gdbserver/nto-x86-low.cc

   1 /* QNX Neutrino specific low level interface, for the remote server
   2    for GDB.
   3    Copyright (C) 2009-2020 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 "nto-low.h"
  22 #include "regdef.h"
  23 #include "regcache.h"
  24
  25 #include <x86/context.h>
  26 #include "gdbsupport/x86-xstate.h"
  27 #include "arch/i386.h"
  28 #include "x86-tdesc.h"
  29
  30 const unsigned char x86_breakpoint[] = { 0xCC };
  31 #define x86_breakpoint_len 1
  32
  33 /* Returns offset in appropriate Neutrino's context structure.
  34    Defined in x86/context.h.
  35    GDBREGNO is index into regs_i386 array.  It is autogenerated and
  36    hopefully doesn't change.  */
  37 static int
  38 nto_x86_register_offset (int gdbregno)
  39 {
  40   if (gdbregno >= 0 && gdbregno < 16)
  41     {
  42       X86_CPU_REGISTERS *dummy = (void*)0;
  43       /* GPRs  */
  44       switch (gdbregno)
  45         {
  46         case 0:
  47           return (int)&(dummy->eax);
  48         case 1:
  49           return (int)&(dummy->ecx);
  50         case 2:
  51           return (int)&(dummy->edx);
  52         case 3:
  53           return (int)&(dummy->ebx);
  54         case 4:
  55           return (int)&(dummy->esp);
  56         case 5:
  57           return (int)&(dummy->ebp);
  58         case 6:
  59           return (int)&(dummy->esi);
  60         case 7:
  61           return (int)&(dummy->edi);
  62         case 8:
  63           return (int)&(dummy->eip);
  64         case 9:
  65           return (int)&(dummy->efl);
  66         case 10:
  67           return (int)&(dummy->cs);
  68         case 11:
  69           return (int)&(dummy->ss);
  70 #ifdef __SEGMENTS__
  71         case 12:
  72           return (int)&(dummy->ds);
  73         case 13:
  74           return (int)&(dummy->es);
  75         case 14:
  76           return (int)&(dummy->fs);
  77         case 15:
  78           return (int)&(dummy->gs);
  79 #endif
  80         default:
  81           return -1;
  82         }
  83     }
  84   return -1;
  85 }
  86
  87 static void
  88 nto_x86_arch_setup (void)
  89 {
  90   the_low_target.num_regs = 16;
  91   struct target_desc *tdesc
  92     = i386_create_target_description (X86_XSTATE_SSE_MASK, false, false);
  93
  94   init_target_desc (tdesc, i386_expedite_regs);
  95
  96   nto_tdesc = tdesc;
  97 }
  98
  99 struct nto_target_ops the_low_target =
 100 {
 101   nto_x86_arch_setup,
 102   0, /* num_regs */
 103   nto_x86_register_offset,
 104   x86_breakpoint,
 105   x86_breakpoint_len
 106 };
 107
 108
 109