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77 lines
1.9 KiB
77 lines
1.9 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _ASM_X86_NOPS_H |
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#define _ASM_X86_NOPS_H |
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#include <asm/asm.h> |
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/* |
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* Define nops for use with alternative() and for tracing. |
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*/ |
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#ifndef CONFIG_64BIT |
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/* |
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* Generic 32bit nops from GAS: |
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* |
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* 1: nop |
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* 2: movl %esi,%esi |
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* 3: leal 0x0(%esi),%esi |
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* 4: leal 0x0(%esi,%eiz,1),%esi |
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* 5: leal %ds:0x0(%esi,%eiz,1),%esi |
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* 6: leal 0x0(%esi),%esi |
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* 7: leal 0x0(%esi,%eiz,1),%esi |
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* 8: leal %ds:0x0(%esi,%eiz,1),%esi |
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* |
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* Except 5 and 8, which are DS prefixed 4 and 7 resp, where GAS would emit 2 |
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* nop instructions. |
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*/ |
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#define BYTES_NOP1 0x90 |
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#define BYTES_NOP2 0x89,0xf6 |
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#define BYTES_NOP3 0x8d,0x76,0x00 |
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#define BYTES_NOP4 0x8d,0x74,0x26,0x00 |
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#define BYTES_NOP5 0x3e,BYTES_NOP4 |
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#define BYTES_NOP6 0x8d,0xb6,0x00,0x00,0x00,0x00 |
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#define BYTES_NOP7 0x8d,0xb4,0x26,0x00,0x00,0x00,0x00 |
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#define BYTES_NOP8 0x3e,BYTES_NOP7 |
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#else |
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/* |
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* Generic 64bit nops from GAS: |
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* |
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* 1: nop |
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* 2: osp nop |
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* 3: nopl (%eax) |
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* 4: nopl 0x00(%eax) |
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* 5: nopl 0x00(%eax,%eax,1) |
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* 6: osp nopl 0x00(%eax,%eax,1) |
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* 7: nopl 0x00000000(%eax) |
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* 8: nopl 0x00000000(%eax,%eax,1) |
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*/ |
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#define BYTES_NOP1 0x90 |
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#define BYTES_NOP2 0x66,BYTES_NOP1 |
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#define BYTES_NOP3 0x0f,0x1f,0x00 |
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#define BYTES_NOP4 0x0f,0x1f,0x40,0x00 |
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#define BYTES_NOP5 0x0f,0x1f,0x44,0x00,0x00 |
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#define BYTES_NOP6 0x66,BYTES_NOP5 |
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#define BYTES_NOP7 0x0f,0x1f,0x80,0x00,0x00,0x00,0x00 |
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#define BYTES_NOP8 0x0f,0x1f,0x84,0x00,0x00,0x00,0x00,0x00 |
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#endif /* CONFIG_64BIT */ |
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#define ASM_NOP1 _ASM_BYTES(BYTES_NOP1) |
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#define ASM_NOP2 _ASM_BYTES(BYTES_NOP2) |
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#define ASM_NOP3 _ASM_BYTES(BYTES_NOP3) |
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#define ASM_NOP4 _ASM_BYTES(BYTES_NOP4) |
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#define ASM_NOP5 _ASM_BYTES(BYTES_NOP5) |
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#define ASM_NOP6 _ASM_BYTES(BYTES_NOP6) |
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#define ASM_NOP7 _ASM_BYTES(BYTES_NOP7) |
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#define ASM_NOP8 _ASM_BYTES(BYTES_NOP8) |
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#define ASM_NOP_MAX 8 |
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#ifndef __ASSEMBLY__ |
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extern const unsigned char * const x86_nops[]; |
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#endif |
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#endif /* _ASM_X86_NOPS_H */
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