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/* 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);
}
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