Temporary workaround for ppc on ppc
[qemu-kvm/fedora.git] / linux-user / flatload.c
blob00e0312691ef3d567b9220dc00bff1dec90ff9cc
1 /****************************************************************************/
2 /*
3 * QEMU bFLT binary loader. Based on linux/fs/binfmt_flat.c
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.
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.
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., 51 Franklin Street - Fifth Floor, Boston,
18 * MA 02110-1301, USA.
20 * Copyright (C) 2006 CodeSourcery.
21 * Copyright (C) 2000-2003 David McCullough <davidm@snapgear.com>
22 * Copyright (C) 2002 Greg Ungerer <gerg@snapgear.com>
23 * Copyright (C) 2002 SnapGear, by Paul Dale <pauli@snapgear.com>
24 * Copyright (C) 2000, 2001 Lineo, by David McCullough <davidm@lineo.com>
25 * based heavily on:
27 * linux/fs/binfmt_aout.c:
28 * Copyright (C) 1991, 1992, 1996 Linus Torvalds
29 * linux/fs/binfmt_flat.c for 2.0 kernel
30 * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com>
31 * JAN/99 -- coded full program relocation (gerg@snapgear.com)
34 /* ??? ZFLAT and shared library support is currently disabled. */
36 /****************************************************************************/
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <errno.h>
41 #include <sys/mman.h>
42 #include <unistd.h>
44 #include "qemu.h"
45 #include "flat.h"
47 //#define DEBUG
49 #ifdef DEBUG
50 #define DBG_FLT(a...) printf(a)
51 #else
52 #define DBG_FLT(a...)
53 #endif
55 #define flat_reloc_valid(reloc, size) ((reloc) <= (size))
56 #define flat_old_ram_flag(flag) (flag)
57 #ifdef TARGET_WORDS_BIGENDIAN
58 #define flat_get_relocate_addr(relval) (relval)
59 #else
60 #define flat_get_relocate_addr(relval) bswap32(relval)
61 #endif
63 #define RELOC_FAILED 0xff00ff01 /* Relocation incorrect somewhere */
64 #define UNLOADED_LIB 0x7ff000ff /* Placeholder for unused library */
66 struct lib_info {
67 abi_ulong start_code; /* Start of text segment */
68 abi_ulong start_data; /* Start of data segment */
69 abi_ulong end_data; /* Start of bss section */
70 abi_ulong start_brk; /* End of data segment */
71 abi_ulong text_len; /* Length of text segment */
72 abi_ulong entry; /* Start address for this module */
73 abi_ulong build_date; /* When this one was compiled */
74 short loaded; /* Has this library been loaded? */
77 #ifdef CONFIG_BINFMT_SHARED_FLAT
78 static int load_flat_shared_library(int id, struct lib_info *p);
79 #endif
81 struct linux_binprm;
83 #define ntohl(x) be32_to_cpu(x)
85 /****************************************************************************/
87 * create_flat_tables() parses the env- and arg-strings in new user
88 * memory and creates the pointer tables from them, and puts their
89 * addresses on the "stack", returning the new stack pointer value.
92 /* Push a block of strings onto the guest stack. */
93 static abi_ulong copy_strings(abi_ulong p, int n, char **s)
95 int len;
97 while (n-- > 0) {
98 len = strlen(s[n]) + 1;
99 p -= len;
100 memcpy_to_target(p, s[n], len);
103 return p;
106 static int target_pread(int fd, abi_ulong ptr, abi_ulong len,
107 abi_ulong offset)
109 void *buf;
110 int ret;
112 buf = lock_user(VERIFY_WRITE, ptr, len, 0);
113 ret = pread(fd, buf, len, offset);
114 unlock_user(buf, ptr, len);
115 return ret;
117 /****************************************************************************/
119 #ifdef CONFIG_BINFMT_ZFLAT
121 #include <linux/zlib.h>
123 #define LBUFSIZE 4000
125 /* gzip flag byte */
126 #define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */
127 #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
128 #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
129 #define ORIG_NAME 0x08 /* bit 3 set: original file name present */
130 #define COMMENT 0x10 /* bit 4 set: file comment present */
131 #define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
132 #define RESERVED 0xC0 /* bit 6,7: reserved */
134 static int decompress_exec(
135 struct linux_binprm *bprm,
136 unsigned long offset,
137 char *dst,
138 long len,
139 int fd)
141 unsigned char *buf;
142 z_stream strm;
143 loff_t fpos;
144 int ret, retval;
146 DBG_FLT("decompress_exec(offset=%x,buf=%x,len=%x)\n",(int)offset, (int)dst, (int)len);
148 memset(&strm, 0, sizeof(strm));
149 strm.workspace = kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL);
150 if (strm.workspace == NULL) {
151 DBG_FLT("binfmt_flat: no memory for decompress workspace\n");
152 return -ENOMEM;
154 buf = kmalloc(LBUFSIZE, GFP_KERNEL);
155 if (buf == NULL) {
156 DBG_FLT("binfmt_flat: no memory for read buffer\n");
157 retval = -ENOMEM;
158 goto out_free;
161 /* Read in first chunk of data and parse gzip header. */
162 fpos = offset;
163 ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos);
165 strm.next_in = buf;
166 strm.avail_in = ret;
167 strm.total_in = 0;
169 retval = -ENOEXEC;
171 /* Check minimum size -- gzip header */
172 if (ret < 10) {
173 DBG_FLT("binfmt_flat: file too small?\n");
174 goto out_free_buf;
177 /* Check gzip magic number */
178 if ((buf[0] != 037) || ((buf[1] != 0213) && (buf[1] != 0236))) {
179 DBG_FLT("binfmt_flat: unknown compression magic?\n");
180 goto out_free_buf;
183 /* Check gzip method */
184 if (buf[2] != 8) {
185 DBG_FLT("binfmt_flat: unknown compression method?\n");
186 goto out_free_buf;
188 /* Check gzip flags */
189 if ((buf[3] & ENCRYPTED) || (buf[3] & CONTINUATION) ||
190 (buf[3] & RESERVED)) {
191 DBG_FLT("binfmt_flat: unknown flags?\n");
192 goto out_free_buf;
195 ret = 10;
196 if (buf[3] & EXTRA_FIELD) {
197 ret += 2 + buf[10] + (buf[11] << 8);
198 if (unlikely(LBUFSIZE == ret)) {
199 DBG_FLT("binfmt_flat: buffer overflow (EXTRA)?\n");
200 goto out_free_buf;
203 if (buf[3] & ORIG_NAME) {
204 for (; ret < LBUFSIZE && (buf[ret] != 0); ret++)
206 if (unlikely(LBUFSIZE == ret)) {
207 DBG_FLT("binfmt_flat: buffer overflow (ORIG_NAME)?\n");
208 goto out_free_buf;
211 if (buf[3] & COMMENT) {
212 for (; ret < LBUFSIZE && (buf[ret] != 0); ret++)
214 if (unlikely(LBUFSIZE == ret)) {
215 DBG_FLT("binfmt_flat: buffer overflow (COMMENT)?\n");
216 goto out_free_buf;
220 strm.next_in += ret;
221 strm.avail_in -= ret;
223 strm.next_out = dst;
224 strm.avail_out = len;
225 strm.total_out = 0;
227 if (zlib_inflateInit2(&strm, -MAX_WBITS) != Z_OK) {
228 DBG_FLT("binfmt_flat: zlib init failed?\n");
229 goto out_free_buf;
232 while ((ret = zlib_inflate(&strm, Z_NO_FLUSH)) == Z_OK) {
233 ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos);
234 if (ret <= 0)
235 break;
236 if (ret >= (unsigned long) -4096)
237 break;
238 len -= ret;
240 strm.next_in = buf;
241 strm.avail_in = ret;
242 strm.total_in = 0;
245 if (ret < 0) {
246 DBG_FLT("binfmt_flat: decompression failed (%d), %s\n",
247 ret, strm.msg);
248 goto out_zlib;
251 retval = 0;
252 out_zlib:
253 zlib_inflateEnd(&strm);
254 out_free_buf:
255 kfree(buf);
256 out_free:
257 kfree(strm.workspace);
258 out:
259 return retval;
262 #endif /* CONFIG_BINFMT_ZFLAT */
264 /****************************************************************************/
266 static abi_ulong
267 calc_reloc(abi_ulong r, struct lib_info *p, int curid, int internalp)
269 abi_ulong addr;
270 int id;
271 abi_ulong start_brk;
272 abi_ulong start_data;
273 abi_ulong text_len;
274 abi_ulong start_code;
276 #ifdef CONFIG_BINFMT_SHARED_FLAT
277 #error needs checking
278 if (r == 0)
279 id = curid; /* Relocs of 0 are always self referring */
280 else {
281 id = (r >> 24) & 0xff; /* Find ID for this reloc */
282 r &= 0x00ffffff; /* Trim ID off here */
284 if (id >= MAX_SHARED_LIBS) {
285 fprintf(stderr, "BINFMT_FLAT: reference 0x%x to shared library %d\n",
286 (unsigned) r, id);
287 goto failed;
289 if (curid != id) {
290 if (internalp) {
291 fprintf(stderr, "BINFMT_FLAT: reloc address 0x%x not "
292 "in same module (%d != %d)\n",
293 (unsigned) r, curid, id);
294 goto failed;
295 } else if ( ! p[id].loaded &&
296 load_flat_shared_library(id, p) > (unsigned long) -4096) {
297 fprintf(stderr, "BINFMT_FLAT: failed to load library %d\n", id);
298 goto failed;
300 /* Check versioning information (i.e. time stamps) */
301 if (p[id].build_date && p[curid].build_date
302 && p[curid].build_date < p[id].build_date) {
303 fprintf(stderr, "BINFMT_FLAT: library %d is younger than %d\n",
304 id, curid);
305 goto failed;
308 #else
309 id = 0;
310 #endif
312 start_brk = p[id].start_brk;
313 start_data = p[id].start_data;
314 start_code = p[id].start_code;
315 text_len = p[id].text_len;
317 if (!flat_reloc_valid(r, start_brk - start_data + text_len)) {
318 fprintf(stderr, "BINFMT_FLAT: reloc outside program 0x%x "
319 "(0 - 0x%x/0x%x)\n",
320 (int) r,(int)(start_brk-start_code),(int)text_len);
321 goto failed;
324 if (r < text_len) /* In text segment */
325 addr = r + start_code;
326 else /* In data segment */
327 addr = r - text_len + start_data;
329 /* Range checked already above so doing the range tests is redundant...*/
330 return(addr);
332 failed:
333 abort();
334 return RELOC_FAILED;
337 /****************************************************************************/
339 /* ??? This does not handle endianness correctly. */
340 static void old_reloc(struct lib_info *libinfo, uint32_t rl)
342 #ifdef DEBUG
343 char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" };
344 #endif
345 uint32_t *ptr;
346 uint32_t offset;
347 int reloc_type;
349 offset = rl & 0x3fffffff;
350 reloc_type = rl >> 30;
351 /* ??? How to handle this? */
352 #if defined(CONFIG_COLDFIRE)
353 ptr = (uint32_t *) ((unsigned long) libinfo->start_code + offset);
354 #else
355 ptr = (uint32_t *) ((unsigned long) libinfo->start_data + offset);
356 #endif
358 #ifdef DEBUG
359 fprintf(stderr, "Relocation of variable at DATASEG+%x "
360 "(address %p, currently %x) into segment %s\n",
361 offset, ptr, (int)*ptr, segment[reloc_type]);
362 #endif
364 switch (reloc_type) {
365 case OLD_FLAT_RELOC_TYPE_TEXT:
366 *ptr += libinfo->start_code;
367 break;
368 case OLD_FLAT_RELOC_TYPE_DATA:
369 *ptr += libinfo->start_data;
370 break;
371 case OLD_FLAT_RELOC_TYPE_BSS:
372 *ptr += libinfo->end_data;
373 break;
374 default:
375 fprintf(stderr, "BINFMT_FLAT: Unknown relocation type=%x\n",
376 reloc_type);
377 break;
379 DBG_FLT("Relocation became %x\n", (int)*ptr);
382 /****************************************************************************/
384 static int load_flat_file(struct linux_binprm * bprm,
385 struct lib_info *libinfo, int id, abi_ulong *extra_stack)
387 struct flat_hdr * hdr;
388 abi_ulong textpos = 0, datapos = 0, result;
389 abi_ulong realdatastart = 0;
390 abi_ulong text_len, data_len, bss_len, stack_len, flags;
391 abi_ulong memp = 0; /* for finding the brk area */
392 abi_ulong extra;
393 abi_ulong reloc = 0, rp;
394 int i, rev, relocs = 0;
395 abi_ulong fpos;
396 abi_ulong start_code, end_code;
397 abi_ulong indx_len;
399 hdr = ((struct flat_hdr *) bprm->buf); /* exec-header */
401 text_len = ntohl(hdr->data_start);
402 data_len = ntohl(hdr->data_end) - ntohl(hdr->data_start);
403 bss_len = ntohl(hdr->bss_end) - ntohl(hdr->data_end);
404 stack_len = ntohl(hdr->stack_size);
405 if (extra_stack) {
406 stack_len += *extra_stack;
407 *extra_stack = stack_len;
409 relocs = ntohl(hdr->reloc_count);
410 flags = ntohl(hdr->flags);
411 rev = ntohl(hdr->rev);
413 DBG_FLT("BINFMT_FLAT: Loading file: %s\n", bprm->filename);
415 if (rev != FLAT_VERSION && rev != OLD_FLAT_VERSION) {
416 fprintf(stderr, "BINFMT_FLAT: bad magic/rev (0x%x, need 0x%x)\n",
417 rev, (int) FLAT_VERSION);
418 return -ENOEXEC;
421 /* Don't allow old format executables to use shared libraries */
422 if (rev == OLD_FLAT_VERSION && id != 0) {
423 fprintf(stderr, "BINFMT_FLAT: shared libraries are not available\n");
424 return -ENOEXEC;
428 * fix up the flags for the older format, there were all kinds
429 * of endian hacks, this only works for the simple cases
431 if (rev == OLD_FLAT_VERSION && flat_old_ram_flag(flags))
432 flags = FLAT_FLAG_RAM;
434 #ifndef CONFIG_BINFMT_ZFLAT
435 if (flags & (FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA)) {
436 fprintf(stderr, "Support for ZFLAT executables is not enabled\n");
437 return -ENOEXEC;
439 #endif
442 * calculate the extra space we need to map in
444 extra = relocs * sizeof(abi_ulong);
445 if (extra < bss_len + stack_len)
446 extra = bss_len + stack_len;
448 /* Add space for library base pointers. Make sure this does not
449 misalign the doesn't misalign the data segment. */
450 indx_len = MAX_SHARED_LIBS * sizeof(abi_ulong);
451 indx_len = (indx_len + 15) & ~(abi_ulong)15;
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.
458 if ((flags & (FLAT_FLAG_RAM|FLAT_FLAG_GZIP)) == 0) {
460 * this should give us a ROM ptr, but if it doesn't we don't
461 * really care
463 DBG_FLT("BINFMT_FLAT: ROM mapping of file (we hope)\n");
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;
472 realdatastart = target_mmap(0, data_len + extra + indx_len,
473 PROT_READ|PROT_WRITE|PROT_EXEC,
474 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
476 if (realdatastart == -1) {
477 fprintf(stderr, "Unable to allocate RAM for process data\n");
478 return realdatastart;
480 datapos = realdatastart + indx_len;
482 DBG_FLT("BINFMT_FLAT: Allocated data+bss+stack (%d bytes): %x\n",
483 (int)(data_len + bss_len + stack_len), (int)datapos);
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
493 result = target_pread(bprm->fd, datapos,
494 data_len + (relocs * sizeof(abi_ulong)),
495 fpos);
497 if (result < 0) {
498 fprintf(stderr, "Unable to read data+bss\n");
499 return result;
502 reloc = datapos + (ntohl(hdr->reloc_start) - text_len);
503 memp = realdatastart;
505 } else {
507 textpos = target_mmap(0, text_len + data_len + extra + indx_len,
508 PROT_READ | PROT_EXEC | PROT_WRITE,
509 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
510 if (textpos == -1 ) {
511 fprintf(stderr, "Unable to allocate RAM for process text/data\n");
512 return -1;
515 realdatastart = textpos + ntohl(hdr->data_start);
516 datapos = realdatastart + indx_len;
517 reloc = (textpos + ntohl(hdr->reloc_start) + indx_len);
518 memp = textpos;
520 #ifdef CONFIG_BINFMT_ZFLAT
521 #error code needs checking
523 * load it all in and treat it like a RAM load from now on
525 if (flags & FLAT_FLAG_GZIP) {
526 result = decompress_exec(bprm, sizeof (struct flat_hdr),
527 (((char *) textpos) + sizeof (struct flat_hdr)),
528 (text_len + data_len + (relocs * sizeof(unsigned long))
529 - sizeof (struct flat_hdr)),
531 memmove((void *) datapos, (void *) realdatastart,
532 data_len + (relocs * sizeof(unsigned long)));
533 } else if (flags & FLAT_FLAG_GZDATA) {
534 fpos = 0;
535 result = bprm->file->f_op->read(bprm->file,
536 (char *) textpos, text_len, &fpos);
537 if (result < (unsigned long) -4096)
538 result = decompress_exec(bprm, text_len, (char *) datapos,
539 data_len + (relocs * sizeof(unsigned long)), 0);
541 else
542 #endif
544 result = target_pread(bprm->fd, textpos,
545 text_len, 0);
546 if (result >= 0) {
547 result = target_pread(bprm->fd, datapos,
548 data_len + (relocs * sizeof(abi_ulong)),
549 ntohl(hdr->data_start));
552 if (result < 0) {
553 fprintf(stderr, "Unable to read code+data+bss\n");
554 return result;
558 DBG_FLT("Mapping is 0x%x, Entry point is 0x%x, data_start is 0x%x\n",
559 (int)textpos, 0x00ffffff&ntohl(hdr->entry),
560 ntohl(hdr->data_start));
562 /* The main program needs a little extra setup in the task structure */
563 start_code = textpos + sizeof (struct flat_hdr);
564 end_code = textpos + text_len;
566 DBG_FLT("%s %s: TEXT=%x-%x DATA=%x-%x BSS=%x-%x\n",
567 id ? "Lib" : "Load", bprm->filename,
568 (int) start_code, (int) end_code,
569 (int) datapos,
570 (int) (datapos + data_len),
571 (int) (datapos + data_len),
572 (int) (((datapos + data_len + bss_len) + 3) & ~3));
574 text_len -= sizeof(struct flat_hdr); /* the real code len */
576 /* Store the current module values into the global library structure */
577 libinfo[id].start_code = start_code;
578 libinfo[id].start_data = datapos;
579 libinfo[id].end_data = datapos + data_len;
580 libinfo[id].start_brk = datapos + data_len + bss_len;
581 libinfo[id].text_len = text_len;
582 libinfo[id].loaded = 1;
583 libinfo[id].entry = (0x00ffffff & ntohl(hdr->entry)) + textpos;
584 libinfo[id].build_date = ntohl(hdr->build_date);
587 * We just load the allocations into some temporary memory to
588 * help simplify all this mumbo jumbo
590 * We've got two different sections of relocation entries.
591 * The first is the GOT which resides at the begining of the data segment
592 * and is terminated with a -1. This one can be relocated in place.
593 * The second is the extra relocation entries tacked after the image's
594 * data segment. These require a little more processing as the entry is
595 * really an offset into the image which contains an offset into the
596 * image.
598 if (flags & FLAT_FLAG_GOTPIC) {
599 rp = datapos;
600 while (1) {
601 abi_ulong addr;
602 if (get_user_ual(addr, rp))
603 return -EFAULT;
604 if (addr == -1)
605 break;
606 if (addr) {
607 addr = calc_reloc(addr, libinfo, id, 0);
608 if (addr == RELOC_FAILED)
609 return -ENOEXEC;
610 if (put_user_ual(addr, rp))
611 return -EFAULT;
613 rp += sizeof(abi_ulong);
618 * Now run through the relocation entries.
619 * We've got to be careful here as C++ produces relocatable zero
620 * entries in the constructor and destructor tables which are then
621 * tested for being not zero (which will always occur unless we're
622 * based from address zero). This causes an endless loop as __start
623 * is at zero. The solution used is to not relocate zero addresses.
624 * This has the negative side effect of not allowing a global data
625 * reference to be statically initialised to _stext (I've moved
626 * __start to address 4 so that is okay).
628 if (rev > OLD_FLAT_VERSION) {
629 for (i = 0; i < relocs; i++) {
630 abi_ulong addr, relval;
632 /* Get the address of the pointer to be
633 relocated (of course, the address has to be
634 relocated first). */
635 if (get_user_ual(relval, reloc + i * sizeof(abi_ulong)))
636 return -EFAULT;
637 addr = flat_get_relocate_addr(relval);
638 rp = calc_reloc(addr, libinfo, id, 1);
639 if (rp == RELOC_FAILED)
640 return -ENOEXEC;
642 /* Get the pointer's value. */
643 if (get_user_ual(addr, rp))
644 return -EFAULT;
645 if (addr != 0) {
647 * Do the relocation. PIC relocs in the data section are
648 * already in target order
651 #ifndef TARGET_WORDS_BIGENDIAN
652 if ((flags & FLAT_FLAG_GOTPIC) == 0)
653 addr = bswap32(addr);
654 #endif
655 addr = calc_reloc(addr, libinfo, id, 0);
656 if (addr == RELOC_FAILED)
657 return -ENOEXEC;
659 /* Write back the relocated pointer. */
660 if (put_user_ual(addr, rp))
661 return -EFAULT;
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);
673 /* zero the BSS. */
674 memset((void *)((unsigned long)datapos + data_len), 0, bss_len);
676 return 0;
680 /****************************************************************************/
681 #ifdef CONFIG_BINFMT_SHARED_FLAT
684 * Load a shared library into memory. The library gets its own data
685 * segment (including bss) but not argv/argc/environ.
688 static int load_flat_shared_library(int id, struct lib_info *libs)
690 struct linux_binprm bprm;
691 int res;
692 char buf[16];
694 /* Create the file name */
695 sprintf(buf, "/lib/lib%d.so", id);
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;
704 res = prepare_binprm(&bprm);
706 if (res <= (unsigned long)-4096)
707 res = load_flat_file(&bprm, libs, id, NULL);
708 if (bprm.file) {
709 allow_write_access(bprm.file);
710 fput(bprm.file);
711 bprm.file = NULL;
713 return(res);
716 #endif /* CONFIG_BINFMT_SHARED_FLAT */
718 int load_flt_binary(struct linux_binprm * bprm, struct target_pt_regs * regs,
719 struct image_info * info)
721 struct lib_info libinfo[MAX_SHARED_LIBS];
722 abi_ulong p = bprm->p;
723 abi_ulong stack_len;
724 abi_ulong start_addr;
725 abi_ulong sp;
726 int res;
727 int i, j;
729 memset(libinfo, 0, sizeof(libinfo));
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.
737 #define TOP_OF_ARGS (TARGET_PAGE_SIZE * MAX_ARG_PAGES - sizeof(void *))
738 stack_len = TOP_OF_ARGS - bprm->p; /* the strings */
739 stack_len += (bprm->argc + 1) * 4; /* the argv array */
740 stack_len += (bprm->envc + 1) * 4; /* the envp array */
743 res = load_flat_file(bprm, libinfo, 0, &stack_len);
744 if (res > (unsigned long)-4096)
745 return res;
747 /* Update data segment pointers for all libraries */
748 for (i=0; i<MAX_SHARED_LIBS; i++) {
749 if (libinfo[i].loaded) {
750 abi_ulong p;
751 p = libinfo[i].start_data;
752 for (j=0; j<MAX_SHARED_LIBS; j++) {
753 p -= 4;
754 /* FIXME - handle put_user() failures */
755 if (put_user_ual(libinfo[j].loaded
756 ? libinfo[j].start_data
757 : UNLOADED_LIB,
759 return -EFAULT;
764 p = ((libinfo[0].start_brk + stack_len + 3) & ~3) - 4;
765 DBG_FLT("p=%x\n", (int)p);
767 /* Copy argv/envp. */
768 p = copy_strings(p, bprm->envc, bprm->envp);
769 p = copy_strings(p, bprm->argc, bprm->argv);
770 /* Align stack. */
771 sp = p & ~(abi_ulong)(sizeof(abi_ulong) - 1);
772 /* Enforce final stack alignment of 16 bytes. This is sufficient
773 for all current targets, and excess alignment is harmless. */
774 stack_len = bprm->envc + bprm->argc + 2;
775 stack_len += 3; /* argc, arvg, argp */
776 stack_len *= sizeof(abi_ulong);
777 if ((sp + stack_len) & 15)
778 sp -= 16 - ((sp + stack_len) & 15);
779 sp = loader_build_argptr(bprm->envc, bprm->argc, sp, p, 1);
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).
785 start_addr = libinfo[0].entry;
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;
798 #endif
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->entry = start_addr;
808 info->code_offset = info->start_code;
809 info->data_offset = info->start_data - libinfo[0].text_len;
811 DBG_FLT("start_thread(entry=0x%x, start_stack=0x%x)\n",
812 (int)info->entry, (int)info->start_stack);
814 return 0;