137 lines
4.1 KiB
C
137 lines
4.1 KiB
C
/* ARM Symbian OS target support.
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Copyright (C) 2008-2016 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 "frame.h"
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#include "objfiles.h"
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#include "osabi.h"
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#include "solib.h"
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#include "solib-target.h"
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#include "target.h"
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#include "elf-bfd.h"
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/* If PC is in a DLL import stub, return the address of the `real'
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function belonging to the stub. */
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static CORE_ADDR
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arm_symbian_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
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{
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struct gdbarch *gdbarch;
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enum bfd_endian byte_order;
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ULONGEST insn;
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CORE_ADDR dest;
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gdb_byte buf[4];
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if (!in_plt_section (pc))
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return 0;
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if (target_read_memory (pc, buf, 4) != 0)
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return 0;
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gdbarch = get_frame_arch (frame);
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byte_order = gdbarch_byte_order (gdbarch);
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/* ldr pc, [pc, #-4]. */
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insn = extract_unsigned_integer (buf, 4, byte_order);
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if (insn != 0xe51ff004)
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return 0;
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if (target_read_memory (pc + 4, buf, 4) != 0)
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return 0;
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dest = extract_unsigned_integer (buf, 4, byte_order);
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return gdbarch_addr_bits_remove (gdbarch, dest);
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}
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static void
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arm_symbian_init_abi (struct gdbarch_info info,
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struct gdbarch *gdbarch)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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/* Shared library handling. */
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set_gdbarch_skip_trampoline_code (gdbarch, arm_symbian_skip_trampoline_code);
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/* On this target, the toolchain outputs ELF files, with `sym' for
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filename extension (e.g., `FOO.sym'); these are post-linker
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processed into PE-ish DLLs (e.g., `FOO.dll'), and it's these that
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are actually copied to and run on the target. Naturally, when
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listing shared libraries, Symbian stubs report the DLL filenames.
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Setting this makes it so that GDB automatically looks for the
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corresponding ELF files on the host's filesystem. */
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set_gdbarch_solib_symbols_extension (gdbarch, "sym");
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/* Canonical paths on this target look like `c:\sys\bin\bar.dll',
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for example. */
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set_gdbarch_has_dos_based_file_system (gdbarch, 1);
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set_solib_ops (gdbarch, &solib_target_so_ops);
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}
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/* Recognize Symbian object files. */
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static enum gdb_osabi
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arm_symbian_osabi_sniffer (bfd *abfd)
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{
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Elf_Internal_Phdr *phdrs;
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long phdrs_size;
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int num_phdrs, i;
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/* Symbian executables are always shared objects (ET_DYN). */
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if (elf_elfheader (abfd)->e_type == ET_EXEC)
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return GDB_OSABI_UNKNOWN;
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if (elf_elfheader (abfd)->e_ident[EI_OSABI] != ELFOSABI_NONE)
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return GDB_OSABI_UNKNOWN;
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/* Check for the ELF headers not being part of any PT_LOAD segment.
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Symbian is the only GDB supported (or GNU binutils supported) ARM
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target which uses a postlinker to flatten ELF files, dropping the
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ELF dynamic info in the process. */
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phdrs_size = bfd_get_elf_phdr_upper_bound (abfd);
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if (phdrs_size == -1)
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return GDB_OSABI_UNKNOWN;
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phdrs = (Elf_Internal_Phdr *) alloca (phdrs_size);
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num_phdrs = bfd_get_elf_phdrs (abfd, phdrs);
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if (num_phdrs == -1)
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return GDB_OSABI_UNKNOWN;
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for (i = 0; i < num_phdrs; i++)
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if (phdrs[i].p_type == PT_LOAD && phdrs[i].p_offset == 0)
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return GDB_OSABI_UNKNOWN;
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/* Looks like a Symbian binary. */
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return GDB_OSABI_SYMBIAN;
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}
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/* -Wmissing-prototypes */
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extern initialize_file_ftype _initialize_arm_symbian_tdep;
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void
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_initialize_arm_symbian_tdep (void)
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{
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gdbarch_register_osabi_sniffer (bfd_arch_arm,
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bfd_target_elf_flavour,
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arm_symbian_osabi_sniffer);
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gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_SYMBIAN,
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arm_symbian_init_abi);
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}
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