| 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/errno.h> |
|---|
| 17 | |
|---|
| 18 | #ifndef __mips64 |
|---|
| 19 | #define __PA_ADDR ".word" |
|---|
| 20 | #endif |
|---|
| 21 | #ifdef __mips64 |
|---|
| 22 | #define __PA_ADDR ".dword" |
|---|
| 23 | #endif |
|---|
| 24 | |
|---|
| 25 | extern asmlinkage void handle_ibe(void); |
|---|
| 26 | extern asmlinkage void handle_dbe(void); |
|---|
| 27 | |
|---|
| 28 | #define put_dbe(x,ptr) __put_dbe((x),(ptr),sizeof(*(ptr))) |
|---|
| 29 | #define get_dbe(x,ptr) __get_dbe((x),(ptr),sizeof(*(ptr))) |
|---|
| 30 | |
|---|
| 31 | struct __large_pstruct { unsigned long buf[100]; }; |
|---|
| 32 | #define __mp(x) (*(struct __large_pstruct *)(x)) |
|---|
| 33 | |
|---|
| 34 | #define __get_dbe(x,ptr,size) \ |
|---|
| 35 | ({ \ |
|---|
| 36 | long __gu_err; \ |
|---|
| 37 | __typeof(*(ptr)) __gu_val; \ |
|---|
| 38 | unsigned long __gu_addr; \ |
|---|
| 39 | __asm__("":"=r" (__gu_val)); \ |
|---|
| 40 | __gu_addr = (unsigned long) (ptr); \ |
|---|
| 41 | __asm__("":"=r" (__gu_err)); \ |
|---|
| 42 | switch (size) { \ |
|---|
| 43 | case 1: __get_dbe_asm("lb"); break; \ |
|---|
| 44 | case 2: __get_dbe_asm("lh"); break; \ |
|---|
| 45 | case 4: __get_dbe_asm("lw"); break; \ |
|---|
| 46 | case 8: __get_dbe_asm("ld"); break; \ |
|---|
| 47 | default: __get_dbe_unknown(); break; \ |
|---|
| 48 | } \ |
|---|
| 49 | x = (__typeof__(*(ptr))) __gu_val; \ |
|---|
| 50 | __gu_err; \ |
|---|
| 51 | }) |
|---|
| 52 | |
|---|
| 53 | #define __get_dbe_asm(insn) \ |
|---|
| 54 | ({ \ |
|---|
| 55 | __asm__ __volatile__( \ |
|---|
| 56 | "1:\t" insn "\t%1,%2\n\t" \ |
|---|
| 57 | "move\t%0,$0\n" \ |
|---|
| 58 | "2:\n\t" \ |
|---|
| 59 | ".section\t.fixup,\"ax\"\n" \ |
|---|
| 60 | "3:\tli\t%0,%3\n\t" \ |
|---|
| 61 | "move\t%1,$0\n\t" \ |
|---|
| 62 | "j\t2b\n\t" \ |
|---|
| 63 | ".previous\n\t" \ |
|---|
| 64 | ".section\t__dbe_table,\"a\"\n\t" \ |
|---|
| 65 | __PA_ADDR "\t1b, 3b\n\t" \ |
|---|
| 66 | ".previous" \ |
|---|
| 67 | :"=r" (__gu_err), "=r" (__gu_val) \ |
|---|
| 68 | :"o" (__mp(__gu_addr)), "i" (-EFAULT)); \ |
|---|
| 69 | }) |
|---|
| 70 | |
|---|
| 71 | extern void __get_dbe_unknown(void); |
|---|
| 72 | |
|---|
| 73 | #define __put_dbe(x,ptr,size) \ |
|---|
| 74 | ({ \ |
|---|
| 75 | long __pu_err; \ |
|---|
| 76 | __typeof__(*(ptr)) __pu_val; \ |
|---|
| 77 | long __pu_addr; \ |
|---|
| 78 | __pu_val = (x); \ |
|---|
| 79 | __pu_addr = (long) (ptr); \ |
|---|
| 80 | __asm__("":"=r" (__pu_err)); \ |
|---|
| 81 | switch (size) { \ |
|---|
| 82 | case 1: __put_dbe_asm("sb"); break; \ |
|---|
| 83 | case 2: __put_dbe_asm("sh"); break; \ |
|---|
| 84 | case 4: __put_dbe_asm("sw"); break; \ |
|---|
| 85 | case 8: __put_dbe_asm("sd"); break; \ |
|---|
| 86 | default: __put_dbe_unknown(); break; \ |
|---|
| 87 | } \ |
|---|
| 88 | __pu_err; \ |
|---|
| 89 | }) |
|---|
| 90 | |
|---|
| 91 | #define __put_dbe_asm(insn) \ |
|---|
| 92 | ({ \ |
|---|
| 93 | __asm__ __volatile__( \ |
|---|
| 94 | "1:\t" insn "\t%1,%2\n\t" \ |
|---|
| 95 | "move\t%0,$0\n" \ |
|---|
| 96 | "2:\n\t" \ |
|---|
| 97 | ".section\t.fixup,\"ax\"\n" \ |
|---|
| 98 | "3:\tli\t%0,%3\n\t" \ |
|---|
| 99 | "j\t2b\n\t" \ |
|---|
| 100 | ".previous\n\t" \ |
|---|
| 101 | ".section\t__dbe_table,\"a\"\n\t" \ |
|---|
| 102 | __PA_ADDR "\t1b, 3b\n\t" \ |
|---|
| 103 | ".previous" \ |
|---|
| 104 | : "=r" (__pu_err) \ |
|---|
| 105 | : "r" (__pu_val), "o" (__mp(__pu_addr)), "i" (-EFAULT)); \ |
|---|
| 106 | }) |
|---|
| 107 | |
|---|
| 108 | extern void __put_dbe_unknown(void); |
|---|
| 109 | |
|---|
| 110 | extern unsigned long search_dbe_table(unsigned long addr); |
|---|
| 111 | |
|---|
| 112 | #endif /* _ASM_PACCESS_H */ |
|---|
