Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 | /* * User space memory access functions for Nios II * * Copyright (C) 2010-2011, Tobias Klauser <tklauser@distanz.ch> * Copyright (C) 2009, Wind River Systems Inc * Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. */ #ifndef _ASM_NIOS2_UACCESS_H #define _ASM_NIOS2_UACCESS_H #include <linux/string.h> #include <asm/page.h> #include <asm/extable.h> #include <asm-generic/access_ok.h> # define __EX_TABLE_SECTION ".section __ex_table,\"a\"\n" /* * Zero Userspace */ static inline unsigned long __must_check __clear_user(void __user *to, unsigned long n) { __asm__ __volatile__ ( "1: stb zero, 0(%1)\n" " addi %0, %0, -1\n" " addi %1, %1, 1\n" " bne %0, zero, 1b\n" "2:\n" __EX_TABLE_SECTION ".word 1b, 2b\n" ".previous\n" : "=r" (n), "=r" (to) : "0" (n), "1" (to) ); return n; } static inline unsigned long __must_check clear_user(void __user *to, unsigned long n) { if (!access_ok(to, n)) return n; return __clear_user(to, n); } extern unsigned long raw_copy_from_user(void *to, const void __user *from, unsigned long n); extern unsigned long raw_copy_to_user(void __user *to, const void *from, unsigned long n); #define INLINE_COPY_FROM_USER #define INLINE_COPY_TO_USER extern long strncpy_from_user(char *__to, const char __user *__from, long __len); extern __must_check long strnlen_user(const char __user *s, long n); /* Optimized macros */ #define __get_user_asm(val, insn, addr, err) \ { \ unsigned long __gu_val; \ __asm__ __volatile__( \ " movi %0, %3\n" \ "1: " insn " %1, 0(%2)\n" \ " movi %0, 0\n" \ "2:\n" \ " .section __ex_table,\"a\"\n" \ " .word 1b, 2b\n" \ " .previous" \ : "=&r" (err), "=r" (__gu_val) \ : "r" (addr), "i" (-EFAULT)); \ val = (__force __typeof__(*(addr)))__gu_val; \ } extern void __get_user_unknown(void); #define __get_user_8(val, ptr, err) do { \ u64 __val = 0; \ err = 0; \ if (raw_copy_from_user(&(__val), ptr, sizeof(val))) { \ err = -EFAULT; \ } else { \ val = (typeof(val))(typeof((val) - (val)))__val; \ } \ } while (0) #define __get_user_common(val, size, ptr, err) \ do { \ switch (size) { \ case 1: \ __get_user_asm(val, "ldbu", ptr, err); \ break; \ case 2: \ __get_user_asm(val, "ldhu", ptr, err); \ break; \ case 4: \ __get_user_asm(val, "ldw", ptr, err); \ break; \ case 8: \ __get_user_8(val, ptr, err); \ break; \ default: \ __get_user_unknown(); \ break; \ } \ } while (0) #define __get_user(x, ptr) \ ({ \ long __gu_err = -EFAULT; \ const __typeof__(*(ptr)) __user *__gu_ptr = (ptr); \ __get_user_common(x, sizeof(*(ptr)), __gu_ptr, __gu_err); \ __gu_err; \ }) #define get_user(x, ptr) \ ({ \ long __gu_err = -EFAULT; \ const __typeof__(*(ptr)) __user *__gu_ptr = (ptr); \ if (access_ok( __gu_ptr, sizeof(*__gu_ptr))) \ __get_user_common(x, sizeof(*__gu_ptr), \ __gu_ptr, __gu_err); \ __gu_err; \ }) #define __put_user_asm(val, insn, ptr, err) \ { \ __asm__ __volatile__( \ " movi %0, %3\n" \ "1: " insn " %1, 0(%2)\n" \ " movi %0, 0\n" \ "2:\n" \ " .section __ex_table,\"a\"\n" \ " .word 1b, 2b\n" \ " .previous\n" \ : "=&r" (err) \ : "r" (val), "r" (ptr), "i" (-EFAULT)); \ } #define __put_user_common(__pu_val, __pu_ptr) \ ({ \ long __pu_err = -EFAULT; \ switch (sizeof(*__pu_ptr)) { \ case 1: \ __put_user_asm(__pu_val, "stb", __pu_ptr, __pu_err); \ break; \ case 2: \ __put_user_asm(__pu_val, "sth", __pu_ptr, __pu_err); \ break; \ case 4: \ __put_user_asm(__pu_val, "stw", __pu_ptr, __pu_err); \ break; \ default: \ /* XXX: This looks wrong... */ \ __pu_err = 0; \ if (__copy_to_user(__pu_ptr, &(__pu_val), \ sizeof(*__pu_ptr))) \ __pu_err = -EFAULT; \ break; \ } \ __pu_err; \ }) #define __put_user(x, ptr) \ ({ \ __auto_type __pu_ptr = (ptr); \ typeof(*__pu_ptr) __pu_val = (typeof(*__pu_ptr))(x); \ __put_user_common(__pu_val, __pu_ptr); \ }) #define put_user(x, ptr) \ ({ \ __auto_type __pu_ptr = (ptr); \ typeof(*__pu_ptr) __pu_val = (typeof(*__pu_ptr))(x); \ access_ok(__pu_ptr, sizeof(*__pu_ptr)) ? \ __put_user_common(__pu_val, __pu_ptr) : \ -EFAULT; \ }) #endif /* _ASM_NIOS2_UACCESS_H */ |