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" | |
22 | #include "frame.h" | |
23 | #include "gdbcore.h" | |
24 | #include "regcache.h" | |
25 | ||
8201327c | 26 | #include "i386-tdep.h" |
b7247919 | 27 | |
8201327c | 28 | /* Support for signal handlers. */ |
b7247919 MK |
29 | |
30 | /* Return whether PC is in a BSD sigtramp routine. */ | |
31 | ||
8201327c MK |
32 | static int |
33 | i386bsd_pc_in_sigtramp (CORE_ADDR pc, char *name) | |
b7247919 | 34 | { |
8201327c | 35 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
b7247919 | 36 | |
8201327c MK |
37 | return (pc >= tdep->sigtramp_start && pc < tdep->sigtramp_end); |
38 | } | |
b7247919 MK |
39 | |
40 | /* Assuming FRAME is for a BSD sigtramp routine, return the address of | |
41 | the associated sigcontext structure. */ | |
42 | ||
43 | static CORE_ADDR | |
44 | i386bsd_sigcontext_addr (struct frame_info *frame) | |
45 | { | |
46 | if (frame->next) | |
47 | /* If this isn't the top frame, the next frame must be for the | |
48 | signal handler itself. A pointer to the sigcontext structure | |
49 | is passed as the third argument to the signal handler. */ | |
50 | return read_memory_unsigned_integer (frame->next->frame + 16, 4); | |
51 | ||
52 | /* This is the top frame. We'll have to find the address of the | |
53 | sigcontext structure by looking at the stack pointer. */ | |
54 | return read_memory_unsigned_integer (read_register (SP_REGNUM) + 8, 4); | |
55 | } | |
56 | ||
57 | /* Assuming FRAME is for a BSD sigtramp routine, return the saved | |
8201327c | 58 | program counter. |
b7247919 | 59 | |
8201327c MK |
60 | Note: This function is used for Solaris 2 too, so don't make it |
61 | static. */ | |
62 | ||
63 | CORE_ADDR | |
b7247919 MK |
64 | i386bsd_sigtramp_saved_pc (struct frame_info *frame) |
65 | { | |
8201327c | 66 | int sc_pc_offset = gdbarch_tdep (current_gdbarch)->sc_pc_offset; |
b7247919 | 67 | CORE_ADDR addr; |
8201327c | 68 | |
b7247919 | 69 | addr = i386bsd_sigcontext_addr (frame); |
8201327c | 70 | return read_memory_unsigned_integer (addr + sc_pc_offset, 4); |
b7247919 MK |
71 | } |
72 | ||
73 | /* Return the saved program counter for FRAME. */ | |
74 | ||
8201327c | 75 | static CORE_ADDR |
b7247919 MK |
76 | i386bsd_frame_saved_pc (struct frame_info *frame) |
77 | { | |
78 | if (frame->signal_handler_caller) | |
79 | return i386bsd_sigtramp_saved_pc (frame); | |
80 | ||
81 | return read_memory_unsigned_integer (frame->frame + 4, 4); | |
82 | } | |
8201327c MK |
83 | |
84 | /* Return the start address of the sigtramp routine. */ | |
85 | ||
86 | CORE_ADDR | |
87 | i386bsd_sigtramp_start (CORE_ADDR pc) | |
88 | { | |
89 | return gdbarch_tdep (current_gdbarch)->sigtramp_start; | |
90 | } | |
91 | ||
92 | /* Return the end address of the sigtramp routine. */ | |
93 | ||
94 | CORE_ADDR | |
95 | i386bsd_sigtramp_end (CORE_ADDR pc) | |
96 | { | |
97 | return gdbarch_tdep (current_gdbarch)->sigtramp_end; | |
98 | } | |
99 | \f | |
100 | ||
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 | ||
113 | tdep->jb_pc_offset = 0; | |
114 | ||
115 | tdep->sigtramp_saved_pc = i386bsd_sigtramp_saved_pc; | |
116 | tdep->sigtramp_start = 0xfdbfdfc0; | |
117 | tdep->sigtramp_end = 0xfdbfe000; | |
118 | tdep->sc_pc_offset = i386bsd_sc_pc_offset; | |
119 | } | |
120 | ||
121 | /* NetBSD 1.0 or later. */ | |
122 | ||
123 | /* From <machine/signal.h>. */ | |
124 | int i386nbsd_sc_pc_offset = 44; | |
125 | ||
126 | static void | |
127 | i386nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
128 | { | |
129 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
130 | ||
131 | /* Obviously NetBSD is BSD-based. */ | |
132 | i386bsd_init_abi (info, gdbarch); | |
133 | ||
134 | /* NetBSD uses -freg-struct-return by default. */ | |
135 | tdep->struct_return = reg_struct_return; | |
136 | ||
137 | /* NetBSD uses a different memory layout. */ | |
138 | tdep->sigtramp_start = 0xbfbfdf20; | |
139 | tdep->sigtramp_end = 0xbfbfdff0; | |
140 | ||
141 | /* NetBSD has a `struct sigcontext' that's different from the | |
142 | origional 4.3 BSD. */ | |
143 | tdep->sc_pc_offset = i386nbsd_sc_pc_offset; | |
144 | } | |
145 | ||
146 | /* NetBSD ELF. */ | |
147 | static void | |
148 | i386nbsdelf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
149 | { | |
150 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
151 | ||
152 | /* It's still NetBSD. */ | |
153 | i386nbsd_init_abi (info, gdbarch); | |
154 | ||
155 | /* But ELF-based. */ | |
156 | i386_elf_init_abi (info, gdbarch); | |
157 | ||
158 | /* NetBSD ELF uses -fpcc-struct-return by default. */ | |
159 | tdep->struct_return = pcc_struct_return; | |
160 | ||
161 | /* We support the SSE registers on NetBSD ELF. */ | |
162 | tdep->num_xmm_regs = I386_NUM_XREGS - 1; | |
163 | set_gdbarch_num_regs (gdbarch, I386_NUM_GREGS + I386_NUM_FREGS | |
164 | + I386_NUM_XREGS); | |
165 | } | |
166 | ||
167 | /* FreeBSD 3.0-RELEASE or later. */ | |
168 | ||
169 | CORE_ADDR i386fbsd_sigtramp_start = 0xbfbfdf20; | |
170 | CORE_ADDR i386fbsd_sigtramp_end = 0xbfbfdff0; | |
171 | ||
172 | static void | |
173 | i386fbsdaout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
174 | { | |
175 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
176 | ||
177 | /* Obviously FreeBSD is BSD-based. */ | |
178 | i386bsd_init_abi (info, gdbarch); | |
179 | ||
180 | /* FreeBSD uses -freg-struct-return by default. */ | |
181 | tdep->struct_return = reg_struct_return; | |
182 | ||
183 | /* FreeBSD uses a different memory layout. */ | |
184 | tdep->sigtramp_start = i386fbsd_sigtramp_start; | |
185 | tdep->sigtramp_end = i386fbsd_sigtramp_end; | |
186 | } | |
187 | ||
188 | static void | |
189 | i386fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
190 | { | |
191 | /* It's almost identical to FreeBSD a.out. */ | |
192 | i386fbsdaout_init_abi (info, gdbarch); | |
193 | ||
194 | /* Except that it uses ELF. */ | |
195 | i386_elf_init_abi (info, gdbarch); | |
196 | } | |
197 | ||
198 | /* FreeBSD 4.0-RELEASE or later. */ | |
199 | ||
200 | /* From <machine/signal.h>. */ | |
201 | int i386fbsd4_sc_pc_offset = 76; | |
202 | ||
203 | static void | |
204 | i386fbsd4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
205 | { | |
206 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
207 | ||
208 | /* Inherit stuff from older releases. We assume that FreeBSD | |
209 | 4.0-RELEASE always uses ELF. */ | |
210 | i386fbsd_init_abi (info, gdbarch); | |
211 | ||
212 | /* FreeBSD 4.0 introduced a new `struct sigcontext'. */ | |
213 | tdep->sc_pc_offset = i386fbsd4_sc_pc_offset; | |
214 | } | |
215 | ||
216 | \f | |
217 | static enum gdb_osabi | |
218 | i386bsd_aout_osabi_sniffer (bfd *abfd) | |
219 | { | |
220 | if (strcmp (bfd_get_target (abfd), "a.out-i386-netbsd") == 0) | |
221 | return GDB_OSABI_NETBSD_AOUT; | |
222 | ||
223 | if (strcmp (bfd_get_target (abfd), "a.out-i386-freebsd") == 0) | |
224 | return GDB_OSABI_FREEBSD_AOUT; | |
225 | ||
226 | return GDB_OSABI_UNKNOWN; | |
227 | } | |
228 | ||
229 | \f | |
230 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
231 | void _initialize_i386bsd_tdep (void); | |
232 | ||
233 | void | |
234 | _initialize_i386bsd_tdep (void) | |
235 | { | |
236 | gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_aout_flavour, | |
237 | i386bsd_aout_osabi_sniffer); | |
238 | ||
239 | gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_NETBSD_AOUT, | |
240 | i386nbsd_init_abi); | |
241 | gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_NETBSD_ELF, | |
242 | i386nbsdelf_init_abi); | |
243 | gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_FREEBSD_AOUT, | |
244 | i386fbsdaout_init_abi); | |
245 | gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_FREEBSD_ELF, | |
246 | i386fbsd4_init_abi); | |
247 | } |