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[/] [or1k/] [tags/] [LINUX_2_4_26_OR32/] [linux/] [linux-2.4/] [include/] [asm-mips/] [paccess.h] - Rev 1765
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/* * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 1996, 1997, 1998, 1999, 2000 by Ralf Baechle * Copyright (C) 1999, 2000 Silicon Graphics, Inc. * * Protected memory access. Used for everything that might take revenge * by sending a DBE error like accessing possibly non-existant memory or * devices. */ #ifndef _ASM_PACCESS_H #define _ASM_PACCESS_H #include <linux/errno.h> #define put_dbe(x,ptr) __put_dbe((x),(ptr),sizeof(*(ptr))) #define get_dbe(x,ptr) __get_dbe((x),(ptr),sizeof(*(ptr))) struct __large_pstruct { unsigned long buf[100]; }; #define __mp(x) (*(struct __large_pstruct *)(x)) #define __get_dbe(x,ptr,size) ({ \ int __gu_err; \ __typeof(*(ptr)) __gu_val; \ unsigned long __gu_addr; \ __asm__("":"=r" (__gu_val)); \ __gu_addr = (unsigned long) (ptr); \ __asm__("":"=r" (__gu_err)); \ switch (size) { \ case 1: __get_dbe_asm("lb"); break; \ case 2: __get_dbe_asm("lh"); break; \ case 4: __get_dbe_asm("lw"); break; \ case 8: __get_dbe_asm("ld"); break; \ default: __get_dbe_unknown(); break; \ } x = (__typeof__(*(ptr))) __gu_val; __gu_err; }) #define __get_dbe_asm(insn) \ ({ \ __asm__ __volatile__( \ ".set\tpush\n\t" \ ".set\tnoreorder\n\t" \ insn "\t%1,%2\n\t" \ "1:\tmove\t%0,$0\n" \ ".set\tpop\n\t" \ "2:\n\t" \ ".section\t.fixup,\"ax\"\n" \ "3:\tli\t%0,%3\n\t" \ "move\t%1,$0\n\t" \ "j\t2b\n\t" \ ".previous\n\t" \ ".section\t__dbe_table,\"a\"\n\t" \ ".word\t1b-4,3b\n\t" \ ".previous" \ :"=r" (__gu_err), "=r" (__gu_val) \ :"o" (__mp(__gu_addr)), "i" (-EFAULT)); }) extern void __get_dbe_unknown(void); #define __put_dbe(x,ptr,size) ({ \ int __pu_err; \ __typeof__(*(ptr)) __pu_val; \ unsigned long __pu_addr; \ __pu_val = (x); \ __pu_addr = (unsigned long) (ptr); \ __asm__("":"=r" (__pu_err)); \ switch (size) { \ case 1: __put_dbe_asm("sb"); break; \ case 2: __put_dbe_asm("sh"); break; \ case 4: __put_dbe_asm("sw"); break; \ case 8: __put_dbe_asm("sd"); break; \ default: __put_dbe_unknown(); break; \ } __pu_err; }) #define __put_dbe_asm(insn) \ ({ \ __asm__ __volatile__( \ ".set\tpush\n\t" \ ".set\tnoreorder\n\t" \ insn "\t%1,%2\n\t" \ "1:\tmove\t%0,$0\n" \ ".set\tpop\n\t" \ "2:\n\t" \ ".section\t.fixup,\"ax\"\n" \ "3:\tli\t%0,%3\n\t" \ "j\t2b\n\t" \ ".previous\n\t" \ ".section\t__dbe_table,\"a\"\n\t" \ ".word\t1b-4,3b\n\t" \ ".previous" \ :"=r" (__pu_err) \ :"r" (__pu_val), "o" (__mp(__pu_addr)), "i" (-EFAULT)); }) extern void __put_dbe_unknown(void); #endif /* _ASM_PACCESS_H */