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