Commit | Line | Data |
---|---|---|
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 | ||
8201327c | 27 | #include "i386-tdep.h" |
b7247919 | 28 | |
8201327c | 29 | /* Support for signal handlers. */ |
b7247919 MK |
30 | |
31 | /* Return whether PC is in a BSD sigtramp routine. */ | |
32 | ||
8201327c MK |
33 | static int |
34 | i386bsd_pc_in_sigtramp (CORE_ADDR pc, char *name) | |
b7247919 | 35 | { |
8201327c | 36 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
b7247919 | 37 | |
8201327c MK |
38 | return (pc >= tdep->sigtramp_start && pc < tdep->sigtramp_end); |
39 | } | |
b7247919 MK |
40 | |
41 | /* Assuming FRAME is for a BSD sigtramp routine, return the address of | |
42 | the associated sigcontext structure. */ | |
43 | ||
44 | static CORE_ADDR | |
45 | i386bsd_sigcontext_addr (struct frame_info *frame) | |
46 | { | |
47 | if (frame->next) | |
48 | /* If this isn't the top frame, the next frame must be for the | |
49 | signal handler itself. A pointer to the sigcontext structure | |
50 | is passed as the third argument to the signal handler. */ | |
51 | return read_memory_unsigned_integer (frame->next->frame + 16, 4); | |
52 | ||
53 | /* This is the top frame. We'll have to find the address of the | |
54 | sigcontext structure by looking at the stack pointer. */ | |
55 | return read_memory_unsigned_integer (read_register (SP_REGNUM) + 8, 4); | |
56 | } | |
57 | ||
58 | /* Assuming FRAME is for a BSD sigtramp routine, return the saved | |
8201327c | 59 | program counter. |
b7247919 | 60 | |
8201327c MK |
61 | Note: This function is used for Solaris 2 too, so don't make it |
62 | static. */ | |
63 | ||
64 | CORE_ADDR | |
b7247919 MK |
65 | i386bsd_sigtramp_saved_pc (struct frame_info *frame) |
66 | { | |
8201327c | 67 | int sc_pc_offset = gdbarch_tdep (current_gdbarch)->sc_pc_offset; |
b7247919 | 68 | CORE_ADDR addr; |
8201327c | 69 | |
b7247919 | 70 | addr = i386bsd_sigcontext_addr (frame); |
8201327c | 71 | return read_memory_unsigned_integer (addr + sc_pc_offset, 4); |
b7247919 MK |
72 | } |
73 | ||
8201327c MK |
74 | /* Return the start address of the sigtramp routine. */ |
75 | ||
76 | CORE_ADDR | |
77 | i386bsd_sigtramp_start (CORE_ADDR pc) | |
78 | { | |
79 | return gdbarch_tdep (current_gdbarch)->sigtramp_start; | |
80 | } | |
81 | ||
82 | /* Return the end address of the sigtramp routine. */ | |
83 | ||
84 | CORE_ADDR | |
85 | i386bsd_sigtramp_end (CORE_ADDR pc) | |
86 | { | |
87 | return gdbarch_tdep (current_gdbarch)->sigtramp_end; | |
88 | } | |
89 | \f | |
90 | ||
9c5045b5 MK |
91 | /* Support for shared libraries. */ |
92 | ||
93 | /* Return non-zero if we are in a shared library trampoline code stub. */ | |
94 | ||
95 | int | |
96 | i386bsd_aout_in_solib_call_trampoline (CORE_ADDR pc, char *name) | |
97 | { | |
98 | return (name && !strcmp (name, "_DYNAMIC")); | |
99 | } | |
100 | ||
8201327c MK |
101 | /* Traditional BSD (4.3 BSD, still used for BSDI and 386BSD). */ |
102 | ||
103 | /* From <machine/signal.h>. */ | |
104 | int i386bsd_sc_pc_offset = 20; | |
105 | ||
106 | static void | |
107 | i386bsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
108 | { | |
109 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
110 | ||
111 | set_gdbarch_pc_in_sigtramp (gdbarch, i386bsd_pc_in_sigtramp); | |
112 | ||
9c5045b5 MK |
113 | /* Assume SunOS-style shared libraries. */ |
114 | set_gdbarch_in_solib_call_trampoline (gdbarch, | |
115 | i386bsd_aout_in_solib_call_trampoline); | |
116 | ||
8201327c MK |
117 | tdep->jb_pc_offset = 0; |
118 | ||
119 | tdep->sigtramp_saved_pc = i386bsd_sigtramp_saved_pc; | |
120 | tdep->sigtramp_start = 0xfdbfdfc0; | |
121 | tdep->sigtramp_end = 0xfdbfe000; | |
122 | tdep->sc_pc_offset = i386bsd_sc_pc_offset; | |
123 | } | |
124 | ||
125 | /* NetBSD 1.0 or later. */ | |
126 | ||
127 | /* From <machine/signal.h>. */ | |
128 | int i386nbsd_sc_pc_offset = 44; | |
129 | ||
130 | static void | |
131 | i386nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
132 | { | |
133 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
134 | ||
135 | /* Obviously NetBSD is BSD-based. */ | |
136 | i386bsd_init_abi (info, gdbarch); | |
137 | ||
138 | /* NetBSD uses -freg-struct-return by default. */ | |
139 | tdep->struct_return = reg_struct_return; | |
140 | ||
141 | /* NetBSD uses a different memory layout. */ | |
142 | tdep->sigtramp_start = 0xbfbfdf20; | |
143 | tdep->sigtramp_end = 0xbfbfdff0; | |
144 | ||
145 | /* NetBSD has a `struct sigcontext' that's different from the | |
146 | origional 4.3 BSD. */ | |
147 | tdep->sc_pc_offset = i386nbsd_sc_pc_offset; | |
148 | } | |
149 | ||
150 | /* NetBSD ELF. */ | |
151 | static void | |
152 | i386nbsdelf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
153 | { | |
154 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
155 | ||
156 | /* It's still NetBSD. */ | |
157 | i386nbsd_init_abi (info, gdbarch); | |
158 | ||
159 | /* But ELF-based. */ | |
160 | i386_elf_init_abi (info, gdbarch); | |
161 | ||
9c5045b5 MK |
162 | /* NetBSD ELF uses SVR4-style shared libraries. */ |
163 | set_gdbarch_in_solib_call_trampoline (gdbarch, | |
164 | generic_in_solib_call_trampoline); | |
165 | ||
8201327c MK |
166 | /* NetBSD ELF uses -fpcc-struct-return by default. */ |
167 | tdep->struct_return = pcc_struct_return; | |
168 | ||
169 | /* We support the SSE registers on NetBSD ELF. */ | |
170 | tdep->num_xmm_regs = I386_NUM_XREGS - 1; | |
171 | set_gdbarch_num_regs (gdbarch, I386_NUM_GREGS + I386_NUM_FREGS | |
172 | + I386_NUM_XREGS); | |
173 | } | |
174 | ||
175 | /* FreeBSD 3.0-RELEASE or later. */ | |
176 | ||
177 | CORE_ADDR i386fbsd_sigtramp_start = 0xbfbfdf20; | |
178 | CORE_ADDR i386fbsd_sigtramp_end = 0xbfbfdff0; | |
179 | ||
180 | static void | |
181 | i386fbsdaout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
182 | { | |
183 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
184 | ||
185 | /* Obviously FreeBSD is BSD-based. */ | |
186 | i386bsd_init_abi (info, gdbarch); | |
187 | ||
188 | /* FreeBSD uses -freg-struct-return by default. */ | |
189 | tdep->struct_return = reg_struct_return; | |
190 | ||
191 | /* FreeBSD uses a different memory layout. */ | |
192 | tdep->sigtramp_start = i386fbsd_sigtramp_start; | |
193 | tdep->sigtramp_end = i386fbsd_sigtramp_end; | |
194 | } | |
195 | ||
196 | static void | |
197 | i386fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
198 | { | |
199 | /* It's almost identical to FreeBSD a.out. */ | |
200 | i386fbsdaout_init_abi (info, gdbarch); | |
201 | ||
202 | /* Except that it uses ELF. */ | |
203 | i386_elf_init_abi (info, gdbarch); | |
9c5045b5 MK |
204 | |
205 | /* FreeBSD ELF uses SVR4-style shared libraries. */ | |
206 | set_gdbarch_in_solib_call_trampoline (gdbarch, | |
207 | generic_in_solib_call_trampoline); | |
8201327c MK |
208 | } |
209 | ||
210 | /* FreeBSD 4.0-RELEASE or later. */ | |
211 | ||
212 | /* From <machine/signal.h>. */ | |
213 | int i386fbsd4_sc_pc_offset = 76; | |
214 | ||
215 | static void | |
216 | i386fbsd4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
217 | { | |
218 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
219 | ||
220 | /* Inherit stuff from older releases. We assume that FreeBSD | |
221 | 4.0-RELEASE always uses ELF. */ | |
222 | i386fbsd_init_abi (info, gdbarch); | |
223 | ||
224 | /* FreeBSD 4.0 introduced a new `struct sigcontext'. */ | |
225 | tdep->sc_pc_offset = i386fbsd4_sc_pc_offset; | |
226 | } | |
227 | ||
228 | \f | |
229 | static enum gdb_osabi | |
230 | i386bsd_aout_osabi_sniffer (bfd *abfd) | |
231 | { | |
232 | if (strcmp (bfd_get_target (abfd), "a.out-i386-netbsd") == 0) | |
233 | return GDB_OSABI_NETBSD_AOUT; | |
234 | ||
235 | if (strcmp (bfd_get_target (abfd), "a.out-i386-freebsd") == 0) | |
236 | return GDB_OSABI_FREEBSD_AOUT; | |
237 | ||
238 | return GDB_OSABI_UNKNOWN; | |
239 | } | |
240 | ||
241 | \f | |
242 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
243 | void _initialize_i386bsd_tdep (void); | |
244 | ||
245 | void | |
246 | _initialize_i386bsd_tdep (void) | |
247 | { | |
248 | gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_aout_flavour, | |
249 | i386bsd_aout_osabi_sniffer); | |
250 | ||
251 | gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_NETBSD_AOUT, | |
252 | i386nbsd_init_abi); | |
253 | gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_NETBSD_ELF, | |
254 | i386nbsdelf_init_abi); | |
255 | gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_FREEBSD_AOUT, | |
256 | i386fbsdaout_init_abi); | |
257 | gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_FREEBSD_ELF, | |
258 | i386fbsd4_init_abi); | |
259 | } |