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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_UACCESS_H
3#define _ASM_UACCESS_H
4
5/*
6 * User space memory access functions
7 */
8
9#include <linux/compiler.h>
10#include <linux/string.h>
11#include <linux/mm_types.h>
12#include <asm/asi.h>
13#include <asm/spitfire.h>
14#include <asm/pgtable.h>
15
16#include <asm/processor.h>
17#include <asm-generic/access_ok.h>
18
19/*
20 * Sparc64 is segmented, though more like the M68K than the I386.
21 * We use the secondary ASI to address user memory, which references a
22 * completely different VM map, thus there is zero chance of the user
23 * doing something queer and tricking us into poking kernel memory.
24 */
25
26/*
27 * Test whether a block of memory is a valid user space address.
28 * Returns 0 if the range is valid, nonzero otherwise.
29 */
30static inline bool __chk_range_not_ok(unsigned long addr, unsigned long size, unsigned long limit)
31{
32 if (__builtin_constant_p(size))
33 return addr > limit - size;
34
35 addr += size;
36 if (addr < size)
37 return true;
38
39 return addr > limit;
40}
41
42#define __range_not_ok(addr, size, limit) \
43({ \
44 __chk_user_ptr(addr); \
45 __chk_range_not_ok((unsigned long __force)(addr), size, limit); \
46})
47
48void __retl_efault(void);
49
50/* Uh, these should become the main single-value transfer routines..
51 * They automatically use the right size if we just have the right
52 * pointer type..
53 *
54 * This gets kind of ugly. We want to return _two_ values in "get_user()"
55 * and yet we don't want to do any pointers, because that is too much
56 * of a performance impact. Thus we have a few rather ugly macros here,
57 * and hide all the ugliness from the user.
58 */
59#define put_user(x, ptr) ({ \
60 unsigned long __pu_addr = (unsigned long)(ptr); \
61 __chk_user_ptr(ptr); \
62 __put_user_nocheck((__typeof__(*(ptr)))(x), __pu_addr, sizeof(*(ptr)));\
63})
64
65#define get_user(x, ptr) ({ \
66 unsigned long __gu_addr = (unsigned long)(ptr); \
67 __chk_user_ptr(ptr); \
68 __get_user_nocheck((x), __gu_addr, sizeof(*(ptr)), __typeof__(*(ptr)));\
69})
70
71#define __put_user(x, ptr) put_user(x, ptr)
72#define __get_user(x, ptr) get_user(x, ptr)
73
74struct __large_struct { unsigned long buf[100]; };
75#define __m(x) ((struct __large_struct *)(x))
76
77#define __put_kernel_nofault(dst, src, type, label) \
78do { \
79 type *addr = (type __force *)(dst); \
80 type data = *(type *)src; \
81 register int __pu_ret; \
82 switch (sizeof(type)) { \
83 case 1: __put_kernel_asm(data, b, addr, __pu_ret); break; \
84 case 2: __put_kernel_asm(data, h, addr, __pu_ret); break; \
85 case 4: __put_kernel_asm(data, w, addr, __pu_ret); break; \
86 case 8: __put_kernel_asm(data, x, addr, __pu_ret); break; \
87 default: __pu_ret = __put_user_bad(); break; \
88 } \
89 if (__pu_ret) \
90 goto label; \
91} while (0)
92
93#define __put_kernel_asm(x, size, addr, ret) \
94__asm__ __volatile__( \
95 "/* Put kernel asm, inline. */\n" \
96 "1:\t" "st"#size " %1, [%2]\n\t" \
97 "clr %0\n" \
98 "2:\n\n\t" \
99 ".section .fixup,#alloc,#execinstr\n\t" \
100 ".align 4\n" \
101 "3:\n\t" \
102 "sethi %%hi(2b), %0\n\t" \
103 "jmpl %0 + %%lo(2b), %%g0\n\t" \
104 " mov %3, %0\n\n\t" \
105 ".previous\n\t" \
106 ".section __ex_table,\"a\"\n\t" \
107 ".align 4\n\t" \
108 ".word 1b, 3b\n\t" \
109 ".previous\n\n\t" \
110 : "=r" (ret) : "r" (x), "r" (__m(addr)), \
111 "i" (-EFAULT))
112
113#define __put_user_nocheck(data, addr, size) ({ \
114 register int __pu_ret; \
115 switch (size) { \
116 case 1: __put_user_asm(data, b, addr, __pu_ret); break; \
117 case 2: __put_user_asm(data, h, addr, __pu_ret); break; \
118 case 4: __put_user_asm(data, w, addr, __pu_ret); break; \
119 case 8: __put_user_asm(data, x, addr, __pu_ret); break; \
120 default: __pu_ret = __put_user_bad(); break; \
121 } \
122 __pu_ret; \
123})
124
125#define __put_user_asm(x, size, addr, ret) \
126__asm__ __volatile__( \
127 "/* Put user asm, inline. */\n" \
128 "1:\t" "st"#size "a %1, [%2] %%asi\n\t" \
129 "clr %0\n" \
130 "2:\n\n\t" \
131 ".section .fixup,#alloc,#execinstr\n\t" \
132 ".align 4\n" \
133 "3:\n\t" \
134 "sethi %%hi(2b), %0\n\t" \
135 "jmpl %0 + %%lo(2b), %%g0\n\t" \
136 " mov %3, %0\n\n\t" \
137 ".previous\n\t" \
138 ".section __ex_table,\"a\"\n\t" \
139 ".align 4\n\t" \
140 ".word 1b, 3b\n\t" \
141 ".previous\n\n\t" \
142 : "=r" (ret) : "r" (x), "r" (__m(addr)), \
143 "i" (-EFAULT))
144
145int __put_user_bad(void);
146
147#define __get_kernel_nofault(dst, src, type, label) \
148do { \
149 type *addr = (type __force *)(src); \
150 register int __gu_ret; \
151 register unsigned long __gu_val; \
152 switch (sizeof(type)) { \
153 case 1: __get_kernel_asm(__gu_val, ub, addr, __gu_ret); break; \
154 case 2: __get_kernel_asm(__gu_val, uh, addr, __gu_ret); break; \
155 case 4: __get_kernel_asm(__gu_val, uw, addr, __gu_ret); break; \
156 case 8: __get_kernel_asm(__gu_val, x, addr, __gu_ret); break; \
157 default: \
158 __gu_val = 0; \
159 __gu_ret = __get_user_bad(); \
160 break; \
161 } \
162 if (__gu_ret) \
163 goto label; \
164 *(type *)dst = (__force type) __gu_val; \
165} while (0)
166#define __get_kernel_asm(x, size, addr, ret) \
167__asm__ __volatile__( \
168 "/* Get kernel asm, inline. */\n" \
169 "1:\t" "ld"#size " [%2], %1\n\t" \
170 "clr %0\n" \
171 "2:\n\n\t" \
172 ".section .fixup,#alloc,#execinstr\n\t" \
173 ".align 4\n" \
174 "3:\n\t" \
175 "sethi %%hi(2b), %0\n\t" \
176 "clr %1\n\t" \
177 "jmpl %0 + %%lo(2b), %%g0\n\t" \
178 " mov %3, %0\n\n\t" \
179 ".previous\n\t" \
180 ".section __ex_table,\"a\"\n\t" \
181 ".align 4\n\t" \
182 ".word 1b, 3b\n\n\t" \
183 ".previous\n\t" \
184 : "=r" (ret), "=r" (x) : "r" (__m(addr)), \
185 "i" (-EFAULT))
186
187#define __get_user_nocheck(data, addr, size, type) ({ \
188 register int __gu_ret; \
189 register unsigned long __gu_val; \
190 switch (size) { \
191 case 1: __get_user_asm(__gu_val, ub, addr, __gu_ret); break; \
192 case 2: __get_user_asm(__gu_val, uh, addr, __gu_ret); break; \
193 case 4: __get_user_asm(__gu_val, uw, addr, __gu_ret); break; \
194 case 8: __get_user_asm(__gu_val, x, addr, __gu_ret); break; \
195 default: \
196 __gu_val = 0; \
197 __gu_ret = __get_user_bad(); \
198 break; \
199 } \
200 data = (__force type) __gu_val; \
201 __gu_ret; \
202})
203
204#define __get_user_asm(x, size, addr, ret) \
205__asm__ __volatile__( \
206 "/* Get user asm, inline. */\n" \
207 "1:\t" "ld"#size "a [%2] %%asi, %1\n\t" \
208 "clr %0\n" \
209 "2:\n\n\t" \
210 ".section .fixup,#alloc,#execinstr\n\t" \
211 ".align 4\n" \
212 "3:\n\t" \
213 "sethi %%hi(2b), %0\n\t" \
214 "clr %1\n\t" \
215 "jmpl %0 + %%lo(2b), %%g0\n\t" \
216 " mov %3, %0\n\n\t" \
217 ".previous\n\t" \
218 ".section __ex_table,\"a\"\n\t" \
219 ".align 4\n\t" \
220 ".word 1b, 3b\n\n\t" \
221 ".previous\n\t" \
222 : "=r" (ret), "=r" (x) : "r" (__m(addr)), \
223 "i" (-EFAULT))
224
225int __get_user_bad(void);
226
227unsigned long __must_check raw_copy_from_user(void *to,
228 const void __user *from,
229 unsigned long size);
230
231unsigned long __must_check raw_copy_to_user(void __user *to,
232 const void *from,
233 unsigned long size);
234#define INLINE_COPY_FROM_USER
235#define INLINE_COPY_TO_USER
236
237unsigned long __must_check raw_copy_in_user(void __user *to,
238 const void __user *from,
239 unsigned long size);
240
241unsigned long __must_check __clear_user(void __user *, unsigned long);
242
243#define clear_user __clear_user
244
245__must_check long strnlen_user(const char __user *str, long n);
246
247struct pt_regs;
248unsigned long compute_effective_address(struct pt_regs *,
249 unsigned int insn,
250 unsigned int rd);
251
252#endif /* _ASM_UACCESS_H */
1#ifndef _ASM_UACCESS_H
2#define _ASM_UACCESS_H
3
4/*
5 * User space memory access functions
6 */
7
8#ifdef __KERNEL__
9#include <linux/errno.h>
10#include <linux/compiler.h>
11#include <linux/string.h>
12#include <linux/thread_info.h>
13#include <asm/asi.h>
14#include <asm/spitfire.h>
15#include <asm-generic/uaccess-unaligned.h>
16#include <asm/extable_64.h>
17#endif
18
19#ifndef __ASSEMBLY__
20
21#include <asm/processor.h>
22
23/*
24 * Sparc64 is segmented, though more like the M68K than the I386.
25 * We use the secondary ASI to address user memory, which references a
26 * completely different VM map, thus there is zero chance of the user
27 * doing something queer and tricking us into poking kernel memory.
28 *
29 * What is left here is basically what is needed for the other parts of
30 * the kernel that expect to be able to manipulate, erum, "segments".
31 * Or perhaps more properly, permissions.
32 *
33 * "For historical reasons, these macros are grossly misnamed." -Linus
34 */
35
36#define KERNEL_DS ((mm_segment_t) { ASI_P })
37#define USER_DS ((mm_segment_t) { ASI_AIUS }) /* har har har */
38
39#define VERIFY_READ 0
40#define VERIFY_WRITE 1
41
42#define get_fs() ((mm_segment_t){(current_thread_info()->current_ds)})
43#define get_ds() (KERNEL_DS)
44
45#define segment_eq(a, b) ((a).seg == (b).seg)
46
47#define set_fs(val) \
48do { \
49 current_thread_info()->current_ds = (val).seg; \
50 __asm__ __volatile__ ("wr %%g0, %0, %%asi" : : "r" ((val).seg)); \
51} while(0)
52
53/*
54 * Test whether a block of memory is a valid user space address.
55 * Returns 0 if the range is valid, nonzero otherwise.
56 */
57static inline bool __chk_range_not_ok(unsigned long addr, unsigned long size, unsigned long limit)
58{
59 if (__builtin_constant_p(size))
60 return addr > limit - size;
61
62 addr += size;
63 if (addr < size)
64 return true;
65
66 return addr > limit;
67}
68
69#define __range_not_ok(addr, size, limit) \
70({ \
71 __chk_user_ptr(addr); \
72 __chk_range_not_ok((unsigned long __force)(addr), size, limit); \
73})
74
75static inline int __access_ok(const void __user * addr, unsigned long size)
76{
77 return 1;
78}
79
80static inline int access_ok(int type, const void __user * addr, unsigned long size)
81{
82 return 1;
83}
84
85void __retl_efault(void);
86
87/* Uh, these should become the main single-value transfer routines..
88 * They automatically use the right size if we just have the right
89 * pointer type..
90 *
91 * This gets kind of ugly. We want to return _two_ values in "get_user()"
92 * and yet we don't want to do any pointers, because that is too much
93 * of a performance impact. Thus we have a few rather ugly macros here,
94 * and hide all the ugliness from the user.
95 */
96#define put_user(x, ptr) ({ \
97 unsigned long __pu_addr = (unsigned long)(ptr); \
98 __chk_user_ptr(ptr); \
99 __put_user_nocheck((__typeof__(*(ptr)))(x), __pu_addr, sizeof(*(ptr)));\
100})
101
102#define get_user(x, ptr) ({ \
103 unsigned long __gu_addr = (unsigned long)(ptr); \
104 __chk_user_ptr(ptr); \
105 __get_user_nocheck((x), __gu_addr, sizeof(*(ptr)), __typeof__(*(ptr)));\
106})
107
108#define __put_user(x, ptr) put_user(x, ptr)
109#define __get_user(x, ptr) get_user(x, ptr)
110
111struct __large_struct { unsigned long buf[100]; };
112#define __m(x) ((struct __large_struct *)(x))
113
114#define __put_user_nocheck(data, addr, size) ({ \
115 register int __pu_ret; \
116 switch (size) { \
117 case 1: __put_user_asm(data, b, addr, __pu_ret); break; \
118 case 2: __put_user_asm(data, h, addr, __pu_ret); break; \
119 case 4: __put_user_asm(data, w, addr, __pu_ret); break; \
120 case 8: __put_user_asm(data, x, addr, __pu_ret); break; \
121 default: __pu_ret = __put_user_bad(); break; \
122 } \
123 __pu_ret; \
124})
125
126#define __put_user_asm(x, size, addr, ret) \
127__asm__ __volatile__( \
128 "/* Put user asm, inline. */\n" \
129 "1:\t" "st"#size "a %1, [%2] %%asi\n\t" \
130 "clr %0\n" \
131 "2:\n\n\t" \
132 ".section .fixup,#alloc,#execinstr\n\t" \
133 ".align 4\n" \
134 "3:\n\t" \
135 "sethi %%hi(2b), %0\n\t" \
136 "jmpl %0 + %%lo(2b), %%g0\n\t" \
137 " mov %3, %0\n\n\t" \
138 ".previous\n\t" \
139 ".section __ex_table,\"a\"\n\t" \
140 ".align 4\n\t" \
141 ".word 1b, 3b\n\t" \
142 ".previous\n\n\t" \
143 : "=r" (ret) : "r" (x), "r" (__m(addr)), \
144 "i" (-EFAULT))
145
146int __put_user_bad(void);
147
148#define __get_user_nocheck(data, addr, size, type) ({ \
149 register int __gu_ret; \
150 register unsigned long __gu_val; \
151 switch (size) { \
152 case 1: __get_user_asm(__gu_val, ub, addr, __gu_ret); break; \
153 case 2: __get_user_asm(__gu_val, uh, addr, __gu_ret); break; \
154 case 4: __get_user_asm(__gu_val, uw, addr, __gu_ret); break; \
155 case 8: __get_user_asm(__gu_val, x, addr, __gu_ret); break; \
156 default: \
157 __gu_val = 0; \
158 __gu_ret = __get_user_bad(); \
159 break; \
160 } \
161 data = (__force type) __gu_val; \
162 __gu_ret; \
163})
164
165#define __get_user_asm(x, size, addr, ret) \
166__asm__ __volatile__( \
167 "/* Get user asm, inline. */\n" \
168 "1:\t" "ld"#size "a [%2] %%asi, %1\n\t" \
169 "clr %0\n" \
170 "2:\n\n\t" \
171 ".section .fixup,#alloc,#execinstr\n\t" \
172 ".align 4\n" \
173 "3:\n\t" \
174 "sethi %%hi(2b), %0\n\t" \
175 "clr %1\n\t" \
176 "jmpl %0 + %%lo(2b), %%g0\n\t" \
177 " mov %3, %0\n\n\t" \
178 ".previous\n\t" \
179 ".section __ex_table,\"a\"\n\t" \
180 ".align 4\n\t" \
181 ".word 1b, 3b\n\n\t" \
182 ".previous\n\t" \
183 : "=r" (ret), "=r" (x) : "r" (__m(addr)), \
184 "i" (-EFAULT))
185
186int __get_user_bad(void);
187
188unsigned long __must_check ___copy_from_user(void *to,
189 const void __user *from,
190 unsigned long size);
191static inline unsigned long __must_check
192copy_from_user(void *to, const void __user *from, unsigned long size)
193{
194 check_object_size(to, size, false);
195
196 return ___copy_from_user(to, from, size);
197}
198#define __copy_from_user copy_from_user
199
200unsigned long __must_check ___copy_to_user(void __user *to,
201 const void *from,
202 unsigned long size);
203static inline unsigned long __must_check
204copy_to_user(void __user *to, const void *from, unsigned long size)
205{
206 check_object_size(from, size, true);
207
208 return ___copy_to_user(to, from, size);
209}
210#define __copy_to_user copy_to_user
211
212unsigned long __must_check ___copy_in_user(void __user *to,
213 const void __user *from,
214 unsigned long size);
215static inline unsigned long __must_check
216copy_in_user(void __user *to, void __user *from, unsigned long size)
217{
218 return ___copy_in_user(to, from, size);
219}
220#define __copy_in_user copy_in_user
221
222unsigned long __must_check __clear_user(void __user *, unsigned long);
223
224#define clear_user __clear_user
225
226__must_check long strlen_user(const char __user *str);
227__must_check long strnlen_user(const char __user *str, long n);
228
229#define __copy_to_user_inatomic __copy_to_user
230#define __copy_from_user_inatomic __copy_from_user
231
232struct pt_regs;
233unsigned long compute_effective_address(struct pt_regs *,
234 unsigned int insn,
235 unsigned int rd);
236
237#endif /* __ASSEMBLY__ */
238
239#endif /* _ASM_UACCESS_H */