1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  * Copyright 2019 Joyent, Inc.
  25  */
  26 
  27 #ifndef _SYS_ASM_MISC_H
  28 #define _SYS_ASM_MISC_H
  29 
  30 #ifdef  __cplusplus
  31 extern "C" {
  32 #endif
  33 
  34 #define RET_INSTR       0xc3
  35 #define NOP_INSTR       0x90
  36 #define STI_INSTR       0xfb
  37 #define JMP_INSTR       0x00eb
  38 
  39 #ifdef _ASM     /* The remainder of this file is only for assembly files */
  40 
  41 /* Load reg with pointer to per-CPU structure */
  42 #if defined(__amd64)
  43 #define LOADCPU(reg)                    \
  44         movq    %gs:CPU_SELF, reg;
  45 #else
  46 #define LOADCPU(reg)                    \
  47         movl    %gs:CPU_SELF, reg;
  48 #endif
  49 
  50 #if defined(__i386)
  51 
  52 #define _HOT_PATCH_PROLOG                       \
  53         push    %ebp;                           \
  54         mov     %esp, %ebp;                     \
  55         push    %ebx;                           \
  56         push    %esi;                           \
  57         push    %edi
  58 
  59 #define _HOT_PATCH(srcaddr, dstaddr, size)      \
  60         movl    $srcaddr, %esi;                 \
  61         movl    $dstaddr, %edi;                 \
  62         movl    $size, %ebx;                    \
  63 0:      pushl   $1;                             \
  64         /*CSTYLED*/                             \
  65         movzbl  (%esi), %eax;                   \
  66         pushl   %eax;                           \
  67         pushl   %edi;                           \
  68         call    hot_patch_kernel_text;          \
  69         addl    $12, %esp;                      \
  70         inc     %edi;                           \
  71         inc     %esi;                           \
  72         dec     %ebx;                           \
  73         test    %ebx, %ebx;                     \
  74         jne     0b
  75 
  76 #define _HOT_PATCH_EPILOG                       \
  77         pop     %edi;                           \
  78         pop     %esi;                           \
  79         pop     %ebx;                           \
  80         mov     %ebp, %esp;                     \
  81         pop     %ebp
  82 
  83 #endif  /* __i386 */
  84 
  85 #endif /* _ASM */
  86 
  87 #ifdef  __cplusplus
  88 }
  89 #endif
  90 
  91 #endif  /* _SYS_ASM_MISC_H */