1 /* Target-dependent code for i386 BSD's.
3 Copyright (C) 2001-2021 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/>. */
21 #include "arch-utils.h"
27 #include "i386-tdep.h"
29 /* Support for signal handlers. */
31 /* Assuming THIS_FRAME is for a BSD sigtramp routine, return the
32 address of the associated sigcontext structure. */
35 i386bsd_sigcontext_addr (struct frame_info
*this_frame
)
37 struct gdbarch
*gdbarch
= get_frame_arch (this_frame
);
38 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
42 get_frame_register (this_frame
, I386_ESP_REGNUM
, buf
);
43 sp
= extract_unsigned_integer (buf
, 4, byte_order
);
45 return read_memory_unsigned_integer (sp
+ 8, 4, byte_order
);
49 /* Support for shared libraries. */
51 /* Traditional BSD (4.3 BSD, still used for BSDI and 386BSD). */
53 /* From <machine/signal.h>. */
54 int i386bsd_sc_reg_offset
[] =
65 8 + 4 * 4, /* %eflags */
75 i386bsd_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
77 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
79 tdep
->jb_pc_offset
= 0;
81 tdep
->sigtramp_start
= 0xfdbfdfc0;
82 tdep
->sigtramp_end
= 0xfdbfe000;
83 tdep
->sigcontext_addr
= i386bsd_sigcontext_addr
;
84 tdep
->sc_reg_offset
= i386bsd_sc_reg_offset
;
85 tdep
->sc_num_regs
= ARRAY_SIZE (i386bsd_sc_reg_offset
);