1 /* $Id: paccess.h,v 1.2 2000/01/21 22:34:07 ralf Exp $
2 *
3 * This file is subject to the terms and conditions of the GNU General Public
4 * License. See the file "COPYING" in the main directory of this archive
5 * for more details.
6 *
7 * Copyright (C) 1996, 1997, 1998, 1999, 2000 by Ralf Baechle
8 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
9 *
10 * Protected memory access. Used for everything that might take revenge
11 * by sending a DBE error like accessing possibly non-existant memory or
12 * devices.
13 */
14 #ifndef _ASM_PACCESS_H
15 #define _ASM_PACCESS_H
16
17 #include <linux/errno.h>
18
19 #define put_dbe(x,ptr) __put_dbe((x),(ptr),sizeof(*(ptr)))
20 #define get_dbe(x,ptr) __get_dbe((x),(ptr),sizeof(*(ptr)))
21
22 struct __large_pstruct { unsigned long buf[100]; };
23 #define __mp(x) (*(struct __large_pstruct *)(x))
24
25 #define __get_dbe(x,ptr,size) ({ \
26 long __gu_err; \
27 __typeof(*(ptr)) __gu_val; \
28 long __gu_addr; \
29 __asm__("":"=r" (__gu_val)); \
30 __gu_addr = (long) (ptr); \
31 __asm__("":"=r" (__gu_err)); \
32 switch (size) { \
33 case 1: __get_dbe_asm("lb"); break; \
34 case 2: __get_dbe_asm("lh"); break; \
35 case 4: __get_dbe_asm("lw"); break; \
36 case 8: __get_dbe_asm("ld"); break; \
37 default: __get_dbe_unknown(); break; \
38 } x = (__typeof__(*(ptr))) __gu_val; __gu_err; })
39
40 #define __get_dbe_asm(insn) \
41 ({ \
42 __asm__ __volatile__( \
43 "1:\t" insn "\t%1,%2\n\t" \
44 "move\t%0,$0\n" \
45 "2:\n\t" \
46 ".section\t.fixup,\"ax\"\n" \
47 "3:\tli\t%0,%3\n\t" \
48 "move\t%1,$0\n\t" \
49 "j\t2b\n\t" \
50 ".previous\n\t" \
51 ".section\t__dbe_table,\"a\"\n\t" \
52 ".dword\t1b,3b\n\t" \
53 ".previous" \
54 :"=r" (__gu_err), "=r" (__gu_val) \
55 :"o" (__mp(__gu_addr)), "i" (-EFAULT)); })
56
57 extern void __get_dbe_unknown(void);
58
59 #define __put_dbe(x,ptr,size) ({ \
60 long __pu_err; \
61 __typeof__(*(ptr)) __pu_val; \
62 long __pu_addr; \
63 __pu_val = (x); \
64 __pu_addr = (long) (ptr); \
65 __asm__("":"=r" (__pu_err)); \
66 switch (size) { \
67 case 1: __put_dbe_asm("sb"); break; \
68 case 2: __put_dbe_asm("sh"); break; \
69 case 4: __put_dbe_asm("sw"); break; \
70 case 8: __put_dbe_asm("sd"); break; \
71 default: __put_dbe_unknown(); break; \
72 } __pu_err; })
73
74 #define __put_dbe_asm(insn) \
75 ({ \
76 __asm__ __volatile__( \
77 "1:\t" insn "\t%1,%2\n\t" \
78 "move\t%0,$0\n" \
79 "2:\n\t" \
80 ".section\t.fixup,\"ax\"\n" \
81 "3:\tli\t%0,%3\n\t" \
82 "j\t2b\n\t" \
83 ".previous\n\t" \
84 ".section\t__dbe_table,\"a\"\n\t" \
85 ".dword\t1b,3b\n\t" \
86 ".previous" \
87 :"=r" (__pu_err) \
88 :"r" (__pu_val), "o" (__mp(__pu_addr)), "i" (-EFAULT)); })
89
90 extern void __put_dbe_unknown(void);
91
92 #endif /* _ASM_PACCESS_H */
93
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