FreeBSD/Linux Kernel Cross Reference
sys/include/asm-mips64/paccess.h

     /*
      * 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) ({ \
    long __gu_err; \
    __typeof(*(ptr)) __gu_val; \
    long __gu_addr; \
    __asm__("":"=r" (__gu_val)); \
    __gu_addr = (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__( \
            "1:\t" insn "\t%1,%2\n\t" \
            "move\t%0,$0\n" \
            "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" \
            ".dword\t1b,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) ({ \
    long __pu_err; \
    __typeof__(*(ptr)) __pu_val; \
    long __pu_addr; \
    __pu_val = (x); \
    __pu_addr = (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__( \
            "1:\t" insn "\t%1,%2\n\t" \
            "move\t%0,$0\n" \
            "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" \
            ".dword\t1b,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 */

Cache object: dc02ae00cf66ca46094ae5c04086a6b7