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8a96bc77 MK |
1 | /* Target-dependent code for FreeBSD/i386. |
2 | ||
5d93ae8c | 3 | Copyright 2003, 2004 Free Software Foundation, Inc. |
8a96bc77 MK |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, | |
20 | Boston, MA 02111-1307, USA. */ | |
21 | ||
22 | #include "defs.h" | |
23 | #include "arch-utils.h" | |
24 | #include "osabi.h" | |
25 | ||
26 | #include "i386-tdep.h" | |
27 | #include "i387-tdep.h" | |
7e654c37 | 28 | #include "solib-svr4.h" |
8a96bc77 MK |
29 | |
30 | /* FreeBSD 3.0-RELEASE or later. */ | |
31 | ||
32 | /* From <machine/reg.h>. */ | |
33 | static int i386fbsd_r_reg_offset[] = | |
34 | { | |
35 | 9 * 4, 8 * 4, 7 * 4, 6 * 4, /* %eax, %ecx, %edx, %ebx */ | |
36 | 15 * 4, 4 * 4, /* %esp, %ebp */ | |
37 | 3 * 4, 2 * 4, /* %esi, %edi */ | |
38 | 12 * 4, 14 * 4, /* %eip, %eflags */ | |
39 | 13 * 4, 16 * 4, /* %cs, %ss */ | |
40 | 1 * 4, 0 * 4, -1, -1 /* %ds, %es, %fs, %gs */ | |
41 | }; | |
42 | ||
5d93ae8c MK |
43 | /* Sigtramp routine location. */ |
44 | CORE_ADDR i386fbsd_sigtramp_start_addr = 0xbfbfdf20; | |
45 | CORE_ADDR i386fbsd_sigtramp_end_addr = 0xbfbfdff0; | |
8a96bc77 MK |
46 | |
47 | /* From <machine/signal.h>. */ | |
48 | static int i386fbsd_sc_reg_offset[] = | |
49 | { | |
50 | 8 + 14 * 4, /* %eax */ | |
51 | 8 + 13 * 4, /* %ecx */ | |
52 | 8 + 12 * 4, /* %edx */ | |
53 | 8 + 11 * 4, /* %ebx */ | |
54 | 8 + 0 * 4, /* %esp */ | |
55 | 8 + 1 * 4, /* %ebp */ | |
56 | 8 + 10 * 4, /* %esi */ | |
57 | 8 + 9 * 4, /* %edi */ | |
58 | 8 + 3 * 4, /* %eip */ | |
59 | 8 + 4 * 4, /* %eflags */ | |
60 | 8 + 7 * 4, /* %cs */ | |
61 | 8 + 8 * 4, /* %ss */ | |
62 | 8 + 6 * 4, /* %ds */ | |
63 | 8 + 5 * 4, /* %es */ | |
64 | 8 + 15 * 4, /* %fs */ | |
65 | 8 + 16 * 4 /* %gs */ | |
66 | }; | |
67 | ||
68 | static void | |
69 | i386fbsdaout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
70 | { | |
71 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
72 | ||
73 | /* Obviously FreeBSD is BSD-based. */ | |
74 | i386bsd_init_abi (info, gdbarch); | |
75 | ||
76 | /* FreeBSD has a different `struct reg', and reserves some space for | |
77 | its FPU emulator in `struct fpreg'. */ | |
78 | tdep->gregset_reg_offset = i386fbsd_r_reg_offset; | |
79 | tdep->gregset_num_regs = ARRAY_SIZE (i386fbsd_r_reg_offset); | |
80 | tdep->sizeof_gregset = 18 * 4; | |
81 | tdep->sizeof_fpregset = 176; | |
82 | ||
83 | /* FreeBSD uses -freg-struct-return by default. */ | |
84 | tdep->struct_return = reg_struct_return; | |
85 | ||
86 | /* FreeBSD uses a different memory layout. */ | |
5d93ae8c MK |
87 | tdep->sigtramp_start = i386fbsd_sigtramp_start_addr; |
88 | tdep->sigtramp_end = i386fbsd_sigtramp_end_addr; | |
8a96bc77 MK |
89 | |
90 | /* FreeBSD has a more complete `struct sigcontext'. */ | |
91 | tdep->sc_reg_offset = i386fbsd_sc_reg_offset; | |
92 | tdep->sc_num_regs = ARRAY_SIZE (i386fbsd_sc_reg_offset); | |
93 | } | |
94 | ||
95 | static void | |
96 | i386fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
97 | { | |
98 | /* It's almost identical to FreeBSD a.out. */ | |
99 | i386fbsdaout_init_abi (info, gdbarch); | |
100 | ||
101 | /* Except that it uses ELF. */ | |
102 | i386_elf_init_abi (info, gdbarch); | |
103 | ||
104 | /* FreeBSD ELF uses SVR4-style shared libraries. */ | |
7e654c37 MK |
105 | set_gdbarch_in_solib_call_trampoline |
106 | (gdbarch, generic_in_solib_call_trampoline); | |
107 | set_solib_svr4_fetch_link_map_offsets | |
108 | (gdbarch, svr4_ilp32_fetch_link_map_offsets); | |
8a96bc77 MK |
109 | } |
110 | ||
111 | /* FreeBSD 4.0-RELEASE or later. */ | |
112 | ||
113 | /* From <machine/reg.h>. */ | |
114 | static int i386fbsd4_r_reg_offset[] = | |
115 | { | |
116 | 10 * 4, 9 * 4, 8 * 4, 7 * 4, /* %eax, %ecx, %edx, %ebx */ | |
117 | 16 * 4, 5 * 4, /* %esp, %ebp */ | |
118 | 4 * 4, 3 * 4, /* %esi, %edi */ | |
119 | 13 * 4, 15 * 4, /* %eip, %eflags */ | |
120 | 14 * 4, 17 * 4, /* %cs, %ss */ | |
121 | 2 * 4, 1 * 4, 0 * 4, 18 * 4 /* %ds, %es, %fs, %gs */ | |
122 | }; | |
123 | ||
124 | /* From <machine/signal.h>. */ | |
125 | int i386fbsd4_sc_reg_offset[] = | |
126 | { | |
127 | 20 + 11 * 4, /* %eax */ | |
128 | 20 + 10 * 4, /* %ecx */ | |
129 | 20 + 9 * 4, /* %edx */ | |
130 | 20 + 8 * 4, /* %ebx */ | |
131 | 20 + 17 * 4, /* %esp */ | |
132 | 20 + 6 * 4, /* %ebp */ | |
133 | 20 + 5 * 4, /* %esi */ | |
134 | 20 + 4 * 4, /* %edi */ | |
135 | 20 + 14 * 4, /* %eip */ | |
136 | 20 + 16 * 4, /* %eflags */ | |
137 | 20 + 15 * 4, /* %cs */ | |
138 | 20 + 18 * 4, /* %ss */ | |
139 | 20 + 3 * 4, /* %ds */ | |
140 | 20 + 2 * 4, /* %es */ | |
141 | 20 + 1 * 4, /* %fs */ | |
142 | 20 + 0 * 4 /* %gs */ | |
143 | }; | |
144 | ||
145 | static void | |
146 | i386fbsd4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
147 | { | |
148 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
149 | ||
150 | /* Inherit stuff from older releases. We assume that FreeBSD | |
151 | 4.0-RELEASE always uses ELF. */ | |
152 | i386fbsd_init_abi (info, gdbarch); | |
153 | ||
154 | /* FreeBSD 4.0 introduced a new `struct reg'. */ | |
155 | tdep->gregset_reg_offset = i386fbsd4_r_reg_offset; | |
156 | tdep->gregset_num_regs = ARRAY_SIZE (i386fbsd4_r_reg_offset); | |
157 | tdep->sizeof_gregset = 19 * 4; | |
158 | ||
159 | /* FreeBSD 4.0 introduced a new `struct sigcontext'. */ | |
160 | tdep->sc_reg_offset = i386fbsd4_sc_reg_offset; | |
161 | tdep->sc_num_regs = ARRAY_SIZE (i386fbsd4_sc_reg_offset); | |
162 | } | |
163 | ||
164 | \f | |
165 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
166 | void _initialize_i386fbsd_tdep (void); | |
167 | ||
168 | void | |
169 | _initialize_i386fbsd_tdep (void) | |
170 | { | |
171 | gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_FREEBSD_AOUT, | |
172 | i386fbsdaout_init_abi); | |
173 | gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_FREEBSD_ELF, | |
174 | i386fbsd4_init_abi); | |
175 | } |