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[mirror_ubuntu-disco-kernel.git] / arch / x86 / include / asm / unwind.h
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b2441318 1/* SPDX-License-Identifier: GPL-2.0 */
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2#ifndef _ASM_X86_UNWIND_H
3#define _ASM_X86_UNWIND_H
4
5#include <linux/sched.h>
6#include <linux/ftrace.h>
7#include <asm/ptrace.h>
8#include <asm/stacktrace.h>
9
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10#define IRET_FRAME_OFFSET (offsetof(struct pt_regs, ip))
11#define IRET_FRAME_SIZE (sizeof(struct pt_regs) - IRET_FRAME_OFFSET)
12
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13struct unwind_state {
14 struct stack_info stack_info;
15 unsigned long stack_mask;
16 struct task_struct *task;
17 int graph_idx;
af085d90 18 bool error;
11af8474 19#if defined(CONFIG_UNWINDER_ORC)
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20 bool signal, full_regs;
21 unsigned long sp, bp, ip;
22 struct pt_regs *regs;
11af8474 23#elif defined(CONFIG_UNWINDER_FRAME_POINTER)
a8b7a923 24 bool got_irq;
ee9f8fce 25 unsigned long *bp, *orig_sp, ip;
946c1911 26 struct pt_regs *regs;
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27#else
28 unsigned long *sp;
29#endif
30};
31
32void __unwind_start(struct unwind_state *state, struct task_struct *task,
33 struct pt_regs *regs, unsigned long *first_frame);
7c7900f8 34bool unwind_next_frame(struct unwind_state *state);
cfee9edd 35unsigned long unwind_get_return_address(struct unwind_state *state);
ee9f8fce 36unsigned long *unwind_get_return_address_ptr(struct unwind_state *state);
cfee9edd 37
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38static inline bool unwind_done(struct unwind_state *state)
39{
40 return state->stack_info.type == STACK_TYPE_UNKNOWN;
41}
42
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43static inline bool unwind_error(struct unwind_state *state)
44{
45 return state->error;
46}
47
7c7900f8 48static inline
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49void unwind_start(struct unwind_state *state, struct task_struct *task,
50 struct pt_regs *regs, unsigned long *first_frame)
7c7900f8 51{
ee9f8fce 52 first_frame = first_frame ? : get_stack_pointer(task, regs);
7c7900f8 53
ee9f8fce 54 __unwind_start(state, task, regs, first_frame);
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55}
56
11af8474 57#if defined(CONFIG_UNWINDER_ORC) || defined(CONFIG_UNWINDER_FRAME_POINTER)
b02fcf9b 58/*
a9cdbe72 59 * If 'partial' returns true, only the iret frame registers are valid.
b02fcf9b 60 */
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61static inline struct pt_regs *unwind_get_entry_regs(struct unwind_state *state,
62 bool *partial)
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63{
64 if (unwind_done(state))
65 return NULL;
66
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67 if (partial) {
68#ifdef CONFIG_UNWINDER_ORC
69 *partial = !state->full_regs;
70#else
71 *partial = false;
72#endif
73 }
74
946c1911 75 return state->regs;
7c7900f8 76}
ee9f8fce 77#else
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78static inline struct pt_regs *unwind_get_entry_regs(struct unwind_state *state,
79 bool *partial)
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80{
81 return NULL;
82}
ee9f8fce 83#endif
7c7900f8 84
11af8474 85#ifdef CONFIG_UNWINDER_ORC
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86void unwind_init(void);
87void unwind_module_init(struct module *mod, void *orc_ip, size_t orc_ip_size,
88 void *orc, size_t orc_size);
89#else
90static inline void unwind_init(void) {}
91static inline
92void unwind_module_init(struct module *mod, void *orc_ip, size_t orc_ip_size,
93 void *orc, size_t orc_size) {}
94#endif
95
96/*
97 * This disables KASAN checking when reading a value from another task's stack,
98 * since the other task could be running on another CPU and could have poisoned
99 * the stack in the meantime.
100 */
101#define READ_ONCE_TASK_STACK(task, x) \
102({ \
103 unsigned long val; \
104 if (task == current) \
105 val = READ_ONCE(x); \
106 else \
107 val = READ_ONCE_NOCHECK(x); \
108 val; \
109})
110
111static inline bool task_on_another_cpu(struct task_struct *task)
946c1911 112{
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113#ifdef CONFIG_SMP
114 return task != current && task->on_cpu;
115#else
116 return false;
117#endif
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118}
119
7c7900f8 120#endif /* _ASM_X86_UNWIND_H */