| 1 | /* Copyright (C) 2016-2019 Free Software Foundation, Inc. |
| 2 | |
| 3 | This file is part of GDB. |
| 4 | |
| 5 | This program is free software; you can redistribute it and/or modify |
| 6 | it under the terms of the GNU General Public License as published by |
| 7 | the Free Software Foundation; either version 3 of the License, or |
| 8 | (at your option) any later version. |
| 9 | |
| 10 | This program is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | GNU General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU General Public License |
| 16 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 17 | |
| 18 | #include "defs.h" |
| 19 | #include "objfiles.h" |
| 20 | #include "arm-tdep.h" |
| 21 | #include "osabi.h" |
| 22 | |
| 23 | /* The gdbarch_register_osabi handler for ARM PikeOS; it performs |
| 24 | the gdbarch initialization for that platform. */ |
| 25 | |
| 26 | static void |
| 27 | arm_pikeos_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 28 | { |
| 29 | /* Single stepping. */ |
| 30 | set_gdbarch_software_single_step (gdbarch, arm_software_single_step); |
| 31 | } |
| 32 | |
| 33 | /* The ARM PikeOS OSABI sniffer (see gdbarch_register_osabi_sniffer). |
| 34 | Returns GDB_OSABI_PIKEOS if the given BFD is a PikeOS binary, |
| 35 | GDB_OSABI_UNKNOWN otherwise. */ |
| 36 | |
| 37 | static enum gdb_osabi |
| 38 | arm_pikeos_osabi_sniffer (bfd *abfd) |
| 39 | { |
| 40 | long number_of_symbols; |
| 41 | long i; |
| 42 | int pikeos_stack_found = 0; |
| 43 | int pikeos_stack_size_found = 0; |
| 44 | |
| 45 | /* The BFD target of PikeOS is really just standard elf, so we |
| 46 | cannot use it to detect this variant. The only common thing that |
| 47 | may be found in PikeOS modules are symbols _vm_stack/__p4_stack and |
| 48 | _vm_stack_size/__p4_stack_end. They are used to specify the stack |
| 49 | location and size; and defined by the default linker script. |
| 50 | |
| 51 | OS ABI sniffers are called before the minimal symtabs are |
| 52 | created. So inspect the symbol table using BFD. */ |
| 53 | |
| 54 | long storage_needed = bfd_get_symtab_upper_bound (abfd); |
| 55 | if (storage_needed <= 0) |
| 56 | return GDB_OSABI_UNKNOWN; |
| 57 | |
| 58 | gdb::unique_xmalloc_ptr<asymbol *> symbol_table |
| 59 | ((asymbol **) xmalloc (storage_needed)); |
| 60 | number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table.get ()); |
| 61 | |
| 62 | if (number_of_symbols <= 0) |
| 63 | return GDB_OSABI_UNKNOWN; |
| 64 | |
| 65 | for (i = 0; i < number_of_symbols; i++) |
| 66 | { |
| 67 | const char *name = bfd_asymbol_name (symbol_table.get ()[i]); |
| 68 | |
| 69 | if (strcmp (name, "_vm_stack") == 0 |
| 70 | || strcmp (name, "__p4_stack") == 0) |
| 71 | pikeos_stack_found = 1; |
| 72 | |
| 73 | if (strcmp (name, "_vm_stack_size") == 0 |
| 74 | || strcmp (name, "__p4_stack_end") == 0) |
| 75 | pikeos_stack_size_found = 1; |
| 76 | } |
| 77 | |
| 78 | if (pikeos_stack_found && pikeos_stack_size_found) |
| 79 | return GDB_OSABI_PIKEOS; |
| 80 | else |
| 81 | return GDB_OSABI_UNKNOWN; |
| 82 | } |
| 83 | |
| 84 | void |
| 85 | _initialize_arm_pikeos_tdep (void) |
| 86 | { |
| 87 | /* Register the sniffer for the PikeOS targets. */ |
| 88 | gdbarch_register_osabi_sniffer (bfd_arch_arm, bfd_target_elf_flavour, |
| 89 | arm_pikeos_osabi_sniffer); |
| 90 | gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_PIKEOS, |
| 91 | arm_pikeos_init_abi); |
| 92 | } |