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 #define on_thread_stack()	(on_task_stack(current, current_stack_pointer, 1))
61 
62 #ifdef CONFIG_VMAP_STACK
63 DECLARE_PER_CPU(unsigned long [OVERFLOW_STACK_SIZE/sizeof(long)], overflow_stack);
64 
65 static inline struct stack_info stackinfo_get_overflow(void)
66 {
67 	unsigned long low = (unsigned long)raw_cpu_ptr(overflow_stack);
68 	unsigned long high = low + OVERFLOW_STACK_SIZE;
69 
70 	return (struct stack_info) {
71 		.low = low,
72 		.high = high,
73 	};
74 }
75 #else
76 #define stackinfo_get_overflow()	stackinfo_get_unknown()
77 #endif
78 
79 #if defined(CONFIG_ARM_SDE_INTERFACE) && defined(CONFIG_VMAP_STACK)
80 DECLARE_PER_CPU(unsigned long *, sdei_stack_normal_ptr);
81 DECLARE_PER_CPU(unsigned long *, sdei_stack_critical_ptr);
82 
83 static inline struct stack_info stackinfo_get_sdei_normal(void)
84 {
85 	unsigned long low = (unsigned long)raw_cpu_read(sdei_stack_normal_ptr);
86 	unsigned long high = low + SDEI_STACK_SIZE;
87 
88 	return (struct stack_info) {
89 		.low = low,
90 		.high = high,
91 	};
92 }
93 
94 static inline struct stack_info stackinfo_get_sdei_critical(void)
95 {
96 	unsigned long low = (unsigned long)raw_cpu_read(sdei_stack_critical_ptr);
97 	unsigned long high = low + SDEI_STACK_SIZE;
98 
99 	return (struct stack_info) {
100 		.low = low,
101 		.high = high,
102 	};
103 }
104 #else
105 #define stackinfo_get_sdei_normal()	stackinfo_get_unknown()
106 #define stackinfo_get_sdei_critical()	stackinfo_get_unknown()
107 #endif
108 
109 #ifdef CONFIG_EFI
110 extern u64 *efi_rt_stack_top;
111 
112 static inline struct stack_info stackinfo_get_efi(void)
113 {
114 	unsigned long high = (u64)efi_rt_stack_top;
115 	unsigned long low = high - THREAD_SIZE;
116 
117 	return (struct stack_info) {
118 		.low = low,
119 		.high = high,
120 	};
121 }
122 #endif
123 
124 #endif	/* __ASM_STACKTRACE_H */
125