forked from Minki/linux
eef23e72b7
Use the new generalized _ASM_BYTES() macro from <asm/asm.h> instead of the "home grown" _ASM_MK_NOP() in <asm/nops.h>. Add <asm/asm.h> and update <asm/nops.h> in the tools directory... Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lore.kernel.org/r/20210510090940.924953-4-hpa@zytor.com
78 lines
1.9 KiB
C
78 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _ASM_X86_NOPS_H
|
|
#define _ASM_X86_NOPS_H
|
|
|
|
#include <asm/asm.h>
|
|
|
|
/*
|
|
* Define nops for use with alternative() and for tracing.
|
|
*/
|
|
|
|
#ifndef CONFIG_64BIT
|
|
|
|
/*
|
|
* Generic 32bit nops from GAS:
|
|
*
|
|
* 1: nop
|
|
* 2: movl %esi,%esi
|
|
* 3: leal 0x0(%esi),%esi
|
|
* 4: leal 0x0(%esi,%eiz,1),%esi
|
|
* 5: leal %ds:0x0(%esi,%eiz,1),%esi
|
|
* 6: leal 0x0(%esi),%esi
|
|
* 7: leal 0x0(%esi,%eiz,1),%esi
|
|
* 8: leal %ds:0x0(%esi,%eiz,1),%esi
|
|
*
|
|
* Except 5 and 8, which are DS prefixed 4 and 7 resp, where GAS would emit 2
|
|
* nop instructions.
|
|
*/
|
|
#define BYTES_NOP1 0x90
|
|
#define BYTES_NOP2 0x89,0xf6
|
|
#define BYTES_NOP3 0x8d,0x76,0x00
|
|
#define BYTES_NOP4 0x8d,0x74,0x26,0x00
|
|
#define BYTES_NOP5 0x3e,BYTES_NOP4
|
|
#define BYTES_NOP6 0x8d,0xb6,0x00,0x00,0x00,0x00
|
|
#define BYTES_NOP7 0x8d,0xb4,0x26,0x00,0x00,0x00,0x00
|
|
#define BYTES_NOP8 0x3e,BYTES_NOP7
|
|
|
|
#else
|
|
|
|
/*
|
|
* Generic 64bit nops from GAS:
|
|
*
|
|
* 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)
|
|
*/
|
|
#define BYTES_NOP1 0x90
|
|
#define BYTES_NOP2 0x66,BYTES_NOP1
|
|
#define BYTES_NOP3 0x0f,0x1f,0x00
|
|
#define BYTES_NOP4 0x0f,0x1f,0x40,0x00
|
|
#define BYTES_NOP5 0x0f,0x1f,0x44,0x00,0x00
|
|
#define BYTES_NOP6 0x66,BYTES_NOP5
|
|
#define BYTES_NOP7 0x0f,0x1f,0x80,0x00,0x00,0x00,0x00
|
|
#define BYTES_NOP8 0x0f,0x1f,0x84,0x00,0x00,0x00,0x00,0x00
|
|
|
|
#endif /* CONFIG_64BIT */
|
|
|
|
#define ASM_NOP1 _ASM_BYTES(BYTES_NOP1)
|
|
#define ASM_NOP2 _ASM_BYTES(BYTES_NOP2)
|
|
#define ASM_NOP3 _ASM_BYTES(BYTES_NOP3)
|
|
#define ASM_NOP4 _ASM_BYTES(BYTES_NOP4)
|
|
#define ASM_NOP5 _ASM_BYTES(BYTES_NOP5)
|
|
#define ASM_NOP6 _ASM_BYTES(BYTES_NOP6)
|
|
#define ASM_NOP7 _ASM_BYTES(BYTES_NOP7)
|
|
#define ASM_NOP8 _ASM_BYTES(BYTES_NOP8)
|
|
|
|
#define ASM_NOP_MAX 8
|
|
|
|
#ifndef __ASSEMBLY__
|
|
extern const unsigned char * const x86_nops[];
|
|
#endif
|
|
|
|
#endif /* _ASM_X86_NOPS_H */
|