src/runtime/monitor.c

   1 /*
   2  * This software is part of the SBCL system. See the README file for
   3  * more information.
   4  *
   5  * This software is derived from the CMU CL system, which was
   6  * written at Carnegie Mellon University and released into the
   7  * public domain. The software is in the public domain and is
   8  * provided with absolutely no warranty. See the COPYING and CREDITS
   9  * files for more information.
  10  */
  11
  12 #include <stdio.h>
  13 #include <sys/types.h>
  14 #include <stdlib.h>
  15 #include <setjmp.h>
  16 #include <sys/time.h>
  17 #include <sys/resource.h>
  18 #include <signal.h>
  19 #include <unistd.h>
  20
  21 #include "runtime.h"
  22 #include "sbcl.h"
  23
  24 /* Almost all of this file can be skipped if we're not supporting LDB. */
  25 #if defined(LISP_FEATURE_SB_LDB)
  26
  27 #include "print.h"
  28 #include "arch.h"
  29 #include "interr.h"
  30 #include "gc.h"
  31 #include "search.h"
  32 #include "purify.h"
  33 #include "globals.h"
  34 #include "lispregs.h"
  35 #include "interrupt.h"
  36 #include "thread.h"
  37 #include "genesis/static-symbols.h"
  38 #include "genesis/primitive-objects.h"
  39
  40
  41
  42 /* When we need to do command input, we use this stream, which is not
  43  * in general stdin, so that things will "work" (as well as being
  44  * thrown into ldb can be considered "working":-) even in a process
  45  * where standard input has been redirected to a file or pipe.
  46  *
  47  * (We could set up output to go to a special ldb_out stream for the
  48  * same reason, but there's been no pressure for that so far.)
  49  *
  50  * The enter-the-ldb-monitor function is responsible for setting up
  51  * this stream. */
  52 static FILE *ldb_in = 0;
  53 static int ldb_in_fd = -1;
  54
  55 typedef void cmd(char **ptr);
  56
  57 static cmd dump_cmd, print_cmd, quit_cmd, help_cmd;
  58 static cmd flush_cmd, search_cmd, regs_cmd, exit_cmd;
  59 static cmd print_context_cmd;
  60 static cmd backtrace_cmd, purify_cmd, catchers_cmd;
  61 static cmd grab_sigs_cmd;
  62 static cmd kill_cmd;
  63
  64 static struct cmd {
  65     char *cmd, *help;
  66     void (*fn)(char **ptr);
  67 } supported_cmds[] = {
  68     {"help", "Display this help information.", help_cmd},
  69     {"?", "(an alias for help)", help_cmd},
  70     {"backtrace", "Backtrace up to N frames.", backtrace_cmd},
  71     {"catchers", "Print a list of all the active catchers.", catchers_cmd},
  72     {"context", "Print interrupt context number I.", print_context_cmd},
  73     {"dump", "Dump memory starting at ADDRESS for COUNT words.", dump_cmd},
  74     {"d", "(an alias for dump)", dump_cmd},
  75     {"exit", "Exit this instance of the monitor.", exit_cmd},
  76     {"flush", "Flush all temp variables.", flush_cmd},
  77     /* (Classic CMU CL had a "gc" command here, which seems like a
  78      * reasonable idea, but the code was stale (incompatible with
  79      * gencgc) so I just flushed it. -- WHN 20000814 */
  80     {"grab-signals", "Set the signal handlers to call LDB.", grab_sigs_cmd},
  81     {"kill", "Kill ourself with signal number N (useful if running under gdb)",
  82      kill_cmd},
  83     {"purify", "Purify. (Caveat purifier!)", purify_cmd},
  84     {"print", "Print object at ADDRESS.", print_cmd},
  85     {"p", "(an alias for print)", print_cmd},
  86     {"quit", "Quit.", quit_cmd},
  87     {"regs", "Display current Lisp registers.", regs_cmd},
  88     {"search", "Search for TYPE starting at ADDRESS for a max of COUNT words.", search_cmd},
  89     {"s", "(an alias for search)", search_cmd},
  90     {NULL, NULL, NULL}
  91 };
  92
  93 static jmp_buf curbuf;
  94
  95 static int
  96 visible(unsigned char c)
  97 {
  98     if (c < ' ' || c > '~')
  99         return ' ';
 100     else
 101         return c;
 102 }
 103
 104 static void
 105 dump_cmd(char **ptr)
 106 {
 107     static char *lastaddr = 0;
 108     static int lastcount = 20;
 109
 110     char *addr = lastaddr;
 111     int count = lastcount, displacement;
 112
 113     if (more_p(ptr)) {
 114         addr = parse_addr(ptr);
 115
 116         if (more_p(ptr))
 117             count = parse_number(ptr);
 118     }
 119
 120     if (count == 0) {
 121         printf("COUNT must be non-zero.\n");
 122         return;
 123     }
 124
 125     lastcount = count;
 126
 127     if (count > 0)
 128         displacement = 4;
 129     else {
 130         displacement = -4;
 131         count = -count;
 132     }
 133
 134     while (count-- > 0) {
 135 #ifndef alpha
 136         printf("0x%08lX: ", (unsigned long) addr);
 137 #else
 138         printf("0x%08X: ", (u32) addr);
 139 #endif
 140         if (is_valid_lisp_addr((os_vm_address_t)addr)) {
 141 #ifndef alpha
 142             unsigned long *lptr = (unsigned long *)addr;
 143 #else
 144             u32 *lptr = (u32 *)addr;
 145 #endif
 146             unsigned short *sptr = (unsigned short *)addr;
 147             unsigned char *cptr = (unsigned char *)addr;
 148
 149             printf("0x%08lx   0x%04x 0x%04x   0x%02x 0x%02x 0x%02x 0x%02x    %c%c%c%c\n", lptr[0], sptr[0], sptr[1], cptr[0], cptr[1], cptr[2], cptr[3], visible(cptr[0]), visible(cptr[1]), visible(cptr[2]), visible(cptr[3]));
 150         }
 151         else
 152             printf("invalid Lisp-level address\n");
 153
 154         addr += displacement;
 155     }
 156
 157     lastaddr = addr;
 158 }
 159
 160 static void
 161 print_cmd(char **ptr)
 162 {
 163     lispobj obj = parse_lispobj(ptr);
 164
 165     print(obj);
 166 }
 167
 168 static void
 169 kill_cmd(char **ptr)
 170 {
 171     kill(getpid(), parse_number(ptr));
 172 }
 173
 174 static void
 175 regs_cmd(char **ptr)
 176 {
 177     printf("CSP\t=\t0x%08lX\n", (unsigned long)current_control_stack_pointer);
 178     printf("FP\t=\t0x%08lX\n", (unsigned long)current_control_frame_pointer);
 179 #if !defined(LISP_FEATURE_X86)
 180     printf("BSP\t=\t0x%08X\n", (unsigned long)current_binding_stack_pointer);
 181 #endif
 182 #if 0
 183 #ifdef LISP_FEATURE_X86
 184     printf("BSP\t=\t0x%08lx\n",
 185            (unsigned long)SymbolValue(BINDING_STACK_POINTER));
 186 #endif
 187
 188     printf("DYNAMIC\t=\t0x%08lx\n", (unsigned long)DYNAMIC_SPACE_START);
 189 #if defined(LISP_FEATURE_X86)
 190     printf("ALLOC\t=\t0x%08lx\n",
 191            (unsigned long)SymbolValue(ALLOCATION_POINTER));
 192 #else
 193     printf("ALLOC\t=\t0x%08X\n",
 194            (unsigned long)dynamic_space_free_pointer);
 195     printf("TRIGGER\t=\t0x%08lx\n", (unsigned long)current_auto_gc_trigger);
 196 #endif
 197     printf("STATIC\t=\t0x%08lx\n",
 198            (unsigned long)SymbolValue(STATIC_SPACE_FREE_POINTER));
 199     printf("RDONLY\t=\t0x%08lx\n",
 200            (unsigned long)SymbolValue(READ_ONLY_SPACE_FREE_POINTER));
 201 #endif /* 0 */
 202 #ifdef MIPS
 203     printf("FLAGS\t=\t0x%08x\n", current_flags_register);
 204 #endif
 205 }
 206
 207 static void
 208 search_cmd(char **ptr)
 209 {
 210     static int lastval = 0, lastcount = 0;
 211     static lispobj *start = 0, *end = 0;
 212     int val, count;
 213     lispobj *addr, obj;
 214
 215     if (more_p(ptr)) {
 216         val = parse_number(ptr);
 217         if (val < 0 || val > 0xff) {
 218             printf("can only search for single bytes\n");
 219             return;
 220         }
 221         if (more_p(ptr)) {
 222             addr = (lispobj *)native_pointer((long)parse_addr(ptr));
 223             if (more_p(ptr)) {
 224                 count = parse_number(ptr);
 225             }
 226             else {
 227                 /* Specified value and address, but no count. Only one. */
 228                 count = -1;
 229             }
 230         }
 231         else {
 232             /* Specified a value, but no address, so search same range. */
 233             addr = start;
 234             count = lastcount;
 235         }
 236     }
 237     else {
 238         /* Specified nothing, search again for val. */
 239         val = lastval;
 240         addr = end;
 241         count = lastcount;
 242     }
 243
 244     lastval = val;
 245     start = end = addr;
 246     lastcount = count;
 247
 248     printf("searching for 0x%x at 0x%08lX\n", val, (unsigned long)end);
 249
 250     while (search_for_type(val, &end, &count)) {
 251         printf("found 0x%x at 0x%08lX:\n", val, (unsigned long)end);
 252         obj = *end;
 253         addr = end;
 254         end += 2;
 255         if (widetag_of(obj) == SIMPLE_FUN_HEADER_WIDETAG) {
 256             print((long)addr | FUN_POINTER_LOWTAG);
 257         } else if (lowtag_of(obj) == OTHER_IMMEDIATE_0_LOWTAG ||
 258                    lowtag_of(obj) == OTHER_IMMEDIATE_1_LOWTAG) {
 259             print((lispobj)addr | OTHER_POINTER_LOWTAG);
 260         } else {
 261             print((lispobj)addr);
 262         } if (count == -1) {
 263             return;
 264         }
 265     }
 266 }
 267
 268 /* (There used to be call_cmd() here, to call known-at-cold-init-time
 269  * Lisp functions from ldb, but it bitrotted and was deleted in
 270  * sbcl-0.7.5.1. See older CVS versions if you want to resuscitate
 271  * it.) */
 272
 273 static void
 274 flush_cmd(char **ptr)
 275 {
 276     flush_vars();
 277 }
 278
 279 static void
 280 quit_cmd(char **ptr)
 281 {
 282     char buf[10];
 283
 284     printf("Really quit? [y] ");
 285     fflush(stdout);
 286     fgets(buf, sizeof(buf), ldb_in);
 287     if (buf[0] == 'y' || buf[0] == 'Y' || buf[0] == '\n')
 288         exit(1);
 289 }
 290
 291 static void
 292 help_cmd(char **ptr)
 293 {
 294     struct cmd *cmd;
 295
 296     for (cmd = supported_cmds; cmd->cmd != NULL; cmd++)
 297         if (cmd->help != NULL)
 298             printf("%s\t%s\n", cmd->cmd, cmd->help);
 299 }
 300
 301 static int done;
 302
 303 static void
 304 exit_cmd(char **ptr)
 305 {
 306     done = 1;
 307 }
 308
 309 static void
 310 purify_cmd(char **ptr)
 311 {
 312     purify(NIL, NIL);
 313 }
 314
 315 static void
 316 print_context(os_context_t *context)
 317 {
 318     int i;
 319
 320     for (i = 0; i < NREGS; i++) {
 321         printf("%s:\t", lisp_register_names[i]);
 322 #ifdef LISP_FEATURE_X86
 323         brief_print((lispobj)(*os_context_register_addr(context,
 324                                                         i*2)));
 325 #else
 326         brief_print((lispobj)(*os_context_register_addr(context,i)));
 327 #endif
 328     }
 329 #ifdef LISP_FEATURE_DARWIN
 330     printf("DAR:\t\t 0x%08lx\n", (unsigned long)(*os_context_register_addr(context, 41)));
 331     printf("DSISR:\t\t 0x%08lx\n", (unsigned long)(*os_context_register_addr(context, 42)));
 332 #endif
 333     printf("PC:\t\t  0x%08lx\n",
 334            (unsigned long)(*os_context_pc_addr(context)));
 335 }
 336
 337 static void
 338 print_context_cmd(char **ptr)
 339 {
 340     int free;
 341     struct thread *thread=arch_os_get_current_thread();
 342
 343     free = SymbolValue(FREE_INTERRUPT_CONTEXT_INDEX,thread)>>2;
 344
 345     if (more_p(ptr)) {
 346         int index;
 347
 348         index = parse_number(ptr);
 349
 350         if ((index >= 0) && (index < free)) {
 351             printf("There are %d interrupt contexts.\n", free);
 352             printf("printing context %d\n", index);
 353             print_context(thread->interrupt_contexts[index]);
 354         } else {
 355             printf("There aren't that many/few contexts.\n");
 356             printf("There are %d interrupt contexts.\n", free);
 357         }
 358     } else {
 359         if (free == 0)
 360             printf("There are no interrupt contexts!\n");
 361         else {
 362             printf("There are %d interrupt contexts.\n", free);
 363             printf("printing context %d\n", free - 1);
 364             print_context(thread->interrupt_contexts[free - 1]);
 365         }
 366     }
 367 }
 368
 369 static void
 370 backtrace_cmd(char **ptr)
 371 {
 372     void backtrace(int frames);
 373     int n;
 374
 375     if (more_p(ptr))
 376         n = parse_number(ptr);
 377     else
 378         n = 100;
 379
 380     printf("Backtrace:\n");
 381     backtrace(n);
 382 }
 383
 384 static void
 385 catchers_cmd(char **ptr)
 386 {
 387     struct catch_block *catch;
 388     struct thread *thread=arch_os_get_current_thread();
 389
 390     catch = (struct catch_block *)SymbolValue(CURRENT_CATCH_BLOCK,thread);
 391
 392     if (catch == NULL)
 393         printf("There are no active catchers!\n");
 394     else {
 395         while (catch != NULL) {
 396 #ifndef LISP_FEATURE_X86
 397             printf("0x%08lX:\n\tuwp: 0x%08lX\n\tfp: 0x%08lX\n\tcode: 0x%08lx\n\tentry: 0x%08lx\n\ttag: ",
 398                    (unsigned long)catch, (unsigned long)(catch->current_uwp),
 399                    (unsigned long)(catch->current_cont),
 400                    catch->current_code,
 401                    catch->entry_pc);
 402 #else
 403             printf("0x%08lX:\n\tuwp: 0x%08lX\n\tfp: 0x%08lX\n\tcode: 0x%08lx\n\tentry: 0x%08lx\n\ttag: ",
 404                    (unsigned long)catch, (unsigned long)(catch->current_uwp),
 405                    (unsigned long)(catch->current_cont),
 406                    (unsigned long)component_ptr_from_pc((void*)catch->entry_pc) +
 407                    OTHER_POINTER_LOWTAG,
 408                    (unsigned long)catch->entry_pc);
 409 #endif
 410             brief_print((lispobj)catch->tag);
 411             catch = catch->previous_catch;
 412         }
 413     }
 414 }
 415
 416 static void
 417 grab_sigs_cmd(char **ptr)
 418 {
 419     extern void sigint_init(void);
 420
 421     printf("Grabbing signals.\n");
 422     sigint_init();
 423 }
 424
 425 static void
 426 sub_monitor(void)
 427 {
 428     struct cmd *cmd, *found;
 429     char buf[256];
 430     char *line, *ptr, *token;
 431     int ambig;
 432
 433     if (!ldb_in) {
 434         ldb_in = fopen("/dev/tty","r+");
 435         ldb_in_fd = fileno(ldb_in);
 436     }
 437
 438     while (!done) {
 439         printf("ldb> ");
 440         fflush(stdout);
 441         line = fgets(buf, sizeof(buf), ldb_in);
 442         if (line == NULL) {
 443             if (isatty(ldb_in_fd)) {
 444                 putchar('\n');
 445                 continue;
 446             }
 447             else {
 448                 fprintf(stderr, "\nEOF on something other than a tty.\n");
 449                 exit(0);
 450             }
 451         }
 452         ptr = line;
 453         if ((token = parse_token(&ptr)) == NULL)
 454             continue;
 455         ambig = 0;
 456         found = NULL;
 457         for (cmd = supported_cmds; cmd->cmd != NULL; cmd++) {
 458             if (strcmp(token, cmd->cmd) == 0) {
 459                 found = cmd;
 460                 ambig = 0;
 461                 break;
 462             }
 463             else if (strncmp(token, cmd->cmd, strlen(token)) == 0) {
 464                 if (found)
 465                     ambig = 1;
 466                 else
 467                     found = cmd;
 468             }
 469         }
 470         if (ambig)
 471             printf("``%s'' is ambiguous.\n", token);
 472         else if (found == NULL)
 473             printf("unknown command: ``%s''\n", token);
 474         else {
 475             reset_printer();
 476             (*found->fn)(&ptr);
 477         }
 478     }
 479 }
 480
 481 void
 482 ldb_monitor()
 483 {
 484     jmp_buf oldbuf;
 485
 486     bcopy(curbuf, oldbuf, sizeof(oldbuf));
 487
 488     printf("LDB monitor\n");
 489
 490     setjmp(curbuf);
 491
 492     sub_monitor();
 493
 494     done = 0;
 495
 496     bcopy(oldbuf, curbuf, sizeof(curbuf));
 497 }
 498
 499 void
 500 throw_to_monitor()
 501 {
 502     longjmp(curbuf, 1);
 503 }
 504
 505 #endif /* defined(LISP_FEATURE_SB_LDB) */
 506
 507 /* what we do when things go badly wrong at a low level */
 508 void
 509 monitor_or_something()
 510 {
 511 #if defined(LISP_FEATURE_SB_LDB)
 512     ldb_monitor();
 513 #else
 514     fprintf(stderr, "There's no LDB in this build; exiting.\n");
 515     exit(1);
 516 #endif
 517 }