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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 | /* SPDX-License-Identifier: GPL-2.0 */ #ifndef __PARISC_UACCESS_H #define __PARISC_UACCESS_H /* * User space memory access functions */ #include <asm/page.h> #include <asm/cache.h> #include <asm/extable.h> #include <linux/bug.h> #include <linux/string.h> #define TASK_SIZE_MAX DEFAULT_TASK_SIZE #include <asm/pgtable.h> #include <asm-generic/access_ok.h> #define put_user __put_user #define get_user __get_user #if !defined(CONFIG_64BIT) #define LDD_USER(sr, val, ptr) __get_user_asm64(sr, val, ptr) #define STD_USER(sr, x, ptr) __put_user_asm64(sr, x, ptr) #else #define LDD_USER(sr, val, ptr) __get_user_asm(sr, val, "ldd", ptr) #define STD_USER(sr, x, ptr) __put_user_asm(sr, "std", x, ptr) #endif #define __get_user_internal(sr, val, ptr) \ ({ \ ASM_EXCEPTIONTABLE_VAR(__gu_err); \ \ switch (sizeof(*(ptr))) { \ case 1: __get_user_asm(sr, val, "ldb", ptr); break; \ case 2: __get_user_asm(sr, val, "ldh", ptr); break; \ case 4: __get_user_asm(sr, val, "ldw", ptr); break; \ case 8: LDD_USER(sr, val, ptr); break; \ default: BUILD_BUG(); \ } \ \ __gu_err; \ }) #define __get_user(val, ptr) \ ({ \ __get_user_internal(SR_USER, val, ptr); \ }) #define __get_user_asm(sr, val, ldx, ptr) \ { \ register long __gu_val; \ \ __asm__("1: " ldx " 0(%%sr%2,%3),%0\n" \ "9:\n" \ ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 9b, "%1") \ : "=r"(__gu_val), "+r"(__gu_err) \ : "i"(sr), "r"(ptr)); \ \ (val) = (__force __typeof__(*(ptr))) __gu_val; \ } #define __get_kernel_nofault(dst, src, type, err_label) \ { \ type __z; \ long __err; \ __err = __get_user_internal(SR_KERNEL, __z, (type *)(src)); \ if (unlikely(__err)) \ goto err_label; \ else \ *(type *)(dst) = __z; \ } #if !defined(CONFIG_64BIT) #define __get_user_asm64(sr, val, ptr) \ { \ union { \ unsigned long long l; \ __typeof__(*(ptr)) t; \ } __gu_tmp; \ \ __asm__(" copy %%r0,%R0\n" \ "1: ldw 0(%%sr%2,%3),%0\n" \ "2: ldw 4(%%sr%2,%3),%R0\n" \ "9:\n" \ ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 9b, "%1") \ ASM_EXCEPTIONTABLE_ENTRY_EFAULT(2b, 9b, "%1") \ : "=&r"(__gu_tmp.l), "+r"(__gu_err) \ : "i"(sr), "r"(ptr)); \ \ (val) = __gu_tmp.t; \ } #endif /* !defined(CONFIG_64BIT) */ #define __put_user_internal(sr, x, ptr) \ ({ \ ASM_EXCEPTIONTABLE_VAR(__pu_err); \ \ switch (sizeof(*(ptr))) { \ case 1: __put_user_asm(sr, "stb", x, ptr); break; \ case 2: __put_user_asm(sr, "sth", x, ptr); break; \ case 4: __put_user_asm(sr, "stw", x, ptr); break; \ case 8: STD_USER(sr, x, ptr); break; \ default: BUILD_BUG(); \ } \ \ __pu_err; \ }) #define __put_user(x, ptr) \ ({ \ __typeof__(&*(ptr)) __ptr = ptr; \ __typeof__(*(__ptr)) __x = (__typeof__(*(__ptr)))(x); \ __put_user_internal(SR_USER, __x, __ptr); \ }) #define __put_kernel_nofault(dst, src, type, err_label) \ { \ type __z = *(type *)(src); \ long __err; \ __err = __put_user_internal(SR_KERNEL, __z, (type *)(dst)); \ if (unlikely(__err)) \ goto err_label; \ } /* * The "__put_user/kernel_asm()" macros tell gcc they read from memory * instead of writing. This is because they do not write to any memory * gcc knows about, so there are no aliasing issues. These macros must * also be aware that fixups are executed in the context of the fault, * and any registers used there must be listed as clobbers. * The register holding the possible EFAULT error (ASM_EXCEPTIONTABLE_REG) * is already listed as input and output register. */ #define __put_user_asm(sr, stx, x, ptr) \ __asm__ __volatile__ ( \ "1: " stx " %1,0(%%sr%2,%3)\n" \ "9:\n" \ ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 9b, "%0") \ : "+r"(__pu_err) \ : "r"(x), "i"(sr), "r"(ptr)) #if !defined(CONFIG_64BIT) #define __put_user_asm64(sr, __val, ptr) do { \ __asm__ __volatile__ ( \ "1: stw %1,0(%%sr%2,%3)\n" \ "2: stw %R1,4(%%sr%2,%3)\n" \ "9:\n" \ ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 9b, "%0") \ ASM_EXCEPTIONTABLE_ENTRY_EFAULT(2b, 9b, "%0") \ : "+r"(__pu_err) \ : "r"(__val), "i"(sr), "r"(ptr)); \ } while (0) #endif /* !defined(CONFIG_64BIT) */ /* * Complex access routines -- external declarations */ extern long strncpy_from_user(char *, const char __user *, long); extern __must_check unsigned lclear_user(void __user *, unsigned long); extern __must_check long strnlen_user(const char __user *src, long n); /* * Complex access routines -- macros */ #define clear_user lclear_user #define __clear_user lclear_user unsigned long __must_check raw_copy_to_user(void __user *dst, const void *src, unsigned long len); unsigned long __must_check raw_copy_from_user(void *dst, const void __user *src, unsigned long len); #define INLINE_COPY_TO_USER #define INLINE_COPY_FROM_USER #endif /* __PARISC_UACCESS_H */ |