Symbian config

	gdb/
	* arm-symbian-tdep.c: New.
	* configure.tgt (arm*-*-symbianelf*): New target.
	(*-*-symbianelf*): New OS.
	* osabi.c (gdb_osabi_names): Add Symbian.
	* defs.h (gdb_osabi): Add GDB_OSABI_SYMBIAN.
	* Makefile.in (ALL_TARGET_OBJS): Add arm-symbian-tdep.o.
	(ALLDEPFILES): Add arm-symbian-tdep.c.

1 files changed, 121 insertions, 0 deletions

diff --git a/gdb/arm-symbian-tdep.c b/gdb/arm-symbian-tdep.c
new file mode 100644
index 0000000..264c00f
--- /dev/null
+++ b/gdb/arm-symbian-tdep.c
@@ -0,0 +1,121 @@
+/* ARM Symbian OS target support.
+
+   Copyright (C) 2008, 2009, 2010
+   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 "frame.h"
+#include "objfiles.h"
+#include "osabi.h"
+#include "solib.h"
+#include "solib-target.h"
+#include "target.h"
+#include "elf-bfd.h"
+
+/* If PC is in a DLL import stub, return the address of the `real'
+   function belonging to the stub.  */
+
+CORE_ADDR
+arm_symbian_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
+{
+  struct gdbarch *gdbarch;
+  enum bfd_endian byte_order;
+  ULONGEST insn;
+  CORE_ADDR dest;
+  gdb_byte buf[4];
+
+  if (!in_plt_section (pc, NULL))
+    return 0;
+
+  if (target_read_memory (pc, buf, 4) != 0)
+    return 0;
+
+  gdbarch = get_frame_arch (frame);
+  byte_order = gdbarch_byte_order (gdbarch);
+
+  /* ldr pc, [pc, #-4].  */
+  insn = extract_unsigned_integer (buf, 4, byte_order);
+  if (insn != 0xe51ff004)
+    return 0;
+
+  if (target_read_memory (pc + 4, buf, 4) != 0)
+    return 0;
+
+  dest = extract_unsigned_integer (buf, 4, byte_order);
+  return gdbarch_addr_bits_remove (gdbarch, dest);
+}
+
+static void
+arm_symbian_init_abi (struct gdbarch_info info,
+		      struct gdbarch *gdbarch)
+{
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+  /* Shared library handling.  */
+  set_gdbarch_skip_trampoline_code (gdbarch, arm_symbian_skip_trampoline_code);
+
+  set_solib_ops (gdbarch, &solib_target_so_ops);
+}
+
+/* Recognize Symbian object files.  */
+
+static enum gdb_osabi
+arm_symbian_osabi_sniffer (bfd *abfd)
+{
+  Elf_Internal_Phdr *phdrs, **segments;
+  long phdrs_size;
+  int num_phdrs, i;
+
+  /* Symbian executables are always shared objects (ET_DYN).  */
+  if (elf_elfheader (abfd)->e_type == ET_EXEC)
+    return GDB_OSABI_UNKNOWN;
+
+  if (elf_elfheader (abfd)->e_ident[EI_OSABI] != ELFOSABI_NONE)
+    return GDB_OSABI_UNKNOWN;
+
+  /* Check for the ELF headers not being part of any PT_LOAD segment.
+     Symbian is the only GDB supported (or GNU binutils supported) ARM
+     target which uses a postlinker to flatten ELF files, dropping the
+     ELF dynamic info in the process.  */
+  phdrs_size = bfd_get_elf_phdr_upper_bound (abfd);
+  if (phdrs_size == -1)
+    return GDB_OSABI_UNKNOWN;
+
+  phdrs = alloca (phdrs_size);
+  num_phdrs = bfd_get_elf_phdrs (abfd, phdrs);
+  if (num_phdrs == -1)
+    return GDB_OSABI_UNKNOWN;
+
+  for (i = 0; i < num_phdrs; i++)
+    if (phdrs[i].p_type == PT_LOAD && phdrs[i].p_offset == 0)
+      return GDB_OSABI_UNKNOWN;
+
+  /* Looks like a Symbian binary.  */
+  return GDB_OSABI_SYMBIAN;
+}
+
+void
+_initialize_arm_symbian_tdep (void)
+{
+  gdbarch_register_osabi_sniffer (bfd_arch_arm,
+				  bfd_target_elf_flavour,
+				  arm_symbian_osabi_sniffer);
+
+  gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_SYMBIAN,
+			  arm_symbian_init_abi);
+}