Ronald G. Minnich | 5d01ec0 | 2009-03-31 11:57:36 +0000 | [diff] [blame] | 1 | /* |
Peter Stuge | 45ae92ff | 2009-04-14 19:48:32 +0000 | [diff] [blame] | 2 | * cbfs-mkstage |
Ronald G. Minnich | 5d01ec0 | 2009-03-31 11:57:36 +0000 | [diff] [blame] | 3 | * |
| 4 | * Copyright (C) 2008 Jordan Crouse <jordan@cosmicpenguin.net> |
Patrick Georgi | b7b56dd8 | 2009-09-14 13:29:27 +0000 | [diff] [blame] | 5 | * 2009 coresystems GmbH |
| 6 | * written by Patrick Georgi <patrick.georgi@coresystems.de> |
David Hendricks | 90ca3b6 | 2012-11-16 14:48:22 -0800 | [diff] [blame] | 7 | * Copyright (C) 2012 Google, Inc. |
Ronald G. Minnich | 5d01ec0 | 2009-03-31 11:57:36 +0000 | [diff] [blame] | 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; version 2 of the License. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA |
| 21 | */ |
| 22 | |
| 23 | #include <stdio.h> |
| 24 | #include <stdlib.h> |
| 25 | #include <string.h> |
Ronald G. Minnich | 5d01ec0 | 2009-03-31 11:57:36 +0000 | [diff] [blame] | 26 | |
| 27 | #include "common.h" |
Patrick Georgi | b7b56dd8 | 2009-09-14 13:29:27 +0000 | [diff] [blame] | 28 | #include "cbfs.h" |
Hung-Te Lin | 4505ceb | 2013-01-28 22:40:10 +0800 | [diff] [blame] | 29 | #include "elf.h" |
Ronald G. Minnich | 5d01ec0 | 2009-03-31 11:57:36 +0000 | [diff] [blame] | 30 | |
Ronald G. Minnich | aa2f739 | 2013-12-03 11:13:35 -0800 | [diff] [blame^] | 31 | /* |
| 32 | * Short form: this is complicated, but we've tried making it simple |
| 33 | * and we keep hitting problems with our ELF parsing. |
| 34 | * |
| 35 | * The ELF parsing situation has always been a bit tricky. In fact, |
| 36 | * we (and most others) have been getting it wrong in small ways for |
| 37 | * years. Recently this has caused real trouble for the ARM V8 build. |
| 38 | * In this file we attempt to finally get it right for all variations |
| 39 | * of endian-ness and word size and target architectures and |
| 40 | * architectures we might get run on. Phew!. To do this we borrow a |
| 41 | * page from the FreeBSD NFS xdr model (see elf_ehdr and elf_phdr), |
| 42 | * the Plan 9 endianness functions (see xdr.c), and Go interfaces (see |
| 43 | * how we use buffer structs in this file). This ends up being a bit |
| 44 | * wordy at the lowest level, but greatly simplifies the elf parsing |
| 45 | * code and removes a common source of bugs, namely, forgetting to |
| 46 | * flip type endianness when referencing a struct member. |
| 47 | * |
| 48 | * ELF files can have four combinations of data layout: 32/64, and |
| 49 | * big/little endian. Further, to add to the fun, depending on the |
| 50 | * word size, the size of the ELF structs varies. The coreboot SELF |
| 51 | * format is simpler in theory: it's supposed to be always BE, and the |
| 52 | * various struct members allow room for growth: the entry point is |
| 53 | * always 64 bits, for example, so the size of a SELF struct is |
| 54 | * constant, regardless of target architecture word size. Hence, we |
| 55 | * need to do some transformation of the ELF files. |
| 56 | * |
| 57 | * A given architecture, realistically, only supports one of the four |
| 58 | * combinations at a time as the 'native' format. Hence, our code has |
| 59 | * been sprinkled with every variation of [nh]to[hn][sll] over the |
| 60 | * years. We've never quite gotten it all right, however, and a quick |
| 61 | * pass over this code revealed another bug. It's all worked because, |
| 62 | * until now, all the working platforms that had CBFS were 32 LE. Even then, |
| 63 | * however, bugs crept in: we recently realized that we're not |
| 64 | * transforming the entry point to big format when we store into the |
| 65 | * SELF image. |
| 66 | * |
| 67 | * The problem is essentially an XDR operation: |
| 68 | * we have something in a foreign format and need to transform it. |
| 69 | * It's most like XDR because: |
| 70 | * 1) the byte order can be wrong |
| 71 | * 2) the word size can be wrong |
| 72 | * 3) the size of elements in the stream depends on the value |
| 73 | * of other elements in the stream |
| 74 | * it's not like XDR because: |
| 75 | * 1) the byte order can be right |
| 76 | * 2) the word size can be right |
| 77 | * 3) the struct members are all on a natural alignment |
| 78 | * |
| 79 | * Hence, this new approach. To cover word size issues, we *always* |
| 80 | * transform the two structs we care about, the file header and |
| 81 | * program header, into a native struct in the 64 bit format: |
| 82 | * |
| 83 | * [32,little] -> [Elf64_Ehdr, Elf64_Phdr] |
| 84 | * [64,little] -> [Elf64_Ehdr, Elf64_Phdr] |
| 85 | * [32,big] -> [Elf64_Ehdr, Elf64_Phdr] |
| 86 | * [64,big] -> [Elf64_Ehdr, Elf64_Phdr] |
| 87 | * Then we just use those structs, and all the need for inline ntoh* goes away, |
| 88 | * as well as all the chances for error. |
| 89 | * This works because all the SELF structs have fields large enough for |
| 90 | * the largest ELF 64 struct members, and all the Elf64 struct members |
| 91 | * are at least large enough for all ELF 32 struct members. |
| 92 | * We end up with one function to do all our ELF parsing, and two functions |
| 93 | * to transform the headers. For the put case, we also have |
| 94 | * XDR functions, and hopefully we'll never again spend 5 years with the |
| 95 | * wrong endian-ness on an output value :-) |
| 96 | * This should work for all word sizes and endianness we hope to target. |
| 97 | * I *really* don't want to be here for 128 bit addresses. |
| 98 | * |
| 99 | * The parse functions are called with a pointer to an input buffer |
| 100 | * struct. One might ask: are there enough bytes in the input buffer? |
| 101 | * We know there need to be at *least* sizeof(Elf32_Ehdr) + |
| 102 | * sizeof(Elf32_Phdr) bytes. Realistically, there has to be some data |
| 103 | * too. If we start to worry, though we have not in the past, we |
| 104 | * might apply the simple test: the input buffer needs to be at least |
| 105 | * sizeof(Elf64_Ehdr) + sizeof(Elf64_Phdr) bytes because, even if it's |
| 106 | * ELF 32, there's got to be *some* data! This is not theoretically |
| 107 | * accurate but it is actually good enough in practice. It allows the |
| 108 | * header transformation code to ignore the possibility of underrun. |
| 109 | * |
| 110 | * We also must accomodate different ELF files, and hence formats, |
| 111 | * in the same cbfs invocation. We might load a 64-bit payload |
| 112 | * on a 32-bit machine; we might even have a mixed armv7/armv8 |
| 113 | * SOC or even a system with an x86/ARM! |
| 114 | * |
| 115 | * A possibly problematic (though unlikely to be so) assumption |
| 116 | * is that we expect the BIOS to remain in the lowest 32 bits |
| 117 | * of the physical address space. Since ARMV8 has standardized |
| 118 | * on that, and x86_64 also has, this seems a safe assumption. |
| 119 | * |
| 120 | * To repeat, ELF structs are different sizes because ELF struct |
| 121 | * members are different sizes, depending on values in the ELF file |
| 122 | * header. For this we use the functions defined in xdr.c, which |
| 123 | * consume bytes, convert the endianness, and advance the data pointer |
| 124 | * in the buffer struct. |
Stefan Reinauer | a1e4824 | 2011-10-21 14:24:57 -0700 | [diff] [blame] | 125 | */ |
Ronald G. Minnich | aa2f739 | 2013-12-03 11:13:35 -0800 | [diff] [blame^] | 126 | |
| 127 | /* Get the ident array, so we can figure out |
| 128 | * endian-ness, word size, and in future other useful |
| 129 | * parameters |
| 130 | */ |
| 131 | static void |
| 132 | elf_eident(struct buffer *input, Elf64_Ehdr *ehdr) |
Patrick Georgi | b203c2f | 2009-08-20 14:48:03 +0000 | [diff] [blame] | 133 | { |
Ronald G. Minnich | aa2f739 | 2013-12-03 11:13:35 -0800 | [diff] [blame^] | 134 | memmove(ehdr->e_ident, input->data, sizeof(ehdr->e_ident)); |
| 135 | input->data += sizeof(ehdr->e_ident); |
| 136 | input->size -= sizeof(ehdr->e_ident); |
Patrick Georgi | b203c2f | 2009-08-20 14:48:03 +0000 | [diff] [blame] | 137 | } |
| 138 | |
Patrick Georgi | b203c2f | 2009-08-20 14:48:03 +0000 | [diff] [blame] | 139 | |
Ronald G. Minnich | aa2f739 | 2013-12-03 11:13:35 -0800 | [diff] [blame^] | 140 | static void |
| 141 | elf_ehdr(struct buffer *input, Elf64_Ehdr *ehdr, struct xdr *xdr, int bit64) |
Ronald G. Minnich | 5d01ec0 | 2009-03-31 11:57:36 +0000 | [diff] [blame] | 142 | { |
Ronald G. Minnich | aa2f739 | 2013-12-03 11:13:35 -0800 | [diff] [blame^] | 143 | ehdr->e_type = xdr->get16(input); |
| 144 | ehdr->e_machine = xdr->get16(input); |
| 145 | ehdr->e_version = xdr->get32(input); |
| 146 | if (bit64){ |
| 147 | ehdr->e_entry = xdr->get64(input); |
| 148 | ehdr->e_phoff = xdr->get64(input); |
| 149 | ehdr->e_shoff = xdr->get64(input); |
| 150 | } else { |
| 151 | ehdr->e_entry = xdr->get32(input); |
| 152 | ehdr->e_phoff = xdr->get32(input); |
| 153 | ehdr->e_shoff = xdr->get32(input); |
| 154 | } |
| 155 | ehdr->e_flags = xdr->get32(input); |
| 156 | ehdr->e_ehsize = xdr->get16(input); |
| 157 | ehdr->e_phentsize = xdr->get16(input); |
| 158 | ehdr->e_phnum = xdr->get16(input); |
| 159 | ehdr->e_shentsize = xdr->get16(input); |
| 160 | ehdr->e_shnum = xdr->get16(input); |
| 161 | ehdr->e_shstrndx = xdr->get16(input); |
| 162 | } |
Ronald G. Minnich | 5d01ec0 | 2009-03-31 11:57:36 +0000 | [diff] [blame] | 163 | |
Ronald G. Minnich | aa2f739 | 2013-12-03 11:13:35 -0800 | [diff] [blame^] | 164 | static void |
| 165 | elf_phdr(struct buffer *pinput, Elf64_Phdr *phdr, |
| 166 | int entsize, struct xdr *xdr, int bit64) |
| 167 | { |
| 168 | /* |
| 169 | * The entsize need not be sizeof(*phdr). |
| 170 | * Hence, it is easier to keep a copy of the input, |
| 171 | * as the xdr functions may not advance the input |
| 172 | * pointer the full entsize; rather than get tricky |
| 173 | * we just advance it below. |
| 174 | */ |
| 175 | struct buffer input = *pinput; |
| 176 | if (bit64){ |
| 177 | phdr->p_type = xdr->get32(&input); |
| 178 | phdr->p_flags = xdr->get32(&input); |
| 179 | phdr->p_offset = xdr->get64(&input); |
| 180 | phdr->p_vaddr = xdr->get64(&input); |
| 181 | phdr->p_paddr = xdr->get64(&input); |
| 182 | phdr->p_filesz = xdr->get64(&input); |
| 183 | phdr->p_memsz = xdr->get64(&input); |
| 184 | phdr->p_align = xdr->get64(&input); |
| 185 | } else { |
| 186 | phdr->p_type = xdr->get32(&input); |
| 187 | phdr->p_offset = xdr->get32(&input); |
| 188 | phdr->p_vaddr = xdr->get32(&input); |
| 189 | phdr->p_paddr = xdr->get32(&input); |
| 190 | phdr->p_filesz = xdr->get32(&input); |
| 191 | phdr->p_memsz = xdr->get32(&input); |
| 192 | phdr->p_flags = xdr->get32(&input); |
| 193 | phdr->p_align = xdr->get32(&input); |
| 194 | } |
| 195 | pinput->size -= entsize; |
| 196 | pinput->data += entsize; |
| 197 | } |
| 198 | |
| 199 | /* Get the headers from the buffer. |
| 200 | * Return -1 in the event of an error. |
| 201 | */ |
| 202 | static int |
| 203 | elf_headers(const struct buffer *pinput, Elf64_Ehdr *ehdr, Elf64_Phdr **pphdr) |
| 204 | { |
Ronald G. Minnich | 5d01ec0 | 2009-03-31 11:57:36 +0000 | [diff] [blame] | 205 | int i; |
Ronald G. Minnich | aa2f739 | 2013-12-03 11:13:35 -0800 | [diff] [blame^] | 206 | struct xdr *xdr = &xdr_le; |
| 207 | int bit64 = 0; |
| 208 | struct buffer input = *(struct buffer *)pinput; |
| 209 | struct buffer phdr_buf; |
| 210 | Elf64_Phdr *phdr; |
Ronald G. Minnich | 5d01ec0 | 2009-03-31 11:57:36 +0000 | [diff] [blame] | 211 | |
Ronald G. Minnich | aa2f739 | 2013-12-03 11:13:35 -0800 | [diff] [blame^] | 212 | if (!iself((unsigned char *)pinput->data)) { |
Hung-Te Lin | 4d87d4e | 2013-01-28 14:39:43 +0800 | [diff] [blame] | 213 | ERROR("The stage file is not in ELF format!\n"); |
David Hendricks | 90ca3b6 | 2012-11-16 14:48:22 -0800 | [diff] [blame] | 214 | return -1; |
| 215 | } |
| 216 | |
Ronald G. Minnich | aa2f739 | 2013-12-03 11:13:35 -0800 | [diff] [blame^] | 217 | elf_eident(&input, ehdr); |
| 218 | bit64 = ehdr->e_ident[EI_CLASS] == ELFCLASS64; |
| 219 | /* Assume LE unless we are sure otherwise. |
| 220 | * We're not going to take on the task of |
| 221 | * fully validating the ELF file. That way |
| 222 | * lies madness. |
| 223 | */ |
| 224 | if (ehdr->e_ident[EI_DATA] == ELFDATA2MSB) |
| 225 | xdr = &xdr_be; |
| 226 | |
| 227 | elf_ehdr(&input, ehdr, xdr, bit64); |
| 228 | |
Hung-Te Lin | c13e4bf | 2013-01-29 15:22:11 +0800 | [diff] [blame] | 229 | // The tool may work in architecture-independent way. |
| 230 | if (arch != CBFS_ARCHITECTURE_UNKNOWN && |
| 231 | !((ehdr->e_machine == EM_ARM) && (arch == CBFS_ARCHITECTURE_ARMV7)) && |
David Hendricks | 90ca3b6 | 2012-11-16 14:48:22 -0800 | [diff] [blame] | 232 | !((ehdr->e_machine == EM_386) && (arch == CBFS_ARCHITECTURE_X86))) { |
Hung-Te Lin | 4d87d4e | 2013-01-28 14:39:43 +0800 | [diff] [blame] | 233 | ERROR("The stage file has the wrong architecture\n"); |
Patrick Georgi | b7b56dd8 | 2009-09-14 13:29:27 +0000 | [diff] [blame] | 234 | return -1; |
| 235 | } |
| 236 | |
Ronald G. Minnich | aa2f739 | 2013-12-03 11:13:35 -0800 | [diff] [blame^] | 237 | if (pinput->size < ehdr->e_phoff){ |
| 238 | ERROR("The program header offset is greater than " |
| 239 | "the remaining file size." |
| 240 | "%ld bytes left, program header offset is %ld \n", |
| 241 | pinput->size, ehdr->e_phoff); |
| 242 | return -1; |
Patrick Georgi | b203c2f | 2009-08-20 14:48:03 +0000 | [diff] [blame] | 243 | } |
Ronald G. Minnich | aa2f739 | 2013-12-03 11:13:35 -0800 | [diff] [blame^] | 244 | /* cons up an input buffer for the headers. |
| 245 | * Note that the program headers can be anywhere, |
| 246 | * per the ELF spec, You'd be surprised how many ELF |
| 247 | * readers miss this little detail. |
Ronald G. Minnich | 5d01ec0 | 2009-03-31 11:57:36 +0000 | [diff] [blame] | 248 | */ |
Ronald G. Minnich | aa2f739 | 2013-12-03 11:13:35 -0800 | [diff] [blame^] | 249 | phdr_buf.data = &pinput->data[ehdr->e_phoff]; |
| 250 | phdr_buf.size = ehdr->e_phentsize * ehdr->e_phnum; |
| 251 | if (phdr_buf.size > (pinput->size - ehdr->e_phoff)){ |
| 252 | ERROR("The file is not large enough for the program headers." |
| 253 | "%ld bytes left, %ld bytes of headers\n", |
| 254 | pinput->size - ehdr->e_phoff, phdr_buf.size); |
| 255 | return -1; |
| 256 | } |
| 257 | /* gather up all the phdrs. |
| 258 | * We do them all at once because there is more |
| 259 | * than one loop over all the phdrs. |
| 260 | */ |
| 261 | phdr = calloc(sizeof(*phdr), ehdr->e_phnum); |
| 262 | for (i = 0; i < ehdr->e_phnum; i++) |
| 263 | elf_phdr(&phdr_buf, &phdr[i], ehdr->e_phentsize, xdr, bit64); |
| 264 | *pphdr = phdr; |
| 265 | return 0; |
| 266 | } |
Ronald G. Minnich | 5d01ec0 | 2009-03-31 11:57:36 +0000 | [diff] [blame] | 267 | |
Ronald G. Minnich | aa2f739 | 2013-12-03 11:13:35 -0800 | [diff] [blame^] | 268 | /* returns size of result, or -1 if error. |
| 269 | * Note that, with the new code, this function |
| 270 | * works for all elf files, not just the restricted set. |
| 271 | */ |
| 272 | int parse_elf_to_stage(const struct buffer *input, struct buffer *output, |
| 273 | comp_algo algo, uint32_t *location) |
| 274 | { |
| 275 | Elf64_Phdr *phdr; |
| 276 | Elf64_Ehdr ehdr; |
| 277 | char *buffer; |
| 278 | struct buffer outheader; |
| 279 | |
| 280 | int headers; |
| 281 | int i, outlen; |
| 282 | uint32_t data_start, data_end, mem_end; |
| 283 | |
| 284 | comp_func_ptr compress = compression_function(algo); |
| 285 | if (!compress) |
| 286 | return -1; |
| 287 | |
| 288 | DEBUG("start: parse_elf_to_stage(location=0x%x)\n", *location); |
| 289 | |
| 290 | if (elf_headers(input, &ehdr, &phdr) < 0) |
| 291 | return -1; |
| 292 | |
| 293 | headers = ehdr.e_phnum; |
| 294 | |
| 295 | data_start = ~0; |
Ronald G. Minnich | 5d01ec0 | 2009-03-31 11:57:36 +0000 | [diff] [blame] | 296 | data_end = 0; |
| 297 | mem_end = 0; |
| 298 | |
| 299 | for (i = 0; i < headers; i++) { |
| 300 | unsigned int start, mend, rend; |
| 301 | |
Ronald G. Minnich | aa2f739 | 2013-12-03 11:13:35 -0800 | [diff] [blame^] | 302 | if (phdr[i].p_type != PT_LOAD) |
Ronald G. Minnich | 5d01ec0 | 2009-03-31 11:57:36 +0000 | [diff] [blame] | 303 | continue; |
| 304 | |
| 305 | /* Empty segments are never interesting */ |
Ronald G. Minnich | aa2f739 | 2013-12-03 11:13:35 -0800 | [diff] [blame^] | 306 | if (phdr[i].p_memsz == 0) |
Ronald G. Minnich | 5d01ec0 | 2009-03-31 11:57:36 +0000 | [diff] [blame] | 307 | continue; |
| 308 | |
| 309 | /* BSS */ |
| 310 | |
Ronald G. Minnich | aa2f739 | 2013-12-03 11:13:35 -0800 | [diff] [blame^] | 311 | start = phdr[i].p_paddr; |
Ronald G. Minnich | 5d01ec0 | 2009-03-31 11:57:36 +0000 | [diff] [blame] | 312 | |
Ronald G. Minnich | aa2f739 | 2013-12-03 11:13:35 -0800 | [diff] [blame^] | 313 | mend = start + phdr[i].p_memsz; |
| 314 | rend = start + phdr[i].p_filesz; |
Ronald G. Minnich | 5d01ec0 | 2009-03-31 11:57:36 +0000 | [diff] [blame] | 315 | |
| 316 | if (start < data_start) |
| 317 | data_start = start; |
| 318 | |
| 319 | if (rend > data_end) |
| 320 | data_end = rend; |
| 321 | |
| 322 | if (mend > mem_end) |
| 323 | mem_end = mend; |
| 324 | } |
| 325 | |
Patrick Georgi | 9341acd | 2009-12-23 12:52:56 +0000 | [diff] [blame] | 326 | if (data_start < *location) { |
| 327 | data_start = *location; |
| 328 | } |
| 329 | |
Patrick Georgi | a6c337d | 2010-02-03 17:56:37 +0000 | [diff] [blame] | 330 | if (data_end <= data_start) { |
Ronald G. Minnich | aa2f739 | 2013-12-03 11:13:35 -0800 | [diff] [blame^] | 331 | ERROR("data ends (%08lx) before it starts (%08lx). Make sure " |
| 332 | "the ELF file is correct and resides in ROM space.\n", |
| 333 | (unsigned long)data_end, (unsigned long)data_start); |
Patrick Georgi | a6c337d | 2010-02-03 17:56:37 +0000 | [diff] [blame] | 334 | exit(1); |
| 335 | } |
| 336 | |
Ronald G. Minnich | 5d01ec0 | 2009-03-31 11:57:36 +0000 | [diff] [blame] | 337 | /* allocate an intermediate buffer for the data */ |
| 338 | buffer = calloc(data_end - data_start, 1); |
| 339 | |
| 340 | if (buffer == NULL) { |
Hung-Te Lin | 4d87d4e | 2013-01-28 14:39:43 +0800 | [diff] [blame] | 341 | ERROR("Unable to allocate memory: %m\n"); |
Ronald G. Minnich | 5d01ec0 | 2009-03-31 11:57:36 +0000 | [diff] [blame] | 342 | return -1; |
| 343 | } |
| 344 | |
| 345 | /* Copy the file data into the buffer */ |
| 346 | |
| 347 | for (i = 0; i < headers; i++) { |
Patrick Georgi | 9341acd | 2009-12-23 12:52:56 +0000 | [diff] [blame] | 348 | unsigned int l_start, l_offset = 0; |
Ronald G. Minnich | 5d01ec0 | 2009-03-31 11:57:36 +0000 | [diff] [blame] | 349 | |
Ronald G. Minnich | aa2f739 | 2013-12-03 11:13:35 -0800 | [diff] [blame^] | 350 | if (phdr[i].p_type != PT_LOAD) |
Ronald G. Minnich | 5d01ec0 | 2009-03-31 11:57:36 +0000 | [diff] [blame] | 351 | continue; |
| 352 | |
Ronald G. Minnich | aa2f739 | 2013-12-03 11:13:35 -0800 | [diff] [blame^] | 353 | if (phdr[i].p_memsz == 0) |
Ronald G. Minnich | 5d01ec0 | 2009-03-31 11:57:36 +0000 | [diff] [blame] | 354 | continue; |
| 355 | |
Ronald G. Minnich | aa2f739 | 2013-12-03 11:13:35 -0800 | [diff] [blame^] | 356 | l_start = phdr[i].p_paddr; |
Patrick Georgi | 9341acd | 2009-12-23 12:52:56 +0000 | [diff] [blame] | 357 | if (l_start < *location) { |
| 358 | l_offset = *location - l_start; |
| 359 | l_start = *location; |
| 360 | } |
| 361 | |
Ronald G. Minnich | aa2f739 | 2013-12-03 11:13:35 -0800 | [diff] [blame^] | 362 | /* A legal ELF file can have a program header with |
| 363 | * non-zero length but zero-length file size and a |
| 364 | * non-zero offset which, added together, are > than |
| 365 | * input->size (i.e. the total file size). So we need |
| 366 | * to not even test in the case that p_filesz is zero. |
| 367 | */ |
| 368 | if (! phdr[i].p_filesz) |
| 369 | continue; |
| 370 | if (input->size < (phdr[i].p_offset + phdr[i].p_filesz)){ |
| 371 | ERROR("Underflow copying out the segment." |
| 372 | "File has %ld bytes left, segment end is %ld\n", |
| 373 | input->size, phdr[i].p_offset + phdr[i].p_filesz); |
| 374 | return -1; |
| 375 | } |
Patrick Georgi | 9341acd | 2009-12-23 12:52:56 +0000 | [diff] [blame] | 376 | memcpy(buffer + (l_start - data_start), |
Ronald G. Minnich | aa2f739 | 2013-12-03 11:13:35 -0800 | [diff] [blame^] | 377 | &input->data[phdr[i].p_offset + l_offset], |
| 378 | phdr[i].p_filesz - l_offset); |
Ronald G. Minnich | 5d01ec0 | 2009-03-31 11:57:36 +0000 | [diff] [blame] | 379 | } |
| 380 | |
| 381 | /* Now make the output buffer */ |
Ronald G. Minnich | aa2f739 | 2013-12-03 11:13:35 -0800 | [diff] [blame^] | 382 | if (buffer_create(output, sizeof(struct cbfs_stage) + data_end - data_start, |
Hung-Te Lin | c13e4bf | 2013-01-29 15:22:11 +0800 | [diff] [blame] | 383 | input->name) != 0) { |
Hung-Te Lin | 4d87d4e | 2013-01-28 14:39:43 +0800 | [diff] [blame] | 384 | ERROR("Unable to allocate memory: %m\n"); |
Paul Menzel | 2c8f81b | 2013-04-11 10:45:11 +0200 | [diff] [blame] | 385 | free(buffer); |
Ronald G. Minnich | 5d01ec0 | 2009-03-31 11:57:36 +0000 | [diff] [blame] | 386 | return -1; |
| 387 | } |
Hung-Te Lin | c13e4bf | 2013-01-29 15:22:11 +0800 | [diff] [blame] | 388 | memset(output->data, 0, output->size); |
Ronald G. Minnich | 5d01ec0 | 2009-03-31 11:57:36 +0000 | [diff] [blame] | 389 | |
Ronald G. Minnich | aa2f739 | 2013-12-03 11:13:35 -0800 | [diff] [blame^] | 390 | /* Compress the data, at which point we'll know information |
| 391 | * to fill out the header. This seems backward but it works because |
| 392 | * - the output header is a known size (not always true in many xdr's) |
| 393 | * - we do need to know the compressed output size first |
| 394 | */ |
| 395 | compress(buffer, data_end - data_start, |
| 396 | (output->data + sizeof(struct cbfs_stage)), |
| 397 | &outlen); |
Stefan Reinauer | 6321758 | 2012-10-29 16:52:36 -0700 | [diff] [blame] | 398 | free(buffer); |
| 399 | |
Ronald G. Minnich | aa2f739 | 2013-12-03 11:13:35 -0800 | [diff] [blame^] | 400 | /* Set up for output marshaling. */ |
| 401 | outheader.data = output->data; |
| 402 | outheader.size = 0; |
| 403 | /* N.B. The original plan was that SELF data was B.E. |
| 404 | * but: this is all L.E. |
| 405 | * Maybe we should just change the spec. |
| 406 | */ |
| 407 | xdr_le.put32(&outheader, algo); |
| 408 | xdr_le.put64(&outheader, ehdr.e_entry); |
| 409 | xdr_le.put64(&outheader, data_start); |
| 410 | xdr_le.put32(&outheader, outlen); |
| 411 | xdr_le.put32(&outheader, mem_end - data_start); |
| 412 | |
Patrick Georgi | b7b56dd8 | 2009-09-14 13:29:27 +0000 | [diff] [blame] | 413 | if (*location) |
| 414 | *location -= sizeof(struct cbfs_stage); |
Ronald G. Minnich | aa2f739 | 2013-12-03 11:13:35 -0800 | [diff] [blame^] | 415 | output->size = sizeof(struct cbfs_stage) + outlen; |
Hung-Te Lin | c13e4bf | 2013-01-29 15:22:11 +0800 | [diff] [blame] | 416 | return 0; |
Ronald G. Minnich | 5d01ec0 | 2009-03-31 11:57:36 +0000 | [diff] [blame] | 417 | } |