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+/*
+ * 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.
+ */
+/*
+ * HISTORY
+ * $Log: db_aout.c,v $
+ * Revision 1.1 1992/03/25 21:44:55 pace
+ * Initial revision
+ *
+ * Revision 2.3 91/02/05 17:05:55 mrt
+ * Changed to new Mach copyright
+ * [91/01/31 16:16:44 mrt]
+ *
+ * Revision 2.2 90/08/27 21:48:35 dbg
+ * Created.
+ * [90/08/17 dbg]
+ *
+ */
+/*
+ * Author: David B. Golub, Carnegie Mellon University
+ * Date: 7/90
+ */
+/*
+ * Symbol table routines for a.out format files.
+ */
+
+#include "param.h"
+#include "proc.h"
+#include <machine/db_machdep.h> /* data types */
+#include <ddb/db_sym.h>
+
+#ifndef DB_NO_AOUT
+
+#define _AOUT_INCLUDE_
+#include "nlist.h"
+
+/*
+ * An a.out symbol table as loaded into the kernel debugger:
+ *
+ * symtab -> size of symbol entries, in bytes
+ * sp -> first symbol entry
+ * ...
+ * ep -> last symbol entry + 1
+ * strtab == start of string table
+ * size of string table in bytes,
+ * including this word
+ * -> strings
+ */
+
+/*
+ * Find pointers to the start and end of the symbol entries,
+ * given a pointer to the start of the symbol table.
+ */
+#define db_get_aout_symtab(symtab, sp, ep) \
+ (sp = (struct nlist *)((symtab) + 1), \
+ ep = (struct nlist *)((char *)sp + *(symtab)))
+
+#define SYMTAB_SPACE 63000
+int db_symtabsize = SYMTAB_SPACE;
+char db_symtab[SYMTAB_SPACE] = { 1 };
+
+X_db_sym_init(symtab, esymtab, name)
+ int * symtab; /* pointer to start of symbol table */
+ char * esymtab; /* pointer to end of string table,
+ for checking - rounded up to integer
+ boundary */
+ char * name;
+{
+ register struct nlist *sym_start, *sym_end;
+ register struct nlist *sp;
+ register char * strtab;
+ register int strlen;
+
+ if (*symtab < 4) {
+ printf ("DDB: no symbols\n");
+ return;
+ }
+
+ db_get_aout_symtab(symtab, sym_start, sym_end);
+
+ strtab = (char *)sym_end;
+ strlen = *(int *)strtab;
+
+#if 0
+ if (strtab + ((strlen + sizeof(int) - 1) & ~(sizeof(int)-1))
+ != esymtab)
+ {
+ db_printf("[ %s symbol table not valid ]\n", name);
+ return;
+ }
+
+ db_printf("[ preserving %#x bytes of %s symbol table ]\n",
+ esymtab - (char *)symtab, name);
+#endif
+
+ for (sp = sym_start; sp < sym_end; sp++) {
+ register int strx;
+ strx = sp->n_un.n_strx;
+ if (strx != 0) {
+ if (strx > strlen) {
+ db_printf("Bad string table index (%#x)\n", strx);
+ sp->n_un.n_name = 0;
+ continue;
+ }
+ sp->n_un.n_name = strtab + strx;
+ }
+ }
+
+ db_add_symbol_table(sym_start, sym_end, name, (char *)symtab);
+}
+
+db_sym_t
+X_db_lookup(stab, symstr)
+ db_symtab_t *stab;
+ char * symstr;
+{
+ register struct nlist *sp, *ep;
+
+ sp = (struct nlist *)stab->start;
+ ep = (struct nlist *)stab->end;
+
+ for (; sp < ep; sp++) {
+ if (sp->n_un.n_name == 0)
+ continue;
+ if ((sp->n_type & N_STAB) == 0 &&
+ sp->n_un.n_name != 0 &&
+ db_eqname(sp->n_un.n_name, symstr, '_'))
+ {
+ return ((db_sym_t)sp);
+ }
+ }
+ return ((db_sym_t)0);
+}
+
+db_sym_t
+X_db_search_symbol(symtab, off, strategy, diffp)
+ db_symtab_t * symtab;
+ register
+ db_addr_t off;
+ db_strategy_t strategy;
+ db_expr_t *diffp; /* in/out */
+{
+ register unsigned int diff = *diffp;
+ register struct nlist *symp = 0;
+ register struct nlist *sp, *ep;
+
+ sp = (struct nlist *)symtab->start;
+ ep = (struct nlist *)symtab->end;
+
+ for (; sp < ep; sp++) {
+ if (sp->n_un.n_name == 0)
+ continue;
+ if ((sp->n_type & N_STAB) != 0)
+ continue;
+ if (off >= sp->n_value) {
+ if (off - sp->n_value < diff) {
+ diff = off - sp->n_value;
+ symp = sp;
+ if (diff == 0)
+ break;
+ }
+ else if (off - sp->n_value == diff) {
+ if (symp == 0)
+ symp = sp;
+ else if ((symp->n_type & N_EXT) == 0 &&
+ (sp->n_type & N_EXT) != 0)
+ symp = sp; /* pick the external symbol */
+ }
+ }
+ }
+ if (symp == 0) {
+ *diffp = off;
+ }
+ else {
+ *diffp = diff;
+ }
+ return ((db_sym_t)symp);
+}
+
+/*
+ * Return the name and value for a symbol.
+ */
+void
+X_db_symbol_values(sym, namep, valuep)
+ db_sym_t sym;
+ char **namep;
+ db_expr_t *valuep;
+{
+ register struct nlist *sp;
+
+ sp = (struct nlist *)sym;
+ if (namep)
+ *namep = sp->n_un.n_name;
+ if (valuep)
+ *valuep = sp->n_value;
+}
+
+boolean_t
+X_db_line_at_pc()
+{
+ return (FALSE);
+}
+
+/*
+ * Initialization routine for a.out files.
+ */
+kdb_init()
+{
+#if 0
+ extern char *esym;
+ extern int end;
+
+ if (esym > (char *)&end) {
+ X_db_sym_init((int *)&end, esym, "mach");
+ }
+#endif
+
+ X_db_sym_init (db_symtab, 0, "mach");
+}
+
+#if 0
+/*
+ * Read symbol table from file.
+ * (should be somewhere else)
+ */
+#include <boot_ufs/file_io.h>
+#include <vm/vm_kern.h>
+
+read_symtab_from_file(fp, symtab_name)
+ struct file *fp;
+ char * symtab_name;
+{
+ vm_size_t resid;
+ kern_return_t result;
+ vm_offset_t symoff;
+ vm_size_t symsize;
+ vm_offset_t stroff;
+ vm_size_t strsize;
+ vm_size_t table_size;
+ vm_offset_t symtab;
+
+ if (!get_symtab(fp, &symoff, &symsize)) {
+ boot_printf("[ error %d reading %s file header ]\n",
+ result, symtab_name);
+ return;
+ }
+
+ stroff = symoff + symsize;
+ result = read_file(fp, (vm_offset_t)stroff,
+ (vm_offset_t)&strsize, sizeof(strsize), &resid);
+ if (result || resid) {
+ boot_printf("[ no valid symbol table present for %s ]\n",
+ symtab_name);
+ return;
+ }
+
+ table_size = sizeof(int) + symsize + strsize;
+ table_size = (table_size + sizeof(int)-1) & ~(sizeof(int)-1);
+
+ symtab = kmem_alloc_wired(kernel_map, table_size);
+
+ *(int *)symtab = symsize;
+
+ result = read_file(fp, symoff,
+ symtab + sizeof(int), symsize, &resid);
+ if (result || resid) {
+ boot_printf("[ error %d reading %s symbol table ]\n",
+ result, symtab_name);
+ return;
+ }
+
+ result = read_file(fp, stroff,
+ symtab + sizeof(int) + symsize, strsize, &resid);
+ if (result || resid) {
+ boot_printf("[ error %d reading %s string table ]\n",
+ result, symtab_name);
+ return;
+ }
+
+ X_db_sym_init((int *)symtab,
+ (char *)(symtab + table_size),
+ symtab_name);
+
+}
+#endif
+
+#endif /* DB_NO_AOUT */
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