| 1 | /*␊ |
| 2 | * Copyright (c) 1999-2003 Apple Computer, Inc. All rights reserved.␊ |
| 3 | *␊ |
| 4 | * @APPLE_LICENSE_HEADER_START@␊ |
| 5 | * ␊ |
| 6 | * Portions Copyright (c) 1999-2003 Apple Computer, Inc. All Rights␊ |
| 7 | * Reserved. This file contains Original Code and/or Modifications of␊ |
| 8 | * Original Code as defined in and that are subject to the Apple Public␊ |
| 9 | * Source License Version 2.0 (the "License"). You may not use this file␊ |
| 10 | * except in compliance with the License. Please obtain a copy of the␊ |
| 11 | * License at http://www.apple.com/publicsource and read it before using␊ |
| 12 | * this file.␊ |
| 13 | * ␊ |
| 14 | * The Original Code and all software distributed under the License are␊ |
| 15 | * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER␊ |
| 16 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,␊ |
| 17 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,␊ |
| 18 | * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT. Please see the␊ |
| 19 | * License for the specific language governing rights and limitations␊ |
| 20 | * under the License.␊ |
| 21 | * ␊ |
| 22 | * @APPLE_LICENSE_HEADER_END@␊ |
| 23 | */␊ |
| 24 | #include <stdio.h>␊ |
| 25 | #include <stdlib.h>␊ |
| 26 | #include <stdbool.h>␊ |
| 27 | #include <mach/mach.h>␊ |
| 28 | #include <mach/mach_error.h>␊ |
| 29 | #include <sys/file.h>␊ |
| 30 | #include <mach-o/loader.h>␊ |
| 31 | #include <libkern/OSByteOrder.h>␊ |
| 32 | #include <unistd.h>␊ |
| 33 | ␊ |
| 34 | int␉infile, outfile;␊ |
| 35 | ␊ |
| 36 | struct mach_header␉mh;␊ |
| 37 | void *␉␉cmds;␊ |
| 38 | ␊ |
| 39 | static bool␉swap_ends;␊ |
| 40 | ␊ |
| 41 | static unsigned long swap(unsigned long x)␊ |
| 42 | {␊ |
| 43 | if (swap_ends)␊ |
| 44 | ␉return OSSwapInt32(x);␊ |
| 45 | else␊ |
| 46 | ␉return x;␊ |
| 47 | }␊ |
| 48 | ␊ |
| 49 | int␊ |
| 50 | main(int argc, char *argv[])␊ |
| 51 | {␊ |
| 52 | kern_return_t␉result;␊ |
| 53 | vm_address_t␉data;␊ |
| 54 | int␉␉␉nc, ncmds;␊ |
| 55 | char *␉␉cp;␊ |
| 56 | ␊ |
| 57 | if (argc == 2) {␊ |
| 58 | ␉infile = open(argv[1], O_RDONLY);␊ |
| 59 | ␉if (infile < 0)␊ |
| 60 | ␉ goto usage;␊ |
| 61 | ␉outfile = fileno(stdout);␊ |
| 62 | }␊ |
| 63 | else if (argc == 3) {␊ |
| 64 | ␉infile = open(argv[1], O_RDONLY);␊ |
| 65 | ␉if (infile < 0)␊ |
| 66 | ␉ goto usage;␊ |
| 67 | ␉outfile = open(argv[2], O_WRONLY|O_CREAT|O_TRUNC, 0644);␊ |
| 68 | ␉if (outfile < 0)␊ |
| 69 | ␉ goto usage;␊ |
| 70 | }␊ |
| 71 | else {␊ |
| 72 | usage:␊ |
| 73 | ␉fprintf(stderr, "usage: machOconv inputfile [outputfile]\n");␊ |
| 74 | ␉exit(1);␊ |
| 75 | }␊ |
| 76 | ␊ |
| 77 | nc = read(infile, &mh, sizeof (mh));␊ |
| 78 | if (nc < 0) {␊ |
| 79 | ␉perror("read mach header");␊ |
| 80 | ␉exit(1);␊ |
| 81 | }␊ |
| 82 | if (nc < (int)sizeof (mh)) {␊ |
| 83 | ␉fprintf(stderr, "read mach header: premature EOF %d\n", nc);␊ |
| 84 | ␉exit(1);␊ |
| 85 | }␊ |
| 86 | if (mh.magic == MH_MAGIC)␊ |
| 87 | ␉swap_ends = false;␊ |
| 88 | else if (mh.magic == MH_CIGAM)␊ |
| 89 | ␉swap_ends = true;␊ |
| 90 | else {␊ |
| 91 | ␉fprintf(stderr, "bad magic number %lx\n", (unsigned long)mh.magic);␊ |
| 92 | ␉exit(1);␊ |
| 93 | }␊ |
| 94 | ␊ |
| 95 | cmds = calloc(swap(mh.sizeofcmds), sizeof (char));␊ |
| 96 | if (cmds == 0) {␊ |
| 97 | ␉fprintf(stderr, "alloc load commands: no memory\n");␊ |
| 98 | ␉exit(1);␊ |
| 99 | }␊ |
| 100 | nc = read(infile, cmds, swap(mh.sizeofcmds));␊ |
| 101 | if (nc < 0) {␊ |
| 102 | ␉perror("read load commands");␊ |
| 103 | ␉exit(1);␊ |
| 104 | }␊ |
| 105 | if (nc < (int)swap(mh.sizeofcmds)) {␊ |
| 106 | ␉fprintf(stderr, "read load commands: premature EOF %d\n", nc);␊ |
| 107 | ␉exit(1);␊ |
| 108 | }␊ |
| 109 | ␊ |
| 110 | ␉unsigned long vmstart = (unsigned long)-1;␊ |
| 111 | ␊ |
| 112 | ␉// First pass: determine actual load address␊ |
| 113 | ␉for (ncmds = swap(mh.ncmds), cp = cmds;␊ |
| 114 | ␉␉ ncmds > 0; ncmds--)␊ |
| 115 | ␉{␊ |
| 116 | #define lcp␉((struct load_command *)cp)␊ |
| 117 | #define scp␉((struct segment_command *)cp)␊ |
| 118 | ␊ |
| 119 | ␉␉switch(swap(lcp->cmd))␊ |
| 120 | ␉␉{␊ |
| 121 | ␉␉␉case LC_SEGMENT:␊ |
| 122 | ␉␉␉␉if(vmstart > swap(scp->vmaddr)) ␊ |
| 123 | ␉␉␉␉{␊ |
| 124 | ␉␉␉␉␉vmstart = swap(scp->vmaddr);␊ |
| 125 | ␉␉␉␉}␊ |
| 126 | ␉␉}␊ |
| 127 | ␉␉cp += swap(lcp->cmdsize);␊ |
| 128 | ␊ |
| 129 | ␉}␊ |
| 130 | ␊ |
| 131 | ␉// Second pass: output to file.␊ |
| 132 | ␉for (ncmds = swap(mh.ncmds), cp = cmds;␊ |
| 133 | ␉␉ ncmds > 0; ncmds--)␊ |
| 134 | ␉{␊ |
| 135 | #define lcp␉((struct load_command *)cp)␊ |
| 136 | #define scp␉((struct segment_command *)cp)␊ |
| 137 | ␊ |
| 138 | ␉ bool␉isDATA;␊ |
| 139 | ␉ unsigned␉vmsize;␊ |
| 140 | ␊ |
| 141 | ␉␉switch(swap(lcp->cmd))␊ |
| 142 | ␉␉{␊ |
| 143 | ␉␉␉case LC_SEGMENT:␊ |
| 144 | ␉␉␉␉isDATA = (strcmp(scp->segname, "__DATA") == 0);␊ |
| 145 | ␉␉␉␉if (isDATA)␊ |
| 146 | ␉␉␉␉{␊ |
| 147 | ␉␉␉␉␉vmsize = swap(scp->filesize);␊ |
| 148 | ␉␉␉␉}␊ |
| 149 | ␉␉␉␉else␊ |
| 150 | ␉␉␉␉{␊ |
| 151 | ␉␉␉␉␉vmsize = swap(scp->vmsize);␊ |
| 152 | ␉␉␉␉}␊ |
| 153 | ␊ |
| 154 | ␉␉␉␉result = vm_allocate(mach_task_self(), &data, vmsize, true);␊ |
| 155 | ␉␉␉␉if (result != KERN_SUCCESS)␊ |
| 156 | ␉␉␉␉{␊ |
| 157 | ␉␉␉␉␉mach_error("vm_allocate segment data", result);␊ |
| 158 | ␉␉␉␉␉exit(1);␊ |
| 159 | ␉␉␉␉}␊ |
| 160 | ␊ |
| 161 | ␉␉␉␉lseek(infile, swap(scp->fileoff), L_SET);␊ |
| 162 | ␉␉␉␉nc = read(infile, (void *)data, swap(scp->filesize));␊ |
| 163 | ␉␉␉␉if (nc < 0) {␊ |
| 164 | ␉␉␉␉␉perror("read segment data");␊ |
| 165 | ␉␉␉␉␉exit(1);␊ |
| 166 | ␉␉␉␉}␊ |
| 167 | ␉␉␉␉if (nc < (int)swap(scp->filesize))␊ |
| 168 | ␉␉␉␉{␊ |
| 169 | ␉␉␉␉␉fprintf(stderr, "read segment data: premature EOF %d\n", nc);␊ |
| 170 | ␉␉␉␉␉exit(1);␊ |
| 171 | ␉␉␉␉}␊ |
| 172 | ␊ |
| 173 | ␉␉␉␉lseek(outfile, swap(scp->vmaddr) - vmstart, L_SET);␊ |
| 174 | ␉␉␉␉nc = write(outfile, (void *)data, vmsize);␊ |
| 175 | ␉␉␉␉if (nc < (int)vmsize)␊ |
| 176 | ␉␉␉␉{␊ |
| 177 | ␉␉␉␉␉perror("write segment data");␊ |
| 178 | ␉␉␉␉␉exit(1);␊ |
| 179 | ␉␉␉␉}␊ |
| 180 | ␊ |
| 181 | ␉␉␉␉vm_deallocate(mach_task_self(), data, vmsize);␊ |
| 182 | ␉␉␉␉break;␊ |
| 183 | ␉␉}␊ |
| 184 | ␊ |
| 185 | ␉␉cp += swap(lcp->cmdsize);␊ |
| 186 | ␉}␊ |
| 187 | ␉␊ |
| 188 | ␉exit(0);␊ |
| 189 | }␊ |
| 190 | |
