gdb/i386-cygwin-tdep.c - gdb

Global variables defined

Data types defined

Functions defined

Macros defined

Source code

  1. /* Target-dependent code for Cygwin running on i386's, for GDB.

  3.    Copyright (C) 2003-2015 Free Software Foundation, Inc.

  5.    This file is part of GDB.

  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.

  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.

  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/>.  */

  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"

  30. /* Core file support.  */

  32. /* This vector maps GDB's idea of a register's number into an address
  33.    in the windows exception context vector.  */

  35. ‌static int i386_windows_gregset_reg_offset[] =
  36. {
  37.   176, /* eax */
  38.   172, /* ecx */
  39.   168, /* edx */
  40.   164, /* ebx */

  42.   196, /* esp */
  43.   180, /* ebp */
  44.   160, /* esi */
  45.   156, /* edi */

  47.   184, /* eip */
  48.   192, /* eflags */
  49.   188, /* cs */
  50.   200, /* ss */

  52.   152, /* ds */
  53.   148, /* es */
  54.   144, /* fs */
  55.   140, /* gs */

  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] */

  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 */

  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] */

  85.   /* MXCSR */
  86.   228 /* ExtendedRegisters[24] */
  87. };

  89. ‌#define I386_WINDOWS_SIZEOF_GREGSET 716

  91. ‌struct cpms_data
  92. {
  93.   struct gdbarch *gdbarch;
  94.   struct obstack *obstack;
  95.   int module_count;
  96. };

  98. static void
  99. ‌core_process_module_section (bfd *abfd, asection *sect, void *obj)
  100. {
  101.   struct cpms_data *data = obj;
  102.   enum bfd_endian byte_order = gdbarch_byte_order (data->gdbarch);

  104.   char *module_name;
  105.   size_t module_name_size;
  106.   CORE_ADDR base_addr;

  108.   gdb_byte *buf = NULL;

  110.   if (strncmp (sect->name, ".module", 7) != 0)
  111.     return;

  113.   buf = xmalloc (bfd_get_section_size (sect) + 1);
  114.   if (!buf)
  115.     {
  116.       printf_unfiltered ("memory allocation failed for %s\n", sect->name);
  117.       goto out;
  118.     }
  119.   if (!bfd_get_section_contents (abfd, sect,
  120.                                  buf, 0, bfd_get_section_size (sect)))
  121.     goto out;



  125.   /* A DWORD (data_type) followed by struct windows_core_module_info.  */

  127.   base_addr =
  128.     extract_unsigned_integer (buf + 4, 4, byte_order);

  130.   module_name_size =
  131.     extract_unsigned_integer (buf + 8, 4, byte_order);

  133.   if (12 + module_name_size > bfd_get_section_size (sect))
  134.     goto out;
  135.   module_name = (char *) buf + 12;

  137.   /* The first module is the .exe itself.  */
  138.   if (data->module_count != 0)
  139.     windows_xfer_shared_library (module_name, base_addr,
  140.                                  data->gdbarch, data->obstack);
  141.   data->module_count++;

  143. out:
  144.   if (buf)
  145.     xfree (buf);
  146.   return;
  147. }

  149. static ULONGEST
  150. ‌windows_core_xfer_shared_libraries (struct gdbarch *gdbarch,
  151.                                   gdb_byte *readbuf,
  152.                                   ULONGEST offset, ULONGEST len)
  153. {
  154.   struct obstack obstack;
  155.   const char *buf;
  156.   ULONGEST len_avail;
  157.   struct cpms_data data = { gdbarch, &obstack, 0 };

  159.   obstack_init (&obstack);
  160.   obstack_grow_str (&obstack, "<library-list>\n");
  161.   bfd_map_over_sections (core_bfd,
  162.                          core_process_module_section,
  163.                          &data);
  164.   obstack_grow_str0 (&obstack, "</library-list>\n");

  166.   buf = obstack_finish (&obstack);
  167.   len_avail = strlen (buf);
  168.   if (offset >= len_avail)
  169.     return 0;

  171.   if (len > len_avail - offset)
  172.     len = len_avail - offset;
  173.   memcpy (readbuf, buf + offset, len);

  175.   obstack_free (&obstack, NULL);
  176.   return len;
  177. }

  179. /* This is how we want PTIDs from core files to be printed.  */

  181. static char *
  182. ‌i386_windows_core_pid_to_str (struct gdbarch *gdbarch, ptid_t ptid)
  183. {
  184.   static char buf[80];

  186.   if (ptid_get_lwp (ptid) != 0)
  187.     {
  188.       snprintf (buf, sizeof (buf), "Thread 0x%lx", ptid_get_lwp (ptid));
  189.       return buf;
  190.     }

  192.   return normal_pid_to_str (ptid);
  193. }

  195. static CORE_ADDR
  196. ‌i386_cygwin_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
  197. {
  198.   return i386_pe_skip_trampoline_code (frame, pc, NULL);
  199. }

  201. static const char *
  202. ‌i386_cygwin_auto_wide_charset (void)
  203. {
  204.   return "UTF-16";
  205. }

  207. static void
  208. ‌i386_cygwin_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
  209. {
  210.   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

  212.   windows_init_abi (info, gdbarch);

  214.   set_gdbarch_skip_trampoline_code (gdbarch, i386_cygwin_skip_trampoline_code);

  216.   set_gdbarch_skip_main_prologue (gdbarch, i386_skip_main_prologue);

  218.   tdep->struct_return = reg_struct_return;

  220.   tdep->gregset_reg_offset = i386_windows_gregset_reg_offset;
  221.   tdep->gregset_num_regs = ARRAY_SIZE (i386_windows_gregset_reg_offset);
  222.   tdep->sizeof_gregset = I386_WINDOWS_SIZEOF_GREGSET;

  224.   tdep->sizeof_fpregset = 0;

  226.   /* Core file support.  */
  227.   set_gdbarch_core_xfer_shared_libraries
  228.     (gdbarch, windows_core_xfer_shared_libraries);
  229.   set_gdbarch_core_pid_to_str (gdbarch, i386_windows_core_pid_to_str);

  231.   set_gdbarch_auto_wide_charset (gdbarch, i386_cygwin_auto_wide_charset);
  232. }

  234. static enum gdb_osabi
  235. ‌i386_cygwin_osabi_sniffer (bfd *abfd)
  236. {
  237.   char *target_name = bfd_get_target (abfd);

  239.   if (strcmp (target_name, "pei-i386") == 0)
  240.     return GDB_OSABI_CYGWIN;

  242.   /* Cygwin uses elf core dumps.  Do not claim all ELF executables,
  243.      check whether there is a .reg section of proper size.  */
  244.   if (strcmp (target_name, "elf32-i386") == 0)
  245.     {
  246.       asection *section = bfd_get_section_by_name (abfd, ".reg");
  247.       if (section
  248.           && bfd_section_size (abfd, section) == I386_WINDOWS_SIZEOF_GREGSET)
  249.         return GDB_OSABI_CYGWIN;
  250.     }

  252.   return GDB_OSABI_UNKNOWN;
  253. }

  255. /* Provide a prototype to silence -Wmissing-prototypes.  */
  256. void _initialize_i386_cygwin_tdep (void);

  258. void
  259. ‌_initialize_i386_cygwin_tdep (void)
  260. {
  261.   gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_coff_flavour,
  262.                                   i386_cygwin_osabi_sniffer);

  264.   /* Cygwin uses elf core dumps.  */
  265.   gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_elf_flavour,
  266.                                   i386_cygwin_osabi_sniffer);

  268.   gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_CYGWIN,
  269.                           i386_cygwin_init_abi);
  270. }