gdb/alphafbsd-tdep.c - gdb

Global variables defined

Functions defined

Source code

  1. /* Target-dependent code for FreeBSD/alpha.

  3.    Copyright (C) 2001-2015 Free Software Foundation, Inc.

  5.    This file is part of GDB.

  7.    This program is free software; you can redistribute it and/or modify
  8.    it under the terms of the GNU General Public License as published by
  9.    the Free Software Foundation; either version 3 of the License, or
  10.    (at your option) any later version.

  12.    This program is distributed in the hope that it will be useful,
  13.    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15.    GNU General Public License for more details.

  17.    You should have received a copy of the GNU General Public License
  18.    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

  20. #include "defs.h"
  21. #include "value.h"
  22. #include "osabi.h"

  24. #include "alpha-tdep.h"
  25. #include "solib-svr4.h"

  27. static int
  28. ‌alphafbsd_return_in_memory (struct type *type)
  29. {
  30.   enum type_code code;
  31.   int i;

  33.   /* All aggregate types that won't fit in a register must be returned
  34.      in memory.  */
  35.   if (TYPE_LENGTH (type) > ALPHA_REGISTER_SIZE)
  36.     return 1;

  38.   /* The only aggregate types that can be returned in a register are
  39.      structs and unions.  Arrays must be returned in memory.  */
  40.   code = TYPE_CODE (type);
  41.   if (code != TYPE_CODE_STRUCT && code != TYPE_CODE_UNION)
  42.     return 1;

  44.   /* We need to check if this struct/union is "integer" like.  For
  45.      this to be true, the offset of each adressable subfield must be
  46.      zero.  Note that bit fields are not addressable.  */
  47.   for (i = 0; i < TYPE_NFIELDS (type); i++)
  48.     {
  49.       /* If the field bitsize is non-zero, it isn't adressable.  */
  50.       if (TYPE_FIELD_BITPOS (type, i) != 0
  51.           && TYPE_FIELD_BITSIZE (type, i) == 0)
  52.         return 1;
  53.     }

  55.   return 0;
  56. }


  59. /* Support for signal handlers.  */

  61. /* Return whether PC is in a BSD sigtramp routine.  */

  63. ‌CORE_ADDR alphafbsd_sigtramp_start = 0x11ffff68;
  64. ‌CORE_ADDR alphafbsd_sigtramp_end = 0x11ffffe0;

  66. static int
  67. ‌alphafbsd_pc_in_sigtramp (struct gdbarch *gdbarch,
  68.                           CORE_ADDR pc, const char *func_name)
  69. {
  70.   return (pc >= alphafbsd_sigtramp_start && pc < alphafbsd_sigtramp_end);
  71. }

  73. static LONGEST
  74. ‌alphafbsd_sigtramp_offset (struct gdbarch *gdbarch, CORE_ADDR pc)
  75. {
  76.   return pc - alphafbsd_sigtramp_start;
  77. }

  79. /* Assuming THIS_FRAME is the frame of a BSD sigtramp routine,
  80.    return the address of the associated sigcontext structure.  */

  82. static CORE_ADDR
  83. ‌alphafbsd_sigcontext_addr (struct frame_info *this_frame)
  84. {
  85.   return get_frame_register_unsigned (this_frame, ALPHA_SP_REGNUM) + 24;
  86. }

  88. /* FreeBSD 5.0-RELEASE or later.  */

  90. static void
  91. ‌alphafbsd_init_abi (struct gdbarch_info info,
  92.                     struct gdbarch *gdbarch)
  93. {
  94.   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

  96.   /* FIXME: Should activate generic FreeBSD support here with
  97.      fbsd_init_abi(), but this requires a valid
  98.      'iterate_over_regset_sections' gdbarch method and
  99.      'collect_regset' functions for each regset.  */

  101.   /* Hook into the DWARF CFI frame unwinder.  */
  102.   alpha_dwarf2_init_abi (info, gdbarch);

  104.   /* Hook into the MDEBUG frame unwinder.  */
  105.   alpha_mdebug_init_abi (info, gdbarch);

  107.   /* FreeBSD/alpha has SVR4-style shared libraries.  */
  108.   set_solib_svr4_fetch_link_map_offsets
  109.     (gdbarch, svr4_lp64_fetch_link_map_offsets);

  111.   tdep->dynamic_sigtramp_offset = alphafbsd_sigtramp_offset;
  112.   tdep->sigcontext_addr = alphafbsd_sigcontext_addr;
  113.   tdep->pc_in_sigtramp = alphafbsd_pc_in_sigtramp;
  114.   tdep->return_in_memory = alphafbsd_return_in_memory;
  115.   tdep->sc_pc_offset = 288;
  116.   tdep->sc_regs_offset = 24;
  117.   tdep->sc_fpregs_offset = 320;

  119.   tdep->jb_pc = 2;
  120.   tdep->jb_elt_size = 8;
  121. }


  124. /* Provide a prototype to silence -Wmissing-prototypes.  */
  125. void _initialize_alphafbsd_tdep (void);

  127. void
  128. ‌_initialize_alphafbsd_tdep (void)
  129. {
  130.   gdbarch_register_osabi (bfd_arch_alpha, 0, GDB_OSABI_FREEBSD_ELF,
  131.                           alphafbsd_init_abi);
  132. }