1#ifndef __PARISC_UACCESS_H 2#define __PARISC_UACCESS_H 3 4/* 5 * User space memory access functions 6 */ 7#include <asm/page.h> 8#include <asm/system.h> 9#include <asm/cache.h> 10#include <asm/errno.h> 11#include <asm-generic/uaccess-unaligned.h> 12 13#define VERIFY_READ 0 14#define VERIFY_WRITE 1 15 16#define KERNEL_DS ((mm_segment_t){0}) 17#define USER_DS ((mm_segment_t){1}) 18 19#define segment_eq(a,b) ((a).seg == (b).seg) 20 21#define get_ds() (KERNEL_DS) 22#define get_fs() (current_thread_info()->addr_limit) 23#define set_fs(x) (current_thread_info()->addr_limit = (x)) 24 25/* 26 * Note that since kernel addresses are in a separate address space on 27 * parisc, we don't need to do anything for access_ok(). 28 * We just let the page fault handler do the right thing. This also means 29 * that put_user is the same as __put_user, etc. 30 */ 31 32extern int __get_kernel_bad(void); 33extern int __get_user_bad(void); 34extern int __put_kernel_bad(void); 35extern int __put_user_bad(void); 36 37static inline long access_ok(int type, const void __user * addr, 38 unsigned long size) 39{ 40 return 1; 41} 42 43#define put_user __put_user 44#define get_user __get_user 45 46#if !defined(CONFIG_64BIT) 47#define LDD_KERNEL(ptr) __get_kernel_bad(); 48#define LDD_USER(ptr) __get_user_bad(); 49#define STD_KERNEL(x, ptr) __put_kernel_asm64(x,ptr) 50#define STD_USER(x, ptr) __put_user_asm64(x,ptr) 51#define ASM_WORD_INSN ".word\t" 52#else 53#define LDD_KERNEL(ptr) __get_kernel_asm("ldd",ptr) 54#define LDD_USER(ptr) __get_user_asm("ldd",ptr) 55#define STD_KERNEL(x, ptr) __put_kernel_asm("std",x,ptr) 56#define STD_USER(x, ptr) __put_user_asm("std",x,ptr) 57#define ASM_WORD_INSN ".dword\t" 58#endif 59 60/* 61 * The exception table contains two values: the first is an address 62 * for an instruction that is allowed to fault, and the second is 63 * the address to the fixup routine. 64 */ 65 66struct exception_table_entry { 67 unsigned long insn; /* address of insn that is allowed to fault. */ 68 long fixup; /* fixup routine */ 69}; 70 71#define ASM_EXCEPTIONTABLE_ENTRY( fault_addr, except_addr )\ 72 ".section __ex_table,\"aw\"\n" \ 73 ASM_WORD_INSN #fault_addr ", " #except_addr "\n\t" \ 74 ".previous\n" 75 76/* 77 * The page fault handler stores, in a per-cpu area, the following information 78 * if a fixup routine is available. 79 */ 80struct exception_data { 81 unsigned long fault_ip; 82 unsigned long fault_space; 83 unsigned long fault_addr; 84}; 85 86#define __get_user(x,ptr) \ 87({ \ 88 register long __gu_err __asm__ ("r8") = 0; \ 89 register long __gu_val __asm__ ("r9") = 0; \ 90 \ 91 if (segment_eq(get_fs(),KERNEL_DS)) { \ 92 switch (sizeof(*(ptr))) { \ 93 case 1: __get_kernel_asm("ldb",ptr); break; \ 94 case 2: __get_kernel_asm("ldh",ptr); break; \ 95 case 4: __get_kernel_asm("ldw",ptr); break; \ 96 case 8: LDD_KERNEL(ptr); break; \ 97 default: __get_kernel_bad(); break; \ 98 } \ 99 } \ 100 else { \ 101 switch (sizeof(*(ptr))) { \ 102 case 1: __get_user_asm("ldb",ptr); break; \ 103 case 2: __get_user_asm("ldh",ptr); break; \ 104 case 4: __get_user_asm("ldw",ptr); break; \ 105 case 8: LDD_USER(ptr); break; \ 106 default: __get_user_bad(); break; \ 107 } \ 108 } \ 109 \ 110 (x) = (__typeof__(*(ptr))) __gu_val; \ 111 __gu_err; \ 112}) 113 114#define __get_kernel_asm(ldx,ptr) \ 115 __asm__("\n1:\t" ldx "\t0(%2),%0\n\t" \ 116 ASM_EXCEPTIONTABLE_ENTRY(1b, fixup_get_user_skip_1)\ 117 : "=r"(__gu_val), "=r"(__gu_err) \ 118 : "r"(ptr), "1"(__gu_err) \ 119 : "r1"); 120 121#define __get_user_asm(ldx,ptr) \ 122 __asm__("\n1:\t" ldx "\t0(%%sr3,%2),%0\n\t" \ 123 ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_get_user_skip_1)\ 124 : "=r"(__gu_val), "=r"(__gu_err) \ 125 : "r"(ptr), "1"(__gu_err) \ 126 : "r1"); 127 128#define __put_user(x,ptr) \ 129({ \ 130 register long __pu_err __asm__ ("r8") = 0; \ 131 __typeof__(*(ptr)) __x = (__typeof__(*(ptr)))(x); \ 132 \ 133 if (segment_eq(get_fs(),KERNEL_DS)) { \ 134 switch (sizeof(*(ptr))) { \ 135 case 1: __put_kernel_asm("stb",__x,ptr); break; \ 136 case 2: __put_kernel_asm("sth",__x,ptr); break; \ 137 case 4: __put_kernel_asm("stw",__x,ptr); break; \ 138 case 8: STD_KERNEL(__x,ptr); break; \ 139 default: __put_kernel_bad(); break; \ 140 } \ 141 } \ 142 else { \ 143 switch (sizeof(*(ptr))) { \ 144 case 1: __put_user_asm("stb",__x,ptr); break; \ 145 case 2: __put_user_asm("sth",__x,ptr); break; \ 146 case 4: __put_user_asm("stw",__x,ptr); break; \ 147 case 8: STD_USER(__x,ptr); break; \ 148 default: __put_user_bad(); break; \ 149 } \ 150 } \ 151 \ 152 __pu_err; \ 153}) 154 155/* 156 * The "__put_user/kernel_asm()" macros tell gcc they read from memory 157 * instead of writing. This is because they do not write to any memory 158 * gcc knows about, so there are no aliasing issues. These macros must 159 * also be aware that "fixup_put_user_skip_[12]" are executed in the 160 * context of the fault, and any registers used there must be listed 161 * as clobbers. In this case only "r1" is used by the current routines. 162 * r8/r9 are already listed as err/val. 163 */ 164 165#define __put_kernel_asm(stx,x,ptr) \ 166 __asm__ __volatile__ ( \ 167 "\n1:\t" stx "\t%2,0(%1)\n\t" \ 168 ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_1)\ 169 : "=r"(__pu_err) \ 170 : "r"(ptr), "r"(x), "0"(__pu_err) \ 171 : "r1") 172 173#define __put_user_asm(stx,x,ptr) \ 174 __asm__ __volatile__ ( \ 175 "\n1:\t" stx "\t%2,0(%%sr3,%1)\n\t" \ 176 ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_1)\ 177 : "=r"(__pu_err) \ 178 : "r"(ptr), "r"(x), "0"(__pu_err) \ 179 : "r1") 180 181 182#if !defined(CONFIG_64BIT) 183 184#define __put_kernel_asm64(__val,ptr) do { \ 185 u64 __val64 = (u64)(__val); \ 186 u32 hi = (__val64) >> 32; \ 187 u32 lo = (__val64) & 0xffffffff; \ 188 __asm__ __volatile__ ( \ 189 "\n1:\tstw %2,0(%1)" \ 190 "\n2:\tstw %3,4(%1)\n\t" \ 191 ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_2)\ 192 ASM_EXCEPTIONTABLE_ENTRY(2b,fixup_put_user_skip_1)\ 193 : "=r"(__pu_err) \ 194 : "r"(ptr), "r"(hi), "r"(lo), "0"(__pu_err) \ 195 : "r1"); \ 196} while (0) 197 198#define __put_user_asm64(__val,ptr) do { \ 199 u64 __val64 = (u64)(__val); \ 200 u32 hi = (__val64) >> 32; \ 201 u32 lo = (__val64) & 0xffffffff; \ 202 __asm__ __volatile__ ( \ 203 "\n1:\tstw %2,0(%%sr3,%1)" \ 204 "\n2:\tstw %3,4(%%sr3,%1)\n\t" \ 205 ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_2)\ 206 ASM_EXCEPTIONTABLE_ENTRY(2b,fixup_put_user_skip_1)\ 207 : "=r"(__pu_err) \ 208 : "r"(ptr), "r"(hi), "r"(lo), "0"(__pu_err) \ 209 : "r1"); \ 210} while (0) 211 212#endif /* !defined(CONFIG_64BIT) */ 213 214 215/* 216 * Complex access routines -- external declarations 217 */ 218 219extern unsigned long lcopy_to_user(void __user *, const void *, unsigned long); 220extern unsigned long lcopy_from_user(void *, const void __user *, unsigned long); 221extern unsigned long lcopy_in_user(void __user *, const void __user *, unsigned long); 222extern long lstrncpy_from_user(char *, const char __user *, long); 223extern unsigned lclear_user(void __user *,unsigned long); 224extern long lstrnlen_user(const char __user *,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 236unsigned long copy_to_user(void __user *dst, const void *src, unsigned long len); 237#define __copy_to_user copy_to_user 238unsigned long __copy_from_user(void *dst, const void __user *src, unsigned long len); 239unsigned long copy_in_user(void __user *dst, const void __user *src, unsigned long len); 240#define __copy_in_user copy_in_user 241#define __copy_to_user_inatomic __copy_to_user 242#define __copy_from_user_inatomic __copy_from_user 243 244extern void copy_from_user_overflow(void) 245#ifdef CONFIG_DEBUG_STRICT_USER_COPY_CHECKS 246 __compiletime_error("copy_from_user() buffer size is not provably correct") 247#else 248 __compiletime_warning("copy_from_user() buffer size is not provably correct") 249#endif 250; 251 252static inline unsigned long __must_check copy_from_user(void *to, 253 const void __user *from, 254 unsigned long n) 255{ 256 int sz = __compiletime_object_size(to); 257 int ret = -EFAULT; 258 259 if (likely(sz == -1 || !__builtin_constant_p(n) || sz >= n)) 260 ret = __copy_from_user(to, from, n); 261 else 262 copy_from_user_overflow(); 263 264 return ret; 265} 266 267struct pt_regs; 268int fixup_exception(struct pt_regs *regs); 269 270#endif /* __PARISC_UACCESS_H */ 271