| /* Copyright (C) 2016-2021 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 "objfiles.h" |
| #include "arm-tdep.h" |
| #include "osabi.h" |
| |
| /* The gdbarch_register_osabi handler for ARM PikeOS; it performs |
| the gdbarch initialization for that platform. */ |
| |
| static void |
| arm_pikeos_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| { |
| /* Single stepping. */ |
| set_gdbarch_software_single_step (gdbarch, arm_software_single_step); |
| } |
| |
| /* The ARM PikeOS OSABI sniffer (see gdbarch_register_osabi_sniffer). |
| Returns GDB_OSABI_PIKEOS if the given BFD is a PikeOS binary, |
| GDB_OSABI_UNKNOWN otherwise. */ |
| |
| static enum gdb_osabi |
| arm_pikeos_osabi_sniffer (bfd *abfd) |
| { |
| long number_of_symbols; |
| long i; |
| int pikeos_stack_found = 0; |
| int pikeos_stack_size_found = 0; |
| |
| /* The BFD target of PikeOS is really just standard elf, so we |
| cannot use it to detect this variant. The only common thing that |
| may be found in PikeOS modules are symbols _vm_stack/__p4_stack and |
| _vm_stack_size/__p4_stack_end. They are used to specify the stack |
| location and size; and defined by the default linker script. |
| |
| OS ABI sniffers are called before the minimal symtabs are |
| created. So inspect the symbol table using BFD. */ |
| |
| long storage_needed = bfd_get_symtab_upper_bound (abfd); |
| if (storage_needed <= 0) |
| return GDB_OSABI_UNKNOWN; |
| |
| gdb::unique_xmalloc_ptr<asymbol *> symbol_table |
| ((asymbol **) xmalloc (storage_needed)); |
| number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table.get ()); |
| |
| if (number_of_symbols <= 0) |
| return GDB_OSABI_UNKNOWN; |
| |
| for (i = 0; i < number_of_symbols; i++) |
| { |
| const char *name = bfd_asymbol_name (symbol_table.get ()[i]); |
| |
| if (strcmp (name, "_vm_stack") == 0 |
| || strcmp (name, "__p4_stack") == 0) |
| pikeos_stack_found = 1; |
| |
| if (strcmp (name, "_vm_stack_size") == 0 |
| || strcmp (name, "__p4_stack_end") == 0) |
| pikeos_stack_size_found = 1; |
| } |
| |
| if (pikeos_stack_found && pikeos_stack_size_found) |
| return GDB_OSABI_PIKEOS; |
| else |
| return GDB_OSABI_UNKNOWN; |
| } |
| |
| void _initialize_arm_pikeos_tdep (); |
| void |
| _initialize_arm_pikeos_tdep () |
| { |
| /* Register the sniffer for the PikeOS targets. */ |
| gdbarch_register_osabi_sniffer (bfd_arch_arm, bfd_target_elf_flavour, |
| arm_pikeos_osabi_sniffer); |
| gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_PIKEOS, |
| arm_pikeos_init_abi); |
| } |