Commit | Line | Data |
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b7247919 | 1 | /* Target-dependent code for i386 BSD's. |
8201327c | 2 | Copyright 2001, 2002 Free Software Foundation, Inc. |
b7247919 MK |
3 | |
4 | This file is part of GDB. | |
5 | ||
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. | |
10 | ||
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. | |
15 | ||
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. */ | |
20 | ||
21 | #include "defs.h" | |
9c5045b5 | 22 | #include "arch-utils.h" |
b7247919 MK |
23 | #include "frame.h" |
24 | #include "gdbcore.h" | |
25 | #include "regcache.h" | |
26 | ||
ca39387d MK |
27 | #include "gdb_string.h" |
28 | ||
8201327c | 29 | #include "i386-tdep.h" |
b7247919 | 30 | |
8201327c | 31 | /* Support for signal handlers. */ |
b7247919 MK |
32 | |
33 | /* Return whether PC is in a BSD sigtramp routine. */ | |
34 | ||
8201327c MK |
35 | static int |
36 | i386bsd_pc_in_sigtramp (CORE_ADDR pc, char *name) | |
b7247919 | 37 | { |
8201327c | 38 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
b7247919 | 39 | |
8201327c MK |
40 | return (pc >= tdep->sigtramp_start && pc < tdep->sigtramp_end); |
41 | } | |
b7247919 MK |
42 | |
43 | /* Assuming FRAME is for a BSD sigtramp routine, return the address of | |
21d0e8a4 | 44 | the associated sigcontext structure. |
b7247919 | 45 | |
21d0e8a4 MK |
46 | Note: This function is used for Solaris 2 too, so don't make it |
47 | static. */ | |
48 | ||
49 | CORE_ADDR | |
b7247919 MK |
50 | i386bsd_sigcontext_addr (struct frame_info *frame) |
51 | { | |
52 | if (frame->next) | |
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); | |
57 | ||
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); | |
61 | } | |
62 | ||
8201327c MK |
63 | /* Return the start address of the sigtramp routine. */ |
64 | ||
65 | CORE_ADDR | |
66 | i386bsd_sigtramp_start (CORE_ADDR pc) | |
67 | { | |
68 | return gdbarch_tdep (current_gdbarch)->sigtramp_start; | |
69 | } | |
70 | ||
71 | /* Return the end address of the sigtramp routine. */ | |
72 | ||
73 | CORE_ADDR | |
74 | i386bsd_sigtramp_end (CORE_ADDR pc) | |
75 | { | |
76 | return gdbarch_tdep (current_gdbarch)->sigtramp_end; | |
77 | } | |
78 | \f | |
79 | ||
9c5045b5 MK |
80 | /* Support for shared libraries. */ |
81 | ||
82 | /* Return non-zero if we are in a shared library trampoline code stub. */ | |
83 | ||
84 | int | |
85 | i386bsd_aout_in_solib_call_trampoline (CORE_ADDR pc, char *name) | |
86 | { | |
87 | return (name && !strcmp (name, "_DYNAMIC")); | |
88 | } | |
89 | ||
8201327c MK |
90 | /* Traditional BSD (4.3 BSD, still used for BSDI and 386BSD). */ |
91 | ||
92 | /* From <machine/signal.h>. */ | |
93 | int i386bsd_sc_pc_offset = 20; | |
6bff26de | 94 | int i386bsd_sc_sp_offset = 8; |
8201327c | 95 | |
3cac699e | 96 | void |
8201327c MK |
97 | i386bsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
98 | { | |
99 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
100 | ||
101 | set_gdbarch_pc_in_sigtramp (gdbarch, i386bsd_pc_in_sigtramp); | |
102 | ||
4b218c18 MK |
103 | /* Allow the recognition of sigtramps as a function named <sigtramp>. */ |
104 | set_gdbarch_sigtramp_start (gdbarch, i386bsd_sigtramp_start); | |
105 | set_gdbarch_sigtramp_end (gdbarch, i386bsd_sigtramp_end); | |
106 | ||
9c5045b5 MK |
107 | /* Assume SunOS-style shared libraries. */ |
108 | set_gdbarch_in_solib_call_trampoline (gdbarch, | |
109 | i386bsd_aout_in_solib_call_trampoline); | |
110 | ||
8201327c MK |
111 | tdep->jb_pc_offset = 0; |
112 | ||
8201327c MK |
113 | tdep->sigtramp_start = 0xfdbfdfc0; |
114 | tdep->sigtramp_end = 0xfdbfe000; | |
21d0e8a4 | 115 | tdep->sigcontext_addr = i386bsd_sigcontext_addr; |
8201327c | 116 | tdep->sc_pc_offset = i386bsd_sc_pc_offset; |
6bff26de | 117 | tdep->sc_sp_offset = i386bsd_sc_sp_offset; |
8201327c MK |
118 | } |
119 | ||
8201327c MK |
120 | /* FreeBSD 3.0-RELEASE or later. */ |
121 | ||
122 | CORE_ADDR i386fbsd_sigtramp_start = 0xbfbfdf20; | |
123 | CORE_ADDR i386fbsd_sigtramp_end = 0xbfbfdff0; | |
124 | ||
125 | static void | |
126 | i386fbsdaout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
127 | { | |
128 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
129 | ||
130 | /* Obviously FreeBSD is BSD-based. */ | |
131 | i386bsd_init_abi (info, gdbarch); | |
132 | ||
133 | /* FreeBSD uses -freg-struct-return by default. */ | |
134 | tdep->struct_return = reg_struct_return; | |
135 | ||
136 | /* FreeBSD uses a different memory layout. */ | |
137 | tdep->sigtramp_start = i386fbsd_sigtramp_start; | |
138 | tdep->sigtramp_end = i386fbsd_sigtramp_end; | |
139 | } | |
140 | ||
141 | static void | |
142 | i386fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
143 | { | |
144 | /* It's almost identical to FreeBSD a.out. */ | |
145 | i386fbsdaout_init_abi (info, gdbarch); | |
146 | ||
147 | /* Except that it uses ELF. */ | |
148 | i386_elf_init_abi (info, gdbarch); | |
9c5045b5 MK |
149 | |
150 | /* FreeBSD ELF uses SVR4-style shared libraries. */ | |
151 | set_gdbarch_in_solib_call_trampoline (gdbarch, | |
152 | generic_in_solib_call_trampoline); | |
8201327c MK |
153 | } |
154 | ||
155 | /* FreeBSD 4.0-RELEASE or later. */ | |
156 | ||
157 | /* From <machine/signal.h>. */ | |
158 | int i386fbsd4_sc_pc_offset = 76; | |
6bff26de | 159 | int i386fbsd4_sc_sp_offset = 88; |
8201327c MK |
160 | |
161 | static void | |
162 | i386fbsd4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
163 | { | |
164 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
165 | ||
166 | /* Inherit stuff from older releases. We assume that FreeBSD | |
167 | 4.0-RELEASE always uses ELF. */ | |
168 | i386fbsd_init_abi (info, gdbarch); | |
169 | ||
170 | /* FreeBSD 4.0 introduced a new `struct sigcontext'. */ | |
171 | tdep->sc_pc_offset = i386fbsd4_sc_pc_offset; | |
6bff26de | 172 | tdep->sc_sp_offset = i386fbsd4_sc_sp_offset; |
8201327c MK |
173 | } |
174 | ||
175 | \f | |
176 | static enum gdb_osabi | |
177 | i386bsd_aout_osabi_sniffer (bfd *abfd) | |
178 | { | |
179 | if (strcmp (bfd_get_target (abfd), "a.out-i386-netbsd") == 0) | |
180 | return GDB_OSABI_NETBSD_AOUT; | |
181 | ||
182 | if (strcmp (bfd_get_target (abfd), "a.out-i386-freebsd") == 0) | |
183 | return GDB_OSABI_FREEBSD_AOUT; | |
184 | ||
185 | return GDB_OSABI_UNKNOWN; | |
186 | } | |
187 | ||
188 | \f | |
189 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
190 | void _initialize_i386bsd_tdep (void); | |
191 | ||
192 | void | |
193 | _initialize_i386bsd_tdep (void) | |
194 | { | |
195 | gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_aout_flavour, | |
196 | i386bsd_aout_osabi_sniffer); | |
197 | ||
8201327c MK |
198 | gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_FREEBSD_AOUT, |
199 | i386fbsdaout_init_abi); | |
200 | gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_FREEBSD_ELF, | |
201 | i386fbsd4_init_abi); | |
202 | } |