/*      $NetBSD: bin_nlist.c,v 1.1 2016/09/21 16:25:41 christos Exp $   */

/*
* Copyright (c) 1996, 2002 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. 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.
*
* <<Id: LICENSE_GC,v 1.1 2001/10/01 23:24:05 cgd Exp>>
*/
#include <sys/cdefs.h>
__RCSID("$NetBSD: bin_nlist.c,v 1.1 2016/09/21 16:25:41 christos Exp $");

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <nlist.h>
#include <err.h>

#include "bin.h"
#include "extern.h"

struct bininfo {
       const char *fname;
       int kfd;
};

#define X_MD_ROOT_IMAGE 0
#define X_MD_ROOT_SIZE 1

struct {
       const char *name;
       int     (*check)(const char *, size_t);
       int     (*findoff)(const char *, size_t, u_long, size_t *, u_long);
} exec_formats[] = {
#ifdef NLIST_AOUT
       {       "a.out",        check_aout,     findoff_aout,   },
#endif
#ifdef NLIST_ECOFF
       {       "ECOFF",        check_ecoff,    findoff_ecoff,  },
#endif
#ifdef NLIST_ELF32
       {       "ELF32",        check_elf32,    findoff_elf32,  },
#endif
#ifdef NLIST_ELF64
       {       "ELF64",        check_elf64,    findoff_elf64,  },
#endif
#ifdef NLIST_COFF
       {       "COFF",         check_coff,     findoff_coff,   },
#endif
};

void *
bin_open(int kfd, const char *kfile, const char *bfdname)
{
       struct bininfo *bin;

       if ((bin = malloc(sizeof(*bin))) == NULL) {
               warn("%s", kfile);
               return NULL;
       }
       bin->kfd = kfd;
       bin->fname = kfile;

       return bin;
}


int
bin_find_md_root(void *binp, const char *mappedfile, off_t mappedsize,
   unsigned long text_start, const char *root_name, const char *size_name,
   size_t *md_root_image_offset, size_t *md_root_size_offset,
   uint32_t *md_root_size, int verbose)
{
       struct bininfo *bin = binp;
       struct nlist nl[3];
       size_t i, n = sizeof exec_formats / sizeof exec_formats[0];

       for (i = 0; i < n; i++) {
               if ((*exec_formats[i].check)(mappedfile, mappedsize) == 0)
                       break;
       }
       if (i == n) {
               warnx("%s: unknown executable format", bin->fname);
               return 1;
       }

       if (verbose) {
               fprintf(stderr, "%s is an %s binary\n", bin->fname,
                   exec_formats[i].name);
#ifdef NLIST_AOUT
               if (text_start != (unsigned long)~0)
                       fprintf(stderr, "kernel text loads at 0x%lx\n",
                           text_start);
#endif
       }

       (void)memset(nl, 0, sizeof(nl));
       N_NAME(&nl[X_MD_ROOT_IMAGE]) = root_name;
       N_NAME(&nl[X_MD_ROOT_SIZE]) = size_name;

       if (__fdnlist(bin->kfd, nl) != 0)
               return 1;

       if ((*exec_formats[i].findoff)(mappedfile, mappedsize,
           nl[1].n_value, md_root_size_offset, text_start) != 0) {
               warnx("couldn't find offset for %s in %s",
                   nl[X_MD_ROOT_SIZE].n_name, bin->fname);
               return 1;
       }
       if (verbose)
               fprintf(stderr, "%s is at offset %#zx in %s\n",
                   nl[X_MD_ROOT_SIZE].n_name, *md_root_size_offset,
                   bin->fname);
       memcpy(md_root_size, &mappedfile[*md_root_size_offset],
           sizeof(*md_root_size));
       if (verbose)
               fprintf(stderr, "%s has value %#x\n",
                   nl[X_MD_ROOT_SIZE].n_name, *md_root_size);

       if ((*exec_formats[i].findoff)(mappedfile, mappedsize,
           nl[0].n_value, md_root_image_offset, text_start) != 0) {
               warnx("couldn't find offset for %s in %s",
                   nl[X_MD_ROOT_IMAGE].n_name, bin->fname);
               return 1;
       }
       if (verbose)
               fprintf(stderr, "%s is at offset %#zx in %s\n",
                       nl[X_MD_ROOT_IMAGE].n_name,
                       *md_root_image_offset, bin->fname);

       return 0;
}

void
bin_put_32(void *bin, off_t size, char *buf)
{
       uint32_t s = (uint32_t)size;
       memcpy(buf, &s, sizeof(s));
}

void
bin_close(void *bin)
{
}

const char **
bin_supported_targets(void)
{
       static const char *fmts[] = {
#ifdef NLIST_AOUT
               "aout",
#endif
#ifdef NLIST_ECOFF
               "ecoff",
#endif
#ifdef NLIST_ELF32
               "elf32",
#endif
#ifdef NLIST_ELF64
               "elf64",
#endif
#ifdef NLIST_COFF
               "coff",
#endif
               NULL,
       };

       return fmts;
}