Edit File: nops.h
#ifndef _ASM_X86_NOPS_H #define _ASM_X86_NOPS_H /* * Define nops for use with alternative() and for tracing. * * *_NOP5_ATOMIC must be a single instruction. */ #define NOP_DS_PREFIX 0x3e /* generic versions from gas 1: nop the following instructions are NOT nops in 64-bit mode, for 64-bit mode use K8 or P6 nops instead 2: movl %esi,%esi 3: leal 0x00(%esi),%esi 4: leal 0x00(,%esi,1),%esi 6: leal 0x00000000(%esi),%esi 7: leal 0x00000000(,%esi,1),%esi */ #define GENERIC_NOP1 0x90 #define GENERIC_NOP2 0x89,0xf6 #define GENERIC_NOP3 0x8d,0x76,0x00 #define GENERIC_NOP4 0x8d,0x74,0x26,0x00 #define GENERIC_NOP5 GENERIC_NOP1,GENERIC_NOP4 #define GENERIC_NOP6 0x8d,0xb6,0x00,0x00,0x00,0x00 #define GENERIC_NOP7 0x8d,0xb4,0x26,0x00,0x00,0x00,0x00 #define GENERIC_NOP8 GENERIC_NOP1,GENERIC_NOP7 #define GENERIC_NOP5_ATOMIC NOP_DS_PREFIX,GENERIC_NOP4 /* Opteron 64bit nops 1: nop 2: osp nop 3: osp osp nop 4: osp osp osp nop */ #define K8_NOP1 GENERIC_NOP1 #define K8_NOP2 0x66,K8_NOP1 #define K8_NOP3 0x66,K8_NOP2 #define K8_NOP4 0x66,K8_NOP3 #define K8_NOP5 K8_NOP3,K8_NOP2 #define K8_NOP6 K8_NOP3,K8_NOP3 #define K8_NOP7 K8_NOP4,K8_NOP3 #define K8_NOP8 K8_NOP4,K8_NOP4 #define K8_NOP5_ATOMIC 0x66,K8_NOP4 /* K7 nops uses eax dependencies (arbitrary choice) 1: nop 2: movl %eax,%eax 3: leal (,%eax,1),%eax 4: leal 0x00(,%eax,1),%eax 6: leal 0x00000000(%eax),%eax 7: leal 0x00000000(,%eax,1),%eax */ #define K7_NOP1 GENERIC_NOP1 #define K7_NOP2 0x8b,0xc0 #define K7_NOP3 0x8d,0x04,0x20 #define K7_NOP4 0x8d,0x44,0x20,0x00 #define K7_NOP5 K7_NOP4,K7_NOP1 #define K7_NOP6 0x8d,0x80,0,0,0,0 #define K7_NOP7 0x8D,0x04,0x05,0,0,0,0 #define K7_NOP8 K7_NOP7,K7_NOP1 #define K7_NOP5_ATOMIC NOP_DS_PREFIX,K7_NOP4 /* P6 nops uses eax dependencies (Intel-recommended choice) 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) Note: All the above are assumed to be a single instruction. There is kernel code that depends on this. */ #define P6_NOP1 GENERIC_NOP1 #define P6_NOP2 0x66,0x90 #define P6_NOP3 0x0f,0x1f,0x00 #define P6_NOP4 0x0f,0x1f,0x40,0 #define P6_NOP5 0x0f,0x1f,0x44,0x00,0 #define P6_NOP6 0x66,0x0f,0x1f,0x44,0x00,0 #define P6_NOP7 0x0f,0x1f,0x80,0,0,0,0 #define P6_NOP8 0x0f,0x1f,0x84,0x00,0,0,0,0 #define P6_NOP5_ATOMIC P6_NOP5 #ifdef __ASSEMBLY__ #define _ASM_MK_NOP(x) .byte x #else #define _ASM_MK_NOP(x) ".byte " __stringify(x) "\n" #endif #if defined(CONFIG_MK7) #define ASM_NOP1 _ASM_MK_NOP(K7_NOP1) #define ASM_NOP2 _ASM_MK_NOP(K7_NOP2) #define ASM_NOP3 _ASM_MK_NOP(K7_NOP3) #define ASM_NOP4 _ASM_MK_NOP(K7_NOP4) #define ASM_NOP5 _ASM_MK_NOP(K7_NOP5) #define ASM_NOP6 _ASM_MK_NOP(K7_NOP6) #define ASM_NOP7 _ASM_MK_NOP(K7_NOP7) #define ASM_NOP8 _ASM_MK_NOP(K7_NOP8) #define ASM_NOP5_ATOMIC _ASM_MK_NOP(K7_NOP5_ATOMIC) #elif defined(CONFIG_X86_P6_NOP) #define ASM_NOP1 _ASM_MK_NOP(P6_NOP1) #define ASM_NOP2 _ASM_MK_NOP(P6_NOP2) #define ASM_NOP3 _ASM_MK_NOP(P6_NOP3) #define ASM_NOP4 _ASM_MK_NOP(P6_NOP4) #define ASM_NOP5 _ASM_MK_NOP(P6_NOP5) #define ASM_NOP6 _ASM_MK_NOP(P6_NOP6) #define ASM_NOP7 _ASM_MK_NOP(P6_NOP7) #define ASM_NOP8 _ASM_MK_NOP(P6_NOP8) #define ASM_NOP5_ATOMIC _ASM_MK_NOP(P6_NOP5_ATOMIC) #elif defined(CONFIG_X86_64) #define ASM_NOP1 _ASM_MK_NOP(K8_NOP1) #define ASM_NOP2 _ASM_MK_NOP(K8_NOP2) #define ASM_NOP3 _ASM_MK_NOP(K8_NOP3) #define ASM_NOP4 _ASM_MK_NOP(K8_NOP4) #define ASM_NOP5 _ASM_MK_NOP(K8_NOP5) #define ASM_NOP6 _ASM_MK_NOP(K8_NOP6) #define ASM_NOP7 _ASM_MK_NOP(K8_NOP7) #define ASM_NOP8 _ASM_MK_NOP(K8_NOP8) #define ASM_NOP5_ATOMIC _ASM_MK_NOP(K8_NOP5_ATOMIC) #else #define ASM_NOP1 _ASM_MK_NOP(GENERIC_NOP1) #define ASM_NOP2 _ASM_MK_NOP(GENERIC_NOP2) #define ASM_NOP3 _ASM_MK_NOP(GENERIC_NOP3) #define ASM_NOP4 _ASM_MK_NOP(GENERIC_NOP4) #define ASM_NOP5 _ASM_MK_NOP(GENERIC_NOP5) #define ASM_NOP6 _ASM_MK_NOP(GENERIC_NOP6) #define ASM_NOP7 _ASM_MK_NOP(GENERIC_NOP7) #define ASM_NOP8 _ASM_MK_NOP(GENERIC_NOP8) #define ASM_NOP5_ATOMIC _ASM_MK_NOP(GENERIC_NOP5_ATOMIC) #endif #define ASM_NOP_MAX 8 #define NOP_ATOMIC5 (ASM_NOP_MAX+1) /* Entry for the 5-byte atomic NOP */ #ifndef __ASSEMBLY__ extern const unsigned char * const *ideal_nops; extern void arch_init_ideal_nops(void); #endif #endif /* _ASM_X86_NOPS_H */