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