1#ifndef __PARISC_UACCESS_H 2#define __PARISC_UACCESS_H 3 4/* 5 * User space memory access functions 6 */ 7#include <linux/sched.h> 8#include <asm/page.h> 9#include <asm/system.h> 10#include <asm/cache.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->addr_limit) 22#define set_fs(x) (current->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() or verify_area(). 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#define access_ok(type,addr,size) (1) 32#define verify_area(type,addr,size) (0) 33 34#define put_user __put_user 35#define get_user __get_user 36 37#if BITS_PER_LONG == 32 38#define LDD_KERNEL(ptr) BUG() 39#define LDD_USER(ptr) BUG() 40#define STD_KERNEL(x, ptr) BUG() 41#define STD_USER(x, ptr) BUG() 42#else 43#define LDD_KERNEL(ptr) __get_kernel_asm("ldd",ptr) 44#define LDD_USER(ptr) __get_user_asm("ldd",ptr) 45#define STD_KERNEL(x, ptr) __put_kernel_asm("std",x,ptr) 46#define STD_USER(x, ptr) __put_user_asm("std",x,ptr) 47#endif 48 49/* 50 * The exception table contains two values: the first is an address 51 * for an instruction that is allowed to fault, and the second is 52 * the number of bytes to skip if a fault occurs. We also support in 53 * two bit flags: 0x2 tells the exception handler to clear register 54 * r9 and 0x1 tells the exception handler to put -EFAULT in r8. 55 * This allows us to handle the simple cases for put_user and 56 * get_user without having to have .fixup sections. 57 */ 58 59struct exception_table_entry { 60 unsigned long addr; /* address of insn that is allowed to fault. */ 61 long skip; /* pcoq skip | r9 clear flag | r8 -EFAULT flag */ 62}; 63 64extern const struct exception_table_entry 65 *search_exception_table(unsigned long addr); 66 67#define __get_user(x,ptr) \ 68({ \ 69 register long __gu_err __asm__ ("r8") = 0; \ 70 register long __gu_val __asm__ ("r9") = 0; \ 71 \ 72 if (segment_eq(get_fs(),KERNEL_DS)) { \ 73 switch (sizeof(*(ptr))) { \ 74 case 1: __get_kernel_asm("ldb",ptr); break; \ 75 case 2: __get_kernel_asm("ldh",ptr); break; \ 76 case 4: __get_kernel_asm("ldw",ptr); break; \ 77 case 8: LDD_KERNEL(ptr); break; \ 78 default: BUG(); break; \ 79 } \ 80 } \ 81 else { \ 82 switch (sizeof(*(ptr))) { \ 83 case 1: __get_user_asm("ldb",ptr); break; \ 84 case 2: __get_user_asm("ldh",ptr); break; \ 85 case 4: __get_user_asm("ldw",ptr); break; \ 86 case 8: LDD_USER(ptr); break; \ 87 default: BUG(); break; \ 88 } \ 89 } \ 90 \ 91 (x) = (__typeof__(*(ptr))) __gu_val; \ 92 __gu_err; \ 93}) 94 95#ifdef __LP64__ 96#define __get_kernel_asm(ldx,ptr) \ 97 __asm__("\n1:\t" ldx "\t0(%2),%0\n" \ 98 "2:\n" \ 99 "\t.section __ex_table,\"a\"\n" \ 100 "\t.dword\t1b\n" \ 101 "\t.dword\t(2b-1b)+3\n" \ 102 "\t.previous" \ 103 : "=r"(__gu_val), "=r"(__gu_err) \ 104 : "r"(ptr), "1"(__gu_err)); 105 106#define __get_user_asm(ldx,ptr) \ 107 __asm__("\n1:\t" ldx "\t0(%%sr3,%2),%0\n" \ 108 "2:\n" \ 109 "\t.section __ex_table,\"a\"\n" \ 110 "\t.dword\t1b\n" \ 111 "\t.dword\t(2b-1b)+3\n" \ 112 "\t.previous" \ 113 : "=r"(__gu_val), "=r"(__gu_err) \ 114 : "r"(ptr), "1"(__gu_err)); 115#else 116#define __get_kernel_asm(ldx,ptr) \ 117 __asm__("\n1:\t" ldx "\t0(%2),%0\n" \ 118 "2:\n" \ 119 "\t.section __ex_table,\"a\"\n" \ 120 "\t.word\t1b\n" \ 121 "\t.word\t(2b-1b)+3\n" \ 122 "\t.previous" \ 123 : "=r"(__gu_val), "=r"(__gu_err) \ 124 : "r"(ptr), "1"(__gu_err)); 125 126#define __get_user_asm(ldx,ptr) \ 127 __asm__("\n1:\t" ldx "\t0(%%sr3,%2),%0\n" \ 128 "2:\n" \ 129 "\t.section __ex_table,\"a\"\n" \ 130 "\t.word\t1b\n" \ 131 "\t.word\t(2b-1b)+3\n" \ 132 "\t.previous" \ 133 : "=r"(__gu_val), "=r"(__gu_err) \ 134 : "r"(ptr), "1"(__gu_err)); 135#endif 136 137#define __put_user(x,ptr) \ 138({ \ 139 register long __pu_err __asm__ ("r8") = 0; \ 140 \ 141 if (segment_eq(get_fs(),KERNEL_DS)) { \ 142 switch (sizeof(*(ptr))) { \ 143 case 1: __put_kernel_asm("stb",x,ptr); break; \ 144 case 2: __put_kernel_asm("sth",x,ptr); break; \ 145 case 4: __put_kernel_asm("stw",x,ptr); break; \ 146 case 8: STD_KERNEL(x,ptr); break; \ 147 default: BUG(); break; \ 148 } \ 149 } \ 150 else { \ 151 switch (sizeof(*(ptr))) { \ 152 case 1: __put_user_asm("stb",x,ptr); break; \ 153 case 2: __put_user_asm("sth",x,ptr); break; \ 154 case 4: __put_user_asm("stw",x,ptr); break; \ 155 case 8: STD_USER(x,ptr); break; \ 156 default: BUG(); break; \ 157 } \ 158 } \ 159 \ 160 __pu_err; \ 161}) 162 163/* 164 * The "__put_user/kernel_asm()" macros tell gcc they read from memory 165 * instead of writing. This is because they do not write to any memory 166 * gcc knows about, so there are no aliasing issues. 167 */ 168 169#ifdef __LP64__ 170#define __put_kernel_asm(stx,x,ptr) \ 171 __asm__ __volatile__ ( \ 172 "\n1:\t" stx "\t%2,0(%1)\n" \ 173 "2:\n" \ 174 "\t.section __ex_table,\"a\"\n" \ 175 "\t.dword\t1b\n" \ 176 "\t.dword\t(2b-1b)+1\n" \ 177 "\t.previous" \ 178 : "=r"(__pu_err) \ 179 : "r"(ptr), "r"(x), "0"(__pu_err)) 180 181#define __put_user_asm(stx,x,ptr) \ 182 __asm__ __volatile__ ( \ 183 "\n1:\t" stx "\t%2,0(%%sr3,%1)\n" \ 184 "2:\n" \ 185 "\t.section __ex_table,\"a\"\n" \ 186 "\t.dword\t1b\n" \ 187 "\t.dword\t(2b-1b)+1\n" \ 188 "\t.previous" \ 189 : "=r"(__pu_err) \ 190 : "r"(ptr), "r"(x), "0"(__pu_err)) 191#else 192#define __put_kernel_asm(stx,x,ptr) \ 193 __asm__ __volatile__ ( \ 194 "\n1:\t" stx "\t%2,0(%1)\n" \ 195 "2:\n" \ 196 "\t.section __ex_table,\"a\"\n" \ 197 "\t.word\t1b\n" \ 198 "\t.word\t(2b-1b)+1\n" \ 199 "\t.previous" \ 200 : "=r"(__pu_err) \ 201 : "r"(ptr), "r"(x), "0"(__pu_err)) 202 203#define __put_user_asm(stx,x,ptr) \ 204 __asm__ __volatile__ ( \ 205 "\n1:\t" stx "\t%2,0(%%sr3,%1)\n" \ 206 "2:\n" \ 207 "\t.section __ex_table,\"a\"\n" \ 208 "\t.word\t1b\n" \ 209 "\t.word\t(2b-1b)+1\n" \ 210 "\t.previous" \ 211 : "=r"(__pu_err) \ 212 : "r"(ptr), "r"(x), "0"(__pu_err)) 213#endif 214 215 216/* 217 * Complex access routines -- external declarations 218 */ 219 220extern unsigned long lcopy_to_user(void *, const void *, unsigned long); 221extern unsigned long lcopy_from_user(void *, const void *, unsigned long); 222extern long lstrncpy_from_user(char *, const char *, long); 223extern unsigned lclear_user(void *,unsigned long); 224extern long lstrnlen_user(const char *,long); 225 226/* 227 * Complex access routines -- macros 228 */ 229 230#define strncpy_from_user lstrncpy_from_user 231#define strnlen_user lstrnlen_user 232#define strlen_user(str) lstrnlen_user(str, 0x7fffffffL) 233#define clear_user lclear_user 234#define __clear_user lclear_user 235 236#define copy_from_user lcopy_from_user 237#define __copy_from_user lcopy_from_user 238#define copy_to_user lcopy_to_user 239#define __copy_to_user lcopy_to_user 240 241#endif /* __PARISC_UACCESS_H */ 242