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target: espressif: apptrace: declare a local function as static
[openocd.git] / src / target / semihosting_common.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2
3 /***************************************************************************
4 * Copyright (C) 2018 by Liviu Ionescu *
5 * <ilg@livius.net> *
6 * *
7 * Copyright (C) 2018 by Marvell Technology Group Ltd. *
8 * Written by Nicolas Pitre <nico@marvell.com> *
9 * *
10 * Copyright (C) 2010 by Spencer Oliver *
11 * spen@spen-soft.co.uk *
12 * *
13 * Copyright (C) 2016 by Square, Inc. *
14 * Steven Stallion <stallion@squareup.com> *
15 ***************************************************************************/
16
17 /**
18 * @file
19 * Common ARM semihosting support.
20 *
21 * Semihosting enables code running on a target to use some of the I/O
22 * facilities on the host computer. The target application must be linked
23 * against a library that forwards operation requests by using an
24 * instruction trapped by the debugger.
25 *
26 * Details can be found in
27 * "Semihosting for AArch32 and AArch64, Release 2.0"
28 * https://static.docs.arm.com/100863/0200/semihosting.pdf
29 * from ARM Ltd.
30 */
31
32 #ifdef HAVE_CONFIG_H
33 #include "config.h"
34 #endif
35
36 #include "target.h"
37 #include "target_type.h"
38 #include "semihosting_common.h"
39
40 #include <helper/binarybuffer.h>
41 #include <helper/log.h>
42 #include <server/gdb_server.h>
43 #include <sys/stat.h>
44
45 /**
46 * It is not possible to use O_... flags defined in sys/stat.h because they
47 * are not guaranteed to match the values defined by the GDB Remote Protocol.
48 * See https://sourceware.org/gdb/onlinedocs/gdb/Open-Flags.html#Open-Flags
49 */
50 enum {
51 TARGET_O_RDONLY = 0x000,
52 TARGET_O_WRONLY = 0x001,
53 TARGET_O_RDWR = 0x002,
54 TARGET_O_APPEND = 0x008,
55 TARGET_O_CREAT = 0x200,
56 TARGET_O_TRUNC = 0x400,
57 /* O_EXCL=0x800 is not required in this implementation. */
58 };
59
60 /* GDB remote protocol does not differentiate between text and binary open modes. */
61 static const int open_gdb_modeflags[12] = {
62 TARGET_O_RDONLY,
63 TARGET_O_RDONLY,
64 TARGET_O_RDWR,
65 TARGET_O_RDWR,
66 TARGET_O_WRONLY | TARGET_O_CREAT | TARGET_O_TRUNC,
67 TARGET_O_WRONLY | TARGET_O_CREAT | TARGET_O_TRUNC,
68 TARGET_O_RDWR | TARGET_O_CREAT | TARGET_O_TRUNC,
69 TARGET_O_RDWR | TARGET_O_CREAT | TARGET_O_TRUNC,
70 TARGET_O_WRONLY | TARGET_O_CREAT | TARGET_O_APPEND,
71 TARGET_O_WRONLY | TARGET_O_CREAT | TARGET_O_APPEND,
72 TARGET_O_RDWR | TARGET_O_CREAT | TARGET_O_APPEND,
73 TARGET_O_RDWR | TARGET_O_CREAT | TARGET_O_APPEND
74 };
75
76 static const int open_host_modeflags[12] = {
77 O_RDONLY,
78 O_RDONLY | O_BINARY,
79 O_RDWR,
80 O_RDWR | O_BINARY,
81 O_WRONLY | O_CREAT | O_TRUNC,
82 O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
83 O_RDWR | O_CREAT | O_TRUNC,
84 O_RDWR | O_CREAT | O_TRUNC | O_BINARY,
85 O_WRONLY | O_CREAT | O_APPEND,
86 O_WRONLY | O_CREAT | O_APPEND | O_BINARY,
87 O_RDWR | O_CREAT | O_APPEND,
88 O_RDWR | O_CREAT | O_APPEND | O_BINARY
89 };
90
91 static int semihosting_common_fileio_info(struct target *target,
92 struct gdb_fileio_info *fileio_info);
93 static int semihosting_common_fileio_end(struct target *target, int result,
94 int fileio_errno, bool ctrl_c);
95
96 /**
97 * Initialize common semihosting support.
98 *
99 * @param target Pointer to the target to initialize.
100 * @param setup
101 * @param post_result
102 * @return An error status if there is a problem during initialization.
103 */
104 int semihosting_common_init(struct target *target, void *setup,
105 void *post_result)
106 {
107 LOG_DEBUG(" ");
108
109 target->fileio_info = malloc(sizeof(*target->fileio_info));
110 if (!target->fileio_info) {
111 LOG_ERROR("out of memory");
112 return ERROR_FAIL;
113 }
114 memset(target->fileio_info, 0, sizeof(*target->fileio_info));
115
116 struct semihosting *semihosting;
117 semihosting = malloc(sizeof(*target->semihosting));
118 if (!semihosting) {
119 LOG_ERROR("out of memory");
120 return ERROR_FAIL;
121 }
122
123 semihosting->is_active = false;
124 semihosting->redirect_cfg = SEMIHOSTING_REDIRECT_CFG_NONE;
125 semihosting->tcp_connection = NULL;
126 semihosting->stdin_fd = -1;
127 semihosting->stdout_fd = -1;
128 semihosting->stderr_fd = -1;
129 semihosting->is_fileio = false;
130 semihosting->hit_fileio = false;
131 semihosting->is_resumable = false;
132 semihosting->has_resumable_exit = false;
133 semihosting->word_size_bytes = 0;
134 semihosting->op = -1;
135 semihosting->param = 0;
136 semihosting->result = -1;
137 semihosting->sys_errno = -1;
138 semihosting->cmdline = NULL;
139 semihosting->basedir = NULL;
140
141 /* If possible, update it in setup(). */
142 semihosting->setup_time = clock();
143
144 semihosting->setup = setup;
145 semihosting->post_result = post_result;
146 semihosting->user_command_extension = NULL;
147
148 target->semihosting = semihosting;
149
150 target->type->get_gdb_fileio_info = semihosting_common_fileio_info;
151 target->type->gdb_fileio_end = semihosting_common_fileio_end;
152
153 return ERROR_OK;
154 }
155
156 struct semihosting_tcp_service {
157 struct semihosting *semihosting;
158 char *name;
159 int error;
160 };
161
162 static bool semihosting_is_redirected(struct semihosting *semihosting, int fd)
163 {
164 if (semihosting->redirect_cfg == SEMIHOSTING_REDIRECT_CFG_NONE)
165 return false;
166
167 bool is_read_op = false;
168
169 switch (semihosting->op) {
170 /* check debug semihosting operations: READC, WRITEC and WRITE0 */
171 case SEMIHOSTING_SYS_READC:
172 is_read_op = true;
173 /* fall through */
174 case SEMIHOSTING_SYS_WRITEC:
175 case SEMIHOSTING_SYS_WRITE0:
176 /* debug operations are redirected when CFG is either DEBUG or ALL */
177 if (semihosting->redirect_cfg == SEMIHOSTING_REDIRECT_CFG_STDIO)
178 return false;
179 break;
180
181 /* check stdio semihosting operations: READ and WRITE */
182 case SEMIHOSTING_SYS_READ:
183 is_read_op = true;
184 /* fall through */
185 case SEMIHOSTING_SYS_WRITE:
186 /* stdio operations are redirected when CFG is either STDIO or ALL */
187 if (semihosting->redirect_cfg == SEMIHOSTING_REDIRECT_CFG_DEBUG)
188 return false;
189 break;
190
191 default:
192 return false;
193 }
194
195 if (is_read_op)
196 return fd == semihosting->stdin_fd;
197
198 /* write operation */
199 return fd == semihosting->stdout_fd || fd == semihosting->stderr_fd;
200 }
201
202 static ssize_t semihosting_redirect_write(struct semihosting *semihosting, void *buf, int size)
203 {
204 if (!semihosting->tcp_connection) {
205 LOG_ERROR("No connected TCP client for semihosting");
206 semihosting->sys_errno = EBADF; /* Bad file number */
207 return -1;
208 }
209
210 struct semihosting_tcp_service *service = semihosting->tcp_connection->service->priv;
211
212 int retval = connection_write(semihosting->tcp_connection, buf, size);
213
214 if (retval < 0)
215 log_socket_error(service->name);
216
217 return retval;
218 }
219
220 static ssize_t semihosting_write(struct semihosting *semihosting, int fd, void *buf, int size)
221 {
222 if (semihosting_is_redirected(semihosting, fd))
223 return semihosting_redirect_write(semihosting, buf, size);
224
225 /* default write */
226 return write(fd, buf, size);
227 }
228
229 static ssize_t semihosting_redirect_read(struct semihosting *semihosting, void *buf, int size)
230 {
231 if (!semihosting->tcp_connection) {
232 LOG_ERROR("No connected TCP client for semihosting");
233 semihosting->sys_errno = EBADF; /* Bad file number */
234 return -1;
235 }
236
237 struct semihosting_tcp_service *service = semihosting->tcp_connection->service->priv;
238
239 service->error = ERROR_OK;
240 semihosting->tcp_connection->input_pending = true;
241
242 int retval = connection_read(semihosting->tcp_connection, buf, size);
243
244 if (retval <= 0)
245 service->error = ERROR_SERVER_REMOTE_CLOSED;
246
247 if (retval < 0)
248 log_socket_error(service->name);
249
250 semihosting->tcp_connection->input_pending = false;
251
252 return retval;
253 }
254
255 static inline int semihosting_putchar(struct semihosting *semihosting, int fd, int c)
256 {
257 if (semihosting_is_redirected(semihosting, fd))
258 return semihosting_redirect_write(semihosting, &c, 1);
259
260 /* default putchar */
261 return putchar(c);
262 }
263
264 static inline ssize_t semihosting_read(struct semihosting *semihosting, int fd, void *buf, int size)
265 {
266 if (semihosting_is_redirected(semihosting, fd))
267 return semihosting_redirect_read(semihosting, buf, size);
268
269 /* default read */
270 ssize_t result = read(fd, buf, size);
271 semihosting->sys_errno = errno;
272
273 return result;
274 }
275
276 static inline int semihosting_getchar(struct semihosting *semihosting, int fd)
277 {
278 if (semihosting_is_redirected(semihosting, fd)) {
279 unsigned char c;
280
281 if (semihosting_redirect_read(semihosting, &c, 1) > 0)
282 return c;
283
284 return EOF;
285 }
286
287 /* default getchar */
288 return getchar();
289 }
290
291 /**
292 * User operation parameter string storage buffer. Contains valid data when the
293 * TARGET_EVENT_SEMIHOSTING_USER_CMD_xxxxx event callbacks are running.
294 */
295 static char *semihosting_user_op_params;
296
297 /**
298 * Portable implementation of ARM semihosting calls.
299 * Performs the currently pending semihosting operation
300 * encoded in target->semihosting.
301 */
302 int semihosting_common(struct target *target)
303 {
304 struct semihosting *semihosting = target->semihosting;
305 if (!semihosting) {
306 /* Silently ignore if the semihosting field was not set. */
307 return ERROR_OK;
308 }
309
310 struct gdb_fileio_info *fileio_info = target->fileio_info;
311
312 /*
313 * By default return an error.
314 * The actual result must be set by each function
315 */
316 semihosting->result = -1;
317
318 /* Most operations are resumable, except the two exit calls. */
319 semihosting->is_resumable = true;
320
321 int retval;
322
323 /* Enough space to hold 4 long words. */
324 uint8_t fields[4*8];
325
326 LOG_DEBUG("op=0x%x, param=0x%" PRIx64, semihosting->op,
327 semihosting->param);
328
329 switch (semihosting->op) {
330
331 case SEMIHOSTING_SYS_CLOCK: /* 0x10 */
332 /*
333 * Returns the number of centiseconds (hundredths of a second)
334 * since the execution started.
335 *
336 * Values returned can be of limited use for some benchmarking
337 * purposes because of communication overhead or other
338 * agent-specific factors. For example, with a debug hardware
339 * unit the request is passed back to the host for execution.
340 * This can lead to unpredictable delays in transmission and
341 * process scheduling.
342 *
343 * Use this function to calculate time intervals, by calculating
344 * differences between intervals with and without the code
345 * sequence to be timed.
346 *
347 * Entry
348 * The PARAMETER REGISTER must contain 0. There are no other
349 * parameters.
350 *
351 * Return
352 * On exit, the RETURN REGISTER contains:
353 * - The number of centiseconds since some arbitrary start
354 * point, if the call is successful.
355 * - –1 if the call is not successful. For example, because
356 * of a communications error.
357 */
358 {
359 clock_t delta = clock() - semihosting->setup_time;
360
361 semihosting->result = delta / (CLOCKS_PER_SEC / 100);
362 }
363 break;
364
365 case SEMIHOSTING_SYS_CLOSE: /* 0x02 */
366 /*
367 * Closes a file on the host system. The handle must reference
368 * a file that was opened with SYS_OPEN.
369 *
370 * Entry
371 * On entry, the PARAMETER REGISTER contains a pointer to a
372 * one-field argument block:
373 * - field 1 Contains a handle for an open file.
374 *
375 * Return
376 * On exit, the RETURN REGISTER contains:
377 * - 0 if the call is successful
378 * - –1 if the call is not successful.
379 */
380 retval = semihosting_read_fields(target, 1, fields);
381 if (retval != ERROR_OK)
382 return retval;
383 else {
384 int fd = semihosting_get_field(target, 0, fields);
385 /* Do not allow to close OpenOCD's own standard streams */
386 if (fd == 0 || fd == 1 || fd == 2) {
387 LOG_DEBUG("ignoring semihosting attempt to close %s",
388 (fd == 0) ? "stdin" :
389 (fd == 1) ? "stdout" : "stderr");
390 /* Just pretend success */
391 if (semihosting->is_fileio) {
392 semihosting->result = 0;
393 } else {
394 semihosting->result = 0;
395 semihosting->sys_errno = 0;
396 }
397 break;
398 }
399 /* Close the descriptor */
400 if (semihosting->is_fileio) {
401 semihosting->hit_fileio = true;
402 fileio_info->identifier = "close";
403 fileio_info->param_1 = fd;
404 } else {
405 semihosting->result = close(fd);
406 semihosting->sys_errno = errno;
407 LOG_DEBUG("close(%d)=%" PRId64, fd, semihosting->result);
408 }
409 }
410 break;
411
412 case SEMIHOSTING_SYS_ERRNO: /* 0x13 */
413 /*
414 * Returns the value of the C library errno variable that is
415 * associated with the semihosting implementation. The errno
416 * variable can be set by a number of C library semihosted
417 * functions, including:
418 * - SYS_REMOVE
419 * - SYS_OPEN
420 * - SYS_CLOSE
421 * - SYS_READ
422 * - SYS_WRITE
423 * - SYS_SEEK.
424 *
425 * Whether errno is set or not, and to what value, is entirely
426 * host-specific, except where the ISO C standard defines the
427 * behavior.
428 *
429 * Entry
430 * There are no parameters. The PARAMETER REGISTER must be 0.
431 *
432 * Return
433 * On exit, the RETURN REGISTER contains the value of the C
434 * library errno variable.
435 */
436 semihosting->result = semihosting->sys_errno;
437 break;
438
439 case SEMIHOSTING_SYS_EXIT: /* 0x18 */
440 /*
441 * Note: SYS_EXIT was called angel_SWIreason_ReportException in
442 * previous versions of the documentation.
443 *
444 * An application calls this operation to report an exception
445 * to the debugger directly. The most common use is to report
446 * that execution has completed, using ADP_Stopped_ApplicationExit.
447 *
448 * Note: This semihosting operation provides no means for 32-bit
449 * callers to indicate an application exit with a specified exit
450 * code. Semihosting callers may prefer to check for the presence
451 * of the SH_EXT_EXTENDED_REPORT_EXCEPTION extension and use
452 * the SYS_REPORT_EXCEPTION_EXTENDED operation instead, if it
453 * is available.
454 *
455 * Entry (32-bit)
456 * On entry, the PARAMETER register is set to a reason code
457 * describing the cause of the trap. Not all semihosting client
458 * implementations will necessarily trap every corresponding
459 * event. Important reason codes are:
460 *
461 * - ADP_Stopped_ApplicationExit 0x20026
462 * - ADP_Stopped_RunTimeErrorUnknown 0x20023
463 *
464 * Entry (64-bit)
465 * On entry, the PARAMETER REGISTER contains a pointer to a
466 * two-field argument block:
467 * - field 1 The exception type, which is one of the set of
468 * reason codes in the above tables.
469 * - field 2 A subcode, whose meaning depends on the reason
470 * code in field 1.
471 * In particular, if field 1 is ADP_Stopped_ApplicationExit
472 * then field 2 is an exit status code, as passed to the C
473 * standard library exit() function. A simulator receiving
474 * this request must notify a connected debugger, if present,
475 * and then exit with the specified status.
476 *
477 * Return
478 * No return is expected from these calls. However, it is
479 * possible for the debugger to request that the application
480 * continues by performing an RDI_Execute request or equivalent.
481 * In this case, execution continues with the registers as they
482 * were on entry to the operation, or as subsequently modified
483 * by the debugger.
484 */
485 if (semihosting->word_size_bytes == 8) {
486 retval = semihosting_read_fields(target, 2, fields);
487 if (retval != ERROR_OK)
488 return retval;
489 else {
490 int type = semihosting_get_field(target, 0, fields);
491 int code = semihosting_get_field(target, 1, fields);
492
493 if (type == ADP_STOPPED_APPLICATION_EXIT) {
494 if (!gdb_get_actual_connections())
495 exit(code);
496 else {
497 fprintf(stderr,
498 "semihosting: *** application exited with %d ***\n",
499 code);
500 }
501 } else {
502 fprintf(stderr,
503 "semihosting: application exception %#x\n",
504 type);
505 }
506 }
507 } else {
508 if (semihosting->param == ADP_STOPPED_APPLICATION_EXIT) {
509 if (!gdb_get_actual_connections())
510 exit(0);
511 else {
512 fprintf(stderr,
513 "semihosting: *** application exited normally ***\n");
514 }
515 } else if (semihosting->param == ADP_STOPPED_RUN_TIME_ERROR) {
516 /* Chosen more or less arbitrarily to have a nicer message,
517 * otherwise all other return the same exit code 1. */
518 if (!gdb_get_actual_connections())
519 exit(1);
520 else {
521 fprintf(stderr,
522 "semihosting: *** application exited with error ***\n");
523 }
524 } else {
525 if (!gdb_get_actual_connections())
526 exit(1);
527 else {
528 fprintf(stderr,
529 "semihosting: application exception %#x\n",
530 (unsigned) semihosting->param);
531 }
532 }
533 }
534 if (!semihosting->has_resumable_exit) {
535 semihosting->is_resumable = false;
536 return target_call_event_callbacks(target, TARGET_EVENT_HALTED);
537 }
538 break;
539
540 case SEMIHOSTING_SYS_EXIT_EXTENDED: /* 0x20 */
541 /*
542 * This operation is only supported if the semihosting extension
543 * SH_EXT_EXIT_EXTENDED is implemented. SH_EXT_EXIT_EXTENDED is
544 * reported using feature byte 0, bit 0. If this extension is
545 * supported, then the implementation provides a means to
546 * report a normal exit with a nonzero exit status in both 32-bit
547 * and 64-bit semihosting APIs.
548 *
549 * The implementation must provide the semihosting call
550 * SYS_EXIT_EXTENDED for both A64 and A32/T32 semihosting APIs.
551 *
552 * SYS_EXIT_EXTENDED is used by an application to report an
553 * exception or exit to the debugger directly. The most common
554 * use is to report that execution has completed, using
555 * ADP_Stopped_ApplicationExit.
556 *
557 * Entry
558 * On entry, the PARAMETER REGISTER contains a pointer to a
559 * two-field argument block:
560 * - field 1 The exception type, which should be one of the set
561 * of reason codes that are documented for the SYS_EXIT
562 * (0x18) call. For example, ADP_Stopped_ApplicationExit.
563 * - field 2 A subcode, whose meaning depends on the reason
564 * code in field 1. In particular, if field 1 is
565 * ADP_Stopped_ApplicationExit then field 2 is an exit status
566 * code, as passed to the C standard library exit() function.
567 * A simulator receiving this request must notify a connected
568 * debugger, if present, and then exit with the specified status.
569 *
570 * Return
571 * No return is expected from these calls.
572 *
573 * For the A64 API, this call is identical to the behavior of
574 * the mandatory SYS_EXIT (0x18) call. If this extension is
575 * supported, then both calls must be implemented.
576 */
577 retval = semihosting_read_fields(target, 2, fields);
578 if (retval != ERROR_OK)
579 return retval;
580 else {
581 int type = semihosting_get_field(target, 0, fields);
582 int code = semihosting_get_field(target, 1, fields);
583
584 if (type == ADP_STOPPED_APPLICATION_EXIT) {
585 if (!gdb_get_actual_connections())
586 exit(code);
587 else {
588 fprintf(stderr,
589 "semihosting: *** application exited with %d ***\n",
590 code);
591 }
592 } else {
593 fprintf(stderr, "semihosting: exception %#x\n",
594 type);
595 }
596 }
597 if (!semihosting->has_resumable_exit) {
598 semihosting->is_resumable = false;
599 return target_call_event_callbacks(target, TARGET_EVENT_HALTED);
600 }
601 break;
602
603 case SEMIHOSTING_SYS_FLEN: /* 0x0C */
604 /*
605 * Returns the length of a specified file.
606 *
607 * Entry
608 * On entry, the PARAMETER REGISTER contains a pointer to a
609 * one-field argument block:
610 * - field 1 A handle for a previously opened, seekable file
611 * object.
612 *
613 * Return
614 * On exit, the RETURN REGISTER contains:
615 * - The current length of the file object, if the call is
616 * successful.
617 * - –1 if an error occurs.
618 */
619 if (semihosting->is_fileio) {
620 semihosting->result = -1;
621 semihosting->sys_errno = EINVAL;
622 }
623 retval = semihosting_read_fields(target, 1, fields);
624 if (retval != ERROR_OK)
625 return retval;
626 else {
627 int fd = semihosting_get_field(target, 0, fields);
628 struct stat buf;
629 semihosting->result = fstat(fd, &buf);
630 if (semihosting->result == -1) {
631 semihosting->sys_errno = errno;
632 LOG_DEBUG("fstat(%d)=%" PRId64, fd, semihosting->result);
633 break;
634 }
635 LOG_DEBUG("fstat(%d)=%" PRId64, fd, semihosting->result);
636 semihosting->result = buf.st_size;
637 }
638 break;
639
640 case SEMIHOSTING_SYS_GET_CMDLINE: /* 0x15 */
641 /*
642 * Returns the command line that is used for the call to the
643 * executable, that is, argc and argv.
644 *
645 * Entry
646 * On entry, the PARAMETER REGISTER points to a two-field data
647 * block to be used for returning the command string and its length:
648 * - field 1 A pointer to a buffer of at least the size that is
649 * specified in field 2.
650 * - field 2 The length of the buffer in bytes.
651 *
652 * Return
653 * On exit:
654 * If the call is successful, then the RETURN REGISTER contains 0,
655 * the PARAMETER REGISTER is unchanged, and the data block is
656 * updated as follows:
657 * - field 1 A pointer to a null-terminated string of the command
658 * line.
659 * - field 2 The length of the string in bytes.
660 * If the call is not successful, then the RETURN REGISTER
661 * contains -1.
662 *
663 * Note: The semihosting implementation might impose limits on
664 * the maximum length of the string that can be transferred.
665 * However, the implementation must be able to support a
666 * command-line length of at least 80 bytes.
667 */
668 retval = semihosting_read_fields(target, 2, fields);
669 if (retval != ERROR_OK)
670 return retval;
671 else {
672 uint64_t addr = semihosting_get_field(target, 0, fields);
673 size_t size = semihosting_get_field(target, 1, fields);
674
675 char *arg = semihosting->cmdline ?
676 semihosting->cmdline : "";
677 uint32_t len = strlen(arg) + 1;
678 if (len > size)
679 semihosting->result = -1;
680 else {
681 semihosting_set_field(target, len, 1, fields);
682 retval = target_write_buffer(target, addr, len,
683 (uint8_t *)arg);
684 if (retval != ERROR_OK)
685 return retval;
686 semihosting->result = 0;
687
688 retval = semihosting_write_fields(target, 2, fields);
689 if (retval != ERROR_OK)
690 return retval;
691 }
692 LOG_DEBUG("SYS_GET_CMDLINE=[%s], %" PRId64, arg, semihosting->result);
693 }
694 break;
695
696 case SEMIHOSTING_SYS_HEAPINFO: /* 0x16 */
697 /*
698 * Returns the system stack and heap parameters.
699 *
700 * Entry
701 * On entry, the PARAMETER REGISTER contains the address of a
702 * pointer to a four-field data block. The contents of the data
703 * block are filled by the function. The following C-like
704 * pseudocode describes the layout of the block:
705 * struct block {
706 * void* heap_base;
707 * void* heap_limit;
708 * void* stack_base;
709 * void* stack_limit;
710 * };
711 *
712 * Return
713 * On exit, the PARAMETER REGISTER is unchanged and the data
714 * block has been updated.
715 */
716 retval = semihosting_read_fields(target, 1, fields);
717 if (retval != ERROR_OK)
718 return retval;
719 else {
720 uint64_t addr = semihosting_get_field(target, 0, fields);
721 /* tell the remote we have no idea */
722 memset(fields, 0, 4 * semihosting->word_size_bytes);
723 retval = target_write_memory(target, addr, 4,
724 semihosting->word_size_bytes,
725 fields);
726 if (retval != ERROR_OK)
727 return retval;
728 semihosting->result = 0;
729 }
730 break;
731
732 case SEMIHOSTING_SYS_ISERROR: /* 0x08 */
733 /*
734 * Determines whether the return code from another semihosting
735 * call is an error status or not.
736 *
737 * This call is passed a parameter block containing the error
738 * code to examine.
739 *
740 * Entry
741 * On entry, the PARAMETER REGISTER contains a pointer to a
742 * one-field data block:
743 * - field 1 The required status word to check.
744 *
745 * Return
746 * On exit, the RETURN REGISTER contains:
747 * - 0 if the status field is not an error indication
748 * - A nonzero value if the status field is an error indication.
749 */
750 retval = semihosting_read_fields(target, 1, fields);
751 if (retval != ERROR_OK)
752 return retval;
753
754 uint64_t code = semihosting_get_field(target, 0, fields);
755 semihosting->result = (code != 0);
756 break;
757
758 case SEMIHOSTING_SYS_ISTTY: /* 0x09 */
759 /*
760 * Checks whether a file is connected to an interactive device.
761 *
762 * Entry
763 * On entry, the PARAMETER REGISTER contains a pointer to a
764 * one-field argument block:
765 * field 1 A handle for a previously opened file object.
766 *
767 * Return
768 * On exit, the RETURN REGISTER contains:
769 * - 1 if the handle identifies an interactive device.
770 * - 0 if the handle identifies a file.
771 * - A value other than 1 or 0 if an error occurs.
772 */
773 if (semihosting->is_fileio) {
774 semihosting->hit_fileio = true;
775 fileio_info->identifier = "isatty";
776 fileio_info->param_1 = semihosting->param;
777 } else {
778 retval = semihosting_read_fields(target, 1, fields);
779 if (retval != ERROR_OK)
780 return retval;
781 int fd = semihosting_get_field(target, 0, fields);
782 semihosting->result = isatty(fd);
783 semihosting->sys_errno = errno;
784 LOG_DEBUG("isatty(%d)=%" PRId64, fd, semihosting->result);
785 }
786 break;
787
788 case SEMIHOSTING_SYS_OPEN: /* 0x01 */
789 /*
790 * Opens a file on the host system.
791 *
792 * The file path is specified either as relative to the current
793 * directory of the host process, or absolute, using the path
794 * conventions of the host operating system.
795 *
796 * Semihosting implementations must support opening the special
797 * path name :semihosting-features as part of the semihosting
798 * extensions reporting mechanism.
799 *
800 * ARM targets interpret the special path name :tt as meaning
801 * the console input stream, for an open-read or the console
802 * output stream, for an open-write. Opening these streams is
803 * performed as part of the standard startup code for those
804 * applications that reference the C stdio streams. The
805 * semihosting extension SH_EXT_STDOUT_STDERR allows the
806 * semihosting caller to open separate output streams
807 * corresponding to stdout and stderr. This extension is
808 * reported using feature byte 0, bit 1. Use SYS_OPEN with
809 * the special path name :semihosting-features to access the
810 * feature bits.
811 *
812 * If this extension is supported, the implementation must
813 * support the following additional semantics to SYS_OPEN:
814 * - If the special path name :tt is opened with an fopen
815 * mode requesting write access (w, wb, w+, or w+b), then
816 * this is a request to open stdout.
817 * - If the special path name :tt is opened with a mode
818 * requesting append access (a, ab, a+, or a+b), then this is
819 * a request to open stderr.
820 *
821 * Entry
822 * On entry, the PARAMETER REGISTER contains a pointer to a
823 * three-field argument block:
824 * - field 1 A pointer to a null-terminated string containing
825 * a file or device name.
826 * - field 2 An integer that specifies the file opening mode.
827 * - field 3 An integer that gives the length of the string
828 * pointed to by field 1.
829 *
830 * The length does not include the terminating null character
831 * that must be present.
832 *
833 * Return
834 * On exit, the RETURN REGISTER contains:
835 * - A nonzero handle if the call is successful.
836 * - –1 if the call is not successful.
837 */
838 retval = semihosting_read_fields(target, 3, fields);
839 if (retval != ERROR_OK)
840 return retval;
841 else {
842 uint64_t addr = semihosting_get_field(target, 0, fields);
843 uint32_t mode = semihosting_get_field(target, 1, fields);
844 size_t len = semihosting_get_field(target, 2, fields);
845
846 if (mode > 11) {
847 semihosting->result = -1;
848 semihosting->sys_errno = EINVAL;
849 break;
850 }
851 size_t basedir_len = semihosting->basedir ? strlen(semihosting->basedir) : 0;
852 uint8_t *fn = malloc(basedir_len + len + 2);
853 if (!fn) {
854 semihosting->result = -1;
855 semihosting->sys_errno = ENOMEM;
856 } else {
857 if (basedir_len > 0) {
858 strcpy((char *)fn, semihosting->basedir);
859 if (fn[basedir_len - 1] != '/')
860 fn[basedir_len++] = '/';
861 }
862 retval = target_read_memory(target, addr, 1, len, fn + basedir_len);
863 if (retval != ERROR_OK) {
864 free(fn);
865 return retval;
866 }
867 fn[basedir_len + len] = 0;
868 /* TODO: implement the :semihosting-features special file.
869 * */
870 if (semihosting->is_fileio) {
871 if (strcmp((char *)fn, ":semihosting-features") == 0) {
872 semihosting->result = -1;
873 semihosting->sys_errno = EINVAL;
874 } else if (strcmp((char *)fn, ":tt") == 0) {
875 if (mode == 0)
876 semihosting->result = 0;
877 else if (mode == 4)
878 semihosting->result = 1;
879 else if (mode == 8)
880 semihosting->result = 2;
881 else
882 semihosting->result = -1;
883 } else {
884 semihosting->hit_fileio = true;
885 fileio_info->identifier = "open";
886 fileio_info->param_1 = addr;
887 fileio_info->param_2 = len;
888 fileio_info->param_3 = open_gdb_modeflags[mode];
889 fileio_info->param_4 = 0644;
890 }
891 } else {
892 if (strcmp((char *)fn, ":tt") == 0) {
893 /* Mode is:
894 * - 0-3 ("r") for stdin,
895 * - 4-7 ("w") for stdout,
896 * - 8-11 ("a") for stderr */
897 if (mode < 4) {
898 int fd = dup(STDIN_FILENO);
899 semihosting->result = fd;
900 semihosting->stdin_fd = fd;
901 semihosting->sys_errno = errno;
902 LOG_DEBUG("dup(STDIN)=%" PRId64, semihosting->result);
903 } else if (mode < 8) {
904 int fd = dup(STDOUT_FILENO);
905 semihosting->result = fd;
906 semihosting->stdout_fd = fd;
907 semihosting->sys_errno = errno;
908 LOG_DEBUG("dup(STDOUT)=%" PRId64, semihosting->result);
909 } else {
910 int fd = dup(STDERR_FILENO);
911 semihosting->result = fd;
912 semihosting->stderr_fd = fd;
913 semihosting->sys_errno = errno;
914 LOG_DEBUG("dup(STDERR)=%" PRId64, semihosting->result);
915 }
916 } else {
917 /* cygwin requires the permission setting
918 * otherwise it will fail to reopen a previously
919 * written file */
920 semihosting->result = open((char *)fn,
921 open_host_modeflags[mode],
922 0644);
923 semihosting->sys_errno = errno;
924 LOG_DEBUG("open('%s')=%" PRId64, fn, semihosting->result);
925 }
926 }
927 free(fn);
928 }
929 }
930 break;
931
932 case SEMIHOSTING_SYS_READ: /* 0x06 */
933 /*
934 * Reads the contents of a file into a buffer. The file position
935 * is specified either:
936 * - Explicitly by a SYS_SEEK.
937 * - Implicitly one byte beyond the previous SYS_READ or
938 * SYS_WRITE request.
939 *
940 * The file position is at the start of the file when it is
941 * opened, and is lost when the file is closed. Perform the
942 * file operation as a single action whenever possible. For
943 * example, do not split a read of 16KB into four 4KB chunks
944 * unless there is no alternative.
945 *
946 * Entry
947 * On entry, the PARAMETER REGISTER contains a pointer to a
948 * three-field data block:
949 * - field 1 Contains a handle for a file previously opened
950 * with SYS_OPEN.
951 * - field 2 Points to a buffer.
952 * - field 3 Contains the number of bytes to read to the buffer
953 * from the file.
954 *
955 * Return
956 * On exit, the RETURN REGISTER contains the number of bytes not
957 * filled in the buffer (buffer_length - bytes_read) as follows:
958 * - If the RETURN REGISTER is 0, the entire buffer was
959 * successfully filled.
960 * - If the RETURN REGISTER is the same as field 3, no bytes
961 * were read (EOF can be assumed).
962 * - If the RETURN REGISTER contains a value smaller than
963 * field 3, the read succeeded but the buffer was only partly
964 * filled. For interactive devices, this is the most common
965 * return value.
966 */
967 retval = semihosting_read_fields(target, 3, fields);
968 if (retval != ERROR_OK)
969 return retval;
970 else {
971 int fd = semihosting_get_field(target, 0, fields);
972 uint64_t addr = semihosting_get_field(target, 1, fields);
973 size_t len = semihosting_get_field(target, 2, fields);
974 if (semihosting->is_fileio) {
975 semihosting->hit_fileio = true;
976 fileio_info->identifier = "read";
977 fileio_info->param_1 = fd;
978 fileio_info->param_2 = addr;
979 fileio_info->param_3 = len;
980 } else {
981 uint8_t *buf = malloc(len);
982 if (!buf) {
983 semihosting->result = -1;
984 semihosting->sys_errno = ENOMEM;
985 } else {
986 semihosting->result = semihosting_read(semihosting, fd, buf, len);
987 LOG_DEBUG("read(%d, 0x%" PRIx64 ", %zu)=%" PRId64,
988 fd,
989 addr,
990 len,
991 semihosting->result);
992 if (semihosting->result >= 0) {
993 retval = target_write_buffer(target, addr,
994 semihosting->result,
995 buf);
996 if (retval != ERROR_OK) {
997 free(buf);
998 return retval;
999 }
1000 /* the number of bytes NOT filled in */
1001 semihosting->result = len -
1002 semihosting->result;
1003 }
1004 free(buf);
1005 }
1006 }
1007 }
1008 break;
1009
1010 case SEMIHOSTING_SYS_READC: /* 0x07 */
1011 /*
1012 * Reads a byte from the console.
1013 *
1014 * Entry
1015 * The PARAMETER REGISTER must contain 0. There are no other
1016 * parameters or values possible.
1017 *
1018 * Return
1019 * On exit, the RETURN REGISTER contains the byte read from
1020 * the console.
1021 */
1022 if (semihosting->is_fileio) {
1023 LOG_ERROR("SYS_READC not supported by semihosting fileio");
1024 return ERROR_FAIL;
1025 }
1026 semihosting->result = semihosting_getchar(semihosting, semihosting->stdin_fd);
1027 LOG_DEBUG("getchar()=%" PRId64, semihosting->result);
1028 break;
1029
1030 case SEMIHOSTING_SYS_REMOVE: /* 0x0E */
1031 /*
1032 * Deletes a specified file on the host filing system.
1033 *
1034 * Entry
1035 * On entry, the PARAMETER REGISTER contains a pointer to a
1036 * two-field argument block:
1037 * - field 1 Points to a null-terminated string that gives the
1038 * path name of the file to be deleted.
1039 * - field 2 The length of the string.
1040 *
1041 * Return
1042 * On exit, the RETURN REGISTER contains:
1043 * - 0 if the delete is successful
1044 * - A nonzero, host-specific error code if the delete fails.
1045 */
1046 retval = semihosting_read_fields(target, 2, fields);
1047 if (retval != ERROR_OK)
1048 return retval;
1049 else {
1050 uint64_t addr = semihosting_get_field(target, 0, fields);
1051 size_t len = semihosting_get_field(target, 1, fields);
1052 if (semihosting->is_fileio) {
1053 semihosting->hit_fileio = true;
1054 fileio_info->identifier = "unlink";
1055 fileio_info->param_1 = addr;
1056 fileio_info->param_2 = len;
1057 } else {
1058 uint8_t *fn = malloc(len+1);
1059 if (!fn) {
1060 semihosting->result = -1;
1061 semihosting->sys_errno = ENOMEM;
1062 } else {
1063 retval =
1064 target_read_memory(target, addr, 1, len,
1065 fn);
1066 if (retval != ERROR_OK) {
1067 free(fn);
1068 return retval;
1069 }
1070 fn[len] = 0;
1071 semihosting->result = remove((char *)fn);
1072 semihosting->sys_errno = errno;
1073 LOG_DEBUG("remove('%s')=%" PRId64, fn, semihosting->result);
1074
1075 free(fn);
1076 }
1077 }
1078 }
1079 break;
1080
1081 case SEMIHOSTING_SYS_RENAME: /* 0x0F */
1082 /*
1083 * Renames a specified file.
1084 *
1085 * Entry
1086 * On entry, the PARAMETER REGISTER contains a pointer to a
1087 * four-field data block:
1088 * - field 1 A pointer to the name of the old file.
1089 * - field 2 The length of the old filename.
1090 * - field 3 A pointer to the new filename.
1091 * - field 4 The length of the new filename. Both strings are
1092 * null-terminated.
1093 *
1094 * Return
1095 * On exit, the RETURN REGISTER contains:
1096 * - 0 if the rename is successful.
1097 * - A nonzero, host-specific error code if the rename fails.
1098 */
1099 retval = semihosting_read_fields(target, 4, fields);
1100 if (retval != ERROR_OK)
1101 return retval;
1102 else {
1103 uint64_t addr1 = semihosting_get_field(target, 0, fields);
1104 size_t len1 = semihosting_get_field(target, 1, fields);
1105 uint64_t addr2 = semihosting_get_field(target, 2, fields);
1106 size_t len2 = semihosting_get_field(target, 3, fields);
1107 if (semihosting->is_fileio) {
1108 semihosting->hit_fileio = true;
1109 fileio_info->identifier = "rename";
1110 fileio_info->param_1 = addr1;
1111 fileio_info->param_2 = len1;
1112 fileio_info->param_3 = addr2;
1113 fileio_info->param_4 = len2;
1114 } else {
1115 uint8_t *fn1 = malloc(len1+1);
1116 uint8_t *fn2 = malloc(len2+1);
1117 if (!fn1 || !fn2) {
1118 free(fn1);
1119 free(fn2);
1120 semihosting->result = -1;
1121 semihosting->sys_errno = ENOMEM;
1122 } else {
1123 retval = target_read_memory(target, addr1, 1, len1,
1124 fn1);
1125 if (retval != ERROR_OK) {
1126 free(fn1);
1127 free(fn2);
1128 return retval;
1129 }
1130 retval = target_read_memory(target, addr2, 1, len2,
1131 fn2);
1132 if (retval != ERROR_OK) {
1133 free(fn1);
1134 free(fn2);
1135 return retval;
1136 }
1137 fn1[len1] = 0;
1138 fn2[len2] = 0;
1139 semihosting->result = rename((char *)fn1,
1140 (char *)fn2);
1141 semihosting->sys_errno = errno;
1142 LOG_DEBUG("rename('%s', '%s')=%" PRId64 " %d", fn1, fn2, semihosting->result, errno);
1143 free(fn1);
1144 free(fn2);
1145 }
1146 }
1147 }
1148 break;
1149
1150 case SEMIHOSTING_SYS_SEEK: /* 0x0A */
1151 /*
1152 * Seeks to a specified position in a file using an offset
1153 * specified from the start of the file. The file is assumed
1154 * to be a byte array and the offset is given in bytes.
1155 *
1156 * Entry
1157 * On entry, the PARAMETER REGISTER contains a pointer to a
1158 * two-field data block:
1159 * - field 1 A handle for a seekable file object.
1160 * - field 2 The absolute byte position to seek to.
1161 *
1162 * Return
1163 * On exit, the RETURN REGISTER contains:
1164 * - 0 if the request is successful.
1165 * - A negative value if the request is not successful.
1166 * Use SYS_ERRNO to read the value of the host errno variable
1167 * describing the error.
1168 *
1169 * Note: The effect of seeking outside the current extent of
1170 * the file object is undefined.
1171 */
1172 retval = semihosting_read_fields(target, 2, fields);
1173 if (retval != ERROR_OK)
1174 return retval;
1175 else {
1176 int fd = semihosting_get_field(target, 0, fields);
1177 off_t pos = semihosting_get_field(target, 1, fields);
1178 if (semihosting->is_fileio) {
1179 semihosting->hit_fileio = true;
1180 fileio_info->identifier = "lseek";
1181 fileio_info->param_1 = fd;
1182 fileio_info->param_2 = pos;
1183 fileio_info->param_3 = SEEK_SET;
1184 } else {
1185 semihosting->result = lseek(fd, pos, SEEK_SET);
1186 semihosting->sys_errno = errno;
1187 LOG_DEBUG("lseek(%d, %d)=%" PRId64, fd, (int)pos, semihosting->result);
1188 if (semihosting->result == pos)
1189 semihosting->result = 0;
1190 }
1191 }
1192 break;
1193
1194 case SEMIHOSTING_SYS_SYSTEM: /* 0x12 */
1195 /*
1196 * Passes a command to the host command-line interpreter.
1197 * This enables you to execute a system command such as dir,
1198 * ls, or pwd. The terminal I/O is on the host, and is not
1199 * visible to the target.
1200 *
1201 * Entry
1202 * On entry, the PARAMETER REGISTER contains a pointer to a
1203 * two-field argument block:
1204 * - field 1 Points to a string to be passed to the host
1205 * command-line interpreter.
1206 * - field 2 The length of the string.
1207 *
1208 * Return
1209 * On exit, the RETURN REGISTER contains the return status.
1210 */
1211
1212 /* Provide SYS_SYSTEM functionality. Uses the
1213 * libc system command, there may be a reason *NOT*
1214 * to use this, but as I can't think of one, I
1215 * implemented it this way.
1216 */
1217 retval = semihosting_read_fields(target, 2, fields);
1218 if (retval != ERROR_OK)
1219 return retval;
1220 else {
1221 uint64_t addr = semihosting_get_field(target, 0, fields);
1222 size_t len = semihosting_get_field(target, 1, fields);
1223 if (semihosting->is_fileio) {
1224 semihosting->hit_fileio = true;
1225 fileio_info->identifier = "system";
1226 fileio_info->param_1 = addr;
1227 fileio_info->param_2 = len;
1228 } else {
1229 uint8_t *cmd = malloc(len+1);
1230 if (!cmd) {
1231 semihosting->result = -1;
1232 semihosting->sys_errno = ENOMEM;
1233 } else {
1234 retval = target_read_memory(target,
1235 addr,
1236 1,
1237 len,
1238 cmd);
1239 if (retval != ERROR_OK) {
1240 free(cmd);
1241 return retval;
1242 } else {
1243 cmd[len] = 0;
1244 semihosting->result = system(
1245 (const char *)cmd);
1246 LOG_DEBUG("system('%s')=%" PRId64, cmd, semihosting->result);
1247 }
1248
1249 free(cmd);
1250 }
1251 }
1252 }
1253 break;
1254
1255 case SEMIHOSTING_SYS_TIME: /* 0x11 */
1256 /*
1257 * Returns the number of seconds since 00:00 January 1, 1970.
1258 * This value is real-world time, regardless of any debug agent
1259 * configuration.
1260 *
1261 * Entry
1262 * There are no parameters.
1263 *
1264 * Return
1265 * On exit, the RETURN REGISTER contains the number of seconds.
1266 */
1267 semihosting->result = time(NULL);
1268 break;
1269
1270 case SEMIHOSTING_SYS_WRITE: /* 0x05 */
1271 /*
1272 * Writes the contents of a buffer to a specified file at the
1273 * current file position. The file position is specified either:
1274 * - Explicitly, by a SYS_SEEK.
1275 * - Implicitly as one byte beyond the previous SYS_READ or
1276 * SYS_WRITE request.
1277 *
1278 * The file position is at the start of the file when the file
1279 * is opened, and is lost when the file is closed.
1280 *
1281 * Perform the file operation as a single action whenever
1282 * possible. For example, do not split a write of 16KB into
1283 * four 4KB chunks unless there is no alternative.
1284 *
1285 * Entry
1286 * On entry, the PARAMETER REGISTER contains a pointer to a
1287 * three-field data block:
1288 * - field 1 Contains a handle for a file previously opened
1289 * with SYS_OPEN.
1290 * - field 2 Points to the memory containing the data to be written.
1291 * - field 3 Contains the number of bytes to be written from
1292 * the buffer to the file.
1293 *
1294 * Return
1295 * On exit, the RETURN REGISTER contains:
1296 * - 0 if the call is successful.
1297 * - The number of bytes that are not written, if there is an error.
1298 */
1299 retval = semihosting_read_fields(target, 3, fields);
1300 if (retval != ERROR_OK)
1301 return retval;
1302 else {
1303 int fd = semihosting_get_field(target, 0, fields);
1304 uint64_t addr = semihosting_get_field(target, 1, fields);
1305 size_t len = semihosting_get_field(target, 2, fields);
1306 if (semihosting->is_fileio) {
1307 semihosting->hit_fileio = true;
1308 fileio_info->identifier = "write";
1309 fileio_info->param_1 = fd;
1310 fileio_info->param_2 = addr;
1311 fileio_info->param_3 = len;
1312 } else {
1313 uint8_t *buf = malloc(len);
1314 if (!buf) {
1315 semihosting->result = -1;
1316 semihosting->sys_errno = ENOMEM;
1317 } else {
1318 retval = target_read_buffer(target, addr, len, buf);
1319 if (retval != ERROR_OK) {
1320 free(buf);
1321 return retval;
1322 }
1323 semihosting->result = semihosting_write(semihosting, fd, buf, len);
1324 semihosting->sys_errno = errno;
1325 LOG_DEBUG("write(%d, 0x%" PRIx64 ", %zu)=%" PRId64,
1326 fd,
1327 addr,
1328 len,
1329 semihosting->result);
1330 if (semihosting->result >= 0) {
1331 /* The number of bytes that are NOT written.
1332 * */
1333 semihosting->result = len -
1334 semihosting->result;
1335 }
1336
1337 free(buf);
1338 }
1339 }
1340 }
1341 break;
1342
1343 case SEMIHOSTING_SYS_WRITEC: /* 0x03 */
1344 /*
1345 * Writes a character byte, pointed to by the PARAMETER REGISTER,
1346 * to the debug channel. When executed under a semihosting
1347 * debugger, the character appears on the host debugger console.
1348 *
1349 * Entry
1350 * On entry, the PARAMETER REGISTER contains a pointer to the
1351 * character.
1352 *
1353 * Return
1354 * None. The RETURN REGISTER is corrupted.
1355 */
1356 if (semihosting->is_fileio) {
1357 semihosting->hit_fileio = true;
1358 fileio_info->identifier = "write";
1359 fileio_info->param_1 = 1;
1360 fileio_info->param_2 = semihosting->param;
1361 fileio_info->param_3 = 1;
1362 } else {
1363 uint64_t addr = semihosting->param;
1364 unsigned char c;
1365 retval = target_read_memory(target, addr, 1, 1, &c);
1366 if (retval != ERROR_OK)
1367 return retval;
1368 semihosting_putchar(semihosting, semihosting->stdout_fd, c);
1369 semihosting->result = 0;
1370 }
1371 break;
1372
1373 case SEMIHOSTING_SYS_WRITE0: /* 0x04 */
1374 /*
1375 * Writes a null-terminated string to the debug channel.
1376 * When executed under a semihosting debugger, the characters
1377 * appear on the host debugger console.
1378 *
1379 * Entry
1380 * On entry, the PARAMETER REGISTER contains a pointer to the
1381 * first byte of the string.
1382 *
1383 * Return
1384 * None. The RETURN REGISTER is corrupted.
1385 */
1386 if (semihosting->is_fileio) {
1387 size_t count = 0;
1388 uint64_t addr = semihosting->param;
1389 for (;; addr++) {
1390 unsigned char c;
1391 retval = target_read_memory(target, addr, 1, 1, &c);
1392 if (retval != ERROR_OK)
1393 return retval;
1394 if (c == '\0')
1395 break;
1396 count++;
1397 }
1398 semihosting->hit_fileio = true;
1399 fileio_info->identifier = "write";
1400 fileio_info->param_1 = 1;
1401 fileio_info->param_2 = semihosting->param;
1402 fileio_info->param_3 = count;
1403 } else {
1404 uint64_t addr = semihosting->param;
1405 do {
1406 unsigned char c;
1407 retval = target_read_memory(target, addr++, 1, 1, &c);
1408 if (retval != ERROR_OK)
1409 return retval;
1410 if (!c)
1411 break;
1412 semihosting_putchar(semihosting, semihosting->stdout_fd, c);
1413 } while (1);
1414 semihosting->result = 0;
1415 }
1416 break;
1417
1418 case SEMIHOSTING_USER_CMD_0X100 ... SEMIHOSTING_USER_CMD_0X107:
1419 /**
1420 * This is a user defined operation (while user cmds 0x100-0x1ff
1421 * are possible, only 0x100-0x107 are currently implemented).
1422 *
1423 * Reads the user operation parameters from target, then fires the
1424 * corresponding target event. When the target callbacks returned,
1425 * cleans up the command parameter buffer.
1426 *
1427 * Entry
1428 * On entry, the PARAMETER REGISTER contains a pointer to a
1429 * two-field data block:
1430 * - field 1 Contains a pointer to the bound command parameter
1431 * string
1432 * - field 2 Contains the command parameter string length
1433 *
1434 * Return
1435 * On exit, the RETURN REGISTER contains the return status.
1436 */
1437 if (semihosting->user_command_extension) {
1438 retval = semihosting->user_command_extension(target);
1439 if (retval != ERROR_NOT_IMPLEMENTED)
1440 break;
1441 /* If custom user command not handled, we are looking for the TCL handler */
1442 }
1443
1444 assert(!semihosting_user_op_params);
1445 retval = semihosting_read_fields(target, 2, fields);
1446 if (retval != ERROR_OK) {
1447 LOG_ERROR("Failed to read fields for user defined command"
1448 " op=0x%x", semihosting->op);
1449 return retval;
1450 }
1451
1452 uint64_t addr = semihosting_get_field(target, 0, fields);
1453
1454 size_t len = semihosting_get_field(target, 1, fields);
1455 if (len > SEMIHOSTING_MAX_TCL_COMMAND_FIELD_LENGTH) {
1456 LOG_ERROR("The maximum length for user defined command "
1457 "parameter is %u, received length is %zu (op=0x%x)",
1458 SEMIHOSTING_MAX_TCL_COMMAND_FIELD_LENGTH,
1459 len,
1460 semihosting->op);
1461 return ERROR_FAIL;
1462 }
1463
1464 semihosting_user_op_params = malloc(len + 1);
1465 if (!semihosting_user_op_params)
1466 return ERROR_FAIL;
1467 semihosting_user_op_params[len] = 0;
1468
1469 retval = target_read_buffer(target, addr, len,
1470 (uint8_t *)(semihosting_user_op_params));
1471 if (retval != ERROR_OK) {
1472 LOG_ERROR("Failed to read from target, semihosting op=0x%x",
1473 semihosting->op);
1474 free(semihosting_user_op_params);
1475 semihosting_user_op_params = NULL;
1476 return retval;
1477 }
1478
1479 target_handle_event(target, semihosting->op);
1480 free(semihosting_user_op_params);
1481 semihosting_user_op_params = NULL;
1482 semihosting->result = 0;
1483 break;
1484
1485 case SEMIHOSTING_SYS_ELAPSED: /* 0x30 */
1486 /*
1487 * Returns the number of elapsed target ticks since execution
1488 * started.
1489 * Use SYS_TICKFREQ to determine the tick frequency.
1490 *
1491 * Entry (32-bit)
1492 * On entry, the PARAMETER REGISTER points to a two-field data
1493 * block to be used for returning the number of elapsed ticks:
1494 * - field 1 The least significant field and is at the low address.
1495 * - field 2 The most significant field and is at the high address.
1496 *
1497 * Entry (64-bit)
1498 * On entry the PARAMETER REGISTER points to a one-field data
1499 * block to be used for returning the number of elapsed ticks:
1500 * - field 1 The number of elapsed ticks as a 64-bit value.
1501 *
1502 * Return
1503 * On exit:
1504 * - On success, the RETURN REGISTER contains 0, the PARAMETER
1505 * REGISTER is unchanged, and the data block pointed to by the
1506 * PARAMETER REGISTER is filled in with the number of elapsed
1507 * ticks.
1508 * - On failure, the RETURN REGISTER contains -1, and the
1509 * PARAMETER REGISTER contains -1.
1510 *
1511 * Note: Some semihosting implementations might not support this
1512 * semihosting operation, and they always return -1 in the
1513 * RETURN REGISTER.
1514 */
1515
1516 case SEMIHOSTING_SYS_TICKFREQ: /* 0x31 */
1517 /*
1518 * Returns the tick frequency.
1519 *
1520 * Entry
1521 * The PARAMETER REGISTER must contain 0 on entry to this routine.
1522 *
1523 * Return
1524 * On exit, the RETURN REGISTER contains either:
1525 * - The number of ticks per second.
1526 * - –1 if the target does not know the value of one tick.
1527 *
1528 * Note: Some semihosting implementations might not support
1529 * this semihosting operation, and they always return -1 in the
1530 * RETURN REGISTER.
1531 */
1532
1533 case SEMIHOSTING_SYS_TMPNAM: /* 0x0D */
1534 /*
1535 * Returns a temporary name for a file identified by a system
1536 * file identifier.
1537 *
1538 * Entry
1539 * On entry, the PARAMETER REGISTER contains a pointer to a
1540 * three-word argument block:
1541 * - field 1 A pointer to a buffer.
1542 * - field 2 A target identifier for this filename. Its value
1543 * must be an integer in the range 0-255.
1544 * - field 3 Contains the length of the buffer. The length must
1545 * be at least the value of L_tmpnam on the host system.
1546 *
1547 * Return
1548 * On exit, the RETURN REGISTER contains:
1549 * - 0 if the call is successful.
1550 * - –1 if an error occurs.
1551 *
1552 * The buffer pointed to by the PARAMETER REGISTER contains
1553 * the filename, prefixed with a suitable directory name.
1554 * If you use the same target identifier again, the same
1555 * filename is returned.
1556 *
1557 * Note: The returned string must be null-terminated.
1558 */
1559
1560 default:
1561 fprintf(stderr, "semihosting: unsupported call %#x\n",
1562 (unsigned) semihosting->op);
1563 semihosting->result = -1;
1564 semihosting->sys_errno = ENOTSUP;
1565 }
1566
1567 if (!semihosting->hit_fileio) {
1568 retval = semihosting->post_result(target);
1569 if (retval != ERROR_OK) {
1570 LOG_ERROR("Failed to post semihosting result");
1571 return retval;
1572 }
1573 }
1574
1575 return ERROR_OK;
1576 }
1577
1578 /* -------------------------------------------------------------------------
1579 * Local functions. */
1580
1581 static int semihosting_common_fileio_info(struct target *target,
1582 struct gdb_fileio_info *fileio_info)
1583 {
1584 struct semihosting *semihosting = target->semihosting;
1585 if (!semihosting)
1586 return ERROR_FAIL;
1587
1588 /*
1589 * To avoid unnecessary duplication, semihosting prepares the
1590 * fileio_info structure out-of-band when the target halts. See
1591 * do_semihosting for more detail.
1592 */
1593 if (!semihosting->is_fileio || !semihosting->hit_fileio)
1594 return ERROR_FAIL;
1595
1596 return ERROR_OK;
1597 }
1598
1599 static int semihosting_common_fileio_end(struct target *target, int result,
1600 int fileio_errno, bool ctrl_c)
1601 {
1602 struct gdb_fileio_info *fileio_info = target->fileio_info;
1603 struct semihosting *semihosting = target->semihosting;
1604 if (!semihosting)
1605 return ERROR_FAIL;
1606
1607 /* clear pending status */
1608 semihosting->hit_fileio = false;
1609
1610 semihosting->result = result;
1611 semihosting->sys_errno = fileio_errno;
1612
1613 /*
1614 * Some fileio results do not match up with what the semihosting
1615 * operation expects; for these operations, we munge the results
1616 * below:
1617 */
1618 switch (semihosting->op) {
1619 case SEMIHOSTING_SYS_WRITE: /* 0x05 */
1620 case SEMIHOSTING_SYS_READ: /* 0x06 */
1621 if (result < 0)
1622 semihosting->result = fileio_info->param_3; /* Zero bytes read/written. */
1623 else
1624 semihosting->result = (int64_t)fileio_info->param_3 - result;
1625 break;
1626
1627 case SEMIHOSTING_SYS_SEEK: /* 0x0a */
1628 if (result > 0)
1629 semihosting->result = 0;
1630 break;
1631 }
1632
1633 return semihosting->post_result(target);
1634 }
1635
1636 /* -------------------------------------------------------------------------
1637 * Utility functions. */
1638
1639 /**
1640 * Read all fields of a command from target to buffer.
1641 */
1642 int semihosting_read_fields(struct target *target, size_t number,
1643 uint8_t *fields)
1644 {
1645 struct semihosting *semihosting = target->semihosting;
1646 /* Use 4-byte multiples to trigger fast memory access. */
1647 return target_read_memory(target, semihosting->param, 4,
1648 number * (semihosting->word_size_bytes / 4), fields);
1649 }
1650
1651 /**
1652 * Write all fields of a command from buffer to target.
1653 */
1654 int semihosting_write_fields(struct target *target, size_t number,
1655 uint8_t *fields)
1656 {
1657 struct semihosting *semihosting = target->semihosting;
1658 /* Use 4-byte multiples to trigger fast memory access. */
1659 return target_write_memory(target, semihosting->param, 4,
1660 number * (semihosting->word_size_bytes / 4), fields);
1661 }
1662
1663 /**
1664 * Extract a field from the buffer, considering register size and endianness.
1665 */
1666 uint64_t semihosting_get_field(struct target *target, size_t index,
1667 uint8_t *fields)
1668 {
1669 struct semihosting *semihosting = target->semihosting;
1670 if (semihosting->word_size_bytes == 8)
1671 return target_buffer_get_u64(target, fields + (index * 8));
1672 else
1673 return target_buffer_get_u32(target, fields + (index * 4));
1674 }
1675
1676 /**
1677 * Store a field in the buffer, considering register size and endianness.
1678 */
1679 void semihosting_set_field(struct target *target, uint64_t value,
1680 size_t index,
1681 uint8_t *fields)
1682 {
1683 struct semihosting *semihosting = target->semihosting;
1684 if (semihosting->word_size_bytes == 8)
1685 target_buffer_set_u64(target, fields + (index * 8), value);
1686 else
1687 target_buffer_set_u32(target, fields + (index * 4), value);
1688 }
1689
1690 /* -------------------------------------------------------------------------
1691 * Semihosting redirect over TCP structs and functions */
1692
1693 static int semihosting_service_new_connection_handler(struct connection *connection)
1694 {
1695 struct semihosting_tcp_service *service = connection->service->priv;
1696 service->semihosting->tcp_connection = connection;
1697
1698 return ERROR_OK;
1699 }
1700
1701 static int semihosting_service_input_handler(struct connection *connection)
1702 {
1703 struct semihosting_tcp_service *service = connection->service->priv;
1704
1705 if (!connection->input_pending) {
1706 /* consume received data, not for semihosting IO */
1707 const int buf_len = 100;
1708 char buf[buf_len];
1709 int bytes_read = connection_read(connection, buf, buf_len);
1710
1711 if (bytes_read == 0) {
1712 return ERROR_SERVER_REMOTE_CLOSED;
1713 } else if (bytes_read == -1) {
1714 LOG_ERROR("error during read: %s", strerror(errno));
1715 return ERROR_SERVER_REMOTE_CLOSED;
1716 }
1717 } else if (service->error != ERROR_OK) {
1718 return ERROR_SERVER_REMOTE_CLOSED;
1719 }
1720
1721 return ERROR_OK;
1722 }
1723
1724 static int semihosting_service_connection_closed_handler(struct connection *connection)
1725 {
1726 struct semihosting_tcp_service *service = connection->service->priv;
1727 if (service) {
1728 free(service->name);
1729 free(service);
1730 }
1731
1732 return ERROR_OK;
1733 }
1734
1735 static void semihosting_tcp_close_cnx(struct semihosting *semihosting)
1736 {
1737 if (!semihosting->tcp_connection)
1738 return;
1739
1740 struct service *service = semihosting->tcp_connection->service;
1741 remove_service(service->name, service->port);
1742 semihosting->tcp_connection = NULL;
1743
1744 }
1745
1746 static const struct service_driver semihosting_service_driver = {
1747 .name = "semihosting",
1748 .new_connection_during_keep_alive_handler = NULL,
1749 .new_connection_handler = semihosting_service_new_connection_handler,
1750 .input_handler = semihosting_service_input_handler,
1751 .connection_closed_handler = semihosting_service_connection_closed_handler,
1752 .keep_client_alive_handler = NULL,
1753 };
1754
1755 /* -------------------------------------------------------------------------
1756 * Common semihosting commands handlers. */
1757
1758 COMMAND_HANDLER(handle_common_semihosting_command)
1759 {
1760 struct target *target = get_current_target(CMD_CTX);
1761
1762 if (!target) {
1763 LOG_ERROR("No target selected");
1764 return ERROR_FAIL;
1765 }
1766
1767 struct semihosting *semihosting = target->semihosting;
1768 if (!semihosting) {
1769 command_print(CMD, "semihosting not supported for current target");
1770 return ERROR_FAIL;
1771 }
1772
1773 if (CMD_ARGC > 0) {
1774 int is_active;
1775
1776 COMMAND_PARSE_ENABLE(CMD_ARGV[0], is_active);
1777
1778 if (!target_was_examined(target)) {
1779 LOG_ERROR("Target not examined yet");
1780 return ERROR_FAIL;
1781 }
1782
1783 if (semihosting && semihosting->setup(target, is_active) != ERROR_OK) {
1784 LOG_ERROR("Failed to Configure semihosting");
1785 return ERROR_FAIL;
1786 }
1787
1788 /* FIXME never let that "catch" be dropped! (???) */
1789 semihosting->is_active = is_active;
1790 }
1791
1792 command_print(CMD, "semihosting is %s",
1793 semihosting->is_active
1794 ? "enabled" : "disabled");
1795
1796 return ERROR_OK;
1797 }
1798
1799 COMMAND_HANDLER(handle_common_semihosting_redirect_command)
1800 {
1801 struct target *target = get_current_target(CMD_CTX);
1802
1803 if (!target) {
1804 LOG_ERROR("No target selected");
1805 return ERROR_FAIL;
1806 }
1807
1808 struct semihosting *semihosting = target->semihosting;
1809 if (!semihosting) {
1810 command_print(CMD, "semihosting not supported for current target");
1811 return ERROR_FAIL;
1812 }
1813
1814 if (!semihosting->is_active) {
1815 command_print(CMD, "semihosting not yet enabled for current target");
1816 return ERROR_FAIL;
1817 }
1818
1819 enum semihosting_redirect_config cfg;
1820 const char *port;
1821
1822 if (CMD_ARGC < 1)
1823 return ERROR_COMMAND_SYNTAX_ERROR;
1824
1825 if (strcmp(CMD_ARGV[0], "disable") == 0) {
1826 cfg = SEMIHOSTING_REDIRECT_CFG_NONE;
1827 if (CMD_ARGC > 1)
1828 return ERROR_COMMAND_SYNTAX_ERROR;
1829 } else if (strcmp(CMD_ARGV[0], "tcp") == 0) {
1830 if (CMD_ARGC < 2 || CMD_ARGC > 3)
1831 return ERROR_COMMAND_SYNTAX_ERROR;
1832
1833 port = CMD_ARGV[1];
1834
1835 cfg = SEMIHOSTING_REDIRECT_CFG_ALL;
1836 if (CMD_ARGC == 3) {
1837 if (strcmp(CMD_ARGV[2], "debug") == 0)
1838 cfg = SEMIHOSTING_REDIRECT_CFG_DEBUG;
1839 else if (strcmp(CMD_ARGV[2], "stdio") == 0)
1840 cfg = SEMIHOSTING_REDIRECT_CFG_STDIO;
1841 else if (strcmp(CMD_ARGV[2], "all") != 0)
1842 return ERROR_COMMAND_SYNTAX_ERROR;
1843 }
1844 } else {
1845 return ERROR_COMMAND_SYNTAX_ERROR;
1846 }
1847
1848 semihosting_tcp_close_cnx(semihosting);
1849 semihosting->redirect_cfg = SEMIHOSTING_REDIRECT_CFG_NONE;
1850
1851 if (cfg != SEMIHOSTING_REDIRECT_CFG_NONE) {
1852 struct semihosting_tcp_service *service =
1853 calloc(1, sizeof(struct semihosting_tcp_service));
1854 if (!service) {
1855 LOG_ERROR("Failed to allocate semihosting TCP service.");
1856 return ERROR_FAIL;
1857 }
1858
1859 service->semihosting = semihosting;
1860
1861 service->name = alloc_printf("%s semihosting service", target_name(target));
1862 if (!service->name) {
1863 LOG_ERROR("Out of memory");
1864 free(service);
1865 return ERROR_FAIL;
1866 }
1867
1868 int ret = add_service(&semihosting_service_driver,
1869 port, 1, service);
1870
1871 if (ret != ERROR_OK) {
1872 LOG_ERROR("failed to initialize %s", service->name);
1873 free(service->name);
1874 free(service);
1875 return ERROR_FAIL;
1876 }
1877 }
1878
1879 semihosting->redirect_cfg = cfg;
1880
1881 return ERROR_OK;
1882 }
1883
1884 COMMAND_HANDLER(handle_common_semihosting_fileio_command)
1885 {
1886 struct target *target = get_current_target(CMD_CTX);
1887
1888 if (!target) {
1889 LOG_ERROR("No target selected");
1890 return ERROR_FAIL;
1891 }
1892
1893 struct semihosting *semihosting = target->semihosting;
1894 if (!semihosting) {
1895 command_print(CMD, "semihosting not supported for current target");
1896 return ERROR_FAIL;
1897 }
1898
1899 if (!semihosting->is_active) {
1900 command_print(CMD, "semihosting not yet enabled for current target");
1901 return ERROR_FAIL;
1902 }
1903
1904 if (CMD_ARGC > 0)
1905 COMMAND_PARSE_ENABLE(CMD_ARGV[0], semihosting->is_fileio);
1906
1907 command_print(CMD, "semihosting fileio is %s",
1908 semihosting->is_fileio
1909 ? "enabled" : "disabled");
1910
1911 return ERROR_OK;
1912 }
1913
1914 COMMAND_HANDLER(handle_common_semihosting_cmdline)
1915 {
1916 struct target *target = get_current_target(CMD_CTX);
1917 unsigned int i;
1918
1919 if (!target) {
1920 LOG_ERROR("No target selected");
1921 return ERROR_FAIL;
1922 }
1923
1924 struct semihosting *semihosting = target->semihosting;
1925 if (!semihosting) {
1926 command_print(CMD, "semihosting not supported for current target");
1927 return ERROR_FAIL;
1928 }
1929
1930 free(semihosting->cmdline);
1931 semihosting->cmdline = CMD_ARGC > 0 ? strdup(CMD_ARGV[0]) : NULL;
1932
1933 for (i = 1; i < CMD_ARGC; i++) {
1934 char *cmdline = alloc_printf("%s %s", semihosting->cmdline, CMD_ARGV[i]);
1935 if (!cmdline)
1936 break;
1937 free(semihosting->cmdline);
1938 semihosting->cmdline = cmdline;
1939 }
1940
1941 command_print(CMD, "semihosting command line is [%s]",
1942 semihosting->cmdline);
1943
1944 return ERROR_OK;
1945 }
1946
1947 COMMAND_HANDLER(handle_common_semihosting_resumable_exit_command)
1948 {
1949 struct target *target = get_current_target(CMD_CTX);
1950
1951 if (!target) {
1952 LOG_ERROR("No target selected");
1953 return ERROR_FAIL;
1954 }
1955
1956 struct semihosting *semihosting = target->semihosting;
1957 if (!semihosting) {
1958 command_print(CMD, "semihosting not supported for current target");
1959 return ERROR_FAIL;
1960 }
1961
1962 if (!semihosting->is_active) {
1963 command_print(CMD, "semihosting not yet enabled for current target");
1964 return ERROR_FAIL;
1965 }
1966
1967 if (CMD_ARGC > 0)
1968 COMMAND_PARSE_ENABLE(CMD_ARGV[0], semihosting->has_resumable_exit);
1969
1970 command_print(CMD, "semihosting resumable exit is %s",
1971 semihosting->has_resumable_exit
1972 ? "enabled" : "disabled");
1973
1974 return ERROR_OK;
1975 }
1976
1977 COMMAND_HANDLER(handle_common_semihosting_read_user_param_command)
1978 {
1979 struct target *target = get_current_target(CMD_CTX);
1980 struct semihosting *semihosting = target->semihosting;
1981
1982 if (CMD_ARGC)
1983 return ERROR_COMMAND_SYNTAX_ERROR;
1984
1985 if (!semihosting->is_active) {
1986 LOG_ERROR("semihosting not yet enabled for current target");
1987 return ERROR_FAIL;
1988 }
1989
1990 if (!semihosting_user_op_params) {
1991 LOG_ERROR("This command is usable only from a registered user "
1992 "semihosting event callback.");
1993 return ERROR_FAIL;
1994 }
1995
1996 command_print_sameline(CMD, "%s", semihosting_user_op_params);
1997
1998 return ERROR_OK;
1999 }
2000
2001 COMMAND_HANDLER(handle_common_semihosting_basedir_command)
2002 {
2003 struct target *target = get_current_target(CMD_CTX);
2004
2005 if (CMD_ARGC > 1)
2006 return ERROR_COMMAND_SYNTAX_ERROR;
2007
2008 if (!target) {
2009 LOG_ERROR("No target selected");
2010 return ERROR_FAIL;
2011 }
2012
2013 struct semihosting *semihosting = target->semihosting;
2014 if (!semihosting) {
2015 command_print(CMD, "semihosting not supported for current target");
2016 return ERROR_FAIL;
2017 }
2018
2019 if (!semihosting->is_active) {
2020 command_print(CMD, "semihosting not yet enabled for current target");
2021 return ERROR_FAIL;
2022 }
2023
2024 if (CMD_ARGC > 0) {
2025 free(semihosting->basedir);
2026 semihosting->basedir = strdup(CMD_ARGV[0]);
2027 if (!semihosting->basedir) {
2028 command_print(CMD, "semihosting failed to allocate memory for basedir!");
2029 return ERROR_FAIL;
2030 }
2031 }
2032
2033 command_print(CMD, "semihosting base dir: %s",
2034 semihosting->basedir ? semihosting->basedir : "");
2035
2036 return ERROR_OK;
2037 }
2038
2039 const struct command_registration semihosting_common_handlers[] = {
2040 {
2041 .name = "semihosting",
2042 .handler = handle_common_semihosting_command,
2043 .mode = COMMAND_EXEC,
2044 .usage = "['enable'|'disable']",
2045 .help = "activate support for semihosting operations",
2046 },
2047 {
2048 .name = "semihosting_redirect",
2049 .handler = handle_common_semihosting_redirect_command,
2050 .mode = COMMAND_EXEC,
2051 .usage = "(disable | tcp <port> ['debug'|'stdio'|'all'])",
2052 .help = "redirect semihosting IO",
2053 },
2054 {
2055 .name = "semihosting_cmdline",
2056 .handler = handle_common_semihosting_cmdline,
2057 .mode = COMMAND_EXEC,
2058 .usage = "arguments",
2059 .help = "command line arguments to be passed to program",
2060 },
2061 {
2062 .name = "semihosting_fileio",
2063 .handler = handle_common_semihosting_fileio_command,
2064 .mode = COMMAND_EXEC,
2065 .usage = "['enable'|'disable']",
2066 .help = "activate support for semihosting fileio operations",
2067 },
2068 {
2069 .name = "semihosting_resexit",
2070 .handler = handle_common_semihosting_resumable_exit_command,
2071 .mode = COMMAND_EXEC,
2072 .usage = "['enable'|'disable']",
2073 .help = "activate support for semihosting resumable exit",
2074 },
2075 {
2076 .name = "semihosting_read_user_param",
2077 .handler = handle_common_semihosting_read_user_param_command,
2078 .mode = COMMAND_EXEC,
2079 .usage = "",
2080 .help = "read parameters in semihosting-user-cmd-0x10X callbacks",
2081 },
2082 {
2083 .name = "semihosting_basedir",
2084 .handler = handle_common_semihosting_basedir_command,
2085 .mode = COMMAND_EXEC,
2086 .usage = "[dir]",
2087 .help = "set the base directory for semihosting I/O operations",
2088 },
2089 COMMAND_REGISTRATION_DONE
2090 };
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