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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 */