| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef _ASM_X86_NOPS_H |
| #define _ASM_X86_NOPS_H |
| |
| #include <asm/asm.h> |
| |
| /* |
| * Define nops for use with alternative() and for tracing. |
| */ |
| |
| #ifndef CONFIG_64BIT |
| |
| /* |
| * Generic 32bit nops from GAS: |
| * |
| * 1: nop |
| * 2: movl %esi,%esi |
| * 3: leal 0x0(%esi),%esi |
| * 4: leal 0x0(%esi,%eiz,1),%esi |
| * 5: leal %ds:0x0(%esi,%eiz,1),%esi |
| * 6: leal 0x0(%esi),%esi |
| * 7: leal 0x0(%esi,%eiz,1),%esi |
| * 8: leal %ds:0x0(%esi,%eiz,1),%esi |
| * |
| * Except 5 and 8, which are DS prefixed 4 and 7 resp, where GAS would emit 2 |
| * nop instructions. |
| */ |
| #define BYTES_NOP1 0x90 |
| #define BYTES_NOP2 0x89,0xf6 |
| #define BYTES_NOP3 0x8d,0x76,0x00 |
| #define BYTES_NOP4 0x8d,0x74,0x26,0x00 |
| #define BYTES_NOP5 0x3e,BYTES_NOP4 |
| #define BYTES_NOP6 0x8d,0xb6,0x00,0x00,0x00,0x00 |
| #define BYTES_NOP7 0x8d,0xb4,0x26,0x00,0x00,0x00,0x00 |
| #define BYTES_NOP8 0x3e,BYTES_NOP7 |
| |
| #define ASM_NOP_MAX 8 |
| |
| #else |
| |
| /* |
| * Generic 64bit nops from GAS: |
| * |
| * 1: nop |
| * 2: osp nop |
| * 3: nopl (%eax) |
| * 4: nopl 0x00(%eax) |
| * 5: nopl 0x00(%eax,%eax,1) |
| * 6: osp nopl 0x00(%eax,%eax,1) |
| * 7: nopl 0x00000000(%eax) |
| * 8: nopl 0x00000000(%eax,%eax,1) |
| * 9: cs nopl 0x00000000(%eax,%eax,1) |
| * 10: osp cs nopl 0x00000000(%eax,%eax,1) |
| * 11: osp osp cs nopl 0x00000000(%eax,%eax,1) |
| */ |
| #define BYTES_NOP1 0x90 |
| #define BYTES_NOP2 0x66,BYTES_NOP1 |
| #define BYTES_NOP3 0x0f,0x1f,0x00 |
| #define BYTES_NOP4 0x0f,0x1f,0x40,0x00 |
| #define BYTES_NOP5 0x0f,0x1f,0x44,0x00,0x00 |
| #define BYTES_NOP6 0x66,BYTES_NOP5 |
| #define BYTES_NOP7 0x0f,0x1f,0x80,0x00,0x00,0x00,0x00 |
| #define BYTES_NOP8 0x0f,0x1f,0x84,0x00,0x00,0x00,0x00,0x00 |
| #define BYTES_NOP9 0x2e,BYTES_NOP8 |
| #define BYTES_NOP10 0x66,BYTES_NOP9 |
| #define BYTES_NOP11 0x66,BYTES_NOP10 |
| |
| #define ASM_NOP9 _ASM_BYTES(BYTES_NOP9) |
| #define ASM_NOP10 _ASM_BYTES(BYTES_NOP10) |
| #define ASM_NOP11 _ASM_BYTES(BYTES_NOP11) |
| |
| #define ASM_NOP_MAX 11 |
| |
| #endif /* CONFIG_64BIT */ |
| |
| #define ASM_NOP1 _ASM_BYTES(BYTES_NOP1) |
| #define ASM_NOP2 _ASM_BYTES(BYTES_NOP2) |
| #define ASM_NOP3 _ASM_BYTES(BYTES_NOP3) |
| #define ASM_NOP4 _ASM_BYTES(BYTES_NOP4) |
| #define ASM_NOP5 _ASM_BYTES(BYTES_NOP5) |
| #define ASM_NOP6 _ASM_BYTES(BYTES_NOP6) |
| #define ASM_NOP7 _ASM_BYTES(BYTES_NOP7) |
| #define ASM_NOP8 _ASM_BYTES(BYTES_NOP8) |
| |
| #ifndef __ASSEMBLY__ |
| extern const unsigned char * const x86_nops[]; |
| #endif |
| |
| #endif /* _ASM_X86_NOPS_H */ |
