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c906108c SS |
1 | /* This file is part of the program psim. |
2 | ||
3 | Copyright (C) 1994-1996,1998, Andrew Cagney <cagney@highland.com.au> | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 2 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program; if not, write to the Free Software | |
17 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
18 | ||
19 | */ | |
20 | ||
21 | ||
22 | #include <signal.h> /* FIXME - should be machine dependant version */ | |
23 | #include <stdarg.h> | |
24 | #include <ctype.h> | |
25 | ||
26 | #include "psim.h" | |
27 | #include "options.h" | |
28 | ||
29 | #undef printf_filtered /* blow away the mapping */ | |
30 | ||
31 | #ifdef HAVE_STDLIB_H | |
32 | #include <stdlib.h> | |
33 | #endif | |
34 | ||
35 | #ifdef HAVE_STRING_H | |
36 | #include <string.h> | |
37 | #else | |
38 | #ifdef HAVE_STRINGS_H | |
39 | #include <strings.h> | |
40 | #endif | |
41 | #endif | |
42 | ||
43 | #include "defs.h" | |
44 | #include "bfd.h" | |
45 | #include "callback.h" | |
46 | #include "remote-sim.h" | |
47 | ||
7a292a7a SS |
48 | /* Define the rate at which the simulator should poll the host |
49 | for a quit. */ | |
50 | #ifndef POLL_QUIT_INTERVAL | |
51 | #define POLL_QUIT_INTERVAL 0x20 | |
52 | #endif | |
53 | ||
54 | static int poll_quit_count = POLL_QUIT_INTERVAL; | |
c906108c SS |
55 | |
56 | /* Structures used by the simulator, for gdb just have static structures */ | |
57 | ||
58 | static psim *simulator; | |
59 | static device *root_device; | |
60 | static host_callback *callbacks; | |
61 | ||
62 | /* We use GDB's reg_names array to map GDB register numbers onto | |
63 | names, which we can then look up in the register table. | |
64 | ||
65 | We used to just use the REGISTER_NAMES macro, from GDB's | |
66 | target-dependent header files. That was kind of nice, because it | |
67 | meant that libsim.a had only a compile-time dependency on GDB; | |
68 | using reg_names directly means that there are now link-time and | |
69 | run-time dependencies too. | |
70 | ||
71 | However, the GDB PPC back-end now modifies the reg_names array when | |
72 | the user runs the `set processor' command, which affects the | |
73 | meanings of the register numbers. So the sim needs to see the | |
74 | register names GDB is actually using. | |
75 | ||
76 | Perhaps the host_callback structure could contain a pointer to the | |
77 | register name table; that would be cleaner. */ | |
78 | ||
79 | SIM_DESC | |
80 | sim_open (SIM_OPEN_KIND kind, | |
81 | host_callback *callback, | |
82 | struct _bfd *abfd, | |
83 | char **argv) | |
84 | { | |
85 | callbacks = callback; | |
86 | ||
87 | /* Note: The simulation is not created by sim_open() because | |
88 | complete information is not yet available */ | |
89 | /* trace the call */ | |
90 | TRACE(trace_gdb, ("sim_open called\n")); | |
91 | ||
92 | if (root_device != NULL) | |
93 | sim_io_printf_filtered("Warning - re-open of simulator leaks memory\n"); | |
94 | root_device = psim_tree(); | |
95 | simulator = NULL; | |
96 | ||
97 | psim_options(root_device, argv + 1); | |
98 | ||
99 | if (ppc_trace[trace_opts]) | |
100 | print_options (); | |
101 | ||
102 | /* fudge our descriptor for now */ | |
103 | return (SIM_DESC) 1; | |
104 | } | |
105 | ||
106 | ||
107 | void | |
108 | sim_close (SIM_DESC sd, int quitting) | |
109 | { | |
110 | TRACE(trace_gdb, ("sim_close(quitting=%d) called\n", quitting)); | |
111 | if (ppc_trace[trace_print_info] && simulator != NULL) | |
112 | psim_print_info (simulator, ppc_trace[trace_print_info]); | |
113 | } | |
114 | ||
115 | ||
116 | SIM_RC | |
117 | sim_load (SIM_DESC sd, char *prog, bfd *abfd, int from_tty) | |
118 | { | |
119 | TRACE(trace_gdb, ("sim_load(prog=%s, from_tty=%d) called\n", | |
120 | prog, from_tty)); | |
121 | ASSERT(prog != NULL); | |
122 | ||
123 | /* create the simulator */ | |
124 | TRACE(trace_gdb, ("sim_load() - first time, create the simulator\n")); | |
125 | simulator = psim_create(prog, root_device); | |
126 | ||
127 | /* bring in all the data section */ | |
128 | psim_init(simulator); | |
129 | ||
130 | /* get the start address */ | |
131 | if (abfd == NULL) | |
132 | { | |
133 | abfd = bfd_openr (prog, 0); | |
134 | if (abfd == NULL) | |
135 | error ("psim: can't open \"%s\": %s\n", | |
136 | prog, bfd_errmsg (bfd_get_error ())); | |
137 | if (!bfd_check_format (abfd, bfd_object)) | |
138 | { | |
139 | const char *errmsg = bfd_errmsg (bfd_get_error ()); | |
140 | bfd_close (abfd); | |
141 | error ("psim: \"%s\" is not an object file: %s\n", | |
142 | prog, errmsg); | |
143 | } | |
144 | bfd_close (abfd); | |
145 | } | |
146 | ||
147 | return SIM_RC_OK; | |
148 | } | |
149 | ||
150 | ||
151 | int | |
152 | sim_read (SIM_DESC sd, SIM_ADDR mem, unsigned char *buf, int length) | |
153 | { | |
154 | int result = psim_read_memory(simulator, MAX_NR_PROCESSORS, | |
155 | buf, mem, length); | |
156 | TRACE(trace_gdb, ("sim_read(mem=0x%lx, buf=0x%lx, length=%d) = %d\n", | |
157 | (long)mem, (long)buf, length, result)); | |
158 | return result; | |
159 | } | |
160 | ||
161 | ||
162 | int | |
163 | sim_write (SIM_DESC sd, SIM_ADDR mem, unsigned char *buf, int length) | |
164 | { | |
165 | int result = psim_write_memory(simulator, MAX_NR_PROCESSORS, | |
166 | buf, mem, length, | |
167 | 1/*violate_ro*/); | |
168 | TRACE(trace_gdb, ("sim_write(mem=0x%lx, buf=0x%lx, length=%d) = %d\n", | |
169 | (long)mem, (long)buf, length, result)); | |
170 | return result; | |
171 | } | |
172 | ||
173 | ||
174 | int | |
175 | sim_fetch_register (SIM_DESC sd, int regno, unsigned char *buf, int length) | |
176 | { | |
177 | char *regname; | |
178 | ||
179 | if (simulator == NULL) { | |
180 | return 0; | |
181 | } | |
182 | ||
183 | /* GDB will sometimes ask for the contents of a register named ""; | |
184 | we ignore such requests, and leave garbage in *BUF. In | |
185 | REG_NAMES, the empty string means "the register with this | |
186 | number is not present in the currently selected architecture | |
187 | variant." That's following the kludge we're using for the MIPS | |
188 | processors. But there are loops that just walk through the | |
189 | entire list of names and try to get everything. */ | |
190 | regname = REGISTER_NAME (regno); | |
191 | if (! regname || regname[0] == '\0') | |
192 | return -1; | |
193 | ||
194 | TRACE(trace_gdb, ("sim_fetch_register(regno=%d(%s), buf=0x%lx)\n", | |
195 | regno, regname, (long)buf)); | |
196 | psim_read_register(simulator, MAX_NR_PROCESSORS, | |
197 | buf, regname, raw_transfer); | |
198 | return -1; | |
199 | } | |
200 | ||
201 | ||
202 | int | |
203 | sim_store_register (SIM_DESC sd, int regno, unsigned char *buf, int length) | |
204 | { | |
205 | char *regname; | |
206 | ||
207 | if (simulator == NULL) | |
208 | return 0; | |
209 | ||
210 | /* See comments in sim_fetch_register, above. */ | |
211 | regname = REGISTER_NAME (regno); | |
212 | if (! regname || regname[0] == '\0') | |
213 | return -1; | |
214 | ||
215 | TRACE(trace_gdb, ("sim_store_register(regno=%d(%s), buf=0x%lx)\n", | |
216 | regno, regname, (long)buf)); | |
217 | psim_write_register(simulator, MAX_NR_PROCESSORS, | |
218 | buf, regname, raw_transfer); | |
219 | return -1; | |
220 | } | |
221 | ||
222 | ||
223 | void | |
224 | sim_info (SIM_DESC sd, int verbose) | |
225 | { | |
226 | TRACE(trace_gdb, ("sim_info(verbose=%d) called\n", verbose)); | |
227 | psim_print_info (simulator, verbose); | |
228 | } | |
229 | ||
230 | ||
231 | SIM_RC | |
232 | sim_create_inferior (SIM_DESC sd, | |
233 | struct _bfd *abfd, | |
234 | char **argv, | |
235 | char **envp) | |
236 | { | |
237 | unsigned_word entry_point; | |
238 | TRACE(trace_gdb, ("sim_create_inferior(start_address=0x%x, ...)\n", | |
239 | entry_point)); | |
240 | ||
241 | if (simulator == NULL) | |
242 | error ("No program loaded"); | |
243 | ||
244 | if (abfd != NULL) | |
245 | entry_point = bfd_get_start_address (abfd); | |
246 | else | |
247 | entry_point = 0xfff00000; /* ??? */ | |
248 | ||
249 | psim_init(simulator); | |
250 | psim_stack(simulator, argv, envp); | |
251 | ||
252 | psim_write_register(simulator, -1 /* all start at same PC */, | |
253 | &entry_point, "pc", cooked_transfer); | |
254 | return SIM_RC_OK; | |
255 | } | |
256 | ||
257 | ||
258 | void | |
259 | sim_stop_reason (SIM_DESC sd, enum sim_stop *reason, int *sigrc) | |
260 | { | |
261 | psim_status status = psim_get_status(simulator); | |
262 | ||
263 | switch (status.reason) { | |
264 | case was_continuing: | |
265 | *reason = sim_stopped; | |
266 | if (status.signal == 0) | |
267 | *sigrc = SIGTRAP; | |
268 | else | |
269 | *sigrc = status.signal; | |
270 | break; | |
271 | case was_trap: | |
272 | *reason = sim_stopped; | |
273 | *sigrc = SIGTRAP; | |
274 | break; | |
275 | case was_exited: | |
276 | *reason = sim_exited; | |
277 | *sigrc = status.signal; | |
278 | break; | |
279 | case was_signalled: | |
280 | *reason = sim_signalled; | |
281 | *sigrc = status.signal; | |
282 | break; | |
283 | } | |
284 | ||
285 | TRACE(trace_gdb, ("sim_stop_reason(reason=0x%lx(%ld), sigrc=0x%lx(%ld))\n", | |
286 | (long)reason, (long)*reason, (long)sigrc, (long)*sigrc)); | |
287 | } | |
288 | ||
289 | ||
290 | ||
291 | /* Run (or resume) the program. */ | |
292 | ||
293 | int | |
294 | sim_stop (SIM_DESC sd) | |
295 | { | |
296 | psim_stop (simulator); | |
297 | return 1; | |
298 | } | |
299 | ||
300 | void | |
301 | sim_resume (SIM_DESC sd, int step, int siggnal) | |
302 | { | |
303 | TRACE(trace_gdb, ("sim_resume(step=%d, siggnal=%d)\n", | |
304 | step, siggnal)); | |
305 | ||
306 | if (step) | |
307 | { | |
308 | psim_step (simulator); | |
309 | } | |
310 | else | |
311 | { | |
312 | psim_run (simulator); | |
313 | } | |
314 | } | |
315 | ||
316 | void | |
317 | sim_do_command (SIM_DESC sd, char *cmd) | |
318 | { | |
319 | TRACE(trace_gdb, ("sim_do_commands(cmd=%s) called\n", | |
320 | cmd ? cmd : "(null)")); | |
321 | if (cmd != NULL) { | |
322 | char **argv = buildargv(cmd); | |
323 | psim_command(root_device, argv); | |
324 | freeargv(argv); | |
325 | } | |
326 | } | |
327 | ||
328 | ||
329 | /* Polling, if required */ | |
330 | ||
331 | void | |
332 | sim_io_poll_quit (void) | |
333 | { | |
7a292a7a | 334 | if (callbacks->poll_quit != NULL && poll_quit_count-- < 0) |
c906108c | 335 | { |
7a292a7a | 336 | poll_quit_count = POLL_QUIT_INTERVAL; |
c906108c SS |
337 | if (callbacks->poll_quit (callbacks)) |
338 | psim_stop (simulator); | |
339 | } | |
340 | } | |
341 | ||
342 | ||
343 | ||
344 | /* Map simulator IO operations onto the corresponding GDB I/O | |
345 | functions. | |
346 | ||
347 | NB: Only a limited subset of operations are mapped across. More | |
348 | advanced operations (such as dup or write) must either be mapped to | |
349 | one of the below calls or handled internally */ | |
350 | ||
351 | int | |
352 | sim_io_read_stdin(char *buf, | |
353 | int sizeof_buf) | |
354 | { | |
355 | switch (CURRENT_STDIO) { | |
356 | case DO_USE_STDIO: | |
357 | return callbacks->read_stdin(callbacks, buf, sizeof_buf); | |
358 | break; | |
359 | case DONT_USE_STDIO: | |
360 | return callbacks->read(callbacks, 0, buf, sizeof_buf); | |
361 | break; | |
362 | default: | |
363 | error("sim_io_read_stdin: unaccounted switch\n"); | |
364 | break; | |
365 | } | |
366 | return 0; | |
367 | } | |
368 | ||
369 | int | |
370 | sim_io_write_stdout(const char *buf, | |
371 | int sizeof_buf) | |
372 | { | |
373 | switch (CURRENT_STDIO) { | |
374 | case DO_USE_STDIO: | |
375 | return callbacks->write_stdout(callbacks, buf, sizeof_buf); | |
376 | break; | |
377 | case DONT_USE_STDIO: | |
378 | return callbacks->write(callbacks, 1, buf, sizeof_buf); | |
379 | break; | |
380 | default: | |
381 | error("sim_io_write_stdout: unaccounted switch\n"); | |
382 | break; | |
383 | } | |
384 | return 0; | |
385 | } | |
386 | ||
387 | int | |
388 | sim_io_write_stderr(const char *buf, | |
389 | int sizeof_buf) | |
390 | { | |
391 | switch (CURRENT_STDIO) { | |
392 | case DO_USE_STDIO: | |
393 | /* NB: I think there should be an explicit write_stderr callback */ | |
394 | return callbacks->write(callbacks, 3, buf, sizeof_buf); | |
395 | break; | |
396 | case DONT_USE_STDIO: | |
397 | return callbacks->write(callbacks, 3, buf, sizeof_buf); | |
398 | break; | |
399 | default: | |
400 | error("sim_io_write_stderr: unaccounted switch\n"); | |
401 | break; | |
402 | } | |
403 | return 0; | |
404 | } | |
405 | ||
406 | ||
407 | void | |
408 | sim_io_printf_filtered(const char *fmt, | |
409 | ...) | |
410 | { | |
411 | char message[1024]; | |
412 | va_list ap; | |
413 | /* format the message */ | |
414 | va_start(ap, fmt); | |
415 | vsprintf(message, fmt, ap); | |
416 | va_end(ap); | |
417 | /* sanity check */ | |
418 | if (strlen(message) >= sizeof(message)) | |
419 | error("sim_io_printf_filtered: buffer overflow\n"); | |
420 | callbacks->printf_filtered(callbacks, "%s", message); | |
421 | } | |
422 | ||
423 | void | |
424 | sim_io_flush_stdoutput(void) | |
425 | { | |
426 | switch (CURRENT_STDIO) { | |
427 | case DO_USE_STDIO: | |
428 | callbacks->flush_stdout (callbacks); | |
429 | break; | |
430 | case DONT_USE_STDIO: | |
431 | break; | |
432 | default: | |
433 | error("sim_io_read_stdin: unaccounted switch\n"); | |
434 | break; | |
435 | } | |
436 | } | |
437 | ||
438 | /****/ | |
439 | ||
440 | void * | |
441 | zalloc(long size) | |
442 | { | |
443 | void *memory = (void*)xmalloc(size); | |
444 | if (memory == NULL) | |
445 | error("xmalloc failed\n"); | |
446 | memset(memory, 0, size); | |
447 | return memory; | |
448 | } | |
449 | ||
450 | void zfree(void *data) | |
451 | { | |
452 | free(data); | |
453 | } |