NetBSD/usr.sbin/kvm_mkdb/nlist_ecoff.c

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1996-10-04 03:14:23 +04:00
/* $NetBSD: nlist_ecoff.c,v 1.3 1996/10/03 23:14:23 cgd Exp $ */
/*
* Copyright (c) 1996 Christopher G. Demetriou. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Christopher G. Demetriou
* for the NetBSD Project.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef lint
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static char *rcsid = "$NetBSD: nlist_ecoff.c,v 1.3 1996/10/03 23:14:23 cgd Exp $";
#endif /* not lint */
#include <sys/param.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <a.out.h>
#include <db.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <kvm.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "extern.h"
#ifdef NLIST_ECOFF
#include <sys/exec_ecoff.h>
typedef struct nlist NLIST;
#define _strx n_un.n_strx
#define _name n_un.n_name
#define badfmt(str) \
do { \
warnx("%s: %s: %s", kfile, str, strerror(EFTYPE)); \
punt(); \
} while (0)
#define check(off, size) ((off < 0) || (off + size > mappedsize))
#define BAD do { rv = -1; goto out; } while (0)
#define BADUNMAP do { rv = -1; goto unmap; } while (0)
static const char *kfile;
int
create_knlist_ecoff(name, db)
const char *name;
DB *db;
{
struct ecoff_exechdr *exechdrp;
struct ecoff_symhdr *symhdrp;
struct ecoff_extsym *esyms;
struct stat st;
struct nlist nbuf;
DBT key, data;
char *mappedfile, *symname, *fsymname, *tmpcp;
size_t mappedsize, symnamesize, fsymnamesize;
u_long symhdroff, extrstroff;
u_long symhdrsize, i, nesyms;
int fd, rv;
rv = -1;
/*
* Open and map the whole file. If we can't open/stat it,
* something bad is going on so we punt.
*/
kfile = name;
if ((fd = open(name, O_RDONLY, 0)) < 0) {
warn("%s", kfile);
punt();
}
if (fstat(fd, &st) < 0) {
warn("%s", kfile);
punt();
}
if (st.st_size > SIZE_T_MAX)
BAD;
/*
* Map the file in its entirety.
*/
mappedsize = st.st_size;
mappedfile = mmap(NULL, mappedsize, PROT_READ, 0, fd, 0);
if (mappedfile == (char *)-1)
BAD;
/*
* Make sure we can access the executable's header
* directly, and make sure the recognize the executable
* as an ECOFF binary.
*/
if (check(0, sizeof *exechdrp))
BADUNMAP;
exechdrp = (struct ecoff_exechdr *)&mappedfile[0];
if (ECOFF_BADMAG(exechdrp))
BADUNMAP;
/*
* We've recognized it as an ECOFF binary. From here
* on out, all errors are fatal.
*/
/*
* Find the symbol list and string table.
*/
symhdroff = exechdrp->f.f_symptr;
symhdrsize = exechdrp->f.f_nsyms;
if (symhdrsize == 0)
badfmt("stripped");
if (check(symhdroff, sizeof *symhdrp) || sizeof *symhdrp != symhdrsize)
badfmt("bogus symbol table");
symhdrp = (struct ecoff_symhdr *)&mappedfile[symhdroff];
nesyms = symhdrp->esymMax;
if (check(symhdrp->cbExtOffset, nesyms * sizeof *esyms))
badfmt("bogus external symbol list");
esyms = (struct ecoff_extsym *)&mappedfile[symhdrp->cbExtOffset];
extrstroff = symhdrp->cbSsExtOffset;
/*
* Set up the data item, pointing to a nlist structure.
* which we fill in for each symbol.
*/
data.data = (u_char *)&nbuf;
data.size = sizeof(nbuf);
/*
* Create a buffer (to be expanded later, if necessary)
* to hold symbol names after we've added underscores
* to them.
*/
symnamesize = 1024;
if ((symname = malloc(symnamesize)) == NULL) {
warn("malloc");
punt();
}
/*
* Read each symbol and enter it into the database.
*/
for (i = 0; i < nesyms; i++) {
/*
* Find symbol name, copy it (with added underscore) to
* temporary buffer, and prepare the database key for
* insertion.
*/
fsymname = &mappedfile[extrstroff + esyms[i].es_strindex];
fsymnamesize = strlen(fsymname) + 1;
while (symnamesize < fsymnamesize + 1) {
symnamesize *= 2;
if ((symname = realloc(symname, symnamesize)) == NULL) {
warn("malloc");
punt();
}
}
strcpy(symname, "_");
strcat(symname, fsymname);
key.data = symname;
key.size = strlen((char *)key.data);
/*
* Convert the symbol information into an nlist structure,
* as best we can.
*/
nbuf.n_value = esyms[i].es_value;
nbuf.n_type = N_EXT; /* XXX */
nbuf.n_desc = 0; /* XXX */
nbuf.n_other = 0; /* XXX */
/*
* Enter the symbol into the database.
*/
if (db->put(db, &key, &data, 0)) {
warn("record enter");
punt();
}
/*
* If it's the kernel version string, we've gotta keep
* some extra data around. Under a seperate key,
* we enter the first line (i.e. up to the first newline,
* with the newline replaced by a NUL to terminate the
* entered string) of the version string.
*/
if (strcmp((char *)key.data, VRS_SYM) == 0) {
unsigned long vma;
key.data = (u_char *)VRS_KEY;
key.size = sizeof(VRS_KEY) - 1;
/* Find the version string, relative to start */
vma = nbuf.n_value;
if (exechdrp->a.text_start <= vma &&
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vma < (exechdrp->a.text_start + exechdrp->a.tsize))
vma = vma - exechdrp->a.text_start +
ECOFF_TXTOFF(exechdrp);
else if (exechdrp->a.data_start <= vma &&
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vma < (exechdrp->a.data_start + exechdrp->a.dsize))
vma = vma - exechdrp->a.data_start +
ECOFF_DATOFF(exechdrp);
else {
warn("version string neither text nor data");
punt();
}
data.data = strdup(&mappedfile[vma]);
/* assumes newline terminates version. */
if ((tmpcp = strchr(data.data, '\n')) != NULL)
*tmpcp = '\0';
data.size = strlen((char *)data.data);
if (db->put(db, &key, &data, 0)) {
warn("record enter");
punt();
}
/* free pointer created by strdup(). */
free(data.data);
/* Restore to original values */
data.data = (u_char *)&nbuf;
data.size = sizeof(nbuf);
}
}
rv = 0;
unmap:
munmap(mappedfile, mappedsize);
out:
return (rv);
}
#endif /* NLIST_ECOFF */