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/6.1/sys/gdb/gdb_main.c 144245 2005-03-28 18:31:18Z sam $");
   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, gdb_trap);
   48 
   49 GDB_DBGPORT(null, NULL, NULL, NULL, NULL, NULL, NULL);
   50 SET_DECLARE(gdb_dbgport_set, struct gdb_dbgport);
   51 
   52 struct gdb_dbgport *gdb_cur = NULL;
   53 
   54 static int
   55 gdb_init(void)
   56 {
   57         struct gdb_dbgport *dp, **iter;
   58         int cur_pri, pri;
   59 
   60         gdb_cur = NULL;
   61         cur_pri = -1;
   62         SET_FOREACH(iter, gdb_dbgport_set) {
   63                 dp = *iter;
   64                 pri = (dp->gdb_probe != NULL) ? dp->gdb_probe() : -1;
   65                 dp->gdb_active = (pri >= 0) ? 0 : -1;
   66                 if (pri > cur_pri) {
   67                         cur_pri = pri;
   68                         gdb_cur = dp;
   69                 }
   70         }
   71         if (gdb_cur != NULL) {
   72                 printf("GDB: debug ports:");
   73                 SET_FOREACH(iter, gdb_dbgport_set) {
   74                         dp = *iter;
   75                         if (dp->gdb_active == 0)
   76                                 printf(" %s", dp->gdb_name);
   77                 }
   78                 printf("\n");
   79         } else
   80                 printf("GDB: no debug ports present\n");
   81         if (gdb_cur != NULL) {
   82                 gdb_cur->gdb_init();
   83                 printf("GDB: current port: %s\n", gdb_cur->gdb_name);
   84         }
   85         if (gdb_cur != NULL)
   86                 cur_pri = (boothowto & RB_GDB) ? 2 : 0;
   87         else
   88                 cur_pri = -1;
   89         return (cur_pri);
   90 }
   91 
   92 static int
   93 gdb_trap(int type, int code)
   94 {
   95         struct thread *thr_iter;
   96 
   97         /*
   98          * Send a T packet. We currently do not support watchpoints (the
   99          * awatch, rwatch or watch elements).
  100          */
  101         gdb_tx_begin('T');
  102         gdb_tx_hex(gdb_cpu_signal(type, code), 2);
  103         gdb_tx_varhex(GDB_REG_PC);
  104         gdb_tx_char(':');
  105         gdb_tx_reg(GDB_REG_PC);
  106         gdb_tx_char(';');
  107         gdb_tx_str("thread:");
  108         gdb_tx_varhex((long)kdb_thread->td_tid);
  109         gdb_tx_char(';');
  110         gdb_tx_end();                   /* XXX check error condition. */
  111 
  112         thr_iter = NULL;
  113         while (gdb_rx_begin() == 0) {
  114                 /* printf("GDB: got '%s'\n", gdb_rxp); */
  115                 switch (gdb_rx_char()) {
  116                 case '?':       /* Last signal. */
  117                         gdb_tx_begin('S');
  118                         gdb_tx_hex(gdb_cpu_signal(type, code), 2);
  119                         gdb_tx_end();
  120                         break;
  121                 case 'c': {     /* Continue. */
  122                         uintmax_t addr;
  123                         register_t pc;
  124                         if (!gdb_rx_varhex(&addr)) {
  125                                 pc = addr;
  126                                 gdb_cpu_setreg(GDB_REG_PC, &pc);
  127                         }
  128                         kdb_cpu_clear_singlestep();
  129                         return (1);
  130                 }
  131                 case 'C': {     /* Continue with signal. */
  132                         uintmax_t addr, sig;
  133                         register_t pc;
  134                         if (!gdb_rx_varhex(&sig) && gdb_rx_char() == ';' &&
  135                             !gdb_rx_varhex(&addr)) {
  136                                 pc = addr;
  137                                 gdb_cpu_setreg(GDB_REG_PC, &pc);
  138                         }
  139                         kdb_cpu_clear_singlestep();
  140                         return (1);
  141                 }
  142                 case 'g': {     /* Read registers. */
  143                         size_t r;
  144                         gdb_tx_begin(0);
  145                         for (r = 0; r < GDB_NREGS; r++)
  146                                 gdb_tx_reg(r);
  147                         gdb_tx_end();
  148                         break;
  149                 }
  150                 case 'G':       /* Write registers. */
  151                         gdb_tx_err(0);
  152                         break;
  153                 case 'H': {     /* Set thread. */
  154                         intmax_t tid;
  155                         struct thread *thr;
  156                         gdb_rx_char();
  157                         if (gdb_rx_varhex(&tid)) {
  158                                 gdb_tx_err(EINVAL);
  159                                 break;
  160                         }
  161                         if (tid > 0) {
  162                                 thr = kdb_thr_lookup(tid);
  163                                 if (thr == NULL) {
  164                                         gdb_tx_err(ENOENT);
  165                                         break;
  166                                 }
  167                                 kdb_thr_select(thr);
  168                         }
  169                         gdb_tx_ok();
  170                         break;
  171                 }
  172                 case 'k':       /* Kill request. */
  173                         kdb_cpu_clear_singlestep();
  174                         return (1);
  175                 case 'm': {     /* Read memory. */
  176                         uintmax_t addr, size;
  177                         if (gdb_rx_varhex(&addr) || gdb_rx_char() != ',' ||
  178                             gdb_rx_varhex(&size)) {
  179                                 gdb_tx_err(EINVAL);
  180                                 break;
  181                         }
  182                         gdb_tx_begin(0);
  183                         if (gdb_tx_mem((char *)(uintptr_t)addr, size))
  184                                 gdb_tx_end();
  185                         else
  186                                 gdb_tx_err(EIO);
  187                         break;
  188                 }
  189                 case 'M': {     /* Write memory. */
  190                         uintmax_t addr, size;
  191                         if (gdb_rx_varhex(&addr) || gdb_rx_char() != ',' ||
  192                             gdb_rx_varhex(&size) || gdb_rx_char() != ':') {
  193                                 gdb_tx_err(EINVAL);
  194                                 break;
  195                         }
  196                         if (gdb_rx_mem((char *)(uintptr_t)addr, size) == 0)
  197                                 gdb_tx_err(EIO);
  198                         else
  199                                 gdb_tx_ok();
  200                         break;
  201                 }
  202                 case 'P': {     /* Write register. */
  203                         char *val;
  204                         uintmax_t reg;
  205                         val = gdb_rxp;
  206                         if (gdb_rx_varhex(&reg) || gdb_rx_char() != '=' ||
  207                             !gdb_rx_mem(val, gdb_cpu_regsz(reg))) {
  208                                 gdb_tx_err(EINVAL);
  209                                 break;
  210                         }
  211                         gdb_cpu_setreg(reg, val);
  212                         gdb_tx_ok();
  213                         break;
  214                 }
  215                 case 'q':       /* General query. */
  216                         if (gdb_rx_equal("fThreadInfo")) {
  217                                 thr_iter = kdb_thr_first();
  218                                 gdb_tx_begin('m');
  219                                 gdb_tx_hex((long)thr_iter->td_tid, 8);
  220                                 gdb_tx_end();
  221                         } else if (gdb_rx_equal("sThreadInfo")) {
  222                                 if (thr_iter == NULL) {
  223                                         gdb_tx_err(ENXIO);
  224                                         break;
  225                                 }
  226                                 thr_iter = kdb_thr_next(thr_iter);
  227                                 if (thr_iter != NULL) {
  228                                         gdb_tx_begin('m');
  229                                         gdb_tx_hex((long)thr_iter->td_tid, 8);
  230                                         gdb_tx_end();
  231                                 } else {
  232                                         gdb_tx_begin('l');
  233                                         gdb_tx_end();
  234                                 }
  235                         } else if (!gdb_cpu_query())
  236                                 gdb_tx_empty();
  237                         break;
  238                 case 's': {     /* Step. */
  239                         uintmax_t addr;
  240                         register_t pc;
  241                         if (!gdb_rx_varhex(&addr)) {
  242                                 pc = addr;
  243                                 gdb_cpu_setreg(GDB_REG_PC, &pc);
  244                         }
  245                         kdb_cpu_set_singlestep();
  246                         return (1);
  247                 }
  248                 case 'S': {     /* Step with signal. */
  249                         uintmax_t addr, sig;
  250                         register_t pc;
  251                         if (!gdb_rx_varhex(&sig) && gdb_rx_char() == ';' &&
  252                             !gdb_rx_varhex(&addr)) {
  253                                 pc = addr;
  254                                 gdb_cpu_setreg(GDB_REG_PC, &pc);
  255                         }
  256                         kdb_cpu_set_singlestep();
  257                         return (1);
  258                 }
  259                 case 'T': {     /* Thread alive. */
  260                         intmax_t tid;
  261                         if (gdb_rx_varhex(&tid)) {
  262                                 gdb_tx_err(EINVAL);
  263                                 break;
  264                         }
  265                         if (kdb_thr_lookup(tid) != NULL)
  266                                 gdb_tx_ok();
  267                         else
  268                                 gdb_tx_err(ENOENT);
  269                         break;
  270                 }
  271                 case -1:
  272                         /* Empty command. Treat as unknown command. */
  273                         /* FALLTHROUGH */
  274                 default:
  275                         /* Unknown command. Send empty response. */
  276                         gdb_tx_empty();
  277                         break;
  278                 }
  279         }
  280         return (0);
  281 }

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