i386: Fix pkg_id offset for EPYC cpu models
[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 "flat.h"
40 #include <target_flat.h>
41
42 //#define DEBUG
43
44 #ifdef DEBUG
45 #define DBG_FLT(...) printf(__VA_ARGS__)
46 #else
47 #define DBG_FLT(...)
48 #endif
49
50 #define RELOC_FAILED 0xff00ff01 /* Relocation incorrect somewhere */
51 #define UNLOADED_LIB 0x7ff000ff /* Placeholder for unused library */
52
53 struct lib_info {
54 abi_ulong start_code; /* Start of text segment */
55 abi_ulong start_data; /* Start of data segment */
56 abi_ulong end_data; /* Start of bss section */
57 abi_ulong start_brk; /* End of data segment */
58 abi_ulong text_len; /* Length of text segment */
59 abi_ulong entry; /* Start address for this module */
60 abi_ulong build_date; /* When this one was compiled */
61 short loaded; /* Has this library been loaded? */
62 };
63
64 #ifdef CONFIG_BINFMT_SHARED_FLAT
65 static int load_flat_shared_library(int id, struct lib_info *p);
66 #endif
67
68 struct linux_binprm;
69
70 /****************************************************************************/
71 /*
72 * create_flat_tables() parses the env- and arg-strings in new user
73 * memory and creates the pointer tables from them, and puts their
74 * addresses on the "stack", returning the new stack pointer value.
75 */
76
77 /* Push a block of strings onto the guest stack. */
78 static abi_ulong copy_strings(abi_ulong p, int n, char **s)
79 {
80 int len;
81
82 while (n-- > 0) {
83 len = strlen(s[n]) + 1;
84 p -= len;
85 memcpy_to_target(p, s[n], len);
86 }
87
88 return p;
89 }
90
91 static int target_pread(int fd, abi_ulong ptr, abi_ulong len,
92 abi_ulong offset)
93 {
94 void *buf;
95 int ret;
96
97 buf = lock_user(VERIFY_WRITE, ptr, len, 0);
98 if (!buf) {
99 return -EFAULT;
100 }
101 ret = pread(fd, buf, len, offset);
102 if (ret < 0) {
103 ret = -errno;
104 }
105 unlock_user(buf, ptr, len);
106 return ret;
107 }
108 /****************************************************************************/
109
110 #ifdef CONFIG_BINFMT_ZFLAT
111
112 #include <linux/zlib.h>
113
114 #define LBUFSIZE 4000
115
116 /* gzip flag byte */
117 #define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */
118 #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
119 #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
120 #define ORIG_NAME 0x08 /* bit 3 set: original file name present */
121 #define COMMENT 0x10 /* bit 4 set: file comment present */
122 #define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
123 #define RESERVED 0xC0 /* bit 6,7: reserved */
124
125 static int decompress_exec(
126 struct linux_binprm *bprm,
127 unsigned long offset,
128 char *dst,
129 long len,
130 int fd)
131 {
132 unsigned char *buf;
133 z_stream strm;
134 loff_t fpos;
135 int ret, retval;
136
137 DBG_FLT("decompress_exec(offset=%x,buf=%x,len=%x)\n",(int)offset, (int)dst, (int)len);
138
139 memset(&strm, 0, sizeof(strm));
140 strm.workspace = kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL);
141 if (strm.workspace == NULL) {
142 DBG_FLT("binfmt_flat: no memory for decompress workspace\n");
143 return -ENOMEM;
144 }
145 buf = kmalloc(LBUFSIZE, GFP_KERNEL);
146 if (buf == NULL) {
147 DBG_FLT("binfmt_flat: no memory for read buffer\n");
148 retval = -ENOMEM;
149 goto out_free;
150 }
151
152 /* Read in first chunk of data and parse gzip header. */
153 fpos = offset;
154 ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos);
155
156 strm.next_in = buf;
157 strm.avail_in = ret;
158 strm.total_in = 0;
159
160 retval = -ENOEXEC;
161
162 /* Check minimum size -- gzip header */
163 if (ret < 10) {
164 DBG_FLT("binfmt_flat: file too small?\n");
165 goto out_free_buf;
166 }
167
168 /* Check gzip magic number */
169 if ((buf[0] != 037) || ((buf[1] != 0213) && (buf[1] != 0236))) {
170 DBG_FLT("binfmt_flat: unknown compression magic?\n");
171 goto out_free_buf;
172 }
173
174 /* Check gzip method */
175 if (buf[2] != 8) {
176 DBG_FLT("binfmt_flat: unknown compression method?\n");
177 goto out_free_buf;
178 }
179 /* Check gzip flags */
180 if ((buf[3] & ENCRYPTED) || (buf[3] & CONTINUATION) ||
181 (buf[3] & RESERVED)) {
182 DBG_FLT("binfmt_flat: unknown flags?\n");
183 goto out_free_buf;
184 }
185
186 ret = 10;
187 if (buf[3] & EXTRA_FIELD) {
188 ret += 2 + buf[10] + (buf[11] << 8);
189 if (unlikely(LBUFSIZE == ret)) {
190 DBG_FLT("binfmt_flat: buffer overflow (EXTRA)?\n");
191 goto out_free_buf;
192 }
193 }
194 if (buf[3] & ORIG_NAME) {
195 for (; ret < LBUFSIZE && (buf[ret] != 0); ret++)
196 ;
197 if (unlikely(LBUFSIZE == ret)) {
198 DBG_FLT("binfmt_flat: buffer overflow (ORIG_NAME)?\n");
199 goto out_free_buf;
200 }
201 }
202 if (buf[3] & COMMENT) {
203 for (; ret < LBUFSIZE && (buf[ret] != 0); ret++)
204 ;
205 if (unlikely(LBUFSIZE == ret)) {
206 DBG_FLT("binfmt_flat: buffer overflow (COMMENT)?\n");
207 goto out_free_buf;
208 }
209 }
210
211 strm.next_in += ret;
212 strm.avail_in -= ret;
213
214 strm.next_out = dst;
215 strm.avail_out = len;
216 strm.total_out = 0;
217
218 if (zlib_inflateInit2(&strm, -MAX_WBITS) != Z_OK) {
219 DBG_FLT("binfmt_flat: zlib init failed?\n");
220 goto out_free_buf;
221 }
222
223 while ((ret = zlib_inflate(&strm, Z_NO_FLUSH)) == Z_OK) {
224 ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos);
225 if (ret <= 0)
226 break;
227 if (is_error(ret)) {
228 break;
229 }
230 len -= ret;
231
232 strm.next_in = buf;
233 strm.avail_in = ret;
234 strm.total_in = 0;
235 }
236
237 if (ret < 0) {
238 DBG_FLT("binfmt_flat: decompression failed (%d), %s\n",
239 ret, strm.msg);
240 goto out_zlib;
241 }
242
243 retval = 0;
244 out_zlib:
245 zlib_inflateEnd(&strm);
246 out_free_buf:
247 kfree(buf);
248 out_free:
249 kfree(strm.workspace);
250 out:
251 return retval;
252 }
253
254 #endif /* CONFIG_BINFMT_ZFLAT */
255
256 /****************************************************************************/
257
258 static abi_ulong
259 calc_reloc(abi_ulong r, struct lib_info *p, int curid, int internalp)
260 {
261 abi_ulong addr;
262 int id;
263 abi_ulong start_brk;
264 abi_ulong start_data;
265 abi_ulong text_len;
266 abi_ulong start_code;
267
268 #ifdef CONFIG_BINFMT_SHARED_FLAT
269 #error needs checking
270 if (r == 0)
271 id = curid; /* Relocs of 0 are always self referring */
272 else {
273 id = (r >> 24) & 0xff; /* Find ID for this reloc */
274 r &= 0x00ffffff; /* Trim ID off here */
275 }
276 if (id >= MAX_SHARED_LIBS) {
277 fprintf(stderr, "BINFMT_FLAT: reference 0x%x to shared library %d\n",
278 (unsigned) r, id);
279 goto failed;
280 }
281 if (curid != id) {
282 if (internalp) {
283 fprintf(stderr, "BINFMT_FLAT: reloc address 0x%x not "
284 "in same module (%d != %d)\n",
285 (unsigned) r, curid, id);
286 goto failed;
287 } else if (!p[id].loaded && is_error(load_flat_shared_library(id, p))) {
288 fprintf(stderr, "BINFMT_FLAT: failed to load library %d\n", id);
289 goto failed;
290 }
291 /* Check versioning information (i.e. time stamps) */
292 if (p[id].build_date && p[curid].build_date
293 && p[curid].build_date < p[id].build_date) {
294 fprintf(stderr, "BINFMT_FLAT: library %d is younger than %d\n",
295 id, curid);
296 goto failed;
297 }
298 }
299 #else
300 id = 0;
301 #endif
302
303 start_brk = p[id].start_brk;
304 start_data = p[id].start_data;
305 start_code = p[id].start_code;
306 text_len = p[id].text_len;
307
308 if (!flat_reloc_valid(r, start_brk - start_data + text_len)) {
309 fprintf(stderr, "BINFMT_FLAT: reloc outside program 0x%x "
310 "(0 - 0x%x/0x%x)\n",
311 (int) r,(int)(start_brk-start_code),(int)text_len);
312 goto failed;
313 }
314
315 if (r < text_len) /* In text segment */
316 addr = r + start_code;
317 else /* In data segment */
318 addr = r - text_len + start_data;
319
320 /* Range checked already above so doing the range tests is redundant...*/
321 return(addr);
322
323 failed:
324 abort();
325 return RELOC_FAILED;
326 }
327
328 /****************************************************************************/
329
330 /* ??? This does not handle endianness correctly. */
331 static void old_reloc(struct lib_info *libinfo, uint32_t rl)
332 {
333 #ifdef DEBUG
334 const char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" };
335 #endif
336 uint32_t *ptr;
337 uint32_t offset;
338 int reloc_type;
339
340 offset = rl & 0x3fffffff;
341 reloc_type = rl >> 30;
342 /* ??? How to handle this? */
343 #if defined(CONFIG_COLDFIRE)
344 ptr = (uint32_t *) ((unsigned long) libinfo->start_code + offset);
345 #else
346 ptr = (uint32_t *) ((unsigned long) libinfo->start_data + offset);
347 #endif
348
349 #ifdef DEBUG
350 fprintf(stderr, "Relocation of variable at DATASEG+%x "
351 "(address %p, currently %x) into segment %s\n",
352 offset, ptr, (int)*ptr, segment[reloc_type]);
353 #endif
354
355 switch (reloc_type) {
356 case OLD_FLAT_RELOC_TYPE_TEXT:
357 *ptr += libinfo->start_code;
358 break;
359 case OLD_FLAT_RELOC_TYPE_DATA:
360 *ptr += libinfo->start_data;
361 break;
362 case OLD_FLAT_RELOC_TYPE_BSS:
363 *ptr += libinfo->end_data;
364 break;
365 default:
366 fprintf(stderr, "BINFMT_FLAT: Unknown relocation type=%x\n",
367 reloc_type);
368 break;
369 }
370 DBG_FLT("Relocation became %x\n", (int)*ptr);
371 }
372
373 /****************************************************************************/
374
375 static int load_flat_file(struct linux_binprm * bprm,
376 struct lib_info *libinfo, int id, abi_ulong *extra_stack)
377 {
378 struct flat_hdr * hdr;
379 abi_ulong textpos = 0, datapos = 0;
380 abi_long result;
381 abi_ulong realdatastart = 0;
382 abi_ulong text_len, data_len, bss_len, stack_len, flags;
383 abi_ulong extra;
384 abi_ulong reloc = 0, rp;
385 int i, rev, relocs = 0;
386 abi_ulong fpos;
387 abi_ulong start_code;
388 abi_ulong indx_len;
389
390 hdr = ((struct flat_hdr *) bprm->buf); /* exec-header */
391
392 text_len = ntohl(hdr->data_start);
393 data_len = ntohl(hdr->data_end) - ntohl(hdr->data_start);
394 bss_len = ntohl(hdr->bss_end) - ntohl(hdr->data_end);
395 stack_len = ntohl(hdr->stack_size);
396 if (extra_stack) {
397 stack_len += *extra_stack;
398 *extra_stack = stack_len;
399 }
400 relocs = ntohl(hdr->reloc_count);
401 flags = ntohl(hdr->flags);
402 rev = ntohl(hdr->rev);
403
404 DBG_FLT("BINFMT_FLAT: Loading file: %s\n", bprm->filename);
405
406 if (rev != FLAT_VERSION && rev != OLD_FLAT_VERSION) {
407 fprintf(stderr, "BINFMT_FLAT: bad magic/rev (0x%x, need 0x%x)\n",
408 rev, (int) FLAT_VERSION);
409 return -ENOEXEC;
410 }
411
412 /* Don't allow old format executables to use shared libraries */
413 if (rev == OLD_FLAT_VERSION && id != 0) {
414 fprintf(stderr, "BINFMT_FLAT: shared libraries are not available\n");
415 return -ENOEXEC;
416 }
417
418 /*
419 * fix up the flags for the older format, there were all kinds
420 * of endian hacks, this only works for the simple cases
421 */
422 if (rev == OLD_FLAT_VERSION && flat_old_ram_flag(flags))
423 flags = FLAT_FLAG_RAM;
424
425 #ifndef CONFIG_BINFMT_ZFLAT
426 if (flags & (FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA)) {
427 fprintf(stderr, "Support for ZFLAT executables is not enabled\n");
428 return -ENOEXEC;
429 }
430 #endif
431
432 /*
433 * calculate the extra space we need to map in
434 */
435 extra = relocs * sizeof(abi_ulong);
436 if (extra < bss_len + stack_len)
437 extra = bss_len + stack_len;
438
439 /* Add space for library base pointers. Make sure this does not
440 misalign the doesn't misalign the data segment. */
441 indx_len = MAX_SHARED_LIBS * sizeof(abi_ulong);
442 indx_len = (indx_len + 15) & ~(abi_ulong)15;
443
444 /*
445 * there are a couple of cases here, the separate code/data
446 * case, and then the fully copied to RAM case which lumps
447 * it all together.
448 */
449 if ((flags & (FLAT_FLAG_RAM|FLAT_FLAG_GZIP)) == 0) {
450 /*
451 * this should give us a ROM ptr, but if it doesn't we don't
452 * really care
453 */
454 DBG_FLT("BINFMT_FLAT: ROM mapping of file (we hope)\n");
455
456 textpos = target_mmap(0, text_len, PROT_READ|PROT_EXEC,
457 MAP_PRIVATE, bprm->fd, 0);
458 if (textpos == -1) {
459 fprintf(stderr, "Unable to mmap process text\n");
460 return -1;
461 }
462
463 realdatastart = target_mmap(0, data_len + extra + indx_len,
464 PROT_READ|PROT_WRITE|PROT_EXEC,
465 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
466
467 if (realdatastart == -1) {
468 fprintf(stderr, "Unable to allocate RAM for process data\n");
469 return realdatastart;
470 }
471 datapos = realdatastart + indx_len;
472
473 DBG_FLT("BINFMT_FLAT: Allocated data+bss+stack (%d bytes): %x\n",
474 (int)(data_len + bss_len + stack_len), (int)datapos);
475
476 fpos = ntohl(hdr->data_start);
477 #ifdef CONFIG_BINFMT_ZFLAT
478 if (flags & FLAT_FLAG_GZDATA) {
479 result = decompress_exec(bprm, fpos, (char *) datapos,
480 data_len + (relocs * sizeof(abi_ulong)))
481 } else
482 #endif
483 {
484 result = target_pread(bprm->fd, datapos,
485 data_len + (relocs * sizeof(abi_ulong)),
486 fpos);
487 }
488 if (result < 0) {
489 fprintf(stderr, "Unable to read data+bss\n");
490 return result;
491 }
492
493 reloc = datapos + (ntohl(hdr->reloc_start) - text_len);
494
495 } else {
496
497 textpos = target_mmap(0, text_len + data_len + extra + indx_len,
498 PROT_READ | PROT_EXEC | PROT_WRITE,
499 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
500 if (textpos == -1 ) {
501 fprintf(stderr, "Unable to allocate RAM for process text/data\n");
502 return -1;
503 }
504
505 realdatastart = textpos + ntohl(hdr->data_start);
506 datapos = realdatastart + indx_len;
507 reloc = (textpos + ntohl(hdr->reloc_start) + indx_len);
508
509 #ifdef CONFIG_BINFMT_ZFLAT
510 #error code needs checking
511 /*
512 * load it all in and treat it like a RAM load from now on
513 */
514 if (flags & FLAT_FLAG_GZIP) {
515 result = decompress_exec(bprm, sizeof (struct flat_hdr),
516 (((char *) textpos) + sizeof (struct flat_hdr)),
517 (text_len + data_len + (relocs * sizeof(unsigned long))
518 - sizeof (struct flat_hdr)),
519 0);
520 memmove((void *) datapos, (void *) realdatastart,
521 data_len + (relocs * sizeof(unsigned long)));
522 } else if (flags & FLAT_FLAG_GZDATA) {
523 fpos = 0;
524 result = bprm->file->f_op->read(bprm->file,
525 (char *) textpos, text_len, &fpos);
526 if (!is_error(result)) {
527 result = decompress_exec(bprm, text_len, (char *) datapos,
528 data_len + (relocs * sizeof(unsigned long)), 0);
529 }
530 }
531 else
532 #endif
533 {
534 result = target_pread(bprm->fd, textpos,
535 text_len, 0);
536 if (result >= 0) {
537 result = target_pread(bprm->fd, datapos,
538 data_len + (relocs * sizeof(abi_ulong)),
539 ntohl(hdr->data_start));
540 }
541 }
542 if (result < 0) {
543 fprintf(stderr, "Unable to read code+data+bss\n");
544 return result;
545 }
546 }
547
548 DBG_FLT("Mapping is 0x%x, Entry point is 0x%x, data_start is 0x%x\n",
549 (int)textpos, 0x00ffffff&ntohl(hdr->entry),
550 ntohl(hdr->data_start));
551
552 /* The main program needs a little extra setup in the task structure */
553 start_code = textpos + sizeof (struct flat_hdr);
554
555 DBG_FLT("%s %s: TEXT=%x-%x DATA=%x-%x BSS=%x-%x\n",
556 id ? "Lib" : "Load", bprm->filename,
557 (int) start_code, (int) (textpos + text_len),
558 (int) datapos,
559 (int) (datapos + data_len),
560 (int) (datapos + data_len),
561 (int) (((datapos + data_len + bss_len) + 3) & ~3));
562
563 text_len -= sizeof(struct flat_hdr); /* the real code len */
564
565 /* Store the current module values into the global library structure */
566 libinfo[id].start_code = start_code;
567 libinfo[id].start_data = datapos;
568 libinfo[id].end_data = datapos + data_len;
569 libinfo[id].start_brk = datapos + data_len + bss_len;
570 libinfo[id].text_len = text_len;
571 libinfo[id].loaded = 1;
572 libinfo[id].entry = (0x00ffffff & ntohl(hdr->entry)) + textpos;
573 libinfo[id].build_date = ntohl(hdr->build_date);
574
575 /*
576 * We just load the allocations into some temporary memory to
577 * help simplify all this mumbo jumbo
578 *
579 * We've got two different sections of relocation entries.
580 * The first is the GOT which resides at the beginning of the data segment
581 * and is terminated with a -1. This one can be relocated in place.
582 * The second is the extra relocation entries tacked after the image's
583 * data segment. These require a little more processing as the entry is
584 * really an offset into the image which contains an offset into the
585 * image.
586 */
587 if (flags & FLAT_FLAG_GOTPIC) {
588 rp = datapos;
589 while (1) {
590 abi_ulong addr;
591 if (get_user_ual(addr, rp))
592 return -EFAULT;
593 if (addr == -1)
594 break;
595 if (addr) {
596 addr = calc_reloc(addr, libinfo, id, 0);
597 if (addr == RELOC_FAILED)
598 return -ENOEXEC;
599 if (put_user_ual(addr, rp))
600 return -EFAULT;
601 }
602 rp += sizeof(abi_ulong);
603 }
604 }
605
606 /*
607 * Now run through the relocation entries.
608 * We've got to be careful here as C++ produces relocatable zero
609 * entries in the constructor and destructor tables which are then
610 * tested for being not zero (which will always occur unless we're
611 * based from address zero). This causes an endless loop as __start
612 * is at zero. The solution used is to not relocate zero addresses.
613 * This has the negative side effect of not allowing a global data
614 * reference to be statically initialised to _stext (I've moved
615 * __start to address 4 so that is okay).
616 */
617 if (rev > OLD_FLAT_VERSION) {
618 abi_ulong persistent = 0;
619 for (i = 0; i < relocs; i++) {
620 abi_ulong addr, relval;
621
622 /* Get the address of the pointer to be
623 relocated (of course, the address has to be
624 relocated first). */
625 if (get_user_ual(relval, reloc + i * sizeof(abi_ulong)))
626 return -EFAULT;
627 relval = ntohl(relval);
628 if (flat_set_persistent(relval, &persistent))
629 continue;
630 addr = flat_get_relocate_addr(relval);
631 rp = calc_reloc(addr, libinfo, id, 1);
632 if (rp == RELOC_FAILED)
633 return -ENOEXEC;
634
635 /* Get the pointer's value. */
636 if (get_user_ual(addr, rp))
637 return -EFAULT;
638 addr = flat_get_addr_from_rp(addr, relval, flags, &persistent);
639 if (addr != 0) {
640 /*
641 * Do the relocation. PIC relocs in the data section are
642 * already in target order
643 */
644 if ((flags & FLAT_FLAG_GOTPIC) == 0)
645 addr = ntohl(addr);
646 addr = calc_reloc(addr, libinfo, id, 0);
647 if (addr == RELOC_FAILED)
648 return -ENOEXEC;
649
650 /* Write back the relocated pointer. */
651 if (flat_put_addr_at_rp(rp, addr, relval))
652 return -EFAULT;
653 }
654 }
655 } else {
656 for (i = 0; i < relocs; i++) {
657 abi_ulong relval;
658 if (get_user_ual(relval, reloc + i * sizeof(abi_ulong)))
659 return -EFAULT;
660 old_reloc(&libinfo[0], relval);
661 }
662 }
663
664 /* zero the BSS. */
665 memset(g2h(datapos + data_len), 0, bss_len);
666
667 return 0;
668 }
669
670
671 /****************************************************************************/
672 #ifdef CONFIG_BINFMT_SHARED_FLAT
673
674 /*
675 * Load a shared library into memory. The library gets its own data
676 * segment (including bss) but not argv/argc/environ.
677 */
678
679 static int load_flat_shared_library(int id, struct lib_info *libs)
680 {
681 struct linux_binprm bprm;
682 int res;
683 char buf[16];
684
685 /* Create the file name */
686 sprintf(buf, "/lib/lib%d.so", id);
687
688 /* Open the file up */
689 bprm.filename = buf;
690 bprm.file = open_exec(bprm.filename);
691 res = PTR_ERR(bprm.file);
692 if (IS_ERR(bprm.file))
693 return res;
694
695 res = prepare_binprm(&bprm);
696
697 if (!is_error(res)) {
698 res = load_flat_file(&bprm, libs, id, NULL);
699 }
700 if (bprm.file) {
701 allow_write_access(bprm.file);
702 fput(bprm.file);
703 bprm.file = NULL;
704 }
705 return(res);
706 }
707
708 #endif /* CONFIG_BINFMT_SHARED_FLAT */
709
710 int load_flt_binary(struct linux_binprm *bprm, struct image_info *info)
711 {
712 struct lib_info libinfo[MAX_SHARED_LIBS];
713 abi_ulong p;
714 abi_ulong stack_len;
715 abi_ulong start_addr;
716 abi_ulong sp;
717 int res;
718 int i, j;
719
720 memset(libinfo, 0, sizeof(libinfo));
721 /*
722 * We have to add the size of our arguments to our stack size
723 * otherwise it's too easy for users to create stack overflows
724 * by passing in a huge argument list. And yes, we have to be
725 * pedantic and include space for the argv/envp array as it may have
726 * a lot of entries.
727 */
728 stack_len = 0;
729 for (i = 0; i < bprm->argc; ++i) {
730 /* the argv strings */
731 stack_len += strlen(bprm->argv[i]);
732 }
733 for (i = 0; i < bprm->envc; ++i) {
734 /* the envp strings */
735 stack_len += strlen(bprm->envp[i]);
736 }
737 stack_len += (bprm->argc + 1) * 4; /* the argv array */
738 stack_len += (bprm->envc + 1) * 4; /* the envp array */
739
740
741 res = load_flat_file(bprm, libinfo, 0, &stack_len);
742 if (is_error(res)) {
743 return res;
744 }
745
746 /* Update data segment pointers for all libraries */
747 for (i=0; i<MAX_SHARED_LIBS; i++) {
748 if (libinfo[i].loaded) {
749 abi_ulong p;
750 p = libinfo[i].start_data;
751 for (j=0; j<MAX_SHARED_LIBS; j++) {
752 p -= 4;
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;
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. */
767 p = copy_strings(p, bprm->envc, bprm->envp);
768 p = copy_strings(p, bprm->argc, bprm->argv);
769 /* Align stack. */
770 sp = p & ~(abi_ulong)(sizeof(abi_ulong) - 1);
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 += flat_argvp_envp_on_stack() ? 2 : 0; /* arvg, argp */
775 stack_len += 1; /* argc */
776 stack_len *= sizeof(abi_ulong);
777 sp -= (sp - stack_len) & 15;
778 sp = loader_build_argptr(bprm->envc, bprm->argc, sp, p,
779 flat_argvp_envp_on_stack());
780
781 /* Fake some return addresses to ensure the call chain will
782 * initialise library in order for us. We are required to call
783 * lib 1 first, then 2, ... and finally the main program (id 0).
784 */
785 start_addr = libinfo[0].entry;
786
787 #ifdef CONFIG_BINFMT_SHARED_FLAT
788 #error here
789 for (i = MAX_SHARED_LIBS-1; i>0; i--) {
790 if (libinfo[i].loaded) {
791 /* Push previos first to call address */
792 --sp;
793 if (put_user_ual(start_addr, sp))
794 return -EFAULT;
795 start_addr = libinfo[i].entry;
796 }
797 }
798 #endif
799
800 /* Stash our initial stack pointer into the mm structure */
801 info->start_code = libinfo[0].start_code;
802 info->end_code = libinfo[0].start_code = libinfo[0].text_len;
803 info->start_data = libinfo[0].start_data;
804 info->end_data = libinfo[0].end_data;
805 info->start_brk = libinfo[0].start_brk;
806 info->start_stack = sp;
807 info->stack_limit = libinfo[0].start_brk;
808 info->entry = start_addr;
809 info->code_offset = info->start_code;
810 info->data_offset = info->start_data - libinfo[0].text_len;
811
812 DBG_FLT("start_thread(entry=0x%x, start_stack=0x%x)\n",
813 (int)info->entry, (int)info->start_stack);
814
815 return 0;
816 }