gdbsupport/x86-xstate.h

   1 /* Common code for x86 XSAVE extended state.
   2
   3    Copyright (C) 2010-2024 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef COMMON_X86_XSTATE_H
  21 #define COMMON_X86_XSTATE_H
  22
  23 /* The extended state feature IDs in the state component bitmap.  */
  24 #define X86_XSTATE_X87_ID       0
  25 #define X86_XSTATE_SSE_ID       1
  26 #define X86_XSTATE_AVX_ID       2
  27 #define X86_XSTATE_BNDREGS_ID   3
  28 #define X86_XSTATE_BNDCFG_ID    4
  29 #define X86_XSTATE_K_ID         5
  30 #define X86_XSTATE_ZMM_H_ID     6
  31 #define X86_XSTATE_ZMM_ID       7
  32 #define X86_XSTATE_PKRU_ID      9
  33
  34 /* The extended state feature bits.  */
  35 #define X86_XSTATE_X87          (1ULL << X86_XSTATE_X87_ID)
  36 #define X86_XSTATE_SSE          (1ULL << X86_XSTATE_SSE_ID)
  37 #define X86_XSTATE_AVX          (1ULL << X86_XSTATE_AVX_ID)
  38 #define X86_XSTATE_BNDREGS      (1ULL << X86_XSTATE_BNDREGS_ID)
  39 #define X86_XSTATE_BNDCFG       (1ULL << X86_XSTATE_BNDCFG_ID)
  40 #define X86_XSTATE_MPX          (X86_XSTATE_BNDREGS | X86_XSTATE_BNDCFG)
  41
  42 /* AVX 512 adds three feature bits.  All three must be enabled.  */
  43 #define X86_XSTATE_K            (1ULL << X86_XSTATE_K_ID)
  44 #define X86_XSTATE_ZMM_H        (1ULL << X86_XSTATE_ZMM_H_ID)
  45 #define X86_XSTATE_ZMM          (1ULL << X86_XSTATE_ZMM_ID)
  46 #define X86_XSTATE_AVX512       (X86_XSTATE_K | X86_XSTATE_ZMM_H \
  47                                  | X86_XSTATE_ZMM)
  48
  49 #define X86_XSTATE_PKRU         (1ULL << X86_XSTATE_PKRU_ID)
  50
  51 /* Total size of the XSAVE area extended region and offsets of
  52    register states within the region.  Offsets are set to 0 to
  53    indicate the absence of the associated registers.  */
  54
  55 struct x86_xsave_layout
  56 {
  57   int sizeof_xsave = 0;
  58   int avx_offset = 0;
  59   int bndregs_offset = 0;
  60   int bndcfg_offset = 0;
  61   int k_offset = 0;
  62   int zmm_h_offset = 0;
  63   int zmm_offset = 0;
  64   int pkru_offset = 0;
  65 };
  66
  67 constexpr bool operator== (const x86_xsave_layout &lhs,
  68                            const x86_xsave_layout &rhs)
  69 {
  70   return lhs.sizeof_xsave == rhs.sizeof_xsave
  71     && lhs.avx_offset == rhs.avx_offset
  72     && lhs.bndregs_offset == rhs.bndregs_offset
  73     && lhs.bndcfg_offset == rhs.bndcfg_offset
  74     && lhs.k_offset == rhs.k_offset
  75     && lhs.zmm_h_offset == rhs.zmm_h_offset
  76     && lhs.zmm_offset == rhs.zmm_offset
  77     && lhs.pkru_offset == rhs.pkru_offset;
  78 }
  79
  80 constexpr bool operator!= (const x86_xsave_layout &lhs,
  81                            const x86_xsave_layout &rhs)
  82 {
  83   return !(lhs == rhs);
  84 }
  85
  86
  87 /* Supported mask and size of the extended state.  */
  88 #define X86_XSTATE_X87_MASK     X86_XSTATE_X87
  89 #define X86_XSTATE_SSE_MASK     (X86_XSTATE_X87 | X86_XSTATE_SSE)
  90 #define X86_XSTATE_AVX_MASK     (X86_XSTATE_SSE_MASK | X86_XSTATE_AVX)
  91 #define X86_XSTATE_MPX_MASK     (X86_XSTATE_SSE_MASK | X86_XSTATE_MPX)
  92 #define X86_XSTATE_AVX_MPX_MASK (X86_XSTATE_AVX_MASK | X86_XSTATE_MPX)
  93 #define X86_XSTATE_AVX_AVX512_MASK      (X86_XSTATE_AVX_MASK | X86_XSTATE_AVX512)
  94 #define X86_XSTATE_AVX_MPX_AVX512_PKU_MASK      (X86_XSTATE_AVX_MPX_MASK\
  95                                         | X86_XSTATE_AVX512 | X86_XSTATE_PKRU)
  96
  97 #define X86_XSTATE_ALL_MASK             (X86_XSTATE_AVX_MPX_AVX512_PKU_MASK)
  98
  99
 100 #define X86_XSTATE_SSE_SIZE     576
 101 #define X86_XSTATE_AVX_SIZE     832
 102
 103
 104 /* In case one of the MPX XCR0 bits is set we consider we have MPX.  */
 105 #define HAS_MPX(XCR0) (((XCR0) & X86_XSTATE_MPX) != 0)
 106 #define HAS_AVX(XCR0) (((XCR0) & X86_XSTATE_AVX) != 0)
 107 #define HAS_AVX512(XCR0) (((XCR0) & X86_XSTATE_AVX512) != 0)
 108 #define HAS_PKRU(XCR0) (((XCR0) & X86_XSTATE_PKRU) != 0)
 109
 110 /* Initial value for fctrl register, as defined in the X86 manual, and
 111    confirmed in the (Linux) kernel source.  When the x87 floating point
 112    feature is not enabled in an inferior we use this as the value of the
 113    fcrtl register.  */
 114
 115 #define I387_FCTRL_INIT_VAL 0x037f
 116
 117 /* Initial value for mxcsr register.  When the avx and sse floating point
 118    features are not enabled in an inferior we use this as the value of the
 119    mxcsr register.  */
 120
 121 #define I387_MXCSR_INIT_VAL 0x1f80
 122
 123 #endif /* COMMON_X86_XSTATE_H */