1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* 28 * Copyright (c) 2018, Joyent, Inc. 29 */ 30 31 #include <unistd.h> 32 #include <stdlib.h> 33 #include <fcntl.h> 34 #include <strings.h> 35 #include <stdio.h> 36 #include <errno.h> 37 #include <sys/types.h> 38 #include <sys/inttypes.h> 39 #include <sys/elf.h> 40 #include <sys/elf_notes.h> 41 #include <sys/mman.h> 42 #include <sys/stat.h> 43 #include <sys/statvfs.h> 44 45 static char *pname; 46 static char *fname; 47 static char *image; /* pointer to the ELF file in memory */ 48 49 #define ELFSEEK(offset) ((void *)(image + offset)) 50 51 /* 52 * Extract the PT_LOAD bits and format them into a .s 53 */ 54 static void 55 extract32(Elf32_Ehdr *eh) 56 { 57 Elf32_Phdr *phdr; 58 caddr_t allphdrs; 59 int i; 60 int c; 61 unsigned char *bytes; 62 uint_t cnt = 10; 63 64 allphdrs = NULL; 65 66 if (eh->e_type != ET_EXEC) { 67 (void) fprintf(stderr, "%s: not ET_EXEC, e_type = 0x%x\n", 68 pname, eh->e_type); 69 exit(1); 70 } 71 if (eh->e_phnum == 0 || eh->e_phoff == 0) { 72 (void) fprintf(stderr, "%s: no program headers\n", pname); 73 exit(1); 74 } 75 76 /* 77 * Get the program headers. 78 */ 79 allphdrs = ELFSEEK(eh->e_phoff); 80 if (allphdrs == NULL) { 81 (void) fprintf(stderr, "%s: Failed to get %d program hdrs\n", 82 pname, eh->e_phnum); 83 exit(1); 84 } 85 86 /* 87 * Find the PT_LOAD section 88 */ 89 for (i = 0; i < eh->e_phnum; i++) { 90 /*LINTED [ELF program header alignment]*/ 91 phdr = (Elf32_Phdr *)(allphdrs + eh->e_phentsize * i); 92 93 if (phdr->p_type != PT_LOAD) 94 continue; 95 96 if (phdr->p_memsz == 0) 97 continue; 98 99 bytes = ELFSEEK(phdr->p_offset); 100 for (c = 0; c < phdr->p_filesz; ++c) { 101 if (c % cnt == 0) 102 (void) printf("\n .byte "); 103 else 104 (void) printf(","); 105 (void) printf("0x%x", bytes[c]); 106 } 107 for (; c < phdr->p_memsz; ++c) { 108 if (c % cnt == 0) { 109 (void) printf("\n .byte "); 110 cnt = 20; 111 } else { 112 (void) printf(", "); 113 } 114 (void) printf("0"); 115 } 116 (void) printf("\n"); 117 return; 118 } 119 120 (void) fprintf(stderr, "%s: Failed finding PT_LOAD section\n", pname); 121 exit(1); 122 } 123 124 static void 125 extract64(Elf64_Ehdr *eh) 126 { 127 Elf64_Phdr *phdr; 128 caddr_t allphdrs; 129 int i; 130 int c; 131 unsigned char *bytes; 132 uint_t cnt = 10; 133 134 allphdrs = NULL; 135 136 if (eh->e_type != ET_EXEC) { 137 (void) fprintf(stderr, "%s: not ET_EXEC, e_type = 0x%x\n", 138 pname, eh->e_type); 139 exit(1); 140 } 141 if (eh->e_phnum == 0 || eh->e_phoff == 0) { 142 (void) fprintf(stderr, "%s: no program headers\n", pname); 143 exit(1); 144 } 145 146 /* 147 * Get the program headers. 148 */ 149 allphdrs = ELFSEEK(eh->e_phoff); 150 if (allphdrs == NULL) { 151 (void) fprintf(stderr, "%s: Failed to get %d program hdrs\n", 152 pname, eh->e_phnum); 153 exit(1); 154 } 155 156 /* 157 * Find the PT_LOAD section 158 */ 159 for (i = 0; i < eh->e_phnum; i++) { 160 /*LINTED [ELF program header alignment]*/ 161 phdr = (Elf64_Phdr *)(allphdrs + eh->e_phentsize * i); 162 163 if (phdr->p_type != PT_LOAD) 164 continue; 165 166 if (phdr->p_memsz == 0) 167 continue; 168 169 bytes = ELFSEEK(phdr->p_offset); 170 for (c = 0; c < phdr->p_filesz; ++c) { 171 if (c % cnt == 0) 172 (void) printf("\n .byte "); 173 else 174 (void) printf(","); 175 (void) printf("0x%x", bytes[c]); 176 } 177 for (; c < phdr->p_memsz; ++c) { 178 if (c % cnt == 0) { 179 (void) printf("\n .byte "); 180 cnt = 20; 181 } else { 182 (void) printf(", "); 183 } 184 (void) printf("0"); 185 } 186 (void) printf("\n"); 187 return; 188 } 189 190 (void) fprintf(stderr, "%s: Failed finding PT_LOAD section\n", pname); 191 exit(1); 192 } 193 194 int 195 main(int argc, char **argv) 196 { 197 int fd; 198 uchar_t *ident; 199 void *hdr = NULL; 200 struct stat stats; 201 ssize_t r; 202 size_t pgsz; 203 uint_t len; 204 205 /* 206 * we expect one argument -- the elf file 207 */ 208 if (argc != 2) { 209 (void) fprintf(stderr, "usage: %s <unix-elf-file>\n", argv[0]); 210 exit(1); 211 } 212 213 pname = strrchr(argv[0], '/'); 214 if (pname == NULL) 215 pname = argv[0]; 216 else 217 ++pname; 218 219 fname = argv[1]; 220 fd = open(fname, O_RDONLY); 221 if (fd < 0) { 222 (void) fprintf(stderr, "%s: open(%s, O_RDONLY) failed, %s\n", 223 pname, fname, strerror(errno)); 224 exit(1); 225 } 226 227 if (stat(fname, &stats) < 0) { 228 (void) fprintf(stderr, "%s: stat(%s, ...) failed, %s\n", 229 pname, fname, strerror(errno)); 230 exit(1); 231 } 232 233 pgsz = getpagesize(); 234 len = (stats.st_size + (pgsz - 1)) & (~(pgsz - 1)); 235 236 /* 237 * mmap the file 238 */ 239 image = mmap(NULL, len, PROT_READ, MAP_SHARED, fd, 0); 240 if (image == MAP_FAILED) { 241 (void) fprintf(stderr, "%s: mmap() of %s failed, %s\n", 242 pname, fname, strerror(errno)); 243 exit(1); 244 } 245 246 ident = ELFSEEK(0); 247 if (ident[EI_MAG0] != ELFMAG0 || ident[EI_MAG1] != ELFMAG1 || 248 ident[EI_MAG2] != ELFMAG2 || ident[EI_MAG3] != ELFMAG3) { 249 (void) fprintf(stderr, "%s: not an ELF file!\n", pname); 250 exit(1); 251 } 252 253 if (ident[EI_CLASS] == ELFCLASS32) { 254 hdr = ELFSEEK(0); 255 extract32(hdr); 256 } else if (ident[EI_CLASS] == ELFCLASS64) { 257 hdr = ELFSEEK(0); 258 extract64(hdr); 259 } else { 260 (void) fprintf(stderr, "%s: Wrong ELF class 0x%x\n", pname, 261 ident[EI_CLASS]); 262 exit(1); 263 } 264 return (0); 265 } 266