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1 | /* Semi-dynamic architecture support for GDB, the GNU debugger. |
2 | Copyright 1998, Free Software Foundation, Inc. | |
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, Boston, MA 02111-1307, USA. */ | |
19 | ||
20 | #include "defs.h" | |
21 | #include "bfd.h" | |
22 | #include "gdbcmd.h" | |
23 | ||
24 | ||
25 | /* Functions to manipulate the endianness of the target. */ | |
26 | ||
27 | #ifdef TARGET_BYTE_ORDER_SELECTABLE | |
28 | /* compat - Catch old targets that expect a selectable byte-order to | |
29 | default to BIG_ENDIAN */ | |
30 | #ifndef TARGET_BYTE_ORDER_DEFAULT | |
31 | #define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN | |
32 | #endif | |
33 | #endif | |
34 | #ifndef TARGET_BYTE_ORDER_DEFAULT | |
35 | /* compat - Catch old non byte-order selectable targets that do not | |
36 | define TARGET_BYTE_ORDER_DEFAULT and instead expect | |
37 | TARGET_BYTE_ORDER to be used as the default. For targets that | |
38 | defined neither TARGET_BYTE_ORDER nor TARGET_BYTE_ORDER_DEFAULT the | |
39 | below will get a strange compiler warning. */ | |
40 | #define TARGET_BYTE_ORDER_DEFAULT TARGET_BYTE_ORDER | |
41 | #endif | |
42 | int target_byte_order = TARGET_BYTE_ORDER_DEFAULT; | |
43 | int target_byte_order_auto = 1; | |
44 | ||
45 | /* Chain containing the \"set endian\" commands. */ | |
46 | static struct cmd_list_element *endianlist = NULL; | |
47 | ||
48 | /* Called by ``show endian''. */ | |
49 | static void show_endian PARAMS ((char *, int)); | |
50 | static void | |
51 | show_endian (args, from_tty) | |
52 | char *args; | |
53 | int from_tty; | |
54 | { | |
55 | char *msg = | |
56 | (TARGET_BYTE_ORDER_AUTO | |
57 | ? "The target endianness is set automatically (currently %s endian)\n" | |
58 | : "The target is assumed to be %s endian\n"); | |
59 | printf_unfiltered (msg, (TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little")); | |
60 | } | |
61 | ||
62 | /* Called if the user enters ``set endian'' without an argument. */ | |
63 | static void set_endian PARAMS ((char *, int)); | |
64 | static void | |
65 | set_endian (args, from_tty) | |
66 | char *args; | |
67 | int from_tty; | |
68 | { | |
69 | printf_unfiltered ("\"set endian\" must be followed by \"auto\", \"big\" or \"little\".\n"); | |
70 | show_endian (args, from_tty); | |
71 | } | |
72 | ||
73 | /* Called by ``set endian big''. */ | |
74 | static void set_endian_big PARAMS ((char *, int)); | |
75 | static void | |
76 | set_endian_big (args, from_tty) | |
77 | char *args; | |
78 | int from_tty; | |
79 | { | |
80 | if (TARGET_BYTE_ORDER_SELECTABLE_P) | |
81 | { | |
82 | target_byte_order = BIG_ENDIAN; | |
83 | target_byte_order_auto = 0; | |
84 | } | |
85 | else | |
86 | { | |
87 | printf_unfiltered ("Byte order is not selectable."); | |
88 | show_endian (args, from_tty); | |
89 | } | |
90 | } | |
91 | ||
92 | /* Called by ``set endian little''. */ | |
93 | static void set_endian_little PARAMS ((char *, int)); | |
94 | static void | |
95 | set_endian_little (args, from_tty) | |
96 | char *args; | |
97 | int from_tty; | |
98 | { | |
99 | if (TARGET_BYTE_ORDER_SELECTABLE_P) | |
100 | { | |
101 | target_byte_order = LITTLE_ENDIAN; | |
102 | target_byte_order_auto = 0; | |
103 | } | |
104 | else | |
105 | { | |
106 | printf_unfiltered ("Byte order is not selectable."); | |
107 | show_endian (args, from_tty); | |
108 | } | |
109 | } | |
110 | ||
111 | /* Called by ``set endian auto''. */ | |
112 | static void set_endian_auto PARAMS ((char *, int)); | |
113 | static void | |
114 | set_endian_auto (args, from_tty) | |
115 | char *args; | |
116 | int from_tty; | |
117 | { | |
118 | if (TARGET_BYTE_ORDER_SELECTABLE_P) | |
119 | { | |
120 | target_byte_order_auto = 1; | |
121 | } | |
122 | else | |
123 | { | |
124 | printf_unfiltered ("Byte order is not selectable."); | |
125 | show_endian (args, from_tty); | |
126 | } | |
127 | } | |
128 | ||
129 | /* Set the endianness from a BFD. */ | |
130 | static void set_endian_from_file PARAMS ((bfd *)); | |
131 | static void | |
132 | set_endian_from_file (abfd) | |
133 | bfd *abfd; | |
134 | { | |
135 | if (TARGET_BYTE_ORDER_SELECTABLE_P) | |
136 | { | |
137 | int want; | |
138 | ||
139 | if (bfd_big_endian (abfd)) | |
140 | want = BIG_ENDIAN; | |
141 | else | |
142 | want = LITTLE_ENDIAN; | |
143 | if (TARGET_BYTE_ORDER_AUTO) | |
144 | target_byte_order = want; | |
145 | else if (TARGET_BYTE_ORDER != want) | |
146 | warning ("%s endian file does not match %s endian target.", | |
147 | want == BIG_ENDIAN ? "big" : "little", | |
148 | TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little"); | |
149 | } | |
150 | else | |
151 | { | |
152 | if (bfd_big_endian (abfd) | |
153 | ? TARGET_BYTE_ORDER != BIG_ENDIAN | |
154 | : TARGET_BYTE_ORDER == BIG_ENDIAN) | |
155 | warning ("%s endian file does not match %s endian target.", | |
156 | bfd_big_endian (abfd) ? "big" : "little", | |
157 | TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little"); | |
158 | } | |
159 | } | |
160 | ||
161 | ||
162 | ||
163 | /* Functions to manipulate the architecture of the target */ | |
164 | ||
165 | int target_architecture_auto = 1; | |
166 | extern const bfd_arch_info_type bfd_default_arch_struct; | |
167 | const bfd_arch_info_type *target_architecture = &bfd_default_arch_struct; | |
168 | int (*target_architecture_hook) PARAMS ((const bfd_arch_info_type *ap)); | |
169 | ||
170 | /* Do the real work of changing the current architecture */ | |
171 | static void | |
172 | set_arch (arch) | |
173 | const bfd_arch_info_type *arch; | |
174 | { | |
175 | /* FIXME: Is it compatible with gdb? */ | |
176 | /* Check with the target on the setting */ | |
177 | if (target_architecture_hook != NULL | |
178 | && !target_architecture_hook (arch)) | |
179 | printf_unfiltered ("Target does not support `%s' architecture.\n", | |
180 | arch->printable_name); | |
181 | else | |
182 | { | |
183 | target_architecture_auto = 0; | |
184 | target_architecture = arch; | |
185 | } | |
186 | } | |
187 | ||
188 | /* Called if the user enters ``show architecture'' without an argument. */ | |
189 | static void show_architecture PARAMS ((char *, int)); | |
190 | static void | |
191 | show_architecture (args, from_tty) | |
192 | char *args; | |
193 | int from_tty; | |
194 | { | |
195 | const char *arch; | |
196 | arch = target_architecture->printable_name; | |
197 | if (target_architecture_auto) | |
198 | printf_filtered ("The target architecture is set automatically (currently %s)\n", arch); | |
199 | else | |
200 | printf_filtered ("The target architecture is assumed to be %s\n", arch); | |
201 | } | |
202 | ||
203 | /* Called if the user enters ``set architecture'' with or without an | |
204 | argument. */ | |
205 | static void set_architecture PARAMS ((char *, int)); | |
206 | static void | |
207 | set_architecture (args, from_tty) | |
208 | char *args; | |
209 | int from_tty; | |
210 | { | |
211 | if (args == NULL) | |
212 | { | |
213 | printf_unfiltered ("\"set architecture\" must be followed by \"auto\" or an architecture name.\n"); | |
214 | } | |
215 | else if (strcmp (args, "auto") == 0) | |
216 | { | |
217 | target_architecture_auto = 1; | |
218 | } | |
219 | else | |
220 | { | |
221 | const bfd_arch_info_type *arch = bfd_scan_arch (args); | |
222 | if (arch != NULL) | |
223 | set_arch (arch); | |
224 | else | |
225 | printf_unfiltered ("Architecture `%s' not reconized.\n", args); | |
226 | } | |
227 | } | |
228 | ||
229 | /* Called if the user enters ``info architecture'' without an argument. */ | |
230 | static void info_architecture PARAMS ((char *, int)); | |
231 | static void | |
232 | info_architecture (args, from_tty) | |
233 | char *args; | |
234 | int from_tty; | |
235 | { | |
236 | enum bfd_architecture a; | |
237 | printf_filtered ("Available architectures are:\n"); | |
238 | for (a = bfd_arch_obscure + 1; a < bfd_arch_last; a++) | |
239 | { | |
240 | const bfd_arch_info_type *ap = bfd_lookup_arch (a, 0); | |
241 | if (ap != NULL) | |
242 | { | |
243 | do | |
244 | { | |
245 | printf_filtered (" %s", ap->printable_name); | |
246 | ap = ap->next; | |
247 | } | |
248 | while (ap != NULL); | |
249 | printf_filtered ("\n"); | |
250 | } | |
251 | } | |
252 | } | |
253 | ||
254 | /* Set the architecture from arch/machine */ | |
255 | void | |
256 | set_architecture_from_arch_mach (arch, mach) | |
257 | enum bfd_architecture arch; | |
258 | unsigned long mach; | |
259 | { | |
260 | const bfd_arch_info_type *wanted = bfd_lookup_arch (arch, mach); | |
261 | if (wanted != NULL) | |
262 | set_arch (wanted); | |
263 | else | |
264 | fatal ("hardwired architecture/machine not reconized"); | |
265 | } | |
266 | ||
267 | /* Set the architecture from a BFD */ | |
268 | static void set_architecture_from_file PARAMS ((bfd *)); | |
269 | static void | |
270 | set_architecture_from_file (abfd) | |
271 | bfd *abfd; | |
272 | { | |
273 | const bfd_arch_info_type *wanted = bfd_get_arch_info (abfd); | |
274 | if (target_architecture_auto) | |
275 | { | |
276 | if (target_architecture_hook != NULL | |
277 | && !target_architecture_hook (wanted)) | |
278 | warning ("Target may not support %s architecture", | |
279 | wanted->printable_name); | |
280 | target_architecture = wanted; | |
281 | } | |
282 | else if (wanted != target_architecture) | |
283 | { | |
284 | warning ("%s architecture file may be incompatible with %s target.", | |
285 | wanted->printable_name, | |
286 | target_architecture->printable_name); | |
287 | } | |
288 | } | |
289 | ||
290 | ||
291 | ||
292 | /* Disassembler */ | |
293 | ||
294 | /* Pointer to the target-dependent disassembly function. */ | |
295 | int (*tm_print_insn) PARAMS ((bfd_vma, disassemble_info *)); | |
296 | disassemble_info tm_print_insn_info; | |
297 | ||
298 | ||
299 | ||
300 | /* Set the dynamic target-system-dependant parameters (architecture, | |
301 | byte-order) using information found in the BFD */ | |
302 | ||
303 | void | |
304 | set_gdbarch_from_file (abfd) | |
305 | bfd *abfd; | |
306 | { | |
307 | set_architecture_from_file (abfd); | |
308 | set_endian_from_file (abfd); | |
309 | } | |
310 | ||
311 | ||
312 | extern void _initialize_gdbarch PARAMS ((void)); | |
313 | void | |
314 | _initialize_gdbarch () | |
315 | { | |
316 | add_prefix_cmd ("endian", class_support, set_endian, | |
317 | "Set endianness of target.", | |
318 | &endianlist, "set endian ", 0, &setlist); | |
319 | add_cmd ("big", class_support, set_endian_big, | |
320 | "Set target as being big endian.", &endianlist); | |
321 | add_cmd ("little", class_support, set_endian_little, | |
322 | "Set target as being little endian.", &endianlist); | |
323 | add_cmd ("auto", class_support, set_endian_auto, | |
324 | "Select target endianness automatically.", &endianlist); | |
325 | add_cmd ("endian", class_support, show_endian, | |
326 | "Show endianness of target.", &showlist); | |
327 | ||
328 | add_cmd ("architecture", class_support, set_architecture, | |
329 | "Set architecture of target.", &setlist); | |
330 | add_alias_cmd ("processor", "architecture", class_support, 1, &setlist); | |
331 | add_cmd ("architecture", class_support, show_architecture, | |
332 | "Show architecture of target.", &showlist); | |
333 | add_cmd ("architecture", class_support, info_architecture, | |
334 | "List supported target architectures", &infolist); | |
335 | ||
336 | INIT_DISASSEMBLE_INFO_NO_ARCH (tm_print_insn_info, gdb_stdout, (fprintf_ftype)fprintf_filtered); | |
337 | tm_print_insn_info.flavour = bfd_target_unknown_flavour; | |
338 | tm_print_insn_info.read_memory_func = dis_asm_read_memory; | |
339 | tm_print_insn_info.memory_error_func = dis_asm_memory_error; | |
340 | tm_print_insn_info.print_address_func = dis_asm_print_address; | |
341 | } |