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Linux kernel mirror (for testing)
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linux
1#ifndef _ASM_NOPS_H
2#define _ASM_NOPS_H 1
3
4/* Define nops for use with alternative() */
5
6/* generic versions from gas */
7#define GENERIC_NOP1 ".byte 0x90\n"
8#define GENERIC_NOP2 ".byte 0x89,0xf6\n"
9#define GENERIC_NOP3 ".byte 0x8d,0x76,0x00\n"
10#define GENERIC_NOP4 ".byte 0x8d,0x74,0x26,0x00\n"
11#define GENERIC_NOP5 GENERIC_NOP1 GENERIC_NOP4
12#define GENERIC_NOP6 ".byte 0x8d,0xb6,0x00,0x00,0x00,0x00\n"
13#define GENERIC_NOP7 ".byte 0x8d,0xb4,0x26,0x00,0x00,0x00,0x00\n"
14#define GENERIC_NOP8 GENERIC_NOP1 GENERIC_NOP7
15
16/* Opteron 64bit nops */
17#define K8_NOP1 GENERIC_NOP1
18#define K8_NOP2 ".byte 0x66,0x90\n"
19#define K8_NOP3 ".byte 0x66,0x66,0x90\n"
20#define K8_NOP4 ".byte 0x66,0x66,0x66,0x90\n"
21#define K8_NOP5 K8_NOP3 K8_NOP2
22#define K8_NOP6 K8_NOP3 K8_NOP3
23#define K8_NOP7 K8_NOP4 K8_NOP3
24#define K8_NOP8 K8_NOP4 K8_NOP4
25
26/* K7 nops */
27/* uses eax dependencies (arbitary choice) */
28#define K7_NOP1 GENERIC_NOP1
29#define K7_NOP2 ".byte 0x8b,0xc0\n"
30#define K7_NOP3 ".byte 0x8d,0x04,0x20\n"
31#define K7_NOP4 ".byte 0x8d,0x44,0x20,0x00\n"
32#define K7_NOP5 K7_NOP4 ASM_NOP1
33#define K7_NOP6 ".byte 0x8d,0x80,0,0,0,0\n"
34#define K7_NOP7 ".byte 0x8D,0x04,0x05,0,0,0,0\n"
35#define K7_NOP8 K7_NOP7 ASM_NOP1
36
37/* P6 nops */
38/* uses eax dependencies (Intel-recommended choice) */
39#define P6_NOP1 GENERIC_NOP1
40#define P6_NOP2 ".byte 0x66,0x90\n"
41#define P6_NOP3 ".byte 0x0f,0x1f,0x00\n"
42#define P6_NOP4 ".byte 0x0f,0x1f,0x40,0\n"
43#define P6_NOP5 ".byte 0x0f,0x1f,0x44,0x00,0\n"
44#define P6_NOP6 ".byte 0x66,0x0f,0x1f,0x44,0x00,0\n"
45#define P6_NOP7 ".byte 0x0f,0x1f,0x80,0,0,0,0\n"
46#define P6_NOP8 ".byte 0x0f,0x1f,0x84,0x00,0,0,0,0\n"
47
48#if defined(CONFIG_MK8)
49#define ASM_NOP1 K8_NOP1
50#define ASM_NOP2 K8_NOP2
51#define ASM_NOP3 K8_NOP3
52#define ASM_NOP4 K8_NOP4
53#define ASM_NOP5 K8_NOP5
54#define ASM_NOP6 K8_NOP6
55#define ASM_NOP7 K8_NOP7
56#define ASM_NOP8 K8_NOP8
57#elif defined(CONFIG_MK7)
58#define ASM_NOP1 K7_NOP1
59#define ASM_NOP2 K7_NOP2
60#define ASM_NOP3 K7_NOP3
61#define ASM_NOP4 K7_NOP4
62#define ASM_NOP5 K7_NOP5
63#define ASM_NOP6 K7_NOP6
64#define ASM_NOP7 K7_NOP7
65#define ASM_NOP8 K7_NOP8
66#elif defined(CONFIG_M686) || defined(CONFIG_MPENTIUMII) || \
67 defined(CONFIG_MPENTIUMIII) || defined(CONFIG_MPENTIUMM) || \
68 defined(CONFIG_MCORE2) || defined(CONFIG_PENTIUM4)
69#define ASM_NOP1 P6_NOP1
70#define ASM_NOP2 P6_NOP2
71#define ASM_NOP3 P6_NOP3
72#define ASM_NOP4 P6_NOP4
73#define ASM_NOP5 P6_NOP5
74#define ASM_NOP6 P6_NOP6
75#define ASM_NOP7 P6_NOP7
76#define ASM_NOP8 P6_NOP8
77#else
78#define ASM_NOP1 GENERIC_NOP1
79#define ASM_NOP2 GENERIC_NOP2
80#define ASM_NOP3 GENERIC_NOP3
81#define ASM_NOP4 GENERIC_NOP4
82#define ASM_NOP5 GENERIC_NOP5
83#define ASM_NOP6 GENERIC_NOP6
84#define ASM_NOP7 GENERIC_NOP7
85#define ASM_NOP8 GENERIC_NOP8
86#endif
87
88#define ASM_NOP_MAX 8
89
90#endif