Gcc 4.0 fixes.
[linux-2.6.git] / include / asm-mips / paccess.h
1 /*
2  * This file is subject to the terms and conditions of the GNU General Public
3  * License.  See the file "COPYING" in the main directory of this archive
4  * for more details.
5  *
6  * Copyright (C) 1996, 1997, 1998, 1999, 2000 by Ralf Baechle
7  * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
8  *
9  * Protected memory access.  Used for everything that might take revenge
10  * by sending a DBE error like accessing possibly non-existant memory or
11  * devices.
12  */
13 #ifndef _ASM_PACCESS_H
14 #define _ASM_PACCESS_H
15
16 #include <linux/config.h>
17 #include <linux/errno.h>
18
19 #ifdef CONFIG_32BIT
20 #define __PA_ADDR       ".word"
21 #endif
22 #ifdef CONFIG_64BIT
23 #define __PA_ADDR       ".dword"
24 #endif
25
26 extern asmlinkage void handle_ibe(void);
27 extern asmlinkage void handle_dbe(void);
28
29 #define put_dbe(x,ptr) __put_dbe((x),(ptr),sizeof(*(ptr)))
30 #define get_dbe(x,ptr) __get_dbe((x),(ptr),sizeof(*(ptr)))
31
32 struct __large_pstruct { unsigned long buf[100]; };
33 #define __mp(x) (*(struct __large_pstruct *)(x))
34
35 #define __get_dbe(x,ptr,size)                                           \
36 ({                                                                      \
37         long __gu_err;                                                  \
38         __typeof(*(ptr)) __gu_val;                                      \
39         unsigned long __gu_addr;                                        \
40         __asm__("":"=r" (__gu_val));                                    \
41         __gu_addr = (unsigned long) (ptr);                              \
42         __asm__("":"=r" (__gu_err));                                    \
43         switch (size) {                                                 \
44         case 1: __get_dbe_asm("lb"); break;                             \
45         case 2: __get_dbe_asm("lh"); break;                             \
46         case 4: __get_dbe_asm("lw"); break;                             \
47         case 8:  __get_dbe_asm("ld"); break;                            \
48         default: __get_dbe_unknown(); break;                            \
49         }                                                               \
50         x = (__typeof__(*(ptr))) __gu_val;                              \
51         __gu_err;                                                       \
52 })
53
54 #define __get_dbe_asm(insn)                                             \
55 {                                                                       \
56         __asm__ __volatile__(                                           \
57         "1:\t" insn "\t%1,%2\n\t"                                       \
58         "move\t%0,$0\n"                                                 \
59         "2:\n\t"                                                        \
60         ".section\t.fixup,\"ax\"\n"                                     \
61         "3:\tli\t%0,%3\n\t"                                             \
62         "move\t%1,$0\n\t"                                               \
63         "j\t2b\n\t"                                                     \
64         ".previous\n\t"                                                 \
65         ".section\t__dbe_table,\"a\"\n\t"                               \
66         __PA_ADDR "\t1b, 3b\n\t"                                        \
67         ".previous"                                                     \
68         :"=r" (__gu_err), "=r" (__gu_val)                               \
69         :"o" (__mp(__gu_addr)), "i" (-EFAULT));                         \
70 }
71
72 extern void __get_dbe_unknown(void);
73
74 #define __put_dbe(x,ptr,size)                                           \
75 ({                                                                      \
76         long __pu_err;                                                  \
77         __typeof__(*(ptr)) __pu_val;                                    \
78         long __pu_addr;                                                 \
79         __pu_val = (x);                                                 \
80         __pu_addr = (long) (ptr);                                       \
81         __asm__("":"=r" (__pu_err));                                    \
82         switch (size) {                                                 \
83         case 1: __put_dbe_asm("sb"); break;                             \
84         case 2: __put_dbe_asm("sh"); break;                             \
85         case 4: __put_dbe_asm("sw"); break;                             \
86         case 8: __put_dbe_asm("sd"); break;                             \
87         default: __put_dbe_unknown(); break;                            \
88         }                                                               \
89         __pu_err;                                                       \
90 })
91
92 #define __put_dbe_asm(insn)                                             \
93 {                                                                       \
94         __asm__ __volatile__(                                           \
95         "1:\t" insn "\t%1,%2\n\t"                                       \
96         "move\t%0,$0\n"                                                 \
97         "2:\n\t"                                                        \
98         ".section\t.fixup,\"ax\"\n"                                     \
99         "3:\tli\t%0,%3\n\t"                                             \
100         "j\t2b\n\t"                                                     \
101         ".previous\n\t"                                                 \
102         ".section\t__dbe_table,\"a\"\n\t"                               \
103         __PA_ADDR "\t1b, 3b\n\t"                                        \
104         ".previous"                                                     \
105         : "=r" (__pu_err)                                               \
106         : "r" (__pu_val), "o" (__mp(__pu_addr)), "i" (-EFAULT));        \
107 }
108
109 extern void __put_dbe_unknown(void);
110
111 extern unsigned long search_dbe_table(unsigned long addr);
112
113 #endif /* _ASM_PACCESS_H */