gdb/arc-newlib-tdep.c

   1 /* Target-dependent code for Newlib ARC.
   2
   3    Copyright (C) 2016-2021 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 /* Print an "arc-newlib" debug statement.  */
  28
  29 #define arc_newlib_debug_printf(fmt, ...) \
  30   debug_prefixed_printf_cond (arc_debug, "arc-newlib", fmt, ##__VA_ARGS__)
  31
  32 /* Implement the 'init_osabi' method of struct gdb_osabi_handler.  */
  33
  34 static void
  35 arc_newlib_init_osabi (struct gdbarch_info info, struct gdbarch *gdbarch)
  36 {
  37   arc_newlib_debug_printf ("Initialization.");
  38
  39   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  40
  41   /* Offset of original PC in longjmp jump buffer (in registers).  Value of PC
  42      offset can be found in newlib/libc/machine/arc/setjmp.S.  */
  43   tdep->jb_pc = 18;
  44 }
  45
  46 /* Recognize ARC Newlib object files.  */
  47
  48 static enum gdb_osabi
  49 arc_newlib_osabi_sniffer (bfd *abfd)
  50 {
  51   arc_newlib_debug_printf ("OS/ABI sniffer.");
  52
  53   /* crt0.S in libgloss for ARC defines .ivt section for interrupt handlers.
  54      If this section is not present then this is likely not a newlib - could be
  55      a Linux application or some non-newlib baremetal application.  */
  56   if (bfd_get_section_by_name (abfd, ".ivt") != NULL)
  57     return GDB_OSABI_NEWLIB;
  58   else
  59     return GDB_OSABI_UNKNOWN;
  60 }
  61
  62 void _initialize_arc_newlib_tdep ();
  63 void
  64 _initialize_arc_newlib_tdep ()
  65 {
  66   gdbarch_register_osabi_sniffer (bfd_arch_arc, bfd_target_elf_flavour,
  67                                   arc_newlib_osabi_sniffer);
  68   gdbarch_register_osabi (bfd_arch_arc, 0, GDB_OSABI_NEWLIB,
  69                           arc_newlib_init_osabi);
  70 }