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ed3ef339 DE |
1 | /* Support for connecting Guile's stdio to GDB's. |
2 | as well as r/w memory via ports. | |
3 | ||
32d0add0 | 4 | Copyright (C) 2014-2015 Free Software Foundation, Inc. |
ed3ef339 DE |
5 | |
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 3 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
20 | ||
21 | /* See README file in this directory for implementation notes, coding | |
22 | conventions, et.al. */ | |
23 | ||
24 | #include "defs.h" | |
25 | #include "gdb_select.h" | |
26 | #include "interps.h" | |
27 | #include "target.h" | |
28 | #include "guile-internal.h" | |
29 | ||
30 | #ifdef HAVE_POLL | |
31 | #if defined (HAVE_POLL_H) | |
32 | #include <poll.h> | |
33 | #elif defined (HAVE_SYS_POLL_H) | |
34 | #include <sys/poll.h> | |
35 | #endif | |
36 | #endif | |
37 | ||
38 | /* A ui-file for sending output to Guile. */ | |
39 | ||
40 | typedef struct | |
41 | { | |
42 | int *magic; | |
43 | SCM port; | |
44 | } ioscm_file_port; | |
45 | ||
46 | /* Data for a memory port. */ | |
47 | ||
48 | typedef struct | |
49 | { | |
50 | /* Bounds of memory range this port is allowed to access, inclusive. | |
51 | To simplify overflow handling, an END of 0xff..ff is not allowed. | |
52 | This also means a start address of 0xff..ff is also not allowed. | |
53 | I can live with that. */ | |
54 | CORE_ADDR start, end; | |
55 | ||
56 | /* (end - start + 1), recorded for convenience. */ | |
57 | ULONGEST size; | |
58 | ||
59 | /* Think of this as the lseek value maintained by the kernel. | |
60 | This value is always in the range [0, size]. */ | |
61 | ULONGEST current; | |
62 | ||
63 | /* The size of the internal r/w buffers. | |
64 | Scheme ports aren't a straightforward mapping to memory r/w. | |
65 | Generally the user specifies how much to r/w and all access is | |
66 | unbuffered. We don't try to provide equivalent access, but we allow | |
67 | the user to specify these values to help get something similar. */ | |
68 | unsigned read_buf_size, write_buf_size; | |
69 | } ioscm_memory_port; | |
70 | ||
71 | /* Copies of the original system input/output/error ports. | |
72 | These are recorded for debugging purposes. */ | |
73 | static SCM orig_input_port_scm; | |
74 | static SCM orig_output_port_scm; | |
75 | static SCM orig_error_port_scm; | |
76 | ||
77 | /* This is the stdio port descriptor, scm_ptob_descriptor. */ | |
78 | static scm_t_bits stdio_port_desc; | |
79 | ||
80 | /* Note: scm_make_port_type takes a char * instead of a const char *. */ | |
81 | static /*const*/ char stdio_port_desc_name[] = "gdb:stdio-port"; | |
82 | ||
83 | /* Names of each gdb port. */ | |
84 | static const char input_port_name[] = "gdb:stdin"; | |
85 | static const char output_port_name[] = "gdb:stdout"; | |
86 | static const char error_port_name[] = "gdb:stderr"; | |
87 | ||
88 | /* This is the actual port used from Guile. | |
89 | We don't expose these to the user though, to ensure they're not | |
90 | overwritten. */ | |
91 | static SCM input_port_scm; | |
92 | static SCM output_port_scm; | |
93 | static SCM error_port_scm; | |
94 | ||
95 | /* Magic number to identify port ui-files. | |
96 | Actually, the address of this variable is the magic number. */ | |
97 | static int file_port_magic; | |
98 | ||
99 | /* Internal enum for specifying output port. */ | |
100 | enum oport { GDB_STDOUT, GDB_STDERR }; | |
101 | ||
102 | /* This is the memory port descriptor, scm_ptob_descriptor. */ | |
103 | static scm_t_bits memory_port_desc; | |
104 | ||
105 | /* Note: scm_make_port_type takes a char * instead of a const char *. */ | |
106 | static /*const*/ char memory_port_desc_name[] = "gdb:memory-port"; | |
107 | ||
108 | /* The default amount of memory to fetch for each read/write request. | |
109 | Scheme ports don't provide a way to specify the size of a read, | |
110 | which is important to us to minimize the number of inferior interactions, | |
111 | which over a remote link can be important. To compensate we augment the | |
112 | port API with a new function that let's the user specify how much the next | |
113 | read request should fetch. This is the initial value for each new port. */ | |
114 | static const unsigned default_read_buf_size = 16; | |
115 | static const unsigned default_write_buf_size = 16; | |
116 | ||
117 | /* Arbitrarily limit memory port buffers to 1 byte to 4K. */ | |
118 | static const unsigned min_memory_port_buf_size = 1; | |
119 | static const unsigned max_memory_port_buf_size = 4096; | |
120 | ||
121 | /* "out of range" error message for buf sizes. */ | |
122 | static char *out_of_range_buf_size; | |
123 | ||
124 | /* Keywords used by open-memory. */ | |
125 | static SCM mode_keyword; | |
126 | static SCM start_keyword; | |
127 | static SCM size_keyword; | |
128 | \f | |
129 | /* Helper to do the low level work of opening a port. | |
130 | Newer versions of Guile (2.1.x) have scm_c_make_port. */ | |
131 | ||
132 | static SCM | |
133 | ioscm_open_port (scm_t_bits port_type, long mode_bits) | |
134 | { | |
135 | SCM port; | |
136 | ||
137 | #if 0 /* TODO: Guile doesn't export this. What to do? */ | |
138 | scm_i_scm_pthread_mutex_lock (&scm_i_port_table_mutex); | |
139 | #endif | |
140 | ||
141 | port = scm_new_port_table_entry (port_type); | |
142 | ||
143 | SCM_SET_CELL_TYPE (port, port_type | mode_bits); | |
144 | ||
145 | #if 0 /* TODO: Guile doesn't export this. What to do? */ | |
146 | scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex); | |
147 | #endif | |
148 | ||
149 | return port; | |
150 | } | |
151 | \f | |
152 | /* Support for connecting Guile's stdio ports to GDB's stdio ports. */ | |
153 | ||
154 | /* The scm_t_ptob_descriptor.input_waiting "method". | |
155 | Return a lower bound on the number of bytes available for input. */ | |
156 | ||
157 | static int | |
158 | ioscm_input_waiting (SCM port) | |
159 | { | |
160 | int fdes = 0; | |
161 | ||
162 | if (! scm_is_eq (port, input_port_scm)) | |
163 | return 0; | |
164 | ||
165 | #ifdef HAVE_POLL | |
166 | { | |
167 | /* This is copied from libguile/fports.c. */ | |
168 | struct pollfd pollfd = { fdes, POLLIN, 0 }; | |
169 | static int use_poll = -1; | |
170 | ||
171 | if (use_poll < 0) | |
172 | { | |
173 | /* This is copied from event-loop.c: poll cannot be used for stdin on | |
174 | m68k-motorola-sysv. */ | |
175 | struct pollfd test_pollfd = { fdes, POLLIN, 0 }; | |
176 | ||
177 | if (poll (&test_pollfd, 1, 0) == 1 && (test_pollfd.revents & POLLNVAL)) | |
178 | use_poll = 0; | |
179 | else | |
180 | use_poll = 1; | |
181 | } | |
182 | ||
183 | if (use_poll) | |
184 | { | |
185 | /* Guile doesn't export SIGINT hooks like Python does. | |
186 | For now pass EINTR to scm_syserror, that's what fports.c does. */ | |
187 | if (poll (&pollfd, 1, 0) < 0) | |
188 | scm_syserror (FUNC_NAME); | |
189 | ||
190 | return pollfd.revents & POLLIN ? 1 : 0; | |
191 | } | |
192 | } | |
193 | /* Fall through. */ | |
194 | #endif | |
195 | ||
196 | { | |
197 | struct timeval timeout; | |
198 | fd_set input_fds; | |
199 | int num_fds = fdes + 1; | |
200 | int num_found; | |
201 | ||
202 | memset (&timeout, 0, sizeof (timeout)); | |
203 | FD_ZERO (&input_fds); | |
204 | FD_SET (fdes, &input_fds); | |
205 | ||
206 | num_found = gdb_select (num_fds, &input_fds, NULL, NULL, &timeout); | |
207 | if (num_found < 0) | |
208 | { | |
209 | /* Guile doesn't export SIGINT hooks like Python does. | |
210 | For now pass EINTR to scm_syserror, that's what fports.c does. */ | |
211 | scm_syserror (FUNC_NAME); | |
212 | } | |
213 | return num_found > 0 && FD_ISSET (fdes, &input_fds); | |
214 | } | |
215 | } | |
216 | ||
217 | /* The scm_t_ptob_descriptor.fill_input "method". */ | |
218 | ||
219 | static int | |
220 | ioscm_fill_input (SCM port) | |
221 | { | |
222 | /* Borrowed from libguile/fports.c. */ | |
223 | long count; | |
224 | scm_t_port *pt = SCM_PTAB_ENTRY (port); | |
225 | ||
226 | /* If we're called on stdout,stderr, punt. */ | |
227 | if (! scm_is_eq (port, input_port_scm)) | |
228 | return (scm_t_wchar) EOF; /* Set errno and return -1? */ | |
229 | ||
230 | gdb_flush (gdb_stdout); | |
231 | gdb_flush (gdb_stderr); | |
232 | ||
233 | count = ui_file_read (gdb_stdin, (char *) pt->read_buf, pt->read_buf_size); | |
234 | if (count == -1) | |
235 | scm_syserror (FUNC_NAME); | |
236 | if (count == 0) | |
237 | return (scm_t_wchar) EOF; | |
238 | ||
239 | pt->read_pos = pt->read_buf; | |
240 | pt->read_end = pt->read_buf + count; | |
241 | return *pt->read_buf; | |
242 | } | |
243 | ||
244 | /* Like fputstrn_filtered, but don't escape characters, except nul. | |
245 | Also like fputs_filtered, but a length is specified. */ | |
246 | ||
247 | static void | |
248 | fputsn_filtered (const char *s, size_t size, struct ui_file *stream) | |
249 | { | |
250 | size_t i; | |
251 | ||
252 | for (i = 0; i < size; ++i) | |
253 | { | |
254 | if (s[i] == '\0') | |
255 | fputs_filtered ("\\000", stream); | |
256 | else | |
257 | fputc_filtered (s[i], stream); | |
258 | } | |
259 | } | |
260 | ||
261 | /* Write to gdb's stdout or stderr. */ | |
262 | ||
263 | static void | |
264 | ioscm_write (SCM port, const void *data, size_t size) | |
265 | { | |
ed3ef339 DE |
266 | |
267 | /* If we're called on stdin, punt. */ | |
268 | if (scm_is_eq (port, input_port_scm)) | |
269 | return; | |
270 | ||
492d29ea | 271 | TRY |
ed3ef339 DE |
272 | { |
273 | if (scm_is_eq (port, error_port_scm)) | |
274 | fputsn_filtered (data, size, gdb_stderr); | |
275 | else | |
276 | fputsn_filtered (data, size, gdb_stdout); | |
277 | } | |
492d29ea PA |
278 | CATCH (except, RETURN_MASK_ALL) |
279 | { | |
280 | GDBSCM_HANDLE_GDB_EXCEPTION (except); | |
281 | } | |
282 | END_CATCH | |
ed3ef339 DE |
283 | } |
284 | ||
285 | /* Flush gdb's stdout or stderr. */ | |
286 | ||
287 | static void | |
288 | ioscm_flush (SCM port) | |
289 | { | |
290 | /* If we're called on stdin, punt. */ | |
291 | if (scm_is_eq (port, input_port_scm)) | |
292 | return; | |
293 | ||
294 | if (scm_is_eq (port, error_port_scm)) | |
295 | gdb_flush (gdb_stderr); | |
296 | else | |
297 | gdb_flush (gdb_stdout); | |
298 | } | |
299 | ||
300 | /* Initialize the gdb stdio port type. | |
301 | ||
302 | N.B. isatty? will fail on these ports, it is only supported for file | |
303 | ports. IWBN if we could "subclass" file ports. */ | |
304 | ||
305 | static void | |
306 | ioscm_init_gdb_stdio_port (void) | |
307 | { | |
308 | stdio_port_desc = scm_make_port_type (stdio_port_desc_name, | |
309 | ioscm_fill_input, ioscm_write); | |
310 | ||
311 | scm_set_port_input_waiting (stdio_port_desc, ioscm_input_waiting); | |
312 | scm_set_port_flush (stdio_port_desc, ioscm_flush); | |
313 | } | |
314 | ||
315 | /* Subroutine of ioscm_make_gdb_stdio_port to simplify it. | |
316 | Set up the buffers of port PORT. | |
317 | MODE_BITS are the mode bits of PORT. */ | |
318 | ||
319 | static void | |
320 | ioscm_init_stdio_buffers (SCM port, long mode_bits) | |
321 | { | |
322 | scm_t_port *pt = SCM_PTAB_ENTRY (port); | |
323 | #define GDB_STDIO_BUFFER_DEFAULT_SIZE 1024 | |
324 | int size = mode_bits & SCM_BUF0 ? 0 : GDB_STDIO_BUFFER_DEFAULT_SIZE; | |
325 | int writing = (mode_bits & SCM_WRTNG) != 0; | |
326 | ||
327 | /* This is heavily copied from scm_fport_buffer_add. */ | |
328 | ||
329 | if (!writing && size > 0) | |
330 | { | |
331 | pt->read_buf = scm_gc_malloc_pointerless (size, "port buffer"); | |
332 | pt->read_pos = pt->read_end = pt->read_buf; | |
333 | pt->read_buf_size = size; | |
334 | } | |
335 | else | |
336 | { | |
337 | pt->read_pos = pt->read_buf = pt->read_end = &pt->shortbuf; | |
338 | pt->read_buf_size = 1; | |
339 | } | |
340 | ||
341 | if (writing && size > 0) | |
342 | { | |
343 | pt->write_buf = scm_gc_malloc_pointerless (size, "port buffer"); | |
344 | pt->write_pos = pt->write_buf; | |
345 | pt->write_buf_size = size; | |
346 | } | |
347 | else | |
348 | { | |
349 | pt->write_buf = pt->write_pos = &pt->shortbuf; | |
350 | pt->write_buf_size = 1; | |
351 | } | |
352 | pt->write_end = pt->write_buf + pt->write_buf_size; | |
353 | } | |
354 | ||
355 | /* Create a gdb stdio port. */ | |
356 | ||
357 | static SCM | |
358 | ioscm_make_gdb_stdio_port (int fd) | |
359 | { | |
360 | int is_a_tty = isatty (fd); | |
361 | const char *name; | |
362 | long mode_bits; | |
363 | SCM port; | |
364 | ||
365 | switch (fd) | |
366 | { | |
367 | case 0: | |
368 | name = input_port_name; | |
369 | mode_bits = scm_mode_bits (is_a_tty ? "r0" : "r"); | |
370 | break; | |
371 | case 1: | |
372 | name = output_port_name; | |
373 | mode_bits = scm_mode_bits (is_a_tty ? "w0" : "w"); | |
374 | break; | |
375 | case 2: | |
376 | name = error_port_name; | |
377 | mode_bits = scm_mode_bits (is_a_tty ? "w0" : "w"); | |
378 | break; | |
379 | default: | |
380 | gdb_assert_not_reached ("bad stdio file descriptor"); | |
381 | } | |
382 | ||
383 | port = ioscm_open_port (stdio_port_desc, mode_bits); | |
384 | ||
385 | scm_set_port_filename_x (port, gdbscm_scm_from_c_string (name)); | |
386 | ||
387 | ioscm_init_stdio_buffers (port, mode_bits); | |
388 | ||
389 | return port; | |
390 | } | |
391 | ||
392 | /* (stdio-port? object) -> boolean */ | |
393 | ||
394 | static SCM | |
395 | gdbscm_stdio_port_p (SCM scm) | |
396 | { | |
397 | /* This is copied from SCM_FPORTP. */ | |
398 | return scm_from_bool (!SCM_IMP (scm) | |
399 | && (SCM_TYP16 (scm) == stdio_port_desc)); | |
400 | } | |
401 | \f | |
402 | /* GDB's ports are accessed via functions to keep them read-only. */ | |
403 | ||
404 | /* (input-port) -> port */ | |
405 | ||
406 | static SCM | |
407 | gdbscm_input_port (void) | |
408 | { | |
409 | return input_port_scm; | |
410 | } | |
411 | ||
412 | /* (output-port) -> port */ | |
413 | ||
414 | static SCM | |
415 | gdbscm_output_port (void) | |
416 | { | |
417 | return output_port_scm; | |
418 | } | |
419 | ||
420 | /* (error-port) -> port */ | |
421 | ||
422 | static SCM | |
423 | gdbscm_error_port (void) | |
424 | { | |
425 | return error_port_scm; | |
426 | } | |
427 | \f | |
428 | /* Support for sending GDB I/O to Guile ports. */ | |
429 | ||
430 | static void | |
431 | ioscm_file_port_delete (struct ui_file *file) | |
432 | { | |
433 | ioscm_file_port *stream = ui_file_data (file); | |
434 | ||
435 | if (stream->magic != &file_port_magic) | |
436 | internal_error (__FILE__, __LINE__, | |
437 | _("ioscm_file_port_delete: bad magic number")); | |
438 | xfree (stream); | |
439 | } | |
440 | ||
441 | static void | |
442 | ioscm_file_port_rewind (struct ui_file *file) | |
443 | { | |
444 | ioscm_file_port *stream = ui_file_data (file); | |
445 | ||
446 | if (stream->magic != &file_port_magic) | |
447 | internal_error (__FILE__, __LINE__, | |
448 | _("ioscm_file_port_rewind: bad magic number")); | |
449 | ||
450 | scm_truncate_file (stream->port, 0); | |
451 | } | |
452 | ||
453 | static void | |
454 | ioscm_file_port_put (struct ui_file *file, | |
455 | ui_file_put_method_ftype *write, | |
456 | void *dest) | |
457 | { | |
458 | ioscm_file_port *stream = ui_file_data (file); | |
459 | ||
460 | if (stream->magic != &file_port_magic) | |
461 | internal_error (__FILE__, __LINE__, | |
462 | _("ioscm_file_port_put: bad magic number")); | |
463 | ||
464 | /* This function doesn't meld with ports very well. */ | |
465 | } | |
466 | ||
467 | static void | |
468 | ioscm_file_port_write (struct ui_file *file, | |
469 | const char *buffer, | |
470 | long length_buffer) | |
471 | { | |
472 | ioscm_file_port *stream = ui_file_data (file); | |
473 | ||
474 | if (stream->magic != &file_port_magic) | |
475 | internal_error (__FILE__, __LINE__, | |
476 | _("ioscm_pot_file_write: bad magic number")); | |
477 | ||
478 | scm_c_write (stream->port, buffer, length_buffer); | |
479 | } | |
480 | ||
481 | /* Return a ui_file that writes to PORT. */ | |
482 | ||
483 | static struct ui_file * | |
484 | ioscm_file_port_new (SCM port) | |
485 | { | |
486 | ioscm_file_port *stream = XCNEW (ioscm_file_port); | |
487 | struct ui_file *file = ui_file_new (); | |
488 | ||
489 | set_ui_file_data (file, stream, ioscm_file_port_delete); | |
490 | set_ui_file_rewind (file, ioscm_file_port_rewind); | |
491 | set_ui_file_put (file, ioscm_file_port_put); | |
492 | set_ui_file_write (file, ioscm_file_port_write); | |
493 | stream->magic = &file_port_magic; | |
494 | stream->port = port; | |
495 | ||
496 | return file; | |
497 | } | |
498 | \f | |
499 | /* Helper routine for with-{output,error}-to-port. */ | |
500 | ||
501 | static SCM | |
502 | ioscm_with_output_to_port_worker (SCM port, SCM thunk, enum oport oport, | |
503 | const char *func_name) | |
504 | { | |
505 | struct ui_file *port_file; | |
506 | struct cleanup *cleanups; | |
507 | SCM result; | |
508 | ||
509 | SCM_ASSERT_TYPE (gdbscm_is_true (scm_output_port_p (port)), port, | |
510 | SCM_ARG1, func_name, _("output port")); | |
511 | SCM_ASSERT_TYPE (gdbscm_is_true (scm_thunk_p (thunk)), thunk, | |
512 | SCM_ARG2, func_name, _("thunk")); | |
513 | ||
514 | cleanups = set_batch_flag_and_make_cleanup_restore_page_info (); | |
515 | ||
516 | make_cleanup_restore_integer (&interpreter_async); | |
517 | interpreter_async = 0; | |
518 | ||
519 | port_file = ioscm_file_port_new (port); | |
520 | ||
521 | make_cleanup_ui_file_delete (port_file); | |
522 | ||
523 | if (oport == GDB_STDERR) | |
524 | { | |
525 | make_cleanup_restore_ui_file (&gdb_stderr); | |
526 | gdb_stderr = port_file; | |
527 | } | |
528 | else | |
529 | { | |
530 | make_cleanup_restore_ui_file (&gdb_stdout); | |
531 | ||
532 | if (ui_out_redirect (current_uiout, port_file) < 0) | |
533 | warning (_("Current output protocol does not support redirection")); | |
534 | else | |
535 | make_cleanup_ui_out_redirect_pop (current_uiout); | |
536 | ||
537 | gdb_stdout = port_file; | |
538 | } | |
539 | ||
540 | result = gdbscm_safe_call_0 (thunk, NULL); | |
541 | ||
542 | do_cleanups (cleanups); | |
543 | ||
544 | if (gdbscm_is_exception (result)) | |
545 | gdbscm_throw (result); | |
546 | ||
547 | return result; | |
548 | } | |
549 | ||
550 | /* (%with-gdb-output-to-port port thunk) -> object | |
551 | This function is experimental. | |
552 | IWBN to not include "gdb" in the name, but it would collide with a standard | |
553 | procedure, and it's common to import the gdb module without a prefix. | |
554 | There are ways around this, but they're more cumbersome. | |
555 | ||
556 | This has % in the name because it's experimental, and we want the | |
557 | user-visible version to come from module (gdb experimental). */ | |
558 | ||
559 | static SCM | |
560 | gdbscm_percent_with_gdb_output_to_port (SCM port, SCM thunk) | |
561 | { | |
562 | return ioscm_with_output_to_port_worker (port, thunk, GDB_STDOUT, FUNC_NAME); | |
563 | } | |
564 | ||
565 | /* (%with-gdb-error-to-port port thunk) -> object | |
566 | This function is experimental. | |
567 | IWBN to not include "gdb" in the name, but it would collide with a standard | |
568 | procedure, and it's common to import the gdb module without a prefix. | |
569 | There are ways around this, but they're more cumbersome. | |
570 | ||
571 | This has % in the name because it's experimental, and we want the | |
572 | user-visible version to come from module (gdb experimental). */ | |
573 | ||
574 | static SCM | |
575 | gdbscm_percent_with_gdb_error_to_port (SCM port, SCM thunk) | |
576 | { | |
577 | return ioscm_with_output_to_port_worker (port, thunk, GDB_STDERR, FUNC_NAME); | |
578 | } | |
579 | \f | |
580 | /* Support for r/w memory via ports. */ | |
581 | ||
582 | /* Perform an "lseek" to OFFSET,WHENCE on memory port IOMEM. | |
583 | OFFSET must be in the range [0,size]. | |
584 | The result is non-zero for success, zero for failure. */ | |
585 | ||
586 | static int | |
587 | ioscm_lseek_address (ioscm_memory_port *iomem, LONGEST offset, int whence) | |
588 | { | |
589 | CORE_ADDR new_current; | |
590 | ||
591 | gdb_assert (iomem->current <= iomem->size); | |
592 | ||
593 | switch (whence) | |
594 | { | |
595 | case SEEK_CUR: | |
596 | /* Catch over/underflow. */ | |
597 | if ((offset < 0 && iomem->current + offset > iomem->current) | |
598 | || (offset >= 0 && iomem->current + offset < iomem->current)) | |
599 | return 0; | |
600 | new_current = iomem->current + offset; | |
601 | break; | |
602 | case SEEK_SET: | |
603 | new_current = offset; | |
604 | break; | |
605 | case SEEK_END: | |
606 | if (offset == 0) | |
607 | { | |
608 | new_current = iomem->size; | |
609 | break; | |
610 | } | |
611 | /* TODO: Not supported yet. */ | |
612 | return 0; | |
613 | default: | |
614 | return 0; | |
615 | } | |
616 | ||
617 | if (new_current > iomem->size) | |
618 | return 0; | |
619 | iomem->current = new_current; | |
620 | return 1; | |
621 | } | |
622 | ||
623 | /* "fill_input" method for memory ports. */ | |
624 | ||
625 | static int | |
626 | gdbscm_memory_port_fill_input (SCM port) | |
627 | { | |
628 | scm_t_port *pt = SCM_PTAB_ENTRY (port); | |
629 | ioscm_memory_port *iomem = (ioscm_memory_port *) SCM_STREAM (port); | |
630 | size_t to_read; | |
631 | ||
632 | /* "current" is the offset of the first byte we want to read. */ | |
633 | if (iomem->current >= iomem->size) | |
634 | return EOF; | |
635 | ||
636 | /* Don't read outside the allowed memory range. */ | |
637 | to_read = pt->read_buf_size; | |
638 | if (to_read > iomem->size - iomem->current) | |
639 | to_read = iomem->size - iomem->current; | |
640 | ||
641 | if (target_read_memory (iomem->start + iomem->current, pt->read_buf, | |
642 | to_read) != 0) | |
643 | gdbscm_memory_error (FUNC_NAME, _("error reading memory"), SCM_EOL); | |
644 | ||
645 | pt->read_pos = pt->read_buf; | |
646 | pt->read_end = pt->read_buf + to_read; | |
647 | iomem->current += to_read; | |
648 | return *pt->read_buf; | |
649 | } | |
650 | ||
651 | /* "end_input" method for memory ports. | |
652 | Clear the read buffer and adjust the file position for unread bytes. */ | |
653 | ||
654 | static void | |
655 | gdbscm_memory_port_end_input (SCM port, int offset) | |
656 | { | |
657 | scm_t_port *pt = SCM_PTAB_ENTRY (port); | |
658 | ioscm_memory_port *iomem = (ioscm_memory_port *) SCM_STREAM (port); | |
659 | size_t remaining = pt->read_end - pt->read_pos; | |
660 | ||
661 | /* Note: Use of "int offset" is specified by Guile ports API. */ | |
662 | if ((offset < 0 && remaining + offset > remaining) | |
663 | || (offset > 0 && remaining + offset < remaining)) | |
664 | { | |
665 | gdbscm_out_of_range_error (FUNC_NAME, 0, scm_from_int (offset), | |
666 | _("overflow in offset calculation")); | |
667 | } | |
668 | offset += remaining; | |
669 | ||
670 | if (offset > 0) | |
671 | { | |
672 | pt->read_pos = pt->read_end; | |
673 | /* Throw error if unread-char used at beginning of file | |
674 | then attempting to write. Seems correct. */ | |
675 | if (!ioscm_lseek_address (iomem, -offset, SEEK_CUR)) | |
676 | { | |
677 | gdbscm_out_of_range_error (FUNC_NAME, 0, scm_from_int (offset), | |
678 | _("bad offset")); | |
679 | } | |
680 | } | |
681 | ||
682 | pt->rw_active = SCM_PORT_NEITHER; | |
683 | } | |
684 | ||
685 | /* "flush" method for memory ports. */ | |
686 | ||
687 | static void | |
688 | gdbscm_memory_port_flush (SCM port) | |
689 | { | |
690 | scm_t_port *pt = SCM_PTAB_ENTRY (port); | |
691 | ioscm_memory_port *iomem = (ioscm_memory_port *) SCM_STREAM (port); | |
692 | size_t to_write = pt->write_pos - pt->write_buf; | |
693 | ||
694 | if (to_write == 0) | |
695 | return; | |
696 | ||
697 | /* There's no way to indicate a short write, so if the request goes past | |
698 | the end of the port's memory range, flag an error. */ | |
699 | if (to_write > iomem->size - iomem->current) | |
700 | { | |
701 | gdbscm_out_of_range_error (FUNC_NAME, 0, | |
702 | gdbscm_scm_from_ulongest (to_write), | |
703 | _("writing beyond end of memory range")); | |
704 | } | |
705 | ||
706 | if (target_write_memory (iomem->start + iomem->current, pt->write_buf, | |
707 | to_write) != 0) | |
708 | gdbscm_memory_error (FUNC_NAME, _("error writing memory"), SCM_EOL); | |
709 | ||
710 | iomem->current += to_write; | |
711 | pt->write_pos = pt->write_buf; | |
712 | pt->rw_active = SCM_PORT_NEITHER; | |
713 | } | |
714 | ||
715 | /* "write" method for memory ports. */ | |
716 | ||
717 | static void | |
718 | gdbscm_memory_port_write (SCM port, const void *data, size_t size) | |
719 | { | |
720 | scm_t_port *pt = SCM_PTAB_ENTRY (port); | |
721 | ioscm_memory_port *iomem = (ioscm_memory_port *) SCM_STREAM (port); | |
722 | const char *input = (char *) data; | |
723 | ||
724 | /* We could get fancy here, and try to buffer the request since we're | |
725 | buffering anyway. But there's currently no need. */ | |
726 | ||
727 | /* First flush what's currently buffered. */ | |
728 | gdbscm_memory_port_flush (port); | |
729 | ||
730 | /* There's no way to indicate a short write, so if the request goes past | |
731 | the end of the port's memory range, flag an error. */ | |
732 | if (size > iomem->size - iomem->current) | |
733 | { | |
734 | gdbscm_out_of_range_error (FUNC_NAME, 0, gdbscm_scm_from_ulongest (size), | |
735 | _("writing beyond end of memory range")); | |
736 | } | |
737 | ||
738 | if (target_write_memory (iomem->start + iomem->current, data, size) != 0) | |
739 | gdbscm_memory_error (FUNC_NAME, _("error writing memory"), SCM_EOL); | |
740 | ||
741 | iomem->current += size; | |
742 | } | |
743 | ||
744 | /* "seek" method for memory ports. */ | |
745 | ||
746 | static scm_t_off | |
747 | gdbscm_memory_port_seek (SCM port, scm_t_off offset, int whence) | |
748 | { | |
749 | scm_t_port *pt = SCM_PTAB_ENTRY (port); | |
750 | ioscm_memory_port *iomem = (ioscm_memory_port *) SCM_STREAM (port); | |
751 | CORE_ADDR result; | |
752 | int rc; | |
753 | ||
754 | if (pt->rw_active == SCM_PORT_WRITE) | |
755 | { | |
756 | if (offset != 0 || whence != SEEK_CUR) | |
757 | { | |
758 | gdbscm_memory_port_flush (port); | |
759 | rc = ioscm_lseek_address (iomem, offset, whence); | |
760 | result = iomem->current; | |
761 | } | |
762 | else | |
763 | { | |
764 | /* Read current position without disturbing the buffer, | |
765 | but flag an error if what's in the buffer goes outside the | |
766 | allowed range. */ | |
767 | CORE_ADDR current = iomem->current; | |
768 | size_t delta = pt->write_pos - pt->write_buf; | |
769 | ||
770 | if (current + delta < current | |
771 | || current + delta > iomem->size + 1) | |
772 | rc = 0; | |
773 | else | |
774 | { | |
775 | result = current + delta; | |
776 | rc = 1; | |
777 | } | |
778 | } | |
779 | } | |
780 | else if (pt->rw_active == SCM_PORT_READ) | |
781 | { | |
782 | if (offset != 0 || whence != SEEK_CUR) | |
783 | { | |
784 | scm_end_input (port); | |
785 | rc = ioscm_lseek_address (iomem, offset, whence); | |
786 | result = iomem->current; | |
787 | } | |
788 | else | |
789 | { | |
790 | /* Read current position without disturbing the buffer | |
791 | (particularly the unread-char buffer). */ | |
792 | CORE_ADDR current = iomem->current; | |
793 | size_t remaining = pt->read_end - pt->read_pos; | |
794 | ||
795 | if (current - remaining > current | |
796 | || current - remaining < iomem->start) | |
797 | rc = 0; | |
798 | else | |
799 | { | |
800 | result = current - remaining; | |
801 | rc = 1; | |
802 | } | |
803 | ||
804 | if (rc != 0 && pt->read_buf == pt->putback_buf) | |
805 | { | |
806 | size_t saved_remaining = pt->saved_read_end - pt->saved_read_pos; | |
807 | ||
808 | if (result - saved_remaining > result | |
809 | || result - saved_remaining < iomem->start) | |
810 | rc = 0; | |
811 | else | |
812 | result -= saved_remaining; | |
813 | } | |
814 | } | |
815 | } | |
816 | else /* SCM_PORT_NEITHER */ | |
817 | { | |
818 | rc = ioscm_lseek_address (iomem, offset, whence); | |
819 | result = iomem->current; | |
820 | } | |
821 | ||
822 | if (rc == 0) | |
823 | { | |
824 | gdbscm_out_of_range_error (FUNC_NAME, 0, | |
825 | gdbscm_scm_from_longest (offset), | |
826 | _("bad seek")); | |
827 | } | |
828 | ||
829 | /* TODO: The Guile API doesn't support 32x64. We can't fix that here, | |
830 | and there's no need to throw an error if the new address can't be | |
831 | represented in a scm_t_off. But we could return something less | |
832 | clumsy. */ | |
833 | return result; | |
834 | } | |
835 | ||
836 | /* "close" method for memory ports. */ | |
837 | ||
838 | static int | |
839 | gdbscm_memory_port_close (SCM port) | |
840 | { | |
841 | scm_t_port *pt = SCM_PTAB_ENTRY (port); | |
842 | ioscm_memory_port *iomem = (ioscm_memory_port *) SCM_STREAM (port); | |
843 | ||
844 | gdbscm_memory_port_flush (port); | |
845 | ||
846 | if (pt->read_buf == pt->putback_buf) | |
847 | pt->read_buf = pt->saved_read_buf; | |
848 | xfree (pt->read_buf); | |
849 | xfree (pt->write_buf); | |
850 | scm_gc_free (iomem, sizeof (*iomem), "memory port"); | |
851 | ||
852 | return 0; | |
853 | } | |
854 | ||
855 | /* "free" method for memory ports. */ | |
856 | ||
857 | static size_t | |
858 | gdbscm_memory_port_free (SCM port) | |
859 | { | |
860 | gdbscm_memory_port_close (port); | |
861 | ||
862 | return 0; | |
863 | } | |
864 | ||
865 | /* "print" method for memory ports. */ | |
866 | ||
867 | static int | |
868 | gdbscm_memory_port_print (SCM exp, SCM port, scm_print_state *pstate) | |
869 | { | |
870 | ioscm_memory_port *iomem = (ioscm_memory_port *) SCM_STREAM (exp); | |
871 | char *type = SCM_PTOBNAME (SCM_PTOBNUM (exp)); | |
872 | ||
873 | scm_puts ("#<", port); | |
874 | scm_print_port_mode (exp, port); | |
875 | /* scm_print_port_mode includes a trailing space. */ | |
876 | gdbscm_printf (port, "%s %s-%s", type, | |
877 | hex_string (iomem->start), hex_string (iomem->end)); | |
878 | scm_putc ('>', port); | |
879 | return 1; | |
880 | } | |
881 | ||
882 | /* Create the port type used for memory. */ | |
883 | ||
884 | static void | |
885 | ioscm_init_memory_port_type (void) | |
886 | { | |
887 | memory_port_desc = scm_make_port_type (memory_port_desc_name, | |
888 | gdbscm_memory_port_fill_input, | |
889 | gdbscm_memory_port_write); | |
890 | ||
891 | scm_set_port_end_input (memory_port_desc, gdbscm_memory_port_end_input); | |
892 | scm_set_port_flush (memory_port_desc, gdbscm_memory_port_flush); | |
893 | scm_set_port_seek (memory_port_desc, gdbscm_memory_port_seek); | |
894 | scm_set_port_close (memory_port_desc, gdbscm_memory_port_close); | |
895 | scm_set_port_free (memory_port_desc, gdbscm_memory_port_free); | |
896 | scm_set_port_print (memory_port_desc, gdbscm_memory_port_print); | |
897 | } | |
898 | ||
899 | /* Helper for gdbscm_open_memory to parse the mode bits. | |
900 | An exception is thrown if MODE is invalid. */ | |
901 | ||
902 | static long | |
903 | ioscm_parse_mode_bits (const char *func_name, const char *mode) | |
904 | { | |
905 | const char *p; | |
906 | long mode_bits; | |
907 | ||
908 | if (*mode != 'r' && *mode != 'w') | |
909 | { | |
910 | gdbscm_out_of_range_error (func_name, 0, | |
911 | gdbscm_scm_from_c_string (mode), | |
912 | _("bad mode string")); | |
913 | } | |
914 | for (p = mode + 1; *p != '\0'; ++p) | |
915 | { | |
916 | switch (*p) | |
917 | { | |
918 | case 'b': | |
919 | case '+': | |
920 | break; | |
921 | default: | |
922 | gdbscm_out_of_range_error (func_name, 0, | |
923 | gdbscm_scm_from_c_string (mode), | |
924 | _("bad mode string")); | |
925 | } | |
926 | } | |
927 | ||
928 | /* Kinda awkward to convert the mode from SCM -> string only to have Guile | |
929 | convert it back to SCM, but that's the API we have to work with. */ | |
930 | mode_bits = scm_mode_bits ((char *) mode); | |
931 | ||
932 | return mode_bits; | |
933 | } | |
934 | ||
935 | /* Helper for gdbscm_open_memory to finish initializing the port. | |
936 | The port has address range [start,end]. | |
937 | To simplify overflow handling, an END of 0xff..ff is not allowed. | |
938 | This also means a start address of 0xff..f is also not allowed. | |
939 | I can live with that. */ | |
940 | ||
941 | static void | |
942 | ioscm_init_memory_port (SCM port, CORE_ADDR start, CORE_ADDR end) | |
943 | { | |
944 | scm_t_port *pt; | |
945 | ioscm_memory_port *iomem; | |
946 | ||
947 | gdb_assert (start <= end); | |
948 | gdb_assert (end < ~(CORE_ADDR) 0); | |
949 | ||
950 | iomem = (ioscm_memory_port *) scm_gc_malloc_pointerless (sizeof (*iomem), | |
951 | "memory port"); | |
952 | ||
953 | iomem->start = start; | |
954 | iomem->end = end; | |
955 | iomem->size = end - start + 1; | |
956 | iomem->current = 0; | |
957 | iomem->read_buf_size = default_read_buf_size; | |
958 | iomem->write_buf_size = default_write_buf_size; | |
959 | ||
960 | pt = SCM_PTAB_ENTRY (port); | |
961 | /* Match the expectation of `binary-port?'. */ | |
962 | pt->encoding = NULL; | |
963 | pt->rw_random = 1; | |
964 | pt->read_buf_size = iomem->read_buf_size; | |
965 | pt->read_buf = xmalloc (pt->read_buf_size); | |
966 | pt->read_pos = pt->read_end = pt->read_buf; | |
967 | pt->write_buf_size = iomem->write_buf_size; | |
968 | pt->write_buf = xmalloc (pt->write_buf_size); | |
969 | pt->write_pos = pt->write_buf; | |
970 | pt->write_end = pt->write_buf + pt->write_buf_size; | |
971 | ||
972 | SCM_SETSTREAM (port, iomem); | |
973 | } | |
974 | ||
975 | /* Re-initialize a memory port, updating its read/write buffer sizes. | |
976 | An exception is thrown if data is still buffered, except in the case | |
977 | where the buffer size isn't changing (since that's just a nop). */ | |
978 | ||
979 | static void | |
980 | ioscm_reinit_memory_port (SCM port, size_t read_buf_size, | |
981 | size_t write_buf_size, const char *func_name) | |
982 | { | |
983 | scm_t_port *pt = SCM_PTAB_ENTRY (port); | |
984 | ioscm_memory_port *iomem = (ioscm_memory_port *) SCM_STREAM (port); | |
985 | ||
986 | gdb_assert (read_buf_size >= min_memory_port_buf_size | |
987 | && read_buf_size <= max_memory_port_buf_size); | |
988 | gdb_assert (write_buf_size >= min_memory_port_buf_size | |
989 | && write_buf_size <= max_memory_port_buf_size); | |
990 | ||
991 | /* First check if anything is buffered. */ | |
992 | ||
993 | if (read_buf_size != pt->read_buf_size | |
994 | && pt->read_end != pt->read_buf) | |
995 | { | |
996 | scm_misc_error (func_name, _("read buffer not empty: ~a"), | |
997 | scm_list_1 (port)); | |
998 | } | |
999 | ||
1000 | if (write_buf_size != pt->write_buf_size | |
1001 | && pt->write_pos != pt->write_buf) | |
1002 | { | |
1003 | scm_misc_error (func_name, _("write buffer not empty: ~a"), | |
1004 | scm_list_1 (port)); | |
1005 | } | |
1006 | ||
1007 | /* Now we can update the buffer sizes, but only if the size has changed. */ | |
1008 | ||
1009 | if (read_buf_size != pt->read_buf_size) | |
1010 | { | |
1011 | iomem->read_buf_size = read_buf_size; | |
1012 | pt->read_buf_size = read_buf_size; | |
1013 | xfree (pt->read_buf); | |
1014 | pt->read_buf = xmalloc (pt->read_buf_size); | |
1015 | pt->read_pos = pt->read_end = pt->read_buf; | |
1016 | } | |
1017 | ||
1018 | if (write_buf_size != pt->write_buf_size) | |
1019 | { | |
1020 | iomem->write_buf_size = write_buf_size; | |
1021 | pt->write_buf_size = write_buf_size; | |
1022 | xfree (pt->write_buf); | |
1023 | pt->write_buf = xmalloc (pt->write_buf_size); | |
1024 | pt->write_pos = pt->write_buf; | |
1025 | pt->write_end = pt->write_buf + pt->write_buf_size; | |
1026 | } | |
1027 | } | |
1028 | ||
1029 | /* (open-memory [#:mode string] [#:start address] [#:size integer]) -> port | |
1030 | Return a port that can be used for reading and writing memory. | |
1031 | MODE is a string, and must be one of "r", "w", or "r+". | |
1032 | For compatibility "b" (binary) may also be present, but we ignore it: | |
1033 | memory ports are binary only. | |
1034 | ||
1035 | TODO: Support "0" (unbuffered)? Only support "0" (always unbuffered)? | |
1036 | ||
1037 | The chunk of memory that can be accessed can be bounded. | |
1038 | If both START,SIZE are unspecified, all of memory can be accessed. | |
1039 | If only START is specified, all of memory from that point on can be | |
1040 | accessed. If only SIZE if specified, all memory in [0,SIZE) can be | |
1041 | accessed. If both are specified, all memory in [START,START+SIZE) can be | |
1042 | accessed. | |
1043 | ||
1044 | Note: If it becomes useful enough we can later add #:end as an alternative | |
1045 | to #:size. For now it is left out. | |
1046 | ||
1047 | The result is a Scheme port, and its semantics are a bit odd for accessing | |
1048 | memory (e.g., unget), but we don't try to hide this. It's a port. | |
1049 | ||
1050 | N.B. Seeks on the port must be in the range [0,size). | |
1051 | This is for similarity with bytevector ports, and so that one can seek | |
1052 | to the first byte. */ | |
1053 | ||
1054 | static SCM | |
1055 | gdbscm_open_memory (SCM rest) | |
1056 | { | |
1057 | const SCM keywords[] = { | |
1058 | mode_keyword, start_keyword, size_keyword, SCM_BOOL_F | |
1059 | }; | |
1060 | char *mode = NULL; | |
1061 | CORE_ADDR start = 0; | |
1062 | CORE_ADDR end; | |
1063 | int mode_arg_pos = -1, start_arg_pos = -1, size_arg_pos = -1; | |
1064 | ULONGEST size; | |
1065 | SCM port; | |
1066 | long mode_bits; | |
1067 | ||
1068 | gdbscm_parse_function_args (FUNC_NAME, SCM_ARG1, keywords, "#sUU", rest, | |
1069 | &mode_arg_pos, &mode, | |
1070 | &start_arg_pos, &start, | |
1071 | &size_arg_pos, &size); | |
1072 | ||
1073 | scm_dynwind_begin (0); | |
1074 | ||
1075 | if (mode == NULL) | |
1076 | mode = xstrdup ("r"); | |
1077 | scm_dynwind_free (mode); | |
1078 | ||
1079 | if (start == ~(CORE_ADDR) 0) | |
1080 | { | |
1081 | gdbscm_out_of_range_error (FUNC_NAME, SCM_ARG1, scm_from_int (-1), | |
1082 | _("start address of 0xff..ff not allowed")); | |
1083 | } | |
1084 | ||
1085 | if (size_arg_pos > 0) | |
1086 | { | |
1087 | if (size == 0) | |
1088 | { | |
1089 | gdbscm_out_of_range_error (FUNC_NAME, 0, scm_from_int (0), | |
1090 | "zero size"); | |
1091 | } | |
1092 | /* For now be strict about start+size overflowing. If it becomes | |
1093 | a nuisance we can relax things later. */ | |
1094 | if (start + size < start) | |
1095 | { | |
1096 | gdbscm_out_of_range_error (FUNC_NAME, 0, | |
1097 | scm_list_2 (gdbscm_scm_from_ulongest (start), | |
1098 | gdbscm_scm_from_ulongest (size)), | |
1099 | _("start+size overflows")); | |
1100 | } | |
1101 | end = start + size - 1; | |
1102 | if (end == ~(CORE_ADDR) 0) | |
1103 | { | |
1104 | gdbscm_out_of_range_error (FUNC_NAME, 0, | |
1105 | scm_list_2 (gdbscm_scm_from_ulongest (start), | |
1106 | gdbscm_scm_from_ulongest (size)), | |
1107 | _("end address of 0xff..ff not allowed")); | |
1108 | } | |
1109 | } | |
1110 | else | |
1111 | end = (~(CORE_ADDR) 0) - 1; | |
1112 | ||
1113 | mode_bits = ioscm_parse_mode_bits (FUNC_NAME, mode); | |
1114 | ||
1115 | port = ioscm_open_port (memory_port_desc, mode_bits); | |
1116 | ||
1117 | ioscm_init_memory_port (port, start, end); | |
1118 | ||
1119 | scm_dynwind_end (); | |
1120 | ||
1121 | /* TODO: Set the file name as "memory-start-end"? */ | |
1122 | return port; | |
1123 | } | |
1124 | ||
1125 | /* Return non-zero if OBJ is a memory port. */ | |
1126 | ||
1127 | static int | |
1128 | gdbscm_is_memory_port (SCM obj) | |
1129 | { | |
1130 | return !SCM_IMP (obj) && (SCM_TYP16 (obj) == memory_port_desc); | |
1131 | } | |
1132 | ||
1133 | /* (memory-port? obj) -> boolean */ | |
1134 | ||
1135 | static SCM | |
1136 | gdbscm_memory_port_p (SCM obj) | |
1137 | { | |
1138 | return scm_from_bool (gdbscm_is_memory_port (obj)); | |
1139 | } | |
1140 | ||
1141 | /* (memory-port-range port) -> (start end) */ | |
1142 | ||
1143 | static SCM | |
1144 | gdbscm_memory_port_range (SCM port) | |
1145 | { | |
1146 | ioscm_memory_port *iomem; | |
1147 | ||
1148 | SCM_ASSERT_TYPE (gdbscm_is_memory_port (port), port, SCM_ARG1, FUNC_NAME, | |
1149 | memory_port_desc_name); | |
1150 | ||
1151 | iomem = (ioscm_memory_port *) SCM_STREAM (port); | |
1152 | return scm_list_2 (gdbscm_scm_from_ulongest (iomem->start), | |
1153 | gdbscm_scm_from_ulongest (iomem->end)); | |
1154 | } | |
1155 | ||
1156 | /* (memory-port-read-buffer-size port) -> integer */ | |
1157 | ||
1158 | static SCM | |
1159 | gdbscm_memory_port_read_buffer_size (SCM port) | |
1160 | { | |
1161 | ioscm_memory_port *iomem; | |
1162 | ||
1163 | SCM_ASSERT_TYPE (gdbscm_is_memory_port (port), port, SCM_ARG1, FUNC_NAME, | |
1164 | memory_port_desc_name); | |
1165 | ||
1166 | iomem = (ioscm_memory_port *) SCM_STREAM (port); | |
1167 | return scm_from_uint (iomem->read_buf_size); | |
1168 | } | |
1169 | ||
1170 | /* (set-memory-port-read-buffer-size! port size) -> unspecified | |
1171 | An exception is thrown if read data is still buffered. */ | |
1172 | ||
1173 | static SCM | |
1174 | gdbscm_set_memory_port_read_buffer_size_x (SCM port, SCM size) | |
1175 | { | |
1176 | ioscm_memory_port *iomem; | |
1177 | ||
1178 | SCM_ASSERT_TYPE (gdbscm_is_memory_port (port), port, SCM_ARG1, FUNC_NAME, | |
1179 | memory_port_desc_name); | |
1180 | SCM_ASSERT_TYPE (scm_is_integer (size), size, SCM_ARG2, FUNC_NAME, | |
1181 | _("integer")); | |
1182 | ||
1183 | if (!scm_is_unsigned_integer (size, min_memory_port_buf_size, | |
1184 | max_memory_port_buf_size)) | |
1185 | { | |
1186 | gdbscm_out_of_range_error (FUNC_NAME, SCM_ARG2, size, | |
1187 | out_of_range_buf_size); | |
1188 | } | |
1189 | ||
1190 | iomem = (ioscm_memory_port *) SCM_STREAM (port); | |
1191 | ioscm_reinit_memory_port (port, scm_to_uint (size), iomem->write_buf_size, | |
1192 | FUNC_NAME); | |
1193 | ||
1194 | return SCM_UNSPECIFIED; | |
1195 | } | |
1196 | ||
1197 | /* (memory-port-write-buffer-size port) -> integer */ | |
1198 | ||
1199 | static SCM | |
1200 | gdbscm_memory_port_write_buffer_size (SCM port) | |
1201 | { | |
1202 | ioscm_memory_port *iomem; | |
1203 | ||
1204 | SCM_ASSERT_TYPE (gdbscm_is_memory_port (port), port, SCM_ARG1, FUNC_NAME, | |
1205 | memory_port_desc_name); | |
1206 | ||
1207 | iomem = (ioscm_memory_port *) SCM_STREAM (port); | |
1208 | return scm_from_uint (iomem->write_buf_size); | |
1209 | } | |
1210 | ||
1211 | /* (set-memory-port-write-buffer-size! port size) -> unspecified | |
1212 | An exception is thrown if write data is still buffered. */ | |
1213 | ||
1214 | static SCM | |
1215 | gdbscm_set_memory_port_write_buffer_size_x (SCM port, SCM size) | |
1216 | { | |
1217 | ioscm_memory_port *iomem; | |
1218 | ||
1219 | SCM_ASSERT_TYPE (gdbscm_is_memory_port (port), port, SCM_ARG1, FUNC_NAME, | |
1220 | memory_port_desc_name); | |
1221 | SCM_ASSERT_TYPE (scm_is_integer (size), size, SCM_ARG2, FUNC_NAME, | |
1222 | _("integer")); | |
1223 | ||
1224 | if (!scm_is_unsigned_integer (size, min_memory_port_buf_size, | |
1225 | max_memory_port_buf_size)) | |
1226 | { | |
1227 | gdbscm_out_of_range_error (FUNC_NAME, SCM_ARG2, size, | |
1228 | out_of_range_buf_size); | |
1229 | } | |
1230 | ||
1231 | iomem = (ioscm_memory_port *) SCM_STREAM (port); | |
1232 | ioscm_reinit_memory_port (port, iomem->read_buf_size, scm_to_uint (size), | |
1233 | FUNC_NAME); | |
1234 | ||
1235 | return SCM_UNSPECIFIED; | |
1236 | } | |
1237 | \f | |
1238 | /* Initialize gdb ports. */ | |
1239 | ||
1240 | static const scheme_function port_functions[] = | |
1241 | { | |
1242 | { "input-port", 0, 0, 0, gdbscm_input_port, | |
1243 | "\ | |
1244 | Return gdb's input port." }, | |
1245 | ||
1246 | { "output-port", 0, 0, 0, gdbscm_output_port, | |
1247 | "\ | |
1248 | Return gdb's output port." }, | |
1249 | ||
1250 | { "error-port", 0, 0, 0, gdbscm_error_port, | |
1251 | "\ | |
1252 | Return gdb's error port." }, | |
1253 | ||
1254 | { "stdio-port?", 1, 0, 0, gdbscm_stdio_port_p, | |
1255 | "\ | |
1256 | Return #t if the object is a gdb:stdio-port." }, | |
1257 | ||
1258 | { "open-memory", 0, 0, 1, gdbscm_open_memory, | |
1259 | "\ | |
1260 | Return a port that can be used for reading/writing inferior memory.\n\ | |
1261 | \n\ | |
1262 | Arguments: [#:mode string] [#:start address] [#:size integer]\n\ | |
1263 | Returns: A port object." }, | |
1264 | ||
1265 | { "memory-port?", 1, 0, 0, gdbscm_memory_port_p, | |
1266 | "\ | |
1267 | Return #t if the object is a memory port." }, | |
1268 | ||
1269 | { "memory-port-range", 1, 0, 0, gdbscm_memory_port_range, | |
1270 | "\ | |
1271 | Return the memory range of the port as (start end)." }, | |
1272 | ||
1273 | { "memory-port-read-buffer-size", 1, 0, 0, | |
1274 | gdbscm_memory_port_read_buffer_size, | |
1275 | "\ | |
1276 | Return the size of the read buffer for the memory port." }, | |
1277 | ||
1278 | { "set-memory-port-read-buffer-size!", 2, 0, 0, | |
1279 | gdbscm_set_memory_port_read_buffer_size_x, | |
1280 | "\ | |
1281 | Set the size of the read buffer for the memory port.\n\ | |
1282 | \n\ | |
1283 | Arguments: port integer\n\ | |
1284 | Returns: unspecified." }, | |
1285 | ||
1286 | { "memory-port-write-buffer-size", 1, 0, 0, | |
1287 | gdbscm_memory_port_write_buffer_size, | |
1288 | "\ | |
1289 | Return the size of the write buffer for the memory port." }, | |
1290 | ||
1291 | { "set-memory-port-write-buffer-size!", 2, 0, 0, | |
1292 | gdbscm_set_memory_port_write_buffer_size_x, | |
1293 | "\ | |
1294 | Set the size of the write buffer for the memory port.\n\ | |
1295 | \n\ | |
1296 | Arguments: port integer\n\ | |
1297 | Returns: unspecified." }, | |
1298 | ||
1299 | END_FUNCTIONS | |
1300 | }; | |
1301 | ||
1302 | static const scheme_function private_port_functions[] = | |
1303 | { | |
1304 | #if 0 /* TODO */ | |
1305 | { "%with-gdb-input-from-port", 2, 0, 0, | |
1306 | gdbscm_percent_with_gdb_input_from_port, | |
1307 | "\ | |
1308 | Temporarily set GDB's input port to PORT and then invoke THUNK.\n\ | |
1309 | \n\ | |
1310 | Arguments: port thunk\n\ | |
1311 | Returns: The result of calling THUNK.\n\ | |
1312 | \n\ | |
1313 | This procedure is experimental." }, | |
1314 | #endif | |
1315 | ||
1316 | { "%with-gdb-output-to-port", 2, 0, 0, | |
1317 | gdbscm_percent_with_gdb_output_to_port, | |
1318 | "\ | |
1319 | Temporarily set GDB's output port to PORT and then invoke THUNK.\n\ | |
1320 | \n\ | |
1321 | Arguments: port thunk\n\ | |
1322 | Returns: The result of calling THUNK.\n\ | |
1323 | \n\ | |
1324 | This procedure is experimental." }, | |
1325 | ||
1326 | { "%with-gdb-error-to-port", 2, 0, 0, | |
1327 | gdbscm_percent_with_gdb_error_to_port, | |
1328 | "\ | |
1329 | Temporarily set GDB's error port to PORT and then invoke THUNK.\n\ | |
1330 | \n\ | |
1331 | Arguments: port thunk\n\ | |
1332 | Returns: The result of calling THUNK.\n\ | |
1333 | \n\ | |
1334 | This procedure is experimental." }, | |
1335 | ||
1336 | END_FUNCTIONS | |
1337 | }; | |
1338 | ||
1339 | void | |
1340 | gdbscm_initialize_ports (void) | |
1341 | { | |
1342 | /* Save the original stdio ports for debugging purposes. */ | |
1343 | ||
1344 | orig_input_port_scm = scm_current_input_port (); | |
1345 | orig_output_port_scm = scm_current_output_port (); | |
1346 | orig_error_port_scm = scm_current_error_port (); | |
1347 | ||
1348 | /* Set up the stdio ports. */ | |
1349 | ||
1350 | ioscm_init_gdb_stdio_port (); | |
1351 | input_port_scm = ioscm_make_gdb_stdio_port (0); | |
1352 | output_port_scm = ioscm_make_gdb_stdio_port (1); | |
1353 | error_port_scm = ioscm_make_gdb_stdio_port (2); | |
1354 | ||
1355 | /* Set up memory ports. */ | |
1356 | ||
1357 | ioscm_init_memory_port_type (); | |
1358 | ||
1359 | /* Install the accessor functions. */ | |
1360 | ||
1361 | gdbscm_define_functions (port_functions, 1); | |
1362 | gdbscm_define_functions (private_port_functions, 0); | |
1363 | ||
1364 | /* Keyword args for open-memory. */ | |
1365 | ||
1366 | mode_keyword = scm_from_latin1_keyword ("mode"); | |
1367 | start_keyword = scm_from_latin1_keyword ("start"); | |
1368 | size_keyword = scm_from_latin1_keyword ("size"); | |
1369 | ||
1370 | /* Error message text for "out of range" memory port buffer sizes. */ | |
1371 | ||
1372 | out_of_range_buf_size = xstrprintf ("size not between %u - %u", | |
1373 | min_memory_port_buf_size, | |
1374 | max_memory_port_buf_size); | |
1375 | } |