mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-11-28 04:25:10 +08:00
132 lines
3.9 KiB
C
132 lines
3.9 KiB
C
/* ARM Symbian OS target support.
|
|
|
|
Copyright (C) 2008-2020 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 "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. */
|
|
|
|
static 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))
|
|
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)
|
|
{
|
|
/* Shared library handling. */
|
|
set_gdbarch_skip_trampoline_code (gdbarch, arm_symbian_skip_trampoline_code);
|
|
|
|
/* On this target, the toolchain outputs ELF files, with `sym' for
|
|
filename extension (e.g., `FOO.sym'); these are post-linker
|
|
processed into PE-ish DLLs (e.g., `FOO.dll'), and it's these that
|
|
are actually copied to and run on the target. Naturally, when
|
|
listing shared libraries, Symbian stubs report the DLL filenames.
|
|
Setting this makes it so that GDB automatically looks for the
|
|
corresponding ELF files on the host's filesystem. */
|
|
set_gdbarch_solib_symbols_extension (gdbarch, "sym");
|
|
|
|
/* Canonical paths on this target look like `c:\sys\bin\bar.dll',
|
|
for example. */
|
|
set_gdbarch_has_dos_based_file_system (gdbarch, 1);
|
|
|
|
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;
|
|
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 = (Elf_Internal_Phdr *) 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);
|
|
}
|