gdb/arc-newlib-tdep.c

   1 /* Target-dependent code for Newlib ARC.
   2
   3    Copyright (C) 2016-2019 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 /* Local non-gdb includes.  */
  24 #include "arc-tdep.h"
  25 #include "gdbarch.h"
  26 #include "osabi.h"
  27
  28 /* Implement the 'init_osabi' method of struct gdb_osabi_handler.  */
  29
  30 static void
  31 arc_newlib_init_osabi (struct gdbarch_info info, struct gdbarch *gdbarch)
  32 {
  33   if (arc_debug)
  34     debug_printf ("arc-newlib: Initialization.\n");
  35
  36   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  37
  38   /* Offset of original PC in longjmp jump buffer (in registers).  Value of PC
  39      offset can be found in newlib/libc/machine/arc/setjmp.S.  */
  40   tdep->jb_pc = 18;
  41 }
  42
  43 /* Recognize ARC Newlib object files.  */
  44
  45 static enum gdb_osabi
  46 arc_newlib_osabi_sniffer (bfd *abfd)
  47 {
  48   if (arc_debug)
  49     debug_printf ("arc-newlib: OS/ABI sniffer.\n");
  50
  51   /* crt0.S in libgloss for ARC defines .ivt section for interrupt handlers.
  52      If this section is not present then this is likely not a newlib - could be
  53      a Linux application or some non-newlib baremetal application.  */
  54   if (bfd_get_section_by_name (abfd, ".ivt") != NULL)
  55     return GDB_OSABI_NEWLIB;
  56   else
  57     return GDB_OSABI_UNKNOWN;
  58 }
  59
  60 void
  61 _initialize_arc_newlib_tdep (void)
  62 {
  63   gdbarch_register_osabi_sniffer (bfd_arch_arc, bfd_target_elf_flavour,
  64                                   arc_newlib_osabi_sniffer);
  65   gdbarch_register_osabi (bfd_arch_arc, 0, GDB_OSABI_NEWLIB,
  66                           arc_newlib_init_osabi);
  67 }