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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
1.1.1.4 ! root 17: * Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
! 18: * MA 02110-1301, USA.
1.1 root 19: *
20: * Copyright (C) 2006 CodeSourcery.
21: * Copyright (C) 2000-2003 David McCullough <[email protected]>
22: * Copyright (C) 2002 Greg Ungerer <[email protected]>
23: * Copyright (C) 2002 SnapGear, by Paul Dale <[email protected]>
24: * Copyright (C) 2000, 2001 Lineo, by David McCullough <[email protected]>
25: * based heavily on:
26: *
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 <[email protected]>
31: * JAN/99 -- coded full program relocation ([email protected])
32: */
33:
34: /* ??? ZFLAT and shared library support is currently disabled. */
35:
36: /****************************************************************************/
37:
38: #include <stdio.h>
39: #include <stdlib.h>
40: #include <errno.h>
41: #include <sys/mman.h>
42: #include <unistd.h>
43:
44: #include "qemu.h"
45: #include "flat.h"
46:
47: //#define DEBUG
48:
49: #ifdef DEBUG
50: #define DBG_FLT(a...) printf(a)
51: #else
52: #define DBG_FLT(a...)
53: #endif
54:
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
62:
63: #define RELOC_FAILED 0xff00ff01 /* Relocation incorrect somewhere */
64: #define UNLOADED_LIB 0x7ff000ff /* Placeholder for unused library */
65:
66: struct lib_info {
1.1.1.3 root 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 */
1.1 root 74: short loaded; /* Has this library been loaded? */
75: };
76:
77: #ifdef CONFIG_BINFMT_SHARED_FLAT
78: static int load_flat_shared_library(int id, struct lib_info *p);
79: #endif
80:
81: struct linux_binprm;
82:
83: #define ntohl(x) be32_to_cpu(x)
84:
85: /****************************************************************************/
86: /*
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.
90: */
91:
92: /* Push a block of strings onto the guest stack. */
1.1.1.3 root 93: static abi_ulong copy_strings(abi_ulong p, int n, char **s)
1.1 root 94: {
95: int len;
96:
97: while (n-- > 0) {
98: len = strlen(s[n]) + 1;
99: p -= len;
100: memcpy_to_target(p, s[n], len);
101: }
102:
103: return p;
104: }
105:
1.1.1.4 ! root 106: static int target_pread(int fd, abi_ulong ptr, abi_ulong len,
! 107: abi_ulong offset)
1.1 root 108: {
109: void *buf;
110: int ret;
111:
1.1.1.3 root 112: buf = lock_user(VERIFY_WRITE, ptr, len, 0);
1.1 root 113: ret = pread(fd, buf, len, offset);
114: unlock_user(buf, ptr, len);
115: return ret;
116: }
117: /****************************************************************************/
118:
119: #ifdef CONFIG_BINFMT_ZFLAT
120:
121: #include <linux/zlib.h>
122:
123: #define LBUFSIZE 4000
124:
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 */
133:
134: static int decompress_exec(
135: struct linux_binprm *bprm,
136: unsigned long offset,
137: char *dst,
138: long len,
139: int fd)
140: {
141: unsigned char *buf;
142: z_stream strm;
143: loff_t fpos;
144: int ret, retval;
145:
146: DBG_FLT("decompress_exec(offset=%x,buf=%x,len=%x)\n",(int)offset, (int)dst, (int)len);
147:
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;
153: }
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;
159: }
160:
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);
164:
165: strm.next_in = buf;
166: strm.avail_in = ret;
167: strm.total_in = 0;
168:
169: retval = -ENOEXEC;
170:
171: /* Check minimum size -- gzip header */
172: if (ret < 10) {
173: DBG_FLT("binfmt_flat: file too small?\n");
174: goto out_free_buf;
175: }
176:
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;
181: }
182:
183: /* Check gzip method */
184: if (buf[2] != 8) {
185: DBG_FLT("binfmt_flat: unknown compression method?\n");
186: goto out_free_buf;
187: }
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;
193: }
194:
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;
201: }
202: }
203: if (buf[3] & ORIG_NAME) {
204: for (; ret < LBUFSIZE && (buf[ret] != 0); ret++)
205: ;
206: if (unlikely(LBUFSIZE == ret)) {
207: DBG_FLT("binfmt_flat: buffer overflow (ORIG_NAME)?\n");
208: goto out_free_buf;
209: }
210: }
211: if (buf[3] & COMMENT) {
212: for (; ret < LBUFSIZE && (buf[ret] != 0); ret++)
213: ;
214: if (unlikely(LBUFSIZE == ret)) {
215: DBG_FLT("binfmt_flat: buffer overflow (COMMENT)?\n");
216: goto out_free_buf;
217: }
218: }
219:
220: strm.next_in += ret;
221: strm.avail_in -= ret;
222:
223: strm.next_out = dst;
224: strm.avail_out = len;
225: strm.total_out = 0;
226:
227: if (zlib_inflateInit2(&strm, -MAX_WBITS) != Z_OK) {
228: DBG_FLT("binfmt_flat: zlib init failed?\n");
229: goto out_free_buf;
230: }
231:
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;
239:
240: strm.next_in = buf;
241: strm.avail_in = ret;
242: strm.total_in = 0;
243: }
244:
245: if (ret < 0) {
246: DBG_FLT("binfmt_flat: decompression failed (%d), %s\n",
247: ret, strm.msg);
248: goto out_zlib;
249: }
250:
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;
260: }
261:
262: #endif /* CONFIG_BINFMT_ZFLAT */
263:
264: /****************************************************************************/
265:
1.1.1.3 root 266: static abi_ulong
267: calc_reloc(abi_ulong r, struct lib_info *p, int curid, int internalp)
1.1 root 268: {
1.1.1.3 root 269: abi_ulong addr;
1.1 root 270: int id;
1.1.1.3 root 271: abi_ulong start_brk;
272: abi_ulong start_data;
273: abi_ulong text_len;
274: abi_ulong start_code;
1.1 root 275:
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 */
283: }
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;
288: }
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;
299: }
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;
306: }
307: }
308: #else
309: id = 0;
310: #endif
311:
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;
316:
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;
322: }
323:
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;
328:
329: /* Range checked already above so doing the range tests is redundant...*/
330: return(addr);
331:
332: failed:
333: abort();
334: return RELOC_FAILED;
335: }
336:
337: /****************************************************************************/
338:
339: /* ??? This does not handle endianness correctly. */
1.1.1.4 ! root 340: static void old_reloc(struct lib_info *libinfo, uint32_t rl)
1.1 root 341: {
342: #ifdef DEBUG
343: char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" };
344: #endif
345: uint32_t *ptr;
346: uint32_t offset;
347: int reloc_type;
348:
349: offset = rl & 0x3fffffff;
350: reloc_type = rl >> 30;
351: /* ??? How to handle this? */
352: #if defined(CONFIG_COLDFIRE)
1.1.1.4 ! root 353: ptr = (uint32_t *) ((unsigned long) libinfo->start_code + offset);
1.1 root 354: #else
1.1.1.4 ! root 355: ptr = (uint32_t *) ((unsigned long) libinfo->start_data + offset);
1.1 root 356: #endif
357:
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
1.1.1.3 root 363:
1.1 root 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;
378: }
379: DBG_FLT("Relocation became %x\n", (int)*ptr);
1.1.1.3 root 380: }
1.1 root 381:
382: /****************************************************************************/
383:
384: static int load_flat_file(struct linux_binprm * bprm,
1.1.1.3 root 385: struct lib_info *libinfo, int id, abi_ulong *extra_stack)
1.1 root 386: {
387: struct flat_hdr * hdr;
1.1.1.3 root 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;
1.1 root 394: int i, rev, relocs = 0;
1.1.1.3 root 395: abi_ulong fpos;
396: abi_ulong start_code, end_code;
397: abi_ulong indx_len;
1.1 root 398:
399: hdr = ((struct flat_hdr *) bprm->buf); /* exec-header */
400:
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;
408: }
409: relocs = ntohl(hdr->reloc_count);
410: flags = ntohl(hdr->flags);
411: rev = ntohl(hdr->rev);
412:
413: DBG_FLT("BINFMT_FLAT: Loading file: %s\n", bprm->filename);
414:
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;
419: }
1.1.1.3 root 420:
1.1 root 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;
425: }
426:
427: /*
428: * fix up the flags for the older format, there were all kinds
429: * of endian hacks, this only works for the simple cases
430: */
431: if (rev == OLD_FLAT_VERSION && flat_old_ram_flag(flags))
432: flags = FLAT_FLAG_RAM;
433:
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;
438: }
439: #endif
440:
441: /*
442: * calculate the extra space we need to map in
443: */
1.1.1.3 root 444: extra = relocs * sizeof(abi_ulong);
1.1 root 445: if (extra < bss_len + stack_len)
446: extra = bss_len + stack_len;
447:
1.1.1.3 root 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;
452:
1.1 root 453: /*
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.
457: */
458: if ((flags & (FLAT_FLAG_RAM|FLAT_FLAG_GZIP)) == 0) {
459: /*
460: * this should give us a ROM ptr, but if it doesn't we don't
461: * really care
462: */
463: DBG_FLT("BINFMT_FLAT: ROM mapping of file (we hope)\n");
464:
465: textpos = target_mmap(0, text_len, PROT_READ|PROT_EXEC,
466: MAP_PRIVATE, bprm->fd, 0);
1.1.1.3 root 467: if (textpos == -1) {
1.1 root 468: fprintf(stderr, "Unable to mmap process text\n");
469: return -1;
470: }
471:
1.1.1.3 root 472: realdatastart = target_mmap(0, data_len + extra + indx_len,
1.1 root 473: PROT_READ|PROT_WRITE|PROT_EXEC,
474: MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
475:
476: if (realdatastart == -1) {
477: fprintf(stderr, "Unable to allocate RAM for process data\n");
478: return realdatastart;
479: }
1.1.1.3 root 480: datapos = realdatastart + indx_len;
1.1 root 481:
482: DBG_FLT("BINFMT_FLAT: Allocated data+bss+stack (%d bytes): %x\n",
483: (int)(data_len + bss_len + stack_len), (int)datapos);
484:
485: fpos = ntohl(hdr->data_start);
486: #ifdef CONFIG_BINFMT_ZFLAT
487: if (flags & FLAT_FLAG_GZDATA) {
1.1.1.3 root 488: result = decompress_exec(bprm, fpos, (char *) datapos,
489: data_len + (relocs * sizeof(abi_ulong)))
1.1 root 490: } else
491: #endif
492: {
493: result = target_pread(bprm->fd, datapos,
1.1.1.3 root 494: data_len + (relocs * sizeof(abi_ulong)),
1.1 root 495: fpos);
496: }
497: if (result < 0) {
498: fprintf(stderr, "Unable to read data+bss\n");
499: return result;
500: }
501:
502: reloc = datapos + (ntohl(hdr->reloc_start) - text_len);
503: memp = realdatastart;
504:
505: } else {
506:
1.1.1.3 root 507: textpos = target_mmap(0, text_len + data_len + extra + indx_len,
1.1 root 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;
513: }
514:
515: realdatastart = textpos + ntohl(hdr->data_start);
1.1.1.3 root 516: datapos = realdatastart + indx_len;
517: reloc = (textpos + ntohl(hdr->reloc_start) + indx_len);
1.1 root 518: memp = textpos;
519:
520: #ifdef CONFIG_BINFMT_ZFLAT
521: #error code needs checking
522: /*
523: * load it all in and treat it like a RAM load from now on
524: */
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)),
530: 0);
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);
540: }
541: else
542: #endif
543: {
544: result = target_pread(bprm->fd, textpos,
545: text_len, 0);
546: if (result >= 0) {
547: result = target_pread(bprm->fd, datapos,
1.1.1.3 root 548: data_len + (relocs * sizeof(abi_ulong)),
1.1 root 549: ntohl(hdr->data_start));
550: }
551: }
552: if (result < 0) {
553: fprintf(stderr, "Unable to read code+data+bss\n");
554: return result;
555: }
556: }
557:
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));
561:
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;
565:
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));
573:
574: text_len -= sizeof(struct flat_hdr); /* the real code len */
575:
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);
1.1.1.3 root 585:
1.1 root 586: /*
587: * We just load the allocations into some temporary memory to
588: * help simplify all this mumbo jumbo
589: *
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.
597: */
598: if (flags & FLAT_FLAG_GOTPIC) {
599: rp = datapos;
600: while (1) {
1.1.1.3 root 601: abi_ulong addr;
602: if (get_user_ual(addr, rp))
603: return -EFAULT;
1.1 root 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;
1.1.1.3 root 610: if (put_user_ual(addr, rp))
611: return -EFAULT;
1.1 root 612: }
1.1.1.3 root 613: rp += sizeof(abi_ulong);
1.1 root 614: }
615: }
616:
617: /*
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).
627: */
628: if (rev > OLD_FLAT_VERSION) {
629: for (i = 0; i < relocs; i++) {
1.1.1.3 root 630: abi_ulong addr, relval;
1.1 root 631:
632: /* Get the address of the pointer to be
633: relocated (of course, the address has to be
634: relocated first). */
1.1.1.3 root 635: if (get_user_ual(relval, reloc + i * sizeof(abi_ulong)))
636: return -EFAULT;
1.1 root 637: addr = flat_get_relocate_addr(relval);
638: rp = calc_reloc(addr, libinfo, id, 1);
639: if (rp == RELOC_FAILED)
640: return -ENOEXEC;
641:
642: /* Get the pointer's value. */
1.1.1.3 root 643: if (get_user_ual(addr, rp))
644: return -EFAULT;
1.1 root 645: if (addr != 0) {
646: /*
647: * Do the relocation. PIC relocs in the data section are
648: * already in target order
649: */
650:
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;
658:
659: /* Write back the relocated pointer. */
1.1.1.3 root 660: if (put_user_ual(addr, rp))
661: return -EFAULT;
1.1 root 662: }
663: }
664: } else {
665: for (i = 0; i < relocs; i++) {
1.1.1.3 root 666: abi_ulong relval;
667: if (get_user_ual(relval, reloc + i * sizeof(abi_ulong)))
668: return -EFAULT;
1.1 root 669: old_reloc(&libinfo[0], relval);
670: }
671: }
1.1.1.3 root 672:
1.1 root 673: /* zero the BSS. */
1.1.1.4 ! root 674: memset((void *)((unsigned long)datapos + data_len), 0, bss_len);
1.1 root 675:
676: return 0;
677: }
678:
679:
680: /****************************************************************************/
681: #ifdef CONFIG_BINFMT_SHARED_FLAT
682:
683: /*
684: * Load a shared library into memory. The library gets its own data
685: * segment (including bss) but not argv/argc/environ.
686: */
687:
688: static int load_flat_shared_library(int id, struct lib_info *libs)
689: {
690: struct linux_binprm bprm;
691: int res;
692: char buf[16];
693:
694: /* Create the file name */
695: sprintf(buf, "/lib/lib%d.so", id);
696:
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;
703:
704: res = prepare_binprm(&bprm);
705:
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;
712: }
713: return(res);
714: }
715:
716: #endif /* CONFIG_BINFMT_SHARED_FLAT */
717:
718: int load_flt_binary(struct linux_binprm * bprm, struct target_pt_regs * regs,
719: struct image_info * info)
720: {
721: struct lib_info libinfo[MAX_SHARED_LIBS];
1.1.1.3 root 722: abi_ulong p = bprm->p;
723: abi_ulong stack_len;
724: abi_ulong start_addr;
725: abi_ulong sp;
1.1 root 726: int res;
727: int i, j;
728:
729: memset(libinfo, 0, sizeof(libinfo));
730: /*
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.
736: */
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 */
741:
1.1.1.3 root 742:
1.1 root 743: res = load_flat_file(bprm, libinfo, 0, &stack_len);
744: if (res > (unsigned long)-4096)
745: return res;
1.1.1.3 root 746:
1.1 root 747: /* Update data segment pointers for all libraries */
748: for (i=0; i<MAX_SHARED_LIBS; i++) {
749: if (libinfo[i].loaded) {
1.1.1.3 root 750: abi_ulong p;
1.1 root 751: p = libinfo[i].start_data;
752: for (j=0; j<MAX_SHARED_LIBS; j++) {
753: p -= 4;
1.1.1.3 root 754: /* FIXME - handle put_user() failures */
755: if (put_user_ual(libinfo[j].loaded
756: ? libinfo[j].start_data
757: : UNLOADED_LIB,
758: p))
759: return -EFAULT;
1.1 root 760: }
761: }
762: }
763:
764: p = ((libinfo[0].start_brk + stack_len + 3) & ~3) - 4;
765: DBG_FLT("p=%x\n", (int)p);
766:
767: /* Copy argv/envp. */
768: p = copy_strings(p, bprm->envc, bprm->envp);
1.1.1.2 root 769: p = copy_strings(p, bprm->argc, bprm->argv);
1.1 root 770: /* Align stack. */
1.1.1.3 root 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);
1.1 root 779: sp = loader_build_argptr(bprm->envc, bprm->argc, sp, p, 1);
1.1.1.3 root 780:
1.1 root 781: /* Fake some return addresses to ensure the call chain will
782: * initialise library in order for us. We are required to call
783: * lib 1 first, then 2, ... and finally the main program (id 0).
784: */
785: start_addr = libinfo[0].entry;
786:
787: #ifdef CONFIG_BINFMT_SHARED_FLAT
788: #error here
789: for (i = MAX_SHARED_LIBS-1; i>0; i--) {
790: if (libinfo[i].loaded) {
791: /* Push previos first to call address */
1.1.1.3 root 792: --sp;
793: if (put_user_ual(start_addr, sp))
794: return -EFAULT;
1.1 root 795: start_addr = libinfo[i].entry;
796: }
797: }
798: #endif
1.1.1.3 root 799:
1.1 root 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;
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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