arch/x86/include/asm/inst.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Generate .byte code for some instructions not supported by old
   4  * binutils.
   5  */
   6 #ifndef X86_ASM_INST_H
   7 #define X86_ASM_INST_H
   8
   9 #ifdef __ASSEMBLY__
  10
  11 #define REG_NUM_INVALID         100
  12
  13 #define REG_TYPE_R32            0
  14 #define REG_TYPE_R64            1
  15 #define REG_TYPE_INVALID        100
  16
  17         .macro R32_NUM opd r32
  18         \opd = REG_NUM_INVALID
  19         .ifc \r32,%eax
  20         \opd = 0
  21         .endif
  22         .ifc \r32,%ecx
  23         \opd = 1
  24         .endif
  25         .ifc \r32,%edx
  26         \opd = 2
  27         .endif
  28         .ifc \r32,%ebx
  29         \opd = 3
  30         .endif
  31         .ifc \r32,%esp
  32         \opd = 4
  33         .endif
  34         .ifc \r32,%ebp
  35         \opd = 5
  36         .endif
  37         .ifc \r32,%esi
  38         \opd = 6
  39         .endif
  40         .ifc \r32,%edi
  41         \opd = 7
  42         .endif
  43 #ifdef CONFIG_X86_64
  44         .ifc \r32,%r8d
  45         \opd = 8
  46         .endif
  47         .ifc \r32,%r9d
  48         \opd = 9
  49         .endif
  50         .ifc \r32,%r10d
  51         \opd = 10
  52         .endif
  53         .ifc \r32,%r11d
  54         \opd = 11
  55         .endif
  56         .ifc \r32,%r12d
  57         \opd = 12
  58         .endif
  59         .ifc \r32,%r13d
  60         \opd = 13
  61         .endif
  62         .ifc \r32,%r14d
  63         \opd = 14
  64         .endif
  65         .ifc \r32,%r15d
  66         \opd = 15
  67         .endif
  68 #endif
  69         .endm
  70
  71         .macro R64_NUM opd r64
  72         \opd = REG_NUM_INVALID
  73 #ifdef CONFIG_X86_64
  74         .ifc \r64,%rax
  75         \opd = 0
  76         .endif
  77         .ifc \r64,%rcx
  78         \opd = 1
  79         .endif
  80         .ifc \r64,%rdx
  81         \opd = 2
  82         .endif
  83         .ifc \r64,%rbx
  84         \opd = 3
  85         .endif
  86         .ifc \r64,%rsp
  87         \opd = 4
  88         .endif
  89         .ifc \r64,%rbp
  90         \opd = 5
  91         .endif
  92         .ifc \r64,%rsi
  93         \opd = 6
  94         .endif
  95         .ifc \r64,%rdi
  96         \opd = 7
  97         .endif
  98         .ifc \r64,%r8
  99         \opd = 8
 100         .endif
 101         .ifc \r64,%r9
 102         \opd = 9
 103         .endif
 104         .ifc \r64,%r10
 105         \opd = 10
 106         .endif
 107         .ifc \r64,%r11
 108         \opd = 11
 109         .endif
 110         .ifc \r64,%r12
 111         \opd = 12
 112         .endif
 113         .ifc \r64,%r13
 114         \opd = 13
 115         .endif
 116         .ifc \r64,%r14
 117         \opd = 14
 118         .endif
 119         .ifc \r64,%r15
 120         \opd = 15
 121         .endif
 122 #endif
 123         .endm
 124
 125         .macro REG_TYPE type reg
 126         R32_NUM reg_type_r32 \reg
 127         R64_NUM reg_type_r64 \reg
 128         .if reg_type_r64 <> REG_NUM_INVALID
 129         \type = REG_TYPE_R64
 130         .elseif reg_type_r32 <> REG_NUM_INVALID
 131         \type = REG_TYPE_R32
 132         .else
 133         \type = REG_TYPE_INVALID
 134         .endif
 135         .endm
 136
 137         .macro PFX_REX opd1 opd2 W=0
 138         .if ((\opd1 | \opd2) & 8) || \W
 139         .byte 0x40 | ((\opd1 & 8) >> 3) | ((\opd2 & 8) >> 1) | (\W << 3)
 140         .endif
 141         .endm
 142
 143         .macro MODRM mod opd1 opd2
 144         .byte \mod | (\opd1 & 7) | ((\opd2 & 7) << 3)
 145         .endm
 146
 147 .macro RDPID opd
 148         REG_TYPE rdpid_opd_type \opd
 149         .if rdpid_opd_type == REG_TYPE_R64
 150         R64_NUM rdpid_opd \opd
 151         .else
 152         R32_NUM rdpid_opd \opd
 153         .endif
 154         .byte 0xf3
 155         .if rdpid_opd > 7
 156         PFX_REX rdpid_opd 0
 157         .endif
 158         .byte 0x0f, 0xc7
 159         MODRM 0xc0 rdpid_opd 0x7
 160 .endm
 161 #endif
 162
 163 #endif