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
stackinfo_get_irq(void)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
on_irq_stack(unsigned long sp,unsigned long size)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
stackinfo_get_task(const struct task_struct * tsk)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
on_task_stack(const struct task_struct * tsk,unsigned long sp,unsigned long size)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
stackinfo_get_overflow(void)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
stackinfo_get_sdei_normal(void)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
stackinfo_get_sdei_critical(void)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
