1 /* Target-dependent code for OpenBSD/arm.
3 Copyright (C) 2006-2024 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/>. */
22 #include "trad-frame.h"
23 #include "tramp-frame.h"
25 #include "obsd-tdep.h"
27 #include "solib-svr4.h"
29 /* Signal trampolines. */
32 armobsd_sigframe_init (const struct tramp_frame
*self
,
33 const frame_info_ptr
&this_frame
,
34 struct trad_frame_cache
*cache
,
37 CORE_ADDR sp
, sigcontext_addr
, addr
;
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;
46 trad_frame_set_reg_addr (cache
, ARM_PC_REGNUM
, sigcontext_addr
+ 76);
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
));
56 static const struct tramp_frame armobsd_sigframe
=
61 { 0xe28d0010, ULONGEST_MAX
}, /* add r0, sp, #16 */
62 { 0xef000067, ULONGEST_MAX
}, /* swi SYS_sigreturn */
63 { 0xef000001, ULONGEST_MAX
}, /* swi SYS_exit */
64 { 0xeafffffc, ULONGEST_MAX
}, /* b . - 8 */
65 { TRAMP_SENTINEL_INSN
, ULONGEST_MAX
}
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};
76 armobsd_init_abi (struct gdbarch_info info
,
77 struct gdbarch
*gdbarch
)
79 arm_gdbarch_tdep
*tdep
= gdbarch_tdep
<arm_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
);
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
);
104 switch (info
.byte_order
)
107 tdep
->thumb_breakpoint
= arm_obsd_thumb_be_breakpoint
;
108 tdep
->thumb_breakpoint_size
= sizeof (arm_obsd_thumb_be_breakpoint
);
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
);
118 void _initialize_armobsd_tdep ();
120 _initialize_armobsd_tdep ()
122 gdbarch_register_osabi (bfd_arch_arm
, 0, GDB_OSABI_OPENBSD
,