Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * Stacktrace support for Hexagon
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <linux/sched/task_stack.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/stacktrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/thread_info.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) struct stackframe {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 	unsigned long fp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 	unsigned long rets;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)  * Save stack-backtrace addresses into a stack_trace buffer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) void save_stack_trace(struct stack_trace *trace)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 	unsigned long low, high;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	unsigned long fp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 	struct stackframe *frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	int skip = trace->skip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	low = (unsigned long)task_stack_page(current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	high = low + THREAD_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	fp = (unsigned long)__builtin_frame_address(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	while (fp >= low && fp <= (high - sizeof(*frame))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 		frame = (struct stackframe *)fp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 		if (skip) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 			skip--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 			trace->entries[trace->nr_entries++] = frame->rets;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 			if (trace->nr_entries >= trace->max_entries)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 				break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 		 * The next frame must be at a higher address than the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 		 * current frame.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 		low = fp + sizeof(*frame);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 		fp = frame->fp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) EXPORT_SYMBOL_GPL(save_stack_trace);