403 lines
8.8 KiB
C
403 lines
8.8 KiB
C
/*
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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
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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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* $FreeBSD$
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*/
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/*
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* Author: David B. Golub, Carnegie Mellon University
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* Date: 7/90
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*/
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/*
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* Symbol table routines for a.out format files.
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*/
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#if !defined(__ELF__) && !defined(__alpha__)
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <machine/bootinfo.h>
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#include <ddb/ddb.h>
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#include <ddb/db_sym.h>
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#define _AOUT_INCLUDE_
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#include <nlist.h>
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#include <stab.h>
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/*
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* An a.out symbol table as loaded into the kernel debugger:
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*
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* symtab -> size of symbol entries, in bytes
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* sp -> first symbol entry
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* ...
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* ep -> last symbol entry + 1
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* strtab == start of string table
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* size of string table in bytes,
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* including this word
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* -> strings
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*/
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static void X_db_sym_init __P((int *symtab, char *esymtab, char *name));
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/*
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* Find pointers to the start and end of the symbol entries,
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* given a pointer to the start of the symbol table.
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*/
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#define db_get_aout_symtab(symtab, sp, ep) \
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(sp = (struct nlist *)((symtab) + 1), \
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ep = (struct nlist *)((char *)sp + *(symtab)))
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static void
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X_db_sym_init(symtab, esymtab, name)
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int * symtab; /* pointer to start of symbol table */
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char * esymtab; /* pointer to end of string table,
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for checking - rounded up to integer
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boundary */
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char * name;
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{
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register struct nlist *sym_start, *sym_end;
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register struct nlist *sp;
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register char * strtab;
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register int strlen;
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if (*symtab < 4) {
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printf ("DDB: no symbols\n");
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return;
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}
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db_get_aout_symtab(symtab, sym_start, sym_end);
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strtab = (char *)sym_end;
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strlen = *(int *)strtab;
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if (strtab + ((strlen + sizeof(int) - 1) & ~(sizeof(int)-1))
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!= esymtab)
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{
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db_printf("[ %s symbol table not valid ]\n", name);
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return;
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}
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db_printf("[ preserving %#x bytes of %s symbol table ]\n",
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esymtab - (char *)symtab, name);
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for (sp = sym_start; sp < sym_end; sp++) {
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register int strx;
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strx = sp->n_un.n_strx;
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if (strx != 0) {
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if (strx > strlen) {
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db_printf("Bad string table index (%#x)\n", strx);
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sp->n_un.n_name = 0;
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continue;
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}
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sp->n_un.n_name = strtab + strx;
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}
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}
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db_add_symbol_table((char *)sym_start, (char *)sym_end, name,
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(char *)symtab);
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}
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c_db_sym_t
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X_db_lookup(stab, symstr)
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db_symtab_t *stab;
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const char * symstr;
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{
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register struct nlist *sp, *ep;
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sp = (struct nlist *)stab->start;
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ep = (struct nlist *)stab->end;
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for (; sp < ep; sp++) {
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if (sp->n_un.n_name == 0)
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continue;
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if ((sp->n_type & N_STAB) == 0 &&
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sp->n_un.n_name != 0 &&
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db_eqname(sp->n_un.n_name, symstr, '_'))
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{
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return ((db_sym_t)sp);
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}
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}
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return ((db_sym_t)0);
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}
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c_db_sym_t
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X_db_search_symbol(symtab, off, strategy, diffp)
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db_symtab_t * symtab;
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register
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db_addr_t off;
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db_strategy_t strategy;
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db_expr_t *diffp; /* in/out */
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{
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register unsigned int diff = *diffp;
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register struct nlist *symp = 0;
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register struct nlist *sp, *ep;
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sp = (struct nlist *)symtab->start;
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ep = (struct nlist *)symtab->end;
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for (; sp < ep; sp++) {
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if (sp->n_un.n_name == 0)
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continue;
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if ((sp->n_type & N_STAB) != 0 || (sp->n_type & N_TYPE) == N_FN)
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continue;
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if (off >= sp->n_value) {
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if (off - sp->n_value < diff) {
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diff = off - sp->n_value;
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symp = sp;
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if (diff == 0) {
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if (strategy == DB_STGY_PROC &&
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sp->n_type == (N_TEXT|N_EXT))
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break;
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if (strategy == DB_STGY_ANY &&
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(sp->n_type & N_EXT))
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break;
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}
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}
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else if (off - sp->n_value == diff) {
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if (symp == 0)
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symp = sp;
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else if ((symp->n_type & N_EXT) == 0 &&
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(sp->n_type & N_EXT) != 0)
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symp = sp; /* pick the external symbol */
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}
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}
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}
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if (symp == 0) {
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*diffp = off;
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}
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else {
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*diffp = diff;
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}
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return ((db_sym_t)symp);
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}
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/*
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* Return the name and value for a symbol.
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*/
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void
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X_db_symbol_values(symtab, sym, namep, valuep)
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db_symtab_t *symtab;
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c_db_sym_t sym;
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const char **namep;
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db_expr_t *valuep;
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{
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register const struct nlist *sp;
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sp = (const struct nlist *)sym;
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if (namep)
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*namep = sp->n_un.n_name;
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if (valuep)
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*valuep = sp->n_value;
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}
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boolean_t
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X_db_line_at_pc(symtab, cursym, filename, linenum, off)
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db_symtab_t * symtab;
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c_db_sym_t cursym;
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char **filename;
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int *linenum;
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db_expr_t off;
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{
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register struct nlist *sp, *ep;
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unsigned long sodiff = -1UL, lndiff = -1UL, ln = 0;
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char *fname = NULL;
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sp = (struct nlist *)symtab->start;
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ep = (struct nlist *)symtab->end;
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/*
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* XXX - this used to remove "gcc_compiled.", but that is obsolete. We
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* now remove unwanted names using symorder.
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*/
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#define NEWSRC(str) 0
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for (; sp < ep; sp++) {
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/*
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* Prevent bogus linenumbers in case module not compiled
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* with debugging options
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*/
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#if 0
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if (sp->n_value <= off && (off - sp->n_value) <= sodiff &&
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NEWSRC(sp->n_un.n_name)) {
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#endif
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if ((sp->n_type & N_TYPE) == N_FN || NEWSRC(sp->n_un.n_name)) {
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sodiff = lndiff = -1UL;
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ln = 0;
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fname = NULL;
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}
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if (sp->n_type == N_SO && *sp->n_un.n_name != '/') {
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if (sp->n_value <= off && (off - sp->n_value) < sodiff) {
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sodiff = off - sp->n_value;
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fname = sp->n_un.n_name;
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}
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continue;
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}
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if (sp->n_type != N_SLINE)
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continue;
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if (sp->n_value > off)
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break;
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if (off - sp->n_value < lndiff) {
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lndiff = off - sp->n_value;
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ln = sp->n_desc;
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}
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}
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if (fname != NULL && ln != 0) {
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*filename = fname;
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*linenum = ln;
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return TRUE;
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}
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return (FALSE);
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}
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boolean_t
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X_db_sym_numargs(symtab, cursym, nargp, argnamep)
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db_symtab_t * symtab;
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c_db_sym_t cursym;
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int *nargp;
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char **argnamep;
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{
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register struct nlist *sp, *ep;
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u_long addr;
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int maxnarg = *nargp, nargs = 0;
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if (cursym == NULL)
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return FALSE;
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addr = ((const struct nlist *)cursym)->n_value;
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sp = (struct nlist *)symtab->start;
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ep = (struct nlist *)symtab->end;
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for (; sp < ep; sp++) {
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if (sp->n_type == N_FUN && sp->n_value == addr) {
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while (++sp < ep && sp->n_type == N_PSYM) {
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if (nargs >= maxnarg)
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break;
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nargs++;
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*argnamep++ = sp->n_un.n_name?sp->n_un.n_name:"???";
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{
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/* XXX - remove trailers */
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char *cp = *(argnamep-1);
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while (*cp != '\0' && *cp != ':') cp++;
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if (*cp == ':') *cp = '\0';
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}
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}
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*nargp = nargs;
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return TRUE;
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}
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}
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return FALSE;
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}
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/*
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* Initialization routine for a.out files.
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*/
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void
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kdb_init()
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{
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#ifdef __i386__
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if (bootinfo.bi_esymtab != bootinfo.bi_symtab)
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X_db_sym_init((int *)bootinfo.bi_symtab,
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(char *)((bootinfo.bi_esymtab + sizeof(int) - 1)
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& ~(sizeof(int) - 1)),
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"kernel");
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#endif
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}
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#if 0
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/*
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* Read symbol table from file.
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* (should be somewhere else)
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*/
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#include <boot_ufs/file_io.h>
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#include <vm/vm_kern.h>
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read_symtab_from_file(fp, symtab_name)
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struct file *fp;
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char * symtab_name;
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{
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vm_size_t resid;
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kern_return_t result;
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vm_offset_t symoff;
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vm_size_t symsize;
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vm_offset_t stroff;
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vm_size_t strsize;
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vm_size_t table_size;
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vm_offset_t symtab;
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if (!get_symtab(fp, &symoff, &symsize)) {
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boot_printf("[ error %d reading %s file header ]\n",
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result, symtab_name);
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return;
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}
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stroff = symoff + symsize;
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result = read_file(fp, (vm_offset_t)stroff,
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(vm_offset_t)&strsize, sizeof(strsize), &resid);
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if (result || resid) {
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boot_printf("[ no valid symbol table present for %s ]\n",
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symtab_name);
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return;
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}
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table_size = sizeof(int) + symsize + strsize;
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table_size = (table_size + sizeof(int)-1) & ~(sizeof(int)-1);
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symtab = kmem_alloc_wired(kernel_map, table_size);
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*(int *)symtab = symsize;
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result = read_file(fp, symoff,
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symtab + sizeof(int), symsize, &resid);
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if (result || resid) {
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boot_printf("[ error %d reading %s symbol table ]\n",
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result, symtab_name);
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return;
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}
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result = read_file(fp, stroff,
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symtab + sizeof(int) + symsize, strsize, &resid);
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if (result || resid) {
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boot_printf("[ error %d reading %s string table ]\n",
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result, symtab_name);
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return;
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}
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X_db_sym_init((int *)symtab,
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(char *)(symtab + table_size),
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symtab_name);
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}
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#endif
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#endif
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