The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/gdb/gdb_main.c

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    1 /*-
    2  * Copyright (c) 2004 Marcel Moolenaar
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  *
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/10.1/sys/gdb/gdb_main.c 234196 2012-04-12 21:34:58Z jhb $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/kdb.h>
   33 #include <sys/kernel.h>
   34 #include <sys/pcpu.h>
   35 #include <sys/proc.h>
   36 #include <sys/reboot.h>
   37 
   38 #include <machine/gdb_machdep.h>
   39 #include <machine/kdb.h>
   40 
   41 #include <gdb/gdb.h>
   42 #include <gdb/gdb_int.h>
   43 
   44 static dbbe_init_f gdb_init;
   45 static dbbe_trap_f gdb_trap;
   46 
   47 KDB_BACKEND(gdb, gdb_init, NULL, NULL, gdb_trap);
   48 
   49 static struct gdb_dbgport null_gdb_dbgport;
   50 DATA_SET(gdb_dbgport_set, null_gdb_dbgport);
   51 SET_DECLARE(gdb_dbgport_set, struct gdb_dbgport);
   52 
   53 struct gdb_dbgport *gdb_cur = NULL;
   54 int gdb_listening = 0;
   55 
   56 static int
   57 gdb_init(void)
   58 {
   59         struct gdb_dbgport *dp, **iter;
   60         int cur_pri, pri;
   61 
   62         gdb_cur = NULL;
   63         cur_pri = -1;
   64         SET_FOREACH(iter, gdb_dbgport_set) {
   65                 dp = *iter;
   66                 pri = (dp->gdb_probe != NULL) ? dp->gdb_probe() : -1;
   67                 dp->gdb_active = (pri >= 0) ? 0 : -1;
   68                 if (pri > cur_pri) {
   69                         cur_pri = pri;
   70                         gdb_cur = dp;
   71                 }
   72         }
   73         if (gdb_cur != NULL) {
   74                 printf("GDB: debug ports:");
   75                 SET_FOREACH(iter, gdb_dbgport_set) {
   76                         dp = *iter;
   77                         if (dp->gdb_active == 0)
   78                                 printf(" %s", dp->gdb_name);
   79                 }
   80                 printf("\n");
   81         } else
   82                 printf("GDB: no debug ports present\n");
   83         if (gdb_cur != NULL) {
   84                 gdb_cur->gdb_init();
   85                 printf("GDB: current port: %s\n", gdb_cur->gdb_name);
   86         }
   87         if (gdb_cur != NULL) {
   88                 cur_pri = (boothowto & RB_GDB) ? 2 : 0;
   89                 gdb_consinit();
   90         } else
   91                 cur_pri = -1;
   92         return (cur_pri);
   93 }
   94 
   95 static int
   96 gdb_trap(int type, int code)
   97 {
   98         jmp_buf jb;
   99         struct thread *thr_iter;
  100         void *prev_jb;
  101 
  102         prev_jb = kdb_jmpbuf(jb);
  103         if (setjmp(jb) != 0) {
  104                 printf("%s bailing, hopefully back to ddb!\n", __func__);
  105                 gdb_listening = 0;
  106                 (void)kdb_jmpbuf(prev_jb);
  107                 return (1);
  108         }
  109 
  110         gdb_listening = 0;
  111         /*
  112          * Send a T packet. We currently do not support watchpoints (the
  113          * awatch, rwatch or watch elements).
  114          */
  115         gdb_tx_begin('T');
  116         gdb_tx_hex(gdb_cpu_signal(type, code), 2);
  117         gdb_tx_varhex(GDB_REG_PC);
  118         gdb_tx_char(':');
  119         gdb_tx_reg(GDB_REG_PC);
  120         gdb_tx_char(';');
  121         gdb_tx_str("thread:");
  122         gdb_tx_varhex((long)kdb_thread->td_tid);
  123         gdb_tx_char(';');
  124         gdb_tx_end();                   /* XXX check error condition. */
  125 
  126         thr_iter = NULL;
  127         while (gdb_rx_begin() == 0) {
  128                 /* printf("GDB: got '%s'\n", gdb_rxp); */
  129                 switch (gdb_rx_char()) {
  130                 case '?':       /* Last signal. */
  131                         gdb_tx_begin('S');
  132                         gdb_tx_hex(gdb_cpu_signal(type, code), 2);
  133                         gdb_tx_end();
  134                         break;
  135                 case 'c': {     /* Continue. */
  136                         uintmax_t addr;
  137                         register_t pc;
  138                         if (!gdb_rx_varhex(&addr)) {
  139                                 pc = addr;
  140                                 gdb_cpu_setreg(GDB_REG_PC, &pc);
  141                         }
  142                         kdb_cpu_clear_singlestep();
  143                         gdb_listening = 1;
  144                         return (1);
  145                 }
  146                 case 'C': {     /* Continue with signal. */
  147                         uintmax_t addr, sig;
  148                         register_t pc;
  149                         if (!gdb_rx_varhex(&sig) && gdb_rx_char() == ';' &&
  150                             !gdb_rx_varhex(&addr)) {
  151                                 pc = addr;
  152                                 gdb_cpu_setreg(GDB_REG_PC, &pc);
  153                         }
  154                         kdb_cpu_clear_singlestep();
  155                         gdb_listening = 1;
  156                         return (1);
  157                 }
  158                 case 'D': {     /* Detach */
  159                         gdb_tx_ok();
  160                         kdb_cpu_clear_singlestep();
  161                         return (1);
  162                 }
  163                 case 'g': {     /* Read registers. */
  164                         size_t r;
  165                         gdb_tx_begin(0);
  166                         for (r = 0; r < GDB_NREGS; r++)
  167                                 gdb_tx_reg(r);
  168                         gdb_tx_end();
  169                         break;
  170                 }
  171                 case 'G':       /* Write registers. */
  172                         gdb_tx_err(0);
  173                         break;
  174                 case 'H': {     /* Set thread. */
  175                         intmax_t tid;
  176                         struct thread *thr;
  177                         gdb_rx_char();
  178                         if (gdb_rx_varhex(&tid)) {
  179                                 gdb_tx_err(EINVAL);
  180                                 break;
  181                         }
  182                         if (tid > 0) {
  183                                 thr = kdb_thr_lookup(tid);
  184                                 if (thr == NULL) {
  185                                         gdb_tx_err(ENOENT);
  186                                         break;
  187                                 }
  188                                 kdb_thr_select(thr);
  189                         }
  190                         gdb_tx_ok();
  191                         break;
  192                 }
  193                 case 'k':       /* Kill request. */
  194                         kdb_cpu_clear_singlestep();
  195                         gdb_listening = 1;
  196                         return (1);
  197                 case 'm': {     /* Read memory. */
  198                         uintmax_t addr, size;
  199                         if (gdb_rx_varhex(&addr) || gdb_rx_char() != ',' ||
  200                             gdb_rx_varhex(&size)) {
  201                                 gdb_tx_err(EINVAL);
  202                                 break;
  203                         }
  204                         gdb_tx_begin(0);
  205                         if (gdb_tx_mem((char *)(uintptr_t)addr, size))
  206                                 gdb_tx_end();
  207                         else
  208                                 gdb_tx_err(EIO);
  209                         break;
  210                 }
  211                 case 'M': {     /* Write memory. */
  212                         uintmax_t addr, size;
  213                         if (gdb_rx_varhex(&addr) || gdb_rx_char() != ',' ||
  214                             gdb_rx_varhex(&size) || gdb_rx_char() != ':') {
  215                                 gdb_tx_err(EINVAL);
  216                                 break;
  217                         }
  218                         if (gdb_rx_mem((char *)(uintptr_t)addr, size) == 0)
  219                                 gdb_tx_err(EIO);
  220                         else
  221                                 gdb_tx_ok();
  222                         break;
  223                 }
  224                 case 'P': {     /* Write register. */
  225                         char *val;
  226                         uintmax_t reg;
  227                         val = gdb_rxp;
  228                         if (gdb_rx_varhex(&reg) || gdb_rx_char() != '=' ||
  229                             !gdb_rx_mem(val, gdb_cpu_regsz(reg))) {
  230                                 gdb_tx_err(EINVAL);
  231                                 break;
  232                         }
  233                         gdb_cpu_setreg(reg, val);
  234                         gdb_tx_ok();
  235                         break;
  236                 }
  237                 case 'q':       /* General query. */
  238                         if (gdb_rx_equal("fThreadInfo")) {
  239                                 thr_iter = kdb_thr_first();
  240                                 gdb_tx_begin('m');
  241                                 gdb_tx_hex((long)thr_iter->td_tid, 8);
  242                                 gdb_tx_end();
  243                         } else if (gdb_rx_equal("sThreadInfo")) {
  244                                 if (thr_iter == NULL) {
  245                                         gdb_tx_err(ENXIO);
  246                                         break;
  247                                 }
  248                                 thr_iter = kdb_thr_next(thr_iter);
  249                                 if (thr_iter != NULL) {
  250                                         gdb_tx_begin('m');
  251                                         gdb_tx_hex((long)thr_iter->td_tid, 8);
  252                                         gdb_tx_end();
  253                                 } else {
  254                                         gdb_tx_begin('l');
  255                                         gdb_tx_end();
  256                                 }
  257                         } else if (!gdb_cpu_query())
  258                                 gdb_tx_empty();
  259                         break;
  260                 case 's': {     /* Step. */
  261                         uintmax_t addr;
  262                         register_t pc;
  263                         if (!gdb_rx_varhex(&addr)) {
  264                                 pc = addr;
  265                                 gdb_cpu_setreg(GDB_REG_PC, &pc);
  266                         }
  267                         kdb_cpu_set_singlestep();
  268                         gdb_listening = 1;
  269                         return (1);
  270                 }
  271                 case 'S': {     /* Step with signal. */
  272                         uintmax_t addr, sig;
  273                         register_t pc;
  274                         if (!gdb_rx_varhex(&sig) && gdb_rx_char() == ';' &&
  275                             !gdb_rx_varhex(&addr)) {
  276                                 pc = addr;
  277                                 gdb_cpu_setreg(GDB_REG_PC, &pc);
  278                         }
  279                         kdb_cpu_set_singlestep();
  280                         gdb_listening = 1;
  281                         return (1);
  282                 }
  283                 case 'T': {     /* Thread alive. */
  284                         intmax_t tid;
  285                         if (gdb_rx_varhex(&tid)) {
  286                                 gdb_tx_err(EINVAL);
  287                                 break;
  288                         }
  289                         if (kdb_thr_lookup(tid) != NULL)
  290                                 gdb_tx_ok();
  291                         else
  292                                 gdb_tx_err(ENOENT);
  293                         break;
  294                 }
  295                 case -1:
  296                         /* Empty command. Treat as unknown command. */
  297                         /* FALLTHROUGH */
  298                 default:
  299                         /* Unknown command. Send empty response. */
  300                         gdb_tx_empty();
  301                         break;
  302                 }
  303         }
  304         (void)kdb_jmpbuf(prev_jb);
  305         return (0);
  306 }

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