| 1 | /* |
| 2 | * Copyright (C) 2006 Atmark Techno, Inc. |
| 3 | * |
| 4 | * This file is subject to the terms and conditions of the GNU General Public |
| 5 | * License. See the file "COPYING" in the main directory of this archive |
| 6 | * for more details. |
| 7 | */ |
| 8 | |
| 9 | #ifndef _ASM_MICROBLAZE_UACCESS_H |
| 10 | #define _ASM_MICROBLAZE_UACCESS_H |
| 11 | |
| 12 | #ifdef __KERNEL__ |
| 13 | #ifndef __ASSEMBLY__ |
| 14 | |
| 15 | #include <linux/kernel.h> |
| 16 | #include <linux/errno.h> |
| 17 | #include <linux/sched.h> /* RLIMIT_FSIZE */ |
| 18 | #include <linux/mm.h> |
| 19 | |
| 20 | #include <asm/mmu.h> |
| 21 | #include <asm/page.h> |
| 22 | #include <asm/pgtable.h> |
| 23 | #include <asm/segment.h> |
| 24 | #include <linux/string.h> |
| 25 | |
| 26 | #define VERIFY_READ 0 |
| 27 | #define VERIFY_WRITE 1 |
| 28 | |
| 29 | extern int ___range_ok(unsigned long addr, unsigned long size); |
| 30 | |
| 31 | #define __range_ok(addr, size) \ |
| 32 | ___range_ok((unsigned long)(addr), (unsigned long)(size)) |
| 33 | |
| 34 | #define access_ok(type, addr, size) (__range_ok((addr), (size)) == 0) |
| 35 | #define __access_ok(add, size) (__range_ok((addr), (size)) == 0) |
| 36 | |
| 37 | extern inline int bad_user_access_length(void) |
| 38 | { |
| 39 | return 0; |
| 40 | } |
| 41 | /* FIXME this is function for optimalization -> memcpy */ |
| 42 | #define __get_user(var, ptr) \ |
| 43 | ({ \ |
| 44 | int __gu_err = 0; \ |
| 45 | switch (sizeof(*(ptr))) { \ |
| 46 | case 1: \ |
| 47 | case 2: \ |
| 48 | case 4: \ |
| 49 | (var) = *(ptr); \ |
| 50 | break; \ |
| 51 | case 8: \ |
| 52 | memcpy((void *) &(var), (ptr), 8); \ |
| 53 | break; \ |
| 54 | default: \ |
| 55 | (var) = 0; \ |
| 56 | __gu_err = __get_user_bad(); \ |
| 57 | break; \ |
| 58 | } \ |
| 59 | __gu_err; \ |
| 60 | }) |
| 61 | |
| 62 | #define __get_user_bad() (bad_user_access_length(), (-EFAULT)) |
| 63 | |
| 64 | #define __put_user(var, ptr) \ |
| 65 | ({ \ |
| 66 | int __pu_err = 0; \ |
| 67 | switch (sizeof(*(ptr))) { \ |
| 68 | case 1: \ |
| 69 | case 2: \ |
| 70 | case 4: \ |
| 71 | *(ptr) = (var); \ |
| 72 | break; \ |
| 73 | case 8: { \ |
| 74 | typeof(*(ptr)) __pu_val = var; \ |
| 75 | memcpy(ptr, &__pu_val, sizeof(__pu_val));\ |
| 76 | } \ |
| 77 | break; \ |
| 78 | default: \ |
| 79 | __pu_err = __put_user_bad(); \ |
| 80 | break; \ |
| 81 | } \ |
| 82 | __pu_err; \ |
| 83 | }) |
| 84 | |
| 85 | #define __put_user_bad() (bad_user_access_length(), (-EFAULT)) |
| 86 | |
| 87 | #define put_user(x, ptr) __put_user(x, ptr) |
| 88 | #define get_user(x, ptr) __get_user(x, ptr) |
| 89 | |
| 90 | #define copy_to_user(to, from, n) (memcpy(to, from, n), 0) |
| 91 | #define copy_from_user(to, from, n) (memcpy(to, from, n), 0) |
| 92 | |
| 93 | #define __copy_to_user(to, from, n) (copy_to_user(to, from, n)) |
| 94 | #define __copy_from_user(to, from, n) (copy_from_user(to, from, n)) |
| 95 | #define __copy_to_user_inatomic(to, from, n) (__copy_to_user(to, from, n)) |
| 96 | #define __copy_from_user_inatomic(to, from, n) (__copy_from_user(to, from, n)) |
| 97 | |
| 98 | #define __clear_user(addr, n) (memset((void *)addr, 0, n), 0) |
| 99 | |
| 100 | static inline unsigned long clear_user(void *addr, unsigned long size) |
| 101 | { |
| 102 | if (access_ok(VERIFY_WRITE, addr, size)) |
| 103 | size = __clear_user(addr, size); |
| 104 | return size; |
| 105 | } |
| 106 | |
| 107 | /* Returns 0 if exception not found and fixup otherwise. */ |
| 108 | extern unsigned long search_exception_table(unsigned long); |
| 109 | |
| 110 | |
| 111 | extern long strncpy_from_user(char *dst, const char __user *src, long count); |
| 112 | extern long strnlen_user(const char __user *src, long count); |
| 113 | extern long __strncpy_from_user(char *dst, const char __user *src, long count); |
| 114 | |
| 115 | /* |
| 116 | * The exception table consists of pairs of addresses: the first is the |
| 117 | * address of an instruction that is allowed to fault, and the second is |
| 118 | * the address at which the program should continue. No registers are |
| 119 | * modified, so it is entirely up to the continuation code to figure out |
| 120 | * what to do. |
| 121 | * |
| 122 | * All the routines below use bits of fixup code that are out of line |
| 123 | * with the main instruction path. This means when everything is well, |
| 124 | * we don't even have to jump over them. Further, they do not intrude |
| 125 | * on our cache or tlb entries. |
| 126 | */ |
| 127 | struct exception_table_entry { |
| 128 | unsigned long insn, fixup; |
| 129 | }; |
| 130 | |
| 131 | #endif /* __ASSEMBLY__ */ |
| 132 | #endif /* __KERNEL__ */ |
| 133 | |
| 134 | #endif /* _ASM_MICROBLAZE_UACCESS_H */ |