cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

paccess.h (3140B)

      1/*
      2 * This file is subject to the terms and conditions of the GNU General Public
      3 * License.  See the file "COPYING" in the main directory of this archive
      4 * for more details.
      5 *
      6 * Copyright (C) 1996, 1997, 1998, 1999, 2000 by Ralf Baechle
      7 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
      8 *
      9 * Protected memory access.  Used for everything that might take revenge
     10 * by sending a DBE error like accessing possibly non-existent memory or
     11 * devices.
     12 */
     13#ifndef _ASM_PACCESS_H
     14#define _ASM_PACCESS_H
     15
     16#include <linux/errno.h>
     17
     18#ifdef CONFIG_32BIT
     19#define __PA_ADDR	".word"
     20#endif
     21#ifdef CONFIG_64BIT
     22#define __PA_ADDR	".dword"
     23#endif
     24
     25extern asmlinkage void handle_ibe(void);
     26extern asmlinkage void handle_dbe(void);
     27
     28#define put_dbe(x, ptr) __put_dbe((x), (ptr), sizeof(*(ptr)))
     29#define get_dbe(x, ptr) __get_dbe((x), (ptr), sizeof(*(ptr)))
     30
     31struct __large_pstruct { unsigned long buf[100]; };
     32#define __mp(x) (*(struct __large_pstruct *)(x))
     33
     34#define __get_dbe(x, ptr, size)						\
     35({									\
     36	long __gu_err;							\
     37	__typeof__(*(ptr)) __gu_val;					\
     38	unsigned long __gu_addr;					\
     39	__asm__("":"=r" (__gu_val));					\
     40	__gu_addr = (unsigned long) (ptr);				\
     41	__asm__("":"=r" (__gu_err));					\
     42	switch (size) {							\
     43	case 1: __get_dbe_asm("lb"); break;				\
     44	case 2: __get_dbe_asm("lh"); break;				\
     45	case 4: __get_dbe_asm("lw"); break;				\
     46	case 8:	 __get_dbe_asm("ld"); break;				\
     47	default: __get_dbe_unknown(); break;				\
     48	}								\
     49	x = (__typeof__(*(ptr))) __gu_val;				\
     50	__gu_err;							\
     51})
     52
     53#define __get_dbe_asm(insn)						\
     54{									\
     55	__asm__ __volatile__(						\
     56	"1:\t" insn "\t%1,%2\n\t"					\
     57	"move\t%0,$0\n"							\
     58	"2:\n\t"							\
     59	".insn\n\t"							\
     60	".section\t.fixup,\"ax\"\n"					\
     61	"3:\tli\t%0,%3\n\t"						\
     62	"move\t%1,$0\n\t"						\
     63	"j\t2b\n\t"							\
     64	".previous\n\t"							\
     65	".section\t__dbe_table,\"a\"\n\t"				\
     66	__PA_ADDR "\t1b, 3b\n\t"					\
     67	".previous"							\
     68	:"=r" (__gu_err), "=r" (__gu_val)				\
     69	:"o" (__mp(__gu_addr)), "i" (-EFAULT));				\
     70}
     71
     72extern void __get_dbe_unknown(void);
     73
     74#define __put_dbe(x, ptr, size)						\
     75({									\
     76	long __pu_err;							\
     77	__typeof__(*(ptr)) __pu_val;					\
     78	long __pu_addr;							\
     79	__pu_val = (x);							\
     80	__pu_addr = (long) (ptr);					\
     81	__asm__("":"=r" (__pu_err));					\
     82	switch (size) {							\
     83	case 1: __put_dbe_asm("sb"); break;				\
     84	case 2: __put_dbe_asm("sh"); break;				\
     85	case 4: __put_dbe_asm("sw"); break;				\
     86	case 8: __put_dbe_asm("sd"); break;				\
     87	default: __put_dbe_unknown(); break;				\
     88	}								\
     89	__pu_err;							\
     90})
     91
     92#define __put_dbe_asm(insn)						\
     93{									\
     94	__asm__ __volatile__(						\
     95	"1:\t" insn "\t%1,%2\n\t"					\
     96	"move\t%0,$0\n"							\
     97	"2:\n\t"							\
     98	".insn\n\t"							\
     99	".section\t.fixup,\"ax\"\n"					\
    100	"3:\tli\t%0,%3\n\t"						\
    101	"j\t2b\n\t"							\
    102	".previous\n\t"							\
    103	".section\t__dbe_table,\"a\"\n\t"				\
    104	__PA_ADDR "\t1b, 3b\n\t"					\
    105	".previous"							\
    106	: "=r" (__pu_err)						\
    107	: "r" (__pu_val), "o" (__mp(__pu_addr)), "i" (-EFAULT));	\
    108}
    109
    110extern void __put_dbe_unknown(void);
    111
    112extern unsigned long search_dbe_table(unsigned long addr);
    113
    114#endif /* _ASM_PACCESS_H */