268 lines
7.1 KiB
C
268 lines
7.1 KiB
C
/* Target-dependent code for Cygwin running on i386's, for GDB.
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Copyright (C) 2003, 2007, 2008, 2009 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "osabi.h"
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#include "gdb_string.h"
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#include "i386-tdep.h"
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#include "windows-tdep.h"
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#include "regset.h"
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#include "gdb_obstack.h"
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#include "xml-support.h"
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#include "gdbcore.h"
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#include "solib.h"
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#include "solib-target.h"
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/* Core file support. */
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/* This vector maps GDB's idea of a register's number into an address
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in the windows exception context vector. */
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static int i386_windows_gregset_reg_offset[] =
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{
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176, /* eax */
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172, /* ecx */
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168, /* edx */
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164, /* ebx */
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196, /* esp */
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180, /* ebp */
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160, /* esi */
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156, /* edi */
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184, /* eip */
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192, /* eflags */
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188, /* cs */
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200, /* ss */
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152, /* ds */
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148, /* es */
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144, /* fs */
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140, /* gs */
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56, /* FloatSave.RegisterArea[0 * 10] */
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66, /* FloatSave.RegisterArea[1 * 10] */
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76, /* FloatSave.RegisterArea[2 * 10] */
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86, /* FloatSave.RegisterArea[3 * 10] */
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96, /* FloatSave.RegisterArea[4 * 10] */
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106, /* FloatSave.RegisterArea[5 * 10] */
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116, /* FloatSave.RegisterArea[6 * 10] */
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126, /* FloatSave.RegisterArea[7 * 10] */
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28, /* FloatSave.ControlWord */
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32, /* FloatSave.StatusWord */
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36, /* FloatSave.TagWord */
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44, /* FloatSave.ErrorSelector */
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40, /* FloatSave.ErrorOffset */
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52, /* FloatSave.DataSelector */
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48, /* FloatSave.DataOffset */
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44, /* FloatSave.ErrorSelector */
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/* XMM0-7 */
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364, /* ExtendedRegisters[10*16] */
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380, /* ExtendedRegisters[11*16] */
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396, /* ExtendedRegisters[12*16] */
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412, /* ExtendedRegisters[13*16] */
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428, /* ExtendedRegisters[14*16] */
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444, /* ExtendedRegisters[15*16] */
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460, /* ExtendedRegisters[16*16] */
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476, /* ExtendedRegisters[17*16] */
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/* MXCSR */
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228 /* ExtendedRegisters[24] */
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};
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#define I386_WINDOWS_SIZEOF_GREGSET 716
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/* Return the appropriate register set for the core section identified
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by SECT_NAME and SECT_SIZE. */
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static const struct regset *
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i386_windows_regset_from_core_section (struct gdbarch *gdbarch,
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const char *sect_name, size_t sect_size)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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if (strcmp (sect_name, ".reg") == 0
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&& sect_size == I386_WINDOWS_SIZEOF_GREGSET)
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{
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if (tdep->gregset == NULL)
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tdep->gregset = regset_alloc (gdbarch, i386_supply_gregset,
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i386_collect_gregset);
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return tdep->gregset;
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}
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return NULL;
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}
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struct cpms_data
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{
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struct obstack *obstack;
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int module_count;
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};
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static void
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core_process_module_section (bfd *abfd, asection *sect, void *obj)
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{
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struct cpms_data *data = obj;
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char *module_name;
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size_t module_name_size;
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CORE_ADDR base_addr;
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char *buf = NULL;
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if (strncmp (sect->name, ".module", 7) != 0)
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return;
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buf = xmalloc (bfd_get_section_size (sect) + 1);
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if (!buf)
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{
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printf_unfiltered ("memory allocation failed for %s\n", sect->name);
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goto out;
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}
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if (!bfd_get_section_contents (abfd, sect,
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buf, 0, bfd_get_section_size (sect)))
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goto out;
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/* A DWORD (data_type) followed by struct windows_core_module_info. */
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base_addr =
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extract_unsigned_integer (buf + 4, 4);
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module_name_size =
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extract_unsigned_integer (buf + 8, 4);
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module_name = buf + 12;
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if (module_name - buf + module_name_size > bfd_get_section_size (sect))
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goto out;
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/* The first module is the .exe itself. */
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if (data->module_count != 0)
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windows_xfer_shared_library (module_name, base_addr, data->obstack);
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data->module_count++;
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out:
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if (buf)
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xfree (buf);
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return;
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}
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static LONGEST
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windows_core_xfer_shared_libraries (struct gdbarch *gdbarch,
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gdb_byte *readbuf,
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ULONGEST offset, LONGEST len)
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{
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struct obstack obstack;
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const char *buf;
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LONGEST len_avail;
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struct cpms_data data = { &obstack, 0 };
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obstack_init (&obstack);
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obstack_grow_str (&obstack, "<library-list>\n");
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bfd_map_over_sections (core_bfd,
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core_process_module_section,
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&data);
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obstack_grow_str0 (&obstack, "</library-list>\n");
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buf = obstack_finish (&obstack);
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len_avail = strlen (buf);
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if (offset >= len_avail)
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return 0;
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if (len > len_avail - offset)
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len = len_avail - offset;
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memcpy (readbuf, buf + offset, len);
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obstack_free (&obstack, NULL);
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return len;
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}
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static CORE_ADDR
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i386_cygwin_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
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{
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return i386_pe_skip_trampoline_code (pc, NULL);
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}
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static void
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i386_cygwin_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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set_gdbarch_skip_trampoline_code (gdbarch, i386_cygwin_skip_trampoline_code);
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set_gdbarch_skip_main_prologue (gdbarch, i386_skip_main_prologue);
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tdep->struct_return = reg_struct_return;
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tdep->gregset_reg_offset = i386_windows_gregset_reg_offset;
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tdep->gregset_num_regs = ARRAY_SIZE (i386_windows_gregset_reg_offset);
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tdep->sizeof_gregset = I386_WINDOWS_SIZEOF_GREGSET;
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set_solib_ops (gdbarch, &solib_target_so_ops);
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/* Core file support. */
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set_gdbarch_regset_from_core_section
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(gdbarch, i386_windows_regset_from_core_section);
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set_gdbarch_core_xfer_shared_libraries
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(gdbarch, windows_core_xfer_shared_libraries);
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}
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static enum gdb_osabi
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i386_cygwin_osabi_sniffer (bfd *abfd)
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{
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char *target_name = bfd_get_target (abfd);
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/* Interix also uses pei-i386.
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We need a way to distinguish between the two. */
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if (strcmp (target_name, "pei-i386") == 0)
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return GDB_OSABI_CYGWIN;
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/* Cygwin uses elf core dumps. Do not claim all ELF executables,
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check whether there is a .reg section of proper size. */
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if (strcmp (target_name, "elf32-i386") == 0)
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{
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asection *section = bfd_get_section_by_name (abfd, ".reg");
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if (section
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&& bfd_section_size (abfd, section) == I386_WINDOWS_SIZEOF_GREGSET)
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return GDB_OSABI_CYGWIN;
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}
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return GDB_OSABI_UNKNOWN;
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}
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/* Provide a prototype to silence -Wmissing-prototypes. */
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void _initialize_i386_cygwin_tdep (void);
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void
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_initialize_i386_cygwin_tdep (void)
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{
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gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_coff_flavour,
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i386_cygwin_osabi_sniffer);
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/* Cygwin uses elf core dumps. */
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gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_elf_flavour,
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i386_cygwin_osabi_sniffer);
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gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_CYGWIN,
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i386_cygwin_init_abi);
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}
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