bfd/vms-misc.c

   1 /* vms-misc.c -- BFD back-end for VMS/VAX (openVMS/VAX) and
   2    EVAX (openVMS/Alpha) files.
   3    Copyright (C) 1996-2017 Free Software Foundation, Inc.
   4
   5    Miscellaneous functions.
   6
   7    Written by Klaus K"ampf (kkaempf@rmi.de)
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  22    MA 02110-1301, USA.  */
  23
  24 #if __STDC__
  25 #include <stdarg.h>
  26 #endif
  27
  28 #include "sysdep.h"
  29 #include "bfd.h"
  30 #include "bfdlink.h"
  31 #include "libbfd.h"
  32 #include "safe-ctype.h"
  33
  34 #ifdef VMS
  35 #define __NEW_STARLET
  36 #include <rms.h>
  37 #include <unixlib.h>
  38 #include <gen64def.h>
  39 #include <starlet.h>
  40 #define RME$C_SETRFM 0x00000001
  41 #include <unistd.h>
  42 #endif
  43 #include <time.h>
  44
  45 #include "vms.h"
  46 #include "vms/emh.h"
  47
  48 #if VMS_DEBUG
  49 /* Debug functions.  */
  50
  51 /* Debug function for all vms extensions evaluates environment
  52    variable VMS_DEBUG for a numerical value on the first call all
  53    error levels below this value are printed:
  54
  55    Levels:
  56    1    toplevel bfd calls (functions from the bfd vector)
  57    2    functions called by bfd calls
  58    ...
  59    9    almost everything
  60
  61    Level is also indentation level. Indentation is performed
  62    if level > 0.  */
  63
  64 void
  65 _bfd_vms_debug (int level, char *format, ...)
  66 {
  67   static int min_level = -1;
  68   static FILE *output = NULL;
  69   char *eptr;
  70   va_list args;
  71   int abslvl = (level > 0) ? level : - level;
  72
  73   if (min_level == -1)
  74     {
  75       if ((eptr = getenv ("VMS_DEBUG")) != NULL)
  76         {
  77           min_level = atoi (eptr);
  78           output = stderr;
  79         }
  80       else
  81         min_level = 0;
  82     }
  83   if (output == NULL)
  84     return;
  85   if (abslvl > min_level)
  86     return;
  87
  88   while (--level > 0)
  89     fprintf (output, " ");
  90   va_start (args, format);
  91   vfprintf (output, format, args);
  92   fflush (output);
  93   va_end (args);
  94 }
  95
  96 /* A debug function
  97    hex dump 'size' bytes starting at 'ptr'.  */
  98
  99 void
 100 _bfd_hexdump (int level, unsigned char *ptr, int size, int offset)
 101 {
 102   unsigned char *lptr = ptr;
 103   int count = 0;
 104   long start = offset;
 105
 106   while (size-- > 0)
 107     {
 108       if ((count % 16) == 0)
 109         vms_debug (level, "%08lx:", start);
 110       vms_debug (-level, " %02x", *ptr++);
 111       count++;
 112       start++;
 113       if (size == 0)
 114         {
 115           while ((count % 16) != 0)
 116             {
 117               vms_debug (-level, "   ");
 118               count++;
 119             }
 120         }
 121       if ((count % 16) == 0)
 122         {
 123           vms_debug (-level, " ");
 124           while (lptr < ptr)
 125             {
 126               vms_debug (-level, "%c", (*lptr < 32) ? '.' : *lptr);
 127               lptr++;
 128             }
 129           vms_debug (-level, "\n");
 130         }
 131     }
 132   if ((count % 16) != 0)
 133     vms_debug (-level, "\n");
 134 }
 135 #endif
 136 \f
 137
 138 /* Copy sized string (string with fixed size) to new allocated area.
 139    Size is string size (size of record).  */
 140
 141 char *
 142 _bfd_vms_save_sized_string (unsigned char *str, unsigned int size)
 143 {
 144   char *newstr = bfd_malloc ((bfd_size_type) size + 1);
 145
 146   if (newstr == NULL)
 147     return NULL;
 148   memcpy (newstr, (char *) str, (size_t) size);
 149   newstr[size] = 0;
 150
 151   return newstr;
 152 }
 153
 154 /* Copy counted string (string with size at first byte) to new allocated area.
 155    PTR points to size byte on entry.  */
 156
 157 char *
 158 _bfd_vms_save_counted_string (unsigned char *ptr, unsigned int maxlen)
 159 {
 160   unsigned int len = *ptr++;
 161
 162   if (len > maxlen)
 163     return NULL;
 164   return _bfd_vms_save_sized_string (ptr, len);
 165 }
 166 \f
 167 /* Object output routines.   */
 168
 169 /* Begin new record.
 170    Write 2 bytes rectype and 2 bytes record length.  */
 171
 172 void
 173 _bfd_vms_output_begin (struct vms_rec_wr *recwr, int rectype)
 174 {
 175   vms_debug2 ((6, "_bfd_vms_output_begin (type %d)\n", rectype));
 176
 177   /* Record must have been closed.  */
 178   BFD_ASSERT (recwr->size == 0);
 179
 180   _bfd_vms_output_short (recwr, (unsigned int) rectype);
 181
 182   /* Placeholder for length.  */
 183   _bfd_vms_output_short (recwr, 0);
 184 }
 185
 186 /* Begin new sub-record.
 187    Write 2 bytes rectype, and 2 bytes record length.  */
 188
 189 void
 190 _bfd_vms_output_begin_subrec (struct vms_rec_wr *recwr, int rectype)
 191 {
 192   vms_debug2 ((6, "_bfd_vms_output_begin_subrec (type %d)\n", rectype));
 193
 194   /* Subrecord must have been closed.  */
 195   BFD_ASSERT (recwr->subrec_offset == 0);
 196
 197   /* Save start of subrecord offset.  */
 198   recwr->subrec_offset = recwr->size;
 199
 200   /* Subrecord type.  */
 201   _bfd_vms_output_short (recwr, (unsigned int) rectype);
 202
 203   /* Placeholder for length.  */
 204   _bfd_vms_output_short (recwr, 0);
 205 }
 206
 207 /* Set record/subrecord alignment.   */
 208
 209 void
 210 _bfd_vms_output_alignment (struct vms_rec_wr *recwr, int alignto)
 211 {
 212   vms_debug2 ((6, "_bfd_vms_output_alignment (%d)\n", alignto));
 213   recwr->align = alignto;
 214 }
 215
 216 /* Align the size of the current record (whose length is LENGTH).
 217    Warning: this obviously changes the record (and the possible subrecord)
 218    length.  */
 219
 220 static void
 221 _bfd_vms_output_align (struct vms_rec_wr *recwr, unsigned int length)
 222 {
 223   unsigned int real_size = recwr->size;
 224   unsigned int aligncount;
 225
 226   /* Pad with 0 if alignment is required.  */
 227   aligncount = (recwr->align - (length % recwr->align)) % recwr->align;
 228   vms_debug2 ((6, "align: adding %d bytes\n", aligncount));
 229   while (aligncount-- > 0)
 230     recwr->buf[real_size++] = 0;
 231
 232   recwr->size = real_size;
 233 }
 234
 235 /* Ends current sub-record.  Set length field.  */
 236
 237 void
 238 _bfd_vms_output_end_subrec (struct vms_rec_wr *recwr)
 239 {
 240   int real_size = recwr->size;
 241   int length;
 242
 243   /* Subrecord must be open.  */
 244   BFD_ASSERT (recwr->subrec_offset != 0);
 245
 246   length = real_size - recwr->subrec_offset;
 247
 248   if (length == 0)
 249     return;
 250
 251   _bfd_vms_output_align (recwr, length);
 252
 253   /* Put length to buffer.  */
 254   bfd_putl16 ((bfd_vma) (recwr->size - recwr->subrec_offset),
 255               recwr->buf + recwr->subrec_offset + 2);
 256
 257   /* Close the subrecord.  */
 258   recwr->subrec_offset = 0;
 259 }
 260
 261 /* Ends current record (and write it).  */
 262
 263 void
 264 _bfd_vms_output_end (bfd *abfd, struct vms_rec_wr *recwr)
 265 {
 266   vms_debug2 ((6, "_bfd_vms_output_end (size %u)\n", recwr->size));
 267
 268   /* Subrecord must have been closed.  */
 269   BFD_ASSERT (recwr->subrec_offset == 0);
 270
 271   if (recwr->size == 0)
 272     return;
 273
 274   _bfd_vms_output_align (recwr, recwr->size);
 275
 276   /* Write the length word.  */
 277   bfd_putl16 ((bfd_vma) recwr->size, recwr->buf + 2);
 278
 279   /* File is open in undefined (UDF) format on VMS, but ultimately will be
 280      converted to variable length (VAR) format.  VAR format has a length
 281      word first which must be explicitly output in UDF format.  */
 282   /* So, first the length word.  */
 283   bfd_bwrite (recwr->buf + 2, 2, abfd);
 284
 285   /* Align.  */
 286   if (recwr->size & 1)
 287     recwr->buf[recwr->size++] = 0;
 288
 289   /* Then the record.  */
 290   bfd_bwrite (recwr->buf, (size_t) recwr->size, abfd);
 291
 292   recwr->size = 0;
 293 }
 294
 295 /* Check remaining buffer size.  Return what's left.  */
 296
 297 int
 298 _bfd_vms_output_check (struct vms_rec_wr *recwr, int size)
 299 {
 300   vms_debug2 ((6, "_bfd_vms_output_check (%d)\n", size));
 301
 302   return (MAX_OUTREC_SIZE - (recwr->size + size + MIN_OUTREC_LUFT));
 303 }
 304
 305 /* Output byte (8 bit) value.  */
 306
 307 void
 308 _bfd_vms_output_byte (struct vms_rec_wr *recwr, unsigned int value)
 309 {
 310   vms_debug2 ((6, "_bfd_vms_output_byte (%02x)\n", value));
 311
 312   *(recwr->buf + recwr->size) = value;
 313   recwr->size += 1;
 314 }
 315
 316 /* Output short (16 bit) value.  */
 317
 318 void
 319 _bfd_vms_output_short (struct vms_rec_wr *recwr, unsigned int value)
 320 {
 321   vms_debug2 ((6, "_bfd_vms_output_short (%04x)\n", value));
 322
 323   bfd_putl16 ((bfd_vma) value & 0xffff, recwr->buf + recwr->size);
 324   recwr->size += 2;
 325 }
 326
 327 /* Output long (32 bit) value.  */
 328
 329 void
 330 _bfd_vms_output_long (struct vms_rec_wr *recwr, unsigned long value)
 331 {
 332   vms_debug2 ((6, "_bfd_vms_output_long (%08lx)\n", value));
 333
 334   bfd_putl32 ((bfd_vma) value, recwr->buf + recwr->size);
 335   recwr->size += 4;
 336 }
 337
 338 /* Output quad (64 bit) value.  */
 339
 340 void
 341 _bfd_vms_output_quad (struct vms_rec_wr *recwr, bfd_vma value)
 342 {
 343   vms_debug2 ((6, "_bfd_vms_output_quad (%08lx)\n", (unsigned long)value));
 344
 345   bfd_putl64 (value, recwr->buf + recwr->size);
 346   recwr->size += 8;
 347 }
 348
 349 /* Output c-string as counted string.  */
 350
 351 void
 352 _bfd_vms_output_counted (struct vms_rec_wr *recwr, const char *value)
 353 {
 354   int len;
 355
 356   vms_debug2 ((6, "_bfd_vms_output_counted (%s)\n", value));
 357
 358   len = strlen (value);
 359   if (len == 0)
 360     {
 361       _bfd_error_handler (_("_bfd_vms_output_counted called with zero bytes"));
 362       return;
 363     }
 364   if (len > 255)
 365     {
 366       _bfd_error_handler (_("_bfd_vms_output_counted called with too many bytes"));
 367       return;
 368     }
 369   _bfd_vms_output_byte (recwr, (unsigned int) len & 0xff);
 370   _bfd_vms_output_dump (recwr, (const unsigned char *)value, len);
 371 }
 372
 373 /* Output character area.  */
 374
 375 void
 376 _bfd_vms_output_dump (struct vms_rec_wr *recwr, const unsigned char *data, int len)
 377 {
 378   vms_debug2 ((6, "_bfd_vms_output_dump (%d)\n", len));
 379
 380   if (len == 0)
 381     return;
 382
 383   memcpy (recwr->buf + recwr->size, data, (size_t) len);
 384   recwr->size += len;
 385 }
 386
 387 /* Output count bytes of value.  */
 388
 389 void
 390 _bfd_vms_output_fill (struct vms_rec_wr *recwr, int value, int count)
 391 {
 392   vms_debug2 ((6, "_bfd_vms_output_fill (val %02x times %d)\n", value, count));
 393
 394   if (count == 0)
 395     return;
 396   memset (recwr->buf + recwr->size, value, (size_t) count);
 397   recwr->size += count;
 398 }
 399
 400 #ifdef VMS
 401 /* Convert the file to variable record length format. This is done
 402    using undocumented system call sys$modify().
 403    Pure VMS version.  */
 404
 405 static void
 406 vms_convert_to_var (char * vms_filename)
 407 {
 408   struct FAB fab = cc$rms_fab;
 409
 410   fab.fab$l_fna = vms_filename;
 411   fab.fab$b_fns = strlen (vms_filename);
 412   fab.fab$b_fac = FAB$M_PUT;
 413   fab.fab$l_fop = FAB$M_ESC;
 414   fab.fab$l_ctx = RME$C_SETRFM;
 415
 416   sys$open (&fab);
 417
 418   fab.fab$b_rfm = FAB$C_VAR;
 419
 420   sys$modify (&fab);
 421   sys$close (&fab);
 422 }
 423
 424 static int
 425 vms_convert_to_var_1 (char *filename, int type)
 426 {
 427   if (type != DECC$K_FILE)
 428     return FALSE;
 429   vms_convert_to_var (filename);
 430   return TRUE;
 431 }
 432
 433 /* Convert the file to variable record length format. This is done
 434    using undocumented system call sys$modify().
 435    Unix filename version.  */
 436
 437 int
 438 _bfd_vms_convert_to_var_unix_filename (const char *unix_filename)
 439 {
 440   if (decc$to_vms (unix_filename, &vms_convert_to_var_1, 0, 1) != 1)
 441     return FALSE;
 442   return TRUE;
 443 }
 444 #endif /* VMS */
 445
 446 /* Manufacture a VMS like time on a unix based system.
 447    stolen from obj-vms.c.  */
 448
 449 unsigned char *
 450 get_vms_time_string (void)
 451 {
 452   static unsigned char tbuf[18];
 453 #ifndef VMS
 454   char *pnt;
 455   time_t timeb;
 456
 457   time (& timeb);
 458   pnt = ctime (&timeb);
 459   pnt[3] = 0;
 460   pnt[7] = 0;
 461   pnt[10] = 0;
 462   pnt[16] = 0;
 463   pnt[24] = 0;
 464   sprintf ((char *) tbuf, "%2s-%3s-%s %s",
 465            pnt + 8, pnt + 4, pnt + 20, pnt + 11);
 466 #else
 467   struct
 468   {
 469     int Size;
 470     unsigned char *Ptr;
 471   } Descriptor;
 472   Descriptor.Size = 17;
 473   Descriptor.Ptr = tbuf;
 474   SYS$ASCTIM (0, &Descriptor, 0, 0);
 475 #endif /* not VMS */
 476
 477   vms_debug2 ((6, "vmstimestring:'%s'\n", tbuf));
 478
 479   return tbuf;
 480 }
 481
 482 /* Create module name from filename (ie, extract the basename and convert it
 483    in upper cases).  Works on both VMS and UNIX pathes.
 484    The result has to be free().  */
 485
 486 char *
 487 vms_get_module_name (const char *filename, bfd_boolean upcase)
 488 {
 489   char *fname, *fptr;
 490   const char *fout;
 491
 492   /* Strip VMS path.  */
 493   fout = strrchr (filename, ']');
 494   if (fout == NULL)
 495     fout = strchr (filename, ':');
 496   if (fout != NULL)
 497     fout++;
 498   else
 499     fout = filename;
 500
 501   /* Strip UNIX path.  */
 502   fptr = strrchr (fout, '/');
 503   if (fptr != NULL)
 504     fout = fptr + 1;
 505
 506   fname = strdup (fout);
 507
 508   /* Strip suffix.  */
 509   fptr = strrchr (fname, '.');
 510   if (fptr != 0)
 511     *fptr = 0;
 512
 513   /* Convert to upper case and truncate at 31 characters.
 514      (VMS object file format restricts module name length to 31).  */
 515   fptr = fname;
 516   for (fptr = fname; *fptr != 0; fptr++)
 517     {
 518       if (*fptr == ';' || (fptr - fname) >= 31)
 519         {
 520           *fptr = 0;
 521           break;
 522         }
 523       if (upcase)
 524         *fptr = TOUPPER (*fptr);
 525     }
 526   return fname;
 527 }
 528
 529 /* Compared to usual UNIX time_t, VMS time has less limits:
 530    -  64 bit (63 bits in fact as the MSB must be 0)
 531    -  100ns granularity
 532    -  epoch is Nov 17, 1858.
 533    Here has the constants and the routines used to convert VMS from/to UNIX time.
 534    The conversion routines don't assume 64 bits arithmetic.
 535
 536    Here we assume that the definition of time_t is the UNIX one, ie integer
 537    type, expressing seconds since the epoch.  */
 538
 539 /* UNIX time granularity for VMS, ie 1s / 100ns.  */
 540 #define VMS_TIME_FACTOR 10000000
 541
 542 /* Number of seconds since VMS epoch of the UNIX epoch.  */
 543 #define VMS_TIME_OFFSET 3506716800U
 544
 545 /* Convert a VMS time to a unix time.  */
 546
 547 time_t
 548 vms_time_to_time_t (unsigned int hi, unsigned int lo)
 549 {
 550   unsigned int tmp;
 551   unsigned int rlo;
 552   int i;
 553   time_t res;
 554
 555   /* First convert to seconds.  */
 556   tmp = hi % VMS_TIME_FACTOR;
 557   hi = hi / VMS_TIME_FACTOR;
 558   rlo = 0;
 559   for (i = 0; i < 4; i++)
 560     {
 561       tmp = (tmp << 8) | (lo >> 24);
 562       lo <<= 8;
 563
 564       rlo = (rlo << 8) | (tmp / VMS_TIME_FACTOR);
 565       tmp %= VMS_TIME_FACTOR;
 566     }
 567   lo = rlo;
 568
 569   /* Return 0 in case of overflow.  */
 570   if (hi > 1
 571       || (hi == 1 && lo >= VMS_TIME_OFFSET))
 572     return 0;
 573
 574   /* Return 0 in case of underflow.  */
 575   if (hi == 0 && lo < VMS_TIME_OFFSET)
 576     return 0;
 577
 578   res = lo - VMS_TIME_OFFSET;
 579   if (res <= 0)
 580     return 0;
 581   return res;
 582 }
 583
 584 /* Convert a time_t to a VMS time.  */
 585
 586 void
 587 vms_time_t_to_vms_time (time_t ut, unsigned int *hi, unsigned int *lo)
 588 {
 589   unsigned short val[4];
 590   unsigned short tmp[4];
 591   unsigned int carry;
 592   int i;
 593
 594   /* Put into val.  */
 595   val[0] = ut & 0xffff;
 596   val[1] = (ut >> 16) & 0xffff;
 597   val[2] = sizeof (ut) > 4 ? (ut >> 32) & 0xffff : 0;
 598   val[3] = sizeof (ut) > 4 ? (ut >> 48) & 0xffff : 0;
 599
 600   /* Add offset.  */
 601   tmp[0] = VMS_TIME_OFFSET & 0xffff;
 602   tmp[1] = VMS_TIME_OFFSET >> 16;
 603   tmp[2] = 0;
 604   tmp[3] = 0;
 605   carry = 0;
 606   for (i = 0; i < 4; i++)
 607     {
 608       carry += tmp[i] + val[i];
 609       val[i] = carry & 0xffff;
 610       carry = carry >> 16;
 611     }
 612
 613   /* Multiply by factor, well first by 10000 and then by 1000.  */
 614   carry = 0;
 615   for (i = 0; i < 4; i++)
 616     {
 617       carry += val[i] * 10000;
 618       val[i] = carry & 0xffff;
 619       carry = carry >> 16;
 620     }
 621   carry = 0;
 622   for (i = 0; i < 4; i++)
 623     {
 624       carry += val[i] * 1000;
 625       val[i] = carry & 0xffff;
 626       carry = carry >> 16;
 627     }
 628
 629   /* Write the result.  */
 630   *lo = val[0] | (val[1] << 16);
 631   *hi = val[2] | (val[3] << 16);
 632 }
 633
 634 /* Convert a raw (stored in a buffer) VMS time to a unix time.  */
 635
 636 time_t
 637 vms_rawtime_to_time_t (unsigned char *buf)
 638 {
 639   unsigned int hi = bfd_getl32 (buf + 4);
 640   unsigned int lo = bfd_getl32 (buf + 0);
 641
 642   return vms_time_to_time_t (hi, lo);
 643 }
 644
 645 void
 646 vms_get_time (unsigned int *hi, unsigned int *lo)
 647 {
 648 #ifdef VMS
 649   struct _generic_64 t;
 650
 651   sys$gettim (&t);
 652   *lo = t.gen64$q_quadword;
 653   *hi = t.gen64$q_quadword >> 32;
 654 #else
 655   time_t t;
 656
 657   time (&t);
 658   vms_time_t_to_vms_time (t, hi, lo);
 659 #endif
 660 }
 661
 662 /* Get the current time into a raw buffer BUF.  */
 663
 664 void
 665 vms_raw_get_time (unsigned char *buf)
 666 {
 667   unsigned int hi, lo;
 668
 669   vms_get_time (&hi, &lo);
 670   bfd_putl32 (lo, buf + 0);
 671   bfd_putl32 (hi, buf + 4);
 672 }