Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) // Copyright (C) 2005-2017 Andes Technology Corporation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) #include <linux/sched/debug.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) #include <linux/sched/task_stack.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) #include <linux/stacktrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) #include <linux/ftrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) void save_stack_trace(struct stack_trace *trace)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) 	save_stack_trace_tsk(current, trace);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) EXPORT_SYMBOL_GPL(save_stack_trace);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 	unsigned long *fpn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 	int skip = trace->skip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 	int savesched;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 	int graph_idx = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	if (tsk == current) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 		__asm__ __volatile__("\tori\t%0, $fp, #0\n":"=r"(fpn));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 		savesched = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 		fpn = (unsigned long *)thread_saved_fp(tsk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 		savesched = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	while (!kstack_end(fpn) && !((unsigned long)fpn & 0x3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	       && (fpn >= (unsigned long *)TASK_SIZE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 		unsigned long lpp, fpp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 		lpp = fpn[LP_OFFSET];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 		fpp = fpn[FP_OFFSET];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 		if (!__kernel_text_address(lpp))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 			lpp = ftrace_graph_ret_addr(tsk, &graph_idx, lpp, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 		if (savesched || !in_sched_functions(lpp)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 			if (skip) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 				skip--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 			} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 				trace->entries[trace->nr_entries++] = lpp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 				if (trace->nr_entries >= trace->max_entries)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 					break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 		fpn = (unsigned long *)fpp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) EXPORT_SYMBOL_GPL(save_stack_trace_tsk);