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Diffstat (limited to 'arch/arm/include/asm/uaccess.h')
-rw-r--r--arch/arm/include/asm/uaccess.h58
1 files changed, 43 insertions, 15 deletions
diff --git a/arch/arm/include/asm/uaccess.h b/arch/arm/include/asm/uaccess.h
index 479a6352e0b5..77bd79f2ffdb 100644
--- a/arch/arm/include/asm/uaccess.h
+++ b/arch/arm/include/asm/uaccess.h
@@ -101,28 +101,39 @@ extern int __get_user_1(void *);
101extern int __get_user_2(void *); 101extern int __get_user_2(void *);
102extern int __get_user_4(void *); 102extern int __get_user_4(void *);
103 103
104#define __get_user_x(__r2,__p,__e,__s,__i...) \ 104#define __GUP_CLOBBER_1 "lr", "cc"
105#ifdef CONFIG_CPU_USE_DOMAINS
106#define __GUP_CLOBBER_2 "ip", "lr", "cc"
107#else
108#define __GUP_CLOBBER_2 "lr", "cc"
109#endif
110#define __GUP_CLOBBER_4 "lr", "cc"
111
112#define __get_user_x(__r2,__p,__e,__l,__s) \
105 __asm__ __volatile__ ( \ 113 __asm__ __volatile__ ( \
106 __asmeq("%0", "r0") __asmeq("%1", "r2") \ 114 __asmeq("%0", "r0") __asmeq("%1", "r2") \
115 __asmeq("%3", "r1") \
107 "bl __get_user_" #__s \ 116 "bl __get_user_" #__s \
108 : "=&r" (__e), "=r" (__r2) \ 117 : "=&r" (__e), "=r" (__r2) \
109 : "0" (__p) \ 118 : "0" (__p), "r" (__l) \
110 : __i, "cc") 119 : __GUP_CLOBBER_##__s)
111 120
112#define get_user(x,p) \ 121#define __get_user_check(x,p) \
113 ({ \ 122 ({ \
123 unsigned long __limit = current_thread_info()->addr_limit - 1; \
114 register const typeof(*(p)) __user *__p asm("r0") = (p);\ 124 register const typeof(*(p)) __user *__p asm("r0") = (p);\
115 register unsigned long __r2 asm("r2"); \ 125 register unsigned long __r2 asm("r2"); \
126 register unsigned long __l asm("r1") = __limit; \
116 register int __e asm("r0"); \ 127 register int __e asm("r0"); \
117 switch (sizeof(*(__p))) { \ 128 switch (sizeof(*(__p))) { \
118 case 1: \ 129 case 1: \
119 __get_user_x(__r2, __p, __e, 1, "lr"); \ 130 __get_user_x(__r2, __p, __e, __l, 1); \
120 break; \ 131 break; \
121 case 2: \ 132 case 2: \
122 __get_user_x(__r2, __p, __e, 2, "r3", "lr"); \ 133 __get_user_x(__r2, __p, __e, __l, 2); \
123 break; \ 134 break; \
124 case 4: \ 135 case 4: \
125 __get_user_x(__r2, __p, __e, 4, "lr"); \ 136 __get_user_x(__r2, __p, __e, __l, 4); \
126 break; \ 137 break; \
127 default: __e = __get_user_bad(); break; \ 138 default: __e = __get_user_bad(); break; \
128 } \ 139 } \
@@ -130,42 +141,57 @@ extern int __get_user_4(void *);
130 __e; \ 141 __e; \
131 }) 142 })
132 143
144#define get_user(x,p) \
145 ({ \
146 might_fault(); \
147 __get_user_check(x,p); \
148 })
149
133extern int __put_user_1(void *, unsigned int); 150extern int __put_user_1(void *, unsigned int);
134extern int __put_user_2(void *, unsigned int); 151extern int __put_user_2(void *, unsigned int);
135extern int __put_user_4(void *, unsigned int); 152extern int __put_user_4(void *, unsigned int);
136extern int __put_user_8(void *, unsigned long long); 153extern int __put_user_8(void *, unsigned long long);
137 154
138#define __put_user_x(__r2,__p,__e,__s) \ 155#define __put_user_x(__r2,__p,__e,__l,__s) \
139 __asm__ __volatile__ ( \ 156 __asm__ __volatile__ ( \
140 __asmeq("%0", "r0") __asmeq("%2", "r2") \ 157 __asmeq("%0", "r0") __asmeq("%2", "r2") \
158 __asmeq("%3", "r1") \
141 "bl __put_user_" #__s \ 159 "bl __put_user_" #__s \
142 : "=&r" (__e) \ 160 : "=&r" (__e) \
143 : "0" (__p), "r" (__r2) \ 161 : "0" (__p), "r" (__r2), "r" (__l) \
144 : "ip", "lr", "cc") 162 : "ip", "lr", "cc")
145 163
146#define put_user(x,p) \ 164#define __put_user_check(x,p) \
147 ({ \ 165 ({ \
166 unsigned long __limit = current_thread_info()->addr_limit - 1; \
148 register const typeof(*(p)) __r2 asm("r2") = (x); \ 167 register const typeof(*(p)) __r2 asm("r2") = (x); \
149 register const typeof(*(p)) __user *__p asm("r0") = (p);\ 168 register const typeof(*(p)) __user *__p asm("r0") = (p);\
169 register unsigned long __l asm("r1") = __limit; \
150 register int __e asm("r0"); \ 170 register int __e asm("r0"); \
151 switch (sizeof(*(__p))) { \ 171 switch (sizeof(*(__p))) { \
152 case 1: \ 172 case 1: \
153 __put_user_x(__r2, __p, __e, 1); \ 173 __put_user_x(__r2, __p, __e, __l, 1); \
154 break; \ 174 break; \
155 case 2: \ 175 case 2: \
156 __put_user_x(__r2, __p, __e, 2); \ 176 __put_user_x(__r2, __p, __e, __l, 2); \
157 break; \ 177 break; \
158 case 4: \ 178 case 4: \
159 __put_user_x(__r2, __p, __e, 4); \ 179 __put_user_x(__r2, __p, __e, __l, 4); \
160 break; \ 180 break; \
161 case 8: \ 181 case 8: \
162 __put_user_x(__r2, __p, __e, 8); \ 182 __put_user_x(__r2, __p, __e, __l, 8); \
163 break; \ 183 break; \
164 default: __e = __put_user_bad(); break; \ 184 default: __e = __put_user_bad(); break; \
165 } \ 185 } \
166 __e; \ 186 __e; \
167 }) 187 })
168 188
189#define put_user(x,p) \
190 ({ \
191 might_fault(); \
192 __put_user_check(x,p); \
193 })
194
169#else /* CONFIG_MMU */ 195#else /* CONFIG_MMU */
170 196
171/* 197/*
@@ -219,6 +245,7 @@ do { \
219 unsigned long __gu_addr = (unsigned long)(ptr); \ 245 unsigned long __gu_addr = (unsigned long)(ptr); \
220 unsigned long __gu_val; \ 246 unsigned long __gu_val; \
221 __chk_user_ptr(ptr); \ 247 __chk_user_ptr(ptr); \
248 might_fault(); \
222 switch (sizeof(*(ptr))) { \ 249 switch (sizeof(*(ptr))) { \
223 case 1: __get_user_asm_byte(__gu_val,__gu_addr,err); break; \ 250 case 1: __get_user_asm_byte(__gu_val,__gu_addr,err); break; \
224 case 2: __get_user_asm_half(__gu_val,__gu_addr,err); break; \ 251 case 2: __get_user_asm_half(__gu_val,__gu_addr,err); break; \
@@ -300,6 +327,7 @@ do { \
300 unsigned long __pu_addr = (unsigned long)(ptr); \ 327 unsigned long __pu_addr = (unsigned long)(ptr); \
301 __typeof__(*(ptr)) __pu_val = (x); \ 328 __typeof__(*(ptr)) __pu_val = (x); \
302 __chk_user_ptr(ptr); \ 329 __chk_user_ptr(ptr); \
330 might_fault(); \
303 switch (sizeof(*(ptr))) { \ 331 switch (sizeof(*(ptr))) { \
304 case 1: __put_user_asm_byte(__pu_val,__pu_addr,err); break; \ 332 case 1: __put_user_asm_byte(__pu_val,__pu_addr,err); break; \
305 case 2: __put_user_asm_half(__pu_val,__pu_addr,err); break; \ 333 case 2: __put_user_asm_half(__pu_val,__pu_addr,err); break; \
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