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)  * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  * Copyright (C) 2013 Richard Weinberger <richard@nod.at>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * Copyright (C) 2014 Google Inc., Author: Daniel Walter <dwalter@google.com>
^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/kallsyms.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/stacktrace.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) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <asm/stacktrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) void dump_trace(struct task_struct *tsk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 		const struct stacktrace_ops *ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 		void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 	int reliable = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 	unsigned long *sp, bp, addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	struct pt_regs *segv_regs = tsk->thread.segv_regs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 	struct stack_frame *frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	bp = get_frame_pointer(tsk, segv_regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 	sp = get_stack_pointer(tsk, segv_regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	frame = (struct stack_frame *)bp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	while (((long) sp & (THREAD_SIZE-1)) != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 		addr = *sp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 		if (__kernel_text_address(addr)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 			reliable = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 			if ((unsigned long) sp == bp + sizeof(long)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 				frame = frame ? frame->next_frame : NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 				bp = (unsigned long)frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 				reliable = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 			ops->address(data, addr, reliable);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 		sp++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	}
^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) static void save_addr(void *data, unsigned long address, int reliable)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	struct stack_trace *trace = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	if (!reliable)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 	if (trace->nr_entries >= trace->max_entries)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 	trace->entries[trace->nr_entries++] = address;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) static const struct stacktrace_ops dump_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 	.address = save_addr
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) static void __save_stack_trace(struct task_struct *tsk, struct stack_trace *trace)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 	dump_trace(tsk, &dump_ops, trace);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) void save_stack_trace(struct stack_trace *trace)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 	__save_stack_trace(current, trace);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) EXPORT_SYMBOL_GPL(save_stack_trace);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) 	__save_stack_trace(tsk, trace);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) EXPORT_SYMBOL_GPL(save_stack_trace_tsk);