* Copyright (c) 1999 The NetBSD Foundation, Inc.

/* $NetBSD: setnetimage.c,v 1.8 2009/03/14 15:36:12 dsl Exp $ */

/*-
* Copyright (c) 1999 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Simon Burge.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``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 FOUNDATION OR CONTRIBUTORS
* 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.
*/

#include <sys/types.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/exec_elf.h>

#include <err.h>
#include <fcntl.h>
#include <nlist.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <zlib.h>

#include "extern.h"

#define MAX_SEGMENTS 10 /* We can load up to 10 segments */

struct nlist nl[] = {
#define X_KERNEL_ENTRY 0
{ "_kernel_entry" },
#define X_KERNEL_IMAGE 1
{ "_kernel_image" },
#define X_KERNEL_LOADADDR 2
{ "_kernel_loadaddr" },
#define X_KERNEL_SIZE 3
{ "_kernel_size" },
#define X_MAXKERNEL_SIZE 4
{ "_maxkernel_size" },
{ NULL }
};
#define X_NSYMS ((sizeof(nl) / sizeof(struct nlist)) - 1)

struct seglist {
Elf32_Addr addr;
Elf32_Off f_offset;
Elf32_Word f_size;
};

#define NLADDR(x) (mappedbfile + offsets[(x)])
#define NLVAR(x) (*(u_long *)(NLADDR(x)))

int main(int, char **);

int
main(int argc, char **argv)
{
int ifd, ofd, i, nsegs;
size_t offsets[X_NSYMS];
const char *kernel, *bootfile;
char *mappedbfile;
char *uncomp_kernel, *comp_kernel;
Elf32_Addr lowaddr, highaddr;
Elf32_Ehdr ehdr;
Elf32_Phdr phdr;
uLongf destlen;
struct stat osb;
struct seglist seglist[MAX_SEGMENTS];

if (argc != 3) {
fprintf(stderr, "usage: %s kernel bootfile\n", getprogname());
exit(1);
}

kernel = argv[1];
bootfile = argv[2];

if ((ifd = open(kernel, O_RDONLY)) < 0)
err(1, "%s", kernel);

if ((ofd = open(bootfile, O_RDWR)) < 0)
err(1, "%s", bootfile);

if (nlist(bootfile, nl) != 0)
errx(1, "Could not find symbols in %s", bootfile);

if (fstat(ofd, &osb) == -1)
err(1, "fstat %s", bootfile);
if (osb.st_size > SIZE_T_MAX)
errx(1, "%s too big to map", bootfile);

if ((mappedbfile = mmap(NULL, osb.st_size, PROT_READ | PROT_WRITE,
MAP_FILE | MAP_SHARED, ofd, 0)) == (void *)-1)
err(1, "mmap %s", bootfile);
printf("mapped %s\n", bootfile);

if (check_elf32(mappedbfile, osb.st_size) != 0)
errx(1, "No ELF header in %s", bootfile);

for (i = 0; i < X_NSYMS; i++) {
if (findoff_elf32(mappedbfile, osb.st_size, nl[i].n_value, &offsets[i]) != 0)
errx(1, "Couldn't find offset for %s in %s", nl[i].n_name, bootfile);
#ifdef DEBUG
printf("%s is at offset %#x in %s\n", nl[i].n_name, offsets[i], bootfile);
#endif
}

/* read the exec header */
i = read(ifd, (char *)&ehdr, sizeof(ehdr));
if ((i != sizeof(ehdr)) ||
(memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0) ||
(ehdr.e_ident[EI_CLASS] != ELFCLASS32)) {
errx(1, "No ELF header in %s", kernel);
}

nsegs = highaddr = 0;
lowaddr = UINT_MAX;
for (i = 0; i < ehdr.e_phnum; i++) {
if (lseek(ifd, (off_t) ehdr.e_phoff + i * sizeof(phdr), 0) < 0)
err(1, "%s", kernel);
if (read(ifd, &phdr, sizeof(phdr)) != sizeof(phdr))
err(1, "%s", kernel);
if (phdr.p_type != PT_LOAD)
continue;

printf("load section %d at addr 0x%08x, file offset %8d, length %8d\n",
i, phdr.p_paddr, phdr.p_offset, phdr.p_filesz);

seglist[nsegs].addr = phdr.p_paddr;
seglist[nsegs].f_offset = phdr.p_offset;
seglist[nsegs].f_size = phdr.p_filesz;
nsegs++;

if (phdr.p_paddr < lowaddr)
lowaddr = phdr.p_paddr;
if (phdr.p_paddr + phdr.p_filesz > highaddr)
highaddr = phdr.p_paddr + phdr.p_filesz;

}

#ifdef DEBUG
printf("lowaddr = 0x%08x, highaddr = 0x%08x\n", lowaddr, highaddr);
#endif
printf("load address: 0x%08x\n", lowaddr);
printf("entry point: 0x%08x\n", ehdr.e_entry);

destlen = highaddr - lowaddr;

uncomp_kernel = (char *)malloc(destlen);
comp_kernel = (char *)malloc(destlen); /* Worst case... */
for (i = 0; i < nsegs; i++) {
#ifdef DEBUG
printf("lseek(ifd, %d, 0)\n", seglist[i].f_offset);
#endif
if (lseek(ifd, (off_t)seglist[i].f_offset, 0) < 0)
err(1, "%s", kernel);
#ifdef DEBUG
printf("read(ifd, %p, %d)\n", \
uncomp_kernel + seglist[i].addr - lowaddr,
seglist[i].f_size);
#endif
if (read(ifd, uncomp_kernel + seglist[i].addr - lowaddr,
seglist[i].f_size) != seglist[i].f_size)
err(1, "%s", kernel);
}
close(ifd);

printf("Compressing %d bytes...", highaddr - lowaddr); fflush(stdout);
i = compress2(comp_kernel, &destlen, uncomp_kernel, \
highaddr - lowaddr, Z_BEST_COMPRESSION);
if (i != Z_OK) {
printf("\n");
errx(1, "%s compression error %d", kernel, i);
}
printf("done.\n"); fflush(stdout);

printf("max kernelsize = %ld\n", NLVAR(X_MAXKERNEL_SIZE));
printf("compressed size = %ld\n", destlen);
if (destlen > NLVAR(X_MAXKERNEL_SIZE))
errx(1, "kernel %s is too big, "
"increase KERNELSIZE to at least %ld",
kernel, destlen);

NLVAR(X_KERNEL_SIZE) = destlen;
NLVAR(X_KERNEL_LOADADDR) = lowaddr;
NLVAR(X_KERNEL_ENTRY) = ehdr.e_entry;
memcpy(NLADDR(X_KERNEL_IMAGE), comp_kernel, destlen);
munmap(mappedbfile, osb.st_size);
printf("unmapped %s\n", bootfile);
close(ofd);

exit(0);
}