1 #ifndef __PARISC_UACCESS_H 2 #define __PARISC_UACCESS_H 3 4 /* 5 * User space memory access functions 6 */ 7 #include <asm/page.h> 8 #include <asm/cache.h> 9 #include <asm/errno.h> 10 #include <asm-generic/uaccess-unaligned.h> 11 12 #define VERIFY_READ 0 13 #define VERIFY_WRITE 1 14 15 #define KERNEL_DS ((mm_segment_t){0}) 16 #define USER_DS ((mm_segment_t){1}) 17 18 #define segment_eq(a,b) ((a).seg == (b).seg) 19 20 #define get_ds() (KERNEL_DS) 21 #define get_fs() (current_thread_info()->addr_limit) 22 #define set_fs(x) (current_thread_info()->addr_limit = (x)) 23 24 /* 25 * Note that since kernel addresses are in a separate address space on 26 * parisc, we don't need to do anything for access_ok(). 27 * We just let the page fault handler do the right thing. This also means 28 * that put_user is the same as __put_user, etc. 29 */ 30 31 extern int __get_kernel_bad(void); 32 extern int __get_user_bad(void); 33 extern int __put_kernel_bad(void); 34 extern int __put_user_bad(void); 35 36 static inline long access_ok(int type, const void __user * addr, 37 unsigned long size) 38 { 39 return 1; 40 } 41 42 #define put_user __put_user 43 #define get_user __get_user 44 45 #if !defined(CONFIG_64BIT) 46 #define LDD_KERNEL(ptr) __get_kernel_bad(); 47 #define LDD_USER(ptr) __get_user_bad(); 48 #define STD_KERNEL(x, ptr) __put_kernel_asm64(x,ptr) 49 #define STD_USER(x, ptr) __put_user_asm64(x,ptr) 50 #define ASM_WORD_INSN ".word\t" 51 #else 52 #define LDD_KERNEL(ptr) __get_kernel_asm("ldd",ptr) 53 #define LDD_USER(ptr) __get_user_asm("ldd",ptr) 54 #define STD_KERNEL(x, ptr) __put_kernel_asm("std",x,ptr) 55 #define STD_USER(x, ptr) __put_user_asm("std",x,ptr) 56 #define ASM_WORD_INSN ".dword\t" 57 #endif 58 59 /* 60 * The exception table contains two values: the first is an address 61 * for an instruction that is allowed to fault, and the second is 62 * the address to the fixup routine. 63 */ 64 65 struct exception_table_entry { 66 unsigned long insn; /* address of insn that is allowed to fault. */ 67 long fixup; /* fixup routine */ 68 }; 69 70 #define ASM_EXCEPTIONTABLE_ENTRY( fault_addr, except_addr )\ 71 ".section __ex_table,\"aw\"\n" \ 72 ASM_WORD_INSN #fault_addr ", " #except_addr "\n\t" \ 73 ".previous\n" 74 75 /* 76 * The page fault handler stores, in a per-cpu area, the following information 77 * if a fixup routine is available. 78 */ 79 struct exception_data { 80 unsigned long fault_ip; 81 unsigned long fault_space; 82 unsigned long fault_addr; 83 }; 84 85 #define __get_user(x,ptr) \ 86 ({ \ 87 register long __gu_err __asm__ ("r8") = 0; \ 88 register long __gu_val __asm__ ("r9") = 0; \ 89 \ 90 if (segment_eq(get_fs(),KERNEL_DS)) { \ 91 switch (sizeof(*(ptr))) { \ 92 case 1: __get_kernel_asm("ldb",ptr); break; \ 93 case 2: __get_kernel_asm("ldh",ptr); break; \ 94 case 4: __get_kernel_asm("ldw",ptr); break; \ 95 case 8: LDD_KERNEL(ptr); break; \ 96 default: __get_kernel_bad(); break; \ 97 } \ 98 } \ 99 else { \ 100 switch (sizeof(*(ptr))) { \ 101 case 1: __get_user_asm("ldb",ptr); break; \ 102 case 2: __get_user_asm("ldh",ptr); break; \ 103 case 4: __get_user_asm("ldw",ptr); break; \ 104 case 8: LDD_USER(ptr); break; \ 105 default: __get_user_bad(); break; \ 106 } \ 107 } \ 108 \ 109 (x) = (__typeof__(*(ptr))) __gu_val; \ 110 __gu_err; \ 111 }) 112 113 #define __get_kernel_asm(ldx,ptr) \ 114 __asm__("\n1:\t" ldx "\t0(%2),%0\n\t" \ 115 ASM_EXCEPTIONTABLE_ENTRY(1b, fixup_get_user_skip_1)\ 116 : "=r"(__gu_val), "=r"(__gu_err) \ 117 : "r"(ptr), "1"(__gu_err) \ 118 : "r1"); 119 120 #define __get_user_asm(ldx,ptr) \ 121 __asm__("\n1:\t" ldx "\t0(%%sr3,%2),%0\n\t" \ 122 ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_get_user_skip_1)\ 123 : "=r"(__gu_val), "=r"(__gu_err) \ 124 : "r"(ptr), "1"(__gu_err) \ 125 : "r1"); 126 127 #define __put_user(x,ptr) \ 128 ({ \ 129 register long __pu_err __asm__ ("r8") = 0; \ 130 __typeof__(*(ptr)) __x = (__typeof__(*(ptr)))(x); \ 131 \ 132 if (segment_eq(get_fs(),KERNEL_DS)) { \ 133 switch (sizeof(*(ptr))) { \ 134 case 1: __put_kernel_asm("stb",__x,ptr); break; \ 135 case 2: __put_kernel_asm("sth",__x,ptr); break; \ 136 case 4: __put_kernel_asm("stw",__x,ptr); break; \ 137 case 8: STD_KERNEL(__x,ptr); break; \ 138 default: __put_kernel_bad(); break; \ 139 } \ 140 } \ 141 else { \ 142 switch (sizeof(*(ptr))) { \ 143 case 1: __put_user_asm("stb",__x,ptr); break; \ 144 case 2: __put_user_asm("sth",__x,ptr); break; \ 145 case 4: __put_user_asm("stw",__x,ptr); break; \ 146 case 8: STD_USER(__x,ptr); break; \ 147 default: __put_user_bad(); break; \ 148 } \ 149 } \ 150 \ 151 __pu_err; \ 152 }) 153 154 /* 155 * The "__put_user/kernel_asm()" macros tell gcc they read from memory 156 * instead of writing. This is because they do not write to any memory 157 * gcc knows about, so there are no aliasing issues. These macros must 158 * also be aware that "fixup_put_user_skip_[12]" are executed in the 159 * context of the fault, and any registers used there must be listed 160 * as clobbers. In this case only "r1" is used by the current routines. 161 * r8/r9 are already listed as err/val. 162 */ 163 164 #define __put_kernel_asm(stx,x,ptr) \ 165 __asm__ __volatile__ ( \ 166 "\n1:\t" stx "\t%2,0(%1)\n\t" \ 167 ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_1)\ 168 : "=r"(__pu_err) \ 169 : "r"(ptr), "r"(x), "0"(__pu_err) \ 170 : "r1") 171 172 #define __put_user_asm(stx,x,ptr) \ 173 __asm__ __volatile__ ( \ 174 "\n1:\t" stx "\t%2,0(%%sr3,%1)\n\t" \ 175 ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_1)\ 176 : "=r"(__pu_err) \ 177 : "r"(ptr), "r"(x), "0"(__pu_err) \ 178 : "r1") 179 180 181 #if !defined(CONFIG_64BIT) 182 183 #define __put_kernel_asm64(__val,ptr) do { \ 184 __asm__ __volatile__ ( \ 185 "\n1:\tstw %2,0(%1)" \ 186 "\n2:\tstw %R2,4(%1)\n\t" \ 187 ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_2)\ 188 ASM_EXCEPTIONTABLE_ENTRY(2b,fixup_put_user_skip_1)\ 189 : "=r"(__pu_err) \ 190 : "r"(ptr), "r"(__val), "0"(__pu_err) \ 191 : "r1"); \ 192 } while (0) 193 194 #define __put_user_asm64(__val,ptr) do { \ 195 __asm__ __volatile__ ( \ 196 "\n1:\tstw %2,0(%%sr3,%1)" \ 197 "\n2:\tstw %R2,4(%%sr3,%1)\n\t" \ 198 ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_2)\ 199 ASM_EXCEPTIONTABLE_ENTRY(2b,fixup_put_user_skip_1)\ 200 : "=r"(__pu_err) \ 201 : "r"(ptr), "r"(__val), "0"(__pu_err) \ 202 : "r1"); \ 203 } while (0) 204 205 #endif /* !defined(CONFIG_64BIT) */ 206 207 208 /* 209 * Complex access routines -- external declarations 210 */ 211 212 extern unsigned long lcopy_to_user(void __user *, const void *, unsigned long); 213 extern unsigned long lcopy_from_user(void *, const void __user *, unsigned long); 214 extern unsigned long lcopy_in_user(void __user *, const void __user *, unsigned long); 215 extern long strncpy_from_user(char *, const char __user *, long); 216 extern unsigned lclear_user(void __user *,unsigned long); 217 extern long lstrnlen_user(const char __user *,long); 218 /* 219 * Complex access routines -- macros 220 */ 221 #define user_addr_max() (~0UL) 222 223 #define strnlen_user lstrnlen_user 224 #define strlen_user(str) lstrnlen_user(str, 0x7fffffffL) 225 #define clear_user lclear_user 226 #define __clear_user lclear_user 227 228 unsigned long copy_to_user(void __user *dst, const void *src, unsigned long len); 229 #define __copy_to_user copy_to_user 230 unsigned long __copy_from_user(void *dst, const void __user *src, unsigned long len); 231 unsigned long copy_in_user(void __user *dst, const void __user *src, unsigned long len); 232 #define __copy_in_user copy_in_user 233 #define __copy_to_user_inatomic __copy_to_user 234 #define __copy_from_user_inatomic __copy_from_user 235 236 extern void copy_from_user_overflow(void) 237 #ifdef CONFIG_DEBUG_STRICT_USER_COPY_CHECKS 238 __compiletime_error("copy_from_user() buffer size is not provably correct") 239 #else 240 __compiletime_warning("copy_from_user() buffer size is not provably correct") 241 #endif 242 ; 243 244 static inline unsigned long __must_check copy_from_user(void *to, 245 const void __user *from, 246 unsigned long n) 247 { 248 int sz = __compiletime_object_size(to); 249 int ret = -EFAULT; 250 251 if (likely(sz == -1 || !__builtin_constant_p(n) || sz >= n)) 252 ret = __copy_from_user(to, from, n); 253 else 254 copy_from_user_overflow(); 255 256 return ret; 257 } 258 259 struct pt_regs; 260 int fixup_exception(struct pt_regs *regs); 261 262 #endif /* __PARISC_UACCESS_H */ 263