/* $OpenBSD: exec_elf.c,v 1.3 2001/01/25 05:42:12 art Exp $ */ /* * Copyright (c) 1999 Mats O Jansson. 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 Mats O Jansson. * 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 static char rcsid[] = "$OpenBSD: exec_elf.c,v 1.3 2001/01/25 05:42:12 art Exp $"; #endif #include #include #include #include #include #include #include #include #include #include #include "ukc.h" caddr_t ptr,rest,pre; Elf_Ehdr elf_ex; Elf_Phdr *elf_phdr; Elf_Shdr *elf_shdr; char *elf_total; char *elf_shstrtab; off_t elf_size; caddr_t elf_adjust(x) caddr_t x; { int i; Elf_Shdr *s; unsigned long y = 0; s = elf_shdr; for (i = 0; i < elf_ex.e_shnum; i++) { if (s[i].sh_addr == 0) continue; if (((unsigned long)x >= s[i].sh_addr) && ((unsigned long)x < (s[i].sh_addr+s[i].sh_size))) { y = (unsigned long)&elf_total[(unsigned long)x - s[i].sh_addr + s[i].sh_offset]; break; } } return((caddr_t)y); } caddr_t elf_readjust(x) caddr_t x; { int i; Elf_Shdr *s; unsigned long y = 0; s = elf_shdr; for (i = 0; i < elf_ex.e_shnum; i++) { if (s[i].sh_addr == 0) continue; if (((x - elf_total) >= s[i].sh_offset) && ((x - elf_total) <= (s[i].sh_offset + s[i].sh_size))) y = x - elf_total + s[i].sh_addr; } return((caddr_t)y); } int elf_check(file) char *file; { int fd,ret = 1; if ((fd = open(file, O_RDONLY | O_EXLOCK, 0)) < 0) return (0); if (read(fd, (char *)&elf_ex, sizeof(elf_ex)) != sizeof(elf_ex)) ret = 0; if (ret) { if (!IS_ELF(elf_ex)) ret = 0; } close(fd); return (ret); } void elf_loadkernel(file) char *file; { int fd; Elf_Phdr *p; Elf_Shdr *s; if ((fd = open(file, O_RDONLY | O_EXLOCK, 0)) < 0) err(1, "%s", file); if (read(fd, (char *)&elf_ex, sizeof(elf_ex)) != sizeof(elf_ex)) errx(1, "can't read elf header"); if (!IS_ELF(elf_ex)) errx(1, "bad elf magic\n"); elf_size = lseek(fd, 0L, SEEK_END); (void)lseek(fd, 0L, SEEK_SET); elf_total = malloc(elf_size); if (read(fd, elf_total, elf_size) != elf_size) errx(1, "can't read elf kernel"); elf_phdr = (Elf_Phdr *)&elf_total[elf_ex.e_phoff]; elf_shdr = (Elf_Shdr *)&elf_total[elf_ex.e_shoff]; p = elf_phdr; s = elf_shdr; elf_shstrtab = &elf_total[elf_shdr[elf_ex.e_shstrndx].sh_offset]; close(fd); } void elf_savekernel(outfile) char *outfile; { int fd; if ((fd = open(outfile, O_WRONLY | O_CREAT | O_TRUNC, 0755)) < 0) err(1, "%s", outfile); if (write(fd, elf_total, elf_size) != elf_size) errx(1, "can't write file %s", outfile); close(fd); }