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e5fe0c52 PB |
1 | /****************************************************************************/ |
2 | /* | |
3 | * QEMU bFLT binary loader. Based on linux/fs/binfmt_flat.c | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
18 | * | |
19 | * Copyright (C) 2006 CodeSourcery. | |
20 | * Copyright (C) 2000-2003 David McCullough <davidm@snapgear.com> | |
21 | * Copyright (C) 2002 Greg Ungerer <gerg@snapgear.com> | |
22 | * Copyright (C) 2002 SnapGear, by Paul Dale <pauli@snapgear.com> | |
23 | * Copyright (C) 2000, 2001 Lineo, by David McCullough <davidm@lineo.com> | |
24 | * based heavily on: | |
25 | * | |
26 | * linux/fs/binfmt_aout.c: | |
27 | * Copyright (C) 1991, 1992, 1996 Linus Torvalds | |
28 | * linux/fs/binfmt_flat.c for 2.0 kernel | |
29 | * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com> | |
30 | * JAN/99 -- coded full program relocation (gerg@snapgear.com) | |
31 | */ | |
32 | ||
33 | /* ??? ZFLAT and shared library support is currently disabled. */ | |
34 | ||
35 | /****************************************************************************/ | |
36 | ||
37 | #include <stdio.h> | |
38 | #include <stdlib.h> | |
39 | #include <errno.h> | |
40 | #include <sys/mman.h> | |
41 | #include <unistd.h> | |
42 | ||
43 | #include "qemu.h" | |
44 | #include "flat.h" | |
45 | ||
46 | //#define DEBUG | |
47 | ||
48 | #ifdef DEBUG | |
49 | #define DBG_FLT(a...) printf(a) | |
50 | #else | |
51 | #define DBG_FLT(a...) | |
52 | #endif | |
53 | ||
54 | #define flat_reloc_valid(reloc, size) ((reloc) <= (size)) | |
55 | #define flat_old_ram_flag(flag) (flag) | |
56 | #ifdef TARGET_WORDS_BIGENDIAN | |
57 | #define flat_get_relocate_addr(relval) (relval) | |
58 | #else | |
59 | #define flat_get_relocate_addr(relval) bswap32(relval) | |
60 | #endif | |
61 | ||
62 | #define RELOC_FAILED 0xff00ff01 /* Relocation incorrect somewhere */ | |
63 | #define UNLOADED_LIB 0x7ff000ff /* Placeholder for unused library */ | |
64 | ||
65 | struct lib_info { | |
992f48a0 BS |
66 | abi_ulong start_code; /* Start of text segment */ |
67 | abi_ulong start_data; /* Start of data segment */ | |
68 | abi_ulong end_data; /* Start of bss section */ | |
69 | abi_ulong start_brk; /* End of data segment */ | |
70 | abi_ulong text_len; /* Length of text segment */ | |
71 | abi_ulong entry; /* Start address for this module */ | |
72 | abi_ulong build_date; /* When this one was compiled */ | |
e5fe0c52 PB |
73 | short loaded; /* Has this library been loaded? */ |
74 | }; | |
75 | ||
76 | #ifdef CONFIG_BINFMT_SHARED_FLAT | |
77 | static int load_flat_shared_library(int id, struct lib_info *p); | |
78 | #endif | |
79 | ||
80 | struct linux_binprm; | |
81 | ||
82 | #define ntohl(x) be32_to_cpu(x) | |
83 | ||
84 | /****************************************************************************/ | |
85 | /* | |
86 | * create_flat_tables() parses the env- and arg-strings in new user | |
87 | * memory and creates the pointer tables from them, and puts their | |
88 | * addresses on the "stack", returning the new stack pointer value. | |
89 | */ | |
90 | ||
91 | /* Push a block of strings onto the guest stack. */ | |
992f48a0 | 92 | static abi_ulong copy_strings(abi_ulong p, int n, char **s) |
e5fe0c52 PB |
93 | { |
94 | int len; | |
95 | ||
96 | while (n-- > 0) { | |
97 | len = strlen(s[n]) + 1; | |
98 | p -= len; | |
99 | memcpy_to_target(p, s[n], len); | |
100 | } | |
101 | ||
102 | return p; | |
103 | } | |
104 | ||
992f48a0 BS |
105 | int target_pread(int fd, abi_ulong ptr, abi_ulong len, |
106 | abi_ulong offset) | |
e5fe0c52 PB |
107 | { |
108 | void *buf; | |
109 | int ret; | |
110 | ||
579a97f7 | 111 | buf = lock_user(VERIFY_WRITE, ptr, len, 0); |
e5fe0c52 PB |
112 | ret = pread(fd, buf, len, offset); |
113 | unlock_user(buf, ptr, len); | |
114 | return ret; | |
115 | } | |
116 | /****************************************************************************/ | |
117 | ||
118 | #ifdef CONFIG_BINFMT_ZFLAT | |
119 | ||
120 | #include <linux/zlib.h> | |
121 | ||
122 | #define LBUFSIZE 4000 | |
123 | ||
124 | /* gzip flag byte */ | |
125 | #define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */ | |
126 | #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */ | |
127 | #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */ | |
128 | #define ORIG_NAME 0x08 /* bit 3 set: original file name present */ | |
129 | #define COMMENT 0x10 /* bit 4 set: file comment present */ | |
130 | #define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */ | |
131 | #define RESERVED 0xC0 /* bit 6,7: reserved */ | |
132 | ||
133 | static int decompress_exec( | |
134 | struct linux_binprm *bprm, | |
135 | unsigned long offset, | |
136 | char *dst, | |
137 | long len, | |
138 | int fd) | |
139 | { | |
140 | unsigned char *buf; | |
141 | z_stream strm; | |
142 | loff_t fpos; | |
143 | int ret, retval; | |
144 | ||
145 | DBG_FLT("decompress_exec(offset=%x,buf=%x,len=%x)\n",(int)offset, (int)dst, (int)len); | |
146 | ||
147 | memset(&strm, 0, sizeof(strm)); | |
148 | strm.workspace = kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL); | |
149 | if (strm.workspace == NULL) { | |
150 | DBG_FLT("binfmt_flat: no memory for decompress workspace\n"); | |
151 | return -ENOMEM; | |
152 | } | |
153 | buf = kmalloc(LBUFSIZE, GFP_KERNEL); | |
154 | if (buf == NULL) { | |
155 | DBG_FLT("binfmt_flat: no memory for read buffer\n"); | |
156 | retval = -ENOMEM; | |
157 | goto out_free; | |
158 | } | |
159 | ||
160 | /* Read in first chunk of data and parse gzip header. */ | |
161 | fpos = offset; | |
162 | ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos); | |
163 | ||
164 | strm.next_in = buf; | |
165 | strm.avail_in = ret; | |
166 | strm.total_in = 0; | |
167 | ||
168 | retval = -ENOEXEC; | |
169 | ||
170 | /* Check minimum size -- gzip header */ | |
171 | if (ret < 10) { | |
172 | DBG_FLT("binfmt_flat: file too small?\n"); | |
173 | goto out_free_buf; | |
174 | } | |
175 | ||
176 | /* Check gzip magic number */ | |
177 | if ((buf[0] != 037) || ((buf[1] != 0213) && (buf[1] != 0236))) { | |
178 | DBG_FLT("binfmt_flat: unknown compression magic?\n"); | |
179 | goto out_free_buf; | |
180 | } | |
181 | ||
182 | /* Check gzip method */ | |
183 | if (buf[2] != 8) { | |
184 | DBG_FLT("binfmt_flat: unknown compression method?\n"); | |
185 | goto out_free_buf; | |
186 | } | |
187 | /* Check gzip flags */ | |
188 | if ((buf[3] & ENCRYPTED) || (buf[3] & CONTINUATION) || | |
189 | (buf[3] & RESERVED)) { | |
190 | DBG_FLT("binfmt_flat: unknown flags?\n"); | |
191 | goto out_free_buf; | |
192 | } | |
193 | ||
194 | ret = 10; | |
195 | if (buf[3] & EXTRA_FIELD) { | |
196 | ret += 2 + buf[10] + (buf[11] << 8); | |
197 | if (unlikely(LBUFSIZE == ret)) { | |
198 | DBG_FLT("binfmt_flat: buffer overflow (EXTRA)?\n"); | |
199 | goto out_free_buf; | |
200 | } | |
201 | } | |
202 | if (buf[3] & ORIG_NAME) { | |
203 | for (; ret < LBUFSIZE && (buf[ret] != 0); ret++) | |
204 | ; | |
205 | if (unlikely(LBUFSIZE == ret)) { | |
206 | DBG_FLT("binfmt_flat: buffer overflow (ORIG_NAME)?\n"); | |
207 | goto out_free_buf; | |
208 | } | |
209 | } | |
210 | if (buf[3] & COMMENT) { | |
211 | for (; ret < LBUFSIZE && (buf[ret] != 0); ret++) | |
212 | ; | |
213 | if (unlikely(LBUFSIZE == ret)) { | |
214 | DBG_FLT("binfmt_flat: buffer overflow (COMMENT)?\n"); | |
215 | goto out_free_buf; | |
216 | } | |
217 | } | |
218 | ||
219 | strm.next_in += ret; | |
220 | strm.avail_in -= ret; | |
221 | ||
222 | strm.next_out = dst; | |
223 | strm.avail_out = len; | |
224 | strm.total_out = 0; | |
225 | ||
226 | if (zlib_inflateInit2(&strm, -MAX_WBITS) != Z_OK) { | |
227 | DBG_FLT("binfmt_flat: zlib init failed?\n"); | |
228 | goto out_free_buf; | |
229 | } | |
230 | ||
231 | while ((ret = zlib_inflate(&strm, Z_NO_FLUSH)) == Z_OK) { | |
232 | ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos); | |
233 | if (ret <= 0) | |
234 | break; | |
235 | if (ret >= (unsigned long) -4096) | |
236 | break; | |
237 | len -= ret; | |
238 | ||
239 | strm.next_in = buf; | |
240 | strm.avail_in = ret; | |
241 | strm.total_in = 0; | |
242 | } | |
243 | ||
244 | if (ret < 0) { | |
245 | DBG_FLT("binfmt_flat: decompression failed (%d), %s\n", | |
246 | ret, strm.msg); | |
247 | goto out_zlib; | |
248 | } | |
249 | ||
250 | retval = 0; | |
251 | out_zlib: | |
252 | zlib_inflateEnd(&strm); | |
253 | out_free_buf: | |
254 | kfree(buf); | |
255 | out_free: | |
256 | kfree(strm.workspace); | |
257 | out: | |
258 | return retval; | |
259 | } | |
260 | ||
261 | #endif /* CONFIG_BINFMT_ZFLAT */ | |
262 | ||
263 | /****************************************************************************/ | |
264 | ||
992f48a0 BS |
265 | static abi_ulong |
266 | calc_reloc(abi_ulong r, struct lib_info *p, int curid, int internalp) | |
e5fe0c52 | 267 | { |
992f48a0 | 268 | abi_ulong addr; |
e5fe0c52 | 269 | int id; |
992f48a0 BS |
270 | abi_ulong start_brk; |
271 | abi_ulong start_data; | |
272 | abi_ulong text_len; | |
273 | abi_ulong start_code; | |
e5fe0c52 PB |
274 | |
275 | #ifdef CONFIG_BINFMT_SHARED_FLAT | |
276 | #error needs checking | |
277 | if (r == 0) | |
278 | id = curid; /* Relocs of 0 are always self referring */ | |
279 | else { | |
280 | id = (r >> 24) & 0xff; /* Find ID for this reloc */ | |
281 | r &= 0x00ffffff; /* Trim ID off here */ | |
282 | } | |
283 | if (id >= MAX_SHARED_LIBS) { | |
284 | fprintf(stderr, "BINFMT_FLAT: reference 0x%x to shared library %d\n", | |
285 | (unsigned) r, id); | |
286 | goto failed; | |
287 | } | |
288 | if (curid != id) { | |
289 | if (internalp) { | |
290 | fprintf(stderr, "BINFMT_FLAT: reloc address 0x%x not " | |
291 | "in same module (%d != %d)\n", | |
292 | (unsigned) r, curid, id); | |
293 | goto failed; | |
294 | } else if ( ! p[id].loaded && | |
295 | load_flat_shared_library(id, p) > (unsigned long) -4096) { | |
296 | fprintf(stderr, "BINFMT_FLAT: failed to load library %d\n", id); | |
297 | goto failed; | |
298 | } | |
299 | /* Check versioning information (i.e. time stamps) */ | |
300 | if (p[id].build_date && p[curid].build_date | |
301 | && p[curid].build_date < p[id].build_date) { | |
302 | fprintf(stderr, "BINFMT_FLAT: library %d is younger than %d\n", | |
303 | id, curid); | |
304 | goto failed; | |
305 | } | |
306 | } | |
307 | #else | |
308 | id = 0; | |
309 | #endif | |
310 | ||
311 | start_brk = p[id].start_brk; | |
312 | start_data = p[id].start_data; | |
313 | start_code = p[id].start_code; | |
314 | text_len = p[id].text_len; | |
315 | ||
316 | if (!flat_reloc_valid(r, start_brk - start_data + text_len)) { | |
317 | fprintf(stderr, "BINFMT_FLAT: reloc outside program 0x%x " | |
318 | "(0 - 0x%x/0x%x)\n", | |
319 | (int) r,(int)(start_brk-start_code),(int)text_len); | |
320 | goto failed; | |
321 | } | |
322 | ||
323 | if (r < text_len) /* In text segment */ | |
324 | addr = r + start_code; | |
325 | else /* In data segment */ | |
326 | addr = r - text_len + start_data; | |
327 | ||
328 | /* Range checked already above so doing the range tests is redundant...*/ | |
329 | return(addr); | |
330 | ||
331 | failed: | |
332 | abort(); | |
333 | return RELOC_FAILED; | |
334 | } | |
335 | ||
336 | /****************************************************************************/ | |
337 | ||
338 | /* ??? This does not handle endianness correctly. */ | |
339 | void old_reloc(struct lib_info *libinfo, uint32_t rl) | |
340 | { | |
341 | #ifdef DEBUG | |
342 | char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" }; | |
343 | #endif | |
344 | uint32_t *ptr; | |
345 | uint32_t offset; | |
346 | int reloc_type; | |
347 | ||
348 | offset = rl & 0x3fffffff; | |
349 | reloc_type = rl >> 30; | |
350 | /* ??? How to handle this? */ | |
351 | #if defined(CONFIG_COLDFIRE) | |
352 | ptr = (uint32_t *) (libinfo->start_code + offset); | |
353 | #else | |
354 | ptr = (uint32_t *) (libinfo->start_data + offset); | |
355 | #endif | |
356 | ||
357 | #ifdef DEBUG | |
358 | fprintf(stderr, "Relocation of variable at DATASEG+%x " | |
359 | "(address %p, currently %x) into segment %s\n", | |
360 | offset, ptr, (int)*ptr, segment[reloc_type]); | |
361 | #endif | |
5fafdf24 | 362 | |
e5fe0c52 PB |
363 | switch (reloc_type) { |
364 | case OLD_FLAT_RELOC_TYPE_TEXT: | |
365 | *ptr += libinfo->start_code; | |
366 | break; | |
367 | case OLD_FLAT_RELOC_TYPE_DATA: | |
368 | *ptr += libinfo->start_data; | |
369 | break; | |
370 | case OLD_FLAT_RELOC_TYPE_BSS: | |
371 | *ptr += libinfo->end_data; | |
372 | break; | |
373 | default: | |
374 | fprintf(stderr, "BINFMT_FLAT: Unknown relocation type=%x\n", | |
375 | reloc_type); | |
376 | break; | |
377 | } | |
378 | DBG_FLT("Relocation became %x\n", (int)*ptr); | |
3b46e624 | 379 | } |
e5fe0c52 PB |
380 | |
381 | /****************************************************************************/ | |
382 | ||
383 | static int load_flat_file(struct linux_binprm * bprm, | |
992f48a0 | 384 | struct lib_info *libinfo, int id, abi_ulong *extra_stack) |
e5fe0c52 PB |
385 | { |
386 | struct flat_hdr * hdr; | |
992f48a0 BS |
387 | abi_ulong textpos = 0, datapos = 0, result; |
388 | abi_ulong realdatastart = 0; | |
389 | abi_ulong text_len, data_len, bss_len, stack_len, flags; | |
390 | abi_ulong memp = 0; /* for finding the brk area */ | |
391 | abi_ulong extra; | |
392 | abi_ulong reloc = 0, rp; | |
e5fe0c52 | 393 | int i, rev, relocs = 0; |
992f48a0 BS |
394 | abi_ulong fpos; |
395 | abi_ulong start_code, end_code; | |
396 | abi_ulong indx_len; | |
e5fe0c52 PB |
397 | |
398 | hdr = ((struct flat_hdr *) bprm->buf); /* exec-header */ | |
399 | ||
400 | text_len = ntohl(hdr->data_start); | |
401 | data_len = ntohl(hdr->data_end) - ntohl(hdr->data_start); | |
402 | bss_len = ntohl(hdr->bss_end) - ntohl(hdr->data_end); | |
403 | stack_len = ntohl(hdr->stack_size); | |
404 | if (extra_stack) { | |
405 | stack_len += *extra_stack; | |
406 | *extra_stack = stack_len; | |
407 | } | |
408 | relocs = ntohl(hdr->reloc_count); | |
409 | flags = ntohl(hdr->flags); | |
410 | rev = ntohl(hdr->rev); | |
411 | ||
412 | DBG_FLT("BINFMT_FLAT: Loading file: %s\n", bprm->filename); | |
413 | ||
414 | if (rev != FLAT_VERSION && rev != OLD_FLAT_VERSION) { | |
415 | fprintf(stderr, "BINFMT_FLAT: bad magic/rev (0x%x, need 0x%x)\n", | |
416 | rev, (int) FLAT_VERSION); | |
417 | return -ENOEXEC; | |
418 | } | |
3b46e624 | 419 | |
e5fe0c52 PB |
420 | /* Don't allow old format executables to use shared libraries */ |
421 | if (rev == OLD_FLAT_VERSION && id != 0) { | |
422 | fprintf(stderr, "BINFMT_FLAT: shared libraries are not available\n"); | |
423 | return -ENOEXEC; | |
424 | } | |
425 | ||
426 | /* | |
427 | * fix up the flags for the older format, there were all kinds | |
428 | * of endian hacks, this only works for the simple cases | |
429 | */ | |
430 | if (rev == OLD_FLAT_VERSION && flat_old_ram_flag(flags)) | |
431 | flags = FLAT_FLAG_RAM; | |
432 | ||
433 | #ifndef CONFIG_BINFMT_ZFLAT | |
434 | if (flags & (FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA)) { | |
435 | fprintf(stderr, "Support for ZFLAT executables is not enabled\n"); | |
436 | return -ENOEXEC; | |
437 | } | |
438 | #endif | |
439 | ||
440 | /* | |
441 | * calculate the extra space we need to map in | |
442 | */ | |
992f48a0 | 443 | extra = relocs * sizeof(abi_ulong); |
e5fe0c52 PB |
444 | if (extra < bss_len + stack_len) |
445 | extra = bss_len + stack_len; | |
446 | ||
2a1094cd PB |
447 | /* Add space for library base pointers. Make sure this does not |
448 | misalign the doesn't misalign the data segment. */ | |
992f48a0 BS |
449 | indx_len = MAX_SHARED_LIBS * sizeof(abi_ulong); |
450 | indx_len = (indx_len + 15) & ~(abi_ulong)15; | |
2a1094cd | 451 | |
e5fe0c52 PB |
452 | /* |
453 | * there are a couple of cases here, the separate code/data | |
454 | * case, and then the fully copied to RAM case which lumps | |
455 | * it all together. | |
456 | */ | |
457 | if ((flags & (FLAT_FLAG_RAM|FLAT_FLAG_GZIP)) == 0) { | |
458 | /* | |
459 | * this should give us a ROM ptr, but if it doesn't we don't | |
460 | * really care | |
461 | */ | |
462 | DBG_FLT("BINFMT_FLAT: ROM mapping of file (we hope)\n"); | |
463 | ||
464 | textpos = target_mmap(0, text_len, PROT_READ|PROT_EXEC, | |
465 | MAP_PRIVATE, bprm->fd, 0); | |
5fafdf24 | 466 | if (textpos == -1) { |
e5fe0c52 PB |
467 | fprintf(stderr, "Unable to mmap process text\n"); |
468 | return -1; | |
469 | } | |
470 | ||
2a1094cd | 471 | realdatastart = target_mmap(0, data_len + extra + indx_len, |
e5fe0c52 PB |
472 | PROT_READ|PROT_WRITE|PROT_EXEC, |
473 | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); | |
474 | ||
475 | if (realdatastart == -1) { | |
476 | fprintf(stderr, "Unable to allocate RAM for process data\n"); | |
477 | return realdatastart; | |
478 | } | |
2a1094cd | 479 | datapos = realdatastart + indx_len; |
e5fe0c52 PB |
480 | |
481 | DBG_FLT("BINFMT_FLAT: Allocated data+bss+stack (%d bytes): %x\n", | |
482 | (int)(data_len + bss_len + stack_len), (int)datapos); | |
483 | ||
484 | fpos = ntohl(hdr->data_start); | |
485 | #ifdef CONFIG_BINFMT_ZFLAT | |
486 | if (flags & FLAT_FLAG_GZDATA) { | |
5fafdf24 | 487 | result = decompress_exec(bprm, fpos, (char *) datapos, |
992f48a0 | 488 | data_len + (relocs * sizeof(abi_ulong))) |
e5fe0c52 PB |
489 | } else |
490 | #endif | |
491 | { | |
492 | result = target_pread(bprm->fd, datapos, | |
992f48a0 | 493 | data_len + (relocs * sizeof(abi_ulong)), |
e5fe0c52 PB |
494 | fpos); |
495 | } | |
496 | if (result < 0) { | |
497 | fprintf(stderr, "Unable to read data+bss\n"); | |
498 | return result; | |
499 | } | |
500 | ||
501 | reloc = datapos + (ntohl(hdr->reloc_start) - text_len); | |
502 | memp = realdatastart; | |
503 | ||
504 | } else { | |
505 | ||
2a1094cd | 506 | textpos = target_mmap(0, text_len + data_len + extra + indx_len, |
e5fe0c52 PB |
507 | PROT_READ | PROT_EXEC | PROT_WRITE, |
508 | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); | |
509 | if (textpos == -1 ) { | |
510 | fprintf(stderr, "Unable to allocate RAM for process text/data\n"); | |
511 | return -1; | |
512 | } | |
513 | ||
514 | realdatastart = textpos + ntohl(hdr->data_start); | |
2a1094cd PB |
515 | datapos = realdatastart + indx_len; |
516 | reloc = (textpos + ntohl(hdr->reloc_start) + indx_len); | |
e5fe0c52 PB |
517 | memp = textpos; |
518 | ||
519 | #ifdef CONFIG_BINFMT_ZFLAT | |
520 | #error code needs checking | |
521 | /* | |
522 | * load it all in and treat it like a RAM load from now on | |
523 | */ | |
524 | if (flags & FLAT_FLAG_GZIP) { | |
525 | result = decompress_exec(bprm, sizeof (struct flat_hdr), | |
526 | (((char *) textpos) + sizeof (struct flat_hdr)), | |
527 | (text_len + data_len + (relocs * sizeof(unsigned long)) | |
528 | - sizeof (struct flat_hdr)), | |
529 | 0); | |
530 | memmove((void *) datapos, (void *) realdatastart, | |
531 | data_len + (relocs * sizeof(unsigned long))); | |
532 | } else if (flags & FLAT_FLAG_GZDATA) { | |
533 | fpos = 0; | |
534 | result = bprm->file->f_op->read(bprm->file, | |
535 | (char *) textpos, text_len, &fpos); | |
536 | if (result < (unsigned long) -4096) | |
537 | result = decompress_exec(bprm, text_len, (char *) datapos, | |
538 | data_len + (relocs * sizeof(unsigned long)), 0); | |
539 | } | |
540 | else | |
541 | #endif | |
542 | { | |
543 | result = target_pread(bprm->fd, textpos, | |
544 | text_len, 0); | |
545 | if (result >= 0) { | |
546 | result = target_pread(bprm->fd, datapos, | |
992f48a0 | 547 | data_len + (relocs * sizeof(abi_ulong)), |
e5fe0c52 PB |
548 | ntohl(hdr->data_start)); |
549 | } | |
550 | } | |
551 | if (result < 0) { | |
552 | fprintf(stderr, "Unable to read code+data+bss\n"); | |
553 | return result; | |
554 | } | |
555 | } | |
556 | ||
557 | DBG_FLT("Mapping is 0x%x, Entry point is 0x%x, data_start is 0x%x\n", | |
558 | (int)textpos, 0x00ffffff&ntohl(hdr->entry), | |
559 | ntohl(hdr->data_start)); | |
560 | ||
561 | /* The main program needs a little extra setup in the task structure */ | |
562 | start_code = textpos + sizeof (struct flat_hdr); | |
563 | end_code = textpos + text_len; | |
564 | ||
565 | DBG_FLT("%s %s: TEXT=%x-%x DATA=%x-%x BSS=%x-%x\n", | |
566 | id ? "Lib" : "Load", bprm->filename, | |
567 | (int) start_code, (int) end_code, | |
568 | (int) datapos, | |
569 | (int) (datapos + data_len), | |
570 | (int) (datapos + data_len), | |
571 | (int) (((datapos + data_len + bss_len) + 3) & ~3)); | |
572 | ||
573 | text_len -= sizeof(struct flat_hdr); /* the real code len */ | |
574 | ||
575 | /* Store the current module values into the global library structure */ | |
576 | libinfo[id].start_code = start_code; | |
577 | libinfo[id].start_data = datapos; | |
578 | libinfo[id].end_data = datapos + data_len; | |
579 | libinfo[id].start_brk = datapos + data_len + bss_len; | |
580 | libinfo[id].text_len = text_len; | |
581 | libinfo[id].loaded = 1; | |
582 | libinfo[id].entry = (0x00ffffff & ntohl(hdr->entry)) + textpos; | |
583 | libinfo[id].build_date = ntohl(hdr->build_date); | |
3b46e624 | 584 | |
e5fe0c52 PB |
585 | /* |
586 | * We just load the allocations into some temporary memory to | |
587 | * help simplify all this mumbo jumbo | |
588 | * | |
589 | * We've got two different sections of relocation entries. | |
590 | * The first is the GOT which resides at the begining of the data segment | |
591 | * and is terminated with a -1. This one can be relocated in place. | |
592 | * The second is the extra relocation entries tacked after the image's | |
593 | * data segment. These require a little more processing as the entry is | |
594 | * really an offset into the image which contains an offset into the | |
595 | * image. | |
596 | */ | |
597 | if (flags & FLAT_FLAG_GOTPIC) { | |
598 | rp = datapos; | |
599 | while (1) { | |
992f48a0 | 600 | abi_ulong addr; |
2f619698 FB |
601 | if (get_user_ual(addr, rp)) |
602 | return -EFAULT; | |
e5fe0c52 PB |
603 | if (addr == -1) |
604 | break; | |
605 | if (addr) { | |
606 | addr = calc_reloc(addr, libinfo, id, 0); | |
607 | if (addr == RELOC_FAILED) | |
608 | return -ENOEXEC; | |
2f619698 FB |
609 | if (put_user_ual(addr, rp)) |
610 | return -EFAULT; | |
e5fe0c52 | 611 | } |
992f48a0 | 612 | rp += sizeof(abi_ulong); |
e5fe0c52 PB |
613 | } |
614 | } | |
615 | ||
616 | /* | |
617 | * Now run through the relocation entries. | |
618 | * We've got to be careful here as C++ produces relocatable zero | |
619 | * entries in the constructor and destructor tables which are then | |
620 | * tested for being not zero (which will always occur unless we're | |
621 | * based from address zero). This causes an endless loop as __start | |
622 | * is at zero. The solution used is to not relocate zero addresses. | |
623 | * This has the negative side effect of not allowing a global data | |
624 | * reference to be statically initialised to _stext (I've moved | |
625 | * __start to address 4 so that is okay). | |
626 | */ | |
627 | if (rev > OLD_FLAT_VERSION) { | |
628 | for (i = 0; i < relocs; i++) { | |
992f48a0 | 629 | abi_ulong addr, relval; |
e5fe0c52 PB |
630 | |
631 | /* Get the address of the pointer to be | |
632 | relocated (of course, the address has to be | |
633 | relocated first). */ | |
2f619698 FB |
634 | if (get_user_ual(relval, reloc + i * sizeof(abi_ulong))) |
635 | return -EFAULT; | |
e5fe0c52 PB |
636 | addr = flat_get_relocate_addr(relval); |
637 | rp = calc_reloc(addr, libinfo, id, 1); | |
638 | if (rp == RELOC_FAILED) | |
639 | return -ENOEXEC; | |
640 | ||
641 | /* Get the pointer's value. */ | |
2f619698 FB |
642 | if (get_user_ual(addr, rp)) |
643 | return -EFAULT; | |
e5fe0c52 PB |
644 | if (addr != 0) { |
645 | /* | |
646 | * Do the relocation. PIC relocs in the data section are | |
647 | * already in target order | |
648 | */ | |
649 | ||
650 | #ifndef TARGET_WORDS_BIGENDIAN | |
651 | if ((flags & FLAT_FLAG_GOTPIC) == 0) | |
652 | addr = bswap32(addr); | |
653 | #endif | |
654 | addr = calc_reloc(addr, libinfo, id, 0); | |
655 | if (addr == RELOC_FAILED) | |
656 | return -ENOEXEC; | |
657 | ||
658 | /* Write back the relocated pointer. */ | |
2f619698 FB |
659 | if (put_user_ual(addr, rp)) |
660 | return -EFAULT; | |
e5fe0c52 PB |
661 | } |
662 | } | |
663 | } else { | |
664 | for (i = 0; i < relocs; i++) { | |
992f48a0 | 665 | abi_ulong relval; |
2f619698 FB |
666 | if (get_user_ual(relval, reloc + i * sizeof(abi_ulong))) |
667 | return -EFAULT; | |
e5fe0c52 PB |
668 | old_reloc(&libinfo[0], relval); |
669 | } | |
670 | } | |
3b46e624 | 671 | |
e5fe0c52 PB |
672 | /* zero the BSS. */ |
673 | memset((void*)(datapos + data_len), 0, bss_len); | |
674 | ||
675 | return 0; | |
676 | } | |
677 | ||
678 | ||
679 | /****************************************************************************/ | |
680 | #ifdef CONFIG_BINFMT_SHARED_FLAT | |
681 | ||
682 | /* | |
683 | * Load a shared library into memory. The library gets its own data | |
684 | * segment (including bss) but not argv/argc/environ. | |
685 | */ | |
686 | ||
687 | static int load_flat_shared_library(int id, struct lib_info *libs) | |
688 | { | |
689 | struct linux_binprm bprm; | |
690 | int res; | |
691 | char buf[16]; | |
692 | ||
693 | /* Create the file name */ | |
694 | sprintf(buf, "/lib/lib%d.so", id); | |
695 | ||
696 | /* Open the file up */ | |
697 | bprm.filename = buf; | |
698 | bprm.file = open_exec(bprm.filename); | |
699 | res = PTR_ERR(bprm.file); | |
700 | if (IS_ERR(bprm.file)) | |
701 | return res; | |
702 | ||
703 | res = prepare_binprm(&bprm); | |
704 | ||
705 | if (res <= (unsigned long)-4096) | |
706 | res = load_flat_file(&bprm, libs, id, NULL); | |
707 | if (bprm.file) { | |
708 | allow_write_access(bprm.file); | |
709 | fput(bprm.file); | |
710 | bprm.file = NULL; | |
711 | } | |
712 | return(res); | |
713 | } | |
714 | ||
715 | #endif /* CONFIG_BINFMT_SHARED_FLAT */ | |
716 | ||
717 | int load_flt_binary(struct linux_binprm * bprm, struct target_pt_regs * regs, | |
718 | struct image_info * info) | |
719 | { | |
720 | struct lib_info libinfo[MAX_SHARED_LIBS]; | |
992f48a0 BS |
721 | abi_ulong p = bprm->p; |
722 | abi_ulong stack_len; | |
723 | abi_ulong start_addr; | |
724 | abi_ulong sp; | |
e5fe0c52 PB |
725 | int res; |
726 | int i, j; | |
727 | ||
728 | memset(libinfo, 0, sizeof(libinfo)); | |
729 | /* | |
730 | * We have to add the size of our arguments to our stack size | |
731 | * otherwise it's too easy for users to create stack overflows | |
732 | * by passing in a huge argument list. And yes, we have to be | |
733 | * pedantic and include space for the argv/envp array as it may have | |
734 | * a lot of entries. | |
735 | */ | |
736 | #define TOP_OF_ARGS (TARGET_PAGE_SIZE * MAX_ARG_PAGES - sizeof(void *)) | |
737 | stack_len = TOP_OF_ARGS - bprm->p; /* the strings */ | |
738 | stack_len += (bprm->argc + 1) * 4; /* the argv array */ | |
739 | stack_len += (bprm->envc + 1) * 4; /* the envp array */ | |
740 | ||
3b46e624 | 741 | |
e5fe0c52 PB |
742 | res = load_flat_file(bprm, libinfo, 0, &stack_len); |
743 | if (res > (unsigned long)-4096) | |
744 | return res; | |
3b46e624 | 745 | |
e5fe0c52 PB |
746 | /* Update data segment pointers for all libraries */ |
747 | for (i=0; i<MAX_SHARED_LIBS; i++) { | |
748 | if (libinfo[i].loaded) { | |
992f48a0 | 749 | abi_ulong p; |
e5fe0c52 PB |
750 | p = libinfo[i].start_data; |
751 | for (j=0; j<MAX_SHARED_LIBS; j++) { | |
752 | p -= 4; | |
2f619698 FB |
753 | /* FIXME - handle put_user() failures */ |
754 | if (put_user_ual(libinfo[j].loaded | |
755 | ? libinfo[j].start_data | |
756 | : UNLOADED_LIB, | |
757 | p)) | |
758 | return -EFAULT; | |
e5fe0c52 PB |
759 | } |
760 | } | |
761 | } | |
762 | ||
763 | p = ((libinfo[0].start_brk + stack_len + 3) & ~3) - 4; | |
764 | DBG_FLT("p=%x\n", (int)p); | |
765 | ||
766 | /* Copy argv/envp. */ | |
e5fe0c52 | 767 | p = copy_strings(p, bprm->envc, bprm->envp); |
388c4508 | 768 | p = copy_strings(p, bprm->argc, bprm->argv); |
e5fe0c52 | 769 | /* Align stack. */ |
992f48a0 | 770 | sp = p & ~(abi_ulong)(sizeof(abi_ulong) - 1); |
b35d7448 PB |
771 | /* Enforce final stack alignment of 16 bytes. This is sufficient |
772 | for all current targets, and excess alignment is harmless. */ | |
773 | stack_len = bprm->envc + bprm->argc + 2; | |
774 | stack_len += 3; /* argc, arvg, argp */ | |
992f48a0 | 775 | stack_len *= sizeof(abi_ulong); |
b35d7448 PB |
776 | if ((sp + stack_len) & 15) |
777 | sp -= 16 - ((sp + stack_len) & 15); | |
e5fe0c52 | 778 | sp = loader_build_argptr(bprm->envc, bprm->argc, sp, p, 1); |
3b46e624 | 779 | |
e5fe0c52 PB |
780 | /* Fake some return addresses to ensure the call chain will |
781 | * initialise library in order for us. We are required to call | |
782 | * lib 1 first, then 2, ... and finally the main program (id 0). | |
783 | */ | |
784 | start_addr = libinfo[0].entry; | |
785 | ||
786 | #ifdef CONFIG_BINFMT_SHARED_FLAT | |
787 | #error here | |
788 | for (i = MAX_SHARED_LIBS-1; i>0; i--) { | |
789 | if (libinfo[i].loaded) { | |
790 | /* Push previos first to call address */ | |
2f619698 FB |
791 | --sp; |
792 | if (put_user_ual(start_addr, sp)) | |
793 | return -EFAULT; | |
e5fe0c52 PB |
794 | start_addr = libinfo[i].entry; |
795 | } | |
796 | } | |
797 | #endif | |
3b46e624 | 798 | |
e5fe0c52 PB |
799 | /* Stash our initial stack pointer into the mm structure */ |
800 | info->start_code = libinfo[0].start_code; | |
801 | info->end_code = libinfo[0].start_code = libinfo[0].text_len; | |
802 | info->start_data = libinfo[0].start_data; | |
803 | info->end_data = libinfo[0].end_data; | |
804 | info->start_brk = libinfo[0].start_brk; | |
805 | info->start_stack = sp; | |
806 | info->entry = start_addr; | |
978efd6a PB |
807 | info->code_offset = info->start_code; |
808 | info->data_offset = info->start_data - libinfo[0].text_len; | |
809 | ||
e5fe0c52 PB |
810 | DBG_FLT("start_thread(entry=0x%x, start_stack=0x%x)\n", |
811 | (int)info->entry, (int)info->start_stack); | |
3b46e624 | 812 | |
e5fe0c52 PB |
813 | return 0; |
814 | } |