1 /* Memory attributes support, for GDB.
3 Copyright (C) 2001-2017 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
25 #include "target-dcache.h"
29 #include "breakpoint.h"
30 #include "cli/cli-utils.h"
32 const struct mem_attrib default_mem_attrib =
35 MEM_WIDTH_UNSPECIFIED,
39 -1 /* Flash blocksize not specified. */
42 const struct mem_attrib unknown_mem_attrib =
45 MEM_WIDTH_UNSPECIFIED,
49 -1 /* Flash blocksize not specified. */
53 VEC(mem_region_s) *mem_region_list, *target_mem_region_list;
54 static int mem_number = 0;
56 /* If this flag is set, the memory region list should be automatically
57 updated from the target. If it is clear, the list is user-controlled
58 and should be left alone. */
59 static int mem_use_target = 1;
61 /* If this flag is set, we have tried to fetch the target memory regions
62 since the last time it was invalidated. If that list is still
63 empty, then the target can't supply memory regions. */
64 static int target_mem_regions_valid;
66 /* If this flag is set, gdb will assume that memory ranges not
67 specified by the memory map have type MEM_NONE, and will
68 emit errors on all accesses to that memory. */
69 static int inaccessible_by_default = 1;
72 show_inaccessible_by_default (struct ui_file *file, int from_tty,
73 struct cmd_list_element *c,
76 if (inaccessible_by_default)
77 fprintf_filtered (file, _("Unknown memory addresses will "
78 "be treated as inaccessible.\n"));
80 fprintf_filtered (file, _("Unknown memory addresses "
81 "will be treated as RAM.\n"));
85 /* Predicate function which returns true if LHS should sort before RHS
86 in a list of memory regions, useful for VEC_lower_bound. */
89 mem_region_lessthan (const struct mem_region *lhs,
90 const struct mem_region *rhs)
92 return lhs->lo < rhs->lo;
95 /* A helper function suitable for qsort, used to sort a
96 VEC(mem_region_s) by starting address. */
99 mem_region_cmp (const void *untyped_lhs, const void *untyped_rhs)
101 const struct mem_region *lhs = (const struct mem_region *) untyped_lhs;
102 const struct mem_region *rhs = (const struct mem_region *) untyped_rhs;
104 if (lhs->lo < rhs->lo)
106 else if (lhs->lo == rhs->lo)
112 /* Allocate a new memory region, with default settings. */
115 mem_region_init (struct mem_region *newobj)
117 memset (newobj, 0, sizeof (struct mem_region));
118 newobj->enabled_p = 1;
119 newobj->attrib = default_mem_attrib;
122 /* This function should be called before any command which would
123 modify the memory region list. It will handle switching from
124 a target-provided list to a local list, if necessary. */
127 require_user_regions (int from_tty)
129 struct mem_region *m;
132 /* If we're already using a user-provided list, nothing to do. */
136 /* Switch to a user-provided list (possibly a copy of the current
140 /* If we don't have a target-provided region list yet, then
142 if (mem_region_list == NULL)
145 /* Otherwise, let the user know how to get back. */
147 warning (_("Switching to manual control of memory regions; use "
148 "\"mem auto\" to fetch regions from the target again."));
150 /* And create a new list for the user to modify. */
151 length = VEC_length (mem_region_s, target_mem_region_list);
152 mem_region_list = VEC_alloc (mem_region_s, length);
153 for (ix = 0; VEC_iterate (mem_region_s, target_mem_region_list, ix, m); ix++)
154 VEC_quick_push (mem_region_s, mem_region_list, m);
157 /* This function should be called before any command which would
158 read the memory region list, other than those which call
159 require_user_regions. It will handle fetching the
160 target-provided list, if necessary. */
163 require_target_regions (void)
165 if (mem_use_target && !target_mem_regions_valid)
167 target_mem_regions_valid = 1;
168 target_mem_region_list = target_memory_map ();
169 mem_region_list = target_mem_region_list;
174 create_mem_region (CORE_ADDR lo, CORE_ADDR hi,
175 const struct mem_attrib *attrib)
177 struct mem_region newobj;
180 /* lo == hi is a useless empty region. */
181 if (lo >= hi && hi != 0)
183 printf_unfiltered (_("invalid memory region: low >= high\n"));
187 mem_region_init (&newobj);
191 ix = VEC_lower_bound (mem_region_s, mem_region_list, &newobj,
192 mem_region_lessthan);
194 /* Check for an overlapping memory region. We only need to check
195 in the vicinity - at most one before and one after the
197 for (i = ix - 1; i < ix + 1; i++)
199 struct mem_region *n;
203 if (i >= VEC_length (mem_region_s, mem_region_list))
206 n = VEC_index (mem_region_s, mem_region_list, i);
208 if ((lo >= n->lo && (lo < n->hi || n->hi == 0))
209 || (hi > n->lo && (hi <= n->hi || n->hi == 0))
210 || (lo <= n->lo && ((hi >= n->hi && n->hi != 0) || hi == 0)))
212 printf_unfiltered (_("overlapping memory region\n"));
217 newobj.number = ++mem_number;
218 newobj.attrib = *attrib;
219 VEC_safe_insert (mem_region_s, mem_region_list, ix, &newobj);
223 * Look up the memory region cooresponding to ADDR.
226 lookup_mem_region (CORE_ADDR addr)
228 static struct mem_region region;
229 struct mem_region *m;
234 require_target_regions ();
236 /* First we initialize LO and HI so that they describe the entire
237 memory space. As we process the memory region chain, they are
238 redefined to describe the minimal region containing ADDR. LO
239 and HI are used in the case where no memory region is defined
240 that contains ADDR. If a memory region is disabled, it is
241 treated as if it does not exist. The initial values for LO
242 and HI represent the bottom and top of memory. */
247 /* Either find memory range containing ADDRESS, or set LO and HI
248 to the nearest boundaries of an existing memory range.
250 If we ever want to support a huge list of memory regions, this
251 check should be replaced with a binary search (probably using
253 for (ix = 0; VEC_iterate (mem_region_s, mem_region_list, ix, m); ix++)
255 if (m->enabled_p == 1)
257 /* If the address is in the memory region, return that
259 if (addr >= m->lo && (addr < m->hi || m->hi == 0))
262 /* This (correctly) won't match if m->hi == 0, representing
263 the top of the address space, because CORE_ADDR is unsigned;
264 no value of LO is less than zero. */
265 if (addr >= m->hi && lo < m->hi)
268 /* This will never set HI to zero; if we're here and ADDR
269 is at or below M, and the region starts at zero, then ADDR
270 would have been in the region. */
271 if (addr <= m->lo && (hi == 0 || hi > m->lo))
276 /* Because no region was found, we must cons up one based on what
277 was learned above. */
281 /* When no memory map is defined at all, we always return
282 'default_mem_attrib', so that we do not make all memory
283 inaccessible for targets that don't provide a memory map. */
284 if (inaccessible_by_default && !VEC_empty (mem_region_s, mem_region_list))
285 region.attrib = unknown_mem_attrib;
287 region.attrib = default_mem_attrib;
292 /* Invalidate any memory regions fetched from the target. */
295 invalidate_target_mem_regions (void)
297 if (!target_mem_regions_valid)
300 target_mem_regions_valid = 0;
301 VEC_free (mem_region_s, target_mem_region_list);
303 mem_region_list = NULL;
306 /* Clear memory region list. */
311 VEC_free (mem_region_s, mem_region_list);
316 mem_command (char *args, int from_tty)
320 struct mem_attrib attrib;
323 error_no_arg (_("No mem"));
325 /* For "mem auto", switch back to using a target provided list. */
326 if (strcmp (args, "auto") == 0)
331 if (mem_region_list != target_mem_region_list)
334 mem_region_list = target_mem_region_list;
341 require_user_regions (from_tty);
343 tok = strtok (args, " \t");
345 error (_("no lo address"));
346 lo = parse_and_eval_address (tok);
348 tok = strtok (NULL, " \t");
350 error (_("no hi address"));
351 hi = parse_and_eval_address (tok);
353 attrib = default_mem_attrib;
354 while ((tok = strtok (NULL, " \t")) != NULL)
356 if (strcmp (tok, "rw") == 0)
357 attrib.mode = MEM_RW;
358 else if (strcmp (tok, "ro") == 0)
359 attrib.mode = MEM_RO;
360 else if (strcmp (tok, "wo") == 0)
361 attrib.mode = MEM_WO;
363 else if (strcmp (tok, "8") == 0)
364 attrib.width = MEM_WIDTH_8;
365 else if (strcmp (tok, "16") == 0)
367 if ((lo % 2 != 0) || (hi % 2 != 0))
368 error (_("region bounds not 16 bit aligned"));
369 attrib.width = MEM_WIDTH_16;
371 else if (strcmp (tok, "32") == 0)
373 if ((lo % 4 != 0) || (hi % 4 != 0))
374 error (_("region bounds not 32 bit aligned"));
375 attrib.width = MEM_WIDTH_32;
377 else if (strcmp (tok, "64") == 0)
379 if ((lo % 8 != 0) || (hi % 8 != 0))
380 error (_("region bounds not 64 bit aligned"));
381 attrib.width = MEM_WIDTH_64;
385 else if (strcmp (tok, "hwbreak") == 0)
387 else if (strcmp (tok, "swbreak") == 0)
391 else if (strcmp (tok, "cache") == 0)
393 else if (strcmp (tok, "nocache") == 0)
397 else if (strcmp (tok, "verify") == 0)
399 else if (strcmp (tok, "noverify") == 0)
404 error (_("unknown attribute: %s"), tok);
407 create_mem_region (lo, hi, &attrib);
412 info_mem_command (char *args, int from_tty)
414 struct mem_region *m;
415 struct mem_attrib *attrib;
419 printf_filtered (_("Using memory regions provided by the target.\n"));
421 printf_filtered (_("Using user-defined memory regions.\n"));
423 require_target_regions ();
425 if (!mem_region_list)
427 printf_unfiltered (_("There are no memory regions defined.\n"));
431 printf_filtered ("Num ");
432 printf_filtered ("Enb ");
433 printf_filtered ("Low Addr ");
434 if (gdbarch_addr_bit (target_gdbarch ()) > 32)
435 printf_filtered (" ");
436 printf_filtered ("High Addr ");
437 if (gdbarch_addr_bit (target_gdbarch ()) > 32)
438 printf_filtered (" ");
439 printf_filtered ("Attrs ");
440 printf_filtered ("\n");
442 for (ix = 0; VEC_iterate (mem_region_s, mem_region_list, ix, m); ix++)
446 printf_filtered ("%-3d %-3c\t",
448 m->enabled_p ? 'y' : 'n');
449 if (gdbarch_addr_bit (target_gdbarch ()) <= 32)
450 tmp = hex_string_custom (m->lo, 8);
452 tmp = hex_string_custom (m->lo, 16);
454 printf_filtered ("%s ", tmp);
456 if (gdbarch_addr_bit (target_gdbarch ()) <= 32)
461 tmp = hex_string_custom (m->hi, 8);
466 tmp = "0x10000000000000000";
468 tmp = hex_string_custom (m->hi, 16);
471 printf_filtered ("%s ", tmp);
473 /* Print a token for each attribute.
475 * FIXME: Should we output a comma after each token? It may
476 * make it easier for users to read, but we'd lose the ability
477 * to cut-and-paste the list of attributes when defining a new
478 * region. Perhaps that is not important.
480 * FIXME: If more attributes are added to GDB, the output may
481 * become cluttered and difficult for users to read. At that
482 * time, we may want to consider printing tokens only if they
483 * are different from the default attribute. */
486 switch (attrib->mode)
489 printf_filtered ("rw ");
492 printf_filtered ("ro ");
495 printf_filtered ("wo ");
498 printf_filtered ("flash blocksize 0x%x ", attrib->blocksize);
502 switch (attrib->width)
505 printf_filtered ("8 ");
508 printf_filtered ("16 ");
511 printf_filtered ("32 ");
514 printf_filtered ("64 ");
516 case MEM_WIDTH_UNSPECIFIED:
522 printf_filtered ("hwbreak");
524 printf_filtered ("swbreak");
528 printf_filtered ("cache ");
530 printf_filtered ("nocache ");
534 printf_filtered ("verify ");
536 printf_filtered ("noverify ");
539 printf_filtered ("\n");
541 gdb_flush (gdb_stdout);
546 /* Enable the memory region number NUM. */
551 struct mem_region *m;
554 for (ix = 0; VEC_iterate (mem_region_s, mem_region_list, ix, m); ix++)
555 if (m->number == num)
560 printf_unfiltered (_("No memory region number %d.\n"), num);
564 enable_mem_command (char *args, int from_tty)
567 struct mem_region *m;
570 require_user_regions (from_tty);
572 target_dcache_invalidate ();
574 if (args == NULL || *args == '\0')
575 { /* Enable all mem regions. */
576 for (ix = 0; VEC_iterate (mem_region_s, mem_region_list, ix, m); ix++)
581 number_or_range_parser parser (args);
582 while (!parser.finished ())
584 num = parser.get_number ();
591 /* Disable the memory region number NUM. */
594 mem_disable (int num)
596 struct mem_region *m;
599 for (ix = 0; VEC_iterate (mem_region_s, mem_region_list, ix, m); ix++)
600 if (m->number == num)
605 printf_unfiltered (_("No memory region number %d.\n"), num);
609 disable_mem_command (char *args, int from_tty)
611 require_user_regions (from_tty);
613 target_dcache_invalidate ();
615 if (args == NULL || *args == '\0')
617 struct mem_region *m;
620 for (ix = 0; VEC_iterate (mem_region_s, mem_region_list, ix, m); ix++)
625 number_or_range_parser parser (args);
626 while (!parser.finished ())
628 int num = parser.get_number ();
634 /* Delete the memory region number NUM. */
639 struct mem_region *m;
642 if (!mem_region_list)
644 printf_unfiltered (_("No memory region number %d.\n"), num);
648 for (ix = 0; VEC_iterate (mem_region_s, mem_region_list, ix, m); ix++)
649 if (m->number == num)
654 printf_unfiltered (_("No memory region number %d.\n"), num);
658 VEC_ordered_remove (mem_region_s, mem_region_list, ix);
662 delete_mem_command (char *args, int from_tty)
664 require_user_regions (from_tty);
666 target_dcache_invalidate ();
668 if (args == NULL || *args == '\0')
670 if (query (_("Delete all memory regions? ")))
676 number_or_range_parser parser (args);
677 while (!parser.finished ())
679 int num = parser.get_number ();
687 dummy_cmd (char *args, int from_tty)
691 extern initialize_file_ftype _initialize_mem; /* -Wmissing-prototype */
693 static struct cmd_list_element *mem_set_cmdlist;
694 static struct cmd_list_element *mem_show_cmdlist;
697 _initialize_mem (void)
699 add_com ("mem", class_vars, mem_command, _("\
700 Define attributes for memory region or reset memory region handling to\n\
703 mem <lo addr> <hi addr> [<mode> <width> <cache>],\n\
704 where <mode> may be rw (read/write), ro (read-only) or wo (write-only),\n\
705 <width> may be 8, 16, 32, or 64, and\n\
706 <cache> may be cache or nocache"));
708 add_cmd ("mem", class_vars, enable_mem_command, _("\
709 Enable memory region.\n\
710 Arguments are the code numbers of the memory regions to enable.\n\
711 Usage: enable mem <code number>...\n\
712 Do \"info mem\" to see current list of code numbers."), &enablelist);
714 add_cmd ("mem", class_vars, disable_mem_command, _("\
715 Disable memory region.\n\
716 Arguments are the code numbers of the memory regions to disable.\n\
717 Usage: disable mem <code number>...\n\
718 Do \"info mem\" to see current list of code numbers."), &disablelist);
720 add_cmd ("mem", class_vars, delete_mem_command, _("\
721 Delete memory region.\n\
722 Arguments are the code numbers of the memory regions to delete.\n\
723 Usage: delete mem <code number>...\n\
724 Do \"info mem\" to see current list of code numbers."), &deletelist);
726 add_info ("mem", info_mem_command,
727 _("Memory region attributes"));
729 add_prefix_cmd ("mem", class_vars, dummy_cmd, _("\
730 Memory regions settings"),
731 &mem_set_cmdlist, "set mem ",
732 0/* allow-unknown */, &setlist);
733 add_prefix_cmd ("mem", class_vars, dummy_cmd, _("\
734 Memory regions settings"),
735 &mem_show_cmdlist, "show mem ",
736 0/* allow-unknown */, &showlist);
738 add_setshow_boolean_cmd ("inaccessible-by-default", no_class,
739 &inaccessible_by_default, _("\
740 Set handling of unknown memory regions."), _("\
741 Show handling of unknown memory regions."), _("\
742 If on, and some memory map is defined, debugger will emit errors on\n\
743 accesses to memory not defined in the memory map. If off, accesses to all\n\
744 memory addresses will be allowed."),
746 show_inaccessible_by_default,