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 #define put_dbe(x,ptr) __put_dbe((x),(ptr),sizeof(*(ptr))) 19 #define get_dbe(x,ptr) __get_dbe((x),(ptr),sizeof(*(ptr))) 20 21 struct __large_pstruct { unsigned long buf[100]; }; 22 #define __mp(x) (*(struct __large_pstruct *)(x)) 23 24 #define __get_dbe(x,ptr,size) ({ \ 25 long __gu_err; \ 26 __typeof(*(ptr)) __gu_val; \ 27 long __gu_addr; \ 28 __asm__("":"=r" (__gu_val)); \ 29 __gu_addr = (long) (ptr); \ 30 __asm__("":"=r" (__gu_err)); \ 31 switch (size) { \ 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; }) 38 39 #define __get_dbe_asm(insn) \ 40 ({ \ 41 __asm__ __volatile__( \ 42 "1:\t" insn "\t%1,%2\n\t" \ 43 "move\t%0,$0\n" \ 44 "2:\n\t" \ 45 ".section\t.fixup,\"ax\"\n" \ 46 "3:\tli\t%0,%3\n\t" \ 47 "move\t%1,$0\n\t" \ 48 "j\t2b\n\t" \ 49 ".previous\n\t" \ 50 ".section\t__dbe_table,\"a\"\n\t" \ 51 ".dword\t1b,3b\n\t" \ 52 ".previous" \ 53 :"=r" (__gu_err), "=r" (__gu_val) \ 54 :"o" (__mp(__gu_addr)), "i" (-EFAULT)); }) 55 56 extern void __get_dbe_unknown(void); 57 58 #define __put_dbe(x,ptr,size) ({ \ 59 long __pu_err; \ 60 __typeof__(*(ptr)) __pu_val; \ 61 long __pu_addr; \ 62 __pu_val = (x); \ 63 __pu_addr = (long) (ptr); \ 64 __asm__("":"=r" (__pu_err)); \ 65 switch (size) { \ 66 case 1: __put_dbe_asm("sb"); break; \ 67 case 2: __put_dbe_asm("sh"); break; \ 68 case 4: __put_dbe_asm("sw"); break; \ 69 case 8: __put_dbe_asm("sd"); break; \ 70 default: __put_dbe_unknown(); break; \ 71 } __pu_err; }) 72 73 #define __put_dbe_asm(insn) \ 74 ({ \ 75 __asm__ __volatile__( \ 76 "1:\t" insn "\t%1,%2\n\t" \ 77 "move\t%0,$0\n" \ 78 "2:\n\t" \ 79 ".section\t.fixup,\"ax\"\n" \ 80 "3:\tli\t%0,%3\n\t" \ 81 "j\t2b\n\t" \ 82 ".previous\n\t" \ 83 ".section\t__dbe_table,\"a\"\n\t" \ 84 ".dword\t1b,3b\n\t" \ 85 ".previous" \ 86 :"=r" (__pu_err) \ 87 :"r" (__pu_val), "o" (__mp(__pu_addr)), "i" (-EFAULT)); }) 88 89 extern void __put_dbe_unknown(void); 90 91 #endif /* _ASM_PACCESS_H */ 92