summaryrefslogtreecommitdiff
path: root/gdb/armobsd-tdep.c
blob: 53e3d1654ae54ec6134103289f489edb4251d32c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
/* Target-dependent code for OpenBSD/arm.

   Copyright (C) 2006, 2007 Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

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

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor,
   Boston, MA 02110-1301, USA.  */

#include "defs.h"
#include "osabi.h"
#include "trad-frame.h"
#include "tramp-frame.h"

#include "gdb_string.h"

#include "obsd-tdep.h"
#include "arm-tdep.h"
#include "solib-svr4.h"

/* Signal trampolines.  */

static void
armobsd_sigframe_init (const struct tramp_frame *self,
		       struct frame_info *next_frame,
		       struct trad_frame_cache *cache,
		       CORE_ADDR func)
{
  CORE_ADDR sp, sigcontext_addr, addr;
  int regnum;

  /* We find the appropriate instance of `struct sigcontext' at a
     fixed offset in the signal frame.  */
  sp = frame_unwind_register_signed (next_frame, ARM_SP_REGNUM);
  sigcontext_addr = sp + 16;

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

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

  trad_frame_set_id (cache, frame_id_build (sp, func));
}

static const struct tramp_frame armobsd_sigframe =
{
  SIGTRAMP_FRAME,
  4,
  {
    { 0xe28d0010, -1 },		/* add     r0, sp, #16 */
    { 0xef000067, -1 },		/* swi     SYS_sigreturn */
    { 0xef000001, -1 },		/* swi     SYS_exit */
    { 0xeafffffc, -1 },		/* b       . - 8 */
    { TRAMP_SENTINEL_INSN, -1 }
  },
  armobsd_sigframe_init
};


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

static void
armobsd_init_abi (struct gdbarch_info info,
		  struct gdbarch *gdbarch)
{
  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

  if (tdep->fp_model == ARM_FLOAT_AUTO)
    tdep->fp_model = ARM_FLOAT_SOFT_VFP;

  tramp_frame_prepend_unwinder (gdbarch, &armobsd_sigframe);

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

  tdep->jb_pc = 24;
  tdep->jb_elt_size = 4;

  set_gdbarch_regset_from_core_section
    (gdbarch, armbsd_regset_from_core_section);

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

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

  /* Breakpoints.  */
  switch (info.byte_order)
    {
    case BFD_ENDIAN_BIG:
      tdep->thumb_breakpoint = arm_obsd_thumb_be_breakpoint;
      tdep->thumb_breakpoint_size = sizeof (arm_obsd_thumb_be_breakpoint);
      break;

    case BFD_ENDIAN_LITTLE:
      tdep->thumb_breakpoint = arm_obsd_thumb_le_breakpoint;
      tdep->thumb_breakpoint_size = sizeof (arm_obsd_thumb_le_breakpoint);
      break;
    }
}


static enum gdb_osabi
armobsd_core_osabi_sniffer (bfd *abfd)
{
  if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
    return GDB_OSABI_OPENBSD_ELF;

  return GDB_OSABI_UNKNOWN;
}

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

  gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_OPENBSD_ELF,
			  armobsd_init_abi);
}