94 lines
3 KiB
C
94 lines
3 KiB
C
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/* Copyright (C) 2016-2022 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 "objfiles.h"
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#include "arm-tdep.h"
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#include "osabi.h"
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/* The gdbarch_register_osabi handler for ARM PikeOS; it performs
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the gdbarch initialization for that platform. */
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static void
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arm_pikeos_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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/* Single stepping. */
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set_gdbarch_software_single_step (gdbarch, arm_software_single_step);
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}
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/* The ARM PikeOS OSABI sniffer (see gdbarch_register_osabi_sniffer).
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Returns GDB_OSABI_PIKEOS if the given BFD is a PikeOS binary,
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GDB_OSABI_UNKNOWN otherwise. */
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static enum gdb_osabi
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arm_pikeos_osabi_sniffer (bfd *abfd)
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{
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long number_of_symbols;
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long i;
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int pikeos_stack_found = 0;
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int pikeos_stack_size_found = 0;
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/* The BFD target of PikeOS is really just standard elf, so we
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cannot use it to detect this variant. The only common thing that
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may be found in PikeOS modules are symbols _vm_stack/__p4_stack and
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_vm_stack_size/__p4_stack_end. They are used to specify the stack
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location and size; and defined by the default linker script.
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OS ABI sniffers are called before the minimal symtabs are
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created. So inspect the symbol table using BFD. */
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long storage_needed = bfd_get_symtab_upper_bound (abfd);
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if (storage_needed <= 0)
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return GDB_OSABI_UNKNOWN;
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gdb::unique_xmalloc_ptr<asymbol *> symbol_table
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((asymbol **) xmalloc (storage_needed));
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number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table.get ());
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if (number_of_symbols <= 0)
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return GDB_OSABI_UNKNOWN;
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for (i = 0; i < number_of_symbols; i++)
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{
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const char *name = bfd_asymbol_name (symbol_table.get ()[i]);
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if (strcmp (name, "_vm_stack") == 0
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|| strcmp (name, "__p4_stack") == 0)
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pikeos_stack_found = 1;
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if (strcmp (name, "_vm_stack_size") == 0
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|| strcmp (name, "__p4_stack_end") == 0)
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pikeos_stack_size_found = 1;
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}
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if (pikeos_stack_found && pikeos_stack_size_found)
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return GDB_OSABI_PIKEOS;
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else
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return GDB_OSABI_UNKNOWN;
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}
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void _initialize_arm_pikeos_tdep ();
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void
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_initialize_arm_pikeos_tdep ()
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{
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/* Register the sniffer for the PikeOS targets. */
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gdbarch_register_osabi_sniffer (bfd_arch_arm, bfd_target_elf_flavour,
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arm_pikeos_osabi_sniffer);
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gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_PIKEOS,
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arm_pikeos_init_abi);
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}
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