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1 | /* SPDX-License-Identifier: GPL-2.0 */ |
---|---|
2 | /* |
3 | * Copyright (C) 1999, 2000 Niibe Yutaka |
4 | */ |
5 | #ifndef __ASM_SH_PTRACE_H |
6 | #define __ASM_SH_PTRACE_H |
7 | |
8 | |
9 | #include <linux/stringify.h> |
10 | #include <linux/stddef.h> |
11 | #include <linux/thread_info.h> |
12 | #include <asm/addrspace.h> |
13 | #include <asm/page.h> |
14 | #include <uapi/asm/ptrace.h> |
15 | |
16 | #define user_mode(regs) (((regs)->sr & 0x40000000)==0) |
17 | #define kernel_stack_pointer(_regs) ((unsigned long)(_regs)->regs[15]) |
18 | |
19 | static inline unsigned long instruction_pointer(struct pt_regs *regs) |
20 | { |
21 | return regs->pc; |
22 | } |
23 | static inline void instruction_pointer_set(struct pt_regs *regs, |
24 | unsigned long val) |
25 | { |
26 | regs->pc = val; |
27 | } |
28 | |
29 | static inline unsigned long frame_pointer(struct pt_regs *regs) |
30 | { |
31 | return regs->regs[14]; |
32 | } |
33 | |
34 | static inline unsigned long user_stack_pointer(struct pt_regs *regs) |
35 | { |
36 | return regs->regs[15]; |
37 | } |
38 | |
39 | static inline void user_stack_pointer_set(struct pt_regs *regs, |
40 | unsigned long val) |
41 | { |
42 | regs->regs[15] = val; |
43 | } |
44 | |
45 | #define arch_has_single_step() (1) |
46 | |
47 | /* |
48 | * kprobe-based event tracer support |
49 | */ |
50 | struct pt_regs_offset { |
51 | const char *name; |
52 | int offset; |
53 | }; |
54 | |
55 | #define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)} |
56 | #define REGS_OFFSET_NAME(num) \ |
57 | {.name = __stringify(r##num), .offset = offsetof(struct pt_regs, regs[num])} |
58 | #define TREGS_OFFSET_NAME(num) \ |
59 | {.name = __stringify(tr##num), .offset = offsetof(struct pt_regs, tregs[num])} |
60 | #define REG_OFFSET_END {.name = NULL, .offset = 0} |
61 | |
62 | /* Query offset/name of register from its name/offset */ |
63 | extern int regs_query_register_offset(const char *name); |
64 | extern const char *regs_query_register_name(unsigned int offset); |
65 | |
66 | extern const struct pt_regs_offset regoffset_table[]; |
67 | |
68 | /** |
69 | * regs_get_register() - get register value from its offset |
70 | * @regs: pt_regs from which register value is gotten. |
71 | * @offset: offset number of the register. |
72 | * |
73 | * regs_get_register returns the value of a register. The @offset is the |
74 | * offset of the register in struct pt_regs address which specified by @regs. |
75 | * If @offset is bigger than MAX_REG_OFFSET, this returns 0. |
76 | */ |
77 | static inline unsigned long regs_get_register(struct pt_regs *regs, |
78 | unsigned int offset) |
79 | { |
80 | if (unlikely(offset > MAX_REG_OFFSET)) |
81 | return 0; |
82 | return *(unsigned long *)((unsigned long)regs + offset); |
83 | } |
84 | |
85 | /** |
86 | * regs_within_kernel_stack() - check the address in the stack |
87 | * @regs: pt_regs which contains kernel stack pointer. |
88 | * @addr: address which is checked. |
89 | * |
90 | * regs_within_kernel_stack() checks @addr is within the kernel stack page(s). |
91 | * If @addr is within the kernel stack, it returns true. If not, returns false. |
92 | */ |
93 | static inline int regs_within_kernel_stack(struct pt_regs *regs, |
94 | unsigned long addr) |
95 | { |
96 | return ((addr & ~(THREAD_SIZE - 1)) == |
97 | (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1))); |
98 | } |
99 | |
100 | /** |
101 | * regs_get_kernel_stack_nth() - get Nth entry of the stack |
102 | * @regs: pt_regs which contains kernel stack pointer. |
103 | * @n: stack entry number. |
104 | * |
105 | * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which |
106 | * is specified by @regs. If the @n th entry is NOT in the kernel stack, |
107 | * this returns 0. |
108 | */ |
109 | static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, |
110 | unsigned int n) |
111 | { |
112 | unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs); |
113 | addr += n; |
114 | if (regs_within_kernel_stack(regs, (unsigned long)addr)) |
115 | return *addr; |
116 | else |
117 | return 0; |
118 | } |
119 | |
120 | struct perf_event; |
121 | struct perf_sample_data; |
122 | |
123 | extern void ptrace_triggered(struct perf_event *bp, |
124 | struct perf_sample_data *data, struct pt_regs *regs); |
125 | |
126 | #define task_pt_regs(task) \ |
127 | ((struct pt_regs *) (task_stack_page(task) + THREAD_SIZE) - 1) |
128 | |
129 | static inline unsigned long profile_pc(struct pt_regs *regs) |
130 | { |
131 | unsigned long pc = regs->pc; |
132 | |
133 | if (virt_addr_uncached(pc)) |
134 | return CAC_ADDR(pc); |
135 | |
136 | return pc; |
137 | } |
138 | |
139 | #endif /* __ASM_SH_PTRACE_H */ |
140 |
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