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1 #ifndef _ASM_X86_NOPS_H |
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2 #define _ASM_X86_NOPS_H |
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3 |
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4 /* Define nops for use with alternative() */ |
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5 |
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6 /* generic versions from gas |
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7 1: nop |
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8 the following instructions are NOT nops in 64-bit mode, |
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9 for 64-bit mode use K8 or P6 nops instead |
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10 2: movl %esi,%esi |
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11 3: leal 0x00(%esi),%esi |
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12 4: leal 0x00(,%esi,1),%esi |
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13 6: leal 0x00000000(%esi),%esi |
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14 7: leal 0x00000000(,%esi,1),%esi |
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15 */ |
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16 #define GENERIC_NOP1 ".byte 0x90\n" |
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17 #define GENERIC_NOP2 ".byte 0x89,0xf6\n" |
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18 #define GENERIC_NOP3 ".byte 0x8d,0x76,0x00\n" |
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19 #define GENERIC_NOP4 ".byte 0x8d,0x74,0x26,0x00\n" |
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20 #define GENERIC_NOP5 GENERIC_NOP1 GENERIC_NOP4 |
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21 #define GENERIC_NOP6 ".byte 0x8d,0xb6,0x00,0x00,0x00,0x00\n" |
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22 #define GENERIC_NOP7 ".byte 0x8d,0xb4,0x26,0x00,0x00,0x00,0x00\n" |
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23 #define GENERIC_NOP8 GENERIC_NOP1 GENERIC_NOP7 |
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24 |
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25 /* Opteron 64bit nops |
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26 1: nop |
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27 2: osp nop |
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28 3: osp osp nop |
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29 4: osp osp osp nop |
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30 */ |
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31 #define K8_NOP1 GENERIC_NOP1 |
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32 #define K8_NOP2 ".byte 0x66,0x90\n" |
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33 #define K8_NOP3 ".byte 0x66,0x66,0x90\n" |
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34 #define K8_NOP4 ".byte 0x66,0x66,0x66,0x90\n" |
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35 #define K8_NOP5 K8_NOP3 K8_NOP2 |
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36 #define K8_NOP6 K8_NOP3 K8_NOP3 |
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37 #define K8_NOP7 K8_NOP4 K8_NOP3 |
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38 #define K8_NOP8 K8_NOP4 K8_NOP4 |
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39 |
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40 /* K7 nops |
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41 uses eax dependencies (arbitary choice) |
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42 1: nop |
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43 2: movl %eax,%eax |
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44 3: leal (,%eax,1),%eax |
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45 4: leal 0x00(,%eax,1),%eax |
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46 6: leal 0x00000000(%eax),%eax |
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47 7: leal 0x00000000(,%eax,1),%eax |
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48 */ |
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49 #define K7_NOP1 GENERIC_NOP1 |
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50 #define K7_NOP2 ".byte 0x8b,0xc0\n" |
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51 #define K7_NOP3 ".byte 0x8d,0x04,0x20\n" |
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52 #define K7_NOP4 ".byte 0x8d,0x44,0x20,0x00\n" |
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53 #define K7_NOP5 K7_NOP4 ASM_NOP1 |
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54 #define K7_NOP6 ".byte 0x8d,0x80,0,0,0,0\n" |
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55 #define K7_NOP7 ".byte 0x8D,0x04,0x05,0,0,0,0\n" |
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56 #define K7_NOP8 K7_NOP7 ASM_NOP1 |
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57 |
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58 /* P6 nops |
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59 uses eax dependencies (Intel-recommended choice) |
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60 1: nop |
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61 2: osp nop |
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62 3: nopl (%eax) |
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63 4: nopl 0x00(%eax) |
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64 5: nopl 0x00(%eax,%eax,1) |
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65 6: osp nopl 0x00(%eax,%eax,1) |
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66 7: nopl 0x00000000(%eax) |
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67 8: nopl 0x00000000(%eax,%eax,1) |
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68 */ |
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69 #define P6_NOP1 GENERIC_NOP1 |
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70 #define P6_NOP2 ".byte 0x66,0x90\n" |
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71 #define P6_NOP3 ".byte 0x0f,0x1f,0x00\n" |
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72 #define P6_NOP4 ".byte 0x0f,0x1f,0x40,0\n" |
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73 #define P6_NOP5 ".byte 0x0f,0x1f,0x44,0x00,0\n" |
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74 #define P6_NOP6 ".byte 0x66,0x0f,0x1f,0x44,0x00,0\n" |
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75 #define P6_NOP7 ".byte 0x0f,0x1f,0x80,0,0,0,0\n" |
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76 #define P6_NOP8 ".byte 0x0f,0x1f,0x84,0x00,0,0,0,0\n" |
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77 |
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78 #if defined(CONFIG_MK7) |
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79 #define ASM_NOP1 K7_NOP1 |
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80 #define ASM_NOP2 K7_NOP2 |
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81 #define ASM_NOP3 K7_NOP3 |
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82 #define ASM_NOP4 K7_NOP4 |
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83 #define ASM_NOP5 K7_NOP5 |
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84 #define ASM_NOP6 K7_NOP6 |
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85 #define ASM_NOP7 K7_NOP7 |
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86 #define ASM_NOP8 K7_NOP8 |
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87 #elif defined(CONFIG_X86_P6_NOP) |
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88 #define ASM_NOP1 P6_NOP1 |
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89 #define ASM_NOP2 P6_NOP2 |
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90 #define ASM_NOP3 P6_NOP3 |
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91 #define ASM_NOP4 P6_NOP4 |
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92 #define ASM_NOP5 P6_NOP5 |
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93 #define ASM_NOP6 P6_NOP6 |
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94 #define ASM_NOP7 P6_NOP7 |
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95 #define ASM_NOP8 P6_NOP8 |
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96 #elif defined(CONFIG_X86_64) |
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97 #define ASM_NOP1 K8_NOP1 |
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98 #define ASM_NOP2 K8_NOP2 |
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99 #define ASM_NOP3 K8_NOP3 |
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100 #define ASM_NOP4 K8_NOP4 |
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101 #define ASM_NOP5 K8_NOP5 |
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102 #define ASM_NOP6 K8_NOP6 |
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103 #define ASM_NOP7 K8_NOP7 |
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104 #define ASM_NOP8 K8_NOP8 |
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105 #else |
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106 #define ASM_NOP1 GENERIC_NOP1 |
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107 #define ASM_NOP2 GENERIC_NOP2 |
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108 #define ASM_NOP3 GENERIC_NOP3 |
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109 #define ASM_NOP4 GENERIC_NOP4 |
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110 #define ASM_NOP5 GENERIC_NOP5 |
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111 #define ASM_NOP6 GENERIC_NOP6 |
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112 #define ASM_NOP7 GENERIC_NOP7 |
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113 #define ASM_NOP8 GENERIC_NOP8 |
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114 #endif |
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115 |
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116 #define ASM_NOP_MAX 8 |
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117 |
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118 #endif /* _ASM_X86_NOPS_H */ |