1 /* Target-dependent code for i386 BSD's.
2 Copyright 2001, 2002, 2003 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
22 #include "arch-utils.h"
28 #include "gdb_string.h"
30 #include "i386-tdep.h"
32 /* Support for signal handlers. */
34 /* Return whether PC is in a BSD sigtramp routine. */
37 i386bsd_pc_in_sigtramp (CORE_ADDR pc
, char *name
)
39 struct gdbarch_tdep
*tdep
= gdbarch_tdep (current_gdbarch
);
41 return (pc
>= tdep
->sigtramp_start
&& pc
< tdep
->sigtramp_end
);
44 /* Assuming FRAME is for a BSD sigtramp routine, return the address of
45 the associated sigcontext structure.
47 Note: This function is used for Solaris 2 too, so don't make it
51 i386bsd_sigcontext_addr (struct frame_info
*frame
)
53 struct frame_info
*next_frame
= get_next_frame (frame
);
56 /* If this isn't the top frame, the next frame must be for the
57 signal handler itself. A pointer to the sigcontext structure
58 is passed as the third argument to the signal handler. */
59 return read_memory_unsigned_integer (get_frame_base (next_frame
) + 16, 4);
61 /* This is the top frame. We'll have to find the address of the
62 sigcontext structure by looking at the stack pointer. */
63 return read_memory_unsigned_integer (read_register (SP_REGNUM
) + 8, 4);
66 /* Return the start address of the sigtramp routine. */
69 i386bsd_sigtramp_start (CORE_ADDR pc
)
71 return gdbarch_tdep (current_gdbarch
)->sigtramp_start
;
74 /* Return the end address of the sigtramp routine. */
77 i386bsd_sigtramp_end (CORE_ADDR pc
)
79 return gdbarch_tdep (current_gdbarch
)->sigtramp_end
;
83 /* Support for shared libraries. */
85 /* Return non-zero if we are in a shared library trampoline code stub. */
88 i386bsd_aout_in_solib_call_trampoline (CORE_ADDR pc
, char *name
)
90 return (name
&& !strcmp (name
, "_DYNAMIC"));
93 /* Traditional BSD (4.3 BSD, still used for BSDI and 386BSD). */
95 /* From <machine/signal.h>. */
96 int i386bsd_sc_pc_offset
= 20;
97 int i386bsd_sc_sp_offset
= 8;
100 i386bsd_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
102 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
104 set_gdbarch_pc_in_sigtramp (gdbarch
, i386bsd_pc_in_sigtramp
);
106 /* Allow the recognition of sigtramps as a function named <sigtramp>. */
107 set_gdbarch_sigtramp_start (gdbarch
, i386bsd_sigtramp_start
);
108 set_gdbarch_sigtramp_end (gdbarch
, i386bsd_sigtramp_end
);
110 /* Assume SunOS-style shared libraries. */
111 set_gdbarch_in_solib_call_trampoline (gdbarch
,
112 i386bsd_aout_in_solib_call_trampoline
);
114 tdep
->jb_pc_offset
= 0;
116 tdep
->sigtramp_start
= 0xfdbfdfc0;
117 tdep
->sigtramp_end
= 0xfdbfe000;
118 tdep
->sigcontext_addr
= i386bsd_sigcontext_addr
;
119 tdep
->sc_pc_offset
= i386bsd_sc_pc_offset
;
120 tdep
->sc_sp_offset
= i386bsd_sc_sp_offset
;
123 /* FreeBSD 3.0-RELEASE or later. */
125 CORE_ADDR i386fbsd_sigtramp_start
= 0xbfbfdf20;
126 CORE_ADDR i386fbsd_sigtramp_end
= 0xbfbfdff0;
129 i386fbsdaout_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
131 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
133 /* Obviously FreeBSD is BSD-based. */
134 i386bsd_init_abi (info
, gdbarch
);
136 /* FreeBSD uses -freg-struct-return by default. */
137 tdep
->struct_return
= reg_struct_return
;
139 /* FreeBSD uses a different memory layout. */
140 tdep
->sigtramp_start
= i386fbsd_sigtramp_start
;
141 tdep
->sigtramp_end
= i386fbsd_sigtramp_end
;
145 i386fbsd_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
147 /* It's almost identical to FreeBSD a.out. */
148 i386fbsdaout_init_abi (info
, gdbarch
);
150 /* Except that it uses ELF. */
151 i386_elf_init_abi (info
, gdbarch
);
153 /* FreeBSD ELF uses SVR4-style shared libraries. */
154 set_gdbarch_in_solib_call_trampoline (gdbarch
,
155 generic_in_solib_call_trampoline
);
158 /* FreeBSD 4.0-RELEASE or later. */
160 /* From <machine/signal.h>. */
161 int i386fbsd4_sc_pc_offset
= 76;
162 int i386fbsd4_sc_sp_offset
= 88;
165 i386fbsd4_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
167 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
169 /* Inherit stuff from older releases. We assume that FreeBSD
170 4.0-RELEASE always uses ELF. */
171 i386fbsd_init_abi (info
, gdbarch
);
173 /* FreeBSD 4.0 introduced a new `struct sigcontext'. */
174 tdep
->sc_pc_offset
= i386fbsd4_sc_pc_offset
;
175 tdep
->sc_sp_offset
= i386fbsd4_sc_sp_offset
;
179 static enum gdb_osabi
180 i386bsd_aout_osabi_sniffer (bfd
*abfd
)
182 if (strcmp (bfd_get_target (abfd
), "a.out-i386-netbsd") == 0)
183 return GDB_OSABI_NETBSD_AOUT
;
185 if (strcmp (bfd_get_target (abfd
), "a.out-i386-freebsd") == 0)
186 return GDB_OSABI_FREEBSD_AOUT
;
188 return GDB_OSABI_UNKNOWN
;
192 /* Provide a prototype to silence -Wmissing-prototypes. */
193 void _initialize_i386bsd_tdep (void);
196 _initialize_i386bsd_tdep (void)
198 gdbarch_register_osabi_sniffer (bfd_arch_i386
, bfd_target_aout_flavour
,
199 i386bsd_aout_osabi_sniffer
);
201 gdbarch_register_osabi (bfd_arch_i386
, 0, GDB_OSABI_FREEBSD_AOUT
,
202 i386fbsdaout_init_abi
);
203 gdbarch_register_osabi (bfd_arch_i386
, 0, GDB_OSABI_FREEBSD_ELF
,