1 /* Target-dependent code for OpenBSD/arm.
3 Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011
4 Free Software Foundation, Inc.
6 This file is part of GDB.
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.
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.
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/>. */
23 #include "trad-frame.h"
24 #include "tramp-frame.h"
26 #include "gdb_string.h"
28 #include "obsd-tdep.h"
30 #include "solib-svr4.h"
32 /* Signal trampolines. */
35 armobsd_sigframe_init (const struct tramp_frame
*self
,
36 struct frame_info
*this_frame
,
37 struct trad_frame_cache
*cache
,
40 CORE_ADDR sp
, sigcontext_addr
, addr
;
43 /* We find the appropriate instance of `struct sigcontext' at a
44 fixed offset in the signal frame. */
45 sp
= get_frame_register_signed (this_frame
, ARM_SP_REGNUM
);
46 sigcontext_addr
= sp
+ 16;
49 trad_frame_set_reg_addr (cache
, ARM_PC_REGNUM
, sigcontext_addr
+ 76);
52 for (regnum
= ARM_A1_REGNUM
, addr
= sigcontext_addr
+ 12;
53 regnum
<= ARM_LR_REGNUM
; regnum
++, addr
+= 4)
54 trad_frame_set_reg_addr (cache
, regnum
, addr
);
56 trad_frame_set_id (cache
, frame_id_build (sp
, func
));
59 static const struct tramp_frame armobsd_sigframe
=
64 { 0xe28d0010, -1 }, /* add r0, sp, #16 */
65 { 0xef000067, -1 }, /* swi SYS_sigreturn */
66 { 0xef000001, -1 }, /* swi SYS_exit */
67 { 0xeafffffc, -1 }, /* b . - 8 */
68 { TRAMP_SENTINEL_INSN
, -1 }
74 /* Override default thumb breakpoints. */
75 static const char arm_obsd_thumb_le_breakpoint
[] = {0xfe, 0xdf};
76 static const char arm_obsd_thumb_be_breakpoint
[] = {0xdf, 0xfe};
79 armobsd_init_abi (struct gdbarch_info info
,
80 struct gdbarch
*gdbarch
)
82 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
84 if (tdep
->fp_model
== ARM_FLOAT_AUTO
)
85 tdep
->fp_model
= ARM_FLOAT_SOFT_VFP
;
87 tramp_frame_prepend_unwinder (gdbarch
, &armobsd_sigframe
);
89 /* OpenBSD/arm uses SVR4-style shared libraries. */
90 set_solib_svr4_fetch_link_map_offsets
91 (gdbarch
, svr4_ilp32_fetch_link_map_offsets
);
92 set_gdbarch_skip_solib_resolver (gdbarch
, obsd_skip_solib_resolver
);
95 tdep
->jb_elt_size
= 4;
97 set_gdbarch_regset_from_core_section
98 (gdbarch
, armbsd_regset_from_core_section
);
100 /* OpenBSD/arm uses -fpcc-struct-return by default. */
101 tdep
->struct_return
= pcc_struct_return
;
103 /* Single stepping. */
104 set_gdbarch_software_single_step (gdbarch
, arm_software_single_step
);
107 switch (info
.byte_order
)
110 tdep
->thumb_breakpoint
= arm_obsd_thumb_be_breakpoint
;
111 tdep
->thumb_breakpoint_size
= sizeof (arm_obsd_thumb_be_breakpoint
);
114 case BFD_ENDIAN_LITTLE
:
115 tdep
->thumb_breakpoint
= arm_obsd_thumb_le_breakpoint
;
116 tdep
->thumb_breakpoint_size
= sizeof (arm_obsd_thumb_le_breakpoint
);
122 static enum gdb_osabi
123 armobsd_core_osabi_sniffer (bfd
*abfd
)
125 if (strcmp (bfd_get_target (abfd
), "netbsd-core") == 0)
126 return GDB_OSABI_OPENBSD_ELF
;
128 return GDB_OSABI_UNKNOWN
;
131 /* Provide a prototype to silence -Wmissing-prototypes. */
132 extern initialize_file_ftype _initialize_armobsd_tdep
;
135 _initialize_armobsd_tdep (void)
137 /* BFD doesn't set a flavour for NetBSD style a.out core files. */
138 gdbarch_register_osabi_sniffer (bfd_arch_arm
, bfd_target_unknown_flavour
,
139 armobsd_core_osabi_sniffer
);
141 gdbarch_register_osabi (bfd_arch_arm
, 0, GDB_OSABI_OPENBSD_ELF
,