Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef __PARISC_UACCESS_H |
| 2 | #define __PARISC_UACCESS_H |
| 3 | |
| 4 | /* |
| 5 | * User space memory access functions |
| 6 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | #include <asm/page.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | #include <asm/cache.h> |
Helge Deller | 888c31f | 2010-02-01 19:56:33 +0000 | [diff] [blame] | 9 | #include <asm/errno.h> |
Arnd Bergmann | 5b17e1c | 2009-05-13 22:56:30 +0000 | [diff] [blame] | 10 | #include <asm-generic/uaccess-unaligned.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | |
Helge Deller | 8dd95c6 | 2014-10-21 21:29:09 +0200 | [diff] [blame] | 12 | #include <linux/bug.h> |
| 13 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #define VERIFY_READ 0 |
| 15 | #define VERIFY_WRITE 1 |
| 16 | |
| 17 | #define KERNEL_DS ((mm_segment_t){0}) |
| 18 | #define USER_DS ((mm_segment_t){1}) |
| 19 | |
| 20 | #define segment_eq(a,b) ((a).seg == (b).seg) |
| 21 | |
| 22 | #define get_ds() (KERNEL_DS) |
| 23 | #define get_fs() (current_thread_info()->addr_limit) |
| 24 | #define set_fs(x) (current_thread_info()->addr_limit = (x)) |
| 25 | |
| 26 | /* |
| 27 | * Note that since kernel addresses are in a separate address space on |
Jesper Juhl | e49332b | 2005-05-01 08:59:08 -0700 | [diff] [blame] | 28 | * parisc, we don't need to do anything for access_ok(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | * We just let the page fault handler do the right thing. This also means |
| 30 | * that put_user is the same as __put_user, etc. |
| 31 | */ |
| 32 | |
Helge Deller | a0ffa8f | 2013-11-19 23:31:35 +0100 | [diff] [blame] | 33 | static inline long access_ok(int type, const void __user * addr, |
| 34 | unsigned long size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | { |
Helge Deller | a0ffa8f | 2013-11-19 23:31:35 +0100 | [diff] [blame] | 36 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | } |
| 38 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | #define put_user __put_user |
| 40 | #define get_user __get_user |
| 41 | |
Helge Deller | ca72a22 | 2006-12-20 00:35:57 +0100 | [diff] [blame] | 42 | #if !defined(CONFIG_64BIT) |
Helge Deller | 8dd95c6 | 2014-10-21 21:29:09 +0200 | [diff] [blame] | 43 | #define LDD_KERNEL(ptr) BUILD_BUG() |
| 44 | #define LDD_USER(ptr) BUILD_BUG() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | #define STD_KERNEL(x, ptr) __put_kernel_asm64(x,ptr) |
| 46 | #define STD_USER(x, ptr) __put_user_asm64(x,ptr) |
Helge Deller | 94a1981 | 2006-12-19 22:33:58 +0100 | [diff] [blame] | 47 | #define ASM_WORD_INSN ".word\t" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | #else |
Helge Deller | 94a1981 | 2006-12-19 22:33:58 +0100 | [diff] [blame] | 49 | #define LDD_KERNEL(ptr) __get_kernel_asm("ldd",ptr) |
| 50 | #define LDD_USER(ptr) __get_user_asm("ldd",ptr) |
| 51 | #define STD_KERNEL(x, ptr) __put_kernel_asm("std",x,ptr) |
| 52 | #define STD_USER(x, ptr) __put_user_asm("std",x,ptr) |
| 53 | #define ASM_WORD_INSN ".dword\t" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | #endif |
| 55 | |
| 56 | /* |
| 57 | * The exception table contains two values: the first is an address |
| 58 | * for an instruction that is allowed to fault, and the second is |
Helge Deller | 61dbbae | 2013-10-13 21:11:30 +0200 | [diff] [blame] | 59 | * the address to the fixup routine. Even on a 64bit kernel we could |
| 60 | * use a 32bit (unsigned int) address here. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | */ |
| 62 | |
| 63 | struct exception_table_entry { |
Helge Deller | 61dbbae | 2013-10-13 21:11:30 +0200 | [diff] [blame] | 64 | unsigned long insn; /* address of insn that is allowed to fault. */ |
| 65 | unsigned long fixup; /* fixup routine */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | }; |
| 67 | |
Helge Deller | 0b3d643 | 2007-01-28 14:52:57 +0100 | [diff] [blame] | 68 | #define ASM_EXCEPTIONTABLE_ENTRY( fault_addr, except_addr )\ |
| 69 | ".section __ex_table,\"aw\"\n" \ |
| 70 | ASM_WORD_INSN #fault_addr ", " #except_addr "\n\t" \ |
| 71 | ".previous\n" |
| 72 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | /* |
| 74 | * The page fault handler stores, in a per-cpu area, the following information |
| 75 | * if a fixup routine is available. |
| 76 | */ |
| 77 | struct exception_data { |
| 78 | unsigned long fault_ip; |
| 79 | unsigned long fault_space; |
| 80 | unsigned long fault_addr; |
| 81 | }; |
| 82 | |
| 83 | #define __get_user(x,ptr) \ |
| 84 | ({ \ |
| 85 | register long __gu_err __asm__ ("r8") = 0; \ |
| 86 | register long __gu_val __asm__ ("r9") = 0; \ |
| 87 | \ |
| 88 | if (segment_eq(get_fs(),KERNEL_DS)) { \ |
| 89 | switch (sizeof(*(ptr))) { \ |
| 90 | case 1: __get_kernel_asm("ldb",ptr); break; \ |
| 91 | case 2: __get_kernel_asm("ldh",ptr); break; \ |
| 92 | case 4: __get_kernel_asm("ldw",ptr); break; \ |
| 93 | case 8: LDD_KERNEL(ptr); break; \ |
Helge Deller | 8dd95c6 | 2014-10-21 21:29:09 +0200 | [diff] [blame] | 94 | default: BUILD_BUG(); break; \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | } \ |
| 96 | } \ |
| 97 | else { \ |
| 98 | switch (sizeof(*(ptr))) { \ |
| 99 | case 1: __get_user_asm("ldb",ptr); break; \ |
| 100 | case 2: __get_user_asm("ldh",ptr); break; \ |
| 101 | case 4: __get_user_asm("ldw",ptr); break; \ |
| 102 | case 8: LDD_USER(ptr); break; \ |
Helge Deller | 8dd95c6 | 2014-10-21 21:29:09 +0200 | [diff] [blame] | 103 | default: BUILD_BUG(); break; \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | } \ |
| 105 | } \ |
| 106 | \ |
| 107 | (x) = (__typeof__(*(ptr))) __gu_val; \ |
| 108 | __gu_err; \ |
| 109 | }) |
| 110 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | #define __get_kernel_asm(ldx,ptr) \ |
Helge Deller | 0b3d643 | 2007-01-28 14:52:57 +0100 | [diff] [blame] | 112 | __asm__("\n1:\t" ldx "\t0(%2),%0\n\t" \ |
| 113 | ASM_EXCEPTIONTABLE_ENTRY(1b, fixup_get_user_skip_1)\ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | : "=r"(__gu_val), "=r"(__gu_err) \ |
| 115 | : "r"(ptr), "1"(__gu_err) \ |
| 116 | : "r1"); |
| 117 | |
| 118 | #define __get_user_asm(ldx,ptr) \ |
Helge Deller | 0b3d643 | 2007-01-28 14:52:57 +0100 | [diff] [blame] | 119 | __asm__("\n1:\t" ldx "\t0(%%sr3,%2),%0\n\t" \ |
| 120 | ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_get_user_skip_1)\ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | : "=r"(__gu_val), "=r"(__gu_err) \ |
| 122 | : "r"(ptr), "1"(__gu_err) \ |
| 123 | : "r1"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | |
| 125 | #define __put_user(x,ptr) \ |
| 126 | ({ \ |
| 127 | register long __pu_err __asm__ ("r8") = 0; \ |
| 128 | __typeof__(*(ptr)) __x = (__typeof__(*(ptr)))(x); \ |
| 129 | \ |
| 130 | if (segment_eq(get_fs(),KERNEL_DS)) { \ |
| 131 | switch (sizeof(*(ptr))) { \ |
| 132 | case 1: __put_kernel_asm("stb",__x,ptr); break; \ |
| 133 | case 2: __put_kernel_asm("sth",__x,ptr); break; \ |
| 134 | case 4: __put_kernel_asm("stw",__x,ptr); break; \ |
| 135 | case 8: STD_KERNEL(__x,ptr); break; \ |
Helge Deller | 8dd95c6 | 2014-10-21 21:29:09 +0200 | [diff] [blame] | 136 | default: BUILD_BUG(); break; \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | } \ |
| 138 | } \ |
| 139 | else { \ |
| 140 | switch (sizeof(*(ptr))) { \ |
| 141 | case 1: __put_user_asm("stb",__x,ptr); break; \ |
| 142 | case 2: __put_user_asm("sth",__x,ptr); break; \ |
| 143 | case 4: __put_user_asm("stw",__x,ptr); break; \ |
| 144 | case 8: STD_USER(__x,ptr); break; \ |
Helge Deller | 8dd95c6 | 2014-10-21 21:29:09 +0200 | [diff] [blame] | 145 | default: BUILD_BUG(); break; \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | } \ |
| 147 | } \ |
| 148 | \ |
| 149 | __pu_err; \ |
| 150 | }) |
| 151 | |
| 152 | /* |
| 153 | * The "__put_user/kernel_asm()" macros tell gcc they read from memory |
| 154 | * instead of writing. This is because they do not write to any memory |
Carlos O'Donell | 3fd3a74 | 2006-04-22 14:47:21 -0600 | [diff] [blame] | 155 | * gcc knows about, so there are no aliasing issues. These macros must |
| 156 | * also be aware that "fixup_put_user_skip_[12]" are executed in the |
| 157 | * context of the fault, and any registers used there must be listed |
| 158 | * as clobbers. In this case only "r1" is used by the current routines. |
| 159 | * r8/r9 are already listed as err/val. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | */ |
| 161 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | #define __put_kernel_asm(stx,x,ptr) \ |
| 163 | __asm__ __volatile__ ( \ |
Helge Deller | 0b3d643 | 2007-01-28 14:52:57 +0100 | [diff] [blame] | 164 | "\n1:\t" stx "\t%2,0(%1)\n\t" \ |
| 165 | ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_1)\ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | : "=r"(__pu_err) \ |
Carlos O'Donell | 3fd3a74 | 2006-04-22 14:47:21 -0600 | [diff] [blame] | 167 | : "r"(ptr), "r"(x), "0"(__pu_err) \ |
| 168 | : "r1") |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | |
| 170 | #define __put_user_asm(stx,x,ptr) \ |
| 171 | __asm__ __volatile__ ( \ |
Helge Deller | 0b3d643 | 2007-01-28 14:52:57 +0100 | [diff] [blame] | 172 | "\n1:\t" stx "\t%2,0(%%sr3,%1)\n\t" \ |
| 173 | ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_1)\ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | : "=r"(__pu_err) \ |
| 175 | : "r"(ptr), "r"(x), "0"(__pu_err) \ |
| 176 | : "r1") |
| 177 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | |
Helge Deller | ca72a22 | 2006-12-20 00:35:57 +0100 | [diff] [blame] | 179 | #if !defined(CONFIG_64BIT) |
Helge Deller | 94a1981 | 2006-12-19 22:33:58 +0100 | [diff] [blame] | 180 | |
| 181 | #define __put_kernel_asm64(__val,ptr) do { \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | __asm__ __volatile__ ( \ |
Helge Deller | 0b3d643 | 2007-01-28 14:52:57 +0100 | [diff] [blame] | 183 | "\n1:\tstw %2,0(%1)" \ |
Will Deacon | 0f28b62 | 2013-04-22 12:53:43 +0000 | [diff] [blame] | 184 | "\n2:\tstw %R2,4(%1)\n\t" \ |
Helge Deller | 0b3d643 | 2007-01-28 14:52:57 +0100 | [diff] [blame] | 185 | ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_2)\ |
| 186 | ASM_EXCEPTIONTABLE_ENTRY(2b,fixup_put_user_skip_1)\ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | : "=r"(__pu_err) \ |
Will Deacon | 0f28b62 | 2013-04-22 12:53:43 +0000 | [diff] [blame] | 188 | : "r"(ptr), "r"(__val), "0"(__pu_err) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | : "r1"); \ |
| 190 | } while (0) |
| 191 | |
Helge Deller | 94a1981 | 2006-12-19 22:33:58 +0100 | [diff] [blame] | 192 | #define __put_user_asm64(__val,ptr) do { \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | __asm__ __volatile__ ( \ |
Helge Deller | 0b3d643 | 2007-01-28 14:52:57 +0100 | [diff] [blame] | 194 | "\n1:\tstw %2,0(%%sr3,%1)" \ |
Will Deacon | 0f28b62 | 2013-04-22 12:53:43 +0000 | [diff] [blame] | 195 | "\n2:\tstw %R2,4(%%sr3,%1)\n\t" \ |
Helge Deller | 0b3d643 | 2007-01-28 14:52:57 +0100 | [diff] [blame] | 196 | ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_2)\ |
| 197 | ASM_EXCEPTIONTABLE_ENTRY(2b,fixup_put_user_skip_1)\ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | : "=r"(__pu_err) \ |
Will Deacon | 0f28b62 | 2013-04-22 12:53:43 +0000 | [diff] [blame] | 199 | : "r"(ptr), "r"(__val), "0"(__pu_err) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | : "r1"); \ |
| 201 | } while (0) |
| 202 | |
Helge Deller | ca72a22 | 2006-12-20 00:35:57 +0100 | [diff] [blame] | 203 | #endif /* !defined(CONFIG_64BIT) */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | |
| 205 | |
| 206 | /* |
| 207 | * Complex access routines -- external declarations |
| 208 | */ |
| 209 | |
| 210 | extern unsigned long lcopy_to_user(void __user *, const void *, unsigned long); |
| 211 | extern unsigned long lcopy_from_user(void *, const void __user *, unsigned long); |
| 212 | extern unsigned long lcopy_in_user(void __user *, const void __user *, unsigned long); |
James Bottomley | b1195c0 | 2012-05-26 09:48:19 +0100 | [diff] [blame] | 213 | extern long strncpy_from_user(char *, const char __user *, long); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | extern unsigned lclear_user(void __user *,unsigned long); |
| 215 | extern long lstrnlen_user(const char __user *,long); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | /* |
| 217 | * Complex access routines -- macros |
| 218 | */ |
Helge Deller | a0ffa8f | 2013-11-19 23:31:35 +0100 | [diff] [blame] | 219 | #define user_addr_max() (~0UL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | #define strnlen_user lstrnlen_user |
| 222 | #define strlen_user(str) lstrnlen_user(str, 0x7fffffffL) |
| 223 | #define clear_user lclear_user |
| 224 | #define __clear_user lclear_user |
| 225 | |
| 226 | unsigned long copy_to_user(void __user *dst, const void *src, unsigned long len); |
| 227 | #define __copy_to_user copy_to_user |
Helge Deller | 888c31f | 2010-02-01 19:56:33 +0000 | [diff] [blame] | 228 | unsigned long __copy_from_user(void *dst, const void __user *src, unsigned long len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | unsigned long copy_in_user(void __user *dst, const void __user *src, unsigned long len); |
| 230 | #define __copy_in_user copy_in_user |
| 231 | #define __copy_to_user_inatomic __copy_to_user |
| 232 | #define __copy_from_user_inatomic __copy_from_user |
| 233 | |
Helge Deller | 888c31f | 2010-02-01 19:56:33 +0000 | [diff] [blame] | 234 | extern void copy_from_user_overflow(void) |
| 235 | #ifdef CONFIG_DEBUG_STRICT_USER_COPY_CHECKS |
| 236 | __compiletime_error("copy_from_user() buffer size is not provably correct") |
| 237 | #else |
| 238 | __compiletime_warning("copy_from_user() buffer size is not provably correct") |
| 239 | #endif |
| 240 | ; |
| 241 | |
| 242 | static inline unsigned long __must_check copy_from_user(void *to, |
| 243 | const void __user *from, |
| 244 | unsigned long n) |
| 245 | { |
| 246 | int sz = __compiletime_object_size(to); |
| 247 | int ret = -EFAULT; |
| 248 | |
| 249 | if (likely(sz == -1 || !__builtin_constant_p(n) || sz >= n)) |
| 250 | ret = __copy_from_user(to, from, n); |
| 251 | else |
| 252 | copy_from_user_overflow(); |
| 253 | |
| 254 | return ret; |
| 255 | } |
| 256 | |
Helge Deller | e448372 | 2009-01-13 20:52:46 +0100 | [diff] [blame] | 257 | struct pt_regs; |
Kyle McMartin | c61c25e | 2008-12-20 02:29:06 +0000 | [diff] [blame] | 258 | int fixup_exception(struct pt_regs *regs); |
| 259 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | #endif /* __PARISC_UACCESS_H */ |