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/8.4/sys/ddb/db_main.c 235742 2012-05-21 21:16:08Z 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 static dbbe_trace_thread_f db_trace_thread_wrapper;
   55 
   56 KDB_BACKEND(ddb, db_init, db_trace_self_wrapper, db_trace_thread_wrapper,
   57     db_trap);
   58 
   59 vm_offset_t ksym_start, ksym_end;
   60 
   61 boolean_t
   62 X_db_line_at_pc(db_symtab_t *symtab, c_db_sym_t sym, char **file, int *line,
   63     db_expr_t off)
   64 {
   65         return (FALSE);
   66 }
   67 
   68 c_db_sym_t
   69 X_db_lookup(db_symtab_t *symtab, const char *symbol)
   70 {
   71         c_linker_sym_t lsym;
   72         Elf_Sym *sym;
   73 
   74         if (symtab->private == NULL) {
   75                 return ((c_db_sym_t)((!linker_ddb_lookup(symbol, &lsym))
   76                         ? lsym : NULL));
   77         } else {
   78                 sym = (Elf_Sym *)symtab->start;
   79                 while ((char *)sym < symtab->end) {
   80                         if (sym->st_name != 0 &&
   81                             !strcmp(symtab->private + sym->st_name, symbol))
   82                                 return ((c_db_sym_t)sym);
   83                         sym++;
   84                 }
   85         }
   86         return (NULL);
   87 }
   88 
   89 c_db_sym_t
   90 X_db_search_symbol(db_symtab_t *symtab, db_addr_t off, db_strategy_t strat,
   91     db_expr_t *diffp)
   92 {
   93         c_linker_sym_t lsym;
   94         Elf_Sym *sym, *match;
   95         unsigned long diff;
   96 
   97         if (symtab->private == NULL) {
   98                 if (!linker_ddb_search_symbol((caddr_t)off, &lsym, &diff)) {
   99                         *diffp = (db_expr_t)diff;
  100                         return ((c_db_sym_t)lsym);
  101                 }
  102                 return (NULL);
  103         }
  104 
  105         diff = ~0UL;
  106         match = NULL;
  107         for (sym = (Elf_Sym*)symtab->start; (char*)sym < symtab->end; sym++) {
  108                 if (sym->st_name == 0)
  109                         continue;
  110                 if (off < sym->st_value)
  111                         continue;
  112                 if (ELF_ST_TYPE(sym->st_info) != STT_OBJECT &&
  113                     ELF_ST_TYPE(sym->st_info) != STT_FUNC &&
  114                     ELF_ST_TYPE(sym->st_info) != STT_NOTYPE)
  115                         continue;
  116                 if ((off - sym->st_value) > diff)
  117                         continue;
  118                 if ((off - sym->st_value) < diff) {
  119                         diff = off - sym->st_value;
  120                         match = sym;
  121                 } else {
  122                         if (match == NULL)
  123                                 match = sym;
  124                         else if (ELF_ST_BIND(match->st_info) == STB_LOCAL &&
  125                             ELF_ST_BIND(sym->st_info) != STB_LOCAL)
  126                                 match = sym;
  127                 }
  128                 if (diff == 0) {
  129                         if (strat == DB_STGY_PROC &&
  130                             ELF_ST_TYPE(sym->st_info) == STT_FUNC &&
  131                             ELF_ST_BIND(sym->st_info) != STB_LOCAL)
  132                                 break;
  133                         if (strat == DB_STGY_ANY &&
  134                             ELF_ST_BIND(sym->st_info) != STB_LOCAL)
  135                                 break;
  136                 }
  137         }
  138 
  139         *diffp = (match == NULL) ? off : diff;
  140         return ((c_db_sym_t)match);
  141 }
  142 
  143 boolean_t
  144 X_db_sym_numargs(db_symtab_t *symtab, c_db_sym_t sym, int *nargp,
  145     char **argp)
  146 {
  147         return (FALSE);
  148 }
  149 
  150 void
  151 X_db_symbol_values(db_symtab_t *symtab, c_db_sym_t sym, const char **namep,
  152     db_expr_t *valp)
  153 {
  154         linker_symval_t lval;
  155 
  156         if (symtab->private == NULL) {
  157                 linker_ddb_symbol_values((c_linker_sym_t)sym, &lval);
  158                 if (namep != NULL)
  159                         *namep = (const char*)lval.name;
  160                 if (valp != NULL)
  161                         *valp = (db_expr_t)lval.value;
  162         } else {
  163                 if (namep != NULL)
  164                         *namep = (const char *)symtab->private +
  165                             ((const Elf_Sym *)sym)->st_name;
  166                 if (valp != NULL)
  167                         *valp = (db_expr_t)((const Elf_Sym *)sym)->st_value;
  168         }
  169 }
  170 
  171 static int
  172 db_init(void)
  173 {
  174         uintptr_t symtab, strtab;
  175         Elf_Size tabsz, strsz;
  176 
  177         db_command_init();
  178         if (ksym_end > ksym_start && ksym_start != 0) {
  179                 symtab = ksym_start;
  180                 tabsz = *((Elf_Size*)symtab);
  181                 symtab += sizeof(Elf_Size);
  182                 strtab = symtab + tabsz;
  183                 strsz = *((Elf_Size*)strtab);
  184                 strtab += sizeof(Elf_Size);
  185                 if (strtab + strsz <= ksym_end) {
  186                         db_add_symbol_table((char *)symtab,
  187                             (char *)(symtab + tabsz), "elf", (char *)strtab);
  188                 }
  189         }
  190         db_add_symbol_table(NULL, NULL, "kld", NULL);
  191         return (1);     /* We're the default debugger. */
  192 }
  193 
  194 static int
  195 db_trap(int type, int code)
  196 {
  197         jmp_buf jb;
  198         void *prev_jb;
  199         boolean_t bkpt, watchpt;
  200         const char *why;
  201 
  202         /*
  203          * Don't handle the trap if the console is unavailable (i.e. it
  204          * is in graphics mode).
  205          */
  206         if (cnunavailable())
  207                 return (0);
  208 
  209         bkpt = IS_BREAKPOINT_TRAP(type, code);
  210         watchpt = IS_WATCHPOINT_TRAP(type, code);
  211 
  212         if (db_stop_at_pc(&bkpt)) {
  213                 if (db_inst_count) {
  214                         db_printf("After %d instructions (%d loads, %d stores),\n",
  215                             db_inst_count, db_load_count, db_store_count);
  216                 }
  217                 prev_jb = kdb_jmpbuf(jb);
  218                 if (setjmp(jb) == 0) {
  219                         db_dot = PC_REGS();
  220                         db_print_thread();
  221                         if (bkpt)
  222                                 db_printf("Breakpoint at\t");
  223                         else if (watchpt)
  224                                 db_printf("Watchpoint at\t");
  225                         else
  226                                 db_printf("Stopped at\t");
  227                         db_print_loc_and_inst(db_dot);
  228                 }
  229                 why = kdb_why;
  230                 db_script_kdbenter(why != KDB_WHY_UNSET ? why : "unknown");
  231                 db_command_loop();
  232                 (void)kdb_jmpbuf(prev_jb);
  233         }
  234 
  235         db_restart_at_pc(watchpt);
  236 
  237         return (1);
  238 }
  239 
  240 static void
  241 db_trace_self_wrapper(void)
  242 {
  243         jmp_buf jb;
  244         void *prev_jb;
  245 
  246         prev_jb = kdb_jmpbuf(jb);
  247         if (setjmp(jb) == 0)
  248                 db_trace_self();
  249         (void)kdb_jmpbuf(prev_jb);
  250 }
  251 
  252 static void
  253 db_trace_thread_wrapper(struct thread *td)
  254 {
  255         jmp_buf jb;
  256         void *prev_jb;
  257 
  258         prev_jb = kdb_jmpbuf(jb);
  259         if (setjmp(jb) == 0)
  260                 db_trace_thread(td, -1);
  261         (void)kdb_jmpbuf(prev_jb);
  262 }

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

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