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 "genesis/static-symbols.h"
  37 #include "primitive-objects.h"
  38
  39
  40
  41 /* When we need to do command input, we use this stream, which is not
  42  * in general stdin, so that things will "work" (as well as being
  43  * thrown into ldb can be considered "working":-) even in a process
  44  * where standard input has been redirected to a file or pipe.
  45  *
  46  * (We could set up output to go to a special ldb_out stream for the
  47  * same reason, but there's been no pressure for that so far.)
  48  *
  49  * The enter-the-ldb-monitor function is responsible for setting up
  50  * this stream. */
  51 static FILE *ldb_in = 0;
  52 static int ldb_in_fd = -1;
  53
  54 typedef void cmd(char **ptr);
  55
  56 static cmd dump_cmd, print_cmd, quit_cmd, help_cmd;
  57 static cmd flush_cmd, search_cmd, regs_cmd, exit_cmd;
  58 static cmd print_context_cmd;
  59 static cmd backtrace_cmd, purify_cmd, catchers_cmd;
  60 static cmd grab_sigs_cmd;
  61 static cmd kill_cmd;
  62
  63 static struct cmd {
  64     char *cmd, *help;
  65     void (*fn)(char **ptr);
  66 } supported_cmds[] = {
  67     {"help", "Display this help information.", help_cmd},
  68     {"?", "(an alias for help)", help_cmd},
  69     {"backtrace", "Backtrace up to N frames.", backtrace_cmd},
  70     {"catchers", "Print a list of all the active catchers.", catchers_cmd},
  71     {"context", "Print interrupt context number I.", print_context_cmd},
  72     {"dump", "Dump memory starting at ADDRESS for COUNT words.", dump_cmd},
  73     {"d", "(an alias for dump)", dump_cmd},
  74     {"exit", "Exit this instance of the monitor.", exit_cmd},
  75     {"flush", "Flush all temp variables.", flush_cmd},
  76     /* (Classic CMU CL had a "gc" command here, which seems like a
  77      * reasonable idea, but the code was stale (incompatible with
  78      * gencgc) so I just flushed it. -- WHN 20000814 */
  79     {"grab-signals", "Set the signal handlers to call LDB.", grab_sigs_cmd},
  80     {"kill", "Kill ourself with signal number N (useful if running under gdb)",
  81      kill_cmd},
  82     {"purify", "Purify. (Caveat purifier!)", purify_cmd},
  83     {"print", "Print object at ADDRESS.", print_cmd},
  84     {"p", "(an alias for print)", print_cmd},
  85     {"quit", "Quit.", quit_cmd},
  86     {"regs", "Display current Lisp registers.", regs_cmd},
  87     {"search", "Search for TYPE starting at ADDRESS for a max of COUNT words.", search_cmd},
  88     {"s", "(an alias for search)", search_cmd},
  89     {NULL, NULL, NULL}
  90 };
  91
  92 static jmp_buf curbuf;
  93
  94 static int
  95 visible(unsigned char c)
  96 {
  97     if (c < ' ' || c > '~')
  98         return ' ';
  99     else
 100         return c;
 101 }
 102
 103 static void
 104 dump_cmd(char **ptr)
 105 {
 106     static char *lastaddr = 0;
 107     static int lastcount = 20;
 108
 109     char *addr = lastaddr;
 110     int count = lastcount, displacement;
 111
 112     if (more_p(ptr)) {
 113         addr = parse_addr(ptr);
 114
 115         if (more_p(ptr))
 116             count = parse_number(ptr);
 117     }
 118
 119     if (count == 0) {
 120         printf("COUNT must be non-zero.\n");
 121         return;
 122     }
 123
 124     lastcount = count;
 125
 126     if (count > 0)
 127         displacement = 4;
 128     else {
 129         displacement = -4;
 130         count = -count;
 131     }
 132
 133     while (count-- > 0) {
 134 #ifndef alpha
 135         printf("0x%08lX: ", (unsigned long) addr);
 136 #else
 137         printf("0x%08X: ", (u32) addr);
 138 #endif
 139         if (is_valid_lisp_addr((os_vm_address_t)addr)) {
 140 #ifndef alpha
 141             unsigned long *lptr = (unsigned long *)addr;
 142 #else
 143             u32 *lptr = (u32 *)addr;
 144 #endif
 145             unsigned short *sptr = (unsigned short *)addr;
 146             unsigned char *cptr = (unsigned char *)addr;
 147
 148             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]));
 149         }
 150         else
 151             printf("invalid Lisp-level address\n");
 152
 153         addr += displacement;
 154     }
 155
 156     lastaddr = addr;
 157 }
 158
 159 static void
 160 print_cmd(char **ptr)
 161 {
 162     lispobj obj = parse_lispobj(ptr);
 163
 164     print(obj);
 165 }
 166
 167 static void
 168 kill_cmd(char **ptr)
 169 {
 170     kill(getpid(), parse_number(ptr));
 171 }
 172
 173 static void
 174 regs_cmd(char **ptr)
 175 {
 176     printf("CSP\t=\t0x%08lX\n", (unsigned long)current_control_stack_pointer);
 177     printf("FP\t=\t0x%08lX\n", (unsigned long)current_control_frame_pointer);
 178 #if !defined(__i386__)
 179     printf("BSP\t=\t0x%08X\n", (unsigned long)current_binding_stack_pointer);
 180 #endif
 181 #ifdef __i386__
 182     printf("BSP\t=\t0x%08lx\n",
 183            (unsigned long)SymbolValue(BINDING_STACK_POINTER));
 184 #endif
 185
 186     printf("DYNAMIC\t=\t0x%08lx\n", (unsigned long)DYNAMIC_SPACE_START);
 187 #if defined(__i386__)
 188     printf("ALLOC\t=\t0x%08lx\n",
 189            (unsigned long)SymbolValue(ALLOCATION_POINTER));
 190 #else
 191     printf("ALLOC\t=\t0x%08X\n",
 192            (unsigned long)dynamic_space_free_pointer);
 193     printf("TRIGGER\t=\t0x%08lx\n", (unsigned long)current_auto_gc_trigger);
 194 #endif
 195     printf("STATIC\t=\t0x%08lx\n",
 196            (unsigned long)SymbolValue(STATIC_SPACE_FREE_POINTER));
 197     printf("RDONLY\t=\t0x%08lx\n",
 198            (unsigned long)SymbolValue(READ_ONLY_SPACE_FREE_POINTER));
 199
 200 #ifdef MIPS
 201     printf("FLAGS\t=\t0x%08x\n", current_flags_register);
 202 #endif
 203 }
 204
 205 static void
 206 search_cmd(char **ptr)
 207 {
 208     static int lastval = 0, lastcount = 0;
 209     static lispobj *start = 0, *end = 0;
 210     int val, count;
 211     lispobj *addr, obj;
 212
 213     if (more_p(ptr)) {
 214         val = parse_number(ptr);
 215         if (val < 0 || val > 0xff) {
 216             printf("can only search for single bytes\n");
 217             return;
 218         }
 219         if (more_p(ptr)) {
 220             addr = (lispobj *)native_pointer((long)parse_addr(ptr));
 221             if (more_p(ptr)) {
 222                 count = parse_number(ptr);
 223             }
 224             else {
 225                 /* Specified value and address, but no count. Only one. */
 226                 count = -1;
 227             }
 228         }
 229         else {
 230             /* Specified a value, but no address, so search same range. */
 231             addr = start;
 232             count = lastcount;
 233         }
 234     }
 235     else {
 236         /* Specified nothing, search again for val. */
 237         val = lastval;
 238         addr = end;
 239         count = lastcount;
 240     }
 241
 242     lastval = val;
 243     start = end = addr;
 244     lastcount = count;
 245
 246     printf("searching for 0x%x at 0x%08lX\n", val, (unsigned long)end);
 247
 248     while (search_for_type(val, &end, &count)) {
 249         printf("found 0x%x at 0x%08lX:\n", val, (unsigned long)end);
 250         obj = *end;
 251         addr = end;
 252         end += 2;
 253         if (widetag_of(obj) == SIMPLE_FUN_HEADER_WIDETAG) {
 254             print((long)addr | FUN_POINTER_LOWTAG);
 255         } else if (lowtag_of(obj) == OTHER_IMMEDIATE_0_LOWTAG ||
 256                    lowtag_of(obj) == OTHER_IMMEDIATE_1_LOWTAG) {
 257             print((lispobj)addr | OTHER_POINTER_LOWTAG);
 258         } else {
 259             print((lispobj)addr);
 260         } if (count == -1) {
 261             return;
 262         }
 263     }
 264 }
 265
 266 /* (There used to be call_cmd() here, to call known-at-cold-init-time
 267  * Lisp functions from ldb, but it bitrotted and was deleted in
 268  * sbcl-0.7.5.1. See older CVS versions if you want to resuscitate
 269  * it.) */
 270
 271 static void
 272 flush_cmd(char **ptr)
 273 {
 274     flush_vars();
 275 }
 276
 277 static void
 278 quit_cmd(char **ptr)
 279 {
 280     char buf[10];
 281
 282     printf("Really quit? [y] ");
 283     fflush(stdout);
 284     fgets(buf, sizeof(buf), ldb_in);
 285     if (buf[0] == 'y' || buf[0] == 'Y' || buf[0] == '\n')
 286         exit(0);
 287 }
 288
 289 static void
 290 help_cmd(char **ptr)
 291 {
 292     struct cmd *cmd;
 293
 294     for (cmd = supported_cmds; cmd->cmd != NULL; cmd++)
 295         if (cmd->help != NULL)
 296             printf("%s\t%s\n", cmd->cmd, cmd->help);
 297 }
 298
 299 static int done;
 300
 301 static void
 302 exit_cmd(char **ptr)
 303 {
 304     done = 1;
 305 }
 306
 307 static void
 308 purify_cmd(char **ptr)
 309 {
 310     purify(NIL, NIL);
 311 }
 312
 313 static void
 314 print_context(os_context_t *context)
 315 {
 316     int i;
 317
 318     for (i = 0; i < NREGS; i++) {
 319         printf("%s:\t", lisp_register_names[i]);
 320 #ifdef __i386__
 321         brief_print((lispobj)(*os_context_register_addr(context,
 322                                                         i*2)));
 323 #else
 324         brief_print((lispobj)(*os_context_register_addr(context,i)));
 325 #endif
 326     }
 327     printf("PC:\t\t  0x%08lx\n",
 328            (unsigned long)(*os_context_pc_addr(context)));
 329 }
 330
 331 static void
 332 print_context_cmd(char **ptr)
 333 {
 334     int free;
 335
 336     free = SymbolValue(FREE_INTERRUPT_CONTEXT_INDEX)>>2;
 337
 338     if (more_p(ptr)) {
 339         int index;
 340
 341         index = parse_number(ptr);
 342
 343         if ((index >= 0) && (index < free)) {
 344             printf("There are %d interrupt contexts.\n", free);
 345             printf("printing context %d\n", index);
 346             print_context(lisp_interrupt_contexts[index]);
 347         } else {
 348             printf("There aren't that many/few contexts.\n");
 349             printf("There are %d interrupt contexts.\n", free);
 350         }
 351     } else {
 352         if (free == 0)
 353             printf("There are no interrupt contexts!\n");
 354         else {
 355             printf("There are %d interrupt contexts.\n", free);
 356             printf("printing context %d\n", free - 1);
 357             print_context(lisp_interrupt_contexts[free - 1]);
 358         }
 359     }
 360 }
 361
 362 static void
 363 backtrace_cmd(char **ptr)
 364 {
 365     void backtrace(int frames);
 366     int n;
 367
 368     if (more_p(ptr))
 369         n = parse_number(ptr);
 370     else
 371         n = 100;
 372
 373     printf("Backtrace:\n");
 374     backtrace(n);
 375 }
 376
 377 static void
 378 catchers_cmd(char **ptr)
 379 {
 380     struct catch_block *catch;
 381
 382     catch = (struct catch_block *)SymbolValue(CURRENT_CATCH_BLOCK);
 383
 384     if (catch == NULL)
 385         printf("There are no active catchers!\n");
 386     else {
 387         while (catch != NULL) {
 388 #ifndef __i386__
 389             printf("0x%08lX:\n\tuwp: 0x%08lX\n\tfp: 0x%08lX\n\tcode: 0x%08lx\n\tentry: 0x%08lx\n\ttag: ",
 390                    (unsigned long)catch, (unsigned long)(catch->current_uwp),
 391                    (unsigned long)(catch->current_cont),
 392                    catch->current_code,
 393                    catch->entry_pc);
 394 #else
 395             printf("0x%08lX:\n\tuwp: 0x%08lX\n\tfp: 0x%08lX\n\tcode: 0x%08lx\n\tentry: 0x%08lx\n\ttag: ",
 396                    (unsigned long)catch, (unsigned long)(catch->current_uwp),
 397                    (unsigned long)(catch->current_cont),
 398                    (unsigned long)component_ptr_from_pc((void*)catch->entry_pc) +
 399                    OTHER_POINTER_LOWTAG,
 400                    (unsigned long)catch->entry_pc);
 401 #endif
 402             brief_print((lispobj)catch->tag);
 403             catch = catch->previous_catch;
 404         }
 405     }
 406 }
 407
 408 static void
 409 grab_sigs_cmd(char **ptr)
 410 {
 411     extern void sigint_init(void);
 412
 413     printf("Grabbing signals.\n");
 414     sigint_init();
 415 }
 416
 417 static void
 418 sub_monitor(void)
 419 {
 420     struct cmd *cmd, *found;
 421     char buf[256];
 422     char *line, *ptr, *token;
 423     int ambig;
 424
 425     if (!ldb_in) {
 426         ldb_in = fopen("/dev/tty","r+");
 427         ldb_in_fd = fileno(ldb_in);
 428     }
 429
 430     while (!done) {
 431         printf("ldb> ");
 432         fflush(stdout);
 433         line = fgets(buf, sizeof(buf), ldb_in);
 434         if (line == NULL) {
 435             if (isatty(ldb_in_fd)) {
 436                 putchar('\n');
 437                 continue;
 438             }
 439             else {
 440                 fprintf(stderr, "\nEOF on something other than a tty.\n");
 441                 exit(0);
 442             }
 443         }
 444         ptr = line;
 445         if ((token = parse_token(&ptr)) == NULL)
 446             continue;
 447         ambig = 0;
 448         found = NULL;
 449         for (cmd = supported_cmds; cmd->cmd != NULL; cmd++) {
 450             if (strcmp(token, cmd->cmd) == 0) {
 451                 found = cmd;
 452                 ambig = 0;
 453                 break;
 454             }
 455             else if (strncmp(token, cmd->cmd, strlen(token)) == 0) {
 456                 if (found)
 457                     ambig = 1;
 458                 else
 459                     found = cmd;
 460             }
 461         }
 462         if (ambig)
 463             printf("``%s'' is ambiguous.\n", token);
 464         else if (found == NULL)
 465             printf("unknown command: ``%s''\n", token);
 466         else {
 467             reset_printer();
 468             (*found->fn)(&ptr);
 469         }
 470     }
 471 }
 472
 473 void
 474 ldb_monitor()
 475 {
 476     jmp_buf oldbuf;
 477
 478     bcopy(curbuf, oldbuf, sizeof(oldbuf));
 479
 480     printf("LDB monitor\n");
 481
 482     setjmp(curbuf);
 483
 484     sub_monitor();
 485
 486     done = 0;
 487
 488     bcopy(oldbuf, curbuf, sizeof(curbuf));
 489 }
 490
 491 void
 492 throw_to_monitor()
 493 {
 494     longjmp(curbuf, 1);
 495 }
 496
 497 #endif /* defined(LISP_FEATURE_SB_LDB) */
 498
 499 /* what we do when things go badly wrong at a low level */
 500 void
 501 monitor_or_something()
 502 {
 503 #if defined(LISP_FEATURE_SB_LDB)
 504     ldb_monitor();
 505 #else
 506     fprintf(stderr, "There's no LDB in this build; exiting.\n");
 507     exit(1);
 508 #endif
 509 }