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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 | |
8167ee88 | 16 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
e5fe0c52 PB |
17 | * |
18 | * Copyright (C) 2006 CodeSourcery. | |
19 | * Copyright (C) 2000-2003 David McCullough <davidm@snapgear.com> | |
20 | * Copyright (C) 2002 Greg Ungerer <gerg@snapgear.com> | |
21 | * Copyright (C) 2002 SnapGear, by Paul Dale <pauli@snapgear.com> | |
22 | * Copyright (C) 2000, 2001 Lineo, by David McCullough <davidm@lineo.com> | |
23 | * based heavily on: | |
24 | * | |
25 | * linux/fs/binfmt_aout.c: | |
26 | * Copyright (C) 1991, 1992, 1996 Linus Torvalds | |
27 | * linux/fs/binfmt_flat.c for 2.0 kernel | |
28 | * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com> | |
29 | * JAN/99 -- coded full program relocation (gerg@snapgear.com) | |
30 | */ | |
31 | ||
32 | /* ??? ZFLAT and shared library support is currently disabled. */ | |
33 | ||
34 | /****************************************************************************/ | |
35 | ||
d39594e9 | 36 | #include "qemu/osdep.h" |
e5fe0c52 PB |
37 | |
38 | #include "qemu.h" | |
3b249d26 | 39 | #include "user-internals.h" |
3ad0a769 | 40 | #include "loader.h" |
5423e6d3 | 41 | #include "user-mmap.h" |
e5fe0c52 | 42 | #include "flat.h" |
94db8de1 | 43 | #include "target_flat.h" |
e5fe0c52 PB |
44 | |
45 | //#define DEBUG | |
46 | ||
47 | #ifdef DEBUG | |
001faf32 | 48 | #define DBG_FLT(...) printf(__VA_ARGS__) |
e5fe0c52 | 49 | #else |
001faf32 | 50 | #define DBG_FLT(...) |
e5fe0c52 PB |
51 | #endif |
52 | ||
e5fe0c52 PB |
53 | #define RELOC_FAILED 0xff00ff01 /* Relocation incorrect somewhere */ |
54 | #define UNLOADED_LIB 0x7ff000ff /* Placeholder for unused library */ | |
55 | ||
56 | struct lib_info { | |
992f48a0 BS |
57 | abi_ulong start_code; /* Start of text segment */ |
58 | abi_ulong start_data; /* Start of data segment */ | |
59 | abi_ulong end_data; /* Start of bss section */ | |
60 | abi_ulong start_brk; /* End of data segment */ | |
61 | abi_ulong text_len; /* Length of text segment */ | |
62 | abi_ulong entry; /* Start address for this module */ | |
63 | abi_ulong build_date; /* When this one was compiled */ | |
e5fe0c52 PB |
64 | short loaded; /* Has this library been loaded? */ |
65 | }; | |
66 | ||
67 | #ifdef CONFIG_BINFMT_SHARED_FLAT | |
68 | static int load_flat_shared_library(int id, struct lib_info *p); | |
69 | #endif | |
70 | ||
71 | struct linux_binprm; | |
72 | ||
e5fe0c52 PB |
73 | /****************************************************************************/ |
74 | /* | |
75 | * create_flat_tables() parses the env- and arg-strings in new user | |
76 | * memory and creates the pointer tables from them, and puts their | |
77 | * addresses on the "stack", returning the new stack pointer value. | |
78 | */ | |
79 | ||
80 | /* Push a block of strings onto the guest stack. */ | |
992f48a0 | 81 | static abi_ulong copy_strings(abi_ulong p, int n, char **s) |
e5fe0c52 PB |
82 | { |
83 | int len; | |
84 | ||
85 | while (n-- > 0) { | |
86 | len = strlen(s[n]) + 1; | |
87 | p -= len; | |
88 | memcpy_to_target(p, s[n], len); | |
89 | } | |
90 | ||
91 | return p; | |
92 | } | |
93 | ||
b1d8e52e BS |
94 | static int target_pread(int fd, abi_ulong ptr, abi_ulong len, |
95 | abi_ulong offset) | |
e5fe0c52 PB |
96 | { |
97 | void *buf; | |
98 | int ret; | |
99 | ||
579a97f7 | 100 | buf = lock_user(VERIFY_WRITE, ptr, len, 0); |
e5a869ed PM |
101 | if (!buf) { |
102 | return -EFAULT; | |
103 | } | |
e5fe0c52 | 104 | ret = pread(fd, buf, len, offset); |
e5a869ed PM |
105 | if (ret < 0) { |
106 | ret = -errno; | |
107 | } | |
e5fe0c52 PB |
108 | unlock_user(buf, ptr, len); |
109 | return ret; | |
110 | } | |
111 | /****************************************************************************/ | |
112 | ||
113 | #ifdef CONFIG_BINFMT_ZFLAT | |
114 | ||
115 | #include <linux/zlib.h> | |
116 | ||
117 | #define LBUFSIZE 4000 | |
118 | ||
119 | /* gzip flag byte */ | |
120 | #define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */ | |
121 | #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */ | |
122 | #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */ | |
123 | #define ORIG_NAME 0x08 /* bit 3 set: original file name present */ | |
124 | #define COMMENT 0x10 /* bit 4 set: file comment present */ | |
125 | #define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */ | |
126 | #define RESERVED 0xC0 /* bit 6,7: reserved */ | |
127 | ||
128 | static int decompress_exec( | |
129 | struct linux_binprm *bprm, | |
130 | unsigned long offset, | |
131 | char *dst, | |
132 | long len, | |
133 | int fd) | |
134 | { | |
135 | unsigned char *buf; | |
136 | z_stream strm; | |
137 | loff_t fpos; | |
138 | int ret, retval; | |
139 | ||
140 | DBG_FLT("decompress_exec(offset=%x,buf=%x,len=%x)\n",(int)offset, (int)dst, (int)len); | |
141 | ||
142 | memset(&strm, 0, sizeof(strm)); | |
143 | strm.workspace = kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL); | |
144 | if (strm.workspace == NULL) { | |
145 | DBG_FLT("binfmt_flat: no memory for decompress workspace\n"); | |
146 | return -ENOMEM; | |
147 | } | |
148 | buf = kmalloc(LBUFSIZE, GFP_KERNEL); | |
149 | if (buf == NULL) { | |
150 | DBG_FLT("binfmt_flat: no memory for read buffer\n"); | |
151 | retval = -ENOMEM; | |
152 | goto out_free; | |
153 | } | |
154 | ||
155 | /* Read in first chunk of data and parse gzip header. */ | |
156 | fpos = offset; | |
157 | ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos); | |
158 | ||
159 | strm.next_in = buf; | |
160 | strm.avail_in = ret; | |
161 | strm.total_in = 0; | |
162 | ||
163 | retval = -ENOEXEC; | |
164 | ||
165 | /* Check minimum size -- gzip header */ | |
166 | if (ret < 10) { | |
167 | DBG_FLT("binfmt_flat: file too small?\n"); | |
168 | goto out_free_buf; | |
169 | } | |
170 | ||
171 | /* Check gzip magic number */ | |
172 | if ((buf[0] != 037) || ((buf[1] != 0213) && (buf[1] != 0236))) { | |
173 | DBG_FLT("binfmt_flat: unknown compression magic?\n"); | |
174 | goto out_free_buf; | |
175 | } | |
176 | ||
177 | /* Check gzip method */ | |
178 | if (buf[2] != 8) { | |
179 | DBG_FLT("binfmt_flat: unknown compression method?\n"); | |
180 | goto out_free_buf; | |
181 | } | |
182 | /* Check gzip flags */ | |
183 | if ((buf[3] & ENCRYPTED) || (buf[3] & CONTINUATION) || | |
184 | (buf[3] & RESERVED)) { | |
185 | DBG_FLT("binfmt_flat: unknown flags?\n"); | |
186 | goto out_free_buf; | |
187 | } | |
188 | ||
189 | ret = 10; | |
190 | if (buf[3] & EXTRA_FIELD) { | |
191 | ret += 2 + buf[10] + (buf[11] << 8); | |
192 | if (unlikely(LBUFSIZE == ret)) { | |
193 | DBG_FLT("binfmt_flat: buffer overflow (EXTRA)?\n"); | |
194 | goto out_free_buf; | |
195 | } | |
196 | } | |
197 | if (buf[3] & ORIG_NAME) { | |
198 | for (; ret < LBUFSIZE && (buf[ret] != 0); ret++) | |
199 | ; | |
200 | if (unlikely(LBUFSIZE == ret)) { | |
201 | DBG_FLT("binfmt_flat: buffer overflow (ORIG_NAME)?\n"); | |
202 | goto out_free_buf; | |
203 | } | |
204 | } | |
205 | if (buf[3] & COMMENT) { | |
206 | for (; ret < LBUFSIZE && (buf[ret] != 0); ret++) | |
207 | ; | |
208 | if (unlikely(LBUFSIZE == ret)) { | |
209 | DBG_FLT("binfmt_flat: buffer overflow (COMMENT)?\n"); | |
210 | goto out_free_buf; | |
211 | } | |
212 | } | |
213 | ||
214 | strm.next_in += ret; | |
215 | strm.avail_in -= ret; | |
216 | ||
217 | strm.next_out = dst; | |
218 | strm.avail_out = len; | |
219 | strm.total_out = 0; | |
220 | ||
221 | if (zlib_inflateInit2(&strm, -MAX_WBITS) != Z_OK) { | |
222 | DBG_FLT("binfmt_flat: zlib init failed?\n"); | |
223 | goto out_free_buf; | |
224 | } | |
225 | ||
226 | while ((ret = zlib_inflate(&strm, Z_NO_FLUSH)) == Z_OK) { | |
227 | ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos); | |
228 | if (ret <= 0) | |
229 | break; | |
71987b12 | 230 | if (is_error(ret)) { |
e5fe0c52 | 231 | break; |
71987b12 | 232 | } |
e5fe0c52 PB |
233 | len -= ret; |
234 | ||
235 | strm.next_in = buf; | |
236 | strm.avail_in = ret; | |
237 | strm.total_in = 0; | |
238 | } | |
239 | ||
240 | if (ret < 0) { | |
241 | DBG_FLT("binfmt_flat: decompression failed (%d), %s\n", | |
242 | ret, strm.msg); | |
243 | goto out_zlib; | |
244 | } | |
245 | ||
246 | retval = 0; | |
247 | out_zlib: | |
248 | zlib_inflateEnd(&strm); | |
249 | out_free_buf: | |
250 | kfree(buf); | |
251 | out_free: | |
252 | kfree(strm.workspace); | |
253 | out: | |
254 | return retval; | |
255 | } | |
256 | ||
257 | #endif /* CONFIG_BINFMT_ZFLAT */ | |
258 | ||
259 | /****************************************************************************/ | |
260 | ||
992f48a0 BS |
261 | static abi_ulong |
262 | calc_reloc(abi_ulong r, struct lib_info *p, int curid, int internalp) | |
e5fe0c52 | 263 | { |
992f48a0 | 264 | abi_ulong addr; |
e5fe0c52 | 265 | int id; |
992f48a0 BS |
266 | abi_ulong start_brk; |
267 | abi_ulong start_data; | |
268 | abi_ulong text_len; | |
269 | abi_ulong start_code; | |
e5fe0c52 PB |
270 | |
271 | #ifdef CONFIG_BINFMT_SHARED_FLAT | |
272 | #error needs checking | |
273 | if (r == 0) | |
274 | id = curid; /* Relocs of 0 are always self referring */ | |
275 | else { | |
276 | id = (r >> 24) & 0xff; /* Find ID for this reloc */ | |
277 | r &= 0x00ffffff; /* Trim ID off here */ | |
278 | } | |
279 | if (id >= MAX_SHARED_LIBS) { | |
280 | fprintf(stderr, "BINFMT_FLAT: reference 0x%x to shared library %d\n", | |
281 | (unsigned) r, id); | |
282 | goto failed; | |
283 | } | |
284 | if (curid != id) { | |
285 | if (internalp) { | |
286 | fprintf(stderr, "BINFMT_FLAT: reloc address 0x%x not " | |
287 | "in same module (%d != %d)\n", | |
288 | (unsigned) r, curid, id); | |
289 | goto failed; | |
71987b12 | 290 | } else if (!p[id].loaded && is_error(load_flat_shared_library(id, p))) { |
e5fe0c52 PB |
291 | fprintf(stderr, "BINFMT_FLAT: failed to load library %d\n", id); |
292 | goto failed; | |
293 | } | |
294 | /* Check versioning information (i.e. time stamps) */ | |
295 | if (p[id].build_date && p[curid].build_date | |
296 | && p[curid].build_date < p[id].build_date) { | |
297 | fprintf(stderr, "BINFMT_FLAT: library %d is younger than %d\n", | |
298 | id, curid); | |
299 | goto failed; | |
300 | } | |
301 | } | |
302 | #else | |
303 | id = 0; | |
304 | #endif | |
305 | ||
306 | start_brk = p[id].start_brk; | |
307 | start_data = p[id].start_data; | |
308 | start_code = p[id].start_code; | |
309 | text_len = p[id].text_len; | |
310 | ||
311 | if (!flat_reloc_valid(r, start_brk - start_data + text_len)) { | |
312 | fprintf(stderr, "BINFMT_FLAT: reloc outside program 0x%x " | |
313 | "(0 - 0x%x/0x%x)\n", | |
314 | (int) r,(int)(start_brk-start_code),(int)text_len); | |
315 | goto failed; | |
316 | } | |
317 | ||
318 | if (r < text_len) /* In text segment */ | |
319 | addr = r + start_code; | |
320 | else /* In data segment */ | |
321 | addr = r - text_len + start_data; | |
322 | ||
323 | /* Range checked already above so doing the range tests is redundant...*/ | |
324 | return(addr); | |
325 | ||
326 | failed: | |
327 | abort(); | |
328 | return RELOC_FAILED; | |
329 | } | |
330 | ||
331 | /****************************************************************************/ | |
332 | ||
333 | /* ??? This does not handle endianness correctly. */ | |
b1d8e52e | 334 | static void old_reloc(struct lib_info *libinfo, uint32_t rl) |
e5fe0c52 PB |
335 | { |
336 | #ifdef DEBUG | |
564e2fe8 | 337 | const char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" }; |
e5fe0c52 PB |
338 | #endif |
339 | uint32_t *ptr; | |
340 | uint32_t offset; | |
341 | int reloc_type; | |
342 | ||
343 | offset = rl & 0x3fffffff; | |
344 | reloc_type = rl >> 30; | |
345 | /* ??? How to handle this? */ | |
346 | #if defined(CONFIG_COLDFIRE) | |
526ccb7a | 347 | ptr = (uint32_t *) ((unsigned long) libinfo->start_code + offset); |
e5fe0c52 | 348 | #else |
526ccb7a | 349 | ptr = (uint32_t *) ((unsigned long) libinfo->start_data + offset); |
e5fe0c52 PB |
350 | #endif |
351 | ||
352 | #ifdef DEBUG | |
353 | fprintf(stderr, "Relocation of variable at DATASEG+%x " | |
354 | "(address %p, currently %x) into segment %s\n", | |
355 | offset, ptr, (int)*ptr, segment[reloc_type]); | |
356 | #endif | |
5fafdf24 | 357 | |
e5fe0c52 PB |
358 | switch (reloc_type) { |
359 | case OLD_FLAT_RELOC_TYPE_TEXT: | |
360 | *ptr += libinfo->start_code; | |
361 | break; | |
362 | case OLD_FLAT_RELOC_TYPE_DATA: | |
363 | *ptr += libinfo->start_data; | |
364 | break; | |
365 | case OLD_FLAT_RELOC_TYPE_BSS: | |
366 | *ptr += libinfo->end_data; | |
367 | break; | |
368 | default: | |
369 | fprintf(stderr, "BINFMT_FLAT: Unknown relocation type=%x\n", | |
370 | reloc_type); | |
371 | break; | |
372 | } | |
373 | DBG_FLT("Relocation became %x\n", (int)*ptr); | |
3b46e624 | 374 | } |
e5fe0c52 PB |
375 | |
376 | /****************************************************************************/ | |
377 | ||
378 | static int load_flat_file(struct linux_binprm * bprm, | |
992f48a0 | 379 | struct lib_info *libinfo, int id, abi_ulong *extra_stack) |
e5fe0c52 PB |
380 | { |
381 | struct flat_hdr * hdr; | |
f562e716 BS |
382 | abi_ulong textpos = 0, datapos = 0; |
383 | abi_long result; | |
992f48a0 BS |
384 | abi_ulong realdatastart = 0; |
385 | abi_ulong text_len, data_len, bss_len, stack_len, flags; | |
992f48a0 BS |
386 | abi_ulong extra; |
387 | abi_ulong reloc = 0, rp; | |
e5fe0c52 | 388 | int i, rev, relocs = 0; |
992f48a0 | 389 | abi_ulong fpos; |
e7730352 | 390 | abi_ulong start_code; |
992f48a0 | 391 | abi_ulong indx_len; |
e5fe0c52 PB |
392 | |
393 | hdr = ((struct flat_hdr *) bprm->buf); /* exec-header */ | |
394 | ||
395 | text_len = ntohl(hdr->data_start); | |
396 | data_len = ntohl(hdr->data_end) - ntohl(hdr->data_start); | |
397 | bss_len = ntohl(hdr->bss_end) - ntohl(hdr->data_end); | |
398 | stack_len = ntohl(hdr->stack_size); | |
399 | if (extra_stack) { | |
400 | stack_len += *extra_stack; | |
401 | *extra_stack = stack_len; | |
402 | } | |
403 | relocs = ntohl(hdr->reloc_count); | |
404 | flags = ntohl(hdr->flags); | |
405 | rev = ntohl(hdr->rev); | |
406 | ||
407 | DBG_FLT("BINFMT_FLAT: Loading file: %s\n", bprm->filename); | |
408 | ||
409 | if (rev != FLAT_VERSION && rev != OLD_FLAT_VERSION) { | |
410 | fprintf(stderr, "BINFMT_FLAT: bad magic/rev (0x%x, need 0x%x)\n", | |
411 | rev, (int) FLAT_VERSION); | |
412 | return -ENOEXEC; | |
413 | } | |
3b46e624 | 414 | |
e5fe0c52 PB |
415 | /* Don't allow old format executables to use shared libraries */ |
416 | if (rev == OLD_FLAT_VERSION && id != 0) { | |
417 | fprintf(stderr, "BINFMT_FLAT: shared libraries are not available\n"); | |
418 | return -ENOEXEC; | |
419 | } | |
420 | ||
421 | /* | |
422 | * fix up the flags for the older format, there were all kinds | |
423 | * of endian hacks, this only works for the simple cases | |
424 | */ | |
425 | if (rev == OLD_FLAT_VERSION && flat_old_ram_flag(flags)) | |
426 | flags = FLAT_FLAG_RAM; | |
427 | ||
428 | #ifndef CONFIG_BINFMT_ZFLAT | |
429 | if (flags & (FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA)) { | |
430 | fprintf(stderr, "Support for ZFLAT executables is not enabled\n"); | |
431 | return -ENOEXEC; | |
432 | } | |
433 | #endif | |
434 | ||
435 | /* | |
436 | * calculate the extra space we need to map in | |
437 | */ | |
992f48a0 | 438 | extra = relocs * sizeof(abi_ulong); |
e5fe0c52 PB |
439 | if (extra < bss_len + stack_len) |
440 | extra = bss_len + stack_len; | |
441 | ||
2a1094cd PB |
442 | /* Add space for library base pointers. Make sure this does not |
443 | misalign the doesn't misalign the data segment. */ | |
992f48a0 BS |
444 | indx_len = MAX_SHARED_LIBS * sizeof(abi_ulong); |
445 | indx_len = (indx_len + 15) & ~(abi_ulong)15; | |
2a1094cd | 446 | |
ee947430 | 447 | /* |
6f9ff551 | 448 | * Allocate the address space. |
ee947430 AB |
449 | */ |
450 | probe_guest_base(bprm->filename, 0, | |
a3a67f54 | 451 | text_len + data_len + extra + indx_len - 1); |
ee947430 | 452 | |
e5fe0c52 PB |
453 | /* |
454 | * there are a couple of cases here, the separate code/data | |
455 | * case, and then the fully copied to RAM case which lumps | |
456 | * it all together. | |
457 | */ | |
458 | if ((flags & (FLAT_FLAG_RAM|FLAT_FLAG_GZIP)) == 0) { | |
459 | /* | |
460 | * this should give us a ROM ptr, but if it doesn't we don't | |
461 | * really care | |
462 | */ | |
463 | DBG_FLT("BINFMT_FLAT: ROM mapping of file (we hope)\n"); | |
464 | ||
465 | textpos = target_mmap(0, text_len, PROT_READ|PROT_EXEC, | |
466 | MAP_PRIVATE, bprm->fd, 0); | |
5fafdf24 | 467 | if (textpos == -1) { |
e5fe0c52 PB |
468 | fprintf(stderr, "Unable to mmap process text\n"); |
469 | return -1; | |
470 | } | |
471 | ||
2a1094cd | 472 | realdatastart = target_mmap(0, data_len + extra + indx_len, |
e5fe0c52 PB |
473 | PROT_READ|PROT_WRITE|PROT_EXEC, |
474 | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); | |
475 | ||
476 | if (realdatastart == -1) { | |
477 | fprintf(stderr, "Unable to allocate RAM for process data\n"); | |
478 | return realdatastart; | |
479 | } | |
2a1094cd | 480 | datapos = realdatastart + indx_len; |
e5fe0c52 PB |
481 | |
482 | DBG_FLT("BINFMT_FLAT: Allocated data+bss+stack (%d bytes): %x\n", | |
483 | (int)(data_len + bss_len + stack_len), (int)datapos); | |
484 | ||
485 | fpos = ntohl(hdr->data_start); | |
486 | #ifdef CONFIG_BINFMT_ZFLAT | |
487 | if (flags & FLAT_FLAG_GZDATA) { | |
5fafdf24 | 488 | result = decompress_exec(bprm, fpos, (char *) datapos, |
992f48a0 | 489 | data_len + (relocs * sizeof(abi_ulong))) |
e5fe0c52 PB |
490 | } else |
491 | #endif | |
492 | { | |
493 | result = target_pread(bprm->fd, datapos, | |
992f48a0 | 494 | data_len + (relocs * sizeof(abi_ulong)), |
e5fe0c52 PB |
495 | fpos); |
496 | } | |
497 | if (result < 0) { | |
498 | fprintf(stderr, "Unable to read data+bss\n"); | |
499 | return result; | |
500 | } | |
501 | ||
502 | reloc = datapos + (ntohl(hdr->reloc_start) - text_len); | |
e5fe0c52 PB |
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 | |
518 | #ifdef CONFIG_BINFMT_ZFLAT | |
519 | #error code needs checking | |
520 | /* | |
521 | * load it all in and treat it like a RAM load from now on | |
522 | */ | |
523 | if (flags & FLAT_FLAG_GZIP) { | |
524 | result = decompress_exec(bprm, sizeof (struct flat_hdr), | |
525 | (((char *) textpos) + sizeof (struct flat_hdr)), | |
526 | (text_len + data_len + (relocs * sizeof(unsigned long)) | |
527 | - sizeof (struct flat_hdr)), | |
528 | 0); | |
529 | memmove((void *) datapos, (void *) realdatastart, | |
530 | data_len + (relocs * sizeof(unsigned long))); | |
531 | } else if (flags & FLAT_FLAG_GZDATA) { | |
532 | fpos = 0; | |
533 | result = bprm->file->f_op->read(bprm->file, | |
534 | (char *) textpos, text_len, &fpos); | |
71987b12 | 535 | if (!is_error(result)) { |
e5fe0c52 PB |
536 | result = decompress_exec(bprm, text_len, (char *) datapos, |
537 | data_len + (relocs * sizeof(unsigned long)), 0); | |
71987b12 | 538 | } |
e5fe0c52 PB |
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); | |
e5fe0c52 PB |
563 | |
564 | DBG_FLT("%s %s: TEXT=%x-%x DATA=%x-%x BSS=%x-%x\n", | |
565 | id ? "Lib" : "Load", bprm->filename, | |
e7730352 | 566 | (int) start_code, (int) (textpos + text_len), |
e5fe0c52 PB |
567 | (int) datapos, |
568 | (int) (datapos + data_len), | |
569 | (int) (datapos + data_len), | |
570 | (int) (((datapos + data_len + bss_len) + 3) & ~3)); | |
571 | ||
572 | text_len -= sizeof(struct flat_hdr); /* the real code len */ | |
573 | ||
574 | /* Store the current module values into the global library structure */ | |
575 | libinfo[id].start_code = start_code; | |
576 | libinfo[id].start_data = datapos; | |
577 | libinfo[id].end_data = datapos + data_len; | |
578 | libinfo[id].start_brk = datapos + data_len + bss_len; | |
579 | libinfo[id].text_len = text_len; | |
580 | libinfo[id].loaded = 1; | |
581 | libinfo[id].entry = (0x00ffffff & ntohl(hdr->entry)) + textpos; | |
582 | libinfo[id].build_date = ntohl(hdr->build_date); | |
3b46e624 | 583 | |
e5fe0c52 PB |
584 | /* |
585 | * We just load the allocations into some temporary memory to | |
586 | * help simplify all this mumbo jumbo | |
587 | * | |
588 | * We've got two different sections of relocation entries. | |
b4916d7b | 589 | * The first is the GOT which resides at the beginning of the data segment |
e5fe0c52 PB |
590 | * and is terminated with a -1. This one can be relocated in place. |
591 | * The second is the extra relocation entries tacked after the image's | |
592 | * data segment. These require a little more processing as the entry is | |
593 | * really an offset into the image which contains an offset into the | |
594 | * image. | |
595 | */ | |
596 | if (flags & FLAT_FLAG_GOTPIC) { | |
597 | rp = datapos; | |
598 | while (1) { | |
992f48a0 | 599 | abi_ulong addr; |
2f619698 FB |
600 | if (get_user_ual(addr, rp)) |
601 | return -EFAULT; | |
e5fe0c52 PB |
602 | if (addr == -1) |
603 | break; | |
604 | if (addr) { | |
605 | addr = calc_reloc(addr, libinfo, id, 0); | |
606 | if (addr == RELOC_FAILED) | |
607 | return -ENOEXEC; | |
2f619698 FB |
608 | if (put_user_ual(addr, rp)) |
609 | return -EFAULT; | |
e5fe0c52 | 610 | } |
992f48a0 | 611 | rp += sizeof(abi_ulong); |
e5fe0c52 PB |
612 | } |
613 | } | |
614 | ||
615 | /* | |
616 | * Now run through the relocation entries. | |
617 | * We've got to be careful here as C++ produces relocatable zero | |
618 | * entries in the constructor and destructor tables which are then | |
619 | * tested for being not zero (which will always occur unless we're | |
620 | * based from address zero). This causes an endless loop as __start | |
621 | * is at zero. The solution used is to not relocate zero addresses. | |
622 | * This has the negative side effect of not allowing a global data | |
623 | * reference to be statically initialised to _stext (I've moved | |
624 | * __start to address 4 so that is okay). | |
625 | */ | |
626 | if (rev > OLD_FLAT_VERSION) { | |
c3109ba1 | 627 | abi_ulong persistent = 0; |
e5fe0c52 | 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; | |
c3109ba1 MF |
636 | relval = ntohl(relval); |
637 | if (flat_set_persistent(relval, &persistent)) | |
638 | continue; | |
e5fe0c52 PB |
639 | addr = flat_get_relocate_addr(relval); |
640 | rp = calc_reloc(addr, libinfo, id, 1); | |
641 | if (rp == RELOC_FAILED) | |
642 | return -ENOEXEC; | |
643 | ||
644 | /* Get the pointer's value. */ | |
2f619698 FB |
645 | if (get_user_ual(addr, rp)) |
646 | return -EFAULT; | |
9721cf2c | 647 | addr = flat_get_addr_from_rp(addr, relval, flags, &persistent); |
e5fe0c52 PB |
648 | if (addr != 0) { |
649 | /* | |
650 | * Do the relocation. PIC relocs in the data section are | |
651 | * already in target order | |
652 | */ | |
e5fe0c52 | 653 | if ((flags & FLAT_FLAG_GOTPIC) == 0) |
c3109ba1 | 654 | addr = ntohl(addr); |
e5fe0c52 PB |
655 | addr = calc_reloc(addr, libinfo, id, 0); |
656 | if (addr == RELOC_FAILED) | |
657 | return -ENOEXEC; | |
658 | ||
659 | /* Write back the relocated pointer. */ | |
c3109ba1 | 660 | if (flat_put_addr_at_rp(rp, addr, relval)) |
2f619698 | 661 | return -EFAULT; |
e5fe0c52 PB |
662 | } |
663 | } | |
664 | } else { | |
665 | for (i = 0; i < relocs; i++) { | |
992f48a0 | 666 | abi_ulong relval; |
2f619698 FB |
667 | if (get_user_ual(relval, reloc + i * sizeof(abi_ulong))) |
668 | return -EFAULT; | |
e5fe0c52 PB |
669 | old_reloc(&libinfo[0], relval); |
670 | } | |
671 | } | |
3b46e624 | 672 | |
e5fe0c52 | 673 | /* zero the BSS. */ |
3e8f1628 | 674 | memset(g2h_untagged(datapos + data_len), 0, bss_len); |
e5fe0c52 PB |
675 | |
676 | return 0; | |
677 | } | |
678 | ||
679 | ||
680 | /****************************************************************************/ | |
681 | #ifdef CONFIG_BINFMT_SHARED_FLAT | |
682 | ||
683 | /* | |
684 | * Load a shared library into memory. The library gets its own data | |
685 | * segment (including bss) but not argv/argc/environ. | |
686 | */ | |
687 | ||
688 | static int load_flat_shared_library(int id, struct lib_info *libs) | |
689 | { | |
690 | struct linux_binprm bprm; | |
691 | int res; | |
692 | char buf[16]; | |
693 | ||
694 | /* Create the file name */ | |
695 | sprintf(buf, "/lib/lib%d.so", id); | |
696 | ||
697 | /* Open the file up */ | |
698 | bprm.filename = buf; | |
699 | bprm.file = open_exec(bprm.filename); | |
700 | res = PTR_ERR(bprm.file); | |
701 | if (IS_ERR(bprm.file)) | |
702 | return res; | |
703 | ||
704 | res = prepare_binprm(&bprm); | |
705 | ||
71987b12 | 706 | if (!is_error(res)) { |
e5fe0c52 | 707 | res = load_flat_file(&bprm, libs, id, NULL); |
71987b12 | 708 | } |
e5fe0c52 PB |
709 | if (bprm.file) { |
710 | allow_write_access(bprm.file); | |
711 | fput(bprm.file); | |
712 | bprm.file = NULL; | |
713 | } | |
714 | return(res); | |
715 | } | |
716 | ||
717 | #endif /* CONFIG_BINFMT_SHARED_FLAT */ | |
718 | ||
f0116c54 | 719 | int load_flt_binary(struct linux_binprm *bprm, struct image_info *info) |
e5fe0c52 PB |
720 | { |
721 | struct lib_info libinfo[MAX_SHARED_LIBS]; | |
59baae9a | 722 | abi_ulong p; |
992f48a0 BS |
723 | abi_ulong stack_len; |
724 | abi_ulong start_addr; | |
725 | abi_ulong sp; | |
e5fe0c52 PB |
726 | int res; |
727 | int i, j; | |
728 | ||
729 | memset(libinfo, 0, sizeof(libinfo)); | |
730 | /* | |
731 | * We have to add the size of our arguments to our stack size | |
732 | * otherwise it's too easy for users to create stack overflows | |
733 | * by passing in a huge argument list. And yes, we have to be | |
734 | * pedantic and include space for the argv/envp array as it may have | |
735 | * a lot of entries. | |
736 | */ | |
82a39595 MF |
737 | stack_len = 0; |
738 | for (i = 0; i < bprm->argc; ++i) { | |
739 | /* the argv strings */ | |
740 | stack_len += strlen(bprm->argv[i]); | |
741 | } | |
742 | for (i = 0; i < bprm->envc; ++i) { | |
743 | /* the envp strings */ | |
744 | stack_len += strlen(bprm->envp[i]); | |
745 | } | |
e5fe0c52 PB |
746 | stack_len += (bprm->argc + 1) * 4; /* the argv array */ |
747 | stack_len += (bprm->envc + 1) * 4; /* the envp array */ | |
748 | ||
3b46e624 | 749 | |
e5fe0c52 | 750 | res = load_flat_file(bprm, libinfo, 0, &stack_len); |
71987b12 | 751 | if (is_error(res)) { |
e5fe0c52 | 752 | return res; |
71987b12 | 753 | } |
3b46e624 | 754 | |
e5fe0c52 PB |
755 | /* Update data segment pointers for all libraries */ |
756 | for (i=0; i<MAX_SHARED_LIBS; i++) { | |
757 | if (libinfo[i].loaded) { | |
d5308ea6 LV |
758 | abi_ulong seg; |
759 | seg = libinfo[i].start_data; | |
e5fe0c52 | 760 | for (j=0; j<MAX_SHARED_LIBS; j++) { |
d5308ea6 | 761 | seg -= 4; |
2f619698 FB |
762 | /* FIXME - handle put_user() failures */ |
763 | if (put_user_ual(libinfo[j].loaded | |
764 | ? libinfo[j].start_data | |
765 | : UNLOADED_LIB, | |
d5308ea6 | 766 | seg)) |
2f619698 | 767 | return -EFAULT; |
e5fe0c52 PB |
768 | } |
769 | } | |
770 | } | |
771 | ||
772 | p = ((libinfo[0].start_brk + stack_len + 3) & ~3) - 4; | |
773 | DBG_FLT("p=%x\n", (int)p); | |
774 | ||
775 | /* Copy argv/envp. */ | |
e5fe0c52 | 776 | p = copy_strings(p, bprm->envc, bprm->envp); |
388c4508 | 777 | p = copy_strings(p, bprm->argc, bprm->argv); |
e5fe0c52 | 778 | /* Align stack. */ |
992f48a0 | 779 | sp = p & ~(abi_ulong)(sizeof(abi_ulong) - 1); |
b35d7448 PB |
780 | /* Enforce final stack alignment of 16 bytes. This is sufficient |
781 | for all current targets, and excess alignment is harmless. */ | |
782 | stack_len = bprm->envc + bprm->argc + 2; | |
669dcb60 | 783 | stack_len += flat_argvp_envp_on_stack() ? 2 : 0; /* argv, argp */ |
5c76d652 | 784 | stack_len += 1; /* argc */ |
992f48a0 | 785 | stack_len *= sizeof(abi_ulong); |
5c76d652 | 786 | sp -= (sp - stack_len) & 15; |
c3109ba1 MF |
787 | sp = loader_build_argptr(bprm->envc, bprm->argc, sp, p, |
788 | flat_argvp_envp_on_stack()); | |
3b46e624 | 789 | |
e5fe0c52 PB |
790 | /* Fake some return addresses to ensure the call chain will |
791 | * initialise library in order for us. We are required to call | |
792 | * lib 1 first, then 2, ... and finally the main program (id 0). | |
793 | */ | |
794 | start_addr = libinfo[0].entry; | |
795 | ||
796 | #ifdef CONFIG_BINFMT_SHARED_FLAT | |
797 | #error here | |
798 | for (i = MAX_SHARED_LIBS-1; i>0; i--) { | |
799 | if (libinfo[i].loaded) { | |
6f9ff551 | 800 | /* Push previous first to call address */ |
2f619698 FB |
801 | --sp; |
802 | if (put_user_ual(start_addr, sp)) | |
803 | return -EFAULT; | |
e5fe0c52 PB |
804 | start_addr = libinfo[i].entry; |
805 | } | |
806 | } | |
807 | #endif | |
3b46e624 | 808 | |
e5fe0c52 PB |
809 | /* Stash our initial stack pointer into the mm structure */ |
810 | info->start_code = libinfo[0].start_code; | |
734a659a | 811 | info->end_code = libinfo[0].start_code + libinfo[0].text_len; |
e5fe0c52 PB |
812 | info->start_data = libinfo[0].start_data; |
813 | info->end_data = libinfo[0].end_data; | |
0662a626 | 814 | info->brk = libinfo[0].start_brk; |
e5fe0c52 | 815 | info->start_stack = sp; |
97374d38 | 816 | info->stack_limit = libinfo[0].start_brk; |
e5fe0c52 | 817 | info->entry = start_addr; |
978efd6a PB |
818 | info->code_offset = info->start_code; |
819 | info->data_offset = info->start_data - libinfo[0].text_len; | |
820 | ||
e5fe0c52 PB |
821 | DBG_FLT("start_thread(entry=0x%x, start_stack=0x%x)\n", |
822 | (int)info->entry, (int)info->start_stack); | |
3b46e624 | 823 | |
e5fe0c52 PB |
824 | return 0; |
825 | } |