output/outrdf2.c

   1 /* ----------------------------------------------------------------------- *
   2  *
   3  *   Copyright 1996-2009 The NASM Authors - All Rights Reserved
   4  *   See the file AUTHORS included with the NASM distribution for
   5  *   the specific copyright holders.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following
   9  *   conditions are met:
  10  *
  11  *   * Redistributions of source code must retain the above copyright
  12  *     notice, this list of conditions and the following disclaimer.
  13  *   * Redistributions in binary form must reproduce the above
  14  *     copyright notice, this list of conditions and the following
  15  *     disclaimer in the documentation and/or other materials provided
  16  *     with the distribution.
  17  *
  18  *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
  19  *     CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
  20  *     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  21  *     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  22  *     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  23  *     CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24  *     SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  25  *     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  26  *     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  *     HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  29  *     OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
  30  *     EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31  *
  32  * ----------------------------------------------------------------------- */
  33
  34 /*
  35  * outrdf2.c    output routines for the Netwide Assembler to produce
  36  *              RDOFF version 2 format object files, which Julian originally
  37  *              planned to use it in his MOSCOW operating system.
  38  */
  39
  40 #include "compiler.h"
  41
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44 #include <string.h>
  45 #include <ctype.h>
  46 #include <assert.h>
  47 #include <inttypes.h>
  48
  49 #include "nasm.h"
  50 #include "nasmlib.h"
  51 #include "saa.h"
  52 #include "output/outform.h"
  53 #include "output/outlib.h"
  54
  55 /* VERBOSE_WARNINGS: define this to add some extra warnings... */
  56 #define VERBOSE_WARNINGS
  57
  58 #ifdef OF_RDF2
  59
  60 #include "rdoff/rdoff.h"
  61
  62 /* This signature is written to start of RDOFF files */
  63 static const char *RDOFF2Id = RDOFF2_SIGNATURE;
  64
  65 /* Note that whenever a segment is referred to in the RDOFF file, its number
  66  * is always half of the segment number that NASM uses to refer to it; this
  67  * is because NASM only allocates even numbered segments, so as to not
  68  * waste any of the 16 bits of segment number written to the file - this
  69  * allows up to 65533 external labels to be defined; otherwise it would be
  70  * 32764. */
  71
  72 #define COUNT_SEGTYPES 9
  73
  74 static char *segmenttypes[COUNT_SEGTYPES] = {
  75     "null", "text", "code", "data",
  76     "comment", "lcomment", "pcomment",
  77     "symdebug", "linedebug"
  78 };
  79
  80 static int segmenttypenumbers[COUNT_SEGTYPES] = {
  81     0, 1, 1, 2, 3, 4, 5, 6, 7
  82 };
  83
  84 /* code for managing buffers needed to separate code and data into individual
  85  * sections until they are ready to be written to the file.
  86  * We'd better hope that it all fits in memory else we're buggered... */
  87
  88 #define BUF_BLOCK_LEN 4088      /* selected to match page size (4096)
  89                                  * on 80x86 machines for efficiency */
  90
  91 /***********************************************************************
  92  * Actual code to deal with RDOFF2 ouput format begins here...
  93  */
  94
  95 /* global variables set during the initialisation phase */
  96
  97 static struct SAA *seg[RDF_MAXSEGS];    /* seg 0 = code, seg 1 = data */
  98 static struct SAA *header;      /* relocation/import/export records */
  99
 100 static struct seginfo {
 101     char *segname;
 102     int segnumber;
 103     uint16_t segtype;
 104     uint16_t segreserved;
 105     int32_t seglength;
 106 } segments[RDF_MAXSEGS];
 107
 108 static int nsegments;
 109
 110 static int32_t bsslength;
 111 static int32_t headerlength;
 112
 113 static void rdf2_init(void)
 114 {
 115     int segtext, segdata, segbss;
 116
 117     maxbits = 64;
 118
 119     /* set up the initial segments */
 120     segments[0].segname = ".text";
 121     segments[0].segnumber = 0;
 122     segments[0].segtype = 1;
 123     segments[0].segreserved = 0;
 124     segments[0].seglength = 0;
 125
 126     segments[1].segname = ".data";
 127     segments[1].segnumber = 1;
 128     segments[1].segtype = 2;
 129     segments[1].segreserved = 0;
 130     segments[1].seglength = 0;
 131
 132     segments[2].segname = ".bss";
 133     segments[2].segnumber = 2;
 134     segments[2].segtype = 0xFFFF;       /* reserved - should never be produced */
 135     segments[2].segreserved = 0;
 136     segments[2].seglength = 0;
 137
 138     nsegments = 3;
 139
 140     seg[0] = saa_init(1L);
 141     seg[1] = saa_init(1L);
 142     seg[2] = NULL;              /* special case! */
 143
 144     header = saa_init(1L);
 145
 146     segtext = seg_alloc();
 147     segdata = seg_alloc();
 148     segbss = seg_alloc();
 149     if (segtext != 0 || segdata != 2 || segbss != 4)
 150         nasm_error(ERR_PANIC,
 151               "rdf segment numbers not allocated as expected (%d,%d,%d)",
 152               segtext, segdata, segbss);
 153     bsslength = 0;
 154     headerlength = 0;
 155 }
 156
 157 static int32_t rdf2_section_names(char *name, int pass, int *bits)
 158 {
 159     int i;
 160     bool err;
 161     char *p, *q;
 162     int code = -1;
 163     int reserved = 0;
 164
 165     (void)pass;
 166
 167     /*
 168      * Default is 32 bits, in the text segment.
 169      */
 170     if (!name) {
 171         *bits = 32;
 172         return 0;
 173     }
 174
 175     /* look for segment type code following segment name */
 176     p = name;
 177     while (*p && !nasm_isspace(*p))
 178         p++;
 179     if (*p) {                   /* we're now in whitespace */
 180         *p++ = '\0';
 181         while (*p && nasm_isspace(80))
 182             *p++ = '\0';
 183     }
 184     if (*p) {                   /* we're now in an attribute value */
 185         /*
 186          * see if we have an optional ',number' following the type code
 187          */
 188         if ((q = strchr(p, ','))) {
 189             *q++ = '\0';
 190
 191             reserved = readnum(q, &err);
 192             if (err) {
 193                 nasm_error(ERR_NONFATAL,
 194                       "value following comma must be numeric");
 195                 reserved = 0;
 196             }
 197         }
 198         /*
 199          * check it against the text strings in segmenttypes
 200          */
 201
 202         for (i = 0; i < COUNT_SEGTYPES; i++)
 203             if (!nasm_stricmp(p, segmenttypes[i])) {
 204                 code = segmenttypenumbers[i];
 205                 break;
 206             }
 207         if (code == -1) {       /* didn't find anything */
 208             code = readnum(p, &err);
 209             if (err) {
 210                 nasm_error(ERR_NONFATAL, "unrecognised RDF segment type (%s)",
 211                       p);
 212                 code = 3;
 213             }
 214         }
 215     }
 216     for (i = 0; i < nsegments; i++) {
 217         if (!strcmp(name, segments[i].segname)) {
 218             if (code != -1 || reserved != 0)
 219                 nasm_error(ERR_NONFATAL, "segment attributes specified on"
 220                       " redeclaration of segment");
 221             return segments[i].segnumber * 2;
 222         }
 223     }
 224
 225     /* declaring a new segment! */
 226
 227     if (code == -1) {
 228         nasm_error(ERR_NONFATAL, "new segment declared without type code");
 229         code = 3;
 230     }
 231     if (nsegments == RDF_MAXSEGS) {
 232         nasm_error(ERR_FATAL, "reached compiled-in maximum segment limit (%d)",
 233               RDF_MAXSEGS);
 234         return NO_SEG;
 235     }
 236
 237     segments[nsegments].segname = nasm_strdup(name);
 238     i = seg_alloc();
 239     if (i % 2 != 0)
 240         nasm_error(ERR_PANIC, "seg_alloc() returned odd number");
 241     segments[nsegments].segnumber = i >> 1;
 242     segments[nsegments].segtype = code;
 243     segments[nsegments].segreserved = reserved;
 244     segments[nsegments].seglength = 0;
 245
 246     seg[nsegments] = saa_init(1L);
 247
 248     return i;
 249 }
 250
 251 /*
 252  * Write relocation record
 253  */
 254 static void write_reloc_rec(struct RelocRec *r)
 255 {
 256     char buf[4], *b;
 257
 258     if (r->refseg != (uint16_t) NO_SEG && (r->refseg & 1))        /* segment base ref */
 259         r->type = RDFREC_SEGRELOC;
 260
 261     r->refseg >>= 1;            /* adjust segment nos to RDF rather than NASM */
 262
 263     saa_wbytes(header, &r->type, 1);
 264     saa_wbytes(header, &r->reclen, 1);
 265     saa_wbytes(header, &r->segment, 1);
 266     b = buf;
 267     WRITELONG(b, r->offset);
 268     saa_wbytes(header, buf, 4);
 269     saa_wbytes(header, &r->length, 1);
 270     b = buf;
 271     WRITESHORT(b, r->refseg);
 272     saa_wbytes(header, buf, 2);
 273     headerlength += r->reclen + 2;
 274 }
 275
 276 /*
 277  * Write export record
 278  */
 279 static void write_export_rec(struct ExportRec *r)
 280 {
 281     char buf[4], *b;
 282
 283     r->segment >>= 1;
 284
 285     saa_wbytes(header, &r->type, 1);
 286     saa_wbytes(header, &r->reclen, 1);
 287     saa_wbytes(header, &r->flags, 1);
 288     saa_wbytes(header, &r->segment, 1);
 289     b = buf;
 290     WRITELONG(b, r->offset);
 291     saa_wbytes(header, buf, 4);
 292     saa_wbytes(header, r->label, strlen(r->label) + 1);
 293     headerlength += r->reclen + 2;
 294 }
 295
 296 static void write_import_rec(struct ImportRec *r)
 297 {
 298     char buf[4], *b;
 299
 300     r->segment >>= 1;
 301
 302     saa_wbytes(header, &r->type, 1);
 303     saa_wbytes(header, &r->reclen, 1);
 304     saa_wbytes(header, &r->flags, 1);
 305     b = buf;
 306     WRITESHORT(b, r->segment);
 307     saa_wbytes(header, buf, 2);
 308     saa_wbytes(header, r->label, strlen(r->label) + 1);
 309     headerlength += r->reclen + 2;
 310 }
 311
 312 /*
 313  * Write BSS record
 314  */
 315 static void write_bss_rec(struct BSSRec *r)
 316 {
 317     char buf[4], *b;
 318
 319     saa_wbytes(header, &r->type, 1);
 320     saa_wbytes(header, &r->reclen, 1);
 321     b = buf;
 322     WRITELONG(b, r->amount);
 323     saa_wbytes(header, buf, 4);
 324     headerlength += r->reclen + 2;
 325 }
 326
 327 /*
 328  * Write common variable record
 329  */
 330 static void write_common_rec(struct CommonRec *r)
 331 {
 332     char buf[4], *b;
 333
 334     r->segment >>= 1;
 335
 336     saa_wbytes(header, &r->type, 1);
 337     saa_wbytes(header, &r->reclen, 1);
 338     b = buf;
 339     WRITESHORT(b, r->segment);
 340     saa_wbytes(header, buf, 2);
 341     b = buf;
 342     WRITELONG(b, r->size);
 343     saa_wbytes(header, buf, 4);
 344     b = buf;
 345     WRITESHORT(b, r->align);
 346     saa_wbytes(header, buf, 2);
 347     saa_wbytes(header, r->label, strlen(r->label) + 1);
 348     headerlength += r->reclen + 2;
 349 }
 350
 351 /*
 352  * Write library record
 353  */
 354 static void write_dll_rec(struct DLLRec *r)
 355 {
 356     saa_wbytes(header, &r->type, 1);
 357     saa_wbytes(header, &r->reclen, 1);
 358     saa_wbytes(header, r->libname, strlen(r->libname) + 1);
 359     headerlength += r->reclen + 2;
 360 }
 361
 362 /*
 363  * Write module name record
 364  */
 365 static void write_modname_rec(struct ModRec *r)
 366 {
 367     saa_wbytes(header, &r->type, 1);
 368     saa_wbytes(header, &r->reclen, 1);
 369     saa_wbytes(header, r->modname, strlen(r->modname) + 1);
 370     headerlength += r->reclen + 2;
 371 }
 372
 373 /*
 374  * Handle export, import and common records.
 375  */
 376 static void rdf2_deflabel(char *name, int32_t segment, int64_t offset,
 377                           int is_global, char *special)
 378 {
 379     struct ExportRec r;
 380     struct ImportRec ri;
 381     struct CommonRec ci;
 382     static int farsym = 0;
 383     static int i;
 384     char symflags = 0;
 385     int len;
 386
 387     /* Check if the label length is OK */
 388     if ((len = strlen(name)) >= EXIM_LABEL_MAX) {
 389         nasm_error(ERR_NONFATAL, "label size exceeds %d bytes", EXIM_LABEL_MAX);
 390         return;
 391     }
 392     if (!len) {
 393         nasm_error(ERR_NONFATAL, "zero-length label");
 394         return;
 395     }
 396
 397     if (is_global == 2) {
 398         /* Common variable */
 399         ci.type = RDFREC_COMMON;
 400         ci.size = offset;
 401         ci.segment = segment;
 402         strcpy(ci.label, name);
 403         ci.reclen = 9 + len;
 404         ci.align = 0;
 405
 406         /*
 407          * Check the special text to see if it's a valid number and power
 408          * of two; if so, store it as the alignment for the common variable.
 409          */
 410         if (special) {
 411             bool err;
 412             ci.align = readnum(special, &err);
 413             if (err)
 414                 nasm_error(ERR_NONFATAL, "alignment constraint `%s' is not a"
 415                       " valid number", special);
 416             else if ((ci.align | (ci.align - 1)) != 2 * ci.align - 1)
 417                 nasm_error(ERR_NONFATAL, "alignment constraint `%s' is not a"
 418                       " power of two", special);
 419         }
 420         write_common_rec(&ci);
 421     }
 422
 423     /* We don't care about local labels or fix-up hints */
 424     if (is_global != 1)
 425         return;
 426
 427     if (special) {
 428         while (*special == ' ' || *special == '\t')
 429             special++;
 430
 431         if (!nasm_strnicmp(special, "export", 6)) {
 432             special += 6;
 433             symflags |= SYM_GLOBAL;
 434         } else if (!nasm_strnicmp(special, "import", 6)) {
 435             special += 6;
 436             symflags |= SYM_IMPORT;
 437         }
 438
 439         if (*special) {
 440             while (nasm_isspace(*special))
 441                 special++;
 442             if (!nasm_stricmp(special, "far")) {
 443                 farsym = 1;
 444             } else if (!nasm_stricmp(special, "near")) {
 445                 farsym = 0;
 446             } else if (!nasm_stricmp(special, "proc") ||
 447                        !nasm_stricmp(special, "function")) {
 448                 symflags |= SYM_FUNCTION;
 449             } else if (!nasm_stricmp(special, "data") ||
 450                        !nasm_stricmp(special, "object")) {
 451                 symflags |= SYM_DATA;
 452             } else
 453                 nasm_error(ERR_NONFATAL, "unrecognised symbol type `%s'",
 454                       special);
 455         }
 456     }
 457
 458     if (name[0] == '.' && name[1] == '.' && name[2] != '@') {
 459         nasm_error(ERR_NONFATAL, "unrecognised special symbol `%s'", name);
 460         return;
 461     }
 462
 463     for (i = 0; i < nsegments; i++) {
 464         if (segments[i].segnumber == segment >> 1)
 465             break;
 466     }
 467
 468     if (i >= nsegments) {       /* EXTERN declaration */
 469         ri.type = farsym ? RDFREC_FARIMPORT : RDFREC_IMPORT;
 470         if (symflags & SYM_GLOBAL)
 471             nasm_error(ERR_NONFATAL,
 472                   "symbol type conflict - EXTERN cannot be EXPORT");
 473         ri.flags = symflags;
 474         ri.segment = segment;
 475         strcpy(ri.label, name);
 476         ri.reclen = 4 + len;
 477         write_import_rec(&ri);
 478     } else if (is_global) {
 479         r.type = RDFREC_GLOBAL; /* GLOBAL declaration */
 480         if (symflags & SYM_IMPORT)
 481             nasm_error(ERR_NONFATAL,
 482                   "symbol type conflict - GLOBAL cannot be IMPORT");
 483         r.flags = symflags;
 484         r.segment = segment;
 485         r.offset = offset;
 486         strcpy(r.label, name);
 487         r.reclen = 7 + len;
 488         write_export_rec(&r);
 489     }
 490 }
 491
 492 static void membufwrite(int segment, const void *data, int bytes)
 493 {
 494     int i;
 495     char buf[4], *b;
 496
 497     for (i = 0; i < nsegments; i++) {
 498         if (segments[i].segnumber == segment)
 499             break;
 500     }
 501     if (i == nsegments)
 502         nasm_error(ERR_PANIC, "can't find segment %d", segment);
 503
 504     if (bytes < 0) {
 505         b = buf;
 506         if (bytes == -2)
 507             WRITESHORT(b, *(int16_t *)data);
 508         else
 509             WRITELONG(b, *(int32_t *)data);
 510         data = buf;
 511         bytes = -bytes;
 512     }
 513     segments[i].seglength += bytes;
 514     saa_wbytes(seg[i], data, bytes);
 515 }
 516
 517 static int getsegmentlength(int segment)
 518 {
 519     int i;
 520     for (i = 0; i < nsegments; i++) {
 521         if (segments[i].segnumber == segment)
 522             break;
 523     }
 524     if (i == nsegments)
 525         nasm_error(ERR_PANIC, "can't find segment %d", segment);
 526
 527     return segments[i].seglength;
 528 }
 529
 530 static void rdf2_out(int32_t segto, const void *data,
 531                      enum out_type type, uint64_t size,
 532                      int32_t segment, int32_t wrt)
 533 {
 534     struct RelocRec rr;
 535     uint8_t databuf[8], *pd;
 536     int seg;
 537
 538     if (segto == NO_SEG) {
 539         if (type != OUT_RESERVE)
 540             nasm_error(ERR_NONFATAL,
 541                   "attempt to assemble code in ABSOLUTE space");
 542         return;
 543     }
 544
 545     segto >>= 1;                /* convert NASM segment no to RDF number */
 546
 547     for (seg = 0; seg < nsegments; seg++) {
 548         if (segments[seg].segnumber == segto)
 549             break;
 550     }
 551     if (seg >= nsegments) {
 552         nasm_error(ERR_NONFATAL,
 553               "specified segment not supported by rdf output format");
 554         return;
 555     }
 556
 557     if (wrt != NO_SEG) {
 558         wrt = NO_SEG;           /* continue to do _something_ */
 559         nasm_error(ERR_NONFATAL, "WRT not supported by rdf output format");
 560     }
 561
 562     if (segto == 2 && type != OUT_RESERVE) {
 563         nasm_error(ERR_NONFATAL, "BSS segments may not be initialized");
 564
 565         /* just reserve the space for now... */
 566
 567         if (type == OUT_REL2ADR)
 568             size = 2;
 569         else
 570             size = 4;
 571         type = OUT_RESERVE;
 572     }
 573
 574     if (type == OUT_RESERVE) {
 575         if (segto == 2)         /* BSS segment space reserverd */
 576             bsslength += size;
 577         else
 578             while (size--)
 579                 membufwrite(segto, databuf, 1);
 580     } else if (type == OUT_RAWDATA) {
 581         if (segment != NO_SEG)
 582             nasm_error(ERR_PANIC, "OUT_RAWDATA with other than NO_SEG");
 583
 584         membufwrite(segto, data, size);
 585     } else if (type == OUT_ADDRESS) {
 586
 587         /* if segment == NO_SEG then we are writing an address of an
 588            object within the same segment - do not produce reloc rec. */
 589
 590         /* FIXME - is this behaviour sane? at first glance it doesn't
 591            appear to be. Must test this thoroughly...! */
 592
 593         if (segment != NO_SEG) {
 594             /* it's an address, so we must write a relocation record */
 595
 596             rr.type = RDFREC_RELOC;     /* type signature */
 597             rr.reclen = 8;
 598             rr.segment = segto; /* segment we're currently in */
 599             rr.offset = getsegmentlength(segto);        /* current offset */
 600             rr.length = size;  /* length of reference */
 601             rr.refseg = segment;        /* segment referred to */
 602             write_reloc_rec(&rr);
 603         }
 604
 605         pd = databuf;           /* convert address to little-endian */
 606         WRITEADDR(pd, *(int64_t *)data, size);
 607         membufwrite(segto, databuf, size);
 608     } else if (type == OUT_REL2ADR) {
 609         if (segment == segto)
 610             nasm_error(ERR_PANIC, "intra-segment OUT_REL2ADR");
 611
 612         rr.reclen = 8;
 613         rr.offset = getsegmentlength(segto);    /* current offset */
 614         rr.length = 2;          /* length of reference */
 615         rr.refseg = segment;    /* segment referred to (will be >>1'd) */
 616
 617         if (segment != NO_SEG && segment % 2) {
 618             rr.type = RDFREC_SEGRELOC;
 619             rr.segment = segto; /* memory base refs *aren't ever* relative! */
 620             write_reloc_rec(&rr);
 621
 622             /* what do we put in the code? Simply the data. This should almost
 623              * always be zero, unless someone's doing segment arithmetic...
 624              */
 625             rr.offset = *(int64_t *)data;
 626         } else {
 627             rr.type = RDFREC_RELOC;     /* type signature */
 628             rr.segment = segto + 64;    /* segment we're currently in + rel flag */
 629             write_reloc_rec(&rr);
 630
 631             /* work out what to put in the code: offset of the end of this operand,
 632              * subtracted from any data specified, so that loader can just add
 633              * address of imported symbol onto it to get address relative to end of
 634              * instruction: import_address + data(offset) - end_of_instrn */
 635
 636             rr.offset = *(int32_t *)data - (rr.offset + size);
 637         }
 638
 639         membufwrite(segto, &rr.offset, -2);
 640     } else if (type == OUT_REL4ADR) {
 641         if ((segment == segto) && (globalbits != 64))
 642             nasm_error(ERR_PANIC, "intra-segment OUT_REL4ADR");
 643         if (segment != NO_SEG && segment % 2) {
 644             nasm_error(ERR_PANIC, "erm... 4 byte segment base ref?");
 645         }
 646
 647         rr.type = RDFREC_RELOC; /* type signature */
 648         rr.segment = segto + 64;        /* segment we're currently in + rel tag */
 649         rr.offset = getsegmentlength(segto);    /* current offset */
 650         rr.length = 4;          /* length of reference */
 651         rr.refseg = segment;    /* segment referred to */
 652         rr.reclen = 8;
 653         write_reloc_rec(&rr);
 654
 655         rr.offset = *(int64_t *)data - (rr.offset + size);
 656
 657         membufwrite(segto, &rr.offset, -4);
 658     }
 659 }
 660
 661 static void rdf2_cleanup(int debuginfo)
 662 {
 663     int32_t l;
 664     struct BSSRec bs;
 665     int i;
 666
 667     (void)debuginfo;
 668
 669     /* should write imported & exported symbol declarations to header here */
 670
 671     /* generate the output file... */
 672     fwrite(RDOFF2Id, 6, 1, ofile);      /* file type magic number */
 673
 674     if (bsslength != 0) {       /* reserve BSS */
 675         bs.type = RDFREC_BSS;
 676         bs.amount = bsslength;
 677         bs.reclen = 4;
 678         write_bss_rec(&bs);
 679     }
 680
 681     /*
 682      * calculate overall length of the output object
 683      */
 684     l = headerlength + 4;
 685
 686     for (i = 0; i < nsegments; i++) {
 687         if (i == 2)
 688             continue;           /* skip BSS segment */
 689         l += 10 + segments[i].seglength;
 690     }
 691     l += 10;                    /* null segment */
 692
 693     fwriteint32_t(l, ofile);
 694
 695     fwriteint32_t(headerlength, ofile);
 696     saa_fpwrite(header, ofile); /* dump header */
 697     saa_free(header);
 698
 699     for (i = 0; i < nsegments; i++) {
 700         if (i == 2)
 701             continue;
 702
 703         fwriteint16_t(segments[i].segtype, ofile);
 704         fwriteint16_t(segments[i].segnumber, ofile);
 705         fwriteint16_t(segments[i].segreserved, ofile);
 706         fwriteint32_t(segments[i].seglength, ofile);
 707
 708         saa_fpwrite(seg[i], ofile);
 709         saa_free(seg[i]);
 710     }
 711
 712     /* null segment - write 10 bytes of zero */
 713     fwriteint32_t(0, ofile);
 714     fwriteint32_t(0, ofile);
 715     fwriteint16_t(0, ofile);
 716 }
 717
 718 static int32_t rdf2_segbase(int32_t segment)
 719 {
 720     return segment;
 721 }
 722
 723 /*
 724  * Handle RDOFF2 specific directives
 725  */
 726 static int rdf2_directive(enum directives directive, char *value, int pass)
 727 {
 728     size_t n;
 729
 730     switch (directive) {
 731     case D_LIBRARY:
 732         n = strlen(value);
 733         if (n >= MODLIB_NAME_MAX) {
 734             nasm_error(ERR_NONFATAL, "name size exceeds %d bytes", MODLIB_NAME_MAX);
 735             return 1;
 736         }
 737         if (pass == 1) {
 738             struct DLLRec r;
 739             r.type = RDFREC_DLL;
 740             r.reclen = n + 1;
 741             strcpy(r.libname, value);
 742             write_dll_rec(&r);
 743         }
 744         return 1;
 745
 746     case D_MODULE:
 747         if ((n = strlen(value)) >= MODLIB_NAME_MAX) {
 748             nasm_error(ERR_NONFATAL, "name size exceeds %d bytes", MODLIB_NAME_MAX);
 749             return 1;
 750         }
 751         if (pass == 1) {
 752             struct ModRec r;
 753             r.type = RDFREC_MODNAME;
 754             r.reclen = n + 1;
 755             strcpy(r.modname, value);
 756             write_modname_rec(&r);
 757         }
 758         return 1;
 759
 760     default:
 761         return 0;
 762     }
 763 }
 764
 765 static void rdf2_filename(char *inname, char *outname)
 766 {
 767     standard_extension(inname, outname, ".rdf");
 768 }
 769
 770 extern macros_t rdf2_stdmac[];
 771
 772 static int rdf2_set_info(enum geninfo type, char **val)
 773 {
 774     (void)type;
 775     (void)val;
 776     return 0;
 777 }
 778
 779 struct ofmt of_rdf2 = {
 780     "Relocatable Dynamic Object File Format v2.0",
 781     "rdf",
 782     0,
 783     null_debug_arr,
 784     &null_debug_form,
 785     rdf2_stdmac,
 786     rdf2_init,
 787     rdf2_set_info,
 788     rdf2_out,
 789     rdf2_deflabel,
 790     rdf2_section_names,
 791     rdf2_segbase,
 792     rdf2_directive,
 793     rdf2_filename,
 794     rdf2_cleanup
 795 };
 796
 797 #endif                          /* OF_RDF2 */