16  * Unwind the current stack frame and store the new register values in the
47 static int frame_pointer_check(struct stackframe *frame)  in frame_pointer_check()  argument
50 	unsigned long fp = frame->fp;  in frame_pointer_check()
51 	unsigned long pc = frame->pc;  in frame_pointer_check()
63 	low = frame->sp;  in frame_pointer_check()
66 	/* check current frame pointer is within bounds */  in frame_pointer_check()
78 int notrace unwind_frame(struct stackframe *frame)  in unwind_frame()  argument
80 	unsigned long fp = frame->fp;  in unwind_frame()
82 	if (frame_pointer_check(frame))  in unwind_frame()
89 	if (frame->ex_frame) {  in unwind_frame()
90 		struct pt_regs *regs = (struct pt_regs *)frame->sp;  in unwind_frame()
96 		 * when frame->ex_frame is a false positive.  in unwind_frame()
98 		if ((unsigned long)&regs[1] > ALIGN(frame->sp, THREAD_SIZE))  in unwind_frame()
101 		frame->pc = regs->ARM_pc;  in unwind_frame()
102 		frame->ex_frame = false;  in unwind_frame()
106 	/* restore the registers from the stack frame */  in unwind_frame()
108 	frame->sp = frame->fp;  in unwind_frame()
109 	frame->fp = READ_ONCE_NOCHECK(*(unsigned long *)(fp));  in unwind_frame()
110 	frame->pc = READ_ONCE_NOCHECK(*(unsigned long *)(fp + 4));  in unwind_frame()
112 	frame->fp = READ_ONCE_NOCHECK(*(unsigned long *)(fp - 12));  in unwind_frame()
113 	frame->sp = READ_ONCE_NOCHECK(*(unsigned long *)(fp - 8));  in unwind_frame()
114 	frame->pc = READ_ONCE_NOCHECK(*(unsigned long *)(fp - 4));  in unwind_frame()
117 	if (is_kretprobe_trampoline(frame->pc))  in unwind_frame()
118 		frame->pc = kretprobe_find_ret_addr(frame->tsk,  in unwind_frame()
119 					(void *)frame->fp, &frame->kr_cur);  in unwind_frame()
122 	if (in_entry_text(frame->pc))  in unwind_frame()
123 		frame->ex_frame = true;  in unwind_frame()
129 void notrace walk_stackframe(struct stackframe *frame,  in walk_stackframe()  argument
135 		if (fn(frame, data))  in walk_stackframe()
137 		ret = unwind_frame(frame);  in walk_stackframe()
151 static int save_trace(struct stackframe *frame, void *d)  in save_trace()  argument
155 	unsigned long addr = frame->pc;  in save_trace()
173 	struct stackframe frame;  in __save_stack_trace()  local
188 		frame.fp = thread_saved_fp(tsk);  in __save_stack_trace()
189 		frame.sp = thread_saved_sp(tsk);  in __save_stack_trace()
190 		frame.lr = 0;		/* recovered from the stack */  in __save_stack_trace()
191 		frame.pc = thread_saved_pc(tsk);  in __save_stack_trace()
196 		frame.fp = (unsigned long)__builtin_frame_address(0);  in __save_stack_trace()
197 		frame.sp = current_stack_pointer;  in __save_stack_trace()
198 		frame.lr = (unsigned long)__builtin_return_address(0);  in __save_stack_trace()
200 		frame.pc = (unsigned long)&&here;  in __save_stack_trace()
203 	frame.kr_cur = NULL;  in __save_stack_trace()
204 	frame.tsk = tsk;  in __save_stack_trace()
207 	frame.ex_frame = false;  in __save_stack_trace()
210 	walk_stackframe(&frame, save_trace, &data);  in __save_stack_trace()
216 	struct stackframe frame;  in save_stack_trace_regs()  local
222 	frame.fp = regs->ARM_fp;  in save_stack_trace_regs()
223 	frame.sp = regs->ARM_sp;  in save_stack_trace_regs()
224 	frame.lr = regs->ARM_lr;  in save_stack_trace_regs()
225 	frame.pc = regs->ARM_pc;  in save_stack_trace_regs()
227 	frame.kr_cur = NULL;  in save_stack_trace_regs()
228 	frame.tsk = current;  in save_stack_trace_regs()
231 	frame.ex_frame = in_entry_text(frame.pc);  in save_stack_trace_regs()
234 	walk_stackframe(&frame, save_trace, &data);  in save_stack_trace_regs()