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) 1996-2022 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 (bfd *abfd, unsigned char *str, size_t size)
 143 {
 144   char *newstr;
 145
 146   if (size == (size_t) -1)
 147     {
 148       bfd_set_error (bfd_error_no_memory);
 149       return NULL;
 150     }
 151   newstr = bfd_alloc (abfd, size + 1);
 152   if (newstr == NULL)
 153     return NULL;
 154   memcpy (newstr, str, size);
 155   newstr[size] = 0;
 156
 157   return newstr;
 158 }
 159
 160 /* Copy counted string (string with size at first byte) to new allocated area.
 161    PTR points to size byte on entry.  */
 162
 163 char *
 164 _bfd_vms_save_counted_string (bfd *abfd, unsigned char *ptr, size_t maxlen)
 165 {
 166   unsigned int len;
 167
 168   if (maxlen == 0)
 169     return NULL;
 170   len = *ptr++;
 171   if (len >  maxlen - 1)
 172     return NULL;
 173   return _bfd_vms_save_sized_string (abfd, ptr, len);
 174 }
 175 \f
 176 /* Object output routines.   */
 177
 178 /* Begin new record.
 179    Write 2 bytes rectype and 2 bytes record length.  */
 180
 181 void
 182 _bfd_vms_output_begin (struct vms_rec_wr *recwr, int rectype)
 183 {
 184   vms_debug2 ((6, "_bfd_vms_output_begin (type %d)\n", rectype));
 185
 186   /* Record must have been closed.  */
 187   BFD_ASSERT (recwr->size == 0);
 188
 189   _bfd_vms_output_short (recwr, (unsigned int) rectype);
 190
 191   /* Placeholder for length.  */
 192   _bfd_vms_output_short (recwr, 0);
 193 }
 194
 195 /* Begin new sub-record.
 196    Write 2 bytes rectype, and 2 bytes record length.  */
 197
 198 void
 199 _bfd_vms_output_begin_subrec (struct vms_rec_wr *recwr, int rectype)
 200 {
 201   vms_debug2 ((6, "_bfd_vms_output_begin_subrec (type %d)\n", rectype));
 202
 203   /* Subrecord must have been closed.  */
 204   BFD_ASSERT (recwr->subrec_offset == 0);
 205
 206   /* Save start of subrecord offset.  */
 207   recwr->subrec_offset = recwr->size;
 208
 209   /* Subrecord type.  */
 210   _bfd_vms_output_short (recwr, (unsigned int) rectype);
 211
 212   /* Placeholder for length.  */
 213   _bfd_vms_output_short (recwr, 0);
 214 }
 215
 216 /* Set record/subrecord alignment.   */
 217
 218 void
 219 _bfd_vms_output_alignment (struct vms_rec_wr *recwr, int alignto)
 220 {
 221   vms_debug2 ((6, "_bfd_vms_output_alignment (%d)\n", alignto));
 222   recwr->align = alignto;
 223 }
 224
 225 /* Align the size of the current record (whose length is LENGTH).
 226    Warning: this obviously changes the record (and the possible subrecord)
 227    length.  */
 228
 229 static void
 230 _bfd_vms_output_align (struct vms_rec_wr *recwr, unsigned int length)
 231 {
 232   unsigned int real_size = recwr->size;
 233   unsigned int aligncount;
 234
 235   /* Pad with 0 if alignment is required.  */
 236   aligncount = (recwr->align - (length % recwr->align)) % recwr->align;
 237   vms_debug2 ((6, "align: adding %d bytes\n", aligncount));
 238   while (aligncount-- > 0)
 239     recwr->buf[real_size++] = 0;
 240
 241   recwr->size = real_size;
 242 }
 243
 244 /* Ends current sub-record.  Set length field.  */
 245
 246 void
 247 _bfd_vms_output_end_subrec (struct vms_rec_wr *recwr)
 248 {
 249   int real_size = recwr->size;
 250   int length;
 251
 252   /* Subrecord must be open.  */
 253   BFD_ASSERT (recwr->subrec_offset != 0);
 254
 255   length = real_size - recwr->subrec_offset;
 256
 257   if (length == 0)
 258     return;
 259
 260   _bfd_vms_output_align (recwr, length);
 261
 262   /* Put length to buffer.  */
 263   bfd_putl16 ((bfd_vma) (recwr->size - recwr->subrec_offset),
 264               recwr->buf + recwr->subrec_offset + 2);
 265
 266   /* Close the subrecord.  */
 267   recwr->subrec_offset = 0;
 268 }
 269
 270 /* Ends current record (and write it).  */
 271
 272 void
 273 _bfd_vms_output_end (bfd *abfd, struct vms_rec_wr *recwr)
 274 {
 275   vms_debug2 ((6, "_bfd_vms_output_end (size %u)\n", recwr->size));
 276
 277   /* Subrecord must have been closed.  */
 278   BFD_ASSERT (recwr->subrec_offset == 0);
 279
 280   if (recwr->size == 0)
 281     return;
 282
 283   _bfd_vms_output_align (recwr, recwr->size);
 284
 285   /* Write the length word.  */
 286   bfd_putl16 ((bfd_vma) recwr->size, recwr->buf + 2);
 287
 288   /* File is open in undefined (UDF) format on VMS, but ultimately will be
 289      converted to variable length (VAR) format.  VAR format has a length
 290      word first which must be explicitly output in UDF format.  */
 291   /* So, first the length word.  */
 292   bfd_bwrite (recwr->buf + 2, 2, abfd);
 293
 294   /* Align.  */
 295   if (recwr->size & 1)
 296     recwr->buf[recwr->size++] = 0;
 297
 298   /* Then the record.  */
 299   bfd_bwrite (recwr->buf, (size_t) recwr->size, abfd);
 300
 301   recwr->size = 0;
 302 }
 303
 304 /* Check remaining buffer size.  Return what's left.  */
 305
 306 int
 307 _bfd_vms_output_check (struct vms_rec_wr *recwr, int size)
 308 {
 309   vms_debug2 ((6, "_bfd_vms_output_check (%d)\n", size));
 310
 311   return (MAX_OUTREC_SIZE - (recwr->size + size + MIN_OUTREC_LUFT));
 312 }
 313
 314 /* Output byte (8 bit) value.  */
 315
 316 void
 317 _bfd_vms_output_byte (struct vms_rec_wr *recwr, unsigned int value)
 318 {
 319   vms_debug2 ((6, "_bfd_vms_output_byte (%02x)\n", value));
 320
 321   *(recwr->buf + recwr->size) = value;
 322   recwr->size += 1;
 323 }
 324
 325 /* Output short (16 bit) value.  */
 326
 327 void
 328 _bfd_vms_output_short (struct vms_rec_wr *recwr, unsigned int value)
 329 {
 330   vms_debug2 ((6, "_bfd_vms_output_short (%04x)\n", value));
 331
 332   bfd_putl16 ((bfd_vma) value & 0xffff, recwr->buf + recwr->size);
 333   recwr->size += 2;
 334 }
 335
 336 /* Output long (32 bit) value.  */
 337
 338 void
 339 _bfd_vms_output_long (struct vms_rec_wr *recwr, unsigned long value)
 340 {
 341   vms_debug2 ((6, "_bfd_vms_output_long (%08lx)\n", value));
 342
 343   bfd_putl32 ((bfd_vma) value, recwr->buf + recwr->size);
 344   recwr->size += 4;
 345 }
 346
 347 /* Output quad (64 bit) value.  */
 348
 349 void
 350 _bfd_vms_output_quad (struct vms_rec_wr *recwr, bfd_vma value)
 351 {
 352   vms_debug2 ((6, "_bfd_vms_output_quad (%08lx)\n", (unsigned long)value));
 353
 354   bfd_putl64 (value, recwr->buf + recwr->size);
 355   recwr->size += 8;
 356 }
 357
 358 /* Output c-string as counted string.  */
 359
 360 void
 361 _bfd_vms_output_counted (struct vms_rec_wr *recwr, const char *value)
 362 {
 363   int len;
 364
 365   vms_debug2 ((6, "_bfd_vms_output_counted (%s)\n", value));
 366
 367   len = strlen (value);
 368   if (len == 0)
 369     {
 370       _bfd_error_handler (_("_bfd_vms_output_counted called with zero bytes"));
 371       return;
 372     }
 373   if (len > 255)
 374     {
 375       _bfd_error_handler (_("_bfd_vms_output_counted called with too many bytes"));
 376       return;
 377     }
 378   _bfd_vms_output_byte (recwr, (unsigned int) len & 0xff);
 379   _bfd_vms_output_dump (recwr, (const unsigned char *)value, len);
 380 }
 381
 382 /* Output character area.  */
 383
 384 void
 385 _bfd_vms_output_dump (struct vms_rec_wr *recwr, const unsigned char *data, int len)
 386 {
 387   vms_debug2 ((6, "_bfd_vms_output_dump (%d)\n", len));
 388
 389   if (len == 0)
 390     return;
 391
 392   memcpy (recwr->buf + recwr->size, data, (size_t) len);
 393   recwr->size += len;
 394 }
 395
 396 /* Output count bytes of value.  */
 397
 398 void
 399 _bfd_vms_output_fill (struct vms_rec_wr *recwr, int value, int count)
 400 {
 401   vms_debug2 ((6, "_bfd_vms_output_fill (val %02x times %d)\n", value, count));
 402
 403   if (count == 0)
 404     return;
 405   memset (recwr->buf + recwr->size, value, (size_t) count);
 406   recwr->size += count;
 407 }
 408
 409 #ifdef VMS
 410 /* Convert the file to variable record length format. This is done
 411    using undocumented system call sys$modify().
 412    Pure VMS version.  */
 413
 414 static void
 415 vms_convert_to_var (char * vms_filename)
 416 {
 417   struct FAB fab = cc$rms_fab;
 418
 419   fab.fab$l_fna = vms_filename;
 420   fab.fab$b_fns = strlen (vms_filename);
 421   fab.fab$b_fac = FAB$M_PUT;
 422   fab.fab$l_fop = FAB$M_ESC;
 423   fab.fab$l_ctx = RME$C_SETRFM;
 424
 425   sys$open (&fab);
 426
 427   fab.fab$b_rfm = FAB$C_VAR;
 428
 429   sys$modify (&fab);
 430   sys$close (&fab);
 431 }
 432
 433 static int
 434 vms_convert_to_var_1 (char *filename, int type)
 435 {
 436   if (type != DECC$K_FILE)
 437     return false;
 438   vms_convert_to_var (filename);
 439   return true;
 440 }
 441
 442 /* Convert the file to variable record length format. This is done
 443    using undocumented system call sys$modify().
 444    Unix filename version.  */
 445
 446 int
 447 _bfd_vms_convert_to_var_unix_filename (const char *unix_filename)
 448 {
 449   if (decc$to_vms (unix_filename, &vms_convert_to_var_1, 0, 1) != 1)
 450     return false;
 451   return true;
 452 }
 453 #endif /* VMS */
 454
 455 /* Manufacture a VMS like time on a unix based system.
 456    stolen from obj-vms.c.  */
 457
 458 unsigned char *
 459 get_vms_time_string (unsigned char *tbuf)
 460 {
 461 #ifndef VMS
 462   char *pnt;
 463   time_t timeb;
 464
 465   time (& timeb);
 466   pnt = ctime (&timeb);
 467   pnt[3] = 0;
 468   pnt[7] = 0;
 469   pnt[10] = 0;
 470   pnt[16] = 0;
 471   pnt[24] = 0;
 472   sprintf ((char *) tbuf, "%2s-%3s-%s %s",
 473            pnt + 8, pnt + 4, pnt + 20, pnt + 11);
 474 #else
 475   struct
 476   {
 477     int Size;
 478     unsigned char *Ptr;
 479   } Descriptor;
 480   Descriptor.Size = 17;
 481   Descriptor.Ptr = tbuf;
 482   SYS$ASCTIM (0, &Descriptor, 0, 0);
 483 #endif /* not VMS */
 484
 485   vms_debug2 ((6, "vmstimestring:'%s'\n", tbuf));
 486
 487   return tbuf;
 488 }
 489
 490 /* Create module name from filename (ie, extract the basename and convert it
 491    in upper cases).  Works on both VMS and UNIX pathes.
 492    The result has to be free().  */
 493
 494 char *
 495 vms_get_module_name (const char *filename, bool upcase)
 496 {
 497   char *fname, *fptr;
 498   const char *fout;
 499
 500   /* Strip VMS path.  */
 501   fout = strrchr (filename, ']');
 502   if (fout == NULL)
 503     fout = strchr (filename, ':');
 504   if (fout != NULL)
 505     fout++;
 506   else
 507     fout = filename;
 508
 509   /* Strip UNIX path.  */
 510   fptr = strrchr (fout, '/');
 511   if (fptr != NULL)
 512     fout = fptr + 1;
 513
 514   fname = strdup (fout);
 515
 516   /* Strip suffix.  */
 517   fptr = strrchr (fname, '.');
 518   if (fptr != 0)
 519     *fptr = 0;
 520
 521   /* Convert to upper case and truncate at 31 characters.
 522      (VMS object file format restricts module name length to 31).  */
 523   fptr = fname;
 524   for (fptr = fname; *fptr != 0; fptr++)
 525     {
 526       if (*fptr == ';' || (fptr - fname) >= 31)
 527         {
 528           *fptr = 0;
 529           break;
 530         }
 531       if (upcase)
 532         *fptr = TOUPPER (*fptr);
 533     }
 534   return fname;
 535 }
 536
 537 /* Compared to usual UNIX time_t, VMS time has less limits:
 538    -  64 bit (63 bits in fact as the MSB must be 0)
 539    -  100ns granularity
 540    -  epoch is Nov 17, 1858.
 541    Here has the constants and the routines used to convert VMS from/to UNIX time.
 542    The conversion routines don't assume 64 bits arithmetic.
 543
 544    Here we assume that the definition of time_t is the UNIX one, ie integer
 545    type, expressing seconds since the epoch.  */
 546
 547 /* UNIX time granularity for VMS, ie 1s / 100ns.  */
 548 #define VMS_TIME_FACTOR 10000000
 549
 550 /* Number of seconds since VMS epoch of the UNIX epoch.  */
 551 #define VMS_TIME_OFFSET 3506716800U
 552
 553 /* Convert a VMS time to a unix time.  */
 554
 555 time_t
 556 vms_time_to_time_t (unsigned int hi, unsigned int lo)
 557 {
 558   unsigned int tmp;
 559   unsigned int rlo;
 560   int i;
 561   time_t res;
 562
 563   /* First convert to seconds.  */
 564   tmp = hi % VMS_TIME_FACTOR;
 565   hi = hi / VMS_TIME_FACTOR;
 566   rlo = 0;
 567   for (i = 0; i < 4; i++)
 568     {
 569       tmp = (tmp << 8) | (lo >> 24);
 570       lo <<= 8;
 571
 572       rlo = (rlo << 8) | (tmp / VMS_TIME_FACTOR);
 573       tmp %= VMS_TIME_FACTOR;
 574     }
 575   lo = rlo;
 576
 577   /* Return 0 in case of overflow.  */
 578   if (hi > 1
 579       || (hi == 1 && lo >= VMS_TIME_OFFSET))
 580     return 0;
 581
 582   /* Return 0 in case of underflow.  */
 583   if (hi == 0 && lo < VMS_TIME_OFFSET)
 584     return 0;
 585
 586   res = lo - VMS_TIME_OFFSET;
 587   if (res <= 0)
 588     return 0;
 589   return res;
 590 }
 591
 592 /* Convert a time_t to a VMS time.  */
 593
 594 void
 595 vms_time_t_to_vms_time (time_t ut, unsigned int *hi, unsigned int *lo)
 596 {
 597   unsigned int val[4];
 598   unsigned int tmp[4];
 599   unsigned int carry;
 600   int i;
 601
 602   /* Put into val.  */
 603   val[0] = ut & 0xffff;
 604   val[1] = (ut >> 16) & 0xffff;
 605   val[2] = sizeof (ut) > 4 ? (ut >> 32) & 0xffff : 0;
 606   val[3] = sizeof (ut) > 4 ? (ut >> 48) & 0xffff : 0;
 607
 608   /* Add offset.  */
 609   tmp[0] = VMS_TIME_OFFSET & 0xffff;
 610   tmp[1] = VMS_TIME_OFFSET >> 16;
 611   tmp[2] = 0;
 612   tmp[3] = 0;
 613   carry = 0;
 614   for (i = 0; i < 4; i++)
 615     {
 616       carry += tmp[i] + val[i];
 617       val[i] = carry & 0xffff;
 618       carry = carry >> 16;
 619     }
 620
 621   /* Multiply by factor, well first by 10000 and then by 1000.  */
 622   carry = 0;
 623   for (i = 0; i < 4; i++)
 624     {
 625       carry += val[i] * 10000;
 626       val[i] = carry & 0xffff;
 627       carry = carry >> 16;
 628     }
 629   carry = 0;
 630   for (i = 0; i < 4; i++)
 631     {
 632       carry += val[i] * 1000;
 633       val[i] = carry & 0xffff;
 634       carry = carry >> 16;
 635     }
 636
 637   /* Write the result.  */
 638   *lo = val[0] | (val[1] << 16);
 639   *hi = val[2] | (val[3] << 16);
 640 }
 641
 642 /* Convert a raw (stored in a buffer) VMS time to a unix time.  */
 643
 644 time_t
 645 vms_rawtime_to_time_t (unsigned char *buf)
 646 {
 647   unsigned int hi = bfd_getl32 (buf + 4);
 648   unsigned int lo = bfd_getl32 (buf + 0);
 649
 650   return vms_time_to_time_t (hi, lo);
 651 }
 652
 653 void
 654 vms_get_time (unsigned int *hi, unsigned int *lo)
 655 {
 656 #ifdef VMS
 657   struct _generic_64 t;
 658
 659   sys$gettim (&t);
 660   *lo = t.gen64$q_quadword;
 661   *hi = t.gen64$q_quadword >> 32;
 662 #else
 663   time_t t;
 664
 665   time (&t);
 666   vms_time_t_to_vms_time (t, hi, lo);
 667 #endif
 668 }
 669
 670 /* Get the current time into a raw buffer BUF.  */
 671
 672 void
 673 vms_raw_get_time (unsigned char *buf)
 674 {
 675   unsigned int hi, lo;
 676
 677   vms_get_time (&hi, &lo);
 678   bfd_putl32 (lo, buf + 0);
 679   bfd_putl32 (hi, buf + 4);
 680 }