/*
* 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.
*
* $FreeBSD$
*/
/*
* Author: David B. Golub, Carnegie Mellon University
* Date: 7/90
*/
/*
* Symbol table routines for a.out format files.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <machine/bootinfo.h>
#include <ddb/ddb.h>
#include <ddb/db_sym.h>
#ifndef DB_NO_AOUT
#define _AOUT_INCLUDE_
#include <nlist.h>
#include <stab.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
*/
static void X_db_sym_init __P((int *symtab, char *esymtab, char *name));
/*
* 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)))
static void
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 (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);
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((char *)sym_start, (char *)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 || (sp->n_type & N_TYPE) == N_FN)
continue;
if (off >= sp->n_value) {
if (off - sp->n_value < diff) {
diff = off - sp->n_value;
symp = sp;
if (diff == 0) {
if (strategy == DB_STGY_PROC &&
sp->n_type == (N_TEXT|N_EXT))
break;
if (strategy == DB_STGY_ANY &&
(sp->n_type & N_EXT))
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(symtab, cursym, filename, linenum, off)
db_symtab_t * symtab;
db_sym_t cursym;
char **filename;
int *linenum;
db_expr_t off;
{
register struct nlist *sp, *ep;
unsigned long sodiff = -1UL, lndiff = -1UL, ln = 0;
char *fname = NULL;
sp = (struct nlist *)symtab->start;
ep = (struct nlist *)symtab->end;
/*
* XXX - this used to remove "gcc_compiled.", but that is obsolete. We
* now remove unwanted names using symorder.
*/
#define NEWSRC(str) 0
for (; sp < ep; sp++) {
/*
* Prevent bogus linenumbers in case module not compiled
* with debugging options
*/
#if 0
if (sp->n_value <= off && (off - sp->n_value) <= sodiff &&
NEWSRC(sp->n_un.n_name)) {
#endif
if ((sp->n_type & N_TYPE) == N_FN || NEWSRC(sp->n_un.n_name)) {
sodiff = lndiff = -1UL;
ln = 0;
fname = NULL;
}
if (sp->n_type == N_SO) {
if (sp->n_value <= off && (off - sp->n_value) < sodiff) {
sodiff = off - sp->n_value;
fname = sp->n_un.n_name;
}
continue;
}
if (sp->n_type != N_SLINE)
continue;
if (sp->n_value > off)
break;
if (off - sp->n_value < lndiff) {
lndiff = off - sp->n_value;
ln = sp->n_desc;
}
}
if (fname != NULL && ln != 0) {
*filename = fname;
*linenum = ln;
return TRUE;
}
return (FALSE);
}
boolean_t
X_db_sym_numargs(symtab, cursym, nargp, argnamep)
db_symtab_t * symtab;
db_sym_t cursym;
int *nargp;
char **argnamep;
{
register struct nlist *sp, *ep;
u_long addr;
int maxnarg = *nargp, nargs = 0;
if (cursym == NULL)
return FALSE;
addr = ((struct nlist *)cursym)->n_value;
sp = (struct nlist *)symtab->start;
ep = (struct nlist *)symtab->end;
for (; sp < ep; sp++) {
if (sp->n_type == N_FUN && sp->n_value == addr) {
while (++sp < ep && sp->n_type == N_PSYM) {
if (nargs >= maxnarg)
break;
nargs++;
*argnamep++ = sp->n_un.n_name?sp->n_un.n_name:"???";
{
/* XXX - remove trailers */
char *cp = *(argnamep-1);
while (*cp != '\0' && *cp != ':') cp++;
if (*cp == ':') *cp = '\0';
}
}
*nargp = nargs;
return TRUE;
}
}
return FALSE;
}
/*
* Initialization routine for a.out files.
*/
void
kdb_init(void)
{
if (bootinfo.bi_esymtab != bootinfo.bi_symtab)
X_db_sym_init((int *)bootinfo.bi_symtab,
(char *)((bootinfo.bi_esymtab + sizeof(int) - 1)
& ~(sizeof(int) - 1)),
"kernel");
}
#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 */
