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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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a4c9bb7d22
[Robert's original log message said this was a bug but it isn't, it's just very old fashioned syntax that is not (no longer?) documented in the gcc documentation. So for the sake of uniformity I'm applying his patch but with a modified log message. -- Ralf] Signed-off-by: Robert P. J. Day <rpjday@mindspring.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
112 lines
3 KiB
C
112 lines
3 KiB
C
/*
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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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#ifdef CONFIG_32BIT
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#define __PA_ADDR ".word"
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#endif
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#ifdef CONFIG_64BIT
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#define __PA_ADDR ".dword"
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#endif
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extern asmlinkage void handle_ibe(void);
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extern asmlinkage void handle_dbe(void);
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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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({ \
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long __gu_err; \
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__typeof__(*(ptr)) __gu_val; \
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unsigned long __gu_addr; \
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__asm__("":"=r" (__gu_val)); \
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__gu_addr = (unsigned 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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} \
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x = (__typeof__(*(ptr))) __gu_val; \
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__gu_err; \
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})
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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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__PA_ADDR "\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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}
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extern void __get_dbe_unknown(void);
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#define __put_dbe(x,ptr,size) \
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({ \
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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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} \
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__pu_err; \
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})
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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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__PA_ADDR "\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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}
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extern void __put_dbe_unknown(void);
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extern unsigned long search_dbe_table(unsigned long addr);
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#endif /* _ASM_PACCESS_H */
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