/* * Copyright (C) 2012 ARM Ltd. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program.  If not, see <http://www.gnu.org/licenses/>. */#ifndef __ASM_STACKTRACE_H#define __ASM_STACKTRACE_H #include <linux/percpu.h>#include <linux/sched.h>#include <linux/sched/task_stack.h> #include <asm/memory.h>#include <asm/ptrace.h>#include <asm/sdei.h> struct stackframe {	unsigned long fp;	unsigned long pc;#ifdef CONFIG_FUNCTION_GRAPH_TRACER	int graph;#endif}; enum stack_type {	STACK_TYPE_UNKNOWN,	STACK_TYPE_TASK,	STACK_TYPE_IRQ,	STACK_TYPE_OVERFLOW,	STACK_TYPE_SDEI_NORMAL,	STACK_TYPE_SDEI_CRITICAL,}; struct stack_info {	unsigned long low;	unsigned long high;	enum stack_type type;}; extern int unwind_frame(struct task_struct *tsk, struct stackframe *frame);extern void walk_stackframe(struct task_struct *tsk, struct stackframe *frame,			    int (*fn)(struct stackframe *, void *), void *data);extern void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk); DECLARE_PER_CPU(unsigned long *, irq_stack_ptr); static inline bool on_irq_stack(unsigned long sp,				struct stack_info *info){	unsigned long low = (unsigned long)raw_cpu_read(irq_stack_ptr);	unsigned long high = low + IRQ_STACK_SIZE; 	if (!low)		return false; 	if (sp < low || sp >= high)		return false; 	if (info) {		info->low = low;		info->high = high;		info->type = STACK_TYPE_IRQ;	} 	return true;} static inline bool on_task_stack(struct task_struct *tsk, unsigned long sp,				struct stack_info *info){	unsigned long low = (unsigned long)task_stack_page(tsk);	unsigned long high = low + THREAD_SIZE; 	if (sp < low || sp >= high)		return false; 	if (info) {		info->low = low;		info->high = high;		info->type = STACK_TYPE_TASK;	} 	return true;} #ifdef CONFIG_VMAP_STACKDECLARE_PER_CPU(unsigned long [OVERFLOW_STACK_SIZE/sizeof(long)], overflow_stack); static inline bool on_overflow_stack(unsigned long sp,				struct stack_info *info){	unsigned long low = (unsigned long)raw_cpu_ptr(overflow_stack);	unsigned long high = low + OVERFLOW_STACK_SIZE; 	if (sp < low || sp >= high)		return false; 	if (info) {		info->low = low;		info->high = high;		info->type = STACK_TYPE_OVERFLOW;	} 	return true;}#elsestatic inline bool on_overflow_stack(unsigned long sp,			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(struct task_struct *tsk,					unsigned long sp,					struct stack_info *info){	if (on_task_stack(tsk, sp, info))		return true;	if (tsk != current || preemptible())		return false;	if (on_irq_stack(sp, info))		return true;	if (on_overflow_stack(sp, info))		return true;	if (on_sdei_stack(sp, info))		return true; 	return false;} #endif	/* __ASM_STACKTRACE_H */