gdb/armobsd-tdep.c - gdb

Global variables defined

Functions defined

Source code

  1. /* Target-dependent code for OpenBSD/arm.

  3.    Copyright (C) 2006-2015 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 "osabi.h"
  22. #include "trad-frame.h"
  23. #include "tramp-frame.h"

  25. #include "obsd-tdep.h"
  26. #include "arm-tdep.h"
  27. #include "solib-svr4.h"

  29. /* Signal trampolines.  */

  31. static void
  32. ‌armobsd_sigframe_init (const struct tramp_frame *self,
  33.                        struct frame_info *this_frame,
  34.                        struct trad_frame_cache *cache,
  35.                        CORE_ADDR func)
  36. {
  37.   CORE_ADDR sp, sigcontext_addr, addr;
  38.   int regnum;

  40.   /* We find the appropriate instance of `struct sigcontext' at a
  41.      fixed offset in the signal frame.  */
  42.   sp = get_frame_register_signed (this_frame, ARM_SP_REGNUM);
  43.   sigcontext_addr = sp + 16;

  45.   /* PC.  */
  46.   trad_frame_set_reg_addr (cache, ARM_PC_REGNUM, sigcontext_addr + 76);

  48.   /* GPRs.  */
  49.   for (regnum = ARM_A1_REGNUM, addr = sigcontext_addr + 12;
  50.        regnum <= ARM_LR_REGNUM; regnum++, addr += 4)
  51.     trad_frame_set_reg_addr (cache, regnum, addr);

  53.   trad_frame_set_id (cache, frame_id_build (sp, func));
  54. }

  56. ‌static const struct tramp_frame armobsd_sigframe =
  57. {
  58.   SIGTRAMP_FRAME,
  59.   4,
  60.   {
  61.     { 0xe28d0010, -1 },                /* add     r0, sp, #16 */
  62.     { 0xef000067, -1 },                /* swi     SYS_sigreturn */
  63.     { 0xef000001, -1 },                /* swi     SYS_exit */
  64.     { 0xeafffffc, -1 },                /* b       . - 8 */
  65.     { TRAMP_SENTINEL_INSN, -1 }
  66.   },
  67.   armobsd_sigframe_init
  68. };


  71. /* Override default thumb breakpoints.  */
  72. ‌static const gdb_byte arm_obsd_thumb_le_breakpoint[] = {0xfe, 0xdf};
  73. ‌static const gdb_byte arm_obsd_thumb_be_breakpoint[] = {0xdf, 0xfe};

  75. static void
  76. ‌armobsd_init_abi (struct gdbarch_info info,
  77.                   struct gdbarch *gdbarch)
  78. {
  79.   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

  81.   if (tdep->fp_model == ARM_FLOAT_AUTO)
  82.     tdep->fp_model = ARM_FLOAT_SOFT_VFP;

  84.   tramp_frame_prepend_unwinder (gdbarch, &armobsd_sigframe);

  86.   /* OpenBSD/arm uses SVR4-style shared libraries.  */
  87.   set_solib_svr4_fetch_link_map_offsets
  88.     (gdbarch, svr4_ilp32_fetch_link_map_offsets);
  89.   set_gdbarch_skip_solib_resolver (gdbarch, obsd_skip_solib_resolver);

  91.   tdep->jb_pc = 24;
  92.   tdep->jb_elt_size = 4;

  94.   set_gdbarch_iterate_over_regset_sections
  95.     (gdbarch, armbsd_iterate_over_regset_sections);

  97.   /* OpenBSD/arm uses -fpcc-struct-return by default.  */
  98.   tdep->struct_return = pcc_struct_return;

  100.   /* Single stepping.  */
  101.   set_gdbarch_software_single_step (gdbarch, arm_software_single_step);

  103.   /* Breakpoints.  */
  104.   switch (info.byte_order)
  105.     {
  106.     case BFD_ENDIAN_BIG:
  107.       tdep->thumb_breakpoint = arm_obsd_thumb_be_breakpoint;
  108.       tdep->thumb_breakpoint_size = sizeof (arm_obsd_thumb_be_breakpoint);
  109.       break;

  111.     case BFD_ENDIAN_LITTLE:
  112.       tdep->thumb_breakpoint = arm_obsd_thumb_le_breakpoint;
  113.       tdep->thumb_breakpoint_size = sizeof (arm_obsd_thumb_le_breakpoint);
  114.       break;
  115.     }
  116. }


  119. static enum gdb_osabi
  120. ‌armobsd_core_osabi_sniffer (bfd *abfd)
  121. {
  122.   if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
  123.     return GDB_OSABI_OPENBSD_ELF;

  125.   return GDB_OSABI_UNKNOWN;
  126. }

  128. /* Provide a prototype to silence -Wmissing-prototypes.  */
  129. extern initialize_file_ftype _initialize_armobsd_tdep;

  131. void
  132. ‌_initialize_armobsd_tdep (void)
  133. {
  134.   /* BFD doesn't set a flavour for NetBSD style a.out core files.  */
  135.   gdbarch_register_osabi_sniffer (bfd_arch_arm, bfd_target_unknown_flavour,
  136.                                   armobsd_core_osabi_sniffer);

  138.   gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_OPENBSD_ELF,
  139.                           armobsd_init_abi);
  140. }