1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
|
/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef _ASM_POWERPC_INST_H
#define _ASM_POWERPC_INST_H
#include <asm/ppc-opcode.h>
#include <asm/reg.h>
#include <asm/disassemble.h>
#include <asm/uaccess.h>
#define ___get_user_instr(gu_op, dest, ptr) \
({ \
long __gui_ret; \
u32 __user *__gui_ptr = (u32 __user *)ptr; \
ppc_inst_t __gui_inst; \
unsigned int __prefix, __suffix; \
\
__chk_user_ptr(ptr); \
__gui_ret = gu_op(__prefix, __gui_ptr); \
if (__gui_ret == 0) { \
if (IS_ENABLED(CONFIG_PPC64) && (__prefix >> 26) == OP_PREFIX) { \
__gui_ret = gu_op(__suffix, __gui_ptr + 1); \
__gui_inst = ppc_inst_prefix(__prefix, __suffix); \
} else { \
__gui_inst = ppc_inst(__prefix); \
} \
if (__gui_ret == 0) \
(dest) = __gui_inst; \
} \
__gui_ret; \
})
#define get_user_instr(x, ptr) ___get_user_instr(get_user, x, ptr)
#define __get_user_instr(x, ptr) ___get_user_instr(__get_user, x, ptr)
/*
* Instruction data type for POWER
*/
#if defined(CONFIG_PPC64) || defined(__CHECKER__)
static inline u32 ppc_inst_val(ppc_inst_t x)
{
return x.val;
}
#define ppc_inst(x) ((ppc_inst_t){ .val = (x) })
#else
static inline u32 ppc_inst_val(ppc_inst_t x)
{
return x;
}
#define ppc_inst(x) (x)
#endif
static inline int ppc_inst_primary_opcode(ppc_inst_t x)
{
return ppc_inst_val(x) >> 26;
}
#ifdef CONFIG_PPC64
#define ppc_inst_prefix(x, y) ((ppc_inst_t){ .val = (x), .suffix = (y) })
static inline u32 ppc_inst_suffix(ppc_inst_t x)
{
return x.suffix;
}
#else
#define ppc_inst_prefix(x, y) ((void)y, ppc_inst(x))
static inline u32 ppc_inst_suffix(ppc_inst_t x)
{
return 0;
}
#endif /* CONFIG_PPC64 */
static inline ppc_inst_t ppc_inst_read(const u32 *ptr)
{
if (IS_ENABLED(CONFIG_PPC64) && (*ptr >> 26) == OP_PREFIX)
return ppc_inst_prefix(*ptr, *(ptr + 1));
else
return ppc_inst(*ptr);
}
static inline bool ppc_inst_prefixed(ppc_inst_t x)
{
return IS_ENABLED(CONFIG_PPC64) && ppc_inst_primary_opcode(x) == OP_PREFIX;
}
static inline ppc_inst_t ppc_inst_swab(ppc_inst_t x)
{
return ppc_inst_prefix(swab32(ppc_inst_val(x)), swab32(ppc_inst_suffix(x)));
}
static inline bool ppc_inst_equal(ppc_inst_t x, ppc_inst_t y)
{
if (ppc_inst_val(x) != ppc_inst_val(y))
return false;
if (!ppc_inst_prefixed(x))
return true;
return ppc_inst_suffix(x) == ppc_inst_suffix(y);
}
static inline int ppc_inst_len(ppc_inst_t x)
{
return ppc_inst_prefixed(x) ? 8 : 4;
}
/*
* Return the address of the next instruction, if the instruction @value was
* located at @location.
*/
static inline u32 *ppc_inst_next(u32 *location, u32 *value)
{
ppc_inst_t tmp;
tmp = ppc_inst_read(value);
return (void *)location + ppc_inst_len(tmp);
}
static inline unsigned long ppc_inst_as_ulong(ppc_inst_t x)
{
if (IS_ENABLED(CONFIG_PPC32))
return ppc_inst_val(x);
else if (IS_ENABLED(CONFIG_CPU_LITTLE_ENDIAN))
return (u64)ppc_inst_suffix(x) << 32 | ppc_inst_val(x);
else
return (u64)ppc_inst_val(x) << 32 | ppc_inst_suffix(x);
}
static inline void ppc_inst_write(u32 *ptr, ppc_inst_t x)
{
if (!ppc_inst_prefixed(x))
*ptr = ppc_inst_val(x);
else
*(u64 *)ptr = ppc_inst_as_ulong(x);
}
#define PPC_INST_STR_LEN sizeof("00000000 00000000")
static inline char *__ppc_inst_as_str(char str[PPC_INST_STR_LEN], ppc_inst_t x)
{
if (ppc_inst_prefixed(x))
sprintf(str, "%08x %08x", ppc_inst_val(x), ppc_inst_suffix(x));
else
sprintf(str, "%08x", ppc_inst_val(x));
return str;
}
#define ppc_inst_as_str(x) \
({ \
char __str[PPC_INST_STR_LEN]; \
__ppc_inst_as_str(__str, x); \
__str; \
})
static inline int __copy_inst_from_kernel_nofault(ppc_inst_t *inst, u32 *src)
{
unsigned int val, suffix;
/* See https://github.com/ClangBuiltLinux/linux/issues/1521 */
#if defined(CONFIG_CC_IS_CLANG) && CONFIG_CLANG_VERSION < 140000
val = suffix = 0;
#endif
__get_kernel_nofault(&val, src, u32, Efault);
if (IS_ENABLED(CONFIG_PPC64) && get_op(val) == OP_PREFIX) {
__get_kernel_nofault(&suffix, src + 1, u32, Efault);
*inst = ppc_inst_prefix(val, suffix);
} else {
*inst = ppc_inst(val);
}
return 0;
Efault:
return -EFAULT;
}
static inline int copy_inst_from_kernel_nofault(ppc_inst_t *inst, u32 *src)
{
if (unlikely(!is_kernel_addr((unsigned long)src)))
return -ERANGE;
return __copy_inst_from_kernel_nofault(inst, src);
}
#endif /* _ASM_POWERPC_INST_H */
|
