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/11.0/sys/gdb/gdb_main.c 271173 2014-09-05 16:40:47Z benno $");
   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 unsigned char gdb_bindata[64];
   57 
   58 static int
   59 gdb_init(void)
   60 {
   61         struct gdb_dbgport *dp, **iter;
   62         int cur_pri, pri;
   63 
   64         gdb_cur = NULL;
   65         cur_pri = -1;
   66         SET_FOREACH(iter, gdb_dbgport_set) {
   67                 dp = *iter;
   68                 pri = (dp->gdb_probe != NULL) ? dp->gdb_probe() : -1;
   69                 dp->gdb_active = (pri >= 0) ? 0 : -1;
   70                 if (pri > cur_pri) {
   71                         cur_pri = pri;
   72                         gdb_cur = dp;
   73                 }
   74         }
   75         if (gdb_cur != NULL) {
   76                 printf("GDB: debug ports:");
   77                 SET_FOREACH(iter, gdb_dbgport_set) {
   78                         dp = *iter;
   79                         if (dp->gdb_active == 0)
   80                                 printf(" %s", dp->gdb_name);
   81                 }
   82                 printf("\n");
   83         } else
   84                 printf("GDB: no debug ports present\n");
   85         if (gdb_cur != NULL) {
   86                 gdb_cur->gdb_init();
   87                 printf("GDB: current port: %s\n", gdb_cur->gdb_name);
   88         }
   89         if (gdb_cur != NULL) {
   90                 cur_pri = (boothowto & RB_GDB) ? 2 : 0;
   91                 gdb_consinit();
   92         } else
   93                 cur_pri = -1;
   94         return (cur_pri);
   95 }
   96 
   97 static int
   98 gdb_trap(int type, int code)
   99 {
  100         jmp_buf jb;
  101         struct thread *thr_iter;
  102         void *prev_jb;
  103 
  104         prev_jb = kdb_jmpbuf(jb);
  105         if (setjmp(jb) != 0) {
  106                 printf("%s bailing, hopefully back to ddb!\n", __func__);
  107                 gdb_listening = 0;
  108                 (void)kdb_jmpbuf(prev_jb);
  109                 return (1);
  110         }
  111 
  112         gdb_listening = 0;
  113         /*
  114          * Send a T packet. We currently do not support watchpoints (the
  115          * awatch, rwatch or watch elements).
  116          */
  117         gdb_tx_begin('T');
  118         gdb_tx_hex(gdb_cpu_signal(type, code), 2);
  119         gdb_tx_varhex(GDB_REG_PC);
  120         gdb_tx_char(':');
  121         gdb_tx_reg(GDB_REG_PC);
  122         gdb_tx_char(';');
  123         gdb_tx_str("thread:");
  124         gdb_tx_varhex((long)kdb_thread->td_tid);
  125         gdb_tx_char(';');
  126         gdb_tx_end();                   /* XXX check error condition. */
  127 
  128         thr_iter = NULL;
  129         while (gdb_rx_begin() == 0) {
  130                 /* printf("GDB: got '%s'\n", gdb_rxp); */
  131                 switch (gdb_rx_char()) {
  132                 case '?':       /* Last signal. */
  133                         gdb_tx_begin('S');
  134                         gdb_tx_hex(gdb_cpu_signal(type, code), 2);
  135                         gdb_tx_end();
  136                         break;
  137                 case 'c': {     /* Continue. */
  138                         uintmax_t addr;
  139                         register_t pc;
  140                         if (!gdb_rx_varhex(&addr)) {
  141                                 pc = addr;
  142                                 gdb_cpu_setreg(GDB_REG_PC, &pc);
  143                         }
  144                         kdb_cpu_clear_singlestep();
  145                         gdb_listening = 1;
  146                         return (1);
  147                 }
  148                 case 'C': {     /* Continue with signal. */
  149                         uintmax_t addr, sig;
  150                         register_t pc;
  151                         if (!gdb_rx_varhex(&sig) && gdb_rx_char() == ';' &&
  152                             !gdb_rx_varhex(&addr)) {
  153                                 pc = addr;
  154                                 gdb_cpu_setreg(GDB_REG_PC, &pc);
  155                         }
  156                         kdb_cpu_clear_singlestep();
  157                         gdb_listening = 1;
  158                         return (1);
  159                 }
  160                 case 'D': {     /* Detach */
  161                         gdb_tx_ok();
  162                         kdb_cpu_clear_singlestep();
  163                         return (1);
  164                 }
  165                 case 'g': {     /* Read registers. */
  166                         size_t r;
  167                         gdb_tx_begin(0);
  168                         for (r = 0; r < GDB_NREGS; r++)
  169                                 gdb_tx_reg(r);
  170                         gdb_tx_end();
  171                         break;
  172                 }
  173                 case 'G':       /* Write registers. */
  174                         gdb_tx_err(0);
  175                         break;
  176                 case 'H': {     /* Set thread. */
  177                         intmax_t tid;
  178                         struct thread *thr;
  179                         gdb_rx_char();
  180                         if (gdb_rx_varhex(&tid)) {
  181                                 gdb_tx_err(EINVAL);
  182                                 break;
  183                         }
  184                         if (tid > 0) {
  185                                 thr = kdb_thr_lookup(tid);
  186                                 if (thr == NULL) {
  187                                         gdb_tx_err(ENOENT);
  188                                         break;
  189                                 }
  190                                 kdb_thr_select(thr);
  191                         }
  192                         gdb_tx_ok();
  193                         break;
  194                 }
  195                 case 'k':       /* Kill request. */
  196                         kdb_cpu_clear_singlestep();
  197                         gdb_listening = 1;
  198                         return (1);
  199                 case 'm': {     /* Read memory. */
  200                         uintmax_t addr, size;
  201                         if (gdb_rx_varhex(&addr) || gdb_rx_char() != ',' ||
  202                             gdb_rx_varhex(&size)) {
  203                                 gdb_tx_err(EINVAL);
  204                                 break;
  205                         }
  206                         gdb_tx_begin(0);
  207                         if (gdb_tx_mem((char *)(uintptr_t)addr, size))
  208                                 gdb_tx_end();
  209                         else
  210                                 gdb_tx_err(EIO);
  211                         break;
  212                 }
  213                 case 'M': {     /* Write memory. */
  214                         uintmax_t addr, size;
  215                         if (gdb_rx_varhex(&addr) || gdb_rx_char() != ',' ||
  216                             gdb_rx_varhex(&size) || gdb_rx_char() != ':') {
  217                                 gdb_tx_err(EINVAL);
  218                                 break;
  219                         }
  220                         if (gdb_rx_mem((char *)(uintptr_t)addr, size) == 0)
  221                                 gdb_tx_err(EIO);
  222                         else
  223                                 gdb_tx_ok();
  224                         break;
  225                 }
  226                 case 'P': {     /* Write register. */
  227                         char *val;
  228                         uintmax_t reg;
  229                         val = gdb_rxp;
  230                         if (gdb_rx_varhex(&reg) || gdb_rx_char() != '=' ||
  231                             !gdb_rx_mem(val, gdb_cpu_regsz(reg))) {
  232                                 gdb_tx_err(EINVAL);
  233                                 break;
  234                         }
  235                         gdb_cpu_setreg(reg, val);
  236                         gdb_tx_ok();
  237                         break;
  238                 }
  239                 case 'q':       /* General query. */
  240                         if (gdb_rx_equal("fThreadInfo")) {
  241                                 thr_iter = kdb_thr_first();
  242                                 gdb_tx_begin('m');
  243                                 gdb_tx_hex((long)thr_iter->td_tid, 8);
  244                                 gdb_tx_end();
  245                         } else if (gdb_rx_equal("sThreadInfo")) {
  246                                 if (thr_iter == NULL) {
  247                                         gdb_tx_err(ENXIO);
  248                                         break;
  249                                 }
  250                                 thr_iter = kdb_thr_next(thr_iter);
  251                                 if (thr_iter != NULL) {
  252                                         gdb_tx_begin('m');
  253                                         gdb_tx_hex((long)thr_iter->td_tid, 8);
  254                                         gdb_tx_end();
  255                                 } else {
  256                                         gdb_tx_begin('l');
  257                                         gdb_tx_end();
  258                                 }
  259                         } else if (gdb_rx_equal("Search:memory:")) {
  260                                 size_t patlen;
  261                                 intmax_t addr, size;
  262                                 const unsigned char *found;
  263                                 if (gdb_rx_varhex(&addr) || gdb_rx_char() != ';' ||
  264                                     gdb_rx_varhex(&size) || gdb_rx_char() != ';' ||
  265                                     gdb_rx_bindata(gdb_bindata, sizeof(gdb_bindata), &patlen)) {
  266                                         gdb_tx_err(EINVAL);
  267                                         break;
  268                                 }
  269                                 if (gdb_search_mem((char *)(uintptr_t)addr, size, gdb_bindata, patlen, &found)) {
  270                                         if (found == 0ULL)
  271                                                 gdb_tx_begin('');
  272                                         else {
  273                                                 gdb_tx_begin('1');
  274                                                 gdb_tx_char(',');
  275                                                 gdb_tx_hex((intmax_t)(uintptr_t)found, 8);
  276                                         }
  277                                         gdb_tx_end();
  278                                 } else
  279                                         gdb_tx_err(EIO);
  280                                 break;
  281                         } else if (!gdb_cpu_query())
  282                                 gdb_tx_empty();
  283                         break;
  284                 case 's': {     /* Step. */
  285                         uintmax_t addr;
  286                         register_t pc;
  287                         if (!gdb_rx_varhex(&addr)) {
  288                                 pc = addr;
  289                                 gdb_cpu_setreg(GDB_REG_PC, &pc);
  290                         }
  291                         kdb_cpu_set_singlestep();
  292                         gdb_listening = 1;
  293                         return (1);
  294                 }
  295                 case 'S': {     /* Step with signal. */
  296                         uintmax_t addr, sig;
  297                         register_t pc;
  298                         if (!gdb_rx_varhex(&sig) && gdb_rx_char() == ';' &&
  299                             !gdb_rx_varhex(&addr)) {
  300                                 pc = addr;
  301                                 gdb_cpu_setreg(GDB_REG_PC, &pc);
  302                         }
  303                         kdb_cpu_set_singlestep();
  304                         gdb_listening = 1;
  305                         return (1);
  306                 }
  307                 case 'T': {     /* Thread alive. */
  308                         intmax_t tid;
  309                         if (gdb_rx_varhex(&tid)) {
  310                                 gdb_tx_err(EINVAL);
  311                                 break;
  312                         }
  313                         if (kdb_thr_lookup(tid) != NULL)
  314                                 gdb_tx_ok();
  315                         else
  316                                 gdb_tx_err(ENOENT);
  317                         break;
  318                 }
  319                 case -1:
  320                         /* Empty command. Treat as unknown command. */
  321                         /* FALLTHROUGH */
  322                 default:
  323                         /* Unknown command. Send empty response. */
  324                         gdb_tx_empty();
  325                         break;
  326                 }
  327         }
  328         (void)kdb_jmpbuf(prev_jb);
  329         return (0);
  330 }

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