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- /* 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
- #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)
- */
- #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
- #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)
- #define ASM_NOP_MAX 8
- #ifndef __ASSEMBLY__
- extern const unsigned char * const x86_nops[];
- #endif
- #endif /* _ASM_X86_NOPS_H */
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