| File: | src/sys/arch/amd64/stand/pxeboot/../../../../lib/libsa/loadfile.c |
| Warning: | line 127, column 7 Although the value stored to 'nr' is used in the enclosing expression, the value is never actually read from 'nr' |
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| 1 | /* $NetBSD: loadfile.c,v 1.10 2000/12/03 02:53:04 tsutsui Exp $ */ |
| 2 | /* $OpenBSD: loadfile.c,v 1.21 2021/10/24 17:49:19 deraadt Exp $ */ |
| 3 | |
| 4 | /*- |
| 5 | * Copyright (c) 1997 The NetBSD Foundation, Inc. |
| 6 | * All rights reserved. |
| 7 | * |
| 8 | * This code is derived from software contributed to The NetBSD Foundation |
| 9 | * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, |
| 10 | * NASA Ames Research Center and by Christos Zoulas. |
| 11 | * |
| 12 | * Redistribution and use in source and binary forms, with or without |
| 13 | * modification, are permitted provided that the following conditions |
| 14 | * are met: |
| 15 | * 1. Redistributions of source code must retain the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer. |
| 17 | * 2. Redistributions in binary form must reproduce the above copyright |
| 18 | * notice, this list of conditions and the following disclaimer in the |
| 19 | * documentation and/or other materials provided with the distribution. |
| 20 | * |
| 21 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| 22 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 23 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 24 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| 25 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 26 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 27 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 28 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 29 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 30 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 31 | * POSSIBILITY OF SUCH DAMAGE. |
| 32 | */ |
| 33 | |
| 34 | /* |
| 35 | * Copyright (c) 1992, 1993 |
| 36 | * The Regents of the University of California. All rights reserved. |
| 37 | * |
| 38 | * This code is derived from software contributed to Berkeley by |
| 39 | * Ralph Campbell. |
| 40 | * |
| 41 | * Redistribution and use in source and binary forms, with or without |
| 42 | * modification, are permitted provided that the following conditions |
| 43 | * are met: |
| 44 | * 1. Redistributions of source code must retain the above copyright |
| 45 | * notice, this list of conditions and the following disclaimer. |
| 46 | * 2. Redistributions in binary form must reproduce the above copyright |
| 47 | * notice, this list of conditions and the following disclaimer in the |
| 48 | * documentation and/or other materials provided with the distribution. |
| 49 | * 3. Neither the name of the University nor the names of its contributors |
| 50 | * may be used to endorse or promote products derived from this software |
| 51 | * without specific prior written permission. |
| 52 | * |
| 53 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 54 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 55 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 56 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 57 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 58 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 59 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 60 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 61 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 62 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 63 | * SUCH DAMAGE. |
| 64 | * |
| 65 | * @(#)boot.c 8.1 (Berkeley) 6/10/93 |
| 66 | */ |
| 67 | |
| 68 | #ifdef _STANDALONE1 |
| 69 | #include <lib/libkern/libkern.h> |
| 70 | #include <lib/libsa/stand.h> |
| 71 | #else |
| 72 | #include <stdio.h> |
| 73 | #include <string.h> |
| 74 | #include <errno.h> |
| 75 | #include <stdlib.h> |
| 76 | #include <unistd.h> |
| 77 | #include <fcntl.h> |
| 78 | #include <err.h> |
| 79 | #endif |
| 80 | |
| 81 | #include <sys/param.h> |
| 82 | #include <sys/exec.h> |
| 83 | |
| 84 | #include "loadfile.h" |
| 85 | |
| 86 | #ifdef BOOT_ELF |
| 87 | #include <sys/exec_elf.h> |
| 88 | #if defined(BOOT_ELF32) && defined(BOOT_ELF64) |
| 89 | /* |
| 90 | * Both defined, so elf32_exec() and elf64_exec() need to be separately |
| 91 | * created (can't do it by including loadfile_elf.c here). |
| 92 | */ |
| 93 | int elf32_exec(int, Elf32_Ehdr *, uint64_t *, int); |
| 94 | int elf64_exec(int, Elf64_Ehdr *, uint64_t *, int); |
| 95 | #else |
| 96 | #include "loadfile_elf.c" |
| 97 | #endif |
| 98 | #endif |
| 99 | |
| 100 | /* |
| 101 | * Open 'filename', read in program and return -1 on error otherwise fd, |
| 102 | * with file still open. |
| 103 | * Also fills in marks. |
| 104 | */ |
| 105 | int |
| 106 | loadfile(const char *fname, uint64_t *marks, int flags) |
| 107 | { |
| 108 | union { |
| 109 | #if defined(BOOT_ELF32) || (defined(BOOT_ELF) && ELFSIZE64 == 32) |
| 110 | Elf32_Ehdr elf32; |
| 111 | #endif |
| 112 | #if defined(BOOT_ELF64) || (defined(BOOT_ELF) && ELFSIZE64 == 64) |
| 113 | Elf64_Ehdr elf64; |
| 114 | #endif |
| 115 | |
| 116 | } hdr; |
| 117 | ssize_t nr; |
| 118 | int fd, rval; |
| 119 | |
| 120 | /* Open the file. */ |
| 121 | if ((fd = open(fname, O_RDONLY0x0000)) < 0) { |
| 122 | WARN(("open %s", fname ? fname : "<default>"))(void)(printf ("open %s", fname ? fname : "<default>"), printf((errno ? ": %s\n" : "\n"), strerror(errno))); |
| 123 | return -1; |
| 124 | } |
| 125 | |
| 126 | /* Read the exec header. */ |
| 127 | if ((nr = read(fd, &hdr, sizeof(hdr))) != sizeof(hdr)) { |
Although the value stored to 'nr' is used in the enclosing expression, the value is never actually read from 'nr' | |
| 128 | WARN(("read header"))(void)(printf ("read header"), printf((errno ? ": %s\n" : "\n" ), strerror(errno))); |
| 129 | goto err; |
| 130 | } |
| 131 | |
| 132 | #if defined(BOOT_ELF32) || (defined(BOOT_ELF) && ELFSIZE64 == 32) |
| 133 | if (memcmp(hdr.elf32.e_ident, ELFMAG"\177ELF", SELFMAG4) == 0 && |
| 134 | hdr.elf32.e_ident[EI_CLASS4] == ELFCLASS321) { |
| 135 | rval = elf32_exec(fd, &hdr.elf32, marks, flags); |
| 136 | } else |
| 137 | #endif |
| 138 | #if defined(BOOT_ELF64) || (defined(BOOT_ELF) && ELFSIZE64 == 64) |
| 139 | if (memcmp(hdr.elf64.e_ident, ELFMAG"\177ELF", SELFMAG4) == 0 && |
| 140 | hdr.elf64.e_ident[EI_CLASS4] == ELFCLASS642) { |
| 141 | rval = elf64_exec(fd, &hdr.elf64, marks, flags); |
| 142 | } else |
| 143 | #endif |
| 144 | { |
| 145 | rval = 1; |
| 146 | errno = EFTYPE79; |
| 147 | WARN(("%s", fname ? fname : "<default>"))(void)(printf ("%s", fname ? fname : "<default>"), printf ((errno ? ": %s\n" : "\n"), strerror(errno))); |
| 148 | } |
| 149 | |
| 150 | if (rval == 0) { |
| 151 | PROGRESS(("=0x%lx\n", marks[MARK_END] - marks[MARK_START]))(void) printf ("=0x%lx\n", marks[4] - marks[0]); |
| 152 | return fd; |
| 153 | } |
| 154 | err: |
| 155 | (void)close(fd); |
| 156 | return -1; |
| 157 | } |