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 <string.h>
  23 #include "i386-tdep.h"
  24 #include "windows-tdep.h"
  25 #include "regset.h"
  26 #include "gdb_obstack.h"
  27 #include "xml-support.h"
  28 #include "gdbcore.h"
  29 #include "inferior.h"
  30
  31 /* Core file support.  */
  32
  33 /* This vector maps GDB's idea of a register's number into an address
  34    in the windows exception context vector.  */
  35
  36 static int i386_windows_gregset_reg_offset[] =
  37 {
  38   176, /* eax */
  39   172, /* ecx */
  40   168, /* edx */
  41   164, /* ebx */
  42
  43   196, /* esp */
  44   180, /* ebp */
  45   160, /* esi */
  46   156, /* edi */
  47
  48   184, /* eip */
  49   192, /* eflags */
  50   188, /* cs */
  51   200, /* ss */
  52
  53   152, /* ds */
  54   148, /* es */
  55   144, /* fs */
  56   140, /* gs */
  57
  58   56, /* FloatSave.RegisterArea[0 * 10] */
  59   66, /* FloatSave.RegisterArea[1 * 10] */
  60   76, /* FloatSave.RegisterArea[2 * 10] */
  61   86, /* FloatSave.RegisterArea[3 * 10] */
  62   96, /* FloatSave.RegisterArea[4 * 10] */
  63   106, /* FloatSave.RegisterArea[5 * 10] */
  64   116, /* FloatSave.RegisterArea[6 * 10] */
  65   126, /* FloatSave.RegisterArea[7 * 10] */
  66
  67   28, /* FloatSave.ControlWord */
  68   32, /* FloatSave.StatusWord */
  69   36, /* FloatSave.TagWord */
  70   44, /* FloatSave.ErrorSelector */
  71   40, /* FloatSave.ErrorOffset */
  72   52, /* FloatSave.DataSelector */
  73   48, /* FloatSave.DataOffset */
  74   44, /* FloatSave.ErrorSelector */
  75
  76   /* XMM0-7 */
  77   364, /* ExtendedRegisters[10*16] */
  78   380, /* ExtendedRegisters[11*16] */
  79   396, /* ExtendedRegisters[12*16] */
  80   412, /* ExtendedRegisters[13*16] */
  81   428, /* ExtendedRegisters[14*16] */
  82   444, /* ExtendedRegisters[15*16] */
  83   460, /* ExtendedRegisters[16*16] */
  84   476, /* ExtendedRegisters[17*16] */
  85
  86   /* MXCSR */
  87   228 /* ExtendedRegisters[24] */
  88 };
  89
  90 #define I386_WINDOWS_SIZEOF_GREGSET 716
  91
  92 /* Return the appropriate register set for the core section identified
  93    by SECT_NAME and SECT_SIZE.  */
  94
  95 static const struct regset *
  96 i386_windows_regset_from_core_section (struct gdbarch *gdbarch,
  97                                      const char *sect_name, size_t sect_size)
  98 {
  99   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 100
 101   if (strcmp (sect_name, ".reg") == 0
 102       && sect_size == I386_WINDOWS_SIZEOF_GREGSET)
 103     {
 104       if (tdep->gregset == NULL)
 105         tdep->gregset = regset_alloc (gdbarch, i386_supply_gregset,
 106                                       i386_collect_gregset);
 107       return tdep->gregset;
 108     }
 109
 110   return NULL;
 111 }
 112
 113 struct cpms_data
 114 {
 115   struct gdbarch *gdbarch;
 116   struct obstack *obstack;
 117   int module_count;
 118 };
 119
 120 static void
 121 core_process_module_section (bfd *abfd, asection *sect, void *obj)
 122 {
 123   struct cpms_data *data = obj;
 124   enum bfd_endian byte_order = gdbarch_byte_order (data->gdbarch);
 125
 126   char *module_name;
 127   size_t module_name_size;
 128   CORE_ADDR base_addr;
 129
 130   gdb_byte *buf = NULL;
 131
 132   if (strncmp (sect->name, ".module", 7) != 0)
 133     return;
 134
 135   buf = xmalloc (bfd_get_section_size (sect) + 1);
 136   if (!buf)
 137     {
 138       printf_unfiltered ("memory allocation failed for %s\n", sect->name);
 139       goto out;
 140     }
 141   if (!bfd_get_section_contents (abfd, sect,
 142                                  buf, 0, bfd_get_section_size (sect)))
 143     goto out;
 144
 145
 146
 147   /* A DWORD (data_type) followed by struct windows_core_module_info.  */
 148
 149   base_addr =
 150     extract_unsigned_integer (buf + 4, 4, byte_order);
 151
 152   module_name_size =
 153     extract_unsigned_integer (buf + 8, 4, byte_order);
 154
 155   if (12 + module_name_size > bfd_get_section_size (sect))
 156     goto out;
 157   module_name = (char *) buf + 12;
 158
 159   /* The first module is the .exe itself.  */
 160   if (data->module_count != 0)
 161     windows_xfer_shared_library (module_name, base_addr,
 162                                  data->gdbarch, data->obstack);
 163   data->module_count++;
 164
 165 out:
 166   if (buf)
 167     xfree (buf);
 168   return;
 169 }
 170
 171 static LONGEST
 172 windows_core_xfer_shared_libraries (struct gdbarch *gdbarch,
 173                                   gdb_byte *readbuf,
 174                                   ULONGEST offset, LONGEST len)
 175 {
 176   struct obstack obstack;
 177   const char *buf;
 178   LONGEST len_avail;
 179   struct cpms_data data = { gdbarch, &obstack, 0 };
 180
 181   obstack_init (&obstack);
 182   obstack_grow_str (&obstack, "<library-list>\n");
 183   bfd_map_over_sections (core_bfd,
 184                          core_process_module_section,
 185                          &data);
 186   obstack_grow_str0 (&obstack, "</library-list>\n");
 187
 188   buf = obstack_finish (&obstack);
 189   len_avail = strlen (buf);
 190   if (offset >= len_avail)
 191     return 0;
 192
 193   if (len > len_avail - offset)
 194     len = len_avail - offset;
 195   memcpy (readbuf, buf + offset, len);
 196
 197   obstack_free (&obstack, NULL);
 198   return len;
 199 }
 200
 201 /* This is how we want PTIDs from core files to be printed.  */
 202
 203 static char *
 204 i386_windows_core_pid_to_str (struct gdbarch *gdbarch, ptid_t ptid)
 205 {
 206   static char buf[80];
 207
 208   if (ptid_get_lwp (ptid) != 0)
 209     {
 210       snprintf (buf, sizeof (buf), "Thread 0x%lx", ptid_get_lwp (ptid));
 211       return buf;
 212     }
 213
 214   return normal_pid_to_str (ptid);
 215 }
 216
 217 static CORE_ADDR
 218 i386_cygwin_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
 219 {
 220   return i386_pe_skip_trampoline_code (frame, pc, NULL);
 221 }
 222
 223 static const char *
 224 i386_cygwin_auto_wide_charset (void)
 225 {
 226   return "UTF-16";
 227 }
 228
 229 static void
 230 i386_cygwin_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 231 {
 232   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 233
 234   windows_init_abi (info, gdbarch);
 235
 236   set_gdbarch_skip_trampoline_code (gdbarch, i386_cygwin_skip_trampoline_code);
 237
 238   set_gdbarch_skip_main_prologue (gdbarch, i386_skip_main_prologue);
 239
 240   tdep->struct_return = reg_struct_return;
 241
 242   tdep->gregset_reg_offset = i386_windows_gregset_reg_offset;
 243   tdep->gregset_num_regs = ARRAY_SIZE (i386_windows_gregset_reg_offset);
 244   tdep->sizeof_gregset = I386_WINDOWS_SIZEOF_GREGSET;
 245
 246   /* Core file support.  */
 247   set_gdbarch_regset_from_core_section
 248     (gdbarch, i386_windows_regset_from_core_section);
 249   set_gdbarch_core_xfer_shared_libraries
 250     (gdbarch, windows_core_xfer_shared_libraries);
 251   set_gdbarch_core_pid_to_str (gdbarch, i386_windows_core_pid_to_str);
 252
 253   set_gdbarch_auto_wide_charset (gdbarch, i386_cygwin_auto_wide_charset);
 254 }
 255
 256 static enum gdb_osabi
 257 i386_cygwin_osabi_sniffer (bfd *abfd)
 258 {
 259   char *target_name = bfd_get_target (abfd);
 260
 261   if (strcmp (target_name, "pei-i386") == 0)
 262     return GDB_OSABI_CYGWIN;
 263
 264   /* Cygwin uses elf core dumps.  Do not claim all ELF executables,
 265      check whether there is a .reg section of proper size.  */
 266   if (strcmp (target_name, "elf32-i386") == 0)
 267     {
 268       asection *section = bfd_get_section_by_name (abfd, ".reg");
 269       if (section
 270           && bfd_section_size (abfd, section) == I386_WINDOWS_SIZEOF_GREGSET)
 271         return GDB_OSABI_CYGWIN;
 272     }
 273
 274   return GDB_OSABI_UNKNOWN;
 275 }
 276
 277 /* Provide a prototype to silence -Wmissing-prototypes.  */
 278 void _initialize_i386_cygwin_tdep (void);
 279
 280 void
 281 _initialize_i386_cygwin_tdep (void)
 282 {
 283   gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_coff_flavour,
 284                                   i386_cygwin_osabi_sniffer);
 285
 286   /* Cygwin uses elf core dumps.  */
 287   gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_elf_flavour,
 288                                   i386_cygwin_osabi_sniffer);
 289
 290   gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_CYGWIN,
 291                           i386_cygwin_init_abi);
 292 }