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1.1 root 1: /****************************************************************************/
2: /*
3: * QEMU bFLT binary loader. Based on linux/fs/binfmt_flat.c
4: *
5: * This program is free software; you can redistribute it and/or modify
6: * it under the terms of the GNU General Public License as published by
7: * the Free Software Foundation; either version 2 of the License, or
8: * (at your option) any later version.
9: *
10: * This program is distributed in the hope that it will be useful,
11: * but WITHOUT ANY WARRANTY; without even the implied warranty of
12: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13: * GNU General Public License for more details.
14: *
15: * You should have received a copy of the GNU General Public License
16: * along with this program; if not, write to the Free Software
17: * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18: *
19: * Copyright (C) 2006 CodeSourcery.
20: * Copyright (C) 2000-2003 David McCullough <[email protected]>
21: * Copyright (C) 2002 Greg Ungerer <[email protected]>
22: * Copyright (C) 2002 SnapGear, by Paul Dale <[email protected]>
23: * Copyright (C) 2000, 2001 Lineo, by David McCullough <[email protected]>
24: * based heavily on:
25: *
26: * linux/fs/binfmt_aout.c:
27: * Copyright (C) 1991, 1992, 1996 Linus Torvalds
28: * linux/fs/binfmt_flat.c for 2.0 kernel
29: * Copyright (C) 1998 Kenneth Albanowski <[email protected]>
30: * JAN/99 -- coded full program relocation ([email protected])
31: */
32:
33: /* ??? ZFLAT and shared library support is currently disabled. */
34:
35: /****************************************************************************/
36:
37: #include <stdio.h>
38: #include <stdlib.h>
39: #include <errno.h>
40: #include <sys/mman.h>
41: #include <unistd.h>
42:
43: #include "qemu.h"
44: #include "flat.h"
45:
46: //#define DEBUG
47:
48: #ifdef DEBUG
49: #define DBG_FLT(a...) printf(a)
50: #else
51: #define DBG_FLT(a...)
52: #endif
53:
54: #define flat_reloc_valid(reloc, size) ((reloc) <= (size))
55: #define flat_old_ram_flag(flag) (flag)
56: #ifdef TARGET_WORDS_BIGENDIAN
57: #define flat_get_relocate_addr(relval) (relval)
58: #else
59: #define flat_get_relocate_addr(relval) bswap32(relval)
60: #endif
61:
62: #define RELOC_FAILED 0xff00ff01 /* Relocation incorrect somewhere */
63: #define UNLOADED_LIB 0x7ff000ff /* Placeholder for unused library */
64:
65: struct lib_info {
66: target_ulong start_code; /* Start of text segment */
67: target_ulong start_data; /* Start of data segment */
68: target_ulong end_data; /* Start of bss section */
69: target_ulong start_brk; /* End of data segment */
70: target_ulong text_len; /* Length of text segment */
71: target_ulong entry; /* Start address for this module */
72: target_ulong build_date; /* When this one was compiled */
73: short loaded; /* Has this library been loaded? */
74: };
75:
76: #ifdef CONFIG_BINFMT_SHARED_FLAT
77: static int load_flat_shared_library(int id, struct lib_info *p);
78: #endif
79:
80: struct linux_binprm;
81:
82: #define ntohl(x) be32_to_cpu(x)
83:
84: /****************************************************************************/
85: /*
86: * create_flat_tables() parses the env- and arg-strings in new user
87: * memory and creates the pointer tables from them, and puts their
88: * addresses on the "stack", returning the new stack pointer value.
89: */
90:
91: /* Push a block of strings onto the guest stack. */
92: static target_ulong copy_strings(target_ulong p, int n, char **s)
93: {
94: int len;
95:
96: while (n-- > 0) {
97: len = strlen(s[n]) + 1;
98: p -= len;
99: memcpy_to_target(p, s[n], len);
100: }
101:
102: return p;
103: }
104:
105: int target_pread(int fd, target_ulong ptr, target_ulong len,
106: target_ulong offset)
107: {
108: void *buf;
109: int ret;
110:
111: buf = lock_user(ptr, len, 0);
112: ret = pread(fd, buf, len, offset);
113: unlock_user(buf, ptr, len);
114: return ret;
115: }
116: /****************************************************************************/
117:
118: #ifdef CONFIG_BINFMT_ZFLAT
119:
120: #include <linux/zlib.h>
121:
122: #define LBUFSIZE 4000
123:
124: /* gzip flag byte */
125: #define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */
126: #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
127: #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
128: #define ORIG_NAME 0x08 /* bit 3 set: original file name present */
129: #define COMMENT 0x10 /* bit 4 set: file comment present */
130: #define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
131: #define RESERVED 0xC0 /* bit 6,7: reserved */
132:
133: static int decompress_exec(
134: struct linux_binprm *bprm,
135: unsigned long offset,
136: char *dst,
137: long len,
138: int fd)
139: {
140: unsigned char *buf;
141: z_stream strm;
142: loff_t fpos;
143: int ret, retval;
144:
145: DBG_FLT("decompress_exec(offset=%x,buf=%x,len=%x)\n",(int)offset, (int)dst, (int)len);
146:
147: memset(&strm, 0, sizeof(strm));
148: strm.workspace = kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL);
149: if (strm.workspace == NULL) {
150: DBG_FLT("binfmt_flat: no memory for decompress workspace\n");
151: return -ENOMEM;
152: }
153: buf = kmalloc(LBUFSIZE, GFP_KERNEL);
154: if (buf == NULL) {
155: DBG_FLT("binfmt_flat: no memory for read buffer\n");
156: retval = -ENOMEM;
157: goto out_free;
158: }
159:
160: /* Read in first chunk of data and parse gzip header. */
161: fpos = offset;
162: ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos);
163:
164: strm.next_in = buf;
165: strm.avail_in = ret;
166: strm.total_in = 0;
167:
168: retval = -ENOEXEC;
169:
170: /* Check minimum size -- gzip header */
171: if (ret < 10) {
172: DBG_FLT("binfmt_flat: file too small?\n");
173: goto out_free_buf;
174: }
175:
176: /* Check gzip magic number */
177: if ((buf[0] != 037) || ((buf[1] != 0213) && (buf[1] != 0236))) {
178: DBG_FLT("binfmt_flat: unknown compression magic?\n");
179: goto out_free_buf;
180: }
181:
182: /* Check gzip method */
183: if (buf[2] != 8) {
184: DBG_FLT("binfmt_flat: unknown compression method?\n");
185: goto out_free_buf;
186: }
187: /* Check gzip flags */
188: if ((buf[3] & ENCRYPTED) || (buf[3] & CONTINUATION) ||
189: (buf[3] & RESERVED)) {
190: DBG_FLT("binfmt_flat: unknown flags?\n");
191: goto out_free_buf;
192: }
193:
194: ret = 10;
195: if (buf[3] & EXTRA_FIELD) {
196: ret += 2 + buf[10] + (buf[11] << 8);
197: if (unlikely(LBUFSIZE == ret)) {
198: DBG_FLT("binfmt_flat: buffer overflow (EXTRA)?\n");
199: goto out_free_buf;
200: }
201: }
202: if (buf[3] & ORIG_NAME) {
203: for (; ret < LBUFSIZE && (buf[ret] != 0); ret++)
204: ;
205: if (unlikely(LBUFSIZE == ret)) {
206: DBG_FLT("binfmt_flat: buffer overflow (ORIG_NAME)?\n");
207: goto out_free_buf;
208: }
209: }
210: if (buf[3] & COMMENT) {
211: for (; ret < LBUFSIZE && (buf[ret] != 0); ret++)
212: ;
213: if (unlikely(LBUFSIZE == ret)) {
214: DBG_FLT("binfmt_flat: buffer overflow (COMMENT)?\n");
215: goto out_free_buf;
216: }
217: }
218:
219: strm.next_in += ret;
220: strm.avail_in -= ret;
221:
222: strm.next_out = dst;
223: strm.avail_out = len;
224: strm.total_out = 0;
225:
226: if (zlib_inflateInit2(&strm, -MAX_WBITS) != Z_OK) {
227: DBG_FLT("binfmt_flat: zlib init failed?\n");
228: goto out_free_buf;
229: }
230:
231: while ((ret = zlib_inflate(&strm, Z_NO_FLUSH)) == Z_OK) {
232: ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos);
233: if (ret <= 0)
234: break;
235: if (ret >= (unsigned long) -4096)
236: break;
237: len -= ret;
238:
239: strm.next_in = buf;
240: strm.avail_in = ret;
241: strm.total_in = 0;
242: }
243:
244: if (ret < 0) {
245: DBG_FLT("binfmt_flat: decompression failed (%d), %s\n",
246: ret, strm.msg);
247: goto out_zlib;
248: }
249:
250: retval = 0;
251: out_zlib:
252: zlib_inflateEnd(&strm);
253: out_free_buf:
254: kfree(buf);
255: out_free:
256: kfree(strm.workspace);
257: out:
258: return retval;
259: }
260:
261: #endif /* CONFIG_BINFMT_ZFLAT */
262:
263: /****************************************************************************/
264:
265: static target_ulong
266: calc_reloc(target_ulong r, struct lib_info *p, int curid, int internalp)
267: {
268: target_ulong addr;
269: int id;
270: target_ulong start_brk;
271: target_ulong start_data;
272: target_ulong text_len;
273: target_ulong start_code;
274:
275: #ifdef CONFIG_BINFMT_SHARED_FLAT
276: #error needs checking
277: if (r == 0)
278: id = curid; /* Relocs of 0 are always self referring */
279: else {
280: id = (r >> 24) & 0xff; /* Find ID for this reloc */
281: r &= 0x00ffffff; /* Trim ID off here */
282: }
283: if (id >= MAX_SHARED_LIBS) {
284: fprintf(stderr, "BINFMT_FLAT: reference 0x%x to shared library %d\n",
285: (unsigned) r, id);
286: goto failed;
287: }
288: if (curid != id) {
289: if (internalp) {
290: fprintf(stderr, "BINFMT_FLAT: reloc address 0x%x not "
291: "in same module (%d != %d)\n",
292: (unsigned) r, curid, id);
293: goto failed;
294: } else if ( ! p[id].loaded &&
295: load_flat_shared_library(id, p) > (unsigned long) -4096) {
296: fprintf(stderr, "BINFMT_FLAT: failed to load library %d\n", id);
297: goto failed;
298: }
299: /* Check versioning information (i.e. time stamps) */
300: if (p[id].build_date && p[curid].build_date
301: && p[curid].build_date < p[id].build_date) {
302: fprintf(stderr, "BINFMT_FLAT: library %d is younger than %d\n",
303: id, curid);
304: goto failed;
305: }
306: }
307: #else
308: id = 0;
309: #endif
310:
311: start_brk = p[id].start_brk;
312: start_data = p[id].start_data;
313: start_code = p[id].start_code;
314: text_len = p[id].text_len;
315:
316: if (!flat_reloc_valid(r, start_brk - start_data + text_len)) {
317: fprintf(stderr, "BINFMT_FLAT: reloc outside program 0x%x "
318: "(0 - 0x%x/0x%x)\n",
319: (int) r,(int)(start_brk-start_code),(int)text_len);
320: goto failed;
321: }
322:
323: if (r < text_len) /* In text segment */
324: addr = r + start_code;
325: else /* In data segment */
326: addr = r - text_len + start_data;
327:
328: /* Range checked already above so doing the range tests is redundant...*/
329: return(addr);
330:
331: failed:
332: abort();
333: return RELOC_FAILED;
334: }
335:
336: /****************************************************************************/
337:
338: /* ??? This does not handle endianness correctly. */
339: void old_reloc(struct lib_info *libinfo, uint32_t rl)
340: {
341: #ifdef DEBUG
342: char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" };
343: #endif
344: uint32_t *ptr;
345: uint32_t offset;
346: int reloc_type;
347:
348: offset = rl & 0x3fffffff;
349: reloc_type = rl >> 30;
350: /* ??? How to handle this? */
351: #if defined(CONFIG_COLDFIRE)
352: ptr = (uint32_t *) (libinfo->start_code + offset);
353: #else
354: ptr = (uint32_t *) (libinfo->start_data + offset);
355: #endif
356:
357: #ifdef DEBUG
358: fprintf(stderr, "Relocation of variable at DATASEG+%x "
359: "(address %p, currently %x) into segment %s\n",
360: offset, ptr, (int)*ptr, segment[reloc_type]);
361: #endif
362:
363: switch (reloc_type) {
364: case OLD_FLAT_RELOC_TYPE_TEXT:
365: *ptr += libinfo->start_code;
366: break;
367: case OLD_FLAT_RELOC_TYPE_DATA:
368: *ptr += libinfo->start_data;
369: break;
370: case OLD_FLAT_RELOC_TYPE_BSS:
371: *ptr += libinfo->end_data;
372: break;
373: default:
374: fprintf(stderr, "BINFMT_FLAT: Unknown relocation type=%x\n",
375: reloc_type);
376: break;
377: }
378: DBG_FLT("Relocation became %x\n", (int)*ptr);
379: }
380:
381: /****************************************************************************/
382:
383: static int load_flat_file(struct linux_binprm * bprm,
384: struct lib_info *libinfo, int id, target_ulong *extra_stack)
385: {
386: struct flat_hdr * hdr;
387: target_ulong textpos = 0, datapos = 0, result;
388: target_ulong realdatastart = 0;
389: target_ulong text_len, data_len, bss_len, stack_len, flags;
390: target_ulong memp = 0; /* for finding the brk area */
391: target_ulong extra;
392: target_ulong reloc = 0, rp;
393: int i, rev, relocs = 0;
394: target_ulong fpos;
395: target_ulong start_code, end_code;
396:
397: hdr = ((struct flat_hdr *) bprm->buf); /* exec-header */
398:
399: text_len = ntohl(hdr->data_start);
400: data_len = ntohl(hdr->data_end) - ntohl(hdr->data_start);
401: bss_len = ntohl(hdr->bss_end) - ntohl(hdr->data_end);
402: stack_len = ntohl(hdr->stack_size);
403: if (extra_stack) {
404: stack_len += *extra_stack;
405: *extra_stack = stack_len;
406: }
407: relocs = ntohl(hdr->reloc_count);
408: flags = ntohl(hdr->flags);
409: rev = ntohl(hdr->rev);
410:
411: DBG_FLT("BINFMT_FLAT: Loading file: %s\n", bprm->filename);
412:
413: if (rev != FLAT_VERSION && rev != OLD_FLAT_VERSION) {
414: fprintf(stderr, "BINFMT_FLAT: bad magic/rev (0x%x, need 0x%x)\n",
415: rev, (int) FLAT_VERSION);
416: return -ENOEXEC;
417: }
418:
419: /* Don't allow old format executables to use shared libraries */
420: if (rev == OLD_FLAT_VERSION && id != 0) {
421: fprintf(stderr, "BINFMT_FLAT: shared libraries are not available\n");
422: return -ENOEXEC;
423: }
424:
425: /*
426: * fix up the flags for the older format, there were all kinds
427: * of endian hacks, this only works for the simple cases
428: */
429: if (rev == OLD_FLAT_VERSION && flat_old_ram_flag(flags))
430: flags = FLAT_FLAG_RAM;
431:
432: #ifndef CONFIG_BINFMT_ZFLAT
433: if (flags & (FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA)) {
434: fprintf(stderr, "Support for ZFLAT executables is not enabled\n");
435: return -ENOEXEC;
436: }
437: #endif
438:
439: /*
440: * calculate the extra space we need to map in
441: */
442: extra = relocs * sizeof(target_ulong);
443: if (extra < bss_len + stack_len)
444: extra = bss_len + stack_len;
445:
446: /*
447: * there are a couple of cases here, the separate code/data
448: * case, and then the fully copied to RAM case which lumps
449: * it all together.
450: */
451: if ((flags & (FLAT_FLAG_RAM|FLAT_FLAG_GZIP)) == 0) {
452: /*
453: * this should give us a ROM ptr, but if it doesn't we don't
454: * really care
455: */
456: DBG_FLT("BINFMT_FLAT: ROM mapping of file (we hope)\n");
457:
458: textpos = target_mmap(0, text_len, PROT_READ|PROT_EXEC,
459: MAP_PRIVATE, bprm->fd, 0);
460: if (textpos == -1) {
461: fprintf(stderr, "Unable to mmap process text\n");
462: return -1;
463: }
464:
465: realdatastart = target_mmap(0, data_len + extra +
466: MAX_SHARED_LIBS * sizeof(target_ulong),
467: PROT_READ|PROT_WRITE|PROT_EXEC,
468: MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
469:
470: if (realdatastart == -1) {
471: fprintf(stderr, "Unable to allocate RAM for process data\n");
472: return realdatastart;
473: }
474: datapos = realdatastart + MAX_SHARED_LIBS * sizeof(target_ulong);
475:
476: DBG_FLT("BINFMT_FLAT: Allocated data+bss+stack (%d bytes): %x\n",
477: (int)(data_len + bss_len + stack_len), (int)datapos);
478:
479: fpos = ntohl(hdr->data_start);
480: #ifdef CONFIG_BINFMT_ZFLAT
481: if (flags & FLAT_FLAG_GZDATA) {
482: result = decompress_exec(bprm, fpos, (char *) datapos,
483: data_len + (relocs * sizeof(target_ulong)))
484: } else
485: #endif
486: {
487: result = target_pread(bprm->fd, datapos,
488: data_len + (relocs * sizeof(target_ulong)),
489: fpos);
490: }
491: if (result < 0) {
492: fprintf(stderr, "Unable to read data+bss\n");
493: return result;
494: }
495:
496: reloc = datapos + (ntohl(hdr->reloc_start) - text_len);
497: memp = realdatastart;
498:
499: } else {
500:
501: textpos = target_mmap(0, text_len + data_len + extra +
502: MAX_SHARED_LIBS * sizeof(target_ulong),
503: PROT_READ | PROT_EXEC | PROT_WRITE,
504: MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
505: if (textpos == -1 ) {
506: fprintf(stderr, "Unable to allocate RAM for process text/data\n");
507: return -1;
508: }
509:
510: realdatastart = textpos + ntohl(hdr->data_start);
511: datapos = realdatastart + MAX_SHARED_LIBS * sizeof(target_ulong);
512: reloc = (textpos + ntohl(hdr->reloc_start) +
513: MAX_SHARED_LIBS * sizeof(target_ulong));
514: memp = textpos;
515:
516: #ifdef CONFIG_BINFMT_ZFLAT
517: #error code needs checking
518: /*
519: * load it all in and treat it like a RAM load from now on
520: */
521: if (flags & FLAT_FLAG_GZIP) {
522: result = decompress_exec(bprm, sizeof (struct flat_hdr),
523: (((char *) textpos) + sizeof (struct flat_hdr)),
524: (text_len + data_len + (relocs * sizeof(unsigned long))
525: - sizeof (struct flat_hdr)),
526: 0);
527: memmove((void *) datapos, (void *) realdatastart,
528: data_len + (relocs * sizeof(unsigned long)));
529: } else if (flags & FLAT_FLAG_GZDATA) {
530: fpos = 0;
531: result = bprm->file->f_op->read(bprm->file,
532: (char *) textpos, text_len, &fpos);
533: if (result < (unsigned long) -4096)
534: result = decompress_exec(bprm, text_len, (char *) datapos,
535: data_len + (relocs * sizeof(unsigned long)), 0);
536: }
537: else
538: #endif
539: {
540: result = target_pread(bprm->fd, textpos,
541: text_len, 0);
542: if (result >= 0) {
543: result = target_pread(bprm->fd, datapos,
544: data_len + (relocs * sizeof(target_ulong)),
545: ntohl(hdr->data_start));
546: }
547: }
548: if (result < 0) {
549: fprintf(stderr, "Unable to read code+data+bss\n");
550: return result;
551: }
552: }
553:
554: DBG_FLT("Mapping is 0x%x, Entry point is 0x%x, data_start is 0x%x\n",
555: (int)textpos, 0x00ffffff&ntohl(hdr->entry),
556: ntohl(hdr->data_start));
557:
558: /* The main program needs a little extra setup in the task structure */
559: start_code = textpos + sizeof (struct flat_hdr);
560: end_code = textpos + text_len;
561:
562: DBG_FLT("%s %s: TEXT=%x-%x DATA=%x-%x BSS=%x-%x\n",
563: id ? "Lib" : "Load", bprm->filename,
564: (int) start_code, (int) end_code,
565: (int) datapos,
566: (int) (datapos + data_len),
567: (int) (datapos + data_len),
568: (int) (((datapos + data_len + bss_len) + 3) & ~3));
569:
570: text_len -= sizeof(struct flat_hdr); /* the real code len */
571:
572: /* Store the current module values into the global library structure */
573: libinfo[id].start_code = start_code;
574: libinfo[id].start_data = datapos;
575: libinfo[id].end_data = datapos + data_len;
576: libinfo[id].start_brk = datapos + data_len + bss_len;
577: libinfo[id].text_len = text_len;
578: libinfo[id].loaded = 1;
579: libinfo[id].entry = (0x00ffffff & ntohl(hdr->entry)) + textpos;
580: libinfo[id].build_date = ntohl(hdr->build_date);
581:
582: /*
583: * We just load the allocations into some temporary memory to
584: * help simplify all this mumbo jumbo
585: *
586: * We've got two different sections of relocation entries.
587: * The first is the GOT which resides at the begining of the data segment
588: * and is terminated with a -1. This one can be relocated in place.
589: * The second is the extra relocation entries tacked after the image's
590: * data segment. These require a little more processing as the entry is
591: * really an offset into the image which contains an offset into the
592: * image.
593: */
594: if (flags & FLAT_FLAG_GOTPIC) {
595: rp = datapos;
596: while (1) {
597: target_ulong addr;
598: addr = tgetl(rp);
599: if (addr == -1)
600: break;
601: if (addr) {
602: addr = calc_reloc(addr, libinfo, id, 0);
603: if (addr == RELOC_FAILED)
604: return -ENOEXEC;
605: tputl(rp, addr);
606: }
607: rp += sizeof(target_ulong);
608: }
609: }
610:
611: /*
612: * Now run through the relocation entries.
613: * We've got to be careful here as C++ produces relocatable zero
614: * entries in the constructor and destructor tables which are then
615: * tested for being not zero (which will always occur unless we're
616: * based from address zero). This causes an endless loop as __start
617: * is at zero. The solution used is to not relocate zero addresses.
618: * This has the negative side effect of not allowing a global data
619: * reference to be statically initialised to _stext (I've moved
620: * __start to address 4 so that is okay).
621: */
622: if (rev > OLD_FLAT_VERSION) {
623: for (i = 0; i < relocs; i++) {
624: target_ulong addr, relval;
625:
626: /* Get the address of the pointer to be
627: relocated (of course, the address has to be
628: relocated first). */
629: relval = tgetl(reloc + i * sizeof (target_ulong));
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: addr = tgetl(rp);
637: if (addr != 0) {
638: /*
639: * Do the relocation. PIC relocs in the data section are
640: * already in target order
641: */
642:
643: #ifndef TARGET_WORDS_BIGENDIAN
644: if ((flags & FLAT_FLAG_GOTPIC) == 0)
645: addr = bswap32(addr);
646: #endif
647: addr = calc_reloc(addr, libinfo, id, 0);
648: if (addr == RELOC_FAILED)
649: return -ENOEXEC;
650:
651: /* Write back the relocated pointer. */
652: tputl(rp, addr);
653: }
654: }
655: } else {
656: for (i = 0; i < relocs; i++) {
657: target_ulong relval;
658: relval = tgetl(reloc + i * sizeof (target_ulong));
659: old_reloc(&libinfo[0], relval);
660: }
661: }
662:
663: /* zero the BSS. */
664: memset((void*)(datapos + data_len), 0, bss_len);
665:
666: return 0;
667: }
668:
669:
670: /****************************************************************************/
671: #ifdef CONFIG_BINFMT_SHARED_FLAT
672:
673: /*
674: * Load a shared library into memory. The library gets its own data
675: * segment (including bss) but not argv/argc/environ.
676: */
677:
678: static int load_flat_shared_library(int id, struct lib_info *libs)
679: {
680: struct linux_binprm bprm;
681: int res;
682: char buf[16];
683:
684: /* Create the file name */
685: sprintf(buf, "/lib/lib%d.so", id);
686:
687: /* Open the file up */
688: bprm.filename = buf;
689: bprm.file = open_exec(bprm.filename);
690: res = PTR_ERR(bprm.file);
691: if (IS_ERR(bprm.file))
692: return res;
693:
694: res = prepare_binprm(&bprm);
695:
696: if (res <= (unsigned long)-4096)
697: res = load_flat_file(&bprm, libs, id, NULL);
698: if (bprm.file) {
699: allow_write_access(bprm.file);
700: fput(bprm.file);
701: bprm.file = NULL;
702: }
703: return(res);
704: }
705:
706: #endif /* CONFIG_BINFMT_SHARED_FLAT */
707:
708: int load_flt_binary(struct linux_binprm * bprm, struct target_pt_regs * regs,
709: struct image_info * info)
710: {
711: struct lib_info libinfo[MAX_SHARED_LIBS];
712: target_ulong p = bprm->p;
713: target_ulong stack_len;
714: target_ulong start_addr;
715: target_ulong sp;
716: int res;
717: int i, j;
718:
719: memset(libinfo, 0, sizeof(libinfo));
720: /*
721: * We have to add the size of our arguments to our stack size
722: * otherwise it's too easy for users to create stack overflows
723: * by passing in a huge argument list. And yes, we have to be
724: * pedantic and include space for the argv/envp array as it may have
725: * a lot of entries.
726: */
727: #define TOP_OF_ARGS (TARGET_PAGE_SIZE * MAX_ARG_PAGES - sizeof(void *))
728: stack_len = TOP_OF_ARGS - bprm->p; /* the strings */
729: stack_len += (bprm->argc + 1) * 4; /* the argv array */
730: stack_len += (bprm->envc + 1) * 4; /* the envp array */
731:
732:
733: res = load_flat_file(bprm, libinfo, 0, &stack_len);
734: if (res > (unsigned long)-4096)
735: return res;
736:
737: /* Update data segment pointers for all libraries */
738: for (i=0; i<MAX_SHARED_LIBS; i++) {
739: if (libinfo[i].loaded) {
740: target_ulong p;
741: p = libinfo[i].start_data;
742: for (j=0; j<MAX_SHARED_LIBS; j++) {
743: p -= 4;
744: tput32(p, libinfo[j].loaded
745: ? libinfo[j].start_data
746: : UNLOADED_LIB);
747: }
748: }
749: }
750:
751: p = ((libinfo[0].start_brk + stack_len + 3) & ~3) - 4;
752: DBG_FLT("p=%x\n", (int)p);
753:
754: /* Copy argv/envp. */
755: p = copy_strings(p, bprm->envc, bprm->envp);
1.1.1.2 ! root 756: p = copy_strings(p, bprm->argc, bprm->argv);
1.1 root 757: /* Align stack. */
758: sp = p & ~(target_ulong)(sizeof(target_ulong) - 1);
759: sp = loader_build_argptr(bprm->envc, bprm->argc, sp, p, 1);
760:
761: /* Fake some return addresses to ensure the call chain will
762: * initialise library in order for us. We are required to call
763: * lib 1 first, then 2, ... and finally the main program (id 0).
764: */
765: start_addr = libinfo[0].entry;
766:
767: #ifdef CONFIG_BINFMT_SHARED_FLAT
768: #error here
769: for (i = MAX_SHARED_LIBS-1; i>0; i--) {
770: if (libinfo[i].loaded) {
771: /* Push previos first to call address */
772: --sp; put_user(start_addr, sp);
773: start_addr = libinfo[i].entry;
774: }
775: }
776: #endif
777:
778: /* Stash our initial stack pointer into the mm structure */
779: info->start_code = libinfo[0].start_code;
780: info->end_code = libinfo[0].start_code = libinfo[0].text_len;
781: info->start_data = libinfo[0].start_data;
782: info->end_data = libinfo[0].end_data;
783: info->start_brk = libinfo[0].start_brk;
784: info->start_stack = sp;
785: info->entry = start_addr;
786: info->code_offset = info->start_code;
787: info->data_offset = info->start_data - libinfo[0].text_len;
788:
789: DBG_FLT("start_thread(entry=0x%x, start_stack=0x%x)\n",
790: (int)info->entry, (int)info->start_stack);
791:
792: return 0;
793: }
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