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1275 |
phoenix |
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1996, 1997, 1998, 1999, 2000 by Ralf Baechle
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* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
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*
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* Protected memory access. Used for everything that might take revenge
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* by sending a DBE error like accessing possibly non-existant memory or
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* devices.
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*/
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#ifndef _ASM_PACCESS_H
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#define _ASM_PACCESS_H
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#include <linux/errno.h>
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#define put_dbe(x,ptr) __put_dbe((x),(ptr),sizeof(*(ptr)))
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#define get_dbe(x,ptr) __get_dbe((x),(ptr),sizeof(*(ptr)))
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struct __large_pstruct { unsigned long buf[100]; };
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#define __mp(x) (*(struct __large_pstruct *)(x))
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#define __get_dbe(x,ptr,size) ({ \
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long __gu_err; \
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__typeof(*(ptr)) __gu_val; \
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long __gu_addr; \
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__asm__("":"=r" (__gu_val)); \
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__gu_addr = (long) (ptr); \
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__asm__("":"=r" (__gu_err)); \
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switch (size) { \
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case 1: __get_dbe_asm("lb"); break; \
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case 2: __get_dbe_asm("lh"); break; \
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case 4: __get_dbe_asm("lw"); break; \
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case 8: __get_dbe_asm("ld"); break; \
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default: __get_dbe_unknown(); break; \
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} x = (__typeof__(*(ptr))) __gu_val; __gu_err; })
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#define __get_dbe_asm(insn) \
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({ \
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__asm__ __volatile__( \
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"1:\t" insn "\t%1,%2\n\t" \
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"move\t%0,$0\n" \
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"2:\n\t" \
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".section\t.fixup,\"ax\"\n" \
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"3:\tli\t%0,%3\n\t" \
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"move\t%1,$0\n\t" \
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"j\t2b\n\t" \
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".previous\n\t" \
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".section\t__dbe_table,\"a\"\n\t" \
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".dword\t1b,3b\n\t" \
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".previous" \
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:"=r" (__gu_err), "=r" (__gu_val) \
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:"o" (__mp(__gu_addr)), "i" (-EFAULT)); })
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extern void __get_dbe_unknown(void);
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#define __put_dbe(x,ptr,size) ({ \
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long __pu_err; \
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__typeof__(*(ptr)) __pu_val; \
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long __pu_addr; \
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__pu_val = (x); \
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__pu_addr = (long) (ptr); \
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__asm__("":"=r" (__pu_err)); \
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switch (size) { \
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case 1: __put_dbe_asm("sb"); break; \
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case 2: __put_dbe_asm("sh"); break; \
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case 4: __put_dbe_asm("sw"); break; \
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case 8: __put_dbe_asm("sd"); break; \
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default: __put_dbe_unknown(); break; \
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} __pu_err; })
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#define __put_dbe_asm(insn) \
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({ \
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__asm__ __volatile__( \
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"1:\t" insn "\t%1,%2\n\t" \
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"move\t%0,$0\n" \
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"2:\n\t" \
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".section\t.fixup,\"ax\"\n" \
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"3:\tli\t%0,%3\n\t" \
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"j\t2b\n\t" \
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".previous\n\t" \
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".section\t__dbe_table,\"a\"\n\t" \
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".dword\t1b,3b\n\t" \
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".previous" \
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:"=r" (__pu_err) \
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:"r" (__pu_val), "o" (__mp(__pu_addr)), "i" (-EFAULT)); })
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extern void __put_dbe_unknown(void);
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#endif /* _ASM_PACCESS_H */
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