162306a36Sopenharmony_ci/* SPDX-License-Identifier: GPL-2.0 */ 262306a36Sopenharmony_ci#ifndef _ASM_X86_NOPS_H 362306a36Sopenharmony_ci#define _ASM_X86_NOPS_H 462306a36Sopenharmony_ci 562306a36Sopenharmony_ci#include <asm/asm.h> 662306a36Sopenharmony_ci 762306a36Sopenharmony_ci/* 862306a36Sopenharmony_ci * Define nops for use with alternative() and for tracing. 962306a36Sopenharmony_ci */ 1062306a36Sopenharmony_ci 1162306a36Sopenharmony_ci#ifndef CONFIG_64BIT 1262306a36Sopenharmony_ci 1362306a36Sopenharmony_ci/* 1462306a36Sopenharmony_ci * Generic 32bit nops from GAS: 1562306a36Sopenharmony_ci * 1662306a36Sopenharmony_ci * 1: nop 1762306a36Sopenharmony_ci * 2: movl %esi,%esi 1862306a36Sopenharmony_ci * 3: leal 0x0(%esi),%esi 1962306a36Sopenharmony_ci * 4: leal 0x0(%esi,%eiz,1),%esi 2062306a36Sopenharmony_ci * 5: leal %ds:0x0(%esi,%eiz,1),%esi 2162306a36Sopenharmony_ci * 6: leal 0x0(%esi),%esi 2262306a36Sopenharmony_ci * 7: leal 0x0(%esi,%eiz,1),%esi 2362306a36Sopenharmony_ci * 8: leal %ds:0x0(%esi,%eiz,1),%esi 2462306a36Sopenharmony_ci * 2562306a36Sopenharmony_ci * Except 5 and 8, which are DS prefixed 4 and 7 resp, where GAS would emit 2 2662306a36Sopenharmony_ci * nop instructions. 2762306a36Sopenharmony_ci */ 2862306a36Sopenharmony_ci#define BYTES_NOP1 0x90 2962306a36Sopenharmony_ci#define BYTES_NOP2 0x89,0xf6 3062306a36Sopenharmony_ci#define BYTES_NOP3 0x8d,0x76,0x00 3162306a36Sopenharmony_ci#define BYTES_NOP4 0x8d,0x74,0x26,0x00 3262306a36Sopenharmony_ci#define BYTES_NOP5 0x3e,BYTES_NOP4 3362306a36Sopenharmony_ci#define BYTES_NOP6 0x8d,0xb6,0x00,0x00,0x00,0x00 3462306a36Sopenharmony_ci#define BYTES_NOP7 0x8d,0xb4,0x26,0x00,0x00,0x00,0x00 3562306a36Sopenharmony_ci#define BYTES_NOP8 0x3e,BYTES_NOP7 3662306a36Sopenharmony_ci 3762306a36Sopenharmony_ci#define ASM_NOP_MAX 8 3862306a36Sopenharmony_ci 3962306a36Sopenharmony_ci#else 4062306a36Sopenharmony_ci 4162306a36Sopenharmony_ci/* 4262306a36Sopenharmony_ci * Generic 64bit nops from GAS: 4362306a36Sopenharmony_ci * 4462306a36Sopenharmony_ci * 1: nop 4562306a36Sopenharmony_ci * 2: osp nop 4662306a36Sopenharmony_ci * 3: nopl (%eax) 4762306a36Sopenharmony_ci * 4: nopl 0x00(%eax) 4862306a36Sopenharmony_ci * 5: nopl 0x00(%eax,%eax,1) 4962306a36Sopenharmony_ci * 6: osp nopl 0x00(%eax,%eax,1) 5062306a36Sopenharmony_ci * 7: nopl 0x00000000(%eax) 5162306a36Sopenharmony_ci * 8: nopl 0x00000000(%eax,%eax,1) 5262306a36Sopenharmony_ci * 9: cs nopl 0x00000000(%eax,%eax,1) 5362306a36Sopenharmony_ci * 10: osp cs nopl 0x00000000(%eax,%eax,1) 5462306a36Sopenharmony_ci * 11: osp osp cs nopl 0x00000000(%eax,%eax,1) 5562306a36Sopenharmony_ci */ 5662306a36Sopenharmony_ci#define BYTES_NOP1 0x90 5762306a36Sopenharmony_ci#define BYTES_NOP2 0x66,BYTES_NOP1 5862306a36Sopenharmony_ci#define BYTES_NOP3 0x0f,0x1f,0x00 5962306a36Sopenharmony_ci#define BYTES_NOP4 0x0f,0x1f,0x40,0x00 6062306a36Sopenharmony_ci#define BYTES_NOP5 0x0f,0x1f,0x44,0x00,0x00 6162306a36Sopenharmony_ci#define BYTES_NOP6 0x66,BYTES_NOP5 6262306a36Sopenharmony_ci#define BYTES_NOP7 0x0f,0x1f,0x80,0x00,0x00,0x00,0x00 6362306a36Sopenharmony_ci#define BYTES_NOP8 0x0f,0x1f,0x84,0x00,0x00,0x00,0x00,0x00 6462306a36Sopenharmony_ci#define BYTES_NOP9 0x2e,BYTES_NOP8 6562306a36Sopenharmony_ci#define BYTES_NOP10 0x66,BYTES_NOP9 6662306a36Sopenharmony_ci#define BYTES_NOP11 0x66,BYTES_NOP10 6762306a36Sopenharmony_ci 6862306a36Sopenharmony_ci#define ASM_NOP9 _ASM_BYTES(BYTES_NOP9) 6962306a36Sopenharmony_ci#define ASM_NOP10 _ASM_BYTES(BYTES_NOP10) 7062306a36Sopenharmony_ci#define ASM_NOP11 _ASM_BYTES(BYTES_NOP11) 7162306a36Sopenharmony_ci 7262306a36Sopenharmony_ci#define ASM_NOP_MAX 11 7362306a36Sopenharmony_ci 7462306a36Sopenharmony_ci#endif /* CONFIG_64BIT */ 7562306a36Sopenharmony_ci 7662306a36Sopenharmony_ci#define ASM_NOP1 _ASM_BYTES(BYTES_NOP1) 7762306a36Sopenharmony_ci#define ASM_NOP2 _ASM_BYTES(BYTES_NOP2) 7862306a36Sopenharmony_ci#define ASM_NOP3 _ASM_BYTES(BYTES_NOP3) 7962306a36Sopenharmony_ci#define ASM_NOP4 _ASM_BYTES(BYTES_NOP4) 8062306a36Sopenharmony_ci#define ASM_NOP5 _ASM_BYTES(BYTES_NOP5) 8162306a36Sopenharmony_ci#define ASM_NOP6 _ASM_BYTES(BYTES_NOP6) 8262306a36Sopenharmony_ci#define ASM_NOP7 _ASM_BYTES(BYTES_NOP7) 8362306a36Sopenharmony_ci#define ASM_NOP8 _ASM_BYTES(BYTES_NOP8) 8462306a36Sopenharmony_ci 8562306a36Sopenharmony_ci#ifndef __ASSEMBLY__ 8662306a36Sopenharmony_ciextern const unsigned char * const x86_nops[]; 8762306a36Sopenharmony_ci#endif 8862306a36Sopenharmony_ci 8962306a36Sopenharmony_ci#endif /* _ASM_X86_NOPS_H */ 90