db_main.c

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    1 /*-
    2  * Mach Operating System
    3  * Copyright (c) 1991,1990 Carnegie Mellon University
    4  * All Rights Reserved.
    5  *
    6  * Permission to use, copy, modify and distribute this software and its
    7  * documentation is hereby granted, provided that both the copyright
    8  * notice and this permission notice appear in all copies of the
    9  * software, derivative works or modified versions, and any portions
   10  * thereof, and that both notices appear in supporting documentation.
   11  *
   12  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
   13  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
   14  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   15  *
   16  * Carnegie Mellon requests users of this software to return to
   17  *
   18  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   19  *  School of Computer Science
   20  *  Carnegie Mellon University
   21  *  Pittsburgh PA 15213-3890
   22  *
   23  * any improvements or extensions that they make and grant Carnegie the
   24  * rights to redistribute these changes.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/8.1/sys/ddb/db_main.c 199583 2009-11-20 15:27:52Z jhb $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/cons.h>
   33 #include <sys/linker.h>
   34 #include <sys/kdb.h>
   35 #include <sys/kernel.h>
   36 #include <sys/pcpu.h>
   37 #include <sys/proc.h>
   38 #include <sys/reboot.h>
   39 #include <sys/sysctl.h>
   40 
   41 #include <machine/kdb.h>
   42 #include <machine/pcb.h>
   43 #include <machine/setjmp.h>
   44 
   45 #include <ddb/ddb.h>
   46 #include <ddb/db_command.h>
   47 #include <ddb/db_sym.h>
   48 
   49 SYSCTL_NODE(_debug, OID_AUTO, ddb, CTLFLAG_RW, 0, "DDB settings");
   50 
   51 static dbbe_init_f db_init;
   52 static dbbe_trap_f db_trap;
   53 static dbbe_trace_f db_trace_self_wrapper;
   54 
   55 KDB_BACKEND(ddb, db_init, db_trace_self_wrapper, db_trap);
   56 
   57 vm_offset_t ksym_start, ksym_end;
   58 
   59 boolean_t
   60 X_db_line_at_pc(db_symtab_t *symtab, c_db_sym_t sym, char **file, int *line,
   61     db_expr_t off)
   62 {
   63         return (FALSE);
   64 }
   65 
   66 c_db_sym_t
   67 X_db_lookup(db_symtab_t *symtab, const char *symbol)
   68 {
   69         c_linker_sym_t lsym;
   70         Elf_Sym *sym;
   71 
   72         if (symtab->private == NULL) {
   73                 return ((c_db_sym_t)((!linker_ddb_lookup(symbol, &lsym))
   74                         ? lsym : NULL));
   75         } else {
   76                 sym = (Elf_Sym *)symtab->start;
   77                 while ((char *)sym < symtab->end) {
   78                         if (sym->st_name != 0 &&
   79                             !strcmp(symtab->private + sym->st_name, symbol))
   80                                 return ((c_db_sym_t)sym);
   81                         sym++;
   82                 }
   83         }
   84         return (NULL);
   85 }
   86 
   87 c_db_sym_t
   88 X_db_search_symbol(db_symtab_t *symtab, db_addr_t off, db_strategy_t strat,
   89     db_expr_t *diffp)
   90 {
   91         c_linker_sym_t lsym;
   92         Elf_Sym *sym, *match;
   93         unsigned long diff;
   94 
   95         if (symtab->private == NULL) {
   96                 if (!linker_ddb_search_symbol((caddr_t)off, &lsym, &diff)) {
   97                         *diffp = (db_expr_t)diff;
   98                         return ((c_db_sym_t)lsym);
   99                 }
  100                 return (NULL);
  101         }
  102 
  103         diff = ~0UL;
  104         match = NULL;
  105         for (sym = (Elf_Sym*)symtab->start; (char*)sym < symtab->end; sym++) {
  106                 if (sym->st_name == 0)
  107                         continue;
  108                 if (off < sym->st_value)
  109                         continue;
  110                 if (ELF_ST_TYPE(sym->st_info) != STT_OBJECT &&
  111                     ELF_ST_TYPE(sym->st_info) != STT_FUNC &&
  112                     ELF_ST_TYPE(sym->st_info) != STT_NOTYPE)
  113                         continue;
  114                 if ((off - sym->st_value) > diff)
  115                         continue;
  116                 if ((off - sym->st_value) < diff) {
  117                         diff = off - sym->st_value;
  118                         match = sym;
  119                 } else {
  120                         if (match == NULL)
  121                                 match = sym;
  122                         else if (ELF_ST_BIND(match->st_info) == STB_LOCAL &&
  123                             ELF_ST_BIND(sym->st_info) != STB_LOCAL)
  124                                 match = sym;
  125                 }
  126                 if (diff == 0) {
  127                         if (strat == DB_STGY_PROC &&
  128                             ELF_ST_TYPE(sym->st_info) == STT_FUNC &&
  129                             ELF_ST_BIND(sym->st_info) != STB_LOCAL)
  130                                 break;
  131                         if (strat == DB_STGY_ANY &&
  132                             ELF_ST_BIND(sym->st_info) != STB_LOCAL)
  133                                 break;
  134                 }
  135         }
  136 
  137         *diffp = (match == NULL) ? off : diff;
  138         return ((c_db_sym_t)match);
  139 }
  140 
  141 boolean_t
  142 X_db_sym_numargs(db_symtab_t *symtab, c_db_sym_t sym, int *nargp,
  143     char **argp)
  144 {
  145         return (FALSE);
  146 }
  147 
  148 void
  149 X_db_symbol_values(db_symtab_t *symtab, c_db_sym_t sym, const char **namep,
  150     db_expr_t *valp)
  151 {
  152         linker_symval_t lval;
  153 
  154         if (symtab->private == NULL) {
  155                 linker_ddb_symbol_values((c_linker_sym_t)sym, &lval);
  156                 if (namep != NULL)
  157                         *namep = (const char*)lval.name;
  158                 if (valp != NULL)
  159                         *valp = (db_expr_t)lval.value;
  160         } else {
  161                 if (namep != NULL)
  162                         *namep = (const char *)symtab->private +
  163                             ((const Elf_Sym *)sym)->st_name;
  164                 if (valp != NULL)
  165                         *valp = (db_expr_t)((const Elf_Sym *)sym)->st_value;
  166         }
  167 }
  168 
  169 static int
  170 db_init(void)
  171 {
  172         uintptr_t symtab, strtab;
  173         Elf_Size tabsz, strsz;
  174 
  175         db_command_init();
  176         if (ksym_end > ksym_start && ksym_start != 0) {
  177                 symtab = ksym_start;
  178                 tabsz = *((Elf_Size*)symtab);
  179                 symtab += sizeof(Elf_Size);
  180                 strtab = symtab + tabsz;
  181                 strsz = *((Elf_Size*)strtab);
  182                 strtab += sizeof(Elf_Size);
  183                 if (strtab + strsz <= ksym_end) {
  184                         db_add_symbol_table((char *)symtab,
  185                             (char *)(symtab + tabsz), "elf", (char *)strtab);
  186                 }
  187         }
  188         db_add_symbol_table(NULL, NULL, "kld", NULL);
  189         return (1);     /* We're the default debugger. */
  190 }
  191 
  192 static int
  193 db_trap(int type, int code)
  194 {
  195         jmp_buf jb;
  196         void *prev_jb;
  197         boolean_t bkpt, watchpt;
  198         const char *why;
  199 
  200         /*
  201          * Don't handle the trap if the console is unavailable (i.e. it
  202          * is in graphics mode).
  203          */
  204         if (cnunavailable())
  205                 return (0);
  206 
  207         bkpt = IS_BREAKPOINT_TRAP(type, code);
  208         watchpt = IS_WATCHPOINT_TRAP(type, code);
  209 
  210         if (db_stop_at_pc(&bkpt)) {
  211                 if (db_inst_count) {
  212                         db_printf("After %d instructions (%d loads, %d stores),\n",
  213                             db_inst_count, db_load_count, db_store_count);
  214                 }
  215                 prev_jb = kdb_jmpbuf(jb);
  216                 if (setjmp(jb) == 0) {
  217                         db_dot = PC_REGS();
  218                         db_print_thread();
  219                         if (bkpt)
  220                                 db_printf("Breakpoint at\t");
  221                         else if (watchpt)
  222                                 db_printf("Watchpoint at\t");
  223                         else
  224                                 db_printf("Stopped at\t");
  225                         db_print_loc_and_inst(db_dot);
  226                 }
  227                 why = kdb_why;
  228                 db_script_kdbenter(why != KDB_WHY_UNSET ? why : "unknown");
  229                 db_command_loop();
  230                 (void)kdb_jmpbuf(prev_jb);
  231         }
  232 
  233         db_restart_at_pc(watchpt);
  234 
  235         return (1);
  236 }
  237 
  238 static void
  239 db_trace_self_wrapper(void)
  240 {
  241         jmp_buf jb;
  242         void *prev_jb;
  243 
  244         prev_jb = kdb_jmpbuf(jb);
  245         if (setjmp(jb) == 0)
  246                 db_trace_self();
  247         (void)kdb_jmpbuf(prev_jb);
  248 }

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FreeBSD/Linux Kernel Cross Reference sys/ddb/db_main.c

FreeBSD/Linux Kernel Cross Reference
sys/ddb/db_main.c