1 /* Target-dependent code for NetBSD/arm.
2
3 Copyright (C) 2002, 2003, 2004, 2006, 2007, 2008, 2009, 2010, 2011
4 Free Software Foundation, 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 #include "osabi.h"
23
24 #include "gdb_string.h"
25
26 #include "arm-tdep.h"
27 #include "solib-svr4.h"
28
29 /* Description of the longjmp buffer. */
30 #define ARM_NBSD_JB_PC 24
31 #define ARM_NBSD_JB_ELEMENT_SIZE INT_REGISTER_SIZE
32
33 /* For compatibility with previous implemenations of GDB on arm/NetBSD,
34 override the default little-endian breakpoint. */
35 static const char arm_nbsd_arm_le_breakpoint[] = {0x11, 0x00, 0x00, 0xe6};
36 static const char arm_nbsd_arm_be_breakpoint[] = {0xe6, 0x00, 0x00, 0x11};
37 static const char arm_nbsd_thumb_le_breakpoint[] = {0xfe, 0xde};
38 static const char arm_nbsd_thumb_be_breakpoint[] = {0xde, 0xfe};
39
40 static void
arm_netbsd_init_abi_common(struct gdbarch_info info,struct gdbarch * gdbarch)41 arm_netbsd_init_abi_common (struct gdbarch_info info,
42 struct gdbarch *gdbarch)
43 {
44 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
45
46 tdep->lowest_pc = 0x8000;
47 switch (info.byte_order)
48 {
49 case BFD_ENDIAN_LITTLE:
50 tdep->arm_breakpoint = arm_nbsd_arm_le_breakpoint;
51 tdep->thumb_breakpoint = arm_nbsd_thumb_le_breakpoint;
52 tdep->arm_breakpoint_size = sizeof (arm_nbsd_arm_le_breakpoint);
53 tdep->thumb_breakpoint_size = sizeof (arm_nbsd_thumb_le_breakpoint);
54 break;
55
56 case BFD_ENDIAN_BIG:
57 tdep->arm_breakpoint = arm_nbsd_arm_be_breakpoint;
58 tdep->thumb_breakpoint = arm_nbsd_thumb_be_breakpoint;
59 tdep->arm_breakpoint_size = sizeof (arm_nbsd_arm_be_breakpoint);
60 tdep->thumb_breakpoint_size = sizeof (arm_nbsd_thumb_be_breakpoint);
61 break;
62
63 default:
64 internal_error (__FILE__, __LINE__,
65 _("arm_gdbarch_init: bad byte order for float format"));
66 }
67
68 tdep->jb_pc = ARM_NBSD_JB_PC;
69 tdep->jb_elt_size = ARM_NBSD_JB_ELEMENT_SIZE;
70
71 /* Single stepping. */
72 set_gdbarch_software_single_step (gdbarch, arm_software_single_step);
73 }
74
75 static void
arm_netbsd_aout_init_abi(struct gdbarch_info info,struct gdbarch * gdbarch)76 arm_netbsd_aout_init_abi (struct gdbarch_info info,
77 struct gdbarch *gdbarch)
78 {
79 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
80
81 arm_netbsd_init_abi_common (info, gdbarch);
82 if (tdep->fp_model == ARM_FLOAT_AUTO)
83 tdep->fp_model = ARM_FLOAT_SOFT_FPA;
84 }
85
86 static void
arm_netbsd_elf_init_abi(struct gdbarch_info info,struct gdbarch * gdbarch)87 arm_netbsd_elf_init_abi (struct gdbarch_info info,
88 struct gdbarch *gdbarch)
89 {
90 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
91
92 arm_netbsd_init_abi_common (info, gdbarch);
93 if (tdep->fp_model == ARM_FLOAT_AUTO)
94 tdep->fp_model = ARM_FLOAT_SOFT_VFP;
95
96 /* NetBSD ELF uses SVR4-style shared libraries. */
97 set_solib_svr4_fetch_link_map_offsets
98 (gdbarch, svr4_ilp32_fetch_link_map_offsets);
99 }
100
101 static enum gdb_osabi
arm_netbsd_aout_osabi_sniffer(bfd * abfd)102 arm_netbsd_aout_osabi_sniffer (bfd *abfd)
103 {
104 if (strcmp (bfd_get_target (abfd), "a.out-arm-netbsd") == 0)
105 return GDB_OSABI_NETBSD_AOUT;
106
107 return GDB_OSABI_UNKNOWN;
108 }
109
110 /* Provide a prototype to silence -Wmissing-prototypes. */
111 extern initialize_file_ftype _initialize_arm_netbsd_tdep;
112
113 void
_initialize_arm_netbsd_tdep(void)114 _initialize_arm_netbsd_tdep (void)
115 {
116 gdbarch_register_osabi_sniffer (bfd_arch_arm, bfd_target_aout_flavour,
117 arm_netbsd_aout_osabi_sniffer);
118
119 gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_NETBSD_AOUT,
120 arm_netbsd_aout_init_abi);
121 gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_NETBSD_ELF,
122 arm_netbsd_elf_init_abi);
123 }
124