diff options
Diffstat (limited to 'sys/ddb/db_main.c')
| -rw-r--r-- | sys/ddb/db_main.c | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/sys/ddb/db_main.c b/sys/ddb/db_main.c new file mode 100644 index 0000000..32dd347 --- /dev/null +++ b/sys/ddb/db_main.c @@ -0,0 +1,226 @@ +/* + * Mach Operating System + * Copyright (c) 1991,1990 Carnegie Mellon University + * All Rights Reserved. + * + * Permission to use, copy, modify and distribute this software and its + * documentation is hereby granted, provided that both the copyright + * notice and this permission notice appear in all copies of the + * software, derivative works or modified versions, and any portions + * thereof, and that both notices appear in supporting documentation. + * + * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS + * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR + * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. + * + * Carnegie Mellon requests users of this software to return to + * + * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU + * School of Computer Science + * Carnegie Mellon University + * Pittsburgh PA 15213-3890 + * + * any improvements or extensions that they make and grant Carnegie the + * rights to redistribute these changes. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/cons.h> +#include <sys/linker.h> +#include <sys/kdb.h> +#include <sys/kernel.h> +#include <sys/pcpu.h> +#include <sys/proc.h> +#include <sys/reboot.h> + +#include <machine/kdb.h> +#include <machine/pcb.h> +#include <machine/setjmp.h> + +#include <ddb/ddb.h> +#include <ddb/db_command.h> +#include <ddb/db_sym.h> + +static dbbe_init_f db_init; +static dbbe_trap_f db_trap; + +KDB_BACKEND(ddb, db_init, db_trace_self, db_trap); + +vm_offset_t ksym_start, ksym_end; + +boolean_t +X_db_line_at_pc(db_symtab_t *symtab, c_db_sym_t sym, char **file, int *line, + db_expr_t off) +{ + return (FALSE); +} + +c_db_sym_t +X_db_lookup(db_symtab_t *symtab, const char *symbol) +{ + c_linker_sym_t lsym; + Elf_Sym *sym; + + if (symtab->private == NULL) { + return ((c_db_sym_t)((!linker_ddb_lookup(symbol, &lsym)) + ? lsym : NULL)); + } else { + sym = (Elf_Sym *)symtab->start; + while ((char *)sym < symtab->end) { + if (sym->st_name != 0 && + !strcmp(symtab->private + sym->st_name, symbol)) + return ((c_db_sym_t)sym); + sym++; + } + } + return (NULL); +} + +c_db_sym_t +X_db_search_symbol(db_symtab_t *symtab, db_addr_t off, db_strategy_t strat, + db_expr_t *diffp) +{ + c_linker_sym_t lsym; + Elf_Sym *sym, *match; + unsigned long diff; + + if (symtab->private == NULL) { + if (!linker_ddb_search_symbol((caddr_t)off, &lsym, &diff)) { + *diffp = (db_expr_t)diff; + return ((c_db_sym_t)lsym); + } + return (NULL); + } + + diff = ~0UL; + match = NULL; + for (sym = (Elf_Sym*)symtab->start; (char*)sym < symtab->end; sym++) { + if (sym->st_name == 0) + continue; + if (off < sym->st_value) + continue; + if (ELF_ST_TYPE(sym->st_info) != STT_OBJECT && + ELF_ST_TYPE(sym->st_info) != STT_FUNC && + ELF_ST_TYPE(sym->st_info) != STT_NOTYPE) + continue; + if ((off - sym->st_value) > diff) + continue; + if ((off - sym->st_value) < diff) { + diff = off - sym->st_value; + match = sym; + } else { + if (match == NULL) + match = sym; + else if (ELF_ST_BIND(match->st_info) == STB_LOCAL && + ELF_ST_BIND(sym->st_info) != STB_LOCAL) + match = sym; + } + if (diff == 0) { + if (strat == DB_STGY_PROC && + ELF_ST_TYPE(sym->st_info) == STT_FUNC && + ELF_ST_BIND(sym->st_info) != STB_LOCAL) + break; + if (strat == DB_STGY_ANY && + ELF_ST_BIND(sym->st_info) != STB_LOCAL) + break; + } + } + + *diffp = (match == NULL) ? off : diff; + return ((c_db_sym_t)match); +} + +boolean_t +X_db_sym_numargs(db_symtab_t *symtab, c_db_sym_t sym, int *nargp, + char **argp) +{ + return (FALSE); +} + +void +X_db_symbol_values(db_symtab_t *symtab, c_db_sym_t sym, const char **namep, + db_expr_t *valp) +{ + linker_symval_t lval; + + if (symtab->private == NULL) { + linker_ddb_symbol_values((c_linker_sym_t)sym, &lval); + if (namep != NULL) + *namep = (const char*)lval.name; + if (valp != NULL) + *valp = (db_expr_t)lval.value; + } else { + if (namep != NULL) + *namep = (const char *)symtab->private + + ((const Elf_Sym *)sym)->st_name; + if (valp != NULL) + *valp = (db_expr_t)((const Elf_Sym *)sym)->st_value; + } +} + +static int +db_init(void) +{ + uintptr_t symtab, strtab; + Elf_Size tabsz, strsz; + + if (ksym_end > ksym_start && ksym_start != 0) { + symtab = ksym_start; + tabsz = *((Elf_Size*)symtab)++; + strtab = symtab + tabsz; + strsz = *((Elf_Size*)strtab)++; + if (strtab + strsz <= ksym_end) { + db_add_symbol_table((char *)symtab, + (char *)(symtab + tabsz), "elf", (char *)strtab); + } + } + db_add_symbol_table(NULL, NULL, "kld", NULL); + return (1); /* We're the default debugger. */ +} + +static int +db_trap(int type, int code) +{ + jmp_buf jb; + void *prev_jb; + boolean_t bkpt, watchpt; + + /* + * Don't handle the trap if the console is unavailable (i.e. it + * is in graphics mode). + */ + if (cnunavailable()) + return (0); + + bkpt = IS_BREAKPOINT_TRAP(type, code); + watchpt = IS_WATCHPOINT_TRAP(type, code); + + if (db_stop_at_pc(&bkpt)) { + if (db_inst_count) { + db_printf("After %d instructions (%d loads, %d stores),\n", + db_inst_count, db_load_count, db_store_count); + } + prev_jb = kdb_jmpbuf(jb); + if (setjmp(jb) == 0) { + db_dot = PC_REGS(); + db_print_thread(); + if (bkpt) + db_printf("Breakpoint at\t"); + else if (watchpt) + db_printf("Watchpoint at\t"); + else + db_printf("Stopped at\t"); + db_print_loc_and_inst(db_dot); + } + db_command_loop(); + (void)kdb_jmpbuf(prev_jb); + } + + db_restart_at_pc(watchpt); + + return (1); +} |
