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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 | #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 #define _ASM_MK_NOP(x) ".byte " __stringify(x) "\n" #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 */ |