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 "i386-tdep.h"
29 /* Support for signal handlers. */
31 /* Return whether PC is in a BSD sigtramp routine. */
34 i386bsd_pc_in_sigtramp (CORE_ADDR pc
, char *name
)
36 struct gdbarch_tdep
*tdep
= gdbarch_tdep (current_gdbarch
);
38 return (pc
>= tdep
->sigtramp_start
&& pc
< tdep
->sigtramp_end
);
41 /* Assuming FRAME is for a BSD sigtramp routine, return the address of
42 the associated sigcontext structure.
44 Note: This function is used for Solaris 2 too, so don't make it
48 i386bsd_sigcontext_addr (struct frame_info
*frame
)
51 /* If this isn't the top frame, the next frame must be for the
52 signal handler itself. A pointer to the sigcontext structure
53 is passed as the third argument to the signal handler. */
54 return read_memory_unsigned_integer (frame
->next
->frame
+ 16, 4);
56 /* This is the top frame. We'll have to find the address of the
57 sigcontext structure by looking at the stack pointer. */
58 return read_memory_unsigned_integer (read_register (SP_REGNUM
) + 8, 4);
61 /* Return the start address of the sigtramp routine. */
64 i386bsd_sigtramp_start (CORE_ADDR pc
)
66 return gdbarch_tdep (current_gdbarch
)->sigtramp_start
;
69 /* Return the end address of the sigtramp routine. */
72 i386bsd_sigtramp_end (CORE_ADDR pc
)
74 return gdbarch_tdep (current_gdbarch
)->sigtramp_end
;
78 /* Support for shared libraries. */
80 /* Return non-zero if we are in a shared library trampoline code stub. */
83 i386bsd_aout_in_solib_call_trampoline (CORE_ADDR pc
, char *name
)
85 return (name
&& !strcmp (name
, "_DYNAMIC"));
88 /* Traditional BSD (4.3 BSD, still used for BSDI and 386BSD). */
90 /* From <machine/signal.h>. */
91 int i386bsd_sc_pc_offset
= 20;
92 int i386bsd_sc_sp_offset
= 8;
95 i386bsd_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
97 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
99 set_gdbarch_pc_in_sigtramp (gdbarch
, i386bsd_pc_in_sigtramp
);
101 /* Assume SunOS-style shared libraries. */
102 set_gdbarch_in_solib_call_trampoline (gdbarch
,
103 i386bsd_aout_in_solib_call_trampoline
);
105 tdep
->jb_pc_offset
= 0;
107 tdep
->sigtramp_start
= 0xfdbfdfc0;
108 tdep
->sigtramp_end
= 0xfdbfe000;
109 tdep
->sigcontext_addr
= i386bsd_sigcontext_addr
;
110 tdep
->sc_pc_offset
= i386bsd_sc_pc_offset
;
111 tdep
->sc_sp_offset
= i386bsd_sc_sp_offset
;
114 /* NetBSD 1.0 or later. */
116 CORE_ADDR i386nbsd_sigtramp_start
= 0xbfbfdf20;
117 CORE_ADDR i386nbsd_sigtramp_end
= 0xbfbfdff0;
119 /* From <machine/signal.h>. */
120 int i386nbsd_sc_pc_offset
= 44;
121 int i386nbsd_sc_sp_offset
= 56;
124 i386nbsd_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
126 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
128 /* Obviously NetBSD is BSD-based. */
129 i386bsd_init_abi (info
, gdbarch
);
131 /* NetBSD uses -freg-struct-return by default. */
132 tdep
->struct_return
= reg_struct_return
;
134 /* NetBSD uses a different memory layout. */
135 tdep
->sigtramp_start
= i386nbsd_sigtramp_start
;
136 tdep
->sigtramp_end
= i386nbsd_sigtramp_end
;
138 /* NetBSD has a `struct sigcontext' that's different from the
139 origional 4.3 BSD. */
140 tdep
->sc_pc_offset
= i386nbsd_sc_pc_offset
;
141 tdep
->sc_sp_offset
= i386nbsd_sc_sp_offset
;
146 i386nbsdelf_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
148 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
150 /* It's still NetBSD. */
151 i386nbsd_init_abi (info
, gdbarch
);
154 i386_elf_init_abi (info
, gdbarch
);
156 /* NetBSD ELF uses SVR4-style shared libraries. */
157 set_gdbarch_in_solib_call_trampoline (gdbarch
,
158 generic_in_solib_call_trampoline
);
160 /* NetBSD ELF uses -fpcc-struct-return by default. */
161 tdep
->struct_return
= pcc_struct_return
;
163 /* We support the SSE registers on NetBSD ELF. */
164 tdep
->num_xmm_regs
= I386_NUM_XREGS
- 1;
165 set_gdbarch_num_regs (gdbarch
, I386_NUM_GREGS
+ I386_NUM_FREGS
169 /* FreeBSD 3.0-RELEASE or later. */
171 CORE_ADDR i386fbsd_sigtramp_start
= 0xbfbfdf20;
172 CORE_ADDR i386fbsd_sigtramp_end
= 0xbfbfdff0;
175 i386fbsdaout_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
177 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
179 /* Obviously FreeBSD is BSD-based. */
180 i386bsd_init_abi (info
, gdbarch
);
182 /* FreeBSD uses -freg-struct-return by default. */
183 tdep
->struct_return
= reg_struct_return
;
185 /* FreeBSD uses a different memory layout. */
186 tdep
->sigtramp_start
= i386fbsd_sigtramp_start
;
187 tdep
->sigtramp_end
= i386fbsd_sigtramp_end
;
191 i386fbsd_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
193 /* It's almost identical to FreeBSD a.out. */
194 i386fbsdaout_init_abi (info
, gdbarch
);
196 /* Except that it uses ELF. */
197 i386_elf_init_abi (info
, gdbarch
);
199 /* FreeBSD ELF uses SVR4-style shared libraries. */
200 set_gdbarch_in_solib_call_trampoline (gdbarch
,
201 generic_in_solib_call_trampoline
);
204 /* FreeBSD 4.0-RELEASE or later. */
206 /* From <machine/signal.h>. */
207 int i386fbsd4_sc_pc_offset
= 76;
208 int i386fbsd4_sc_sp_offset
= 88;
211 i386fbsd4_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
213 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
215 /* Inherit stuff from older releases. We assume that FreeBSD
216 4.0-RELEASE always uses ELF. */
217 i386fbsd_init_abi (info
, gdbarch
);
219 /* FreeBSD 4.0 introduced a new `struct sigcontext'. */
220 tdep
->sc_pc_offset
= i386fbsd4_sc_pc_offset
;
221 tdep
->sc_sp_offset
= i386fbsd4_sc_sp_offset
;
225 static enum gdb_osabi
226 i386bsd_aout_osabi_sniffer (bfd
*abfd
)
228 if (strcmp (bfd_get_target (abfd
), "a.out-i386-netbsd") == 0)
229 return GDB_OSABI_NETBSD_AOUT
;
231 if (strcmp (bfd_get_target (abfd
), "a.out-i386-freebsd") == 0)
232 return GDB_OSABI_FREEBSD_AOUT
;
234 return GDB_OSABI_UNKNOWN
;
238 /* Provide a prototype to silence -Wmissing-prototypes. */
239 void _initialize_i386bsd_tdep (void);
242 _initialize_i386bsd_tdep (void)
244 gdbarch_register_osabi_sniffer (bfd_arch_i386
, bfd_target_aout_flavour
,
245 i386bsd_aout_osabi_sniffer
);
247 gdbarch_register_osabi (bfd_arch_i386
, GDB_OSABI_NETBSD_AOUT
,
249 gdbarch_register_osabi (bfd_arch_i386
, GDB_OSABI_NETBSD_ELF
,
250 i386nbsdelf_init_abi
);
251 gdbarch_register_osabi (bfd_arch_i386
, GDB_OSABI_FREEBSD_AOUT
,
252 i386fbsdaout_init_abi
);
253 gdbarch_register_osabi (bfd_arch_i386
, GDB_OSABI_FREEBSD_ELF
,