arch/x86/lib/inat.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * x86 instruction attribute tables
   4  *
   5  * Written by Masami Hiramatsu <mhiramat@redhat.com>
   6  */
   7 #include <asm/insn.h>
   8
   9 /* Attribute tables are generated from opcode map */
  10 #include "inat-tables.c"
  11
  12 /* Attribute search APIs */
  13 insn_attr_t inat_get_opcode_attribute(insn_byte_t opcode)
  14 {
  15         return inat_primary_table[opcode];
  16 }
  17
  18 int inat_get_last_prefix_id(insn_byte_t last_pfx)
  19 {
  20         insn_attr_t lpfx_attr;
  21
  22         lpfx_attr = inat_get_opcode_attribute(last_pfx);
  23         return inat_last_prefix_id(lpfx_attr);
  24 }
  25
  26 insn_attr_t inat_get_escape_attribute(insn_byte_t opcode, int lpfx_id,
  27                                       insn_attr_t esc_attr)
  28 {
  29         const insn_attr_t *table;
  30         int n;
  31
  32         n = inat_escape_id(esc_attr);
  33
  34         table = inat_escape_tables[n][0];
  35         if (!table)
  36                 return 0;
  37         if (inat_has_variant(table[opcode]) && lpfx_id) {
  38                 table = inat_escape_tables[n][lpfx_id];
  39                 if (!table)
  40                         return 0;
  41         }
  42         return table[opcode];
  43 }
  44
  45 insn_attr_t inat_get_group_attribute(insn_byte_t modrm, int lpfx_id,
  46                                      insn_attr_t grp_attr)
  47 {
  48         const insn_attr_t *table;
  49         int n;
  50
  51         n = inat_group_id(grp_attr);
  52
  53         table = inat_group_tables[n][0];
  54         if (!table)
  55                 return inat_group_common_attribute(grp_attr);
  56         if (inat_has_variant(table[X86_MODRM_REG(modrm)]) && lpfx_id) {
  57                 table = inat_group_tables[n][lpfx_id];
  58                 if (!table)
  59                         return inat_group_common_attribute(grp_attr);
  60         }
  61         return table[X86_MODRM_REG(modrm)] |
  62                inat_group_common_attribute(grp_attr);
  63 }
  64
  65 insn_attr_t inat_get_avx_attribute(insn_byte_t opcode, insn_byte_t vex_m,
  66                                    insn_byte_t vex_p)
  67 {
  68         const insn_attr_t *table;
  69         if (vex_m > X86_VEX_M_MAX || vex_p > INAT_LSTPFX_MAX)
  70                 return 0;
  71         /* At first, this checks the master table */
  72         table = inat_avx_tables[vex_m][0];
  73         if (!table)
  74                 return 0;
  75         if (!inat_is_group(table[opcode]) && vex_p) {
  76                 /* If this is not a group, get attribute directly */
  77                 table = inat_avx_tables[vex_m][vex_p];
  78                 if (!table)
  79                         return 0;
  80         }
  81         return table[opcode];
  82 }
  83