cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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nops.h (1905B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef _ASM_X86_NOPS_H
      3#define _ASM_X86_NOPS_H
      4
      5#include <asm/asm.h>
      6
      7/*
      8 * Define nops for use with alternative() and for tracing.
      9 */
     10
     11#ifndef CONFIG_64BIT
     12
     13/*
     14 * Generic 32bit nops from GAS:
     15 *
     16 * 1: nop
     17 * 2: movl %esi,%esi
     18 * 3: leal 0x0(%esi),%esi
     19 * 4: leal 0x0(%esi,%eiz,1),%esi
     20 * 5: leal %ds:0x0(%esi,%eiz,1),%esi
     21 * 6: leal 0x0(%esi),%esi
     22 * 7: leal 0x0(%esi,%eiz,1),%esi
     23 * 8: leal %ds:0x0(%esi,%eiz,1),%esi
     24 *
     25 * Except 5 and 8, which are DS prefixed 4 and 7 resp, where GAS would emit 2
     26 * nop instructions.
     27 */
     28#define BYTES_NOP1	0x90
     29#define BYTES_NOP2	0x89,0xf6
     30#define BYTES_NOP3	0x8d,0x76,0x00
     31#define BYTES_NOP4	0x8d,0x74,0x26,0x00
     32#define BYTES_NOP5	0x3e,BYTES_NOP4
     33#define BYTES_NOP6	0x8d,0xb6,0x00,0x00,0x00,0x00
     34#define BYTES_NOP7	0x8d,0xb4,0x26,0x00,0x00,0x00,0x00
     35#define BYTES_NOP8	0x3e,BYTES_NOP7
     36
     37#else
     38
     39/*
     40 * Generic 64bit nops from GAS:
     41 *
     42 * 1: nop
     43 * 2: osp nop
     44 * 3: nopl (%eax)
     45 * 4: nopl 0x00(%eax)
     46 * 5: nopl 0x00(%eax,%eax,1)
     47 * 6: osp nopl 0x00(%eax,%eax,1)
     48 * 7: nopl 0x00000000(%eax)
     49 * 8: nopl 0x00000000(%eax,%eax,1)
     50 */
     51#define BYTES_NOP1	0x90
     52#define BYTES_NOP2	0x66,BYTES_NOP1
     53#define BYTES_NOP3	0x0f,0x1f,0x00
     54#define BYTES_NOP4	0x0f,0x1f,0x40,0x00
     55#define BYTES_NOP5	0x0f,0x1f,0x44,0x00,0x00
     56#define BYTES_NOP6	0x66,BYTES_NOP5
     57#define BYTES_NOP7	0x0f,0x1f,0x80,0x00,0x00,0x00,0x00
     58#define BYTES_NOP8	0x0f,0x1f,0x84,0x00,0x00,0x00,0x00,0x00
     59
     60#endif /* CONFIG_64BIT */
     61
     62#define ASM_NOP1 _ASM_BYTES(BYTES_NOP1)
     63#define ASM_NOP2 _ASM_BYTES(BYTES_NOP2)
     64#define ASM_NOP3 _ASM_BYTES(BYTES_NOP3)
     65#define ASM_NOP4 _ASM_BYTES(BYTES_NOP4)
     66#define ASM_NOP5 _ASM_BYTES(BYTES_NOP5)
     67#define ASM_NOP6 _ASM_BYTES(BYTES_NOP6)
     68#define ASM_NOP7 _ASM_BYTES(BYTES_NOP7)
     69#define ASM_NOP8 _ASM_BYTES(BYTES_NOP8)
     70
     71#define ASM_NOP_MAX 8
     72
     73#ifndef __ASSEMBLY__
     74extern const unsigned char * const x86_nops[];
     75#endif
     76
     77#endif /* _ASM_X86_NOPS_H */