qemu

flatload.c (26206B)

---

 /****************************************************************************/
 /*
  *  QEMU bFLT binary loader.  Based on linux/fs/binfmt_flat.c
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
  *  the Free Software Foundation; either version 2 of the License, or
  *  (at your option) any later version.
  *
  *  This program is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *  GNU General Public License for more details.
  *
  *  You should have received a copy of the GNU General Public License
  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  *
  *      Copyright (C) 2006 CodeSourcery.
  *	Copyright (C) 2000-2003 David McCullough <davidm@snapgear.com>
  *	Copyright (C) 2002 Greg Ungerer <gerg@snapgear.com>
  *	Copyright (C) 2002 SnapGear, by Paul Dale <pauli@snapgear.com>
  *	Copyright (C) 2000, 2001 Lineo, by David McCullough <davidm@lineo.com>
  *  based heavily on:
  *
  *  linux/fs/binfmt_aout.c:
  *      Copyright (C) 1991, 1992, 1996  Linus Torvalds
  *  linux/fs/binfmt_flat.c for 2.0 kernel
  *	    Copyright (C) 1998  Kenneth Albanowski <kjahds@kjahds.com>
  *	JAN/99 -- coded full program relocation (gerg@snapgear.com)
  */
 
 /* ??? ZFLAT and shared library support is currently disabled.  */
 
 /****************************************************************************/
 
 #include "qemu/osdep.h"
 
 #include "qemu.h"
 #include "user-internals.h"
 #include "loader.h"
 #include "user-mmap.h"
 #include "flat.h"
 #include "target_flat.h"
 
 //#define DEBUG
 
 #ifdef DEBUG
 #define	DBG_FLT(...)	printf(__VA_ARGS__)
 #else
 #define	DBG_FLT(...)
 #endif
 
 #define RELOC_FAILED 0xff00ff01		/* Relocation incorrect somewhere */
 #define UNLOADED_LIB 0x7ff000ff		/* Placeholder for unused library */
 
 struct lib_info {
     abi_ulong start_code;       /* Start of text segment */
     abi_ulong start_data;       /* Start of data segment */
     abi_ulong end_data;         /* Start of bss section */
     abi_ulong start_brk;        /* End of data segment */
     abi_ulong text_len;	        /* Length of text segment */
     abi_ulong entry;	        /* Start address for this module */
     abi_ulong build_date;       /* When this one was compiled */
     short loaded;		/* Has this library been loaded? */
 };
 
 #ifdef CONFIG_BINFMT_SHARED_FLAT
 static int load_flat_shared_library(int id, struct lib_info *p);
 #endif
 
 struct linux_binprm;
 
 /****************************************************************************/
 /*
  * create_flat_tables() parses the env- and arg-strings in new user
  * memory and creates the pointer tables from them, and puts their
  * addresses on the "stack", returning the new stack pointer value.
  */
 
 /* Push a block of strings onto the guest stack.  */
 static abi_ulong copy_strings(abi_ulong p, int n, char **s)
 {
     int len;
 
     while (n-- > 0) {
         len = strlen(s[n]) + 1;
         p -= len;
         memcpy_to_target(p, s[n], len);
     }
 
     return p;
 }
 
 static int target_pread(int fd, abi_ulong ptr, abi_ulong len,
                         abi_ulong offset)
 {
     void *buf;
     int ret;
 
     buf = lock_user(VERIFY_WRITE, ptr, len, 0);
     if (!buf) {
         return -EFAULT;
     }
     ret = pread(fd, buf, len, offset);
     if (ret < 0) {
         ret = -errno;
     }
     unlock_user(buf, ptr, len);
     return ret;
 }
 /****************************************************************************/
 
 #ifdef CONFIG_BINFMT_ZFLAT
 
 #include <linux/zlib.h>
 
 #define LBUFSIZE	4000
 
 /* gzip flag byte */
 #define ASCII_FLAG   0x01 /* bit 0 set: file probably ASCII text */
 #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
 #define EXTRA_FIELD  0x04 /* bit 2 set: extra field present */
 #define ORIG_NAME    0x08 /* bit 3 set: original file name present */
 #define COMMENT      0x10 /* bit 4 set: file comment present */
 #define ENCRYPTED    0x20 /* bit 5 set: file is encrypted */
 #define RESERVED     0xC0 /* bit 6,7:   reserved */
 
 static int decompress_exec(
 	struct linux_binprm *bprm,
 	unsigned long offset,
 	char *dst,
 	long len,
 	int fd)
 {
 	unsigned char *buf;
 	z_stream strm;
 	loff_t fpos;
 	int ret, retval;
 
 	DBG_FLT("decompress_exec(offset=%x,buf=%x,len=%x)\n",(int)offset, (int)dst, (int)len);
 
 	memset(&strm, 0, sizeof(strm));
 	strm.workspace = kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL);
 	if (strm.workspace == NULL) {
 		DBG_FLT("binfmt_flat: no memory for decompress workspace\n");
 		return -ENOMEM;
 	}
 	buf = kmalloc(LBUFSIZE, GFP_KERNEL);
 	if (buf == NULL) {
 		DBG_FLT("binfmt_flat: no memory for read buffer\n");
 		retval = -ENOMEM;
 		goto out_free;
 	}
 
 	/* Read in first chunk of data and parse gzip header. */
 	fpos = offset;
 	ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos);
 
 	strm.next_in = buf;
 	strm.avail_in = ret;
 	strm.total_in = 0;
 
 	retval = -ENOEXEC;
 
 	/* Check minimum size -- gzip header */
 	if (ret < 10) {
 		DBG_FLT("binfmt_flat: file too small?\n");
 		goto out_free_buf;
 	}
 
 	/* Check gzip magic number */
 	if ((buf[0] != 037) || ((buf[1] != 0213) && (buf[1] != 0236))) {
 		DBG_FLT("binfmt_flat: unknown compression magic?\n");
 		goto out_free_buf;
 	}
 
 	/* Check gzip method */
 	if (buf[2] != 8) {
 		DBG_FLT("binfmt_flat: unknown compression method?\n");
 		goto out_free_buf;
 	}
 	/* Check gzip flags */
 	if ((buf[3] & ENCRYPTED) || (buf[3] & CONTINUATION) ||
 	    (buf[3] & RESERVED)) {
 		DBG_FLT("binfmt_flat: unknown flags?\n");
 		goto out_free_buf;
 	}
 
 	ret = 10;
 	if (buf[3] & EXTRA_FIELD) {
 		ret += 2 + buf[10] + (buf[11] << 8);
 		if (unlikely(LBUFSIZE == ret)) {
 			DBG_FLT("binfmt_flat: buffer overflow (EXTRA)?\n");
 			goto out_free_buf;
 		}
 	}
 	if (buf[3] & ORIG_NAME) {
 		for (; ret < LBUFSIZE && (buf[ret] != 0); ret++)
 			;
 		if (unlikely(LBUFSIZE == ret)) {
 			DBG_FLT("binfmt_flat: buffer overflow (ORIG_NAME)?\n");
 			goto out_free_buf;
 		}
 	}
 	if (buf[3] & COMMENT) {
 		for (;  ret < LBUFSIZE && (buf[ret] != 0); ret++)
 			;
 		if (unlikely(LBUFSIZE == ret)) {
 			DBG_FLT("binfmt_flat: buffer overflow (COMMENT)?\n");
 			goto out_free_buf;
 		}
 	}
 
 	strm.next_in += ret;
 	strm.avail_in -= ret;
 
 	strm.next_out = dst;
 	strm.avail_out = len;
 	strm.total_out = 0;
 
 	if (zlib_inflateInit2(&strm, -MAX_WBITS) != Z_OK) {
 		DBG_FLT("binfmt_flat: zlib init failed?\n");
 		goto out_free_buf;
 	}
 
 	while ((ret = zlib_inflate(&strm, Z_NO_FLUSH)) == Z_OK) {
 		ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos);
 		if (ret <= 0)
 			break;
                 if (is_error(ret)) {
 			break;
                 }
 		len -= ret;
 
 		strm.next_in = buf;
 		strm.avail_in = ret;
 		strm.total_in = 0;
 	}
 
 	if (ret < 0) {
 		DBG_FLT("binfmt_flat: decompression failed (%d), %s\n",
 			ret, strm.msg);
 		goto out_zlib;
 	}
 
 	retval = 0;
 out_zlib:
 	zlib_inflateEnd(&strm);
 out_free_buf:
 	kfree(buf);
 out_free:
 	kfree(strm.workspace);
 out:
 	return retval;
 }
 
 #endif /* CONFIG_BINFMT_ZFLAT */
 
 /****************************************************************************/
 
 static abi_ulong
 calc_reloc(abi_ulong r, struct lib_info *p, int curid, int internalp)
 {
     abi_ulong addr;
     int id;
     abi_ulong start_brk;
     abi_ulong start_data;
     abi_ulong text_len;
     abi_ulong start_code;
 
 #ifdef CONFIG_BINFMT_SHARED_FLAT
 #error needs checking
     if (r == 0)
         id = curid;	/* Relocs of 0 are always self referring */
     else {
         id = (r >> 24) & 0xff;	/* Find ID for this reloc */
         r &= 0x00ffffff;	/* Trim ID off here */
     }
     if (id >= MAX_SHARED_LIBS) {
         fprintf(stderr, "BINFMT_FLAT: reference 0x%x to shared library %d\n",
                 (unsigned) r, id);
         goto failed;
     }
     if (curid != id) {
         if (internalp) {
             fprintf(stderr, "BINFMT_FLAT: reloc address 0x%x not "
                     "in same module (%d != %d)\n",
                     (unsigned) r, curid, id);
             goto failed;
         } else if (!p[id].loaded && is_error(load_flat_shared_library(id, p))) {
             fprintf(stderr, "BINFMT_FLAT: failed to load library %d\n", id);
             goto failed;
         }
         /* Check versioning information (i.e. time stamps) */
         if (p[id].build_date && p[curid].build_date
             && p[curid].build_date < p[id].build_date) {
             fprintf(stderr, "BINFMT_FLAT: library %d is younger than %d\n",
                     id, curid);
             goto failed;
         }
     }
 #else
     id = 0;
 #endif
 
     start_brk = p[id].start_brk;
     start_data = p[id].start_data;
     start_code = p[id].start_code;
     text_len = p[id].text_len;
 
     if (!flat_reloc_valid(r, start_brk - start_data + text_len)) {
         fprintf(stderr, "BINFMT_FLAT: reloc outside program 0x%x "
                 "(0 - 0x%x/0x%x)\n",
                (int) r,(int)(start_brk-start_code),(int)text_len);
         goto failed;
     }
 
     if (r < text_len)			/* In text segment */
         addr = r + start_code;
     else					/* In data segment */
         addr = r - text_len + start_data;
 
     /* Range checked already above so doing the range tests is redundant...*/
     return(addr);
 
 failed:
     abort();
     return RELOC_FAILED;
 }
 
 /****************************************************************************/
 
 /* ??? This does not handle endianness correctly.  */
 static void old_reloc(struct lib_info *libinfo, uint32_t rl)
 {
 #ifdef DEBUG
 	const char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" };
 #endif
 	uint32_t *ptr;
         uint32_t offset;
         int reloc_type;
 
         offset = rl & 0x3fffffff;
         reloc_type = rl >> 30;
         /* ??? How to handle this?  */
 #if defined(CONFIG_COLDFIRE)
 	ptr = (uint32_t *) ((unsigned long) libinfo->start_code + offset);
 #else
 	ptr = (uint32_t *) ((unsigned long) libinfo->start_data + offset);
 #endif
 
 #ifdef DEBUG
 	fprintf(stderr, "Relocation of variable at DATASEG+%x "
 		"(address %p, currently %x) into segment %s\n",
 		offset, ptr, (int)*ptr, segment[reloc_type]);
 #endif
 
 	switch (reloc_type) {
 	case OLD_FLAT_RELOC_TYPE_TEXT:
 		*ptr += libinfo->start_code;
 		break;
 	case OLD_FLAT_RELOC_TYPE_DATA:
 		*ptr += libinfo->start_data;
 		break;
 	case OLD_FLAT_RELOC_TYPE_BSS:
 		*ptr += libinfo->end_data;
 		break;
 	default:
 		fprintf(stderr, "BINFMT_FLAT: Unknown relocation type=%x\n",
                         reloc_type);
 		break;
 	}
 	DBG_FLT("Relocation became %x\n", (int)*ptr);
 }
 
 /****************************************************************************/
 
 static int load_flat_file(struct linux_binprm * bprm,
 		struct lib_info *libinfo, int id, abi_ulong *extra_stack)
 {
     struct flat_hdr * hdr;
     abi_ulong textpos = 0, datapos = 0;
     abi_long result;
     abi_ulong realdatastart = 0;
     abi_ulong text_len, data_len, bss_len, stack_len, flags;
     abi_ulong extra;
     abi_ulong reloc = 0, rp;
     int i, rev, relocs = 0;
     abi_ulong fpos;
     abi_ulong start_code;
     abi_ulong indx_len;
 
     hdr = ((struct flat_hdr *) bprm->buf);		/* exec-header */
 
     text_len  = ntohl(hdr->data_start);
     data_len  = ntohl(hdr->data_end) - ntohl(hdr->data_start);
     bss_len   = ntohl(hdr->bss_end) - ntohl(hdr->data_end);
     stack_len = ntohl(hdr->stack_size);
     if (extra_stack) {
         stack_len += *extra_stack;
         *extra_stack = stack_len;
     }
     relocs    = ntohl(hdr->reloc_count);
     flags     = ntohl(hdr->flags);
     rev       = ntohl(hdr->rev);
 
     DBG_FLT("BINFMT_FLAT: Loading file: %s\n", bprm->filename);
 
     if (rev != FLAT_VERSION && rev != OLD_FLAT_VERSION) {
         fprintf(stderr, "BINFMT_FLAT: bad magic/rev (0x%x, need 0x%x)\n",
                 rev, (int) FLAT_VERSION);
         return -ENOEXEC;
     }
 
     /* Don't allow old format executables to use shared libraries */
     if (rev == OLD_FLAT_VERSION && id != 0) {
         fprintf(stderr, "BINFMT_FLAT: shared libraries are not available\n");
         return -ENOEXEC;
     }
 
     /*
      * fix up the flags for the older format,  there were all kinds
      * of endian hacks,  this only works for the simple cases
      */
     if (rev == OLD_FLAT_VERSION && flat_old_ram_flag(flags))
         flags = FLAT_FLAG_RAM;
 
 #ifndef CONFIG_BINFMT_ZFLAT
     if (flags & (FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA)) {
         fprintf(stderr, "Support for ZFLAT executables is not enabled\n");
         return -ENOEXEC;
     }
 #endif
 
     /*
      * calculate the extra space we need to map in
      */
     extra = relocs * sizeof(abi_ulong);
     if (extra < bss_len + stack_len)
         extra = bss_len + stack_len;
 
     /* Add space for library base pointers.  Make sure this does not
        misalign the  doesn't misalign the data segment.  */
     indx_len = MAX_SHARED_LIBS * sizeof(abi_ulong);
     indx_len = (indx_len + 15) & ~(abi_ulong)15;
 
     /*
      * Allocate the address space.
      */
     probe_guest_base(bprm->filename, 0,
                      text_len + data_len + extra + indx_len);
 
     /*
      * there are a couple of cases here,  the separate code/data
      * case,  and then the fully copied to RAM case which lumps
      * it all together.
      */
     if ((flags & (FLAT_FLAG_RAM|FLAT_FLAG_GZIP)) == 0) {
         /*
          * this should give us a ROM ptr,  but if it doesn't we don't
          * really care
          */
         DBG_FLT("BINFMT_FLAT: ROM mapping of file (we hope)\n");
 
         textpos = target_mmap(0, text_len, PROT_READ|PROT_EXEC,
                               MAP_PRIVATE, bprm->fd, 0);
         if (textpos == -1) {
             fprintf(stderr, "Unable to mmap process text\n");
             return -1;
         }
 
         realdatastart = target_mmap(0, data_len + extra + indx_len,
                                     PROT_READ|PROT_WRITE|PROT_EXEC,
                                     MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
 
         if (realdatastart == -1) {
             fprintf(stderr, "Unable to allocate RAM for process data\n");
             return realdatastart;
         }
         datapos = realdatastart + indx_len;
 
         DBG_FLT("BINFMT_FLAT: Allocated data+bss+stack (%d bytes): %x\n",
                         (int)(data_len + bss_len + stack_len), (int)datapos);
 
         fpos = ntohl(hdr->data_start);
 #ifdef CONFIG_BINFMT_ZFLAT
         if (flags & FLAT_FLAG_GZDATA) {
             result = decompress_exec(bprm, fpos, (char *) datapos,
                                      data_len + (relocs * sizeof(abi_ulong)))
         } else
 #endif
         {
             result = target_pread(bprm->fd, datapos,
                                   data_len + (relocs * sizeof(abi_ulong)),
                                   fpos);
         }
         if (result < 0) {
             fprintf(stderr, "Unable to read data+bss\n");
             return result;
         }
 
         reloc = datapos + (ntohl(hdr->reloc_start) - text_len);
 
     } else {
 
         textpos = target_mmap(0, text_len + data_len + extra + indx_len,
                               PROT_READ | PROT_EXEC | PROT_WRITE,
                               MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
         if (textpos == -1 ) {
             fprintf(stderr, "Unable to allocate RAM for process text/data\n");
             return -1;
         }
 
         realdatastart = textpos + ntohl(hdr->data_start);
         datapos = realdatastart + indx_len;
         reloc = (textpos + ntohl(hdr->reloc_start) + indx_len);
 
 #ifdef CONFIG_BINFMT_ZFLAT
 #error code needs checking
         /*
          * load it all in and treat it like a RAM load from now on
          */
         if (flags & FLAT_FLAG_GZIP) {
                 result = decompress_exec(bprm, sizeof (struct flat_hdr),
                                  (((char *) textpos) + sizeof (struct flat_hdr)),
                                  (text_len + data_len + (relocs * sizeof(unsigned long))
                                           - sizeof (struct flat_hdr)),
                                  0);
                 memmove((void *) datapos, (void *) realdatastart,
                                 data_len + (relocs * sizeof(unsigned long)));
         } else if (flags & FLAT_FLAG_GZDATA) {
                 fpos = 0;
                 result = bprm->file->f_op->read(bprm->file,
                                 (char *) textpos, text_len, &fpos);
                 if (!is_error(result)) {
                         result = decompress_exec(bprm, text_len, (char *) datapos,
                                          data_len + (relocs * sizeof(unsigned long)), 0);
                 }
         }
         else
 #endif
         {
             result = target_pread(bprm->fd, textpos,
                                   text_len, 0);
             if (result >= 0) {
                 result = target_pread(bprm->fd, datapos,
                     data_len + (relocs * sizeof(abi_ulong)),
                     ntohl(hdr->data_start));
             }
         }
         if (result < 0) {
             fprintf(stderr, "Unable to read code+data+bss\n");
             return result;
         }
     }
 
     DBG_FLT("Mapping is 0x%x, Entry point is 0x%x, data_start is 0x%x\n",
             (int)textpos, 0x00ffffff&ntohl(hdr->entry),
             ntohl(hdr->data_start));
 
     /* The main program needs a little extra setup in the task structure */
     start_code = textpos + sizeof (struct flat_hdr);
 
     DBG_FLT("%s %s: TEXT=%x-%x DATA=%x-%x BSS=%x-%x\n",
             id ? "Lib" : "Load", bprm->filename,
             (int) start_code, (int) (textpos + text_len),
             (int) datapos,
             (int) (datapos + data_len),
             (int) (datapos + data_len),
             (int) (((datapos + data_len + bss_len) + 3) & ~3));
 
     text_len -= sizeof(struct flat_hdr); /* the real code len */
 
     /* Store the current module values into the global library structure */
     libinfo[id].start_code = start_code;
     libinfo[id].start_data = datapos;
     libinfo[id].end_data = datapos + data_len;
     libinfo[id].start_brk = datapos + data_len + bss_len;
     libinfo[id].text_len = text_len;
     libinfo[id].loaded = 1;
     libinfo[id].entry = (0x00ffffff & ntohl(hdr->entry)) + textpos;
     libinfo[id].build_date = ntohl(hdr->build_date);
 
     /*
      * We just load the allocations into some temporary memory to
      * help simplify all this mumbo jumbo
      *
      * We've got two different sections of relocation entries.
      * The first is the GOT which resides at the beginning of the data segment
      * and is terminated with a -1.  This one can be relocated in place.
      * The second is the extra relocation entries tacked after the image's
      * data segment. These require a little more processing as the entry is
      * really an offset into the image which contains an offset into the
      * image.
      */
     if (flags & FLAT_FLAG_GOTPIC) {
         rp = datapos;
         while (1) {
             abi_ulong addr;
             if (get_user_ual(addr, rp))
                 return -EFAULT;
             if (addr == -1)
                 break;
             if (addr) {
                 addr = calc_reloc(addr, libinfo, id, 0);
                 if (addr == RELOC_FAILED)
                     return -ENOEXEC;
                 if (put_user_ual(addr, rp))
                     return -EFAULT;
             }
             rp += sizeof(abi_ulong);
         }
     }
 
     /*
      * Now run through the relocation entries.
      * We've got to be careful here as C++ produces relocatable zero
      * entries in the constructor and destructor tables which are then
      * tested for being not zero (which will always occur unless we're
      * based from address zero).  This causes an endless loop as __start
      * is at zero.  The solution used is to not relocate zero addresses.
      * This has the negative side effect of not allowing a global data
      * reference to be statically initialised to _stext (I've moved
      * __start to address 4 so that is okay).
      */
     if (rev > OLD_FLAT_VERSION) {
         abi_ulong persistent = 0;
         for (i = 0; i < relocs; i++) {
             abi_ulong addr, relval;
 
             /* Get the address of the pointer to be
                relocated (of course, the address has to be
                relocated first).  */
             if (get_user_ual(relval, reloc + i * sizeof(abi_ulong)))
                 return -EFAULT;
             relval = ntohl(relval);
             if (flat_set_persistent(relval, &persistent))
                 continue;
             addr = flat_get_relocate_addr(relval);
             rp = calc_reloc(addr, libinfo, id, 1);
             if (rp == RELOC_FAILED)
                 return -ENOEXEC;
 
             /* Get the pointer's value.  */
             if (get_user_ual(addr, rp))
                 return -EFAULT;
             addr = flat_get_addr_from_rp(addr, relval, flags, &persistent);
             if (addr != 0) {
                 /*
                  * Do the relocation.  PIC relocs in the data section are
                  * already in target order
                  */
                 if ((flags & FLAT_FLAG_GOTPIC) == 0)
                     addr = ntohl(addr);
                 addr = calc_reloc(addr, libinfo, id, 0);
                 if (addr == RELOC_FAILED)
                     return -ENOEXEC;
 
                 /* Write back the relocated pointer.  */
                 if (flat_put_addr_at_rp(rp, addr, relval))
                     return -EFAULT;
             }
         }
     } else {
         for (i = 0; i < relocs; i++) {
             abi_ulong relval;
             if (get_user_ual(relval, reloc + i * sizeof(abi_ulong)))
                 return -EFAULT;
             old_reloc(&libinfo[0], relval);
         }
     }
 
     /* zero the BSS.  */
     memset(g2h_untagged(datapos + data_len), 0, bss_len);
 
     return 0;
 }
 
 
 /****************************************************************************/
 #ifdef CONFIG_BINFMT_SHARED_FLAT
 
 /*
  * Load a shared library into memory.  The library gets its own data
  * segment (including bss) but not argv/argc/environ.
  */
 
 static int load_flat_shared_library(int id, struct lib_info *libs)
 {
 	struct linux_binprm bprm;
 	int res;
 	char buf[16];
 
 	/* Create the file name */
 	sprintf(buf, "/lib/lib%d.so", id);
 
 	/* Open the file up */
 	bprm.filename = buf;
 	bprm.file = open_exec(bprm.filename);
 	res = PTR_ERR(bprm.file);
 	if (IS_ERR(bprm.file))
 		return res;
 
 	res = prepare_binprm(&bprm);
 
         if (!is_error(res)) {
 		res = load_flat_file(&bprm, libs, id, NULL);
         }
 	if (bprm.file) {
 		allow_write_access(bprm.file);
 		fput(bprm.file);
 		bprm.file = NULL;
 	}
 	return(res);
 }
 
 #endif /* CONFIG_BINFMT_SHARED_FLAT */
 
 int load_flt_binary(struct linux_binprm *bprm, struct image_info *info)
 {
     struct lib_info libinfo[MAX_SHARED_LIBS];
     abi_ulong p;
     abi_ulong stack_len;
     abi_ulong start_addr;
     abi_ulong sp;
     int res;
     int i, j;
 
     memset(libinfo, 0, sizeof(libinfo));
     /*
      * We have to add the size of our arguments to our stack size
      * otherwise it's too easy for users to create stack overflows
      * by passing in a huge argument list.  And yes,  we have to be
      * pedantic and include space for the argv/envp array as it may have
      * a lot of entries.
      */
     stack_len = 0;
     for (i = 0; i < bprm->argc; ++i) {
         /* the argv strings */
         stack_len += strlen(bprm->argv[i]);
     }
     for (i = 0; i < bprm->envc; ++i) {
         /* the envp strings */
         stack_len += strlen(bprm->envp[i]);
     }
     stack_len += (bprm->argc + 1) * 4; /* the argv array */
     stack_len += (bprm->envc + 1) * 4; /* the envp array */
 
 
     res = load_flat_file(bprm, libinfo, 0, &stack_len);
     if (is_error(res)) {
             return res;
     }
 
     /* Update data segment pointers for all libraries */
     for (i=0; i<MAX_SHARED_LIBS; i++) {
         if (libinfo[i].loaded) {
             abi_ulong p;
             p = libinfo[i].start_data;
             for (j=0; j<MAX_SHARED_LIBS; j++) {
                 p -= 4;
                 /* FIXME - handle put_user() failures */
                 if (put_user_ual(libinfo[j].loaded
                                  ? libinfo[j].start_data
                                  : UNLOADED_LIB,
                                  p))
                     return -EFAULT;
             }
         }
     }
 
     p = ((libinfo[0].start_brk + stack_len + 3) & ~3) - 4;
     DBG_FLT("p=%x\n", (int)p);
 
     /* Copy argv/envp.  */
     p = copy_strings(p, bprm->envc, bprm->envp);
     p = copy_strings(p, bprm->argc, bprm->argv);
     /* Align stack.  */
     sp = p & ~(abi_ulong)(sizeof(abi_ulong) - 1);
     /* Enforce final stack alignment of 16 bytes.  This is sufficient
        for all current targets, and excess alignment is harmless.  */
     stack_len = bprm->envc + bprm->argc + 2;
     stack_len += flat_argvp_envp_on_stack() ? 2 : 0; /* arvg, argp */
     stack_len += 1; /* argc */
     stack_len *= sizeof(abi_ulong);
     sp -= (sp - stack_len) & 15;
     sp = loader_build_argptr(bprm->envc, bprm->argc, sp, p,
                              flat_argvp_envp_on_stack());
 
     /* Fake some return addresses to ensure the call chain will
      * initialise library in order for us.  We are required to call
      * lib 1 first, then 2, ... and finally the main program (id 0).
      */
     start_addr = libinfo[0].entry;
 
 #ifdef CONFIG_BINFMT_SHARED_FLAT
 #error here
     for (i = MAX_SHARED_LIBS-1; i>0; i--) {
             if (libinfo[i].loaded) {
                     /* Push previous first to call address */
                     --sp;
                     if (put_user_ual(start_addr, sp))
                         return -EFAULT;
                     start_addr = libinfo[i].entry;
             }
     }
 #endif
 
     /* Stash our initial stack pointer into the mm structure */
     info->start_code = libinfo[0].start_code;
     info->end_code = libinfo[0].start_code + libinfo[0].text_len;
     info->start_data = libinfo[0].start_data;
     info->end_data = libinfo[0].end_data;
     info->start_brk = libinfo[0].start_brk;
     info->start_stack = sp;
     info->stack_limit = libinfo[0].start_brk;
     info->entry = start_addr;
     info->code_offset = info->start_code;
     info->data_offset = info->start_data - libinfo[0].text_len;
 
     DBG_FLT("start_thread(entry=0x%x, start_stack=0x%x)\n",
             (int)info->entry, (int)info->start_stack);
 
     return 0;
 }