Merge tag 'for-upstream' of git://repo.or.cz/qemu/kevin into staging
[qemu.git] / linux-user / flatload.c
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, see <http://www.gnu.org/licenses/>.
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
36 #include "qemu/osdep.h"
37
38 #include "qemu.h"
39 #include "user-internals.h"
40 #include "loader.h"
41 #include "user-mmap.h"
42 #include "flat.h"
43 #include "target_flat.h"
44
45 //#define DEBUG
46
47 #ifdef DEBUG
48 #define DBG_FLT(...) printf(__VA_ARGS__)
49 #else
50 #define DBG_FLT(...)
51 #endif
52
53 #define RELOC_FAILED 0xff00ff01 /* Relocation incorrect somewhere */
54 #define UNLOADED_LIB 0x7ff000ff /* Placeholder for unused library */
55
56 struct lib_info {
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 */
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
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. */
81 static abi_ulong copy_strings(abi_ulong p, int n, char **s)
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
94 static int target_pread(int fd, abi_ulong ptr, abi_ulong len,
95 abi_ulong offset)
96 {
97 void *buf;
98 int ret;
99
100 buf = lock_user(VERIFY_WRITE, ptr, len, 0);
101 if (!buf) {
102 return -EFAULT;
103 }
104 ret = pread(fd, buf, len, offset);
105 if (ret < 0) {
106 ret = -errno;
107 }
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;
230 if (is_error(ret)) {
231 break;
232 }
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
261 static abi_ulong
262 calc_reloc(abi_ulong r, struct lib_info *p, int curid, int internalp)
263 {
264 abi_ulong addr;
265 int id;
266 abi_ulong start_brk;
267 abi_ulong start_data;
268 abi_ulong text_len;
269 abi_ulong start_code;
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;
290 } else if (!p[id].loaded && is_error(load_flat_shared_library(id, p))) {
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. */
334 static void old_reloc(struct lib_info *libinfo, uint32_t rl)
335 {
336 #ifdef DEBUG
337 const char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" };
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)
347 ptr = (uint32_t *) ((unsigned long) libinfo->start_code + offset);
348 #else
349 ptr = (uint32_t *) ((unsigned long) libinfo->start_data + offset);
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
357
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);
374 }
375
376 /****************************************************************************/
377
378 static int load_flat_file(struct linux_binprm * bprm,
379 struct lib_info *libinfo, int id, abi_ulong *extra_stack)
380 {
381 struct flat_hdr * hdr;
382 abi_ulong textpos = 0, datapos = 0;
383 abi_long result;
384 abi_ulong realdatastart = 0;
385 abi_ulong text_len, data_len, bss_len, stack_len, flags;
386 abi_ulong extra;
387 abi_ulong reloc = 0, rp;
388 int i, rev, relocs = 0;
389 abi_ulong fpos;
390 abi_ulong start_code;
391 abi_ulong indx_len;
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 }
414
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 */
438 extra = relocs * sizeof(abi_ulong);
439 if (extra < bss_len + stack_len)
440 extra = bss_len + stack_len;
441
442 /* Add space for library base pointers. Make sure this does not
443 misalign the doesn't misalign the data segment. */
444 indx_len = MAX_SHARED_LIBS * sizeof(abi_ulong);
445 indx_len = (indx_len + 15) & ~(abi_ulong)15;
446
447 /*
448 * Allocate the address space.
449 */
450 probe_guest_base(bprm->filename, 0,
451 text_len + data_len + extra + indx_len);
452
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);
467 if (textpos == -1) {
468 fprintf(stderr, "Unable to mmap process text\n");
469 return -1;
470 }
471
472 realdatastart = target_mmap(0, data_len + extra + indx_len,
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 }
480 datapos = realdatastart + indx_len;
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) {
488 result = decompress_exec(bprm, fpos, (char *) datapos,
489 data_len + (relocs * sizeof(abi_ulong)))
490 } else
491 #endif
492 {
493 result = target_pread(bprm->fd, datapos,
494 data_len + (relocs * sizeof(abi_ulong)),
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);
503
504 } else {
505
506 textpos = target_mmap(0, text_len + data_len + extra + indx_len,
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);
515 datapos = realdatastart + indx_len;
516 reloc = (textpos + ntohl(hdr->reloc_start) + indx_len);
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);
535 if (!is_error(result)) {
536 result = decompress_exec(bprm, text_len, (char *) datapos,
537 data_len + (relocs * sizeof(unsigned long)), 0);
538 }
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,
547 data_len + (relocs * sizeof(abi_ulong)),
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
564 DBG_FLT("%s %s: TEXT=%x-%x DATA=%x-%x BSS=%x-%x\n",
565 id ? "Lib" : "Load", bprm->filename,
566 (int) start_code, (int) (textpos + text_len),
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);
583
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.
589 * The first is the GOT which resides at the beginning of the data segment
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) {
599 abi_ulong addr;
600 if (get_user_ual(addr, rp))
601 return -EFAULT;
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;
608 if (put_user_ual(addr, rp))
609 return -EFAULT;
610 }
611 rp += sizeof(abi_ulong);
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) {
627 abi_ulong persistent = 0;
628 for (i = 0; i < relocs; i++) {
629 abi_ulong addr, relval;
630
631 /* Get the address of the pointer to be
632 relocated (of course, the address has to be
633 relocated first). */
634 if (get_user_ual(relval, reloc + i * sizeof(abi_ulong)))
635 return -EFAULT;
636 relval = ntohl(relval);
637 if (flat_set_persistent(relval, &persistent))
638 continue;
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. */
645 if (get_user_ual(addr, rp))
646 return -EFAULT;
647 addr = flat_get_addr_from_rp(addr, relval, flags, &persistent);
648 if (addr != 0) {
649 /*
650 * Do the relocation. PIC relocs in the data section are
651 * already in target order
652 */
653 if ((flags & FLAT_FLAG_GOTPIC) == 0)
654 addr = ntohl(addr);
655 addr = calc_reloc(addr, libinfo, id, 0);
656 if (addr == RELOC_FAILED)
657 return -ENOEXEC;
658
659 /* Write back the relocated pointer. */
660 if (flat_put_addr_at_rp(rp, addr, relval))
661 return -EFAULT;
662 }
663 }
664 } else {
665 for (i = 0; i < relocs; i++) {
666 abi_ulong relval;
667 if (get_user_ual(relval, reloc + i * sizeof(abi_ulong)))
668 return -EFAULT;
669 old_reloc(&libinfo[0], relval);
670 }
671 }
672
673 /* zero the BSS. */
674 memset(g2h_untagged(datapos + data_len), 0, bss_len);
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
706 if (!is_error(res)) {
707 res = load_flat_file(&bprm, libs, id, NULL);
708 }
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
719 int load_flt_binary(struct linux_binprm *bprm, struct image_info *info)
720 {
721 struct lib_info libinfo[MAX_SHARED_LIBS];
722 abi_ulong p;
723 abi_ulong stack_len;
724 abi_ulong start_addr;
725 abi_ulong sp;
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 */
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 }
746 stack_len += (bprm->argc + 1) * 4; /* the argv array */
747 stack_len += (bprm->envc + 1) * 4; /* the envp array */
748
749
750 res = load_flat_file(bprm, libinfo, 0, &stack_len);
751 if (is_error(res)) {
752 return res;
753 }
754
755 /* Update data segment pointers for all libraries */
756 for (i=0; i<MAX_SHARED_LIBS; i++) {
757 if (libinfo[i].loaded) {
758 abi_ulong p;
759 p = libinfo[i].start_data;
760 for (j=0; j<MAX_SHARED_LIBS; j++) {
761 p -= 4;
762 /* FIXME - handle put_user() failures */
763 if (put_user_ual(libinfo[j].loaded
764 ? libinfo[j].start_data
765 : UNLOADED_LIB,
766 p))
767 return -EFAULT;
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. */
776 p = copy_strings(p, bprm->envc, bprm->envp);
777 p = copy_strings(p, bprm->argc, bprm->argv);
778 /* Align stack. */
779 sp = p & ~(abi_ulong)(sizeof(abi_ulong) - 1);
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;
783 stack_len += flat_argvp_envp_on_stack() ? 2 : 0; /* arvg, argp */
784 stack_len += 1; /* argc */
785 stack_len *= sizeof(abi_ulong);
786 sp -= (sp - stack_len) & 15;
787 sp = loader_build_argptr(bprm->envc, bprm->argc, sp, p,
788 flat_argvp_envp_on_stack());
789
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) {
800 /* Push previous first to call address */
801 --sp;
802 if (put_user_ual(start_addr, sp))
803 return -EFAULT;
804 start_addr = libinfo[i].entry;
805 }
806 }
807 #endif
808
809 /* Stash our initial stack pointer into the mm structure */
810 info->start_code = libinfo[0].start_code;
811 info->end_code = libinfo[0].start_code = libinfo[0].text_len;
812 info->start_data = libinfo[0].start_data;
813 info->end_data = libinfo[0].end_data;
814 info->start_brk = libinfo[0].start_brk;
815 info->start_stack = sp;
816 info->stack_limit = libinfo[0].start_brk;
817 info->entry = start_addr;
818 info->code_offset = info->start_code;
819 info->data_offset = info->start_data - libinfo[0].text_len;
820
821 DBG_FLT("start_thread(entry=0x%x, start_stack=0x%x)\n",
822 (int)info->entry, (int)info->start_stack);
823
824 return 0;
825 }