/* SPDX-License-Identifier: GPL-2.0-only *//* * Copyright (C) 2012 ARM Ltd. */#ifndef __ASM_STACKTRACE_H#define __ASM_STACKTRACE_H #include <linux/percpu.h>#include <linux/sched.h>#include <linux/sched/task_stack.h>#include <linux/types.h>#include <linux/llist.h> #include <asm/memory.h>#include <asm/ptrace.h>#include <asm/sdei.h> enum stack_type {	STACK_TYPE_UNKNOWN,	STACK_TYPE_TASK,	STACK_TYPE_IRQ,	STACK_TYPE_OVERFLOW,	STACK_TYPE_SDEI_NORMAL,	STACK_TYPE_SDEI_CRITICAL,	__NR_STACK_TYPES}; struct stack_info {	unsigned long low;	unsigned long high;	enum stack_type type;}; extern void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk,			   const char *loglvl); DECLARE_PER_CPU(unsigned long *, irq_stack_ptr); static inline bool on_stack(unsigned long sp, unsigned long size,			    unsigned long low, unsigned long high,			    enum stack_type type, struct stack_info *info){	if (!low)		return false; 	if (sp < low || sp + size < sp || sp + size > high)		return false; 	if (info) {		info->low = low;		info->high = high;		info->type = type;	}	return true;} static inline bool on_irq_stack(unsigned long sp, unsigned long size,				struct stack_info *info){	unsigned long low = (unsigned long)raw_cpu_read(irq_stack_ptr);	unsigned long high = low + IRQ_STACK_SIZE; 	return on_stack(sp, size, low, high, STACK_TYPE_IRQ, info);} static inline bool on_task_stack(const struct task_struct *tsk,				 unsigned long sp, unsigned long size,				 struct stack_info *info){	unsigned long low = (unsigned long)task_stack_page(tsk);	unsigned long high = low + THREAD_SIZE; 	return on_stack(sp, size, low, high, STACK_TYPE_TASK, info);} #ifdef CONFIG_VMAP_STACKDECLARE_PER_CPU(unsigned long [OVERFLOW_STACK_SIZE/sizeof(long)], overflow_stack); static inline bool on_overflow_stack(unsigned long sp, unsigned long size,				struct stack_info *info){	unsigned long low = (unsigned long)raw_cpu_ptr(overflow_stack);	unsigned long high = low + OVERFLOW_STACK_SIZE; 	return on_stack(sp, size, low, high, STACK_TYPE_OVERFLOW, info);}#elsestatic inline bool on_overflow_stack(unsigned long sp, unsigned long size,			struct stack_info *info) { return false; }#endif  /* * We can only safely access per-cpu stacks from current in a non-preemptible * context. */static inline bool on_accessible_stack(const struct task_struct *tsk,				       unsigned long sp, unsigned long size,				       struct stack_info *info){	if (info)		info->type = STACK_TYPE_UNKNOWN; 	if (on_task_stack(tsk, sp, size, info))		return true;	if (tsk != current || preemptible())		return false;	if (on_irq_stack(sp, size, info))		return true;	if (on_overflow_stack(sp, size, info))		return true;	if (on_sdei_stack(sp, size, info))		return true; 	return false;} #endif	/* __ASM_STACKTRACE_H */