455 lines
10 KiB
C
455 lines
10 KiB
C
/* $NetBSD: db_sym.c,v 1.41 2003/05/17 09:48:05 scw Exp $ */
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/*
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* Mach Operating System
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* Copyright (c) 1991,1990 Carnegie Mellon University
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: db_sym.c,v 1.41 2003/05/17 09:48:05 scw Exp $");
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#include "opt_ddbparam.h"
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#include <sys/param.h>
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#include <sys/proc.h>
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#include <sys/systm.h>
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#include <sys/ksyms.h>
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#include <machine/db_machdep.h>
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#include <ddb/db_lex.h>
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#include <ddb/db_sym.h>
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#include <ddb/db_output.h>
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#include <ddb/db_extern.h>
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#include <ddb/db_command.h>
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static void db_symsplit(char *, char **, char **);
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#ifdef DB_AOUT_SYMBOLS
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#define TBLNAME "netbsd"
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static int using_aout_symtab;
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const db_symformat_t *db_symformat;
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static db_forall_func_t db_sift;
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extern db_symformat_t db_symformat_aout;
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#endif
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/*
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* Initialize the kernel debugger by initializing the master symbol
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* table. Note that if initializing the master symbol table fails,
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* no other symbol tables can be loaded.
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*/
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void
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ddb_init(int symsize, void *vss, void *vse)
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{
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#ifdef DB_AOUT_SYMBOLS
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db_symformat = &db_symformat_aout;
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if ((*db_symformat->sym_init)(symsize, vss, vse, TBLNAME) == TRUE) {
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using_aout_symtab = TRUE;
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return;
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}
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#endif
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ksyms_init(symsize, vss, vse); /* Will complain if necessary */
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}
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boolean_t
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db_eqname(char *src, char *dst, int c)
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{
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if (!strcmp(src, dst))
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return (TRUE);
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if (src[0] == c)
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return (!strcmp(src+1,dst));
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return (FALSE);
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}
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boolean_t
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db_value_of_name(char *name, db_expr_t *valuep)
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{
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char *mod, *sym;
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long val;
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#ifdef DB_AOUT_SYMBOLS
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db_sym_t ssym;
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if (using_aout_symtab) {
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/*
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* Cannot load symtabs in a.out kernels, so the ':'
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* style of selecting modules is irrelevant.
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*/
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ssym = (*db_symformat->sym_lookup)(NULL, name);
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if (ssym == DB_SYM_NULL)
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return (FALSE);
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db_symbol_values(ssym, &name, valuep);
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return (TRUE);
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}
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#endif
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db_symsplit(name, &mod, &sym);
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if (ksyms_getval(mod, sym, &val, KSYMS_EXTERN) == 0) {
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*valuep = (db_expr_t)val;
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return TRUE;
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}
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if (ksyms_getval(mod, sym, &val, KSYMS_ANY) == 0) {
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*valuep = (db_expr_t)val;
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return TRUE;
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}
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return FALSE;
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}
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#ifdef DB_AOUT_SYMBOLS
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/* Private structure for passing args to db_sift() from db_sifting(). */
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struct db_sift_args {
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char *symstr;
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int mode;
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};
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/*
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* Does the work of db_sifting(), called once for each
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* symbol via db_forall(), prints out symbols matching
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* criteria.
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*/
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static void
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db_sift(db_symtab_t *stab, db_sym_t sym, char *name, char *suffix, int prefix,
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void *arg)
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{
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char c, sc;
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char *find, *p;
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size_t len;
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struct db_sift_args *dsa;
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dsa = (struct db_sift_args*)arg;
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find = dsa->symstr; /* String we're looking for. */
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p = name; /* String we're searching within. */
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/* Matching algorithm cribbed from strstr(), which is not
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in the kernel. */
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if ((c = *find++) != 0) {
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len = strlen(find);
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do {
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do {
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if ((sc = *p++) == 0)
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return;
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} while (sc != c);
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} while (strncmp(p, find, len) != 0);
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}
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if (dsa->mode=='F') /* ala ls -F */
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db_printf("%s%s ", name, suffix);
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else
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db_printf("%s ", name);
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}
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#endif
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/*
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* "Sift" for a partial symbol.
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* Named for the Sun OpenPROM command ("sifting").
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* If the symbol has a qualifier (e.g., ux:vm_map),
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* then only the specified symbol table will be searched;
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* otherwise, all symbol tables will be searched..
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*
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* "mode" is how-to-display, set from modifiers.
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*/
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void
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db_sifting(char *symstr, int mode)
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{
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char *mod, *sym;
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#ifdef DB_AOUT_SYMBOLS
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struct db_sift_args dsa;
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if (using_aout_symtab) {
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dsa.symstr = symstr;
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dsa.mode = mode;
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(*db_symformat->sym_forall)(NULL, db_sift, &dsa);
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db_printf("\n");
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return;
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}
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#endif
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db_symsplit(symstr, &mod, &sym);
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if (ksyms_sift(mod, sym, mode) == ENODEV)
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db_error("invalid symbol table name");
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}
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/*
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* Find the closest symbol to val, and return its name
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* and the difference between val and the symbol found.
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*/
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db_sym_t
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db_search_symbol(db_addr_t val, db_strategy_t strategy, db_expr_t *offp)
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{
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unsigned int diff;
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unsigned long naddr;
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db_sym_t ret = DB_SYM_NULL;
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const char *mod;
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char *sym;
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#ifdef DB_AOUT_SYMBOLS
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db_expr_t newdiff;
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db_sym_t ssym;
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if (using_aout_symtab) {
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newdiff = diff = ~0;
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ssym = (*db_symformat->sym_search)
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(NULL, val, strategy, &newdiff);
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if ((unsigned int) newdiff < diff) {
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diff = newdiff;
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ret = ssym;
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}
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*offp = diff;
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return ret;
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}
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#endif
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if (ksyms_getname(&mod, &sym, (vaddr_t)val, strategy) == 0) {
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(void)ksyms_getval(mod, sym, &naddr, KSYMS_ANY);
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diff = val - (db_addr_t)naddr;
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ret = (db_sym_t)naddr;
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}
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*offp = diff;
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return ret;
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}
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/*
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* Return name and value of a symbol
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*/
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void
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db_symbol_values(db_sym_t sym, char **namep, db_expr_t *valuep)
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{
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const char *mod;
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if (sym == DB_SYM_NULL) {
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*namep = 0;
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return;
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}
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#ifdef DB_AOUT_SYMBOLS
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if (using_aout_symtab) {
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db_expr_t value;
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(*db_symformat->sym_value)(NULL, sym, namep, &value);
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if (valuep)
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*valuep = value;
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return;
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}
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#endif
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if (ksyms_getname(&mod, namep, (vaddr_t)sym,
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KSYMS_ANY|KSYMS_EXACT) == 0) {
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if (valuep)
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*valuep = sym;
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} else
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*namep = NULL;
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}
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/*
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* Print a the closest symbol to value
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*
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* After matching the symbol according to the given strategy
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* we print it in the name+offset format, provided the symbol's
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* value is close enough (eg smaller than db_maxoff).
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* We also attempt to print [filename:linenum] when applicable
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* (eg for procedure names).
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*
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* If we could not find a reasonable name+offset representation,
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* then we just print the value in hex. Small values might get
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* bogus symbol associations, e.g. 3 might get some absolute
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* value like _INCLUDE_VERSION or something, therefore we do
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* not accept symbols whose value is zero (and use plain hex).
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* Also, avoid printing as "end+0x????" which is useless.
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* The variable db_lastsym is used instead of "end" in case we
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* add support for symbols in loadable driver modules.
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*/
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extern char end[];
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unsigned long db_lastsym = (unsigned long)end;
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unsigned int db_maxoff = 0x10000000;
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void
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db_symstr(char *buf, size_t buflen, db_expr_t off, db_strategy_t strategy)
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{
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char *name;
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const char *mod;
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long val;
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#ifdef DB_AOUT_SYMBOLS
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if (using_aout_symtab) {
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db_expr_t d;
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char *filename;
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char *name;
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db_expr_t value;
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int linenum;
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db_sym_t cursym;
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if ((unsigned long) off <= db_lastsym) {
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cursym = db_search_symbol(off, strategy, &d);
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db_symbol_values(cursym, &name, &value);
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if (name != NULL &&
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((unsigned int) d < db_maxoff) &&
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value != 0) {
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strlcpy(buf, name, buflen);
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if (d) {
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strlcat(buf, "+", buflen);
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db_format_radix(buf+strlen(buf),
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24, d, TRUE);
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}
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if (strategy == DB_STGY_PROC) {
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if ((*db_symformat->sym_line_at_pc)
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(NULL, cursym, &filename,
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&linenum, off))
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sprintf(buf+strlen(buf),
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" [%s:%d]",
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filename, linenum);
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}
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return;
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}
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}
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strlcpy(buf, db_num_to_str(off), buflen);
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return;
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}
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#endif
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if (ksyms_getname(&mod, &name, (vaddr_t)off,
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strategy|KSYMS_CLOSEST) == 0) {
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(void)ksyms_getval(mod, name, &val, KSYMS_ANY);
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if (((off - val) < db_maxoff) && val) {
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sprintf(buf, "%s:%s", mod, name);
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if (off - val) {
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strlcat(buf, "+", buflen);
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db_format_radix(buf+strlen(buf),
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24, off - val, TRUE);
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}
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#ifdef notyet
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if (strategy & KSYMS_PROC) {
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if (ksyms_fmaddr(off, &filename, &linenum) == 0) sprintf(buf+strlen(buf),
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" [%s:%d]", filename, linenum);
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}
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#endif
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return;
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}
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}
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strlcpy(buf, db_num_to_str(off), buflen);
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}
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void
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db_printsym(db_expr_t off, db_strategy_t strategy,
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void (*pr)(const char *, ...))
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{
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char *name;
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const char *mod;
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long val;
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#ifdef notyet
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char *filename;
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int linenum;
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#endif
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#ifdef DB_AOUT_SYMBOLS
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if (using_aout_symtab) {
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db_expr_t d;
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char *filename;
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char *name;
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db_expr_t value;
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int linenum;
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db_sym_t cursym;
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if ((unsigned long) off <= db_lastsym) {
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cursym = db_search_symbol(off, strategy, &d);
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db_symbol_values(cursym, &name, &value);
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if (name != NULL &&
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((unsigned int) d < db_maxoff) &&
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value != 0) {
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(*pr)("%s", name);
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if (d) {
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char tbuf[24];
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db_format_radix(tbuf, 24, d, TRUE);
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(*pr)("+%s", tbuf);
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}
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if (strategy == DB_STGY_PROC) {
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if ((*db_symformat->sym_line_at_pc)
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(NULL, cursym, &filename,
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&linenum, off))
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(*pr)(" [%s:%d]",
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filename, linenum);
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}
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return;
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}
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}
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(*pr)(db_num_to_str(off));
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return;
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}
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#endif
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if (ksyms_getname(&mod, &name, (vaddr_t)off,
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strategy|KSYMS_CLOSEST) == 0) {
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(void)ksyms_getval(mod, name, &val, KSYMS_ANY);
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if (((off - val) < db_maxoff) && val) {
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(*pr)("%s:%s", mod, name);
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if (off - val) {
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char tbuf[24];
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db_format_radix(tbuf, 24, off - val, TRUE);
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(*pr)("+%s", tbuf);
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}
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#ifdef notyet
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if (strategy & KSYMS_PROC) {
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if (ksyms_fmaddr(off, &filename, &linenum) == 0)
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(*pr)(" [%s:%d]", filename, linenum);
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}
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#endif
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return;
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}
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}
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(*pr)(db_num_to_str(off));
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return;
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}
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/*
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* Splits a string in the form "mod:sym" to two strings.
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*/
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static void
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db_symsplit(char *str, char **mod, char **sym)
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{
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char *cp;
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if ((cp = strchr(str, ':')) != NULL) {
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*cp++ = '\0';
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*mod = str;
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*sym = cp;
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} else {
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*mod = NULL;
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*sym = str;
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}
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}
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boolean_t
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db_sym_numargs(db_sym_t cursym, int *nargp, char **argnamep)
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{
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#ifdef DB_AOUT_SYMBOLS
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if (using_aout_symtab)
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return ((*db_symformat->sym_numargs)(NULL, cursym, nargp,
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argnamep));
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#endif
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return (FALSE);
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}
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