gdb/arc-newlib-tdep.c

   1 /* Target-dependent code for Newlib ARC.
   2
   3    Copyright (C) 2016-2017 Free Software Foundation, Inc.
   4    Contributed by Synopsys Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #include "defs.h"
  22
  23 #include "gdbarch.h"
  24 #include "arc-tdep.h"
  25 #include "osabi.h"
  26
  27 /* Implement the 'init_osabi' method of struct gdb_osabi_handler.  */
  28
  29 static void
  30 arc_newlib_init_osabi (struct gdbarch_info info, struct gdbarch *gdbarch)
  31 {
  32   if (arc_debug)
  33     debug_printf ("arc-newlib: Initialization.\n");
  34
  35   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  36
  37   /* Offset of original PC in longjmp jump buffer (in registers).  Value of PC
  38      offset can be found in newlib/libc/machine/arc/setjmp.S.  */
  39   tdep->jb_pc = 18;
  40 }
  41
  42 /* Recognize ARC Newlib object files.  */
  43
  44 static enum gdb_osabi
  45 arc_newlib_osabi_sniffer (bfd *abfd)
  46 {
  47   if (arc_debug)
  48     debug_printf ("arc-newlib: OS/ABI sniffer.\n");
  49
  50   /* crt0.S in libgloss for ARC defines .ivt section for interrupt handlers.
  51      If this section is not present then this is likely not a newlib - could be
  52      a Linux application or some non-newlib baremetal application.  */
  53   if (bfd_get_section_by_name (abfd, ".ivt") != NULL)
  54     return GDB_OSABI_NEWLIB;
  55   else
  56     return GDB_OSABI_UNKNOWN;
  57 }
  58
  59 /* Provide a prototype to silence -Wmissing-prototypes.  */
  60 extern initialize_file_ftype _initialize_arc_newlib_tdep;
  61
  62 void
  63 _initialize_arc_newlib_tdep (void)
  64 {
  65   gdbarch_register_osabi_sniffer (bfd_arch_arc, bfd_target_elf_flavour,
  66                                   arc_newlib_osabi_sniffer);
  67   gdbarch_register_osabi (bfd_arch_arc, 0, GDB_OSABI_NEWLIB,
  68                           arc_newlib_init_osabi);
  69 }