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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