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/* vms-misc.c -- Miscellaneous functions for VAX (openVMS/VAX) and

   EVAX (openVMS/Alpha) files.

   Copyright 1996, 1997, 1998, 1999 Free Software Foundation, Inc.

   Written by Klaus K"ampf (kkaempf@rmi.de)

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, write to the Free Software

Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#if __STDC__

#include <stdarg.h>

#endif

#include "bfd.h"

#include "sysdep.h"

#include "bfdlink.h"

#include "libbfd.h"

#include "vms.h"

/*-----------------------------------------------------------------------------*/

#if VMS_DEBUG

/* debug functions */

/* debug function for all vms extensions

   evaluates environment variable VMS_DEBUG for a

   numerical value on the first call

   all error levels below this value are printed

   levels:

   1    toplevel bfd calls (functions from the bfd vector)

   2    functions called by bfd calls

   ...

   9    almost everything

   level is also identation level. Indentation is performed

   if level > 0

        */

#if __STDC__

void

_bfd_vms_debug (int level, char *format, ...)

{

  static int min_level = -1;

  static FILE *output = NULL;

  char *eptr;

  va_list args;

  int abslvl = (level > 0)?level:-level;

  if (min_level == -1)

    {

      if ((eptr = getenv("VMS_DEBUG")) != NULL)

        {

          min_level = atoi(eptr);

          output = stderr;

        }

      else

        min_level = 0;

    }

  if (output == NULL)

    return;

  if (abslvl > min_level)

    return;

  while(--level>0)

    fprintf(output, " ");

  va_start(args, format);

  vfprintf(output, format, args);

  fflush(output);

  va_end(args);

  return;

}

#else /* not __STDC__ */

void

_bfd_vms_debug (level, format, a1, a2, a3, a4, a5, a6)

     int level;

     char *format;

     long a1; long a2; long a3;

     long a4; long a5; long a6;

{

  static int min_level = -1;

  static FILE *output = NULL;

  char *eptr;

  if (min_level == -1)

    {

      if ((eptr = getenv("VMS_DEBUG")) != NULL)

        {

          min_level = atoi(eptr);

          output = stderr;

        }

      else

        min_level = 0;

    }

  if (output == NULL)

    return;

  if (level > min_level)

    return;

  while(--level>0)

    fprintf(output, " ");

  fprintf(output, format, a1, a2, a3, a4, a5, a6);

  fflush(output);

  return;

}

#endif /* __STDC__ */

/* a debug function

   hex dump 'size' bytes starting at 'ptr'  */

void

_bfd_hexdump (level, ptr, size, offset)

     int level;

     unsigned char *ptr;

     int size;

     int offset;

{

  unsigned char *lptr = ptr;

  int count = 0;

  long start = offset;

  while (size-- > 0)

    {

      if ((count%16) == 0)

        vms_debug (level, "%08lx:", start);

      vms_debug (-level, " %02x", *ptr++);

      count++;

      start++;

      if (size == 0)

        {

          while ((count%16) != 0)

            {

              vms_debug (-level, "   ");

              count++;

            }

        }

      if ((count%16) == 0)

        {

          vms_debug (-level, " ");

          while (lptr < ptr)

            {

              vms_debug (-level, "%c", (*lptr < 32)?'.':*lptr);

              lptr++;

            }

          vms_debug (-level, "\n");

        }

    }

  if ((count%16) != 0)

    vms_debug (-level, "\n");

  return;

}

#endif

/* hash functions

   These are needed when reading an object file.  */

/* allocate new vms_hash_entry

   keep the symbol name and a pointer to the bfd symbol in the table  */

struct bfd_hash_entry *

_bfd_vms_hash_newfunc (entry, table, string)

     struct bfd_hash_entry *entry;

     struct bfd_hash_table *table;

     const char *string;

{

  vms_symbol_entry *ret;

#if VMS_DEBUG

  vms_debug (5, "_bfd_vms_hash_newfunc(%p, %p, %s)\n", entry, table, string);

#endif

  if (entry == (struct bfd_hash_entry *)NULL)

    {

      ret = (vms_symbol_entry *)

              bfd_hash_allocate (table, sizeof (vms_symbol_entry));

      if (ret == (vms_symbol_entry *) NULL)

        {

          bfd_set_error (bfd_error_no_memory);

          return (struct bfd_hash_entry *)NULL;

        }

      entry = (struct bfd_hash_entry *) ret;

    }

  /* Call the allocation method of the base class.  */

  ret = (vms_symbol_entry *) bfd_hash_newfunc (entry, table, string);

#if VMS_DEBUG

  vms_debug (6, "_bfd_vms_hash_newfunc ret %p\n", ret);

#endif

  ret->symbol = (asymbol *)NULL;

  return (struct bfd_hash_entry *)ret;

}

/* object file input functions */

/* Return type and length from record header (buf) on Alpha.  */

void

_bfd_vms_get_header_values (abfd, buf, type, length)

     bfd *abfd ATTRIBUTE_UNUSED;

     unsigned char *buf;

     int *type;

     int *length;

{

  if (type != 0)

    *type = bfd_getl16 (buf);

  buf += 2;

  if (length != 0)

    *length = bfd_getl16 (buf);

#if VMS_DEBUG

  vms_debug (10, "_bfd_vms_get_header_values type %x, length %x\n", (type?*type:0), (length?*length:0));

#endif

  return;

}

/* Get next record from object file to vms_buf

   set PRIV(buf_size) and return it

   this is a little tricky since it should be portable.

   the openVMS object file has 'variable length' which means that

   read() returns data in chunks of (hopefully) correct and expected

   size. The linker (and other tools on vms) depend on that. Unix doesn't

   know about 'formatted' files, so reading and writing such an object

   file in a unix environment is not trivial.

   With the tool 'file' (available on all vms ftp sites), one

   can view and change the attributes of a file. Changing from

   'variable length' to 'fixed length, 512 bytes' reveals the

   record length at the first 2 bytes of every record. The same

   happens during the transfer of object files from vms to unix,

   at least with ucx, dec's implementation of tcp/ip.

   The vms format repeats the length at bytes 2 & 3 of every record.

   On the first call (file_format == FF_UNKNOWN) we check if

   the first and the third byte pair (!) of the record match.

   If they do it's an object file in an unix environment or with

   wrong attributes (FF_FOREIGN), else we should be in a vms

   environment where read() returns the record size (FF_NATIVE).

   reading is always done in 2 steps.

   first just the record header is read and the length extracted

   by get_header_values

   then the read buffer is adjusted and the remaining bytes are

   read in.

   all file i/o is always done on even file positions  */

int

_bfd_vms_get_record (abfd)

     bfd *abfd;

{

  int test_len, test_start, remaining;

  unsigned char *vms_buf;

#if VMS_DEBUG

  vms_debug (8, "_bfd_vms_get_record\n");

#endif

  /* minimum is 6 bytes on Alpha

     (2 bytes length, 2 bytes record id, 2 bytes length repeated)

     on VAX there's no length information in the record

     so start with OBJ_S_C_MAXRECSIZ  */

  if (PRIV(buf_size) == 0)

    {

      if (PRIV(is_vax))

        {

          PRIV(vms_buf) = (unsigned char *) malloc (OBJ_S_C_MAXRECSIZ);

          PRIV(buf_size) = OBJ_S_C_MAXRECSIZ;

          PRIV(file_format) = FF_VAX;

        }

      else

        PRIV(vms_buf) = (unsigned char *) malloc (6);

    }

  vms_buf = PRIV(vms_buf);

  if (vms_buf == 0)

    {

      bfd_set_error (bfd_error_no_memory);

      return -1;

    }

  switch (PRIV(file_format))

    {

      case FF_UNKNOWN:

      case FF_FOREIGN:

        test_len = 6;                   /* probe 6 bytes */

        test_start = 2;                 /* where the record starts */

      break;

      case FF_NATIVE:

        test_len = 4;

        test_start = 0;

      break;

      case FF_VAX:

        test_len = 0;

        test_start = 0;

      break;

  }

  /* skip odd alignment byte  */

  if (bfd_tell (abfd) & 1)

    {

      if (bfd_read (PRIV(vms_buf), 1, 1, abfd) != 1)

        {

          bfd_set_error (bfd_error_file_truncated);

          return 0;

        }

    }

  /* read the record header on Alpha.  */

  if ((test_len != 0)

      && (bfd_read (PRIV(vms_buf), 1, test_len, abfd)

          != (bfd_size_type) test_len))

    {

      bfd_set_error (bfd_error_file_truncated);

      return 0;

    }

  /* check file format on first call  */

  if (PRIV(file_format) == FF_UNKNOWN)

    {                                           /* record length repeats ? */

      if ( (vms_buf[0] == vms_buf[4])

        && (vms_buf[1] == vms_buf[5]))

        {

          PRIV(file_format) = FF_FOREIGN;       /* Y: foreign environment */

          test_start = 2;

        }

      else

        {

          PRIV(file_format) = FF_NATIVE;        /* N: native environment */

          test_start = 0;

        }

    }

  if (PRIV(is_vax))

    {

      PRIV(rec_length) = bfd_read (vms_buf, 1, PRIV(buf_size), abfd);

      if (PRIV(rec_length) <= 0)

        {

          bfd_set_error (bfd_error_file_truncated);

          return 0;

        }

      PRIV(vms_rec) = vms_buf;

    }

  else          /* Alpha  */

    {

      /* extract vms record length  */

      _bfd_vms_get_header_values (abfd, vms_buf+test_start, NULL,

                                  &PRIV(rec_length));

      if (PRIV(rec_length) <= 0)

        {

          bfd_set_error (bfd_error_file_truncated);

          return 0;

        }

      /* that's what the linker manual says  */

      if (PRIV(rec_length) > EOBJ_S_C_MAXRECSIZ)

        {

          bfd_set_error (bfd_error_file_truncated);

          return 0;

        }

      /* adjust the buffer  */

      if (PRIV(rec_length) > PRIV(buf_size))

        {

          PRIV(vms_buf) = (unsigned char *) realloc (vms_buf, PRIV(rec_length));

          vms_buf = PRIV(vms_buf);

          if (vms_buf == 0)

            {

              bfd_set_error (bfd_error_no_memory);

              return -1;

            }

          PRIV(buf_size) = PRIV(rec_length);

        }

      /* read the remaining record  */

      remaining = PRIV(rec_length) - test_len + test_start;

#if VMS_DEBUG

      vms_debug (10, "bfd_read remaining %d\n", remaining);

#endif

      if (bfd_read (vms_buf + test_len, 1, remaining, abfd) !=

          (bfd_size_type) remaining)

        {

          bfd_set_error (bfd_error_file_truncated);

          return 0;

        }

      PRIV(vms_rec) = vms_buf + test_start;

    }

#if VMS_DEBUG

  vms_debug (11, "bfd_read rec_length %d\n", PRIV(rec_length));

#endif

  return PRIV(rec_length);

}

/* get next vms record from file

   update vms_rec and rec_length to new (remaining) values  */

int

_bfd_vms_next_record (abfd)

     bfd *abfd;

{

#if VMS_DEBUG

  vms_debug (8, "_bfd_vms_next_record (len %d, size %d)\n",

              PRIV(rec_length), PRIV(rec_size));

#endif

  if (PRIV(rec_length) > 0)

    {

      PRIV(vms_rec) += PRIV(rec_size);

    }

  else

    {

      if (_bfd_vms_get_record (abfd) <= 0)

        return -1;

    }

  if (PRIV(is_vax))

    {

      PRIV(rec_type) = *(PRIV(vms_rec));

      PRIV(rec_size) = PRIV(rec_length);

    }

  else

    {

      _bfd_vms_get_header_values (abfd, PRIV(vms_rec), &PRIV(rec_type),

                                  &PRIV(rec_size));

    }

  PRIV(rec_length) -= PRIV(rec_size);

#if VMS_DEBUG

  vms_debug (8, "_bfd_vms_next_record: rec %p, size %d, length %d, type %d\n",

              PRIV(vms_rec), PRIV(rec_size), PRIV(rec_length),

              PRIV(rec_type));

#endif

  return PRIV(rec_type);

}

/* Copy sized string (string with fixed length) to new allocated area

   size is string length (size of record)  */

char *

_bfd_vms_save_sized_string (str, size)

     unsigned char *str;

     int size;

{

  char *newstr = bfd_malloc (size + 1);

  if (newstr == NULL)

    return 0;

  strncpy (newstr, (char *)str, size);

  newstr[size] = 0;

  return newstr;

}

/* Copy counted string (string with length at first byte) to new allocated area

   ptr points to length byte on entry  */

char *

_bfd_vms_save_counted_string (ptr)

     unsigned char *ptr;

{

  int len = *ptr++;

  return _bfd_vms_save_sized_string (ptr, len);

}

/* stack routines for vms ETIR commands */

/* Push value and section index  */

void

_bfd_vms_push (abfd, val, psect)

     bfd *abfd;

     uquad val;

     int psect;

{

  static int last_psect;

#if VMS_DEBUG

  vms_debug (4, "<push %016lx(%d) at %d>\n", val, psect, PRIV(stackptr));

#endif

  if (psect >= 0)

    last_psect = psect;

  PRIV(stack[PRIV(stackptr)]).value = val;

  PRIV(stack[PRIV(stackptr)]).psect = last_psect;

  PRIV(stackptr)++;

  if (PRIV(stackptr) >= STACKSIZE)

    {

      bfd_set_error (bfd_error_bad_value);

      (*_bfd_error_handler) (_("Stack overflow (%d) in _bfd_vms_push"), PRIV(stackptr));

      exit (1);

    }

  return;

}

/* Pop value and section index  */

uquad

_bfd_vms_pop (abfd, psect)

     bfd *abfd;

     int *psect;

{

  uquad value;

  if (PRIV(stackptr) == 0)

    {

      bfd_set_error (bfd_error_bad_value);

      (*_bfd_error_handler) (_("Stack underflow in _bfd_vms_pop"));

      exit (1);

    }

  PRIV(stackptr)--;

  value = PRIV(stack[PRIV(stackptr)]).value;

  if ((psect != NULL) && (PRIV(stack[PRIV(stackptr)]).psect >= 0))

    *psect = PRIV(stack[PRIV(stackptr)]).psect;

#if VMS_DEBUG

  vms_debug (4, "<pop %016lx(%d)>\n", value, PRIV(stack[PRIV(stackptr)]).psect);

#endif

  return value;

}

/* object file output functions */

/* GAS tends to write sections in little chunks (bfd_set_section_contents)

   which we can't use directly. So we save the little chunks in linked

   lists (one per section) and write them later.  */

/* Add a new vms_section structure to vms_section_table

   - forward chaining -  */

static vms_section *

add_new_contents (abfd, section)

     bfd *abfd;

     sec_ptr section;

{

  vms_section *sptr, *newptr;

  sptr = PRIV(vms_section_table)[section->index];

  if (sptr != NULL)

    return sptr;

  newptr = (vms_section *) bfd_malloc (sizeof (vms_section));

  if (newptr == (vms_section *) NULL)

    return NULL;

  newptr->contents = (unsigned char *) bfd_alloc (abfd, (int)section->_raw_size);

  if (newptr->contents == (unsigned char *)NULL)

    return NULL;

  newptr->offset = 0;

  newptr->size = section->_raw_size;

  newptr->next = 0;

  PRIV(vms_section_table)[section->index] = newptr;

  return newptr;

}

/* Save section data & offset to an vms_section structure

   vms_section_table[] holds the vms_section chain  */

boolean

_bfd_save_vms_section (abfd, section, data, offset, count)

     bfd *abfd;

     sec_ptr section;

     PTR data;

     file_ptr offset;

     bfd_size_type count;

{

  vms_section *sptr;

  if (section->index >= VMS_SECTION_COUNT)

    {

      bfd_set_error (bfd_error_nonrepresentable_section);

      return false;

    }

  if (count == (bfd_size_type)0)

    return true;

  sptr = add_new_contents (abfd, section);

  if (sptr == NULL)

    return false;

  memcpy (sptr->contents + offset, data, (size_t) count);

  return true;

}

/* Get vms_section pointer to saved contents for section # index  */

vms_section *

_bfd_get_vms_section (abfd, index)

     bfd *abfd;

     int index;

{

  if (index >=  VMS_SECTION_COUNT)

    {

      bfd_set_error (bfd_error_nonrepresentable_section);

      return NULL;

    }

  return PRIV(vms_section_table)[index];

}

/* Object output routines  */

/* Begin new record or record header

   write 2 bytes rectype

   write 2 bytes record length (filled in at flush)

   write 2 bytes header type (ommitted if rechead == -1)  */

void

_bfd_vms_output_begin (abfd, rectype, rechead)

     bfd *abfd;

     int rectype;

     int rechead;

{

#if VMS_DEBUG

  vms_debug (6, "_bfd_vms_output_begin(type %d, head %d)\n", rectype,

              rechead);

#endif

  _bfd_vms_output_short (abfd,rectype);

  /* save current output position to fill in lenght later  */

  if (PRIV(push_level) > 0)

    PRIV(length_pos) = PRIV(output_size);

#if VMS_DEBUG

  vms_debug (6, "_bfd_vms_output_begin: length_pos = %d\n",

              PRIV(length_pos));

#endif

  _bfd_vms_output_short (abfd,0);                /* placeholder for length */

  if (rechead != -1)

    _bfd_vms_output_short (abfd,rechead);

  return;

}

/* Set record/subrecord alignment  */

void

_bfd_vms_output_alignment (abfd, alignto)

     bfd *abfd;

     int alignto;

{

#if VMS_DEBUG