gdb/gdbserver/linux-x86-tdesc.c

   1 /* GNU/Linux/x86-64 specific target description, for the remote server
   2    for GDB.
   3    Copyright (C) 2017 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 #include "server.h"
  21 #include "tdesc.h"
  22 #include "linux-x86-tdesc.h"
  23 #include "arch/i386.h"
  24 #include "common/x86-xstate.h"
  25
  26 static struct target_desc *i386_tdescs[X86_TDESC_LAST] = { };
  27
  28 #if defined __i386__ || !defined IN_PROCESS_AGENT
  29
  30 /* Return the target description according to XCR0.  */
  31
  32 const struct target_desc *
  33 i386_linux_read_description (uint64_t xcr0)
  34 {
  35   struct target_desc **tdesc = NULL;
  36
  37   if (xcr0 & X86_XSTATE_PKRU)
  38      tdesc = &i386_tdescs[X86_TDESC_AVX_MPX_AVX512_PKU];
  39   else if (xcr0 & X86_XSTATE_AVX512)
  40     tdesc = &i386_tdescs[X86_TDESC_AVX_AVX512];
  41   else if ((xcr0 & X86_XSTATE_AVX_MPX_MASK) == X86_XSTATE_AVX_MPX_MASK)
  42     tdesc = &i386_tdescs[X86_TDESC_AVX_MPX];
  43   else if (xcr0 & X86_XSTATE_MPX)
  44     tdesc = &i386_tdescs[X86_TDESC_MPX];
  45   else if (xcr0 & X86_XSTATE_AVX)
  46     tdesc = &i386_tdescs[X86_TDESC_AVX];
  47   else if (xcr0 & X86_XSTATE_SSE)
  48     tdesc = &i386_tdescs[X86_TDESC_SSE];
  49   else if (xcr0 & X86_XSTATE_X87)
  50     tdesc = &i386_tdescs[X86_TDESC_MMX];
  51
  52   if (tdesc == NULL)
  53     return NULL;
  54
  55   if (*tdesc == NULL)
  56     {
  57       *tdesc = i386_create_target_description (xcr0);
  58
  59       init_target_desc (*tdesc);
  60
  61 #ifndef IN_PROCESS_AGENT
  62       static const char *expedite_regs_i386[] = { "ebp", "esp", "eip", NULL };
  63       (*tdesc)->expedite_regs = expedite_regs_i386;
  64 #endif
  65     }
  66
  67   return *tdesc;;
  68 }
  69 #endif
  70
  71 #ifndef IN_PROCESS_AGENT
  72 int
  73 i386_get_ipa_tdesc_idx (const struct target_desc *tdesc)
  74 {
  75   for (int i = 0; i < X86_TDESC_LAST; i++)
  76     {
  77       if (tdesc == i386_tdescs[i])
  78         return i;
  79     }
  80
  81   /* If none tdesc is found, return the one with minimum features.  */
  82   return X86_TDESC_MMX;
  83 }
  84
  85 #endif