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
6 * Copyright (C) 1996, 1997, 1998, 1999, 2000 by Ralf Baechle
7 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
9 * Protected memory access. Used for everything that might take revenge
10 * by sending a DBE error like accessing possibly non-existant memory or
13 #ifndef _ASM_PACCESS_H
14 #define _ASM_PACCESS_H
16 #include <linux/errno.h>
18 #define put_dbe(x,ptr) __put_dbe((x),(ptr),sizeof(*(ptr)))
19 #define get_dbe(x,ptr) __get_dbe((x),(ptr),sizeof(*(ptr)))
21 struct __large_pstruct { unsigned long buf[100]; };
22 #define __mp(x) (*(struct __large_pstruct *)(x))
24 #define __get_dbe(x,ptr,size) ({ \
26 __typeof(*(ptr)) __gu_val; \
27 unsigned long __gu_addr; \
28 __asm__("":"=r" (__gu_val)); \
29 __gu_addr = (unsigned long) (ptr); \
30 __asm__("":"=r" (__gu_err)); \
32 case 1: __get_dbe_asm("lb"); break; \
33 case 2: __get_dbe_asm("lh"); break; \
34 case 4: __get_dbe_asm("lw"); break; \
35 case 8: __get_dbe_asm("ld"); break; \
36 default: __get_dbe_unknown(); break; \
37 } x = (__typeof__(*(ptr))) __gu_val; __gu_err; })
39 #define __get_dbe_asm(insn) \
41 __asm__ __volatile__( \
43 ".set\tnoreorder\n\t" \
48 ".section\t.fixup,\"ax\"\n" \
53 ".section\t__dbe_table,\"a\"\n\t" \
54 ".word\t1b-4,3b\n\t" \
56 :"=r" (__gu_err), "=r" (__gu_val) \
57 :"o" (__mp(__gu_addr)), "i" (-EFAULT)); })
59 extern void __get_dbe_unknown(void);
61 #define __put_dbe(x,ptr,size) ({ \
63 __typeof__(*(ptr)) __pu_val; \
64 unsigned long __pu_addr; \
66 __pu_addr = (unsigned long) (ptr); \
67 __asm__("":"=r" (__pu_err)); \
69 case 1: __put_dbe_asm("sb"); break; \
70 case 2: __put_dbe_asm("sh"); break; \
71 case 4: __put_dbe_asm("sw"); break; \
72 case 8: __put_dbe_asm("sd"); break; \
73 default: __put_dbe_unknown(); break; \
76 #define __put_dbe_asm(insn) \
78 __asm__ __volatile__( \
80 ".set\tnoreorder\n\t" \
85 ".section\t.fixup,\"ax\"\n" \
89 ".section\t__dbe_table,\"a\"\n\t" \
90 ".word\t1b-4,3b\n\t" \
93 :"r" (__pu_val), "o" (__mp(__pu_addr)), "i" (-EFAULT)); })
95 extern void __put_dbe_unknown(void);
97 #endif /* _ASM_PACCESS_H */