[PARISC] add ASM_EXCEPTIONTABLE_ENTRY() macro
[sfrench/cifs-2.6.git] / include / asm-parisc / uaccess.h
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-generic/uaccess.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_thread_info()->addr_limit)
22 #define set_fs(x)       (current_thread_info()->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().
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 extern int __get_kernel_bad(void);
32 extern int __get_user_bad(void);
33 extern int __put_kernel_bad(void);
34 extern int __put_user_bad(void);
35
36 static inline long access_ok(int type, const void __user * addr,
37                 unsigned long size)
38 {
39         return 1;
40 }
41
42 #define put_user __put_user
43 #define get_user __get_user
44
45 #if !defined(CONFIG_64BIT)
46 #define LDD_KERNEL(ptr)         __get_kernel_bad();
47 #define LDD_USER(ptr)           __get_user_bad();
48 #define STD_KERNEL(x, ptr)      __put_kernel_asm64(x,ptr)
49 #define STD_USER(x, ptr)        __put_user_asm64(x,ptr)
50 #define ASM_WORD_INSN           ".word\t"
51 #else
52 #define LDD_KERNEL(ptr)         __get_kernel_asm("ldd",ptr)
53 #define LDD_USER(ptr)           __get_user_asm("ldd",ptr)
54 #define STD_KERNEL(x, ptr)      __put_kernel_asm("std",x,ptr)
55 #define STD_USER(x, ptr)        __put_user_asm("std",x,ptr)
56 #define ASM_WORD_INSN           ".dword\t"
57 #endif
58
59 /*
60  * The exception table contains two values: the first is an address
61  * for an instruction that is allowed to fault, and the second is
62  * the address to the fixup routine. 
63  */
64
65 struct exception_table_entry {
66         unsigned long insn;  /* address of insn that is allowed to fault.   */
67         long fixup;          /* fixup routine */
68 };
69
70 #define ASM_EXCEPTIONTABLE_ENTRY( fault_addr, except_addr )\
71         ".section __ex_table,\"aw\"\n"                     \
72         ASM_WORD_INSN #fault_addr ", " #except_addr "\n\t" \
73         ".previous\n"
74
75 /*
76  * The page fault handler stores, in a per-cpu area, the following information
77  * if a fixup routine is available.
78  */
79 struct exception_data {
80         unsigned long fault_ip;
81         unsigned long fault_space;
82         unsigned long fault_addr;
83 };
84
85 #define __get_user(x,ptr)                               \
86 ({                                                      \
87         register long __gu_err __asm__ ("r8") = 0;      \
88         register long __gu_val __asm__ ("r9") = 0;      \
89                                                         \
90         if (segment_eq(get_fs(),KERNEL_DS)) {           \
91             switch (sizeof(*(ptr))) {                   \
92             case 1: __get_kernel_asm("ldb",ptr); break; \
93             case 2: __get_kernel_asm("ldh",ptr); break; \
94             case 4: __get_kernel_asm("ldw",ptr); break; \
95             case 8: LDD_KERNEL(ptr); break;             \
96             default: __get_kernel_bad(); break;         \
97             }                                           \
98         }                                               \
99         else {                                          \
100             switch (sizeof(*(ptr))) {                   \
101             case 1: __get_user_asm("ldb",ptr); break;   \
102             case 2: __get_user_asm("ldh",ptr); break;   \
103             case 4: __get_user_asm("ldw",ptr); break;   \
104             case 8: LDD_USER(ptr);  break;              \
105             default: __get_user_bad(); break;           \
106             }                                           \
107         }                                               \
108                                                         \
109         (x) = (__typeof__(*(ptr))) __gu_val;            \
110         __gu_err;                                       \
111 })
112
113 #define __get_kernel_asm(ldx,ptr)                       \
114         __asm__("\n1:\t" ldx "\t0(%2),%0\n\t"           \
115                 ASM_EXCEPTIONTABLE_ENTRY(1b, fixup_get_user_skip_1)\
116                 : "=r"(__gu_val), "=r"(__gu_err)        \
117                 : "r"(ptr), "1"(__gu_err)               \
118                 : "r1");
119
120 #define __get_user_asm(ldx,ptr)                         \
121         __asm__("\n1:\t" ldx "\t0(%%sr3,%2),%0\n\t"     \
122                 ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_get_user_skip_1)\
123                 : "=r"(__gu_val), "=r"(__gu_err)        \
124                 : "r"(ptr), "1"(__gu_err)               \
125                 : "r1");
126
127 #define __put_user(x,ptr)                                       \
128 ({                                                              \
129         register long __pu_err __asm__ ("r8") = 0;              \
130         __typeof__(*(ptr)) __x = (__typeof__(*(ptr)))(x);       \
131                                                                 \
132         if (segment_eq(get_fs(),KERNEL_DS)) {                   \
133             switch (sizeof(*(ptr))) {                           \
134             case 1: __put_kernel_asm("stb",__x,ptr); break;     \
135             case 2: __put_kernel_asm("sth",__x,ptr); break;     \
136             case 4: __put_kernel_asm("stw",__x,ptr); break;     \
137             case 8: STD_KERNEL(__x,ptr); break;                 \
138             default: __put_kernel_bad(); break;                 \
139             }                                                   \
140         }                                                       \
141         else {                                                  \
142             switch (sizeof(*(ptr))) {                           \
143             case 1: __put_user_asm("stb",__x,ptr); break;       \
144             case 2: __put_user_asm("sth",__x,ptr); break;       \
145             case 4: __put_user_asm("stw",__x,ptr); break;       \
146             case 8: STD_USER(__x,ptr); break;                   \
147             default: __put_user_bad(); break;                   \
148             }                                                   \
149         }                                                       \
150                                                                 \
151         __pu_err;                                               \
152 })
153
154 /*
155  * The "__put_user/kernel_asm()" macros tell gcc they read from memory
156  * instead of writing. This is because they do not write to any memory
157  * gcc knows about, so there are no aliasing issues. These macros must
158  * also be aware that "fixup_put_user_skip_[12]" are executed in the
159  * context of the fault, and any registers used there must be listed
160  * as clobbers. In this case only "r1" is used by the current routines.
161  * r8/r9 are already listed as err/val.
162  */
163
164 #define __put_kernel_asm(stx,x,ptr)                         \
165         __asm__ __volatile__ (                              \
166                 "\n1:\t" stx "\t%2,0(%1)\n\t"               \
167                 ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_1)\
168                 : "=r"(__pu_err)                            \
169                 : "r"(ptr), "r"(x), "0"(__pu_err)           \
170                 : "r1")
171
172 #define __put_user_asm(stx,x,ptr)                           \
173         __asm__ __volatile__ (                              \
174                 "\n1:\t" stx "\t%2,0(%%sr3,%1)\n\t"         \
175                 ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_1)\
176                 : "=r"(__pu_err)                            \
177                 : "r"(ptr), "r"(x), "0"(__pu_err)           \
178                 : "r1")
179
180
181 #if !defined(CONFIG_64BIT)
182
183 #define __put_kernel_asm64(__val,ptr) do {                  \
184         u64 __val64 = (u64)(__val);                         \
185         u32 hi = (__val64) >> 32;                           \
186         u32 lo = (__val64) & 0xffffffff;                    \
187         __asm__ __volatile__ (                              \
188                 "\n1:\tstw %2,0(%1)"                        \
189                 "\n2:\tstw %3,4(%1)\n\t"                    \
190                 ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_2)\
191                 ASM_EXCEPTIONTABLE_ENTRY(2b,fixup_put_user_skip_1)\
192                 : "=r"(__pu_err)                            \
193                 : "r"(ptr), "r"(hi), "r"(lo), "0"(__pu_err) \
194                 : "r1");                                    \
195 } while (0)
196
197 #define __put_user_asm64(__val,ptr) do {                    \
198         u64 __val64 = (u64)(__val);                         \
199         u32 hi = (__val64) >> 32;                           \
200         u32 lo = (__val64) & 0xffffffff;                    \
201         __asm__ __volatile__ (                              \
202                 "\n1:\tstw %2,0(%%sr3,%1)"                  \
203                 "\n2:\tstw %3,4(%%sr3,%1)\n\t"              \
204                 ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_2)\
205                 ASM_EXCEPTIONTABLE_ENTRY(2b,fixup_put_user_skip_1)\
206                 : "=r"(__pu_err)                            \
207                 : "r"(ptr), "r"(hi), "r"(lo), "0"(__pu_err) \
208                 : "r1");                                    \
209 } while (0)
210
211 #endif /* !defined(CONFIG_64BIT) */
212
213
214 /*
215  * Complex access routines -- external declarations
216  */
217
218 extern unsigned long lcopy_to_user(void __user *, const void *, unsigned long);
219 extern unsigned long lcopy_from_user(void *, const void __user *, unsigned long);
220 extern unsigned long lcopy_in_user(void __user *, const void __user *, unsigned long);
221 extern long lstrncpy_from_user(char *, const char __user *, long);
222 extern unsigned lclear_user(void __user *,unsigned long);
223 extern long lstrnlen_user(const char __user *,long);
224
225 /*
226  * Complex access routines -- macros
227  */
228
229 #define strncpy_from_user lstrncpy_from_user
230 #define strnlen_user lstrnlen_user
231 #define strlen_user(str) lstrnlen_user(str, 0x7fffffffL)
232 #define clear_user lclear_user
233 #define __clear_user lclear_user
234
235 unsigned long copy_to_user(void __user *dst, const void *src, unsigned long len);
236 #define __copy_to_user copy_to_user
237 unsigned long copy_from_user(void *dst, const void __user *src, unsigned long len);
238 #define __copy_from_user copy_from_user
239 unsigned 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
244 #endif /* __PARISC_UACCESS_H */