| 1 | |
| 2 | * This file is subject to the terms and conditions of the GNU General Public
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| 3 | * License. See the file "COPYING" in the main directory of this archive
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| 4 | * for more details.
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| 5 | *
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| 6 | * Copyright (C) 1996, 1997, 1998, 1999, 2000 by Ralf Baechle
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| 7 | * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
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| 8 | *
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| 9 | * Protected memory access. Used for everything that might take revenge
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| 10 | * by sending a DBE error like accessing possibly non-existent memory or
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| 11 | * devices.
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| 12 |
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| 13 | #ifndef _ASM_PACCESS_H
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| 14 | #define _ASM_PACCESS_H
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| 15 |
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| 16 | #include <linux/errno.h>
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| 17 |
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| 18 | #ifdef CONFIG_32BIT
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| 19 | #define __PA_ADDR ".word"
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| 20 | #endif
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| 21 | #ifdef CONFIG_64BIT
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| 22 | #define __PA_ADDR ".dword"
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| 23 | #endif
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| 24 |
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| 25 | extern asmlinkage void handle_ibe(void);
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| 26 | extern asmlinkage void handle_dbe(void);
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| 27 |
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| 28 | #define put_dbe(x, ptr) __put_dbe((x), (ptr), sizeof(*(ptr)))
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| 29 | #define get_dbe(x, ptr) __get_dbe((x), (ptr), sizeof(*(ptr)))
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| 30 |
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| 31 | struct __large_pstruct { unsigned long buf[100]; };
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| 32 | #define __mp(x) (*(struct __large_pstruct *)(x))
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| 33 |
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| 34 | #define __get_dbe(x, ptr, size) \
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| 35 | ({ \
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| 36 | long __gu_err; \
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| 37 | __typeof__(*(ptr)) __gu_val; \
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| 38 | unsigned long __gu_addr; \
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| 39 | __asm__("":"=r" (__gu_val)); \
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| 40 | __gu_addr = (unsigned long) (ptr); \
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| 41 | __asm__("":"=r" (__gu_err)); \
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| 42 | switch (size) { \
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| 43 | case 1: __get_dbe_asm("lb"); break; \
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| 44 | case 2: __get_dbe_asm("lh"); break; \
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| 45 | case 4: __get_dbe_asm("lw"); break; \
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| 46 | case 8: __get_dbe_asm("ld"); break; \
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| 47 | default: __get_dbe_unknown(); break; \
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| 48 | } \
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| 49 | x = (__typeof__(*(ptr))) __gu_val; \
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| 50 | __gu_err; \
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| 51 | })
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| 52 |
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| 53 | #define __get_dbe_asm(insn) \
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| 54 | { \
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| 55 | __asm__ __volatile__( \
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| 56 | "1:\t" insn "\t%1,%2\n\t" \
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| 57 | "move\t%0,$0\n" \
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| 58 | "2:\n\t" \
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| 59 | ".insn\n\t" \
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| 60 | ".section\t.fixup,\"ax\"\n" \
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| 61 | "3:\tli\t%0,%3\n\t" \
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| 62 | "move\t%1,$0\n\t" \
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| 63 | "j\t2b\n\t" \
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| 64 | ".previous\n\t" \
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| 65 | ".section\t__dbe_table,\"a\"\n\t" \
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| 66 | __PA_ADDR "\t1b, 3b\n\t" \
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| 67 | ".previous" \
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| 68 | :"=r" (__gu_err), "=r" (__gu_val) \
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| 69 | :"o" (__mp(__gu_addr)), "i" (-EFAULT)); \
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| 70 | }
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| 71 |
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| 72 | extern void __get_dbe_unknown(void);
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| 73 |
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| 74 | #define __put_dbe(x, ptr, size) \
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| 75 | ({ \
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| 76 | long __pu_err; \
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| 77 | __typeof__(*(ptr)) __pu_val; \
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| 78 | long __pu_addr; \
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| 79 | __pu_val = (x); \
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| 80 | __pu_addr = (long) (ptr); \
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| 81 | __asm__("":"=r" (__pu_err)); \
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| 82 | switch (size) { \
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| 83 | case 1: __put_dbe_asm("sb"); break; \
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| 84 | case 2: __put_dbe_asm("sh"); break; \
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| 85 | case 4: __put_dbe_asm("sw"); break; \
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| 86 | case 8: __put_dbe_asm("sd"); break; \
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| 87 | default: __put_dbe_unknown(); break; \
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| 88 | } \
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| 89 | __pu_err; \
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| 90 | })
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| 91 |
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| 92 | #define __put_dbe_asm(insn) \
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| 93 | { \
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| 94 | __asm__ __volatile__( \
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| 95 | "1:\t" insn "\t%1,%2\n\t" \
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| 96 | "move\t%0,$0\n" \
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| 97 | "2:\n\t" \
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| 98 | ".insn\n\t" \
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| 99 | ".section\t.fixup,\"ax\"\n" \
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| 100 | "3:\tli\t%0,%3\n\t" \
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| 101 | "j\t2b\n\t" \
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| 102 | ".previous\n\t" \
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| 103 | ".section\t__dbe_table,\"a\"\n\t" \
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| 104 | __PA_ADDR "\t1b, 3b\n\t" \
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| 105 | ".previous" \
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| 106 | : "=r" (__pu_err) \
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| 107 | : "r" (__pu_val), "o" (__mp(__pu_addr)), "i" (-EFAULT)); \
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| 108 | }
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| 109 |
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| 110 | extern void __put_dbe_unknown(void);
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| 111 |
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| 112 | extern unsigned long search_dbe_table(unsigned long addr);
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| 113 |
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| 114 | #endif
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