gdb/i386-cygwin-tdep.c

   1 /* Target-dependent code for Cygwin running on i386's, for GDB.
   2
   3    Copyright (C) 2003-2014 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 "defs.h"
  21 #include "osabi.h"
  22 #include "i386-tdep.h"
  23 #include "windows-tdep.h"
  24 #include "regset.h"
  25 #include "gdb_obstack.h"
  26 #include "xml-support.h"
  27 #include "gdbcore.h"
  28 #include "inferior.h"
  29
  30 /* Core file support.  */
  31
  32 /* This vector maps GDB's idea of a register's number into an address
  33    in the windows exception context vector.  */
  34
  35 static int i386_windows_gregset_reg_offset[] =
  36 {
  37   176, /* eax */
  38   172, /* ecx */
  39   168, /* edx */
  40   164, /* ebx */
  41
  42   196, /* esp */
  43   180, /* ebp */
  44   160, /* esi */
  45   156, /* edi */
  46
  47   184, /* eip */
  48   192, /* eflags */
  49   188, /* cs */
  50   200, /* ss */
  51
  52   152, /* ds */
  53   148, /* es */
  54   144, /* fs */
  55   140, /* gs */
  56
  57   56, /* FloatSave.RegisterArea[0 * 10] */
  58   66, /* FloatSave.RegisterArea[1 * 10] */
  59   76, /* FloatSave.RegisterArea[2 * 10] */
  60   86, /* FloatSave.RegisterArea[3 * 10] */
  61   96, /* FloatSave.RegisterArea[4 * 10] */
  62   106, /* FloatSave.RegisterArea[5 * 10] */
  63   116, /* FloatSave.RegisterArea[6 * 10] */
  64   126, /* FloatSave.RegisterArea[7 * 10] */
  65
  66   28, /* FloatSave.ControlWord */
  67   32, /* FloatSave.StatusWord */
  68   36, /* FloatSave.TagWord */
  69   44, /* FloatSave.ErrorSelector */
  70   40, /* FloatSave.ErrorOffset */
  71   52, /* FloatSave.DataSelector */
  72   48, /* FloatSave.DataOffset */
  73   44, /* FloatSave.ErrorSelector */
  74
  75   /* XMM0-7 */
  76   364, /* ExtendedRegisters[10*16] */
  77   380, /* ExtendedRegisters[11*16] */
  78   396, /* ExtendedRegisters[12*16] */
  79   412, /* ExtendedRegisters[13*16] */
  80   428, /* ExtendedRegisters[14*16] */
  81   444, /* ExtendedRegisters[15*16] */
  82   460, /* ExtendedRegisters[16*16] */
  83   476, /* ExtendedRegisters[17*16] */
  84
  85   /* MXCSR */
  86   228 /* ExtendedRegisters[24] */
  87 };
  88
  89 #define I386_WINDOWS_SIZEOF_GREGSET 716
  90
  91 /* Return the appropriate register set for the core section identified
  92    by SECT_NAME and SECT_SIZE.  */
  93
  94 static const struct regset *
  95 i386_windows_regset_from_core_section (struct gdbarch *gdbarch,
  96                                      const char *sect_name, size_t sect_size)
  97 {
  98   if (strcmp (sect_name, ".reg") == 0
  99       && sect_size == I386_WINDOWS_SIZEOF_GREGSET)
 100     return &i386_gregset;
 101
 102   return NULL;
 103 }
 104
 105 struct cpms_data
 106 {
 107   struct gdbarch *gdbarch;
 108   struct obstack *obstack;
 109   int module_count;
 110 };
 111
 112 static void
 113 core_process_module_section (bfd *abfd, asection *sect, void *obj)
 114 {
 115   struct cpms_data *data = obj;
 116   enum bfd_endian byte_order = gdbarch_byte_order (data->gdbarch);
 117
 118   char *module_name;
 119   size_t module_name_size;
 120   CORE_ADDR base_addr;
 121
 122   gdb_byte *buf = NULL;
 123
 124   if (strncmp (sect->name, ".module", 7) != 0)
 125     return;
 126
 127   buf = xmalloc (bfd_get_section_size (sect) + 1);
 128   if (!buf)
 129     {
 130       printf_unfiltered ("memory allocation failed for %s\n", sect->name);
 131       goto out;
 132     }
 133   if (!bfd_get_section_contents (abfd, sect,
 134                                  buf, 0, bfd_get_section_size (sect)))
 135     goto out;
 136
 137
 138
 139   /* A DWORD (data_type) followed by struct windows_core_module_info.  */
 140
 141   base_addr =
 142     extract_unsigned_integer (buf + 4, 4, byte_order);
 143
 144   module_name_size =
 145     extract_unsigned_integer (buf + 8, 4, byte_order);
 146
 147   if (12 + module_name_size > bfd_get_section_size (sect))
 148     goto out;
 149   module_name = (char *) buf + 12;
 150
 151   /* The first module is the .exe itself.  */
 152   if (data->module_count != 0)
 153     windows_xfer_shared_library (module_name, base_addr,
 154                                  data->gdbarch, data->obstack);
 155   data->module_count++;
 156
 157 out:
 158   if (buf)
 159     xfree (buf);
 160   return;
 161 }
 162
 163 static ULONGEST
 164 windows_core_xfer_shared_libraries (struct gdbarch *gdbarch,
 165                                   gdb_byte *readbuf,
 166                                   ULONGEST offset, ULONGEST len)
 167 {
 168   struct obstack obstack;
 169   const char *buf;
 170   ULONGEST len_avail;
 171   struct cpms_data data = { gdbarch, &obstack, 0 };
 172
 173   obstack_init (&obstack);
 174   obstack_grow_str (&obstack, "<library-list>\n");
 175   bfd_map_over_sections (core_bfd,
 176                          core_process_module_section,
 177                          &data);
 178   obstack_grow_str0 (&obstack, "</library-list>\n");
 179
 180   buf = obstack_finish (&obstack);
 181   len_avail = strlen (buf);
 182   if (offset >= len_avail)
 183     return 0;
 184
 185   if (len > len_avail - offset)
 186     len = len_avail - offset;
 187   memcpy (readbuf, buf + offset, len);
 188
 189   obstack_free (&obstack, NULL);
 190   return len;
 191 }
 192
 193 /* This is how we want PTIDs from core files to be printed.  */
 194
 195 static char *
 196 i386_windows_core_pid_to_str (struct gdbarch *gdbarch, ptid_t ptid)
 197 {
 198   static char buf[80];
 199
 200   if (ptid_get_lwp (ptid) != 0)
 201     {
 202       snprintf (buf, sizeof (buf), "Thread 0x%lx", ptid_get_lwp (ptid));
 203       return buf;
 204     }
 205
 206   return normal_pid_to_str (ptid);
 207 }
 208
 209 static CORE_ADDR
 210 i386_cygwin_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
 211 {
 212   return i386_pe_skip_trampoline_code (frame, pc, NULL);
 213 }
 214
 215 static const char *
 216 i386_cygwin_auto_wide_charset (void)
 217 {
 218   return "UTF-16";
 219 }
 220
 221 static void
 222 i386_cygwin_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 223 {
 224   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 225
 226   windows_init_abi (info, gdbarch);
 227
 228   set_gdbarch_skip_trampoline_code (gdbarch, i386_cygwin_skip_trampoline_code);
 229
 230   set_gdbarch_skip_main_prologue (gdbarch, i386_skip_main_prologue);
 231
 232   tdep->struct_return = reg_struct_return;
 233
 234   tdep->gregset_reg_offset = i386_windows_gregset_reg_offset;
 235   tdep->gregset_num_regs = ARRAY_SIZE (i386_windows_gregset_reg_offset);
 236   tdep->sizeof_gregset = I386_WINDOWS_SIZEOF_GREGSET;
 237
 238   /* Core file support.  */
 239   set_gdbarch_regset_from_core_section
 240     (gdbarch, i386_windows_regset_from_core_section);
 241   set_gdbarch_core_xfer_shared_libraries
 242     (gdbarch, windows_core_xfer_shared_libraries);
 243   set_gdbarch_core_pid_to_str (gdbarch, i386_windows_core_pid_to_str);
 244
 245   set_gdbarch_auto_wide_charset (gdbarch, i386_cygwin_auto_wide_charset);
 246 }
 247
 248 static enum gdb_osabi
 249 i386_cygwin_osabi_sniffer (bfd *abfd)
 250 {
 251   char *target_name = bfd_get_target (abfd);
 252
 253   if (strcmp (target_name, "pei-i386") == 0)
 254     return GDB_OSABI_CYGWIN;
 255
 256   /* Cygwin uses elf core dumps.  Do not claim all ELF executables,
 257      check whether there is a .reg section of proper size.  */
 258   if (strcmp (target_name, "elf32-i386") == 0)
 259     {
 260       asection *section = bfd_get_section_by_name (abfd, ".reg");
 261       if (section
 262           && bfd_section_size (abfd, section) == I386_WINDOWS_SIZEOF_GREGSET)
 263         return GDB_OSABI_CYGWIN;
 264     }
 265
 266   return GDB_OSABI_UNKNOWN;
 267 }
 268
 269 /* Provide a prototype to silence -Wmissing-prototypes.  */
 270 void _initialize_i386_cygwin_tdep (void);
 271
 272 void
 273 _initialize_i386_cygwin_tdep (void)
 274 {
 275   gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_coff_flavour,
 276                                   i386_cygwin_osabi_sniffer);
 277
 278   /* Cygwin uses elf core dumps.  */
 279   gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_elf_flavour,
 280                                   i386_cygwin_osabi_sniffer);
 281
 282   gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_CYGWIN,
 283                           i386_cygwin_init_abi);
 284 }