1 /*
2 * QEMU Executable loader
3 *
4 * Copyright (c) 2006 Fabrice Bellard
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 *
24 * Gunzip functionality in this file is derived from u-boot:
25 *
26 * (C) Copyright 2008 Semihalf
27 *
28 * (C) Copyright 2000-2005
29 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
30 *
31 * This program is free software; you can redistribute it and/or
32 * modify it under the terms of the GNU General Public License as
33 * published by the Free Software Foundation; either version 2 of
34 * the License, or (at your option) any later version.
35 *
36 * This program is distributed in the hope that it will be useful,
37 * but WITHOUT ANY WARRANTY; without even the implied warranty of
38 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
39 * GNU General Public License for more details.
40 *
41 * You should have received a copy of the GNU General Public License along
42 * with this program; if not, write to the Free Software Foundation, Inc.,
43 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
44 */
45
46 #include "qemu-common.h"
47 #include "disas.h"
48 #include "sysemu.h"
49 #include "uboot_image.h"
50
51 #include <zlib.h>
52
53 /* return the size or -1 if error */
get_image_size(const char * filename)54 int get_image_size(const char *filename)
55 {
56 int fd, size;
57 fd = open(filename, O_RDONLY | O_BINARY);
58 if (fd < 0)
59 return -1;
60 size = lseek(fd, 0, SEEK_END);
61 close(fd);
62 return size;
63 }
64
65 /* return the size or -1 if error */
66 /* deprecated, because caller does not specify buffer size! */
load_image(const char * filename,uint8_t * addr)67 int load_image(const char *filename, uint8_t *addr)
68 {
69 int fd, size;
70 fd = open(filename, O_RDONLY | O_BINARY);
71 if (fd < 0)
72 return -1;
73 size = lseek(fd, 0, SEEK_END);
74 lseek(fd, 0, SEEK_SET);
75 if (read(fd, addr, size) != size) {
76 close(fd);
77 return -1;
78 }
79 close(fd);
80 return size;
81 }
82
83 /* return the amount read, just like fread. 0 may mean error or eof */
fread_targphys(target_phys_addr_t dst_addr,size_t nbytes,FILE * f)84 int fread_targphys(target_phys_addr_t dst_addr, size_t nbytes, FILE *f)
85 {
86 uint8_t buf[4096];
87 target_phys_addr_t dst_begin = dst_addr;
88 size_t want, did;
89
90 while (nbytes) {
91 want = nbytes > sizeof(buf) ? sizeof(buf) : nbytes;
92 did = fread(buf, 1, want, f);
93
94 cpu_physical_memory_write_rom(dst_addr, buf, did);
95 dst_addr += did;
96 nbytes -= did;
97 if (did != want)
98 break;
99 }
100 return dst_addr - dst_begin;
101 }
102
103 /* returns 0 on error, 1 if ok */
fread_targphys_ok(target_phys_addr_t dst_addr,size_t nbytes,FILE * f)104 int fread_targphys_ok(target_phys_addr_t dst_addr, size_t nbytes, FILE *f)
105 {
106 return fread_targphys(dst_addr, nbytes, f) == nbytes;
107 }
108
109 /* read()-like version */
read_targphys(int fd,target_phys_addr_t dst_addr,size_t nbytes)110 int read_targphys(int fd, target_phys_addr_t dst_addr, size_t nbytes)
111 {
112 uint8_t buf[4096];
113 target_phys_addr_t dst_begin = dst_addr;
114 size_t want, did;
115
116 while (nbytes) {
117 want = nbytes > sizeof(buf) ? sizeof(buf) : nbytes;
118 did = read(fd, buf, want);
119 if (did != want) break;
120
121 cpu_physical_memory_write_rom(dst_addr, buf, did);
122 dst_addr += did;
123 nbytes -= did;
124 }
125 return dst_addr - dst_begin;
126 }
127
128 /* return the size or -1 if error */
load_image_targphys(const char * filename,target_phys_addr_t addr,int max_sz)129 int load_image_targphys(const char *filename,
130 target_phys_addr_t addr, int max_sz)
131 {
132 FILE *f;
133 size_t got;
134
135 f = fopen(filename, "rb");
136 if (!f) return -1;
137
138 got = fread_targphys(addr, max_sz, f);
139 if (ferror(f)) { fclose(f); return -1; }
140 fclose(f);
141
142 return got;
143 }
144
pstrcpy_targphys(target_phys_addr_t dest,int buf_size,const char * source)145 void pstrcpy_targphys(target_phys_addr_t dest, int buf_size,
146 const char *source)
147 {
148 static const uint8_t nul_byte = 0;
149 const char *nulp;
150
151 if (buf_size <= 0) return;
152 nulp = memchr(source, 0, buf_size);
153 if (nulp) {
154 cpu_physical_memory_write_rom(dest, (uint8_t *)source,
155 (nulp - source) + 1);
156 } else {
157 cpu_physical_memory_write_rom(dest, (uint8_t *)source, buf_size - 1);
158 cpu_physical_memory_write_rom(dest, &nul_byte, 1);
159 }
160 }
161
162 /* A.OUT loader */
163
164 struct exec
165 {
166 uint32_t a_info; /* Use macros N_MAGIC, etc for access */
167 uint32_t a_text; /* length of text, in bytes */
168 uint32_t a_data; /* length of data, in bytes */
169 uint32_t a_bss; /* length of uninitialized data area, in bytes */
170 uint32_t a_syms; /* length of symbol table data in file, in bytes */
171 uint32_t a_entry; /* start address */
172 uint32_t a_trsize; /* length of relocation info for text, in bytes */
173 uint32_t a_drsize; /* length of relocation info for data, in bytes */
174 };
175
176 #ifdef BSWAP_NEEDED
bswap_ahdr(struct exec * e)177 static void bswap_ahdr(struct exec *e)
178 {
179 bswap32s(&e->a_info);
180 bswap32s(&e->a_text);
181 bswap32s(&e->a_data);
182 bswap32s(&e->a_bss);
183 bswap32s(&e->a_syms);
184 bswap32s(&e->a_entry);
185 bswap32s(&e->a_trsize);
186 bswap32s(&e->a_drsize);
187 }
188 #else
189 #define bswap_ahdr(x) do { } while (0)
190 #endif
191
192 #define N_MAGIC(exec) ((exec).a_info & 0xffff)
193 #define OMAGIC 0407
194 #define NMAGIC 0410
195 #define ZMAGIC 0413
196 #define QMAGIC 0314
197 #define _N_HDROFF(x) (1024 - sizeof (struct exec))
198 #define N_TXTOFF(x) \
199 (N_MAGIC(x) == ZMAGIC ? _N_HDROFF((x)) + sizeof (struct exec) : \
200 (N_MAGIC(x) == QMAGIC ? 0 : sizeof (struct exec)))
201 #define N_TXTADDR(x) (N_MAGIC(x) == QMAGIC ? TARGET_PAGE_SIZE : 0)
202 #define _N_SEGMENT_ROUND(x) (((x) + TARGET_PAGE_SIZE - 1) & ~(TARGET_PAGE_SIZE - 1))
203
204 #define _N_TXTENDADDR(x) (N_TXTADDR(x)+(x).a_text)
205
206 #define N_DATADDR(x) \
207 (N_MAGIC(x)==OMAGIC? (_N_TXTENDADDR(x)) \
208 : (_N_SEGMENT_ROUND (_N_TXTENDADDR(x))))
209
210
load_aout(const char * filename,target_phys_addr_t addr,int max_sz)211 int load_aout(const char *filename, target_phys_addr_t addr, int max_sz)
212 {
213 int fd, size, ret;
214 struct exec e;
215 uint32_t magic;
216
217 fd = open(filename, O_RDONLY | O_BINARY);
218 if (fd < 0)
219 return -1;
220
221 size = read(fd, &e, sizeof(e));
222 if (size < 0)
223 goto fail;
224
225 bswap_ahdr(&e);
226
227 magic = N_MAGIC(e);
228 switch (magic) {
229 case ZMAGIC:
230 case QMAGIC:
231 case OMAGIC:
232 if (e.a_text + e.a_data > max_sz)
233 goto fail;
234 lseek(fd, N_TXTOFF(e), SEEK_SET);
235 size = read_targphys(fd, addr, e.a_text + e.a_data);
236 if (size < 0)
237 goto fail;
238 break;
239 case NMAGIC:
240 if (N_DATADDR(e) + e.a_data > max_sz)
241 goto fail;
242 lseek(fd, N_TXTOFF(e), SEEK_SET);
243 size = read_targphys(fd, addr, e.a_text);
244 if (size < 0)
245 goto fail;
246 ret = read_targphys(fd, addr + N_DATADDR(e), e.a_data);
247 if (ret < 0)
248 goto fail;
249 size += ret;
250 break;
251 default:
252 goto fail;
253 }
254 close(fd);
255 return size;
256 fail:
257 close(fd);
258 return -1;
259 }
260
261 /* ELF loader */
262
load_at(int fd,int offset,int size)263 static void *load_at(int fd, int offset, int size)
264 {
265 void *ptr;
266 if (lseek(fd, offset, SEEK_SET) < 0)
267 return NULL;
268 ptr = qemu_malloc(size);
269 if (read(fd, ptr, size) != size) {
270 qemu_free(ptr);
271 return NULL;
272 }
273 return ptr;
274 }
275
276
277 #define ELF_CLASS ELFCLASS32
278 #include "elf.h"
279
280 #define SZ 32
281 #define elf_word uint32_t
282 #define elf_sword int32_t
283 #define bswapSZs bswap32s
284 #include "elf_ops.h"
285
286 #undef elfhdr
287 #undef elf_phdr
288 #undef elf_shdr
289 #undef elf_sym
290 #undef elf_note
291 #undef elf_word
292 #undef elf_sword
293 #undef bswapSZs
294 #undef SZ
295 #define elfhdr elf64_hdr
296 #define elf_phdr elf64_phdr
297 #define elf_note elf64_note
298 #define elf_shdr elf64_shdr
299 #define elf_sym elf64_sym
300 #define elf_word uint64_t
301 #define elf_sword int64_t
302 #define bswapSZs bswap64s
303 #define SZ 64
304 #include "elf_ops.h"
305
306 /* return < 0 if error, otherwise the number of bytes loaded in memory */
load_elf(const char * filename,int64_t address_offset,uint64_t * pentry,uint64_t * lowaddr,uint64_t * highaddr)307 int load_elf(const char *filename, int64_t address_offset,
308 uint64_t *pentry, uint64_t *lowaddr, uint64_t *highaddr)
309 {
310 int fd, data_order, host_data_order, must_swab, ret;
311 uint8_t e_ident[EI_NIDENT];
312
313 fd = open(filename, O_RDONLY | O_BINARY);
314 if (fd < 0) {
315 perror(filename);
316 return -1;
317 }
318 if (read(fd, e_ident, sizeof(e_ident)) != sizeof(e_ident))
319 goto fail;
320 if (e_ident[0] != ELFMAG0 ||
321 e_ident[1] != ELFMAG1 ||
322 e_ident[2] != ELFMAG2 ||
323 e_ident[3] != ELFMAG3)
324 goto fail;
325 #ifdef HOST_WORDS_BIGENDIAN
326 data_order = ELFDATA2MSB;
327 #else
328 data_order = ELFDATA2LSB;
329 #endif
330 must_swab = data_order != e_ident[EI_DATA];
331
332 #ifdef TARGET_WORDS_BIGENDIAN
333 host_data_order = ELFDATA2MSB;
334 #else
335 host_data_order = ELFDATA2LSB;
336 #endif
337 if (host_data_order != e_ident[EI_DATA])
338 return -1;
339
340 lseek(fd, 0, SEEK_SET);
341 if (e_ident[EI_CLASS] == ELFCLASS64) {
342 ret = load_elf64(fd, address_offset, must_swab, pentry,
343 lowaddr, highaddr);
344 } else {
345 ret = load_elf32(fd, address_offset, must_swab, pentry,
346 lowaddr, highaddr);
347 }
348
349 close(fd);
350 return ret;
351
352 fail:
353 close(fd);
354 return -1;
355 }
356
bswap_uboot_header(uboot_image_header_t * hdr)357 static void bswap_uboot_header(uboot_image_header_t *hdr)
358 {
359 #ifndef HOST_WORDS_BIGENDIAN
360 bswap32s(&hdr->ih_magic);
361 bswap32s(&hdr->ih_hcrc);
362 bswap32s(&hdr->ih_time);
363 bswap32s(&hdr->ih_size);
364 bswap32s(&hdr->ih_load);
365 bswap32s(&hdr->ih_ep);
366 bswap32s(&hdr->ih_dcrc);
367 #endif
368 }
369
370
371 #define ZALLOC_ALIGNMENT 16
372
zalloc(void * x,unsigned items,unsigned size)373 static void *zalloc(void *x, unsigned items, unsigned size)
374 {
375 void *p;
376
377 size *= items;
378 size = (size + ZALLOC_ALIGNMENT - 1) & ~(ZALLOC_ALIGNMENT - 1);
379
380 p = qemu_malloc(size);
381
382 return (p);
383 }
384
zfree(void * x,void * addr)385 static void zfree(void *x, void *addr)
386 {
387 qemu_free(addr);
388 }
389
390
391 #define HEAD_CRC 2
392 #define EXTRA_FIELD 4
393 #define ORIG_NAME 8
394 #define COMMENT 0x10
395 #define RESERVED 0xe0
396
397 #define DEFLATED 8
398
399 /* This is the maximum in uboot, so if a uImage overflows this, it would
400 * overflow on real hardware too. */
401 #define UBOOT_MAX_GUNZIP_BYTES 0x800000
402
gunzip(void * dst,size_t dstlen,uint8_t * src,size_t srclen)403 static ssize_t gunzip(void *dst, size_t dstlen, uint8_t *src,
404 size_t srclen)
405 {
406 z_stream s;
407 ssize_t dstbytes;
408 int r, i, flags;
409
410 /* skip header */
411 i = 10;
412 flags = src[3];
413 if (src[2] != DEFLATED || (flags & RESERVED) != 0) {
414 puts ("Error: Bad gzipped data\n");
415 return -1;
416 }
417 if ((flags & EXTRA_FIELD) != 0)
418 i = 12 + src[10] + (src[11] << 8);
419 if ((flags & ORIG_NAME) != 0)
420 while (src[i++] != 0)
421 ;
422 if ((flags & COMMENT) != 0)
423 while (src[i++] != 0)
424 ;
425 if ((flags & HEAD_CRC) != 0)
426 i += 2;
427 if (i >= srclen) {
428 puts ("Error: gunzip out of data in header\n");
429 return -1;
430 }
431
432 s.zalloc = zalloc;
433 s.zfree = zfree;
434
435 r = inflateInit2(&s, -MAX_WBITS);
436 if (r != Z_OK) {
437 printf ("Error: inflateInit2() returned %d\n", r);
438 return (-1);
439 }
440 s.next_in = src + i;
441 s.avail_in = srclen - i;
442 s.next_out = dst;
443 s.avail_out = dstlen;
444 r = inflate(&s, Z_FINISH);
445 if (r != Z_OK && r != Z_STREAM_END) {
446 printf ("Error: inflate() returned %d\n", r);
447 return -1;
448 }
449 dstbytes = s.next_out - (unsigned char *) dst;
450 inflateEnd(&s);
451
452 return dstbytes;
453 }
454
455 /* Load a U-Boot image. */
load_uimage(const char * filename,target_ulong * ep,target_ulong * loadaddr,int * is_linux)456 int load_uimage(const char *filename, target_ulong *ep, target_ulong *loadaddr,
457 int *is_linux)
458 {
459 int fd;
460 int size;
461 uboot_image_header_t h;
462 uboot_image_header_t *hdr = &h;
463 uint8_t *data = NULL;
464 int ret = -1;
465
466 fd = open(filename, O_RDONLY | O_BINARY);
467 if (fd < 0)
468 return -1;
469
470 size = read(fd, hdr, sizeof(uboot_image_header_t));
471 if (size < 0)
472 goto out;
473
474 bswap_uboot_header(hdr);
475
476 if (hdr->ih_magic != IH_MAGIC)
477 goto out;
478
479 /* TODO: Implement other image types. */
480 if (hdr->ih_type != IH_TYPE_KERNEL) {
481 fprintf(stderr, "Can only load u-boot image type \"kernel\"\n");
482 goto out;
483 }
484
485 switch (hdr->ih_comp) {
486 case IH_COMP_NONE:
487 case IH_COMP_GZIP:
488 break;
489 default:
490 fprintf(stderr,
491 "Unable to load u-boot images with compression type %d\n",
492 hdr->ih_comp);
493 goto out;
494 }
495
496 /* TODO: Check CPU type. */
497 if (is_linux) {
498 if (hdr->ih_os == IH_OS_LINUX)
499 *is_linux = 1;
500 else
501 *is_linux = 0;
502 }
503
504 *ep = hdr->ih_ep;
505 data = qemu_malloc(hdr->ih_size);
506
507 if (read(fd, data, hdr->ih_size) != hdr->ih_size) {
508 fprintf(stderr, "Error reading file\n");
509 goto out;
510 }
511
512 if (hdr->ih_comp == IH_COMP_GZIP) {
513 uint8_t *compressed_data;
514 size_t max_bytes;
515 ssize_t bytes;
516
517 compressed_data = data;
518 max_bytes = UBOOT_MAX_GUNZIP_BYTES;
519 data = qemu_malloc(max_bytes);
520
521 bytes = gunzip(data, max_bytes, compressed_data, hdr->ih_size);
522 qemu_free(compressed_data);
523 if (bytes < 0) {
524 fprintf(stderr, "Unable to decompress gzipped image!\n");
525 goto out;
526 }
527 hdr->ih_size = bytes;
528 }
529
530 cpu_physical_memory_write_rom(hdr->ih_load, data, hdr->ih_size);
531
532 if (loadaddr)
533 *loadaddr = hdr->ih_load;
534
535 ret = hdr->ih_size;
536
537 out:
538 if (data)
539 qemu_free(data);
540 close(fd);
541 return ret;
542 }
543