linux-user/flatload.c

   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, see <http://www.gnu.org/licenses/>.
  17  *
  18  *      Copyright (C) 2006 CodeSourcery.
  19  *      Copyright (C) 2000-2003 David McCullough <davidm@snapgear.com>
  20  *      Copyright (C) 2002 Greg Ungerer <gerg@snapgear.com>
  21  *      Copyright (C) 2002 SnapGear, by Paul Dale <pauli@snapgear.com>
  22  *      Copyright (C) 2000, 2001 Lineo, by David McCullough <davidm@lineo.com>
  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 <kjahds@kjahds.com>
  29  *      JAN/99 -- coded full program relocation (gerg@snapgear.com)
  30  */
  31
  32 /* ??? ZFLAT and shared library support is currently disabled.  */
  33
  34 /****************************************************************************/
  35
  36 #include "qemu/osdep.h"
  37
  38 #include "qemu.h"
  39 #include "flat.h"
  40 #include "target_flat.h"
  41
  42 //#define DEBUG
  43
  44 #ifdef DEBUG
  45 #define DBG_FLT(...)    printf(__VA_ARGS__)
  46 #else
  47 #define DBG_FLT(...)
  48 #endif
  49
  50 #define RELOC_FAILED 0xff00ff01         /* Relocation incorrect somewhere */
  51 #define UNLOADED_LIB 0x7ff000ff         /* Placeholder for unused library */
  52
  53 struct lib_info {
  54     abi_ulong start_code;       /* Start of text segment */
  55     abi_ulong start_data;       /* Start of data segment */
  56     abi_ulong end_data;         /* Start of bss section */
  57     abi_ulong start_brk;        /* End of data segment */
  58     abi_ulong text_len;         /* Length of text segment */
  59     abi_ulong entry;            /* Start address for this module */
  60     abi_ulong build_date;       /* When this one was compiled */
  61     short loaded;               /* Has this library been loaded? */
  62 };
  63
  64 #ifdef CONFIG_BINFMT_SHARED_FLAT
  65 static int load_flat_shared_library(int id, struct lib_info *p);
  66 #endif
  67
  68 struct linux_binprm;
  69
  70 /****************************************************************************/
  71 /*
  72  * create_flat_tables() parses the env- and arg-strings in new user
  73  * memory and creates the pointer tables from them, and puts their
  74  * addresses on the "stack", returning the new stack pointer value.
  75  */
  76
  77 /* Push a block of strings onto the guest stack.  */
  78 static abi_ulong copy_strings(abi_ulong p, int n, char **s)
  79 {
  80     int len;
  81
  82     while (n-- > 0) {
  83         len = strlen(s[n]) + 1;
  84         p -= len;
  85         memcpy_to_target(p, s[n], len);
  86     }
  87
  88     return p;
  89 }
  90
  91 static int target_pread(int fd, abi_ulong ptr, abi_ulong len,
  92                         abi_ulong offset)
  93 {
  94     void *buf;
  95     int ret;
  96
  97     buf = lock_user(VERIFY_WRITE, ptr, len, 0);
  98     ret = pread(fd, buf, len, offset);
  99     unlock_user(buf, ptr, len);
 100     return ret;
 101 }
 102 /****************************************************************************/
 103
 104 #ifdef CONFIG_BINFMT_ZFLAT
 105
 106 #include <linux/zlib.h>
 107
 108 #define LBUFSIZE        4000
 109
 110 /* gzip flag byte */
 111 #define ASCII_FLAG   0x01 /* bit 0 set: file probably ASCII text */
 112 #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
 113 #define EXTRA_FIELD  0x04 /* bit 2 set: extra field present */
 114 #define ORIG_NAME    0x08 /* bit 3 set: original file name present */
 115 #define COMMENT      0x10 /* bit 4 set: file comment present */
 116 #define ENCRYPTED    0x20 /* bit 5 set: file is encrypted */
 117 #define RESERVED     0xC0 /* bit 6,7:   reserved */
 118
 119 static int decompress_exec(
 120         struct linux_binprm *bprm,
 121         unsigned long offset,
 122         char *dst,
 123         long len,
 124         int fd)
 125 {
 126         unsigned char *buf;
 127         z_stream strm;
 128         loff_t fpos;
 129         int ret, retval;
 130
 131         DBG_FLT("decompress_exec(offset=%x,buf=%x,len=%x)\n",(int)offset, (int)dst, (int)len);
 132
 133         memset(&strm, 0, sizeof(strm));
 134         strm.workspace = kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL);
 135         if (strm.workspace == NULL) {
 136                 DBG_FLT("binfmt_flat: no memory for decompress workspace\n");
 137                 return -ENOMEM;
 138         }
 139         buf = kmalloc(LBUFSIZE, GFP_KERNEL);
 140         if (buf == NULL) {
 141                 DBG_FLT("binfmt_flat: no memory for read buffer\n");
 142                 retval = -ENOMEM;
 143                 goto out_free;
 144         }
 145
 146         /* Read in first chunk of data and parse gzip header. */
 147         fpos = offset;
 148         ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos);
 149
 150         strm.next_in = buf;
 151         strm.avail_in = ret;
 152         strm.total_in = 0;
 153
 154         retval = -ENOEXEC;
 155
 156         /* Check minimum size -- gzip header */
 157         if (ret < 10) {
 158                 DBG_FLT("binfmt_flat: file too small?\n");
 159                 goto out_free_buf;
 160         }
 161
 162         /* Check gzip magic number */
 163         if ((buf[0] != 037) || ((buf[1] != 0213) && (buf[1] != 0236))) {
 164                 DBG_FLT("binfmt_flat: unknown compression magic?\n");
 165                 goto out_free_buf;
 166         }
 167
 168         /* Check gzip method */
 169         if (buf[2] != 8) {
 170                 DBG_FLT("binfmt_flat: unknown compression method?\n");
 171                 goto out_free_buf;
 172         }
 173         /* Check gzip flags */
 174         if ((buf[3] & ENCRYPTED) || (buf[3] & CONTINUATION) ||
 175             (buf[3] & RESERVED)) {
 176                 DBG_FLT("binfmt_flat: unknown flags?\n");
 177                 goto out_free_buf;
 178         }
 179
 180         ret = 10;
 181         if (buf[3] & EXTRA_FIELD) {
 182                 ret += 2 + buf[10] + (buf[11] << 8);
 183                 if (unlikely(LBUFSIZE == ret)) {
 184                         DBG_FLT("binfmt_flat: buffer overflow (EXTRA)?\n");
 185                         goto out_free_buf;
 186                 }
 187         }
 188         if (buf[3] & ORIG_NAME) {
 189                 for (; ret < LBUFSIZE && (buf[ret] != 0); ret++)
 190                         ;
 191                 if (unlikely(LBUFSIZE == ret)) {
 192                         DBG_FLT("binfmt_flat: buffer overflow (ORIG_NAME)?\n");
 193                         goto out_free_buf;
 194                 }
 195         }
 196         if (buf[3] & COMMENT) {
 197                 for (;  ret < LBUFSIZE && (buf[ret] != 0); ret++)
 198                         ;
 199                 if (unlikely(LBUFSIZE == ret)) {
 200                         DBG_FLT("binfmt_flat: buffer overflow (COMMENT)?\n");
 201                         goto out_free_buf;
 202                 }
 203         }
 204
 205         strm.next_in += ret;
 206         strm.avail_in -= ret;
 207
 208         strm.next_out = dst;
 209         strm.avail_out = len;
 210         strm.total_out = 0;
 211
 212         if (zlib_inflateInit2(&strm, -MAX_WBITS) != Z_OK) {
 213                 DBG_FLT("binfmt_flat: zlib init failed?\n");
 214                 goto out_free_buf;
 215         }
 216
 217         while ((ret = zlib_inflate(&strm, Z_NO_FLUSH)) == Z_OK) {
 218                 ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos);
 219                 if (ret <= 0)
 220                         break;
 221                 if (ret >= (unsigned long) -4096)
 222                         break;
 223                 len -= ret;
 224
 225                 strm.next_in = buf;
 226                 strm.avail_in = ret;
 227                 strm.total_in = 0;
 228         }
 229
 230         if (ret < 0) {
 231                 DBG_FLT("binfmt_flat: decompression failed (%d), %s\n",
 232                         ret, strm.msg);
 233                 goto out_zlib;
 234         }
 235
 236         retval = 0;
 237 out_zlib:
 238         zlib_inflateEnd(&strm);
 239 out_free_buf:
 240         kfree(buf);
 241 out_free:
 242         kfree(strm.workspace);
 243 out:
 244         return retval;
 245 }
 246
 247 #endif /* CONFIG_BINFMT_ZFLAT */
 248
 249 /****************************************************************************/
 250
 251 static abi_ulong
 252 calc_reloc(abi_ulong r, struct lib_info *p, int curid, int internalp)
 253 {
 254     abi_ulong addr;
 255     int id;
 256     abi_ulong start_brk;
 257     abi_ulong start_data;
 258     abi_ulong text_len;
 259     abi_ulong start_code;
 260
 261 #ifdef CONFIG_BINFMT_SHARED_FLAT
 262 #error needs checking
 263     if (r == 0)
 264         id = curid;     /* Relocs of 0 are always self referring */
 265     else {
 266         id = (r >> 24) & 0xff;  /* Find ID for this reloc */
 267         r &= 0x00ffffff;        /* Trim ID off here */
 268     }
 269     if (id >= MAX_SHARED_LIBS) {
 270         fprintf(stderr, "BINFMT_FLAT: reference 0x%x to shared library %d\n",
 271                 (unsigned) r, id);
 272         goto failed;
 273     }
 274     if (curid != id) {
 275         if (internalp) {
 276             fprintf(stderr, "BINFMT_FLAT: reloc address 0x%x not "
 277                     "in same module (%d != %d)\n",
 278                     (unsigned) r, curid, id);
 279             goto failed;
 280         } else if ( ! p[id].loaded &&
 281                     load_flat_shared_library(id, p) > (unsigned long) -4096) {
 282             fprintf(stderr, "BINFMT_FLAT: failed to load library %d\n", id);
 283             goto failed;
 284         }
 285         /* Check versioning information (i.e. time stamps) */
 286         if (p[id].build_date && p[curid].build_date
 287             && p[curid].build_date < p[id].build_date) {
 288             fprintf(stderr, "BINFMT_FLAT: library %d is younger than %d\n",
 289                     id, curid);
 290             goto failed;
 291         }
 292     }
 293 #else
 294     id = 0;
 295 #endif
 296
 297     start_brk = p[id].start_brk;
 298     start_data = p[id].start_data;
 299     start_code = p[id].start_code;
 300     text_len = p[id].text_len;
 301
 302     if (!flat_reloc_valid(r, start_brk - start_data + text_len)) {
 303         fprintf(stderr, "BINFMT_FLAT: reloc outside program 0x%x "
 304                 "(0 - 0x%x/0x%x)\n",
 305                (int) r,(int)(start_brk-start_code),(int)text_len);
 306         goto failed;
 307     }
 308
 309     if (r < text_len)                   /* In text segment */
 310         addr = r + start_code;
 311     else                                        /* In data segment */
 312         addr = r - text_len + start_data;
 313
 314     /* Range checked already above so doing the range tests is redundant...*/
 315     return(addr);
 316
 317 failed:
 318     abort();
 319     return RELOC_FAILED;
 320 }
 321
 322 /****************************************************************************/
 323
 324 /* ??? This does not handle endianness correctly.  */
 325 static void old_reloc(struct lib_info *libinfo, uint32_t rl)
 326 {
 327 #ifdef DEBUG
 328         const char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" };
 329 #endif
 330         uint32_t *ptr;
 331         uint32_t offset;
 332         int reloc_type;
 333
 334         offset = rl & 0x3fffffff;
 335         reloc_type = rl >> 30;
 336         /* ??? How to handle this?  */
 337 #if defined(CONFIG_COLDFIRE)
 338         ptr = (uint32_t *) ((unsigned long) libinfo->start_code + offset);
 339 #else
 340         ptr = (uint32_t *) ((unsigned long) libinfo->start_data + offset);
 341 #endif
 342
 343 #ifdef DEBUG
 344         fprintf(stderr, "Relocation of variable at DATASEG+%x "
 345                 "(address %p, currently %x) into segment %s\n",
 346                 offset, ptr, (int)*ptr, segment[reloc_type]);
 347 #endif
 348
 349         switch (reloc_type) {
 350         case OLD_FLAT_RELOC_TYPE_TEXT:
 351                 *ptr += libinfo->start_code;
 352                 break;
 353         case OLD_FLAT_RELOC_TYPE_DATA:
 354                 *ptr += libinfo->start_data;
 355                 break;
 356         case OLD_FLAT_RELOC_TYPE_BSS:
 357                 *ptr += libinfo->end_data;
 358                 break;
 359         default:
 360                 fprintf(stderr, "BINFMT_FLAT: Unknown relocation type=%x\n",
 361                         reloc_type);
 362                 break;
 363         }
 364         DBG_FLT("Relocation became %x\n", (int)*ptr);
 365 }
 366
 367 /****************************************************************************/
 368
 369 static int load_flat_file(struct linux_binprm * bprm,
 370                 struct lib_info *libinfo, int id, abi_ulong *extra_stack)
 371 {
 372     struct flat_hdr * hdr;
 373     abi_ulong textpos = 0, datapos = 0;
 374     abi_long result;
 375     abi_ulong realdatastart = 0;
 376     abi_ulong text_len, data_len, bss_len, stack_len, flags;
 377     abi_ulong extra;
 378     abi_ulong reloc = 0, rp;
 379     int i, rev, relocs = 0;
 380     abi_ulong fpos;
 381     abi_ulong start_code;
 382     abi_ulong indx_len;
 383
 384     hdr = ((struct flat_hdr *) bprm->buf);              /* exec-header */
 385
 386     text_len  = ntohl(hdr->data_start);
 387     data_len  = ntohl(hdr->data_end) - ntohl(hdr->data_start);
 388     bss_len   = ntohl(hdr->bss_end) - ntohl(hdr->data_end);
 389     stack_len = ntohl(hdr->stack_size);
 390     if (extra_stack) {
 391         stack_len += *extra_stack;
 392         *extra_stack = stack_len;
 393     }
 394     relocs    = ntohl(hdr->reloc_count);
 395     flags     = ntohl(hdr->flags);
 396     rev       = ntohl(hdr->rev);
 397
 398     DBG_FLT("BINFMT_FLAT: Loading file: %s\n", bprm->filename);
 399
 400     if (rev != FLAT_VERSION && rev != OLD_FLAT_VERSION) {
 401         fprintf(stderr, "BINFMT_FLAT: bad magic/rev (0x%x, need 0x%x)\n",
 402                 rev, (int) FLAT_VERSION);
 403         return -ENOEXEC;
 404     }
 405
 406     /* Don't allow old format executables to use shared libraries */
 407     if (rev == OLD_FLAT_VERSION && id != 0) {
 408         fprintf(stderr, "BINFMT_FLAT: shared libraries are not available\n");
 409         return -ENOEXEC;
 410     }
 411
 412     /*
 413      * fix up the flags for the older format,  there were all kinds
 414      * of endian hacks,  this only works for the simple cases
 415      */
 416     if (rev == OLD_FLAT_VERSION && flat_old_ram_flag(flags))
 417         flags = FLAT_FLAG_RAM;
 418
 419 #ifndef CONFIG_BINFMT_ZFLAT
 420     if (flags & (FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA)) {
 421         fprintf(stderr, "Support for ZFLAT executables is not enabled\n");
 422         return -ENOEXEC;
 423     }
 424 #endif
 425
 426     /*
 427      * calculate the extra space we need to map in
 428      */
 429     extra = relocs * sizeof(abi_ulong);
 430     if (extra < bss_len + stack_len)
 431         extra = bss_len + stack_len;
 432
 433     /* Add space for library base pointers.  Make sure this does not
 434        misalign the  doesn't misalign the data segment.  */
 435     indx_len = MAX_SHARED_LIBS * sizeof(abi_ulong);
 436     indx_len = (indx_len + 15) & ~(abi_ulong)15;
 437
 438     /*
 439      * there are a couple of cases here,  the separate code/data
 440      * case,  and then the fully copied to RAM case which lumps
 441      * it all together.
 442      */
 443     if ((flags & (FLAT_FLAG_RAM|FLAT_FLAG_GZIP)) == 0) {
 444         /*
 445          * this should give us a ROM ptr,  but if it doesn't we don't
 446          * really care
 447          */
 448         DBG_FLT("BINFMT_FLAT: ROM mapping of file (we hope)\n");
 449
 450         textpos = target_mmap(0, text_len, PROT_READ|PROT_EXEC,
 451                               MAP_PRIVATE, bprm->fd, 0);
 452         if (textpos == -1) {
 453             fprintf(stderr, "Unable to mmap process text\n");
 454             return -1;
 455         }
 456
 457         realdatastart = target_mmap(0, data_len + extra + indx_len,
 458                                     PROT_READ|PROT_WRITE|PROT_EXEC,
 459                                     MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
 460
 461         if (realdatastart == -1) {
 462             fprintf(stderr, "Unable to allocate RAM for process data\n");
 463             return realdatastart;
 464         }
 465         datapos = realdatastart + indx_len;
 466
 467         DBG_FLT("BINFMT_FLAT: Allocated data+bss+stack (%d bytes): %x\n",
 468                         (int)(data_len + bss_len + stack_len), (int)datapos);
 469
 470         fpos = ntohl(hdr->data_start);
 471 #ifdef CONFIG_BINFMT_ZFLAT
 472         if (flags & FLAT_FLAG_GZDATA) {
 473             result = decompress_exec(bprm, fpos, (char *) datapos,
 474                                      data_len + (relocs * sizeof(abi_ulong)))
 475         } else
 476 #endif
 477         {
 478             result = target_pread(bprm->fd, datapos,
 479                                   data_len + (relocs * sizeof(abi_ulong)),
 480                                   fpos);
 481         }
 482         if (result < 0) {
 483             fprintf(stderr, "Unable to read data+bss\n");
 484             return result;
 485         }
 486
 487         reloc = datapos + (ntohl(hdr->reloc_start) - text_len);
 488
 489     } else {
 490
 491         textpos = target_mmap(0, text_len + data_len + extra + indx_len,
 492                               PROT_READ | PROT_EXEC | PROT_WRITE,
 493                               MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
 494         if (textpos == -1 ) {
 495             fprintf(stderr, "Unable to allocate RAM for process text/data\n");
 496             return -1;
 497         }
 498
 499         realdatastart = textpos + ntohl(hdr->data_start);
 500         datapos = realdatastart + indx_len;
 501         reloc = (textpos + ntohl(hdr->reloc_start) + indx_len);
 502
 503 #ifdef CONFIG_BINFMT_ZFLAT
 504 #error code needs checking
 505         /*
 506          * load it all in and treat it like a RAM load from now on
 507          */
 508         if (flags & FLAT_FLAG_GZIP) {
 509                 result = decompress_exec(bprm, sizeof (struct flat_hdr),
 510                                  (((char *) textpos) + sizeof (struct flat_hdr)),
 511                                  (text_len + data_len + (relocs * sizeof(unsigned long))
 512                                           - sizeof (struct flat_hdr)),
 513                                  0);
 514                 memmove((void *) datapos, (void *) realdatastart,
 515                                 data_len + (relocs * sizeof(unsigned long)));
 516         } else if (flags & FLAT_FLAG_GZDATA) {
 517                 fpos = 0;
 518                 result = bprm->file->f_op->read(bprm->file,
 519                                 (char *) textpos, text_len, &fpos);
 520                 if (result < (unsigned long) -4096)
 521                         result = decompress_exec(bprm, text_len, (char *) datapos,
 522                                          data_len + (relocs * sizeof(unsigned long)), 0);
 523         }
 524         else
 525 #endif
 526         {
 527             result = target_pread(bprm->fd, textpos,
 528                                   text_len, 0);
 529             if (result >= 0) {
 530                 result = target_pread(bprm->fd, datapos,
 531                     data_len + (relocs * sizeof(abi_ulong)),
 532                     ntohl(hdr->data_start));
 533             }
 534         }
 535         if (result < 0) {
 536             fprintf(stderr, "Unable to read code+data+bss\n");
 537             return result;
 538         }
 539     }
 540
 541     DBG_FLT("Mapping is 0x%x, Entry point is 0x%x, data_start is 0x%x\n",
 542             (int)textpos, 0x00ffffff&ntohl(hdr->entry),
 543             ntohl(hdr->data_start));
 544
 545     /* The main program needs a little extra setup in the task structure */
 546     start_code = textpos + sizeof (struct flat_hdr);
 547
 548     DBG_FLT("%s %s: TEXT=%x-%x DATA=%x-%x BSS=%x-%x\n",
 549             id ? "Lib" : "Load", bprm->filename,
 550             (int) start_code, (int) (textpos + text_len),
 551             (int) datapos,
 552             (int) (datapos + data_len),
 553             (int) (datapos + data_len),
 554             (int) (((datapos + data_len + bss_len) + 3) & ~3));
 555
 556     text_len -= sizeof(struct flat_hdr); /* the real code len */
 557
 558     /* Store the current module values into the global library structure */
 559     libinfo[id].start_code = start_code;
 560     libinfo[id].start_data = datapos;
 561     libinfo[id].end_data = datapos + data_len;
 562     libinfo[id].start_brk = datapos + data_len + bss_len;
 563     libinfo[id].text_len = text_len;
 564     libinfo[id].loaded = 1;
 565     libinfo[id].entry = (0x00ffffff & ntohl(hdr->entry)) + textpos;
 566     libinfo[id].build_date = ntohl(hdr->build_date);
 567
 568     /*
 569      * We just load the allocations into some temporary memory to
 570      * help simplify all this mumbo jumbo
 571      *
 572      * We've got two different sections of relocation entries.
 573      * The first is the GOT which resides at the beginning of the data segment
 574      * and is terminated with a -1.  This one can be relocated in place.
 575      * The second is the extra relocation entries tacked after the image's
 576      * data segment. These require a little more processing as the entry is
 577      * really an offset into the image which contains an offset into the
 578      * image.
 579      */
 580     if (flags & FLAT_FLAG_GOTPIC) {
 581         rp = datapos;
 582         while (1) {
 583             abi_ulong addr;
 584             if (get_user_ual(addr, rp))
 585                 return -EFAULT;
 586             if (addr == -1)
 587                 break;
 588             if (addr) {
 589                 addr = calc_reloc(addr, libinfo, id, 0);
 590                 if (addr == RELOC_FAILED)
 591                     return -ENOEXEC;
 592                 if (put_user_ual(addr, rp))
 593                     return -EFAULT;
 594             }
 595             rp += sizeof(abi_ulong);
 596         }
 597     }
 598
 599     /*
 600      * Now run through the relocation entries.
 601      * We've got to be careful here as C++ produces relocatable zero
 602      * entries in the constructor and destructor tables which are then
 603      * tested for being not zero (which will always occur unless we're
 604      * based from address zero).  This causes an endless loop as __start
 605      * is at zero.  The solution used is to not relocate zero addresses.
 606      * This has the negative side effect of not allowing a global data
 607      * reference to be statically initialised to _stext (I've moved
 608      * __start to address 4 so that is okay).
 609      */
 610     if (rev > OLD_FLAT_VERSION) {
 611         abi_ulong persistent = 0;
 612         for (i = 0; i < relocs; i++) {
 613             abi_ulong addr, relval;
 614
 615             /* Get the address of the pointer to be
 616                relocated (of course, the address has to be
 617                relocated first).  */
 618             if (get_user_ual(relval, reloc + i * sizeof(abi_ulong)))
 619                 return -EFAULT;
 620             relval = ntohl(relval);
 621             if (flat_set_persistent(relval, &persistent))
 622                 continue;
 623             addr = flat_get_relocate_addr(relval);
 624             rp = calc_reloc(addr, libinfo, id, 1);
 625             if (rp == RELOC_FAILED)
 626                 return -ENOEXEC;
 627
 628             /* Get the pointer's value.  */
 629             if (get_user_ual(addr, rp))
 630                 return -EFAULT;
 631             addr = flat_get_addr_from_rp(addr, relval, flags, &persistent);
 632             if (addr != 0) {
 633                 /*
 634                  * Do the relocation.  PIC relocs in the data section are
 635                  * already in target order
 636                  */
 637                 if ((flags & FLAT_FLAG_GOTPIC) == 0)
 638                     addr = ntohl(addr);
 639                 addr = calc_reloc(addr, libinfo, id, 0);
 640                 if (addr == RELOC_FAILED)
 641                     return -ENOEXEC;
 642
 643                 /* Write back the relocated pointer.  */
 644                 if (flat_put_addr_at_rp(rp, addr, relval))
 645                     return -EFAULT;
 646             }
 647         }
 648     } else {
 649         for (i = 0; i < relocs; i++) {
 650             abi_ulong relval;
 651             if (get_user_ual(relval, reloc + i * sizeof(abi_ulong)))
 652                 return -EFAULT;
 653             old_reloc(&libinfo[0], relval);
 654         }
 655     }
 656
 657     /* zero the BSS.  */
 658     memset(g2h(datapos + data_len), 0, bss_len);
 659
 660     return 0;
 661 }
 662
 663
 664 /****************************************************************************/
 665 #ifdef CONFIG_BINFMT_SHARED_FLAT
 666
 667 /*
 668  * Load a shared library into memory.  The library gets its own data
 669  * segment (including bss) but not argv/argc/environ.
 670  */
 671
 672 static int load_flat_shared_library(int id, struct lib_info *libs)
 673 {
 674         struct linux_binprm bprm;
 675         int res;
 676         char buf[16];
 677
 678         /* Create the file name */
 679         sprintf(buf, "/lib/lib%d.so", id);
 680
 681         /* Open the file up */
 682         bprm.filename = buf;
 683         bprm.file = open_exec(bprm.filename);
 684         res = PTR_ERR(bprm.file);
 685         if (IS_ERR(bprm.file))
 686                 return res;
 687
 688         res = prepare_binprm(&bprm);
 689
 690         if (res <= (unsigned long)-4096)
 691                 res = load_flat_file(&bprm, libs, id, NULL);
 692         if (bprm.file) {
 693                 allow_write_access(bprm.file);
 694                 fput(bprm.file);
 695                 bprm.file = NULL;
 696         }
 697         return(res);
 698 }
 699
 700 #endif /* CONFIG_BINFMT_SHARED_FLAT */
 701
 702 int load_flt_binary(struct linux_binprm *bprm, struct image_info *info)
 703 {
 704     struct lib_info libinfo[MAX_SHARED_LIBS];
 705     abi_ulong p;
 706     abi_ulong stack_len;
 707     abi_ulong start_addr;
 708     abi_ulong sp;
 709     int res;
 710     int i, j;
 711
 712     memset(libinfo, 0, sizeof(libinfo));
 713     /*
 714      * We have to add the size of our arguments to our stack size
 715      * otherwise it's too easy for users to create stack overflows
 716      * by passing in a huge argument list.  And yes,  we have to be
 717      * pedantic and include space for the argv/envp array as it may have
 718      * a lot of entries.
 719      */
 720     stack_len = 0;
 721     for (i = 0; i < bprm->argc; ++i) {
 722         /* the argv strings */
 723         stack_len += strlen(bprm->argv[i]);
 724     }
 725     for (i = 0; i < bprm->envc; ++i) {
 726         /* the envp strings */
 727         stack_len += strlen(bprm->envp[i]);
 728     }
 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             abi_ulong p;
 741             p = libinfo[i].start_data;
 742             for (j=0; j<MAX_SHARED_LIBS; j++) {
 743                 p -= 4;
 744                 /* FIXME - handle put_user() failures */
 745                 if (put_user_ual(libinfo[j].loaded
 746                                  ? libinfo[j].start_data
 747                                  : UNLOADED_LIB,
 748                                  p))
 749                     return -EFAULT;
 750             }
 751         }
 752     }
 753
 754     p = ((libinfo[0].start_brk + stack_len + 3) & ~3) - 4;
 755     DBG_FLT("p=%x\n", (int)p);
 756
 757     /* Copy argv/envp.  */
 758     p = copy_strings(p, bprm->envc, bprm->envp);
 759     p = copy_strings(p, bprm->argc, bprm->argv);
 760     /* Align stack.  */
 761     sp = p & ~(abi_ulong)(sizeof(abi_ulong) - 1);
 762     /* Enforce final stack alignment of 16 bytes.  This is sufficient
 763        for all current targets, and excess alignment is harmless.  */
 764     stack_len = bprm->envc + bprm->argc + 2;
 765     stack_len += 3;     /* argc, arvg, argp */
 766     stack_len *= sizeof(abi_ulong);
 767     if ((sp + stack_len) & 15)
 768         sp -= 16 - ((sp + stack_len) & 15);
 769     sp = loader_build_argptr(bprm->envc, bprm->argc, sp, p,
 770                              flat_argvp_envp_on_stack());
 771
 772     /* Fake some return addresses to ensure the call chain will
 773      * initialise library in order for us.  We are required to call
 774      * lib 1 first, then 2, ... and finally the main program (id 0).
 775      */
 776     start_addr = libinfo[0].entry;
 777
 778 #ifdef CONFIG_BINFMT_SHARED_FLAT
 779 #error here
 780     for (i = MAX_SHARED_LIBS-1; i>0; i--) {
 781             if (libinfo[i].loaded) {
 782                     /* Push previos first to call address */
 783                     --sp;
 784                     if (put_user_ual(start_addr, sp))
 785                         return -EFAULT;
 786                     start_addr = libinfo[i].entry;
 787             }
 788     }
 789 #endif
 790
 791     /* Stash our initial stack pointer into the mm structure */
 792     info->start_code = libinfo[0].start_code;
 793     info->end_code = libinfo[0].start_code = libinfo[0].text_len;
 794     info->start_data = libinfo[0].start_data;
 795     info->end_data = libinfo[0].end_data;
 796     info->start_brk = libinfo[0].start_brk;
 797     info->start_stack = sp;
 798     info->stack_limit = libinfo[0].start_brk;
 799     info->entry = start_addr;
 800     info->code_offset = info->start_code;
 801     info->data_offset = info->start_data - libinfo[0].text_len;
 802
 803     DBG_FLT("start_thread(entry=0x%x, start_stack=0x%x)\n",
 804             (int)info->entry, (int)info->start_stack);
 805
 806     return 0;
 807 }