gdb/gdbserver/tdesc.c

   1 /* Copyright (C) 2012-2018 Free Software Foundation, Inc.
   2
   3    This file is part of GDB.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  17
  18 #include "server.h"
  19 #include "tdesc.h"
  20 #include "regdef.h"
  21
  22 #ifndef IN_PROCESS_AGENT
  23
  24 target_desc::~target_desc ()
  25 {
  26   xfree ((char *) arch);
  27   xfree ((char *) osabi);
  28 }
  29
  30 bool target_desc::operator== (const target_desc &other) const
  31 {
  32   if (reg_defs != other.reg_defs)
  33     return false;
  34
  35   /* Compare expedite_regs.  */
  36   int i = 0;
  37   for (; expedite_regs[i] != NULL; i++)
  38     {
  39       if (strcmp (expedite_regs[i], other.expedite_regs[i]) != 0)
  40         return false;
  41     }
  42   if (other.expedite_regs[i] != NULL)
  43     return false;
  44
  45   return true;
  46 }
  47
  48 #endif
  49
  50 void target_desc::accept (tdesc_element_visitor &v) const
  51 {
  52 #ifndef IN_PROCESS_AGENT
  53   v.visit_pre (this);
  54
  55   for (const tdesc_feature_up &feature : features)
  56     feature->accept (v);
  57
  58   v.visit_post (this);
  59 #endif
  60 }
  61
  62 void
  63 init_target_desc (struct target_desc *tdesc)
  64 {
  65   int offset = 0;
  66
  67   /* Go through all the features and populate reg_defs.  */
  68   for (const tdesc_feature_up &feature : tdesc->features)
  69     for (const tdesc_reg_up &treg : feature->registers)
  70       {
  71         int regnum = treg->target_regnum;
  72
  73         /* Register number will increase (possibly with gaps) or be zero.  */
  74         gdb_assert (regnum == 0 || regnum >= tdesc->reg_defs.size ());
  75
  76         if (regnum != 0)
  77           tdesc->reg_defs.resize (regnum, reg (offset));
  78
  79         tdesc->reg_defs.emplace_back (treg->name.c_str (), offset,
  80                                       treg->bitsize);
  81         offset += treg->bitsize;
  82       }
  83
  84   tdesc->registers_size = offset / 8;
  85
  86   /* Make sure PBUFSIZ is large enough to hold a full register
  87      packet.  */
  88   gdb_assert (2 * tdesc->registers_size + 32 <= PBUFSIZ);
  89 }
  90
  91 struct target_desc *
  92 allocate_target_description (void)
  93 {
  94   return new target_desc ();
  95 }
  96
  97 #ifndef IN_PROCESS_AGENT
  98
  99 static const struct target_desc default_description {};
 100
 101 void
 102 copy_target_description (struct target_desc *dest,
 103                          const struct target_desc *src)
 104 {
 105   dest->reg_defs = src->reg_defs;
 106   dest->expedite_regs = src->expedite_regs;
 107   dest->registers_size = src->registers_size;
 108   dest->xmltarget = src->xmltarget;
 109 }
 110
 111 const struct target_desc *
 112 current_target_desc (void)
 113 {
 114   if (current_thread == NULL)
 115     return &default_description;
 116
 117   return current_process ()->tdesc;
 118 }
 119
 120 /* See common/tdesc.h.  */
 121
 122 const char *
 123 tdesc_architecture_name (const struct target_desc *target_desc)
 124 {
 125   return target_desc->arch;
 126 }
 127
 128 /* See common/tdesc.h.  */
 129
 130 void
 131 set_tdesc_architecture (struct target_desc *target_desc,
 132                         const char *name)
 133 {
 134   target_desc->arch = xstrdup (name);
 135 }
 136
 137 /* See common/tdesc.h.  */
 138
 139 const char *
 140 tdesc_osabi_name (const struct target_desc *target_desc)
 141 {
 142   return target_desc->osabi;
 143 }
 144
 145 /* See common/tdesc.h.  */
 146
 147 void
 148 set_tdesc_osabi (struct target_desc *target_desc, const char *name)
 149 {
 150   target_desc->osabi = xstrdup (name);
 151 }
 152
 153 /* See common/tdesc.h.  */
 154
 155 const char *
 156 tdesc_get_features_xml (const target_desc *tdesc)
 157 {
 158   /* Either .xmltarget or .features is not NULL.  */
 159   gdb_assert (tdesc->xmltarget != NULL
 160               || (!tdesc->features.empty ()
 161                   && tdesc->arch != NULL));
 162
 163   if (tdesc->xmltarget == NULL)
 164     {
 165       std::string buffer ("@");
 166       print_xml_feature v (&buffer);
 167       tdesc->accept (v);
 168       tdesc->xmltarget = xstrdup (buffer.c_str ());
 169     }
 170
 171   return tdesc->xmltarget;
 172 }
 173 #endif
 174
 175 /* See common/tdesc.h.  */
 176
 177 struct tdesc_feature *
 178 tdesc_create_feature (struct target_desc *tdesc, const char *name)
 179 {
 180   struct tdesc_feature *new_feature = new tdesc_feature (name);
 181   tdesc->features.emplace_back (new_feature);
 182   return new_feature;
 183 }