1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Copyright (C) 2012 ARM Ltd.
4  */
5 #ifndef __ASM_STACKTRACE_H
6 #define __ASM_STACKTRACE_H
7 
8 #include <linux/percpu.h>
9 #include <linux/sched.h>
10 #include <linux/sched/task_stack.h>
11 #include <linux/llist.h>
12 
13 #include <asm/memory.h>
14 #include <asm/pointer_auth.h>
15 #include <asm/ptrace.h>
16 #include <asm/sdei.h>
17 
18 #include <asm/stacktrace/common.h>
19 
20 extern void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk,
21 			   const char *loglvl);
22 
23 DECLARE_PER_CPU(unsigned long *, irq_stack_ptr);
24 
25 static inline struct stack_info stackinfo_get_irq(void)
26 {
27 	unsigned long low = (unsigned long)raw_cpu_read(irq_stack_ptr);
28 	unsigned long high = low + IRQ_STACK_SIZE;
29 
30 	return (struct stack_info) {
31 		.low = low,
32 		.high = high,
33 	};
34 }
35 
36 static inline bool on_irq_stack(unsigned long sp, unsigned long size)
37 {
38 	struct stack_info info = stackinfo_get_irq();
39 	return stackinfo_on_stack(&info, sp, size);
40 }
41 
42 static inline struct stack_info stackinfo_get_task(const struct task_struct *tsk)
43 {
44 	unsigned long low = (unsigned long)task_stack_page(tsk);
45 	unsigned long high = low + THREAD_SIZE;
46 
47 	return (struct stack_info) {
48 		.low = low,
49 		.high = high,
50 	};
51 }
52 
53 static inline bool on_task_stack(const struct task_struct *tsk,
54 				 unsigned long sp, unsigned long size)
55 {
56 	struct stack_info info = stackinfo_get_task(tsk);
57 	return stackinfo_on_stack(&info, sp, size);
58 }
59 
60 #ifdef CONFIG_VMAP_STACK
61 DECLARE_PER_CPU(unsigned long [OVERFLOW_STACK_SIZE/sizeof(long)], overflow_stack);
62 
63 static inline struct stack_info stackinfo_get_overflow(void)
64 {
65 	unsigned long low = (unsigned long)raw_cpu_ptr(overflow_stack);
66 	unsigned long high = low + OVERFLOW_STACK_SIZE;
67 
68 	return (struct stack_info) {
69 		.low = low,
70 		.high = high,
71 	};
72 }
73 #else
74 #define stackinfo_get_overflow()	stackinfo_get_unknown()
75 #endif
76 
77 #if defined(CONFIG_ARM_SDE_INTERFACE) && defined(CONFIG_VMAP_STACK)
78 DECLARE_PER_CPU(unsigned long *, sdei_stack_normal_ptr);
79 DECLARE_PER_CPU(unsigned long *, sdei_stack_critical_ptr);
80 
81 static inline struct stack_info stackinfo_get_sdei_normal(void)
82 {
83 	unsigned long low = (unsigned long)raw_cpu_read(sdei_stack_normal_ptr);
84 	unsigned long high = low + SDEI_STACK_SIZE;
85 
86 	return (struct stack_info) {
87 		.low = low,
88 		.high = high,
89 	};
90 }
91 
92 static inline struct stack_info stackinfo_get_sdei_critical(void)
93 {
94 	unsigned long low = (unsigned long)raw_cpu_read(sdei_stack_critical_ptr);
95 	unsigned long high = low + SDEI_STACK_SIZE;
96 
97 	return (struct stack_info) {
98 		.low = low,
99 		.high = high,
100 	};
101 }
102 #else
103 #define stackinfo_get_sdei_normal()	stackinfo_get_unknown()
104 #define stackinfo_get_sdei_critical()	stackinfo_get_unknown()
105 #endif
106 
107 #endif	/* __ASM_STACKTRACE_H */
108