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   if (strcmp (sect_name, ".reg") == 0
 100       && sect_size == I386_WINDOWS_SIZEOF_GREGSET)
 101     return &i386_gregset;
 102
 103   return NULL;
 104 }
 105
 106 struct cpms_data
 107 {
 108   struct gdbarch *gdbarch;
 109   struct obstack *obstack;
 110   int module_count;
 111 };
 112
 113 static void
 114 core_process_module_section (bfd *abfd, asection *sect, void *obj)
 115 {
 116   struct cpms_data *data = obj;
 117   enum bfd_endian byte_order = gdbarch_byte_order (data->gdbarch);
 118
 119   char *module_name;
 120   size_t module_name_size;
 121   CORE_ADDR base_addr;
 122
 123   gdb_byte *buf = NULL;
 124
 125   if (strncmp (sect->name, ".module", 7) != 0)
 126     return;
 127
 128   buf = xmalloc (bfd_get_section_size (sect) + 1);
 129   if (!buf)
 130     {
 131       printf_unfiltered ("memory allocation failed for %s\n", sect->name);
 132       goto out;
 133     }
 134   if (!bfd_get_section_contents (abfd, sect,
 135                                  buf, 0, bfd_get_section_size (sect)))
 136     goto out;
 137
 138
 139
 140   /* A DWORD (data_type) followed by struct windows_core_module_info.  */
 141
 142   base_addr =
 143     extract_unsigned_integer (buf + 4, 4, byte_order);
 144
 145   module_name_size =
 146     extract_unsigned_integer (buf + 8, 4, byte_order);
 147
 148   if (12 + module_name_size > bfd_get_section_size (sect))
 149     goto out;
 150   module_name = (char *) buf + 12;
 151
 152   /* The first module is the .exe itself.  */
 153   if (data->module_count != 0)
 154     windows_xfer_shared_library (module_name, base_addr,
 155                                  data->gdbarch, data->obstack);
 156   data->module_count++;
 157
 158 out:
 159   if (buf)
 160     xfree (buf);
 161   return;
 162 }
 163
 164 static ULONGEST
 165 windows_core_xfer_shared_libraries (struct gdbarch *gdbarch,
 166                                   gdb_byte *readbuf,
 167                                   ULONGEST offset, ULONGEST len)
 168 {
 169   struct obstack obstack;
 170   const char *buf;
 171   ULONGEST len_avail;
 172   struct cpms_data data = { gdbarch, &obstack, 0 };
 173
 174   obstack_init (&obstack);
 175   obstack_grow_str (&obstack, "<library-list>\n");
 176   bfd_map_over_sections (core_bfd,
 177                          core_process_module_section,
 178                          &data);
 179   obstack_grow_str0 (&obstack, "</library-list>\n");
 180
 181   buf = obstack_finish (&obstack);
 182   len_avail = strlen (buf);
 183   if (offset >= len_avail)
 184     return 0;
 185
 186   if (len > len_avail - offset)
 187     len = len_avail - offset;
 188   memcpy (readbuf, buf + offset, len);
 189
 190   obstack_free (&obstack, NULL);
 191   return len;
 192 }
 193
 194 /* This is how we want PTIDs from core files to be printed.  */
 195
 196 static char *
 197 i386_windows_core_pid_to_str (struct gdbarch *gdbarch, ptid_t ptid)
 198 {
 199   static char buf[80];
 200
 201   if (ptid_get_lwp (ptid) != 0)
 202     {
 203       snprintf (buf, sizeof (buf), "Thread 0x%lx", ptid_get_lwp (ptid));
 204       return buf;
 205     }
 206
 207   return normal_pid_to_str (ptid);
 208 }
 209
 210 static CORE_ADDR
 211 i386_cygwin_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
 212 {
 213   return i386_pe_skip_trampoline_code (frame, pc, NULL);
 214 }
 215
 216 static const char *
 217 i386_cygwin_auto_wide_charset (void)
 218 {
 219   return "UTF-16";
 220 }
 221
 222 static void
 223 i386_cygwin_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 224 {
 225   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 226
 227   windows_init_abi (info, gdbarch);
 228
 229   set_gdbarch_skip_trampoline_code (gdbarch, i386_cygwin_skip_trampoline_code);
 230
 231   set_gdbarch_skip_main_prologue (gdbarch, i386_skip_main_prologue);
 232
 233   tdep->struct_return = reg_struct_return;
 234
 235   tdep->gregset_reg_offset = i386_windows_gregset_reg_offset;
 236   tdep->gregset_num_regs = ARRAY_SIZE (i386_windows_gregset_reg_offset);
 237   tdep->sizeof_gregset = I386_WINDOWS_SIZEOF_GREGSET;
 238
 239   /* Core file support.  */
 240   set_gdbarch_regset_from_core_section
 241     (gdbarch, i386_windows_regset_from_core_section);
 242   set_gdbarch_core_xfer_shared_libraries
 243     (gdbarch, windows_core_xfer_shared_libraries);
 244   set_gdbarch_core_pid_to_str (gdbarch, i386_windows_core_pid_to_str);
 245
 246   set_gdbarch_auto_wide_charset (gdbarch, i386_cygwin_auto_wide_charset);
 247 }
 248
 249 static enum gdb_osabi
 250 i386_cygwin_osabi_sniffer (bfd *abfd)
 251 {
 252   char *target_name = bfd_get_target (abfd);
 253
 254   if (strcmp (target_name, "pei-i386") == 0)
 255     return GDB_OSABI_CYGWIN;
 256
 257   /* Cygwin uses elf core dumps.  Do not claim all ELF executables,
 258      check whether there is a .reg section of proper size.  */
 259   if (strcmp (target_name, "elf32-i386") == 0)
 260     {
 261       asection *section = bfd_get_section_by_name (abfd, ".reg");
 262       if (section
 263           && bfd_section_size (abfd, section) == I386_WINDOWS_SIZEOF_GREGSET)
 264         return GDB_OSABI_CYGWIN;
 265     }
 266
 267   return GDB_OSABI_UNKNOWN;
 268 }
 269
 270 /* Provide a prototype to silence -Wmissing-prototypes.  */
 271 void _initialize_i386_cygwin_tdep (void);
 272
 273 void
 274 _initialize_i386_cygwin_tdep (void)
 275 {
 276   gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_coff_flavour,
 277                                   i386_cygwin_osabi_sniffer);
 278
 279   /* Cygwin uses elf core dumps.  */
 280   gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_elf_flavour,
 281                                   i386_cygwin_osabi_sniffer);
 282
 283   gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_CYGWIN,
 284                           i386_cygwin_init_abi);
 285 }