->graph == -1))  in unwind_frame()
64 		if (frame->graph < -1)  in unwind_frame()
65 			frame->graph += FTRACE_NOTRACE_DEPTH;  in unwind_frame()
73 		frame->pc = tsk->ret_stack[frame->graph--].ret;  in unwind_frame()
83 	if (!frame->fp && !frame->pc)  in unwind_frame()
89 void notrace walk_stackframe(struct task_struct *tsk, struct stackframe *frame,  in walk_stackframe()  argument
95 		if (fn(frame, data))  in walk_stackframe()
97 		ret = unwind_frame(tsk, frame);  in walk_stackframe()
110 static int save_trace(struct stackframe *frame, void *d)  in save_trace()  argument
114 	unsigned long addr = frame->pc;  in save_trace()
131 	struct stackframe frame;  in save_stack_trace_regs()  local
137 	frame.fp = regs->regs[29];  in save_stack_trace_regs()
138 	frame.pc = regs->pc;  in save_stack_trace_regs()
140 	frame.graph = current->curr_ret_stack;  in save_stack_trace_regs()
143 	walk_stackframe(current, &frame, save_trace, &data);  in save_stack_trace_regs()
152 	struct stackframe frame;  in __save_stack_trace()  local
162 		frame.fp = thread_saved_fp(tsk);  in __save_stack_trace()
163 		frame.pc = thread_saved_pc(tsk);  in __save_stack_trace()
167 		frame.fp = (unsigned long)__builtin_frame_address(0);  in __save_stack_trace()
168 		frame.pc = (unsigned long)__save_stack_trace;  in __save_stack_trace()
171 	frame.graph = tsk->curr_ret_stack;  in __save_stack_trace()
174 	walk_stackframe(tsk, &frame, save_trace, &data);  in __save_stack_trace()