![[BACK]](/cvsweb/icons/back.gif){kind=icon}
Return to flatload.c CVS log ![[TXT]](/cvsweb/icons/text.gif){kind=icon}
![[DIR]](/cvsweb/icons/dir.gif){kind=icon}
Up to [Qemu by Fabrice Bellard] / qemu / linux-user|
Return to flatload.c CVS log | Up to [Qemu by Fabrice Bellard] / qemu / linux-user |
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"
1.1.1.8 root 44: #define ntohl(x) be32_to_cpu(x)
45: #include <target_flat.h>
1.1 root 46:
47: //#define DEBUG
48:
49: #ifdef DEBUG
1.1.1.5 root 50: #define DBG_FLT(...) printf(__VA_ARGS__)
1.1 root 51: #else
1.1.1.5 root 52: #define DBG_FLT(...)
1.1 root 53: #endif
54:
55: #define RELOC_FAILED 0xff00ff01 /* Relocation incorrect somewhere */
56: #define UNLOADED_LIB 0x7ff000ff /* Placeholder for unused library */
57:
58: struct lib_info {
1.1.1.3 root 59: abi_ulong start_code; /* Start of text segment */
60: abi_ulong start_data; /* Start of data segment */
61: abi_ulong end_data; /* Start of bss section */
62: abi_ulong start_brk; /* End of data segment */
63: abi_ulong text_len; /* Length of text segment */
64: abi_ulong entry; /* Start address for this module */
65: abi_ulong build_date; /* When this one was compiled */
1.1 root 66: short loaded; /* Has this library been loaded? */
67: };
68:
69: #ifdef CONFIG_BINFMT_SHARED_FLAT
70: static int load_flat_shared_library(int id, struct lib_info *p);
71: #endif
72:
73: struct linux_binprm;
74:
75: /****************************************************************************/
76: /*
77: * create_flat_tables() parses the env- and arg-strings in new user
78: * memory and creates the pointer tables from them, and puts their
79: * addresses on the "stack", returning the new stack pointer value.
80: */
81:
82: /* Push a block of strings onto the guest stack. */
1.1.1.3 root 83: static abi_ulong copy_strings(abi_ulong p, int n, char **s)
1.1 root 84: {
85: int len;
86:
87: while (n-- > 0) {
88: len = strlen(s[n]) + 1;
89: p -= len;
90: memcpy_to_target(p, s[n], len);
91: }
92:
93: return p;
94: }
95:
1.1.1.4 root 96: static int target_pread(int fd, abi_ulong ptr, abi_ulong len,
97: abi_ulong offset)
1.1 root 98: {
99: void *buf;
100: int ret;
101:
1.1.1.3 root 102: buf = lock_user(VERIFY_WRITE, ptr, len, 0);
1.1 root 103: ret = pread(fd, buf, len, offset);
104: unlock_user(buf, ptr, len);
105: return ret;
106: }
107: /****************************************************************************/
108:
109: #ifdef CONFIG_BINFMT_ZFLAT
110:
111: #include <linux/zlib.h>
112:
113: #define LBUFSIZE 4000
114:
115: /* gzip flag byte */
116: #define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */
117: #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
118: #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
119: #define ORIG_NAME 0x08 /* bit 3 set: original file name present */
120: #define COMMENT 0x10 /* bit 4 set: file comment present */
121: #define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
122: #define RESERVED 0xC0 /* bit 6,7: reserved */
123:
124: static int decompress_exec(
125: struct linux_binprm *bprm,
126: unsigned long offset,
127: char *dst,
128: long len,
129: int fd)
130: {
131: unsigned char *buf;
132: z_stream strm;
133: loff_t fpos;
134: int ret, retval;
135:
136: DBG_FLT("decompress_exec(offset=%x,buf=%x,len=%x)\n",(int)offset, (int)dst, (int)len);
137:
138: memset(&strm, 0, sizeof(strm));
139: strm.workspace = kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL);
140: if (strm.workspace == NULL) {
141: DBG_FLT("binfmt_flat: no memory for decompress workspace\n");
142: return -ENOMEM;
143: }
144: buf = kmalloc(LBUFSIZE, GFP_KERNEL);
145: if (buf == NULL) {
146: DBG_FLT("binfmt_flat: no memory for read buffer\n");
147: retval = -ENOMEM;
148: goto out_free;
149: }
150:
151: /* Read in first chunk of data and parse gzip header. */
152: fpos = offset;
153: ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos);
154:
155: strm.next_in = buf;
156: strm.avail_in = ret;
157: strm.total_in = 0;
158:
159: retval = -ENOEXEC;
160:
161: /* Check minimum size -- gzip header */
162: if (ret < 10) {
163: DBG_FLT("binfmt_flat: file too small?\n");
164: goto out_free_buf;
165: }
166:
167: /* Check gzip magic number */
168: if ((buf[0] != 037) || ((buf[1] != 0213) && (buf[1] != 0236))) {
169: DBG_FLT("binfmt_flat: unknown compression magic?\n");
170: goto out_free_buf;
171: }
172:
173: /* Check gzip method */
174: if (buf[2] != 8) {
175: DBG_FLT("binfmt_flat: unknown compression method?\n");
176: goto out_free_buf;
177: }
178: /* Check gzip flags */
179: if ((buf[3] & ENCRYPTED) || (buf[3] & CONTINUATION) ||
180: (buf[3] & RESERVED)) {
181: DBG_FLT("binfmt_flat: unknown flags?\n");
182: goto out_free_buf;
183: }
184:
185: ret = 10;
186: if (buf[3] & EXTRA_FIELD) {
187: ret += 2 + buf[10] + (buf[11] << 8);
188: if (unlikely(LBUFSIZE == ret)) {
189: DBG_FLT("binfmt_flat: buffer overflow (EXTRA)?\n");
190: goto out_free_buf;
191: }
192: }
193: if (buf[3] & ORIG_NAME) {
194: for (; ret < LBUFSIZE && (buf[ret] != 0); ret++)
195: ;
196: if (unlikely(LBUFSIZE == ret)) {
197: DBG_FLT("binfmt_flat: buffer overflow (ORIG_NAME)?\n");
198: goto out_free_buf;
199: }
200: }
201: if (buf[3] & COMMENT) {
202: for (; ret < LBUFSIZE && (buf[ret] != 0); ret++)
203: ;
204: if (unlikely(LBUFSIZE == ret)) {
205: DBG_FLT("binfmt_flat: buffer overflow (COMMENT)?\n");
206: goto out_free_buf;
207: }
208: }
209:
210: strm.next_in += ret;
211: strm.avail_in -= ret;
212:
213: strm.next_out = dst;
214: strm.avail_out = len;
215: strm.total_out = 0;
216:
217: if (zlib_inflateInit2(&strm, -MAX_WBITS) != Z_OK) {
218: DBG_FLT("binfmt_flat: zlib init failed?\n");
219: goto out_free_buf;
220: }
221:
222: while ((ret = zlib_inflate(&strm, Z_NO_FLUSH)) == Z_OK) {
223: ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos);
224: if (ret <= 0)
225: break;
226: if (ret >= (unsigned long) -4096)
227: break;
228: len -= ret;
229:
230: strm.next_in = buf;
231: strm.avail_in = ret;
232: strm.total_in = 0;
233: }
234:
235: if (ret < 0) {
236: DBG_FLT("binfmt_flat: decompression failed (%d), %s\n",
237: ret, strm.msg);
238: goto out_zlib;
239: }
240:
241: retval = 0;
242: out_zlib:
243: zlib_inflateEnd(&strm);
244: out_free_buf:
245: kfree(buf);
246: out_free:
247: kfree(strm.workspace);
248: out:
249: return retval;
250: }
251:
252: #endif /* CONFIG_BINFMT_ZFLAT */
253:
254: /****************************************************************************/
255:
1.1.1.3 root 256: static abi_ulong
257: calc_reloc(abi_ulong r, struct lib_info *p, int curid, int internalp)
1.1 root 258: {
1.1.1.3 root 259: abi_ulong addr;
1.1 root 260: int id;
1.1.1.3 root 261: abi_ulong start_brk;
262: abi_ulong start_data;
263: abi_ulong text_len;
264: abi_ulong start_code;
1.1 root 265:
266: #ifdef CONFIG_BINFMT_SHARED_FLAT
267: #error needs checking
268: if (r == 0)
269: id = curid; /* Relocs of 0 are always self referring */
270: else {
271: id = (r >> 24) & 0xff; /* Find ID for this reloc */
272: r &= 0x00ffffff; /* Trim ID off here */
273: }
274: if (id >= MAX_SHARED_LIBS) {
275: fprintf(stderr, "BINFMT_FLAT: reference 0x%x to shared library %d\n",
276: (unsigned) r, id);
277: goto failed;
278: }
279: if (curid != id) {
280: if (internalp) {
281: fprintf(stderr, "BINFMT_FLAT: reloc address 0x%x not "
282: "in same module (%d != %d)\n",
283: (unsigned) r, curid, id);
284: goto failed;
285: } else if ( ! p[id].loaded &&
286: load_flat_shared_library(id, p) > (unsigned long) -4096) {
287: fprintf(stderr, "BINFMT_FLAT: failed to load library %d\n", id);
288: goto failed;
289: }
290: /* Check versioning information (i.e. time stamps) */
291: if (p[id].build_date && p[curid].build_date
292: && p[curid].build_date < p[id].build_date) {
293: fprintf(stderr, "BINFMT_FLAT: library %d is younger than %d\n",
294: id, curid);
295: goto failed;
296: }
297: }
298: #else
299: id = 0;
300: #endif
301:
302: start_brk = p[id].start_brk;
303: start_data = p[id].start_data;
304: start_code = p[id].start_code;
305: text_len = p[id].text_len;
306:
307: if (!flat_reloc_valid(r, start_brk - start_data + text_len)) {
308: fprintf(stderr, "BINFMT_FLAT: reloc outside program 0x%x "
309: "(0 - 0x%x/0x%x)\n",
310: (int) r,(int)(start_brk-start_code),(int)text_len);
311: goto failed;
312: }
313:
314: if (r < text_len) /* In text segment */
315: addr = r + start_code;
316: else /* In data segment */
317: addr = r - text_len + start_data;
318:
319: /* Range checked already above so doing the range tests is redundant...*/
320: return(addr);
321:
322: failed:
323: abort();
324: return RELOC_FAILED;
325: }
326:
327: /****************************************************************************/
328:
329: /* ??? This does not handle endianness correctly. */
1.1.1.4 root 330: static void old_reloc(struct lib_info *libinfo, uint32_t rl)
1.1 root 331: {
332: #ifdef DEBUG
1.1.1.6 root 333: const char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" };
1.1 root 334: #endif
335: uint32_t *ptr;
336: uint32_t offset;
337: int reloc_type;
338:
339: offset = rl & 0x3fffffff;
340: reloc_type = rl >> 30;
341: /* ??? How to handle this? */
342: #if defined(CONFIG_COLDFIRE)
1.1.1.4 root 343: ptr = (uint32_t *) ((unsigned long) libinfo->start_code + offset);
1.1 root 344: #else
1.1.1.4 root 345: ptr = (uint32_t *) ((unsigned long) libinfo->start_data + offset);
1.1 root 346: #endif
347:
348: #ifdef DEBUG
349: fprintf(stderr, "Relocation of variable at DATASEG+%x "
350: "(address %p, currently %x) into segment %s\n",
351: offset, ptr, (int)*ptr, segment[reloc_type]);
352: #endif
1.1.1.3 root 353:
1.1 root 354: switch (reloc_type) {
355: case OLD_FLAT_RELOC_TYPE_TEXT:
356: *ptr += libinfo->start_code;
357: break;
358: case OLD_FLAT_RELOC_TYPE_DATA:
359: *ptr += libinfo->start_data;
360: break;
361: case OLD_FLAT_RELOC_TYPE_BSS:
362: *ptr += libinfo->end_data;
363: break;
364: default:
365: fprintf(stderr, "BINFMT_FLAT: Unknown relocation type=%x\n",
366: reloc_type);
367: break;
368: }
369: DBG_FLT("Relocation became %x\n", (int)*ptr);
1.1.1.3 root 370: }
1.1 root 371:
372: /****************************************************************************/
373:
374: static int load_flat_file(struct linux_binprm * bprm,
1.1.1.3 root 375: struct lib_info *libinfo, int id, abi_ulong *extra_stack)
1.1 root 376: {
377: struct flat_hdr * hdr;
1.1.1.7 root 378: abi_ulong textpos = 0, datapos = 0;
379: abi_long result;
1.1.1.3 root 380: abi_ulong realdatastart = 0;
381: abi_ulong text_len, data_len, bss_len, stack_len, flags;
382: abi_ulong extra;
383: abi_ulong reloc = 0, rp;
1.1 root 384: int i, rev, relocs = 0;
1.1.1.3 root 385: abi_ulong fpos;
1.1.1.8 root 386: abi_ulong start_code;
1.1.1.3 root 387: abi_ulong indx_len;
1.1 root 388:
389: hdr = ((struct flat_hdr *) bprm->buf); /* exec-header */
390:
391: text_len = ntohl(hdr->data_start);
392: data_len = ntohl(hdr->data_end) - ntohl(hdr->data_start);
393: bss_len = ntohl(hdr->bss_end) - ntohl(hdr->data_end);
394: stack_len = ntohl(hdr->stack_size);
395: if (extra_stack) {
396: stack_len += *extra_stack;
397: *extra_stack = stack_len;
398: }
399: relocs = ntohl(hdr->reloc_count);
400: flags = ntohl(hdr->flags);
401: rev = ntohl(hdr->rev);
402:
403: DBG_FLT("BINFMT_FLAT: Loading file: %s\n", bprm->filename);
404:
405: if (rev != FLAT_VERSION && rev != OLD_FLAT_VERSION) {
406: fprintf(stderr, "BINFMT_FLAT: bad magic/rev (0x%x, need 0x%x)\n",
407: rev, (int) FLAT_VERSION);
408: return -ENOEXEC;
409: }
1.1.1.3 root 410:
1.1 root 411: /* Don't allow old format executables to use shared libraries */
412: if (rev == OLD_FLAT_VERSION && id != 0) {
413: fprintf(stderr, "BINFMT_FLAT: shared libraries are not available\n");
414: return -ENOEXEC;
415: }
416:
417: /*
418: * fix up the flags for the older format, there were all kinds
419: * of endian hacks, this only works for the simple cases
420: */
421: if (rev == OLD_FLAT_VERSION && flat_old_ram_flag(flags))
422: flags = FLAT_FLAG_RAM;
423:
424: #ifndef CONFIG_BINFMT_ZFLAT
425: if (flags & (FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA)) {
426: fprintf(stderr, "Support for ZFLAT executables is not enabled\n");
427: return -ENOEXEC;
428: }
429: #endif
430:
431: /*
432: * calculate the extra space we need to map in
433: */
1.1.1.3 root 434: extra = relocs * sizeof(abi_ulong);
1.1 root 435: if (extra < bss_len + stack_len)
436: extra = bss_len + stack_len;
437:
1.1.1.3 root 438: /* Add space for library base pointers. Make sure this does not
439: misalign the doesn't misalign the data segment. */
440: indx_len = MAX_SHARED_LIBS * sizeof(abi_ulong);
441: indx_len = (indx_len + 15) & ~(abi_ulong)15;
442:
1.1 root 443: /*
444: * there are a couple of cases here, the separate code/data
445: * case, and then the fully copied to RAM case which lumps
446: * it all together.
447: */
448: if ((flags & (FLAT_FLAG_RAM|FLAT_FLAG_GZIP)) == 0) {
449: /*
450: * this should give us a ROM ptr, but if it doesn't we don't
451: * really care
452: */
453: DBG_FLT("BINFMT_FLAT: ROM mapping of file (we hope)\n");
454:
455: textpos = target_mmap(0, text_len, PROT_READ|PROT_EXEC,
456: MAP_PRIVATE, bprm->fd, 0);
1.1.1.3 root 457: if (textpos == -1) {
1.1 root 458: fprintf(stderr, "Unable to mmap process text\n");
459: return -1;
460: }
461:
1.1.1.3 root 462: realdatastart = target_mmap(0, data_len + extra + indx_len,
1.1 root 463: PROT_READ|PROT_WRITE|PROT_EXEC,
464: MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
465:
466: if (realdatastart == -1) {
467: fprintf(stderr, "Unable to allocate RAM for process data\n");
468: return realdatastart;
469: }
1.1.1.3 root 470: datapos = realdatastart + indx_len;
1.1 root 471:
472: DBG_FLT("BINFMT_FLAT: Allocated data+bss+stack (%d bytes): %x\n",
473: (int)(data_len + bss_len + stack_len), (int)datapos);
474:
475: fpos = ntohl(hdr->data_start);
476: #ifdef CONFIG_BINFMT_ZFLAT
477: if (flags & FLAT_FLAG_GZDATA) {
1.1.1.3 root 478: result = decompress_exec(bprm, fpos, (char *) datapos,
479: data_len + (relocs * sizeof(abi_ulong)))
1.1 root 480: } else
481: #endif
482: {
483: result = target_pread(bprm->fd, datapos,
1.1.1.3 root 484: data_len + (relocs * sizeof(abi_ulong)),
1.1 root 485: fpos);
486: }
487: if (result < 0) {
488: fprintf(stderr, "Unable to read data+bss\n");
489: return result;
490: }
491:
492: reloc = datapos + (ntohl(hdr->reloc_start) - text_len);
493:
494: } else {
495:
1.1.1.3 root 496: textpos = target_mmap(0, text_len + data_len + extra + indx_len,
1.1 root 497: PROT_READ | PROT_EXEC | PROT_WRITE,
498: MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
499: if (textpos == -1 ) {
500: fprintf(stderr, "Unable to allocate RAM for process text/data\n");
501: return -1;
502: }
503:
504: realdatastart = textpos + ntohl(hdr->data_start);
1.1.1.3 root 505: datapos = realdatastart + indx_len;
506: reloc = (textpos + ntohl(hdr->reloc_start) + indx_len);
1.1 root 507:
508: #ifdef CONFIG_BINFMT_ZFLAT
509: #error code needs checking
510: /*
511: * load it all in and treat it like a RAM load from now on
512: */
513: if (flags & FLAT_FLAG_GZIP) {
514: result = decompress_exec(bprm, sizeof (struct flat_hdr),
515: (((char *) textpos) + sizeof (struct flat_hdr)),
516: (text_len + data_len + (relocs * sizeof(unsigned long))
517: - sizeof (struct flat_hdr)),
518: 0);
519: memmove((void *) datapos, (void *) realdatastart,
520: data_len + (relocs * sizeof(unsigned long)));
521: } else if (flags & FLAT_FLAG_GZDATA) {
522: fpos = 0;
523: result = bprm->file->f_op->read(bprm->file,
524: (char *) textpos, text_len, &fpos);
525: if (result < (unsigned long) -4096)
526: result = decompress_exec(bprm, text_len, (char *) datapos,
527: data_len + (relocs * sizeof(unsigned long)), 0);
528: }
529: else
530: #endif
531: {
532: result = target_pread(bprm->fd, textpos,
533: text_len, 0);
534: if (result >= 0) {
535: result = target_pread(bprm->fd, datapos,
1.1.1.3 root 536: data_len + (relocs * sizeof(abi_ulong)),
1.1 root 537: ntohl(hdr->data_start));
538: }
539: }
540: if (result < 0) {
541: fprintf(stderr, "Unable to read code+data+bss\n");
542: return result;
543: }
544: }
545:
546: DBG_FLT("Mapping is 0x%x, Entry point is 0x%x, data_start is 0x%x\n",
547: (int)textpos, 0x00ffffff&ntohl(hdr->entry),
548: ntohl(hdr->data_start));
549:
550: /* The main program needs a little extra setup in the task structure */
551: start_code = textpos + sizeof (struct flat_hdr);
552:
553: DBG_FLT("%s %s: TEXT=%x-%x DATA=%x-%x BSS=%x-%x\n",
554: id ? "Lib" : "Load", bprm->filename,
1.1.1.8 root 555: (int) start_code, (int) (textpos + text_len),
1.1 root 556: (int) datapos,
557: (int) (datapos + data_len),
558: (int) (datapos + data_len),
559: (int) (((datapos + data_len + bss_len) + 3) & ~3));
560:
561: text_len -= sizeof(struct flat_hdr); /* the real code len */
562:
563: /* Store the current module values into the global library structure */
564: libinfo[id].start_code = start_code;
565: libinfo[id].start_data = datapos;
566: libinfo[id].end_data = datapos + data_len;
567: libinfo[id].start_brk = datapos + data_len + bss_len;
568: libinfo[id].text_len = text_len;
569: libinfo[id].loaded = 1;
570: libinfo[id].entry = (0x00ffffff & ntohl(hdr->entry)) + textpos;
571: libinfo[id].build_date = ntohl(hdr->build_date);
1.1.1.3 root 572:
1.1 root 573: /*
574: * We just load the allocations into some temporary memory to
575: * help simplify all this mumbo jumbo
576: *
577: * We've got two different sections of relocation entries.
1.1.1.9 ! root 578: * The first is the GOT which resides at the beginning of the data segment
1.1 root 579: * and is terminated with a -1. This one can be relocated in place.
580: * The second is the extra relocation entries tacked after the image's
581: * data segment. These require a little more processing as the entry is
582: * really an offset into the image which contains an offset into the
583: * image.
584: */
585: if (flags & FLAT_FLAG_GOTPIC) {
586: rp = datapos;
587: while (1) {
1.1.1.3 root 588: abi_ulong addr;
589: if (get_user_ual(addr, rp))
590: return -EFAULT;
1.1 root 591: if (addr == -1)
592: break;
593: if (addr) {
594: addr = calc_reloc(addr, libinfo, id, 0);
595: if (addr == RELOC_FAILED)
596: return -ENOEXEC;
1.1.1.3 root 597: if (put_user_ual(addr, rp))
598: return -EFAULT;
1.1 root 599: }
1.1.1.3 root 600: rp += sizeof(abi_ulong);
1.1 root 601: }
602: }
603:
604: /*
605: * Now run through the relocation entries.
606: * We've got to be careful here as C++ produces relocatable zero
607: * entries in the constructor and destructor tables which are then
608: * tested for being not zero (which will always occur unless we're
609: * based from address zero). This causes an endless loop as __start
610: * is at zero. The solution used is to not relocate zero addresses.
611: * This has the negative side effect of not allowing a global data
612: * reference to be statically initialised to _stext (I've moved
613: * __start to address 4 so that is okay).
614: */
615: if (rev > OLD_FLAT_VERSION) {
1.1.1.8 root 616: abi_ulong persistent = 0;
1.1 root 617: for (i = 0; i < relocs; i++) {
1.1.1.3 root 618: abi_ulong addr, relval;
1.1 root 619:
620: /* Get the address of the pointer to be
621: relocated (of course, the address has to be
622: relocated first). */
1.1.1.3 root 623: if (get_user_ual(relval, reloc + i * sizeof(abi_ulong)))
624: return -EFAULT;
1.1.1.8 root 625: relval = ntohl(relval);
626: if (flat_set_persistent(relval, &persistent))
627: continue;
1.1 root 628: addr = flat_get_relocate_addr(relval);
629: rp = calc_reloc(addr, libinfo, id, 1);
630: if (rp == RELOC_FAILED)
631: return -ENOEXEC;
632:
633: /* Get the pointer's value. */
1.1.1.3 root 634: if (get_user_ual(addr, rp))
635: return -EFAULT;
1.1.1.8 root 636: addr = flat_get_addr_from_rp(rp, relval, flags, &persistent);
1.1 root 637: if (addr != 0) {
638: /*
639: * Do the relocation. PIC relocs in the data section are
640: * already in target order
641: */
642: if ((flags & FLAT_FLAG_GOTPIC) == 0)
1.1.1.8 root 643: addr = ntohl(addr);
1.1 root 644: addr = calc_reloc(addr, libinfo, id, 0);
645: if (addr == RELOC_FAILED)
646: return -ENOEXEC;
647:
648: /* Write back the relocated pointer. */
1.1.1.8 root 649: if (flat_put_addr_at_rp(rp, addr, relval))
1.1.1.3 root 650: return -EFAULT;
1.1 root 651: }
652: }
653: } else {
654: for (i = 0; i < relocs; i++) {
1.1.1.3 root 655: abi_ulong relval;
656: if (get_user_ual(relval, reloc + i * sizeof(abi_ulong)))
657: return -EFAULT;
1.1 root 658: old_reloc(&libinfo[0], relval);
659: }
660: }
1.1.1.3 root 661:
1.1 root 662: /* zero the BSS. */
1.1.1.4 root 663: memset((void *)((unsigned long)datapos + data_len), 0, bss_len);
1.1 root 664:
665: return 0;
666: }
667:
668:
669: /****************************************************************************/
670: #ifdef CONFIG_BINFMT_SHARED_FLAT
671:
672: /*
673: * Load a shared library into memory. The library gets its own data
674: * segment (including bss) but not argv/argc/environ.
675: */
676:
677: static int load_flat_shared_library(int id, struct lib_info *libs)
678: {
679: struct linux_binprm bprm;
680: int res;
681: char buf[16];
682:
683: /* Create the file name */
684: sprintf(buf, "/lib/lib%d.so", id);
685:
686: /* Open the file up */
687: bprm.filename = buf;
688: bprm.file = open_exec(bprm.filename);
689: res = PTR_ERR(bprm.file);
690: if (IS_ERR(bprm.file))
691: return res;
692:
693: res = prepare_binprm(&bprm);
694:
695: if (res <= (unsigned long)-4096)
696: res = load_flat_file(&bprm, libs, id, NULL);
697: if (bprm.file) {
698: allow_write_access(bprm.file);
699: fput(bprm.file);
700: bprm.file = NULL;
701: }
702: return(res);
703: }
704:
705: #endif /* CONFIG_BINFMT_SHARED_FLAT */
706:
707: int load_flt_binary(struct linux_binprm * bprm, struct target_pt_regs * regs,
708: struct image_info * info)
709: {
710: struct lib_info libinfo[MAX_SHARED_LIBS];
1.1.1.3 root 711: abi_ulong p = bprm->p;
712: abi_ulong stack_len;
713: abi_ulong start_addr;
714: abi_ulong sp;
1.1 root 715: int res;
716: int i, j;
717:
718: memset(libinfo, 0, sizeof(libinfo));
719: /*
720: * We have to add the size of our arguments to our stack size
721: * otherwise it's too easy for users to create stack overflows
722: * by passing in a huge argument list. And yes, we have to be
723: * pedantic and include space for the argv/envp array as it may have
724: * a lot of entries.
725: */
1.1.1.8 root 726: stack_len = 0;
727: for (i = 0; i < bprm->argc; ++i) {
728: /* the argv strings */
729: stack_len += strlen(bprm->argv[i]);
730: }
731: for (i = 0; i < bprm->envc; ++i) {
732: /* the envp strings */
733: stack_len += strlen(bprm->envp[i]);
734: }
1.1 root 735: stack_len += (bprm->argc + 1) * 4; /* the argv array */
736: stack_len += (bprm->envc + 1) * 4; /* the envp array */
737:
1.1.1.3 root 738:
1.1 root 739: res = load_flat_file(bprm, libinfo, 0, &stack_len);
740: if (res > (unsigned long)-4096)
741: return res;
1.1.1.3 root 742:
1.1 root 743: /* Update data segment pointers for all libraries */
744: for (i=0; i<MAX_SHARED_LIBS; i++) {
745: if (libinfo[i].loaded) {
1.1.1.3 root 746: abi_ulong p;
1.1 root 747: p = libinfo[i].start_data;
748: for (j=0; j<MAX_SHARED_LIBS; j++) {
749: p -= 4;
1.1.1.3 root 750: /* FIXME - handle put_user() failures */
751: if (put_user_ual(libinfo[j].loaded
752: ? libinfo[j].start_data
753: : UNLOADED_LIB,
754: p))
755: return -EFAULT;
1.1 root 756: }
757: }
758: }
759:
760: p = ((libinfo[0].start_brk + stack_len + 3) & ~3) - 4;
761: DBG_FLT("p=%x\n", (int)p);
762:
763: /* Copy argv/envp. */
764: p = copy_strings(p, bprm->envc, bprm->envp);
1.1.1.2 root 765: p = copy_strings(p, bprm->argc, bprm->argv);
1.1 root 766: /* Align stack. */
1.1.1.3 root 767: sp = p & ~(abi_ulong)(sizeof(abi_ulong) - 1);
768: /* Enforce final stack alignment of 16 bytes. This is sufficient
769: for all current targets, and excess alignment is harmless. */
770: stack_len = bprm->envc + bprm->argc + 2;
771: stack_len += 3; /* argc, arvg, argp */
772: stack_len *= sizeof(abi_ulong);
773: if ((sp + stack_len) & 15)
774: sp -= 16 - ((sp + stack_len) & 15);
1.1.1.8 root 775: sp = loader_build_argptr(bprm->envc, bprm->argc, sp, p,
776: flat_argvp_envp_on_stack());
1.1.1.3 root 777:
1.1 root 778: /* Fake some return addresses to ensure the call chain will
779: * initialise library in order for us. We are required to call
780: * lib 1 first, then 2, ... and finally the main program (id 0).
781: */
782: start_addr = libinfo[0].entry;
783:
784: #ifdef CONFIG_BINFMT_SHARED_FLAT
785: #error here
786: for (i = MAX_SHARED_LIBS-1; i>0; i--) {
787: if (libinfo[i].loaded) {
788: /* Push previos first to call address */
1.1.1.3 root 789: --sp;
790: if (put_user_ual(start_addr, sp))
791: return -EFAULT;
1.1 root 792: start_addr = libinfo[i].entry;
793: }
794: }
795: #endif
1.1.1.3 root 796:
1.1 root 797: /* Stash our initial stack pointer into the mm structure */
798: info->start_code = libinfo[0].start_code;
799: info->end_code = libinfo[0].start_code = libinfo[0].text_len;
800: info->start_data = libinfo[0].start_data;
801: info->end_data = libinfo[0].end_data;
802: info->start_brk = libinfo[0].start_brk;
803: info->start_stack = sp;
1.1.1.6 root 804: info->stack_limit = libinfo[0].start_brk;
1.1 root 805: info->entry = start_addr;
806: info->code_offset = info->start_code;
807: info->data_offset = info->start_data - libinfo[0].text_len;
808:
809: DBG_FLT("start_thread(entry=0x%x, start_stack=0x%x)\n",
810: (int)info->entry, (int)info->start_stack);
1.1.1.3 root 811:
1.1 root 812: return 0;
813: }
This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.