1 /* Target-dependent code for i386 BSD's.
2 Copyright 2001, 2002 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"
27 #include "gdb_string.h"
29 #include "i386-tdep.h"
31 /* Support for signal handlers. */
33 /* Return whether PC is in a BSD sigtramp routine. */
36 i386bsd_pc_in_sigtramp (CORE_ADDR pc
, char *name
)
38 struct gdbarch_tdep
*tdep
= gdbarch_tdep (current_gdbarch
);
40 return (pc
>= tdep
->sigtramp_start
&& pc
< tdep
->sigtramp_end
);
43 /* Assuming FRAME is for a BSD sigtramp routine, return the address of
44 the associated sigcontext structure.
46 Note: This function is used for Solaris 2 too, so don't make it
50 i386bsd_sigcontext_addr (struct frame_info
*frame
)
53 /* If this isn't the top frame, the next frame must be for the
54 signal handler itself. A pointer to the sigcontext structure
55 is passed as the third argument to the signal handler. */
56 return read_memory_unsigned_integer (frame
->next
->frame
+ 16, 4);
58 /* This is the top frame. We'll have to find the address of the
59 sigcontext structure by looking at the stack pointer. */
60 return read_memory_unsigned_integer (read_register (SP_REGNUM
) + 8, 4);
63 /* Return the start address of the sigtramp routine. */
66 i386bsd_sigtramp_start (CORE_ADDR pc
)
68 return gdbarch_tdep (current_gdbarch
)->sigtramp_start
;
71 /* Return the end address of the sigtramp routine. */
74 i386bsd_sigtramp_end (CORE_ADDR pc
)
76 return gdbarch_tdep (current_gdbarch
)->sigtramp_end
;
80 /* Support for shared libraries. */
82 /* Return non-zero if we are in a shared library trampoline code stub. */
85 i386bsd_aout_in_solib_call_trampoline (CORE_ADDR pc
, char *name
)
87 return (name
&& !strcmp (name
, "_DYNAMIC"));
90 /* Traditional BSD (4.3 BSD, still used for BSDI and 386BSD). */
92 /* From <machine/signal.h>. */
93 int i386bsd_sc_pc_offset
= 20;
94 int i386bsd_sc_sp_offset
= 8;
97 i386bsd_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
99 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
101 set_gdbarch_pc_in_sigtramp (gdbarch
, i386bsd_pc_in_sigtramp
);
103 /* Assume SunOS-style shared libraries. */
104 set_gdbarch_in_solib_call_trampoline (gdbarch
,
105 i386bsd_aout_in_solib_call_trampoline
);
107 tdep
->jb_pc_offset
= 0;
109 tdep
->sigtramp_start
= 0xfdbfdfc0;
110 tdep
->sigtramp_end
= 0xfdbfe000;
111 tdep
->sigcontext_addr
= i386bsd_sigcontext_addr
;
112 tdep
->sc_pc_offset
= i386bsd_sc_pc_offset
;
113 tdep
->sc_sp_offset
= i386bsd_sc_sp_offset
;
116 /* NetBSD 1.0 or later. */
118 CORE_ADDR i386nbsd_sigtramp_start
= 0xbfbfdf20;
119 CORE_ADDR i386nbsd_sigtramp_end
= 0xbfbfdff0;
121 /* From <machine/signal.h>. */
122 int i386nbsd_sc_pc_offset
= 44;
123 int i386nbsd_sc_sp_offset
= 56;
126 i386nbsd_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
128 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
130 /* Obviously NetBSD is BSD-based. */
131 i386bsd_init_abi (info
, gdbarch
);
133 /* NetBSD uses -freg-struct-return by default. */
134 tdep
->struct_return
= reg_struct_return
;
136 /* NetBSD uses a different memory layout. */
137 tdep
->sigtramp_start
= i386nbsd_sigtramp_start
;
138 tdep
->sigtramp_end
= i386nbsd_sigtramp_end
;
140 /* NetBSD has a `struct sigcontext' that's different from the
141 origional 4.3 BSD. */
142 tdep
->sc_pc_offset
= i386nbsd_sc_pc_offset
;
143 tdep
->sc_sp_offset
= i386nbsd_sc_sp_offset
;
148 i386nbsdelf_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
150 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
152 /* It's still NetBSD. */
153 i386nbsd_init_abi (info
, gdbarch
);
156 i386_elf_init_abi (info
, gdbarch
);
158 /* NetBSD ELF uses SVR4-style shared libraries. */
159 set_gdbarch_in_solib_call_trampoline (gdbarch
,
160 generic_in_solib_call_trampoline
);
162 /* NetBSD ELF uses -fpcc-struct-return by default. */
163 tdep
->struct_return
= pcc_struct_return
;
165 /* We support the SSE registers on NetBSD ELF. */
166 tdep
->num_xmm_regs
= I386_NUM_XREGS
- 1;
167 set_gdbarch_num_regs (gdbarch
, I386_NUM_GREGS
+ I386_NUM_FREGS
171 /* FreeBSD 3.0-RELEASE or later. */
173 CORE_ADDR i386fbsd_sigtramp_start
= 0xbfbfdf20;
174 CORE_ADDR i386fbsd_sigtramp_end
= 0xbfbfdff0;
177 i386fbsdaout_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
179 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
181 /* Obviously FreeBSD is BSD-based. */
182 i386bsd_init_abi (info
, gdbarch
);
184 /* FreeBSD uses -freg-struct-return by default. */
185 tdep
->struct_return
= reg_struct_return
;
187 /* FreeBSD uses a different memory layout. */
188 tdep
->sigtramp_start
= i386fbsd_sigtramp_start
;
189 tdep
->sigtramp_end
= i386fbsd_sigtramp_end
;
193 i386fbsd_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
195 /* It's almost identical to FreeBSD a.out. */
196 i386fbsdaout_init_abi (info
, gdbarch
);
198 /* Except that it uses ELF. */
199 i386_elf_init_abi (info
, gdbarch
);
201 /* FreeBSD ELF uses SVR4-style shared libraries. */
202 set_gdbarch_in_solib_call_trampoline (gdbarch
,
203 generic_in_solib_call_trampoline
);
206 /* FreeBSD 4.0-RELEASE or later. */
208 /* From <machine/signal.h>. */
209 int i386fbsd4_sc_pc_offset
= 76;
210 int i386fbsd4_sc_sp_offset
= 88;
213 i386fbsd4_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
215 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
217 /* Inherit stuff from older releases. We assume that FreeBSD
218 4.0-RELEASE always uses ELF. */
219 i386fbsd_init_abi (info
, gdbarch
);
221 /* FreeBSD 4.0 introduced a new `struct sigcontext'. */
222 tdep
->sc_pc_offset
= i386fbsd4_sc_pc_offset
;
223 tdep
->sc_sp_offset
= i386fbsd4_sc_sp_offset
;
227 static enum gdb_osabi
228 i386bsd_aout_osabi_sniffer (bfd
*abfd
)
230 if (strcmp (bfd_get_target (abfd
), "a.out-i386-netbsd") == 0)
231 return GDB_OSABI_NETBSD_AOUT
;
233 if (strcmp (bfd_get_target (abfd
), "a.out-i386-freebsd") == 0)
234 return GDB_OSABI_FREEBSD_AOUT
;
236 return GDB_OSABI_UNKNOWN
;
240 /* Provide a prototype to silence -Wmissing-prototypes. */
241 void _initialize_i386bsd_tdep (void);
244 _initialize_i386bsd_tdep (void)
246 gdbarch_register_osabi_sniffer (bfd_arch_i386
, bfd_target_aout_flavour
,
247 i386bsd_aout_osabi_sniffer
);
249 gdbarch_register_osabi (bfd_arch_i386
, GDB_OSABI_NETBSD_AOUT
,
251 gdbarch_register_osabi (bfd_arch_i386
, GDB_OSABI_NETBSD_ELF
,
252 i386nbsdelf_init_abi
);
253 gdbarch_register_osabi (bfd_arch_i386
, GDB_OSABI_FREEBSD_AOUT
,
254 i386fbsdaout_init_abi
);
255 gdbarch_register_osabi (bfd_arch_i386
, GDB_OSABI_FREEBSD_ELF
,