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usr
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linux-headers-6.8.0-36
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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-existent memory or * devices. */ #ifndef _ASM_PACCESS_H #define _ASM_PACCESS_H #include <linux/errno.h> #ifdef CONFIG_32BIT #define __PA_ADDR ".word" #endif #ifdef CONFIG_64BIT #define __PA_ADDR ".dword" #endif extern asmlinkage void handle_ibe(void); extern asmlinkage void handle_dbe(void); #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; \ 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__( \ "1:\t" insn "\t%1,%2\n\t" \ "move\t%0,$0\n" \ "2:\n\t" \ ".insn\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" \ __PA_ADDR "\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" \ ".insn\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" \ __PA_ADDR "\t1b, 3b\n\t" \ ".previous" \ : "=r" (__pu_err) \ : "r" (__pu_val), "o" (__mp(__pu_addr)), "i" (-EFAULT)); \ } extern void __put_dbe_unknown(void); extern unsigned long search_dbe_table(unsigned long addr); #endif /* _ASM_PACCESS_H */
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