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 #include <sys/mman.h>
  38
  39 #include "qemu.h"
  40 #include "flat.h"
  41 #include <target_flat.h>
  42
  43 //#define DEBUG
  44
  45 #ifdef DEBUG
  46 #define DBG_FLT(...)    printf(__VA_ARGS__)
  47 #else
  48 #define DBG_FLT(...)
  49 #endif
  50
  51 #define RELOC_FAILED 0xff00ff01         /* Relocation incorrect somewhere */
  52 #define UNLOADED_LIB 0x7ff000ff         /* Placeholder for unused library */
  53
  54 struct lib_info {
  55     abi_ulong start_code;       /* Start of text segment */
  56     abi_ulong start_data;       /* Start of data segment */
  57     abi_ulong end_data;         /* Start of bss section */
  58     abi_ulong start_brk;        /* End of data segment */
  59     abi_ulong text_len;         /* Length of text segment */
  60     abi_ulong entry;            /* Start address for this module */
  61     abi_ulong build_date;       /* When this one was compiled */
  62     short loaded;               /* Has this library been loaded? */
  63 };
  64
  65 #ifdef CONFIG_BINFMT_SHARED_FLAT
  66 static int load_flat_shared_library(int id, struct lib_info *p);
  67 #endif
  68
  69 struct linux_binprm;
  70
  71 /****************************************************************************/
  72 /*
  73  * create_flat_tables() parses the env- and arg-strings in new user
  74  * memory and creates the pointer tables from them, and puts their
  75  * addresses on the "stack", returning the new stack pointer value.
  76  */
  77
  78 /* Push a block of strings onto the guest stack.  */
  79 static abi_ulong copy_strings(abi_ulong p, int n, char **s)
  80 {
  81     int len;
  82
  83     while (n-- > 0) {
  84         len = strlen(s[n]) + 1;
  85         p -= len;
  86         memcpy_to_target(p, s[n], len);
  87     }
  88
  89     return p;
  90 }
  91
  92 static int target_pread(int fd, abi_ulong ptr, abi_ulong len,
  93                         abi_ulong offset)
  94 {
  95     void *buf;
  96     int ret;
  97
  98     buf = lock_user(VERIFY_WRITE, ptr, len, 0);
  99     ret = pread(fd, buf, len, offset);
 100     unlock_user(buf, ptr, len);
 101     return ret;
 102 }
 103 /****************************************************************************/
 104
 105 #ifdef CONFIG_BINFMT_ZFLAT
 106
 107 #include <linux/zlib.h>
 108
 109 #define LBUFSIZE        4000
 110
 111 /* gzip flag byte */
 112 #define ASCII_FLAG   0x01 /* bit 0 set: file probably ASCII text */
 113 #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
 114 #define EXTRA_FIELD  0x04 /* bit 2 set: extra field present */
 115 #define ORIG_NAME    0x08 /* bit 3 set: original file name present */
 116 #define COMMENT      0x10 /* bit 4 set: file comment present */
 117 #define ENCRYPTED    0x20 /* bit 5 set: file is encrypted */
 118 #define RESERVED     0xC0 /* bit 6,7:   reserved */
 119
 120 static int decompress_exec(
 121         struct linux_binprm *bprm,
 122         unsigned long offset,
 123         char *dst,
 124         long len,
 125         int fd)
 126 {
 127         unsigned char *buf;
 128         z_stream strm;
 129         loff_t fpos;
 130         int ret, retval;
 131
 132         DBG_FLT("decompress_exec(offset=%x,buf=%x,len=%x)\n",(int)offset, (int)dst, (int)len);
 133
 134         memset(&strm, 0, sizeof(strm));
 135         strm.workspace = kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL);
 136         if (strm.workspace == NULL) {
 137                 DBG_FLT("binfmt_flat: no memory for decompress workspace\n");
 138                 return -ENOMEM;
 139         }
 140         buf = kmalloc(LBUFSIZE, GFP_KERNEL);
 141         if (buf == NULL) {
 142                 DBG_FLT("binfmt_flat: no memory for read buffer\n");
 143                 retval = -ENOMEM;
 144                 goto out_free;
 145         }
 146
 147         /* Read in first chunk of data and parse gzip header. */
 148         fpos = offset;
 149         ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos);
 150
 151         strm.next_in = buf;
 152         strm.avail_in = ret;
 153         strm.total_in = 0;
 154
 155         retval = -ENOEXEC;
 156
 157         /* Check minimum size -- gzip header */
 158         if (ret < 10) {
 159                 DBG_FLT("binfmt_flat: file too small?\n");
 160                 goto out_free_buf;
 161         }
 162
 163         /* Check gzip magic number */
 164         if ((buf[0] != 037) || ((buf[1] != 0213) && (buf[1] != 0236))) {
 165                 DBG_FLT("binfmt_flat: unknown compression magic?\n");
 166                 goto out_free_buf;
 167         }
 168
 169         /* Check gzip method */
 170         if (buf[2] != 8) {
 171                 DBG_FLT("binfmt_flat: unknown compression method?\n");
 172                 goto out_free_buf;
 173         }
 174         /* Check gzip flags */
 175         if ((buf[3] & ENCRYPTED) || (buf[3] & CONTINUATION) ||
 176             (buf[3] & RESERVED)) {
 177                 DBG_FLT("binfmt_flat: unknown flags?\n");
 178                 goto out_free_buf;
 179         }
 180
 181         ret = 10;
 182         if (buf[3] & EXTRA_FIELD) {
 183                 ret += 2 + buf[10] + (buf[11] << 8);
 184                 if (unlikely(LBUFSIZE == ret)) {
 185                         DBG_FLT("binfmt_flat: buffer overflow (EXTRA)?\n");
 186                         goto out_free_buf;
 187                 }
 188         }
 189         if (buf[3] & ORIG_NAME) {
 190                 for (; ret < LBUFSIZE && (buf[ret] != 0); ret++)
 191                         ;
 192                 if (unlikely(LBUFSIZE == ret)) {
 193                         DBG_FLT("binfmt_flat: buffer overflow (ORIG_NAME)?\n");
 194                         goto out_free_buf;
 195                 }
 196         }
 197         if (buf[3] & COMMENT) {
 198                 for (;  ret < LBUFSIZE && (buf[ret] != 0); ret++)
 199                         ;
 200                 if (unlikely(LBUFSIZE == ret)) {
 201                         DBG_FLT("binfmt_flat: buffer overflow (COMMENT)?\n");
 202                         goto out_free_buf;
 203                 }
 204         }
 205
 206         strm.next_in += ret;
 207         strm.avail_in -= ret;
 208
 209         strm.next_out = dst;
 210         strm.avail_out = len;
 211         strm.total_out = 0;
 212
 213         if (zlib_inflateInit2(&strm, -MAX_WBITS) != Z_OK) {
 214                 DBG_FLT("binfmt_flat: zlib init failed?\n");
 215                 goto out_free_buf;
 216         }
 217
 218         while ((ret = zlib_inflate(&strm, Z_NO_FLUSH)) == Z_OK) {
 219                 ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos);
 220                 if (ret <= 0)
 221                         break;
 222                 if (ret >= (unsigned long) -4096)
 223                         break;
 224                 len -= ret;
 225
 226                 strm.next_in = buf;
 227                 strm.avail_in = ret;
 228                 strm.total_in = 0;
 229         }
 230
 231         if (ret < 0) {
 232                 DBG_FLT("binfmt_flat: decompression failed (%d), %s\n",
 233                         ret, strm.msg);
 234                 goto out_zlib;
 235         }
 236
 237         retval = 0;
 238 out_zlib:
 239         zlib_inflateEnd(&strm);
 240 out_free_buf:
 241         kfree(buf);
 242 out_free:
 243         kfree(strm.workspace);
 244 out:
 245         return retval;
 246 }
 247
 248 #endif /* CONFIG_BINFMT_ZFLAT */
 249
 250 /****************************************************************************/
 251
 252 static abi_ulong
 253 calc_reloc(abi_ulong r, struct lib_info *p, int curid, int internalp)
 254 {
 255     abi_ulong addr;
 256     int id;
 257     abi_ulong start_brk;
 258     abi_ulong start_data;
 259     abi_ulong text_len;
 260     abi_ulong start_code;
 261
 262 #ifdef CONFIG_BINFMT_SHARED_FLAT
 263 #error needs checking
 264     if (r == 0)
 265         id = curid;     /* Relocs of 0 are always self referring */
 266     else {
 267         id = (r >> 24) & 0xff;  /* Find ID for this reloc */
 268         r &= 0x00ffffff;        /* Trim ID off here */
 269     }
 270     if (id >= MAX_SHARED_LIBS) {
 271         fprintf(stderr, "BINFMT_FLAT: reference 0x%x to shared library %d\n",
 272                 (unsigned) r, id);
 273         goto failed;
 274     }
 275     if (curid != id) {
 276         if (internalp) {
 277             fprintf(stderr, "BINFMT_FLAT: reloc address 0x%x not "
 278                     "in same module (%d != %d)\n",
 279                     (unsigned) r, curid, id);
 280             goto failed;
 281         } else if ( ! p[id].loaded &&
 282                     load_flat_shared_library(id, p) > (unsigned long) -4096) {
 283             fprintf(stderr, "BINFMT_FLAT: failed to load library %d\n", id);
 284             goto failed;
 285         }
 286         /* Check versioning information (i.e. time stamps) */
 287         if (p[id].build_date && p[curid].build_date
 288             && p[curid].build_date < p[id].build_date) {
 289             fprintf(stderr, "BINFMT_FLAT: library %d is younger than %d\n",
 290                     id, curid);
 291             goto failed;
 292         }
 293     }
 294 #else
 295     id = 0;
 296 #endif
 297
 298     start_brk = p[id].start_brk;
 299     start_data = p[id].start_data;
 300     start_code = p[id].start_code;
 301     text_len = p[id].text_len;
 302
 303     if (!flat_reloc_valid(r, start_brk - start_data + text_len)) {
 304         fprintf(stderr, "BINFMT_FLAT: reloc outside program 0x%x "
 305                 "(0 - 0x%x/0x%x)\n",
 306                (int) r,(int)(start_brk-start_code),(int)text_len);
 307         goto failed;
 308     }
 309
 310     if (r < text_len)                   /* In text segment */
 311         addr = r + start_code;
 312     else                                        /* In data segment */
 313         addr = r - text_len + start_data;
 314
 315     /* Range checked already above so doing the range tests is redundant...*/
 316     return(addr);
 317
 318 failed:
 319     abort();
 320     return RELOC_FAILED;
 321 }
 322
 323 /****************************************************************************/
 324
 325 /* ??? This does not handle endianness correctly.  */
 326 static void old_reloc(struct lib_info *libinfo, uint32_t rl)
 327 {
 328 #ifdef DEBUG
 329         const char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" };
 330 #endif
 331         uint32_t *ptr;
 332         uint32_t offset;
 333         int reloc_type;
 334
 335         offset = rl & 0x3fffffff;
 336         reloc_type = rl >> 30;
 337         /* ??? How to handle this?  */
 338 #if defined(CONFIG_COLDFIRE)
 339         ptr = (uint32_t *) ((unsigned long) libinfo->start_code + offset);
 340 #else
 341         ptr = (uint32_t *) ((unsigned long) libinfo->start_data + offset);
 342 #endif
 343
 344 #ifdef DEBUG
 345         fprintf(stderr, "Relocation of variable at DATASEG+%x "
 346                 "(address %p, currently %x) into segment %s\n",
 347                 offset, ptr, (int)*ptr, segment[reloc_type]);
 348 #endif
 349
 350         switch (reloc_type) {
 351         case OLD_FLAT_RELOC_TYPE_TEXT:
 352                 *ptr += libinfo->start_code;
 353                 break;
 354         case OLD_FLAT_RELOC_TYPE_DATA:
 355                 *ptr += libinfo->start_data;
 356                 break;
 357         case OLD_FLAT_RELOC_TYPE_BSS:
 358                 *ptr += libinfo->end_data;
 359                 break;
 360         default:
 361                 fprintf(stderr, "BINFMT_FLAT: Unknown relocation type=%x\n",
 362                         reloc_type);
 363                 break;
 364         }
 365         DBG_FLT("Relocation became %x\n", (int)*ptr);
 366 }
 367
 368 /****************************************************************************/
 369
 370 static int load_flat_file(struct linux_binprm * bprm,
 371                 struct lib_info *libinfo, int id, abi_ulong *extra_stack)
 372 {
 373     struct flat_hdr * hdr;
 374     abi_ulong textpos = 0, datapos = 0;
 375     abi_long result;
 376     abi_ulong realdatastart = 0;
 377     abi_ulong text_len, data_len, bss_len, stack_len, flags;
 378     abi_ulong extra;
 379     abi_ulong reloc = 0, rp;
 380     int i, rev, relocs = 0;
 381     abi_ulong fpos;
 382     abi_ulong start_code;
 383     abi_ulong indx_len;
 384
 385     hdr = ((struct flat_hdr *) bprm->buf);              /* exec-header */
 386
 387     text_len  = ntohl(hdr->data_start);
 388     data_len  = ntohl(hdr->data_end) - ntohl(hdr->data_start);
 389     bss_len   = ntohl(hdr->bss_end) - ntohl(hdr->data_end);
 390     stack_len = ntohl(hdr->stack_size);
 391     if (extra_stack) {
 392         stack_len += *extra_stack;
 393         *extra_stack = stack_len;
 394     }
 395     relocs    = ntohl(hdr->reloc_count);
 396     flags     = ntohl(hdr->flags);
 397     rev       = ntohl(hdr->rev);
 398
 399     DBG_FLT("BINFMT_FLAT: Loading file: %s\n", bprm->filename);
 400
 401     if (rev != FLAT_VERSION && rev != OLD_FLAT_VERSION) {
 402         fprintf(stderr, "BINFMT_FLAT: bad magic/rev (0x%x, need 0x%x)\n",
 403                 rev, (int) FLAT_VERSION);
 404         return -ENOEXEC;
 405     }
 406
 407     /* Don't allow old format executables to use shared libraries */
 408     if (rev == OLD_FLAT_VERSION && id != 0) {
 409         fprintf(stderr, "BINFMT_FLAT: shared libraries are not available\n");
 410         return -ENOEXEC;
 411     }
 412
 413     /*
 414      * fix up the flags for the older format,  there were all kinds
 415      * of endian hacks,  this only works for the simple cases
 416      */
 417     if (rev == OLD_FLAT_VERSION && flat_old_ram_flag(flags))
 418         flags = FLAT_FLAG_RAM;
 419
 420 #ifndef CONFIG_BINFMT_ZFLAT
 421     if (flags & (FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA)) {
 422         fprintf(stderr, "Support for ZFLAT executables is not enabled\n");
 423         return -ENOEXEC;
 424     }
 425 #endif
 426
 427     /*
 428      * calculate the extra space we need to map in
 429      */
 430     extra = relocs * sizeof(abi_ulong);
 431     if (extra < bss_len + stack_len)
 432         extra = bss_len + stack_len;
 433
 434     /* Add space for library base pointers.  Make sure this does not
 435        misalign the  doesn't misalign the data segment.  */
 436     indx_len = MAX_SHARED_LIBS * sizeof(abi_ulong);
 437     indx_len = (indx_len + 15) & ~(abi_ulong)15;
 438
 439     /*
 440      * there are a couple of cases here,  the separate code/data
 441      * case,  and then the fully copied to RAM case which lumps
 442      * it all together.
 443      */
 444     if ((flags & (FLAT_FLAG_RAM|FLAT_FLAG_GZIP)) == 0) {
 445         /*
 446          * this should give us a ROM ptr,  but if it doesn't we don't
 447          * really care
 448          */
 449         DBG_FLT("BINFMT_FLAT: ROM mapping of file (we hope)\n");
 450
 451         textpos = target_mmap(0, text_len, PROT_READ|PROT_EXEC,
 452                               MAP_PRIVATE, bprm->fd, 0);
 453         if (textpos == -1) {
 454             fprintf(stderr, "Unable to mmap process text\n");
 455             return -1;
 456         }
 457
 458         realdatastart = target_mmap(0, data_len + extra + indx_len,
 459                                     PROT_READ|PROT_WRITE|PROT_EXEC,
 460                                     MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
 461
 462         if (realdatastart == -1) {
 463             fprintf(stderr, "Unable to allocate RAM for process data\n");
 464             return realdatastart;
 465         }
 466         datapos = realdatastart + indx_len;
 467
 468         DBG_FLT("BINFMT_FLAT: Allocated data+bss+stack (%d bytes): %x\n",
 469                         (int)(data_len + bss_len + stack_len), (int)datapos);
 470
 471         fpos = ntohl(hdr->data_start);
 472 #ifdef CONFIG_BINFMT_ZFLAT
 473         if (flags & FLAT_FLAG_GZDATA) {
 474             result = decompress_exec(bprm, fpos, (char *) datapos,
 475                                      data_len + (relocs * sizeof(abi_ulong)))
 476         } else
 477 #endif
 478         {
 479             result = target_pread(bprm->fd, datapos,
 480                                   data_len + (relocs * sizeof(abi_ulong)),
 481                                   fpos);
 482         }
 483         if (result < 0) {
 484             fprintf(stderr, "Unable to read data+bss\n");
 485             return result;
 486         }
 487
 488         reloc = datapos + (ntohl(hdr->reloc_start) - text_len);
 489
 490     } else {
 491
 492         textpos = target_mmap(0, text_len + data_len + extra + indx_len,
 493                               PROT_READ | PROT_EXEC | PROT_WRITE,
 494                               MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
 495         if (textpos == -1 ) {
 496             fprintf(stderr, "Unable to allocate RAM for process text/data\n");
 497             return -1;
 498         }
 499
 500         realdatastart = textpos + ntohl(hdr->data_start);
 501         datapos = realdatastart + indx_len;
 502         reloc = (textpos + ntohl(hdr->reloc_start) + indx_len);
 503
 504 #ifdef CONFIG_BINFMT_ZFLAT
 505 #error code needs checking
 506         /*
 507          * load it all in and treat it like a RAM load from now on
 508          */
 509         if (flags & FLAT_FLAG_GZIP) {
 510                 result = decompress_exec(bprm, sizeof (struct flat_hdr),
 511                                  (((char *) textpos) + sizeof (struct flat_hdr)),
 512                                  (text_len + data_len + (relocs * sizeof(unsigned long))
 513                                           - sizeof (struct flat_hdr)),
 514                                  0);
 515                 memmove((void *) datapos, (void *) realdatastart,
 516                                 data_len + (relocs * sizeof(unsigned long)));
 517         } else if (flags & FLAT_FLAG_GZDATA) {
 518                 fpos = 0;
 519                 result = bprm->file->f_op->read(bprm->file,
 520                                 (char *) textpos, text_len, &fpos);
 521                 if (result < (unsigned long) -4096)
 522                         result = decompress_exec(bprm, text_len, (char *) datapos,
 523                                          data_len + (relocs * sizeof(unsigned long)), 0);
 524         }
 525         else
 526 #endif
 527         {
 528             result = target_pread(bprm->fd, textpos,
 529                                   text_len, 0);
 530             if (result >= 0) {
 531                 result = target_pread(bprm->fd, datapos,
 532                     data_len + (relocs * sizeof(abi_ulong)),
 533                     ntohl(hdr->data_start));
 534             }
 535         }
 536         if (result < 0) {
 537             fprintf(stderr, "Unable to read code+data+bss\n");
 538             return result;
 539         }
 540     }
 541
 542     DBG_FLT("Mapping is 0x%x, Entry point is 0x%x, data_start is 0x%x\n",
 543             (int)textpos, 0x00ffffff&ntohl(hdr->entry),
 544             ntohl(hdr->data_start));
 545
 546     /* The main program needs a little extra setup in the task structure */
 547     start_code = textpos + sizeof (struct flat_hdr);
 548
 549     DBG_FLT("%s %s: TEXT=%x-%x DATA=%x-%x BSS=%x-%x\n",
 550             id ? "Lib" : "Load", bprm->filename,
 551             (int) start_code, (int) (textpos + text_len),
 552             (int) datapos,
 553             (int) (datapos + data_len),
 554             (int) (datapos + data_len),
 555             (int) (((datapos + data_len + bss_len) + 3) & ~3));
 556
 557     text_len -= sizeof(struct flat_hdr); /* the real code len */
 558
 559     /* Store the current module values into the global library structure */
 560     libinfo[id].start_code = start_code;
 561     libinfo[id].start_data = datapos;
 562     libinfo[id].end_data = datapos + data_len;
 563     libinfo[id].start_brk = datapos + data_len + bss_len;
 564     libinfo[id].text_len = text_len;
 565     libinfo[id].loaded = 1;
 566     libinfo[id].entry = (0x00ffffff & ntohl(hdr->entry)) + textpos;
 567     libinfo[id].build_date = ntohl(hdr->build_date);
 568
 569     /*
 570      * We just load the allocations into some temporary memory to
 571      * help simplify all this mumbo jumbo
 572      *
 573      * We've got two different sections of relocation entries.
 574      * The first is the GOT which resides at the beginning of the data segment
 575      * and is terminated with a -1.  This one can be relocated in place.
 576      * The second is the extra relocation entries tacked after the image's
 577      * data segment. These require a little more processing as the entry is
 578      * really an offset into the image which contains an offset into the
 579      * image.
 580      */
 581     if (flags & FLAT_FLAG_GOTPIC) {
 582         rp = datapos;
 583         while (1) {
 584             abi_ulong addr;
 585             if (get_user_ual(addr, rp))
 586                 return -EFAULT;
 587             if (addr == -1)
 588                 break;
 589             if (addr) {
 590                 addr = calc_reloc(addr, libinfo, id, 0);
 591                 if (addr == RELOC_FAILED)
 592                     return -ENOEXEC;
 593                 if (put_user_ual(addr, rp))
 594                     return -EFAULT;
 595             }
 596             rp += sizeof(abi_ulong);
 597         }
 598     }
 599
 600     /*
 601      * Now run through the relocation entries.
 602      * We've got to be careful here as C++ produces relocatable zero
 603      * entries in the constructor and destructor tables which are then
 604      * tested for being not zero (which will always occur unless we're
 605      * based from address zero).  This causes an endless loop as __start
 606      * is at zero.  The solution used is to not relocate zero addresses.
 607      * This has the negative side effect of not allowing a global data
 608      * reference to be statically initialised to _stext (I've moved
 609      * __start to address 4 so that is okay).
 610      */
 611     if (rev > OLD_FLAT_VERSION) {
 612         abi_ulong persistent = 0;
 613         for (i = 0; i < relocs; i++) {
 614             abi_ulong addr, relval;
 615
 616             /* Get the address of the pointer to be
 617                relocated (of course, the address has to be
 618                relocated first).  */
 619             if (get_user_ual(relval, reloc + i * sizeof(abi_ulong)))
 620                 return -EFAULT;
 621             relval = ntohl(relval);
 622             if (flat_set_persistent(relval, &persistent))
 623                 continue;
 624             addr = flat_get_relocate_addr(relval);
 625             rp = calc_reloc(addr, libinfo, id, 1);
 626             if (rp == RELOC_FAILED)
 627                 return -ENOEXEC;
 628
 629             /* Get the pointer's value.  */
 630             if (get_user_ual(addr, rp))
 631                 return -EFAULT;
 632             addr = flat_get_addr_from_rp(addr, relval, flags, &persistent);
 633             if (addr != 0) {
 634                 /*
 635                  * Do the relocation.  PIC relocs in the data section are
 636                  * already in target order
 637                  */
 638                 if ((flags & FLAT_FLAG_GOTPIC) == 0)
 639                     addr = ntohl(addr);
 640                 addr = calc_reloc(addr, libinfo, id, 0);
 641                 if (addr == RELOC_FAILED)
 642                     return -ENOEXEC;
 643
 644                 /* Write back the relocated pointer.  */
 645                 if (flat_put_addr_at_rp(rp, addr, relval))
 646                     return -EFAULT;
 647             }
 648         }
 649     } else {
 650         for (i = 0; i < relocs; i++) {
 651             abi_ulong relval;
 652             if (get_user_ual(relval, reloc + i * sizeof(abi_ulong)))
 653                 return -EFAULT;
 654             old_reloc(&libinfo[0], relval);
 655         }
 656     }
 657
 658     /* zero the BSS.  */
 659     memset(g2h(datapos + data_len), 0, bss_len);
 660
 661     return 0;
 662 }
 663
 664
 665 /****************************************************************************/
 666 #ifdef CONFIG_BINFMT_SHARED_FLAT
 667
 668 /*
 669  * Load a shared library into memory.  The library gets its own data
 670  * segment (including bss) but not argv/argc/environ.
 671  */
 672
 673 static int load_flat_shared_library(int id, struct lib_info *libs)
 674 {
 675         struct linux_binprm bprm;
 676         int res;
 677         char buf[16];
 678
 679         /* Create the file name */
 680         sprintf(buf, "/lib/lib%d.so", id);
 681
 682         /* Open the file up */
 683         bprm.filename = buf;
 684         bprm.file = open_exec(bprm.filename);
 685         res = PTR_ERR(bprm.file);
 686         if (IS_ERR(bprm.file))
 687                 return res;
 688
 689         res = prepare_binprm(&bprm);
 690
 691         if (res <= (unsigned long)-4096)
 692                 res = load_flat_file(&bprm, libs, id, NULL);
 693         if (bprm.file) {
 694                 allow_write_access(bprm.file);
 695                 fput(bprm.file);
 696                 bprm.file = NULL;
 697         }
 698         return(res);
 699 }
 700
 701 #endif /* CONFIG_BINFMT_SHARED_FLAT */
 702
 703 int load_flt_binary(struct linux_binprm *bprm, struct image_info *info)
 704 {
 705     struct lib_info libinfo[MAX_SHARED_LIBS];
 706     abi_ulong p;
 707     abi_ulong stack_len;
 708     abi_ulong start_addr;
 709     abi_ulong sp;
 710     int res;
 711     int i, j;
 712
 713     memset(libinfo, 0, sizeof(libinfo));
 714     /*
 715      * We have to add the size of our arguments to our stack size
 716      * otherwise it's too easy for users to create stack overflows
 717      * by passing in a huge argument list.  And yes,  we have to be
 718      * pedantic and include space for the argv/envp array as it may have
 719      * a lot of entries.
 720      */
 721     stack_len = 0;
 722     for (i = 0; i < bprm->argc; ++i) {
 723         /* the argv strings */
 724         stack_len += strlen(bprm->argv[i]);
 725     }
 726     for (i = 0; i < bprm->envc; ++i) {
 727         /* the envp strings */
 728         stack_len += strlen(bprm->envp[i]);
 729     }
 730     stack_len += (bprm->argc + 1) * 4; /* the argv array */
 731     stack_len += (bprm->envc + 1) * 4; /* the envp array */
 732
 733
 734     res = load_flat_file(bprm, libinfo, 0, &stack_len);
 735     if (res > (unsigned long)-4096)
 736             return res;
 737
 738     /* Update data segment pointers for all libraries */
 739     for (i=0; i<MAX_SHARED_LIBS; i++) {
 740         if (libinfo[i].loaded) {
 741             abi_ulong p;
 742             p = libinfo[i].start_data;
 743             for (j=0; j<MAX_SHARED_LIBS; j++) {
 744                 p -= 4;
 745                 /* FIXME - handle put_user() failures */
 746                 if (put_user_ual(libinfo[j].loaded
 747                                  ? libinfo[j].start_data
 748                                  : UNLOADED_LIB,
 749                                  p))
 750                     return -EFAULT;
 751             }
 752         }
 753     }
 754
 755     p = ((libinfo[0].start_brk + stack_len + 3) & ~3) - 4;
 756     DBG_FLT("p=%x\n", (int)p);
 757
 758     /* Copy argv/envp.  */
 759     p = copy_strings(p, bprm->envc, bprm->envp);
 760     p = copy_strings(p, bprm->argc, bprm->argv);
 761     /* Align stack.  */
 762     sp = p & ~(abi_ulong)(sizeof(abi_ulong) - 1);
 763     /* Enforce final stack alignment of 16 bytes.  This is sufficient
 764        for all current targets, and excess alignment is harmless.  */
 765     stack_len = bprm->envc + bprm->argc + 2;
 766     stack_len += 3;     /* argc, arvg, argp */
 767     stack_len *= sizeof(abi_ulong);
 768     if ((sp + stack_len) & 15)
 769         sp -= 16 - ((sp + stack_len) & 15);
 770     sp = loader_build_argptr(bprm->envc, bprm->argc, sp, p,
 771                              flat_argvp_envp_on_stack());
 772
 773     /* Fake some return addresses to ensure the call chain will
 774      * initialise library in order for us.  We are required to call
 775      * lib 1 first, then 2, ... and finally the main program (id 0).
 776      */
 777     start_addr = libinfo[0].entry;
 778
 779 #ifdef CONFIG_BINFMT_SHARED_FLAT
 780 #error here
 781     for (i = MAX_SHARED_LIBS-1; i>0; i--) {
 782             if (libinfo[i].loaded) {
 783                     /* Push previos first to call address */
 784                     --sp;
 785                     if (put_user_ual(start_addr, sp))
 786                         return -EFAULT;
 787                     start_addr = libinfo[i].entry;
 788             }
 789     }
 790 #endif
 791
 792     /* Stash our initial stack pointer into the mm structure */
 793     info->start_code = libinfo[0].start_code;
 794     info->end_code = libinfo[0].start_code = libinfo[0].text_len;
 795     info->start_data = libinfo[0].start_data;
 796     info->end_data = libinfo[0].end_data;
 797     info->start_brk = libinfo[0].start_brk;
 798     info->start_stack = sp;
 799     info->stack_limit = libinfo[0].start_brk;
 800     info->entry = start_addr;
 801     info->code_offset = info->start_code;
 802     info->data_offset = info->start_data - libinfo[0].text_len;
 803
 804     DBG_FLT("start_thread(entry=0x%x, start_stack=0x%x)\n",
 805             (int)info->entry, (int)info->start_stack);
 806
 807     return 0;
 808 }