gdb: rename i386-cygwin-tdep.c to i386-windows-tdep.c

Since this file contains things that apply not only to Cygwin binaries,
but also to non-Cygwin Windows binaries, I think it would make more
sense for it to be called i386-windows-tdep.c.  It is analogous to
amd64-windows-tdep.c, which we already have.

gdb/ChangeLog:

	* i386-cygwin-tdep.c: Rename to...
	* i386-windows-tdep.c: ... this.
	* Makefile.in (ALL_TARGET_OBS): Rename i386-cygwin-tdep.c to
	i386-windows-tdep.c.
	* configure.tgt: Likewise.

1 files changed, 274 insertions, 0 deletions

diff --git a/gdb/i386-windows-tdep.c b/gdb/i386-windows-tdep.c
new file mode 100644
index 0000000..b9a959d
--- /dev/null
+++ b/gdb/i386-windows-tdep.c
@@ -0,0 +1,274 @@
+/* Target-dependent code for Cygwin running on i386's, for GDB.
+
+   Copyright (C) 2003-2020 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include "defs.h"
+#include "osabi.h"
+#include "i386-tdep.h"
+#include "windows-tdep.h"
+#include "regset.h"
+#include "gdb_obstack.h"
+#include "xml-support.h"
+#include "gdbcore.h"
+#include "inferior.h"
+
+/* Core file support.  */
+
+/* This vector maps GDB's idea of a register's number into an address
+   in the windows exception context vector.  */
+
+static int i386_windows_gregset_reg_offset[] =
+{
+  176, /* eax */
+  172, /* ecx */
+  168, /* edx */
+  164, /* ebx */
+
+  196, /* esp */
+  180, /* ebp */
+  160, /* esi */
+  156, /* edi */
+
+  184, /* eip */
+  192, /* eflags */
+  188, /* cs */
+  200, /* ss */
+
+  152, /* ds */
+  148, /* es */
+  144, /* fs */
+  140, /* gs */
+
+  56, /* FloatSave.RegisterArea[0 * 10] */
+  66, /* FloatSave.RegisterArea[1 * 10] */
+  76, /* FloatSave.RegisterArea[2 * 10] */
+  86, /* FloatSave.RegisterArea[3 * 10] */
+  96, /* FloatSave.RegisterArea[4 * 10] */
+  106, /* FloatSave.RegisterArea[5 * 10] */
+  116, /* FloatSave.RegisterArea[6 * 10] */
+  126, /* FloatSave.RegisterArea[7 * 10] */
+
+  28, /* FloatSave.ControlWord */
+  32, /* FloatSave.StatusWord */
+  36, /* FloatSave.TagWord */
+  44, /* FloatSave.ErrorSelector */
+  40, /* FloatSave.ErrorOffset */
+  52, /* FloatSave.DataSelector */
+  48, /* FloatSave.DataOffset */
+  44, /* FloatSave.ErrorSelector */
+
+  /* XMM0-7 */
+  364, /* ExtendedRegisters[10*16] */
+  380, /* ExtendedRegisters[11*16] */
+  396, /* ExtendedRegisters[12*16] */
+  412, /* ExtendedRegisters[13*16] */
+  428, /* ExtendedRegisters[14*16] */
+  444, /* ExtendedRegisters[15*16] */
+  460, /* ExtendedRegisters[16*16] */
+  476, /* ExtendedRegisters[17*16] */
+
+  /* MXCSR */
+  228 /* ExtendedRegisters[24] */
+};
+
+#define I386_WINDOWS_SIZEOF_GREGSET 716
+
+struct cpms_data
+{
+  struct gdbarch *gdbarch;
+  struct obstack *obstack;
+  int module_count;
+};
+
+static void
+core_process_module_section (bfd *abfd, asection *sect, void *obj)
+{
+  struct cpms_data *data = (struct cpms_data *) obj;
+  enum bfd_endian byte_order = gdbarch_byte_order (data->gdbarch);
+
+  char *module_name;
+  size_t module_name_size;
+  CORE_ADDR base_addr;
+
+  gdb_byte *buf = NULL;
+
+  if (!startswith (sect->name, ".module"))
+    return;
+
+  buf = (gdb_byte *) xmalloc (bfd_section_size (sect) + 1);
+  if (!buf)
+    {
+      printf_unfiltered ("memory allocation failed for %s\n", sect->name);
+      goto out;
+    }
+  if (!bfd_get_section_contents (abfd, sect,
+				 buf, 0, bfd_section_size (sect)))
+    goto out;
+
+
+
+  /* A DWORD (data_type) followed by struct windows_core_module_info.  */
+
+  base_addr =
+    extract_unsigned_integer (buf + 4, 4, byte_order);
+
+  module_name_size =
+    extract_unsigned_integer (buf + 8, 4, byte_order);
+
+  if (12 + module_name_size > bfd_section_size (sect))
+    goto out;
+  module_name = (char *) buf + 12;
+
+  /* The first module is the .exe itself.  */
+  if (data->module_count != 0)
+    windows_xfer_shared_library (module_name, base_addr,
+				 NULL, data->gdbarch, data->obstack);
+  data->module_count++;
+
+out:
+  if (buf)
+    xfree (buf);
+  return;
+}
+
+static ULONGEST
+windows_core_xfer_shared_libraries (struct gdbarch *gdbarch,
+				  gdb_byte *readbuf,
+				  ULONGEST offset, ULONGEST len)
+{
+  struct obstack obstack;
+  const char *buf;
+  ULONGEST len_avail;
+  struct cpms_data data = { gdbarch, &obstack, 0 };
+
+  obstack_init (&obstack);
+  obstack_grow_str (&obstack, "<library-list>\n");
+  bfd_map_over_sections (core_bfd,
+			 core_process_module_section,
+			 &data);
+  obstack_grow_str0 (&obstack, "</library-list>\n");
+
+  buf = (const char *) obstack_finish (&obstack);
+  len_avail = strlen (buf);
+  if (offset >= len_avail)
+    return 0;
+
+  if (len > len_avail - offset)
+    len = len_avail - offset;
+  memcpy (readbuf, buf + offset, len);
+
+  obstack_free (&obstack, NULL);
+  return len;
+}
+
+/* This is how we want PTIDs from core files to be printed.  */
+
+static std::string
+i386_windows_core_pid_to_str (struct gdbarch *gdbarch, ptid_t ptid)
+{
+  if (ptid.lwp () != 0)
+    return string_printf ("Thread 0x%lx", ptid.lwp ());
+
+  return normal_pid_to_str (ptid);
+}
+
+static CORE_ADDR
+i386_cygwin_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
+{
+  return i386_pe_skip_trampoline_code (frame, pc, NULL);
+}
+
+static const char *
+i386_cygwin_auto_wide_charset (void)
+{
+  return "UTF-16";
+}
+
+static void
+i386_cygwin_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
+{
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+  windows_init_abi (info, gdbarch);
+
+  set_gdbarch_skip_trampoline_code (gdbarch, i386_cygwin_skip_trampoline_code);
+
+  set_gdbarch_skip_main_prologue (gdbarch, i386_skip_main_prologue);
+
+  tdep->struct_return = reg_struct_return;
+
+  tdep->gregset_reg_offset = i386_windows_gregset_reg_offset;
+  tdep->gregset_num_regs = ARRAY_SIZE (i386_windows_gregset_reg_offset);
+  tdep->sizeof_gregset = I386_WINDOWS_SIZEOF_GREGSET;
+
+  tdep->sizeof_fpregset = 0;
+
+  /* Core file support.  */
+  set_gdbarch_core_xfer_shared_libraries
+    (gdbarch, windows_core_xfer_shared_libraries);
+  set_gdbarch_core_pid_to_str (gdbarch, i386_windows_core_pid_to_str);
+
+  set_gdbarch_auto_wide_charset (gdbarch, i386_cygwin_auto_wide_charset);
+}
+
+static enum gdb_osabi
+i386_cygwin_osabi_sniffer (bfd *abfd)
+{
+  const char *target_name = bfd_get_target (abfd);
+
+  if (strcmp (target_name, "pei-i386") == 0)
+    return GDB_OSABI_WINDOWS;
+
+  return GDB_OSABI_UNKNOWN;
+}
+
+static enum gdb_osabi
+i386_cygwin_core_osabi_sniffer (bfd *abfd)
+{
+  const char *target_name = bfd_get_target (abfd);
+
+  /* Cygwin uses elf core dumps.  Do not claim all ELF executables,
+     check whether there is a .reg section of proper size.  */
+  if (strcmp (target_name, "elf32-i386") == 0)
+    {
+      asection *section = bfd_get_section_by_name (abfd, ".reg");
+      if (section != nullptr
+	  && bfd_section_size (section) == I386_WINDOWS_SIZEOF_GREGSET)
+	return GDB_OSABI_CYGWIN;
+    }
+
+  return GDB_OSABI_UNKNOWN;
+}
+
+void _initialize_i386_cygwin_tdep ();
+void
+_initialize_i386_cygwin_tdep ()
+{
+  gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_coff_flavour,
+                                  i386_cygwin_osabi_sniffer);
+
+  /* Cygwin uses elf core dumps.  */
+  gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_elf_flavour,
+                                  i386_cygwin_core_osabi_sniffer);
+
+  /* The Cygwin and Windows OS ABIs are currently equivalent.  */
+  gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_CYGWIN,
+                          i386_cygwin_init_abi);
+  gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_WINDOWS,
+                          i386_cygwin_init_abi);
+}