1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Copyright (C) 2012 ARM Ltd.
5 #ifndef __ASM_STACKTRACE_H
6 #define __ASM_STACKTRACE_H
8 #include <linux/percpu.h>
9 #include <linux/sched.h>
10 #include <linux/sched/task_stack.h>
11 #include <linux/types.h>
12 #include <linux/llist.h>
14 #include <asm/memory.h>
15 #include <asm/ptrace.h>
23 STACK_TYPE_SDEI_NORMAL,
24 STACK_TYPE_SDEI_CRITICAL,
34 extern void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk,
37 DECLARE_PER_CPU(unsigned long *, irq_stack_ptr);
39 static inline bool on_stack(unsigned long sp, unsigned long size,
40 unsigned long low, unsigned long high,
41 enum stack_type type, struct stack_info *info)
46 if (sp < low || sp + size < sp || sp + size > high)
57 static inline bool on_irq_stack(unsigned long sp, unsigned long size,
58 struct stack_info *info)
60 unsigned long low = (unsigned long)raw_cpu_read(irq_stack_ptr);
61 unsigned long high = low + IRQ_STACK_SIZE;
63 return on_stack(sp, size, low, high, STACK_TYPE_IRQ, info);
66 static inline bool on_task_stack(const struct task_struct *tsk,
67 unsigned long sp, unsigned long size,
68 struct stack_info *info)
70 unsigned long low = (unsigned long)task_stack_page(tsk);
71 unsigned long high = low + THREAD_SIZE;
73 return on_stack(sp, size, low, high, STACK_TYPE_TASK, info);
76 #ifdef CONFIG_VMAP_STACK
77 DECLARE_PER_CPU(unsigned long [OVERFLOW_STACK_SIZE/sizeof(long)], overflow_stack);
79 static inline bool on_overflow_stack(unsigned long sp, unsigned long size,
80 struct stack_info *info)
82 unsigned long low = (unsigned long)raw_cpu_ptr(overflow_stack);
83 unsigned long high = low + OVERFLOW_STACK_SIZE;
85 return on_stack(sp, size, low, high, STACK_TYPE_OVERFLOW, info);
88 static inline bool on_overflow_stack(unsigned long sp, unsigned long size,
89 struct stack_info *info) { return false; }
94 * We can only safely access per-cpu stacks from current in a non-preemptible
97 static inline bool on_accessible_stack(const struct task_struct *tsk,
98 unsigned long sp, unsigned long size,
99 struct stack_info *info)
102 info->type = STACK_TYPE_UNKNOWN;
104 if (on_task_stack(tsk, sp, size, info))
106 if (tsk != current || preemptible())
108 if (on_irq_stack(sp, size, info))
110 if (on_overflow_stack(sp, size, info))
112 if (on_sdei_stack(sp, size, info))
118 #endif /* __ASM_STACKTRACE_H */