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/6.2/sys/ddb/db_main.c 163404 2006-10-16 09:00:30Z bde $");
   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 
   40 #include <machine/kdb.h>
   41 #include <machine/pcb.h>
   42 #include <machine/setjmp.h>
   43 
   44 #include <ddb/ddb.h>
   45 #include <ddb/db_command.h>
   46 #include <ddb/db_sym.h>
   47 
   48 static dbbe_init_f db_init;
   49 static dbbe_trap_f db_trap;
   50 
   51 KDB_BACKEND(ddb, db_init, db_trace_self, db_trap);
   52 
   53 vm_offset_t ksym_start, ksym_end;
   54 
   55 boolean_t
   56 X_db_line_at_pc(db_symtab_t *symtab, c_db_sym_t sym, char **file, int *line,
   57     db_expr_t off)
   58 {
   59         return (FALSE);
   60 }
   61 
   62 c_db_sym_t
   63 X_db_lookup(db_symtab_t *symtab, const char *symbol)
   64 {
   65         c_linker_sym_t lsym;
   66         Elf_Sym *sym;
   67 
   68         if (symtab->private == NULL) {
   69                 return ((c_db_sym_t)((!linker_ddb_lookup(symbol, &lsym))
   70                         ? lsym : NULL));
   71         } else {
   72                 sym = (Elf_Sym *)symtab->start;
   73                 while ((char *)sym < symtab->end) {
   74                         if (sym->st_name != 0 &&
   75                             !strcmp(symtab->private + sym->st_name, symbol))
   76                                 return ((c_db_sym_t)sym);
   77                         sym++;
   78                 }
   79         }
   80         return (NULL);
   81 }
   82 
   83 c_db_sym_t
   84 X_db_search_symbol(db_symtab_t *symtab, db_addr_t off, db_strategy_t strat,
   85     db_expr_t *diffp)
   86 {
   87         c_linker_sym_t lsym;
   88         Elf_Sym *sym, *match;
   89         unsigned long diff;
   90 
   91         if (symtab->private == NULL) {
   92                 if (!linker_ddb_search_symbol((caddr_t)off, &lsym, &diff)) {
   93                         *diffp = (db_expr_t)diff;
   94                         return ((c_db_sym_t)lsym);
   95                 }
   96                 return (NULL);
   97         }
   98 
   99         diff = ~0UL;
  100         match = NULL;
  101         for (sym = (Elf_Sym*)symtab->start; (char*)sym < symtab->end; sym++) {
  102                 if (sym->st_name == 0)
  103                         continue;
  104                 if (off < sym->st_value)
  105                         continue;
  106                 if (ELF_ST_TYPE(sym->st_info) != STT_OBJECT &&
  107                     ELF_ST_TYPE(sym->st_info) != STT_FUNC &&
  108                     ELF_ST_TYPE(sym->st_info) != STT_NOTYPE)
  109                         continue;
  110                 if ((off - sym->st_value) > diff)
  111                         continue;
  112                 if ((off - sym->st_value) < diff) {
  113                         diff = off - sym->st_value;
  114                         match = sym;
  115                 } else {
  116                         if (match == NULL)
  117                                 match = sym;
  118                         else if (ELF_ST_BIND(match->st_info) == STB_LOCAL &&
  119                             ELF_ST_BIND(sym->st_info) != STB_LOCAL)
  120                                 match = sym;
  121                 }
  122                 if (diff == 0) {
  123                         if (strat == DB_STGY_PROC &&
  124                             ELF_ST_TYPE(sym->st_info) == STT_FUNC &&
  125                             ELF_ST_BIND(sym->st_info) != STB_LOCAL)
  126                                 break;
  127                         if (strat == DB_STGY_ANY &&
  128                             ELF_ST_BIND(sym->st_info) != STB_LOCAL)
  129                                 break;
  130                 }
  131         }
  132 
  133         *diffp = (match == NULL) ? off : diff;
  134         return ((c_db_sym_t)match);
  135 }
  136 
  137 boolean_t
  138 X_db_sym_numargs(db_symtab_t *symtab, c_db_sym_t sym, int *nargp,
  139     char **argp)
  140 {
  141         return (FALSE);
  142 }
  143 
  144 void
  145 X_db_symbol_values(db_symtab_t *symtab, c_db_sym_t sym, const char **namep,
  146     db_expr_t *valp)
  147 {
  148         linker_symval_t lval;
  149 
  150         if (symtab->private == NULL) {
  151                 linker_ddb_symbol_values((c_linker_sym_t)sym, &lval);
  152                 if (namep != NULL)
  153                         *namep = (const char*)lval.name;
  154                 if (valp != NULL)
  155                         *valp = (db_expr_t)lval.value;
  156         } else {
  157                 if (namep != NULL)
  158                         *namep = (const char *)symtab->private +
  159                             ((const Elf_Sym *)sym)->st_name;
  160                 if (valp != NULL)
  161                         *valp = (db_expr_t)((const Elf_Sym *)sym)->st_value;
  162         }
  163 }
  164 
  165 static int
  166 db_init(void)
  167 {
  168         uintptr_t symtab, strtab;
  169         Elf_Size tabsz, strsz;
  170 
  171         if (ksym_end > ksym_start && ksym_start != 0) {
  172                 symtab = ksym_start;
  173                 tabsz = *((Elf_Size*)symtab);
  174                 symtab += sizeof(Elf_Size);
  175                 strtab = symtab + tabsz;
  176                 strsz = *((Elf_Size*)strtab);
  177                 strtab += sizeof(Elf_Size);
  178                 if (strtab + strsz <= ksym_end) {
  179                         db_add_symbol_table((char *)symtab,
  180                             (char *)(symtab + tabsz), "elf", (char *)strtab);
  181                 }
  182         }
  183         db_add_symbol_table(NULL, NULL, "kld", NULL);
  184         return (1);     /* We're the default debugger. */
  185 }
  186 
  187 static int
  188 db_trap(int type, int code)
  189 {
  190         jmp_buf jb;
  191         void *prev_jb;
  192         boolean_t bkpt, watchpt;
  193 
  194         /*
  195          * Don't handle the trap if the console is unavailable (i.e. it
  196          * is in graphics mode).
  197          */
  198         if (cnunavailable())
  199                 return (0);
  200 
  201         cndbctl(TRUE);
  202         bkpt = IS_BREAKPOINT_TRAP(type, code);
  203         watchpt = IS_WATCHPOINT_TRAP(type, code);
  204 
  205         if (db_stop_at_pc(&bkpt)) {
  206                 if (db_inst_count) {
  207                         db_printf("After %d instructions (%d loads, %d stores),\n",
  208                             db_inst_count, db_load_count, db_store_count);
  209                 }
  210                 prev_jb = kdb_jmpbuf(jb);
  211                 if (setjmp(jb) == 0) {
  212                         db_dot = PC_REGS();
  213                         db_print_thread();
  214                         if (bkpt)
  215                                 db_printf("Breakpoint at\t");
  216                         else if (watchpt)
  217                                 db_printf("Watchpoint at\t");
  218                         else
  219                                 db_printf("Stopped at\t");
  220                         db_print_loc_and_inst(db_dot);
  221                 }
  222                 db_command_loop();
  223                 (void)kdb_jmpbuf(prev_jb);
  224         }
  225 
  226         db_restart_at_pc(watchpt);
  227 
  228         cndbctl(FALSE);
  229         return (1);
  230 }

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

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