Linux kernel mirror (for testing)
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linux
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
20extern void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk,
21 const char *loglvl);
22
23DECLARE_PER_CPU(unsigned long *, irq_stack_ptr);
24
25static 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
36static 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
42static 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
53static 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
62DECLARE_PER_CPU(unsigned long [OVERFLOW_STACK_SIZE/sizeof(long)], overflow_stack);
63
64static inline struct stack_info stackinfo_get_overflow(void)
65{
66 unsigned long low = (unsigned long)raw_cpu_ptr(overflow_stack);
67 unsigned long high = low + OVERFLOW_STACK_SIZE;
68
69 return (struct stack_info) {
70 .low = low,
71 .high = high,
72 };
73}
74
75#if defined(CONFIG_ARM_SDE_INTERFACE)
76DECLARE_PER_CPU(unsigned long *, sdei_stack_normal_ptr);
77DECLARE_PER_CPU(unsigned long *, sdei_stack_critical_ptr);
78
79static inline struct stack_info stackinfo_get_sdei_normal(void)
80{
81 unsigned long low = (unsigned long)raw_cpu_read(sdei_stack_normal_ptr);
82 unsigned long high = low + SDEI_STACK_SIZE;
83
84 return (struct stack_info) {
85 .low = low,
86 .high = high,
87 };
88}
89
90static inline struct stack_info stackinfo_get_sdei_critical(void)
91{
92 unsigned long low = (unsigned long)raw_cpu_read(sdei_stack_critical_ptr);
93 unsigned long high = low + SDEI_STACK_SIZE;
94
95 return (struct stack_info) {
96 .low = low,
97 .high = high,
98 };
99}
100#else
101#define stackinfo_get_sdei_normal() stackinfo_get_unknown()
102#define stackinfo_get_sdei_critical() stackinfo_get_unknown()
103#endif
104
105#ifdef CONFIG_EFI
106extern u64 *efi_rt_stack_top;
107
108static inline struct stack_info stackinfo_get_efi(void)
109{
110 unsigned long high = (u64)efi_rt_stack_top;
111 unsigned long low = high - THREAD_SIZE;
112
113 return (struct stack_info) {
114 .low = low,
115 .high = high,
116 };
117}
118#endif
119
120#endif /* __ASM_STACKTRACE_H */