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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
1.1.1.5 root 16: * along with this program; if not, see <http://www.gnu.org/licenses/>.
1.1 root 17: *
18: * Copyright (C) 2006 CodeSourcery.
19: * Copyright (C) 2000-2003 David McCullough <[email protected]>
20: * Copyright (C) 2002 Greg Ungerer <[email protected]>
21: * Copyright (C) 2002 SnapGear, by Paul Dale <[email protected]>
22: * Copyright (C) 2000, 2001 Lineo, by David McCullough <[email protected]>
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 <[email protected]>
29: * JAN/99 -- coded full program relocation ([email protected])
30: */
31:
32: /* ??? ZFLAT and shared library support is currently disabled. */
33:
34: /****************************************************************************/
35:
36: #include <stdio.h>
37: #include <stdlib.h>
38: #include <errno.h>
39: #include <sys/mman.h>
40: #include <unistd.h>
41:
42: #include "qemu.h"
43: #include "flat.h"
44:
45: //#define DEBUG
46:
47: #ifdef DEBUG
1.1.1.5 root 48: #define DBG_FLT(...) printf(__VA_ARGS__)
1.1 root 49: #else
1.1.1.5 root 50: #define DBG_FLT(...)
1.1 root 51: #endif
52:
53: #define flat_reloc_valid(reloc, size) ((reloc) <= (size))
54: #define flat_old_ram_flag(flag) (flag)
55: #ifdef TARGET_WORDS_BIGENDIAN
56: #define flat_get_relocate_addr(relval) (relval)
57: #else
58: #define flat_get_relocate_addr(relval) bswap32(relval)
59: #endif
60:
61: #define RELOC_FAILED 0xff00ff01 /* Relocation incorrect somewhere */
62: #define UNLOADED_LIB 0x7ff000ff /* Placeholder for unused library */
63:
64: struct lib_info {
1.1.1.3 root 65: abi_ulong start_code; /* Start of text segment */
66: abi_ulong start_data; /* Start of data segment */
67: abi_ulong end_data; /* Start of bss section */
68: abi_ulong start_brk; /* End of data segment */
69: abi_ulong text_len; /* Length of text segment */
70: abi_ulong entry; /* Start address for this module */
71: abi_ulong build_date; /* When this one was compiled */
1.1 root 72: short loaded; /* Has this library been loaded? */
73: };
74:
75: #ifdef CONFIG_BINFMT_SHARED_FLAT
76: static int load_flat_shared_library(int id, struct lib_info *p);
77: #endif
78:
79: struct linux_binprm;
80:
81: #define ntohl(x) be32_to_cpu(x)
82:
83: /****************************************************************************/
84: /*
85: * create_flat_tables() parses the env- and arg-strings in new user
86: * memory and creates the pointer tables from them, and puts their
87: * addresses on the "stack", returning the new stack pointer value.
88: */
89:
90: /* Push a block of strings onto the guest stack. */
1.1.1.3 root 91: static abi_ulong copy_strings(abi_ulong p, int n, char **s)
1.1 root 92: {
93: int len;
94:
95: while (n-- > 0) {
96: len = strlen(s[n]) + 1;
97: p -= len;
98: memcpy_to_target(p, s[n], len);
99: }
100:
101: return p;
102: }
103:
1.1.1.4 root 104: static int target_pread(int fd, abi_ulong ptr, abi_ulong len,
105: abi_ulong offset)
1.1 root 106: {
107: void *buf;
108: int ret;
109:
1.1.1.3 root 110: buf = lock_user(VERIFY_WRITE, ptr, len, 0);
1.1 root 111: ret = pread(fd, buf, len, offset);
112: unlock_user(buf, ptr, len);
113: return ret;
114: }
115: /****************************************************************************/
116:
117: #ifdef CONFIG_BINFMT_ZFLAT
118:
119: #include <linux/zlib.h>
120:
121: #define LBUFSIZE 4000
122:
123: /* gzip flag byte */
124: #define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */
125: #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
126: #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
127: #define ORIG_NAME 0x08 /* bit 3 set: original file name present */
128: #define COMMENT 0x10 /* bit 4 set: file comment present */
129: #define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
130: #define RESERVED 0xC0 /* bit 6,7: reserved */
131:
132: static int decompress_exec(
133: struct linux_binprm *bprm,
134: unsigned long offset,
135: char *dst,
136: long len,
137: int fd)
138: {
139: unsigned char *buf;
140: z_stream strm;
141: loff_t fpos;
142: int ret, retval;
143:
144: DBG_FLT("decompress_exec(offset=%x,buf=%x,len=%x)\n",(int)offset, (int)dst, (int)len);
145:
146: memset(&strm, 0, sizeof(strm));
147: strm.workspace = kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL);
148: if (strm.workspace == NULL) {
149: DBG_FLT("binfmt_flat: no memory for decompress workspace\n");
150: return -ENOMEM;
151: }
152: buf = kmalloc(LBUFSIZE, GFP_KERNEL);
153: if (buf == NULL) {
154: DBG_FLT("binfmt_flat: no memory for read buffer\n");
155: retval = -ENOMEM;
156: goto out_free;
157: }
158:
159: /* Read in first chunk of data and parse gzip header. */
160: fpos = offset;
161: ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos);
162:
163: strm.next_in = buf;
164: strm.avail_in = ret;
165: strm.total_in = 0;
166:
167: retval = -ENOEXEC;
168:
169: /* Check minimum size -- gzip header */
170: if (ret < 10) {
171: DBG_FLT("binfmt_flat: file too small?\n");
172: goto out_free_buf;
173: }
174:
175: /* Check gzip magic number */
176: if ((buf[0] != 037) || ((buf[1] != 0213) && (buf[1] != 0236))) {
177: DBG_FLT("binfmt_flat: unknown compression magic?\n");
178: goto out_free_buf;
179: }
180:
181: /* Check gzip method */
182: if (buf[2] != 8) {
183: DBG_FLT("binfmt_flat: unknown compression method?\n");
184: goto out_free_buf;
185: }
186: /* Check gzip flags */
187: if ((buf[3] & ENCRYPTED) || (buf[3] & CONTINUATION) ||
188: (buf[3] & RESERVED)) {
189: DBG_FLT("binfmt_flat: unknown flags?\n");
190: goto out_free_buf;
191: }
192:
193: ret = 10;
194: if (buf[3] & EXTRA_FIELD) {
195: ret += 2 + buf[10] + (buf[11] << 8);
196: if (unlikely(LBUFSIZE == ret)) {
197: DBG_FLT("binfmt_flat: buffer overflow (EXTRA)?\n");
198: goto out_free_buf;
199: }
200: }
201: if (buf[3] & ORIG_NAME) {
202: for (; ret < LBUFSIZE && (buf[ret] != 0); ret++)
203: ;
204: if (unlikely(LBUFSIZE == ret)) {
205: DBG_FLT("binfmt_flat: buffer overflow (ORIG_NAME)?\n");
206: goto out_free_buf;
207: }
208: }
209: if (buf[3] & COMMENT) {
210: for (; ret < LBUFSIZE && (buf[ret] != 0); ret++)
211: ;
212: if (unlikely(LBUFSIZE == ret)) {
213: DBG_FLT("binfmt_flat: buffer overflow (COMMENT)?\n");
214: goto out_free_buf;
215: }
216: }
217:
218: strm.next_in += ret;
219: strm.avail_in -= ret;
220:
221: strm.next_out = dst;
222: strm.avail_out = len;
223: strm.total_out = 0;
224:
225: if (zlib_inflateInit2(&strm, -MAX_WBITS) != Z_OK) {
226: DBG_FLT("binfmt_flat: zlib init failed?\n");
227: goto out_free_buf;
228: }
229:
230: while ((ret = zlib_inflate(&strm, Z_NO_FLUSH)) == Z_OK) {
231: ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos);
232: if (ret <= 0)
233: break;
234: if (ret >= (unsigned long) -4096)
235: break;
236: len -= ret;
237:
238: strm.next_in = buf;
239: strm.avail_in = ret;
240: strm.total_in = 0;
241: }
242:
243: if (ret < 0) {
244: DBG_FLT("binfmt_flat: decompression failed (%d), %s\n",
245: ret, strm.msg);
246: goto out_zlib;
247: }
248:
249: retval = 0;
250: out_zlib:
251: zlib_inflateEnd(&strm);
252: out_free_buf:
253: kfree(buf);
254: out_free:
255: kfree(strm.workspace);
256: out:
257: return retval;
258: }
259:
260: #endif /* CONFIG_BINFMT_ZFLAT */
261:
262: /****************************************************************************/
263:
1.1.1.3 root 264: static abi_ulong
265: calc_reloc(abi_ulong r, struct lib_info *p, int curid, int internalp)
1.1 root 266: {
1.1.1.3 root 267: abi_ulong addr;
1.1 root 268: int id;
1.1.1.3 root 269: abi_ulong start_brk;
270: abi_ulong start_data;
271: abi_ulong text_len;
272: abi_ulong start_code;
1.1 root 273:
274: #ifdef CONFIG_BINFMT_SHARED_FLAT
275: #error needs checking
276: if (r == 0)
277: id = curid; /* Relocs of 0 are always self referring */
278: else {
279: id = (r >> 24) & 0xff; /* Find ID for this reloc */
280: r &= 0x00ffffff; /* Trim ID off here */
281: }
282: if (id >= MAX_SHARED_LIBS) {
283: fprintf(stderr, "BINFMT_FLAT: reference 0x%x to shared library %d\n",
284: (unsigned) r, id);
285: goto failed;
286: }
287: if (curid != id) {
288: if (internalp) {
289: fprintf(stderr, "BINFMT_FLAT: reloc address 0x%x not "
290: "in same module (%d != %d)\n",
291: (unsigned) r, curid, id);
292: goto failed;
293: } else if ( ! p[id].loaded &&
294: load_flat_shared_library(id, p) > (unsigned long) -4096) {
295: fprintf(stderr, "BINFMT_FLAT: failed to load library %d\n", id);
296: goto failed;
297: }
298: /* Check versioning information (i.e. time stamps) */
299: if (p[id].build_date && p[curid].build_date
300: && p[curid].build_date < p[id].build_date) {
301: fprintf(stderr, "BINFMT_FLAT: library %d is younger than %d\n",
302: id, curid);
303: goto failed;
304: }
305: }
306: #else
307: id = 0;
308: #endif
309:
310: start_brk = p[id].start_brk;
311: start_data = p[id].start_data;
312: start_code = p[id].start_code;
313: text_len = p[id].text_len;
314:
315: if (!flat_reloc_valid(r, start_brk - start_data + text_len)) {
316: fprintf(stderr, "BINFMT_FLAT: reloc outside program 0x%x "
317: "(0 - 0x%x/0x%x)\n",
318: (int) r,(int)(start_brk-start_code),(int)text_len);
319: goto failed;
320: }
321:
322: if (r < text_len) /* In text segment */
323: addr = r + start_code;
324: else /* In data segment */
325: addr = r - text_len + start_data;
326:
327: /* Range checked already above so doing the range tests is redundant...*/
328: return(addr);
329:
330: failed:
331: abort();
332: return RELOC_FAILED;
333: }
334:
335: /****************************************************************************/
336:
337: /* ??? This does not handle endianness correctly. */
1.1.1.4 root 338: static void old_reloc(struct lib_info *libinfo, uint32_t rl)
1.1 root 339: {
340: #ifdef DEBUG
1.1.1.6 root 341: const char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" };
1.1 root 342: #endif
343: uint32_t *ptr;
344: uint32_t offset;
345: int reloc_type;
346:
347: offset = rl & 0x3fffffff;
348: reloc_type = rl >> 30;
349: /* ??? How to handle this? */
350: #if defined(CONFIG_COLDFIRE)
1.1.1.4 root 351: ptr = (uint32_t *) ((unsigned long) libinfo->start_code + offset);
1.1 root 352: #else
1.1.1.4 root 353: ptr = (uint32_t *) ((unsigned long) libinfo->start_data + offset);
1.1 root 354: #endif
355:
356: #ifdef DEBUG
357: fprintf(stderr, "Relocation of variable at DATASEG+%x "
358: "(address %p, currently %x) into segment %s\n",
359: offset, ptr, (int)*ptr, segment[reloc_type]);
360: #endif
1.1.1.3 root 361:
1.1 root 362: switch (reloc_type) {
363: case OLD_FLAT_RELOC_TYPE_TEXT:
364: *ptr += libinfo->start_code;
365: break;
366: case OLD_FLAT_RELOC_TYPE_DATA:
367: *ptr += libinfo->start_data;
368: break;
369: case OLD_FLAT_RELOC_TYPE_BSS:
370: *ptr += libinfo->end_data;
371: break;
372: default:
373: fprintf(stderr, "BINFMT_FLAT: Unknown relocation type=%x\n",
374: reloc_type);
375: break;
376: }
377: DBG_FLT("Relocation became %x\n", (int)*ptr);
1.1.1.3 root 378: }
1.1 root 379:
380: /****************************************************************************/
381:
382: static int load_flat_file(struct linux_binprm * bprm,
1.1.1.3 root 383: struct lib_info *libinfo, int id, abi_ulong *extra_stack)
1.1 root 384: {
385: struct flat_hdr * hdr;
1.1.1.7 ! root 386: abi_ulong textpos = 0, datapos = 0;
! 387: abi_long result;
1.1.1.3 root 388: abi_ulong realdatastart = 0;
389: abi_ulong text_len, data_len, bss_len, stack_len, flags;
390: abi_ulong memp = 0; /* for finding the brk area */
391: abi_ulong extra;
392: abi_ulong reloc = 0, rp;
1.1 root 393: int i, rev, relocs = 0;
1.1.1.3 root 394: abi_ulong fpos;
395: abi_ulong start_code, end_code;
396: abi_ulong indx_len;
1.1 root 397:
398: hdr = ((struct flat_hdr *) bprm->buf); /* exec-header */
399:
400: text_len = ntohl(hdr->data_start);
401: data_len = ntohl(hdr->data_end) - ntohl(hdr->data_start);
402: bss_len = ntohl(hdr->bss_end) - ntohl(hdr->data_end);
403: stack_len = ntohl(hdr->stack_size);
404: if (extra_stack) {
405: stack_len += *extra_stack;
406: *extra_stack = stack_len;
407: }
408: relocs = ntohl(hdr->reloc_count);
409: flags = ntohl(hdr->flags);
410: rev = ntohl(hdr->rev);
411:
412: DBG_FLT("BINFMT_FLAT: Loading file: %s\n", bprm->filename);
413:
414: if (rev != FLAT_VERSION && rev != OLD_FLAT_VERSION) {
415: fprintf(stderr, "BINFMT_FLAT: bad magic/rev (0x%x, need 0x%x)\n",
416: rev, (int) FLAT_VERSION);
417: return -ENOEXEC;
418: }
1.1.1.3 root 419:
1.1 root 420: /* Don't allow old format executables to use shared libraries */
421: if (rev == OLD_FLAT_VERSION && id != 0) {
422: fprintf(stderr, "BINFMT_FLAT: shared libraries are not available\n");
423: return -ENOEXEC;
424: }
425:
426: /*
427: * fix up the flags for the older format, there were all kinds
428: * of endian hacks, this only works for the simple cases
429: */
430: if (rev == OLD_FLAT_VERSION && flat_old_ram_flag(flags))
431: flags = FLAT_FLAG_RAM;
432:
433: #ifndef CONFIG_BINFMT_ZFLAT
434: if (flags & (FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA)) {
435: fprintf(stderr, "Support for ZFLAT executables is not enabled\n");
436: return -ENOEXEC;
437: }
438: #endif
439:
440: /*
441: * calculate the extra space we need to map in
442: */
1.1.1.3 root 443: extra = relocs * sizeof(abi_ulong);
1.1 root 444: if (extra < bss_len + stack_len)
445: extra = bss_len + stack_len;
446:
1.1.1.3 root 447: /* Add space for library base pointers. Make sure this does not
448: misalign the doesn't misalign the data segment. */
449: indx_len = MAX_SHARED_LIBS * sizeof(abi_ulong);
450: indx_len = (indx_len + 15) & ~(abi_ulong)15;
451:
1.1 root 452: /*
453: * there are a couple of cases here, the separate code/data
454: * case, and then the fully copied to RAM case which lumps
455: * it all together.
456: */
457: if ((flags & (FLAT_FLAG_RAM|FLAT_FLAG_GZIP)) == 0) {
458: /*
459: * this should give us a ROM ptr, but if it doesn't we don't
460: * really care
461: */
462: DBG_FLT("BINFMT_FLAT: ROM mapping of file (we hope)\n");
463:
464: textpos = target_mmap(0, text_len, PROT_READ|PROT_EXEC,
465: MAP_PRIVATE, bprm->fd, 0);
1.1.1.3 root 466: if (textpos == -1) {
1.1 root 467: fprintf(stderr, "Unable to mmap process text\n");
468: return -1;
469: }
470:
1.1.1.3 root 471: realdatastart = target_mmap(0, data_len + extra + indx_len,
1.1 root 472: PROT_READ|PROT_WRITE|PROT_EXEC,
473: MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
474:
475: if (realdatastart == -1) {
476: fprintf(stderr, "Unable to allocate RAM for process data\n");
477: return realdatastart;
478: }
1.1.1.3 root 479: datapos = realdatastart + indx_len;
1.1 root 480:
481: DBG_FLT("BINFMT_FLAT: Allocated data+bss+stack (%d bytes): %x\n",
482: (int)(data_len + bss_len + stack_len), (int)datapos);
483:
484: fpos = ntohl(hdr->data_start);
485: #ifdef CONFIG_BINFMT_ZFLAT
486: if (flags & FLAT_FLAG_GZDATA) {
1.1.1.3 root 487: result = decompress_exec(bprm, fpos, (char *) datapos,
488: data_len + (relocs * sizeof(abi_ulong)))
1.1 root 489: } else
490: #endif
491: {
492: result = target_pread(bprm->fd, datapos,
1.1.1.3 root 493: data_len + (relocs * sizeof(abi_ulong)),
1.1 root 494: fpos);
495: }
496: if (result < 0) {
497: fprintf(stderr, "Unable to read data+bss\n");
498: return result;
499: }
500:
501: reloc = datapos + (ntohl(hdr->reloc_start) - text_len);
502: memp = realdatastart;
503:
504: } else {
505:
1.1.1.3 root 506: textpos = target_mmap(0, text_len + data_len + extra + indx_len,
1.1 root 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);
1.1.1.3 root 515: datapos = realdatastart + indx_len;
516: reloc = (textpos + ntohl(hdr->reloc_start) + indx_len);
1.1 root 517: memp = textpos;
518:
519: #ifdef CONFIG_BINFMT_ZFLAT
520: #error code needs checking
521: /*
522: * load it all in and treat it like a RAM load from now on
523: */
524: if (flags & FLAT_FLAG_GZIP) {
525: result = decompress_exec(bprm, sizeof (struct flat_hdr),
526: (((char *) textpos) + sizeof (struct flat_hdr)),
527: (text_len + data_len + (relocs * sizeof(unsigned long))
528: - sizeof (struct flat_hdr)),
529: 0);
530: memmove((void *) datapos, (void *) realdatastart,
531: data_len + (relocs * sizeof(unsigned long)));
532: } else if (flags & FLAT_FLAG_GZDATA) {
533: fpos = 0;
534: result = bprm->file->f_op->read(bprm->file,
535: (char *) textpos, text_len, &fpos);
536: if (result < (unsigned long) -4096)
537: result = decompress_exec(bprm, text_len, (char *) datapos,
538: data_len + (relocs * sizeof(unsigned long)), 0);
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,
1.1.1.3 root 547: data_len + (relocs * sizeof(abi_ulong)),
1.1 root 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: end_code = textpos + text_len;
564:
565: DBG_FLT("%s %s: TEXT=%x-%x DATA=%x-%x BSS=%x-%x\n",
566: id ? "Lib" : "Load", bprm->filename,
567: (int) start_code, (int) end_code,
568: (int) datapos,
569: (int) (datapos + data_len),
570: (int) (datapos + data_len),
571: (int) (((datapos + data_len + bss_len) + 3) & ~3));
572:
573: text_len -= sizeof(struct flat_hdr); /* the real code len */
574:
575: /* Store the current module values into the global library structure */
576: libinfo[id].start_code = start_code;
577: libinfo[id].start_data = datapos;
578: libinfo[id].end_data = datapos + data_len;
579: libinfo[id].start_brk = datapos + data_len + bss_len;
580: libinfo[id].text_len = text_len;
581: libinfo[id].loaded = 1;
582: libinfo[id].entry = (0x00ffffff & ntohl(hdr->entry)) + textpos;
583: libinfo[id].build_date = ntohl(hdr->build_date);
1.1.1.3 root 584:
1.1 root 585: /*
586: * We just load the allocations into some temporary memory to
587: * help simplify all this mumbo jumbo
588: *
589: * We've got two different sections of relocation entries.
590: * The first is the GOT which resides at the begining of the data segment
591: * and is terminated with a -1. This one can be relocated in place.
592: * The second is the extra relocation entries tacked after the image's
593: * data segment. These require a little more processing as the entry is
594: * really an offset into the image which contains an offset into the
595: * image.
596: */
597: if (flags & FLAT_FLAG_GOTPIC) {
598: rp = datapos;
599: while (1) {
1.1.1.3 root 600: abi_ulong addr;
601: if (get_user_ual(addr, rp))
602: return -EFAULT;
1.1 root 603: if (addr == -1)
604: break;
605: if (addr) {
606: addr = calc_reloc(addr, libinfo, id, 0);
607: if (addr == RELOC_FAILED)
608: return -ENOEXEC;
1.1.1.3 root 609: if (put_user_ual(addr, rp))
610: return -EFAULT;
1.1 root 611: }
1.1.1.3 root 612: rp += sizeof(abi_ulong);
1.1 root 613: }
614: }
615:
616: /*
617: * Now run through the relocation entries.
618: * We've got to be careful here as C++ produces relocatable zero
619: * entries in the constructor and destructor tables which are then
620: * tested for being not zero (which will always occur unless we're
621: * based from address zero). This causes an endless loop as __start
622: * is at zero. The solution used is to not relocate zero addresses.
623: * This has the negative side effect of not allowing a global data
624: * reference to be statically initialised to _stext (I've moved
625: * __start to address 4 so that is okay).
626: */
627: if (rev > OLD_FLAT_VERSION) {
628: for (i = 0; i < relocs; i++) {
1.1.1.3 root 629: abi_ulong addr, relval;
1.1 root 630:
631: /* Get the address of the pointer to be
632: relocated (of course, the address has to be
633: relocated first). */
1.1.1.3 root 634: if (get_user_ual(relval, reloc + i * sizeof(abi_ulong)))
635: return -EFAULT;
1.1 root 636: addr = flat_get_relocate_addr(relval);
637: rp = calc_reloc(addr, libinfo, id, 1);
638: if (rp == RELOC_FAILED)
639: return -ENOEXEC;
640:
641: /* Get the pointer's value. */
1.1.1.3 root 642: if (get_user_ual(addr, rp))
643: return -EFAULT;
1.1 root 644: if (addr != 0) {
645: /*
646: * Do the relocation. PIC relocs in the data section are
647: * already in target order
648: */
649:
650: #ifndef TARGET_WORDS_BIGENDIAN
651: if ((flags & FLAT_FLAG_GOTPIC) == 0)
652: addr = bswap32(addr);
653: #endif
654: addr = calc_reloc(addr, libinfo, id, 0);
655: if (addr == RELOC_FAILED)
656: return -ENOEXEC;
657:
658: /* Write back the relocated pointer. */
1.1.1.3 root 659: if (put_user_ual(addr, rp))
660: return -EFAULT;
1.1 root 661: }
662: }
663: } else {
664: for (i = 0; i < relocs; i++) {
1.1.1.3 root 665: abi_ulong relval;
666: if (get_user_ual(relval, reloc + i * sizeof(abi_ulong)))
667: return -EFAULT;
1.1 root 668: old_reloc(&libinfo[0], relval);
669: }
670: }
1.1.1.3 root 671:
1.1 root 672: /* zero the BSS. */
1.1.1.4 root 673: memset((void *)((unsigned long)datapos + data_len), 0, bss_len);
1.1 root 674:
675: return 0;
676: }
677:
678:
679: /****************************************************************************/
680: #ifdef CONFIG_BINFMT_SHARED_FLAT
681:
682: /*
683: * Load a shared library into memory. The library gets its own data
684: * segment (including bss) but not argv/argc/environ.
685: */
686:
687: static int load_flat_shared_library(int id, struct lib_info *libs)
688: {
689: struct linux_binprm bprm;
690: int res;
691: char buf[16];
692:
693: /* Create the file name */
694: sprintf(buf, "/lib/lib%d.so", id);
695:
696: /* Open the file up */
697: bprm.filename = buf;
698: bprm.file = open_exec(bprm.filename);
699: res = PTR_ERR(bprm.file);
700: if (IS_ERR(bprm.file))
701: return res;
702:
703: res = prepare_binprm(&bprm);
704:
705: if (res <= (unsigned long)-4096)
706: res = load_flat_file(&bprm, libs, id, NULL);
707: if (bprm.file) {
708: allow_write_access(bprm.file);
709: fput(bprm.file);
710: bprm.file = NULL;
711: }
712: return(res);
713: }
714:
715: #endif /* CONFIG_BINFMT_SHARED_FLAT */
716:
717: int load_flt_binary(struct linux_binprm * bprm, struct target_pt_regs * regs,
718: struct image_info * info)
719: {
720: struct lib_info libinfo[MAX_SHARED_LIBS];
1.1.1.3 root 721: abi_ulong p = bprm->p;
722: abi_ulong stack_len;
723: abi_ulong start_addr;
724: abi_ulong sp;
1.1 root 725: int res;
726: int i, j;
727:
728: memset(libinfo, 0, sizeof(libinfo));
729: /*
730: * We have to add the size of our arguments to our stack size
731: * otherwise it's too easy for users to create stack overflows
732: * by passing in a huge argument list. And yes, we have to be
733: * pedantic and include space for the argv/envp array as it may have
734: * a lot of entries.
735: */
736: #define TOP_OF_ARGS (TARGET_PAGE_SIZE * MAX_ARG_PAGES - sizeof(void *))
737: stack_len = TOP_OF_ARGS - bprm->p; /* the strings */
738: stack_len += (bprm->argc + 1) * 4; /* the argv array */
739: stack_len += (bprm->envc + 1) * 4; /* the envp array */
740:
1.1.1.3 root 741:
1.1 root 742: res = load_flat_file(bprm, libinfo, 0, &stack_len);
743: if (res > (unsigned long)-4096)
744: return res;
1.1.1.3 root 745:
1.1 root 746: /* Update data segment pointers for all libraries */
747: for (i=0; i<MAX_SHARED_LIBS; i++) {
748: if (libinfo[i].loaded) {
1.1.1.3 root 749: abi_ulong p;
1.1 root 750: p = libinfo[i].start_data;
751: for (j=0; j<MAX_SHARED_LIBS; j++) {
752: p -= 4;
1.1.1.3 root 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;
1.1 root 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);
1.1.1.2 root 768: p = copy_strings(p, bprm->argc, bprm->argv);
1.1 root 769: /* Align stack. */
1.1.1.3 root 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 += 3; /* argc, arvg, argp */
775: stack_len *= sizeof(abi_ulong);
776: if ((sp + stack_len) & 15)
777: sp -= 16 - ((sp + stack_len) & 15);
1.1 root 778: sp = loader_build_argptr(bprm->envc, bprm->argc, sp, p, 1);
1.1.1.3 root 779:
1.1 root 780: /* Fake some return addresses to ensure the call chain will
781: * initialise library in order for us. We are required to call
782: * lib 1 first, then 2, ... and finally the main program (id 0).
783: */
784: start_addr = libinfo[0].entry;
785:
786: #ifdef CONFIG_BINFMT_SHARED_FLAT
787: #error here
788: for (i = MAX_SHARED_LIBS-1; i>0; i--) {
789: if (libinfo[i].loaded) {
790: /* Push previos first to call address */
1.1.1.3 root 791: --sp;
792: if (put_user_ual(start_addr, sp))
793: return -EFAULT;
1.1 root 794: start_addr = libinfo[i].entry;
795: }
796: }
797: #endif
1.1.1.3 root 798:
1.1 root 799: /* Stash our initial stack pointer into the mm structure */
800: info->start_code = libinfo[0].start_code;
801: info->end_code = libinfo[0].start_code = libinfo[0].text_len;
802: info->start_data = libinfo[0].start_data;
803: info->end_data = libinfo[0].end_data;
804: info->start_brk = libinfo[0].start_brk;
805: info->start_stack = sp;
1.1.1.6 root 806: info->stack_limit = libinfo[0].start_brk;
1.1 root 807: info->entry = start_addr;
808: info->code_offset = info->start_code;
809: info->data_offset = info->start_data - libinfo[0].text_len;
810:
811: DBG_FLT("start_thread(entry=0x%x, start_stack=0x%x)\n",
812: (int)info->entry, (int)info->start_stack);
1.1.1.3 root 813:
1.1 root 814: return 0;
815: }
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