/* $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 #include #include #include #include #include #include #include #include #include #include #include #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); }