| #ifndef _ASM_X86_NOPS_H |
| #define _ASM_X86_NOPS_H |
| |
| /* Define nops for use with alternative() */ |
| |
| /* 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 ".byte 0x90\n" |
| #define GENERIC_NOP2 ".byte 0x89,0xf6\n" |
| #define GENERIC_NOP3 ".byte 0x8d,0x76,0x00\n" |
| #define GENERIC_NOP4 ".byte 0x8d,0x74,0x26,0x00\n" |
| #define GENERIC_NOP5 GENERIC_NOP1 GENERIC_NOP4 |
| #define GENERIC_NOP6 ".byte 0x8d,0xb6,0x00,0x00,0x00,0x00\n" |
| #define GENERIC_NOP7 ".byte 0x8d,0xb4,0x26,0x00,0x00,0x00,0x00\n" |
| #define GENERIC_NOP8 GENERIC_NOP1 GENERIC_NOP7 |
| |
| /* 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 ".byte 0x66,0x90\n" |
| #define K8_NOP3 ".byte 0x66,0x66,0x90\n" |
| #define K8_NOP4 ".byte 0x66,0x66,0x66,0x90\n" |
| #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 |
| |
| /* K7 nops |
| uses eax dependencies (arbitary 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 ".byte 0x8b,0xc0\n" |
| #define K7_NOP3 ".byte 0x8d,0x04,0x20\n" |
| #define K7_NOP4 ".byte 0x8d,0x44,0x20,0x00\n" |
| #define K7_NOP5 K7_NOP4 ASM_NOP1 |
| #define K7_NOP6 ".byte 0x8d,0x80,0,0,0,0\n" |
| #define K7_NOP7 ".byte 0x8D,0x04,0x05,0,0,0,0\n" |
| #define K7_NOP8 K7_NOP7 ASM_NOP1 |
| |
| /* 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 ".byte 0x66,0x90\n" |
| #define P6_NOP3 ".byte 0x0f,0x1f,0x00\n" |
| #define P6_NOP4 ".byte 0x0f,0x1f,0x40,0\n" |
| #define P6_NOP5 ".byte 0x0f,0x1f,0x44,0x00,0\n" |
| #define P6_NOP6 ".byte 0x66,0x0f,0x1f,0x44,0x00,0\n" |
| #define P6_NOP7 ".byte 0x0f,0x1f,0x80,0,0,0,0\n" |
| #define P6_NOP8 ".byte 0x0f,0x1f,0x84,0x00,0,0,0,0\n" |
| |
| #if defined(CONFIG_MK7) |
| #define ASM_NOP1 K7_NOP1 |
| #define ASM_NOP2 K7_NOP2 |
| #define ASM_NOP3 K7_NOP3 |
| #define ASM_NOP4 K7_NOP4 |
| #define ASM_NOP5 K7_NOP5 |
| #define ASM_NOP6 K7_NOP6 |
| #define ASM_NOP7 K7_NOP7 |
| #define ASM_NOP8 K7_NOP8 |
| #elif defined(CONFIG_X86_P6_NOP) |
| #define ASM_NOP1 P6_NOP1 |
| #define ASM_NOP2 P6_NOP2 |
| #define ASM_NOP3 P6_NOP3 |
| #define ASM_NOP4 P6_NOP4 |
| #define ASM_NOP5 P6_NOP5 |
| #define ASM_NOP6 P6_NOP6 |
| #define ASM_NOP7 P6_NOP7 |
| #define ASM_NOP8 P6_NOP8 |
| #elif defined(CONFIG_X86_64) |
| #define ASM_NOP1 K8_NOP1 |
| #define ASM_NOP2 K8_NOP2 |
| #define ASM_NOP3 K8_NOP3 |
| #define ASM_NOP4 K8_NOP4 |
| #define ASM_NOP5 K8_NOP5 |
| #define ASM_NOP6 K8_NOP6 |
| #define ASM_NOP7 K8_NOP7 |
| #define ASM_NOP8 K8_NOP8 |
| #else |
| #define ASM_NOP1 GENERIC_NOP1 |
| #define ASM_NOP2 GENERIC_NOP2 |
| #define ASM_NOP3 GENERIC_NOP3 |
| #define ASM_NOP4 GENERIC_NOP4 |
| #define ASM_NOP5 GENERIC_NOP5 |
| #define ASM_NOP6 GENERIC_NOP6 |
| #define ASM_NOP7 GENERIC_NOP7 |
| #define ASM_NOP8 GENERIC_NOP8 |
| #endif |
| |
| #define ASM_NOP_MAX 8 |
| |
| #endif /* _ASM_X86_NOPS_H */ |
