224 lines
6.7 KiB
C
224 lines
6.7 KiB
C
/* $NetBSD: setnetimage.c,v 1.3 2001/02/19 22:48:58 cgd Exp $ */
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/*-
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* Copyright (c) 1999 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Simon Burge.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <sys/exec_elf.h>
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#include <err.h>
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#include <fcntl.h>
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#include <nlist.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <zlib.h>
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#include "extern.h"
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#define MAX_SEGMENTS 10 /* We can load up to 10 segments */
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struct nlist nl[] = {
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#define X_KERNEL_ENTRY 0
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{ "_kernel_entry" },
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#define X_KERNEL_IMAGE 1
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{ "_kernel_image" },
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#define X_KERNEL_LOADADDR 2
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{ "_kernel_loadaddr" },
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#define X_KERNEL_SIZE 3
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{ "_kernel_size" },
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#define X_MAXKERNEL_SIZE 4
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{ "_maxkernel_size" },
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{ NULL }
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};
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#define X_NSYMS ((sizeof(nl) / sizeof(struct nlist)) - 1)
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struct seglist {
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Elf32_Addr addr;
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Elf32_Off f_offset;
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Elf32_Word f_size;
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};
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#define NLADDR(x) (mappedbfile + offsets[(x)])
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#define NLVAR(x) (*(u_long *)(NLADDR(x)))
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int main __P((int, char **));
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int
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main(argc, argv)
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int argc;
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char **argv;
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{
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int ifd, ofd, i, nsegs;
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size_t offsets[X_NSYMS];
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const char *kernel, *bootfile;
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char *mappedbfile;
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char *uncomp_kernel, *comp_kernel;
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Elf32_Addr lowaddr, highaddr;
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Elf32_Ehdr ehdr;
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Elf32_Phdr phdr;
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uLongf destlen;
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struct stat osb;
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struct seglist seglist[MAX_SEGMENTS];
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if (argc != 3) {
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fprintf(stderr, "usage: %s kernel bootfile\n", getprogname());
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exit(1);
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}
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kernel = argv[1];
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bootfile = argv[2];
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if ((ifd = open(kernel, O_RDONLY)) < 0)
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err(1, "%s", kernel);
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if ((ofd = open(bootfile, O_RDWR)) < 0)
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err(1, "%s", bootfile);
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if (nlist(bootfile, nl) != 0)
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errx(1, "Could not find symbols in %s", bootfile);
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if (fstat(ofd, &osb) == -1)
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err(1, "fstat %s", bootfile);
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if (osb.st_size > SIZE_T_MAX)
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errx(1, "%s too big to map", bootfile);
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if ((mappedbfile = mmap(NULL, osb.st_size, PROT_READ | PROT_WRITE,
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MAP_FILE | MAP_SHARED, ofd, 0)) == (caddr_t)-1)
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err(1, "mmap %s", bootfile);
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printf("mapped %s\n", bootfile);
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if (check_elf32(mappedbfile, osb.st_size) != 0)
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errx(1, "No ELF header in %s", bootfile);
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for (i = 0; i < X_NSYMS; i++) {
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if (findoff_elf32(mappedbfile, osb.st_size, nl[i].n_value, &offsets[i]) != 0)
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errx(1, "Couldn't find offset for %s in %s\n", nl[i].n_name, bootfile);
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#ifdef DEBUG
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printf("%s is at offset %#x in %s\n", nl[i].n_name, offsets[i], bootfile);
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#endif
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}
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/* read the exec header */
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i = read(ifd, (char *)&ehdr, sizeof(ehdr));
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if ((i != sizeof(ehdr)) ||
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(memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0) ||
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(ehdr.e_ident[EI_CLASS] != ELFCLASS32)) {
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errx(1, "No ELF header in %s", kernel);
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}
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nsegs = highaddr = 0;
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lowaddr = UINT_MAX;
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for (i = 0; i < ehdr.e_phnum; i++) {
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if (lseek(ifd, (off_t) ehdr.e_phoff + i * sizeof(phdr), 0) < 0)
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err(1, "%s", kernel);
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if (read(ifd, &phdr, sizeof(phdr)) != sizeof(phdr))
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err(1, "%s", kernel);
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if (phdr.p_type != PT_LOAD)
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continue;
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printf("load section %d at addr 0x%08x, file offset %8d, length %8d\n",
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i, phdr.p_paddr, phdr.p_offset, phdr.p_filesz);
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seglist[nsegs].addr = phdr.p_paddr;
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seglist[nsegs].f_offset = phdr.p_offset;
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seglist[nsegs].f_size = phdr.p_filesz;
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nsegs++;
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if (phdr.p_paddr < lowaddr)
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lowaddr = phdr.p_paddr;
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if (phdr.p_paddr + phdr.p_filesz > highaddr)
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highaddr = phdr.p_paddr + phdr.p_filesz;
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}
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#ifdef DEBUG
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printf("lowaddr = 0x%08x, highaddr = 0x%08x\n", lowaddr, highaddr);
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#endif
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printf("load address: 0x%08x\n", lowaddr);
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printf("entry point: 0x%08x\n", ehdr.e_entry);
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destlen = highaddr - lowaddr;
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uncomp_kernel = (char *)malloc(destlen);
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comp_kernel = (char *)malloc(destlen); /* Worst case... */
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for (i = 0; i < nsegs; i++) {
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#ifdef DEBUG
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printf("lseek(ifd, %d, 0)\n", seglist[i].f_offset);
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#endif
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if (lseek(ifd, (off_t)seglist[i].f_offset, 0) < 0)
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err(1, "%s", kernel);
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#ifdef DEBUG
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printf("read(ifd, %p, %d)\n", \
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uncomp_kernel + seglist[i].addr - lowaddr,
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seglist[i].f_size);
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#endif
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if (read(ifd, uncomp_kernel + seglist[i].addr - lowaddr,
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seglist[i].f_size) != seglist[i].f_size)
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err(1, "%s", kernel);
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}
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close(ifd);
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printf("Compressing %d bytes...", highaddr - lowaddr); fflush(stdout);
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i = compress2(comp_kernel, &destlen, uncomp_kernel, \
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highaddr - lowaddr, Z_BEST_COMPRESSION);
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if (i != Z_OK) {
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printf("\n");
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errx(1, "%s compression error %d\n", kernel, i);
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}
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printf("done.\n"); fflush(stdout);
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printf("max kernelsize = %ld\n", NLVAR(X_MAXKERNEL_SIZE));
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printf("compressed size = %ld\n", destlen);
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if (destlen > NLVAR(X_MAXKERNEL_SIZE))
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errx(1, "kernel %s is too big, "
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"increase KERNELSIZE to at least %ld\n",
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kernel, destlen);
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NLVAR(X_KERNEL_SIZE) = destlen;
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NLVAR(X_KERNEL_LOADADDR) = lowaddr;
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NLVAR(X_KERNEL_ENTRY) = ehdr.e_entry;
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memcpy(NLADDR(X_KERNEL_IMAGE), comp_kernel, destlen);
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munmap(mappedbfile, osb.st_size);
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printf("unmapped %s\n", bootfile);
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close(ofd);
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exit(0);
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}
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