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
)
54 /* If this isn't the top frame, the next frame must be for the
55 signal handler itself. A pointer to the sigcontext structure
56 is passed as the third argument to the signal handler. */
57 return read_memory_unsigned_integer (frame
->next
->frame
+ 16, 4);
59 /* This is the top frame. We'll have to find the address of the
60 sigcontext structure by looking at the stack pointer. */
61 return read_memory_unsigned_integer (read_register (SP_REGNUM
) + 8, 4);
64 /* Return the start address of the sigtramp routine. */
67 i386bsd_sigtramp_start (CORE_ADDR pc
)
69 return gdbarch_tdep (current_gdbarch
)->sigtramp_start
;
72 /* Return the end address of the sigtramp routine. */
75 i386bsd_sigtramp_end (CORE_ADDR pc
)
77 return gdbarch_tdep (current_gdbarch
)->sigtramp_end
;
81 /* Support for shared libraries. */
83 /* Return non-zero if we are in a shared library trampoline code stub. */
86 i386bsd_aout_in_solib_call_trampoline (CORE_ADDR pc
, char *name
)
88 return (name
&& !strcmp (name
, "_DYNAMIC"));
91 /* Traditional BSD (4.3 BSD, still used for BSDI and 386BSD). */
93 /* From <machine/signal.h>. */
94 int i386bsd_sc_pc_offset
= 20;
95 int i386bsd_sc_sp_offset
= 8;
98 i386bsd_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
100 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
102 set_gdbarch_pc_in_sigtramp (gdbarch
, i386bsd_pc_in_sigtramp
);
104 /* Allow the recognition of sigtramps as a function named <sigtramp>. */
105 set_gdbarch_sigtramp_start (gdbarch
, i386bsd_sigtramp_start
);
106 set_gdbarch_sigtramp_end (gdbarch
, i386bsd_sigtramp_end
);
108 /* Assume SunOS-style shared libraries. */
109 set_gdbarch_in_solib_call_trampoline (gdbarch
,
110 i386bsd_aout_in_solib_call_trampoline
);
112 tdep
->jb_pc_offset
= 0;
114 tdep
->sigtramp_start
= 0xfdbfdfc0;
115 tdep
->sigtramp_end
= 0xfdbfe000;
116 tdep
->sigcontext_addr
= i386bsd_sigcontext_addr
;
117 tdep
->sc_pc_offset
= i386bsd_sc_pc_offset
;
118 tdep
->sc_sp_offset
= i386bsd_sc_sp_offset
;
121 /* FreeBSD 3.0-RELEASE or later. */
123 CORE_ADDR i386fbsd_sigtramp_start
= 0xbfbfdf20;
124 CORE_ADDR i386fbsd_sigtramp_end
= 0xbfbfdff0;
127 i386fbsdaout_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
129 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
131 /* Obviously FreeBSD is BSD-based. */
132 i386bsd_init_abi (info
, gdbarch
);
134 /* FreeBSD uses -freg-struct-return by default. */
135 tdep
->struct_return
= reg_struct_return
;
137 /* FreeBSD uses a different memory layout. */
138 tdep
->sigtramp_start
= i386fbsd_sigtramp_start
;
139 tdep
->sigtramp_end
= i386fbsd_sigtramp_end
;
143 i386fbsd_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
145 /* It's almost identical to FreeBSD a.out. */
146 i386fbsdaout_init_abi (info
, gdbarch
);
148 /* Except that it uses ELF. */
149 i386_elf_init_abi (info
, gdbarch
);
151 /* FreeBSD ELF uses SVR4-style shared libraries. */
152 set_gdbarch_in_solib_call_trampoline (gdbarch
,
153 generic_in_solib_call_trampoline
);
156 /* FreeBSD 4.0-RELEASE or later. */
158 /* From <machine/signal.h>. */
159 int i386fbsd4_sc_pc_offset
= 76;
160 int i386fbsd4_sc_sp_offset
= 88;
163 i386fbsd4_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
165 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
167 /* Inherit stuff from older releases. We assume that FreeBSD
168 4.0-RELEASE always uses ELF. */
169 i386fbsd_init_abi (info
, gdbarch
);
171 /* FreeBSD 4.0 introduced a new `struct sigcontext'. */
172 tdep
->sc_pc_offset
= i386fbsd4_sc_pc_offset
;
173 tdep
->sc_sp_offset
= i386fbsd4_sc_sp_offset
;
177 static enum gdb_osabi
178 i386bsd_aout_osabi_sniffer (bfd
*abfd
)
180 if (strcmp (bfd_get_target (abfd
), "a.out-i386-netbsd") == 0)
181 return GDB_OSABI_NETBSD_AOUT
;
183 if (strcmp (bfd_get_target (abfd
), "a.out-i386-freebsd") == 0)
184 return GDB_OSABI_FREEBSD_AOUT
;
186 return GDB_OSABI_UNKNOWN
;
190 /* Provide a prototype to silence -Wmissing-prototypes. */
191 void _initialize_i386bsd_tdep (void);
194 _initialize_i386bsd_tdep (void)
196 gdbarch_register_osabi_sniffer (bfd_arch_i386
, bfd_target_aout_flavour
,
197 i386bsd_aout_osabi_sniffer
);
199 gdbarch_register_osabi (bfd_arch_i386
, 0, GDB_OSABI_FREEBSD_AOUT
,
200 i386fbsdaout_init_abi
);
201 gdbarch_register_osabi (bfd_arch_i386
, 0, GDB_OSABI_FREEBSD_ELF
,