/* *  Copyright (C) 1991, 1992  Linus Torvalds *  Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs *  Copyright (C) 2009  Matt Fleming */#include <linux/kallsyms.h>#include <linux/ftrace.h>#include <linux/debug_locks.h>#include <asm/unwinder.h>#include <asm/stacktrace.h> void printk_address(unsigned long address, int reliable){	printk(" [<%p>] %s%pS\n", (void *) address,			reliable ? "" : "? ", (void *) address);} #ifdef CONFIG_FUNCTION_GRAPH_TRACERstatic voidprint_ftrace_graph_addr(unsigned long addr, void *data,			const struct stacktrace_ops *ops,			struct thread_info *tinfo, int *graph){	struct task_struct *task = tinfo->task;	unsigned long ret_addr;	int index = task->curr_ret_stack; 	if (addr != (unsigned long)return_to_handler)		return; 	if (!task->ret_stack || index < *graph)		return; 	index -= *graph;	ret_addr = task->ret_stack[index].ret; 	ops->address(data, ret_addr, 1); 	(*graph)++;}#elsestatic inline voidprint_ftrace_graph_addr(unsigned long addr, void *data,			const struct stacktrace_ops *ops,			struct thread_info *tinfo, int *graph){ }#endif voidstack_reader_dump(struct task_struct *task, struct pt_regs *regs,		  unsigned long *sp, const struct stacktrace_ops *ops,		  void *data){	struct thread_info *context;	int graph = 0; 	context = (struct thread_info *)		((unsigned long)sp & (~(THREAD_SIZE - 1))); 	while (!kstack_end(sp)) {		unsigned long addr = *sp++; 		if (__kernel_text_address(addr)) {			ops->address(data, addr, 1); 			print_ftrace_graph_addr(addr, data, ops,						context, &graph);		}	}} static int print_trace_stack(void *data, char *name){	printk("%s <%s> ", (char *)data, name);	return 0;} /* * Print one address/symbol entries per line. */static void print_trace_address(void *data, unsigned long addr, int reliable){	printk(data);	printk_address(addr, reliable);} static const struct stacktrace_ops print_trace_ops = {	.stack = print_trace_stack,	.address = print_trace_address,}; void show_trace(struct task_struct *tsk, unsigned long *sp,		struct pt_regs *regs){	if (regs && user_mode(regs))		return; 	printk("\nCall trace:\n"); 	unwind_stack(tsk, regs, sp, &print_trace_ops, ""); 	printk("\n"); 	if (!tsk)		tsk = current; 	debug_show_held_locks(tsk);}