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outieee.c

/* outieee.c      output routines for the Netwide Assembler to produce
 *          IEEE-std object files
 *
 * The Netwide Assembler is copyright (C) 1996 Simon Tatham and
 * Julian Hall. All rights reserved. The software is
 * redistributable under the licence given in the file "Licence"
 * distributed in the NASM archive.
 */

/* notes: I have tried to make this correspond to the IEEE version
 * of the standard, specifically the primary ASCII version.  It should
 * be trivial to create the binary version given this source (which is
 * one of MANY things that have to be done to make this correspond to
 * the hp-microtek version of the standard).
 *
 * 16-bit support is assumed to use 24-bit addresses
 * The linker can sort out segmentation-specific stuff
 * if it keeps track of externals
 * in terms of being relative to section bases
 *
 * A non-standard variable type, the 'Yn' variable, has been introduced.
 * Basically it is a reference to extern 'n'- denoting the low limit
 * (L-variable) of the section that extern 'n' is defined in.  Like the
 * x variable, there may be no explicit assignment to it, it is derived
 * from the public definition corresponding to the extern name.  This
 * is required because the one thing the mufom guys forgot to do well was
 * take into account segmented architectures.
 *
 * I use comment classes for various things and these are undefined by
 * the standard.
 *
 * Debug info should be considered totally non-standard (local labels are
 * standard but linenum records are not covered by the standard.
 * Type defs have the standard format but absolute meanings for ordinal
 * types are not covered by the standard.)
 *
 * David Lindauer, LADsoft
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <stdarg.h>  /* Note: we need the ANSI version of stdarg.h */
#include <ctype.h>

#include "nasm.h"
#include "nasmlib.h"
#include "outform.h"

#ifdef OF_IEEE

#define ARRAY_BOT 0x1

static char ieee_infile[FILENAME_MAX];
static int ieee_uppercase;

static efunc error;
static ldfunc deflabel;
static FILE *ofp;
static int any_segs;
static int arrindex;

#define HUNKSIZE 1024                /* Size of the data hunk */
#define EXT_BLKSIZ 512
#define LDPERLINE 32                /* bytes per line in output */

struct ieeeSection;

struct LineNumber {
    struct LineNumber *next;
    struct ieeeSection *segment;
    long offset;
    long lineno;
};

static struct FileName {
    struct FileName *next;
    char *name;
    long index;
} *fnhead, **fntail;

static struct Array {
    struct Array *next;
    unsigned size;
    int basetype;
} *arrhead, **arrtail;

static struct ieeePublic {
    struct ieeePublic *next;
    char *name;
    long offset;
    long segment;              /* only if it's far-absolute */
    long index;
    int type;                       /* for debug purposes */      
} *fpubhead, **fpubtail, *last_defined;

static struct ieeeExternal {
    struct ieeeExternal *next;
    char *name;
    long commonsize;
} *exthead, **exttail;

static int externals;

static struct ExtBack {
    struct ExtBack *next;
    int index[EXT_BLKSIZ];
} *ebhead, **ebtail;

/* NOTE: the first segment MUST be the lineno segment */
static struct ieeeSection {
    struct ieeeObjData *data,*datacurr;
    struct ieeeSection *next;
    struct ieeeFixupp *fptr, * flptr;
    long index;                      /* the NASM segment id */
    long ieee_index;                 /* the OBJ-file segment index */
    long currentpos;
    long align;                      /* can be SEG_ABS + absolute addr */
    long startpos;
    enum {
      CMB_PRIVATE = 0,
      CMB_PUBLIC = 2,
      CMB_COMMON = 6
    } combine;
    long use32;                      /* is this segment 32-bit? */
    struct ieeePublic *pubhead, **pubtail, *lochead, **loctail;
    char *name;
} *seghead, **segtail, *ieee_seg_needs_update;

struct ieeeObjData {
    struct ieeeObjData *next;
    unsigned char data[HUNKSIZE];
};

struct ieeeFixupp {
    struct ieeeFixupp *next;
    enum { 
      FT_SEG = 0,
      FT_REL = 1,
      FT_OFS = 2,
      FT_EXT = 3,
      FT_WRT = 4,
      FT_EXTREL = 5,
      FT_EXTWRT = 6,
      FT_EXTSEG = 7
    } ftype;
    short size;
    long id1;
    long id2;
    long offset;
    long addend;
};
            
static long ieee_entry_seg, ieee_entry_ofs;
static int checksum;

extern struct ofmt of_ieee;

static void ieee_data_new(struct ieeeSection *);
static void ieee_write_fixup (long, long, struct ieeeSection *,
                        int, unsigned long, long);
static void ieee_install_fixup(struct ieeeSection *, struct ieeeFixupp *);
static long ieee_segment (char *, int, int *);
static void ieee_write_file(int debuginfo);
static void ieee_write_byte(struct ieeeSection *, int);
static void ieee_write_word(struct ieeeSection *, int);
static void ieee_write_dword(struct ieeeSection *, long);
static void ieee_putascii(char *, ...);
static void ieee_putcs(int);
static long ieee_putld(long, long, unsigned char *);
static long ieee_putlr(struct ieeeFixupp *);
static void ieee_unqualified_name(char *, char *);


/* 
 * pup init 
 */
static void ieee_init (FILE *fp, efunc errfunc, ldfunc ldef, evalfunc eval) 
{
    (void) eval;
    ofp = fp;
    error = errfunc;
    deflabel = ldef;
    any_segs = FALSE;
    fpubhead = NULL;
    fpubtail = &fpubhead;
    exthead = NULL;
    exttail = &exthead;
    externals = 1;
    ebhead = NULL;
    ebtail = &ebhead;
    seghead = ieee_seg_needs_update = NULL;
    segtail = &seghead;
    ieee_entry_seg = NO_SEG;
    ieee_uppercase = FALSE;
    checksum = 0;
    of_ieee.current_dfmt->init (&of_ieee,NULL,fp,errfunc);
}
static int ieee_set_info(enum geninfo type, char **val)
{
    (void) type;
    (void) val;

    return 0;
}
/*
 * Rundown
 */
static void ieee_cleanup (int debuginfo) 
{
    ieee_write_file(debuginfo);
    of_ieee.current_dfmt->cleanup ();
    fclose (ofp);
    while (seghead) {
      struct ieeeSection *segtmp = seghead;
      seghead = seghead->next;
      while (segtmp->pubhead) {
          struct ieeePublic *pubtmp = segtmp->pubhead;
          segtmp->pubhead = pubtmp->next;
          nasm_free (pubtmp);
      }
      while (segtmp->fptr) {
          struct ieeeFixupp *fixtmp = segtmp->fptr;
          segtmp->fptr = fixtmp->next;
          nasm_free(fixtmp);
      }
      while (segtmp->data) {
          struct ieeeObjData *dattmp = segtmp->data;
          segtmp->data = dattmp->next;
          nasm_free(dattmp);
      }
      nasm_free (segtmp);
    }
    while (fpubhead) {
      struct ieeePublic *pubtmp = fpubhead;
      fpubhead = fpubhead->next;
      nasm_free (pubtmp);
    }
    while (exthead) {
      struct ieeeExternal *exttmp = exthead;
      exthead = exthead->next;
      nasm_free (exttmp);
    }
    while (ebhead) {
      struct ExtBack *ebtmp = ebhead;
      ebhead = ebhead->next;
      nasm_free (ebtmp);
    }
}
/*
 * callback for labels
 */
static void ieee_deflabel (char *name, long segment,
                    long offset, int is_global, char *special) {
    /*
     * We have three cases:
     *
     * (i) `segment' is a segment-base. If so, set the name field
     * for the segment structure it refers to, and then
     * return.
     *
     * (ii) `segment' is one of our segments, or a SEG_ABS segment.
     * Save the label position for later output of a PUBDEF record.
     * 
     *
     * (iii) `segment' is not one of our segments. Save the label
     * position for later output of an EXTDEF.
     */
    struct ieeeExternal *ext;
    struct ExtBack *eb;
    struct ieeeSection *seg;
    int i;

    if (special) {
        error(ERR_NONFATAL, "unrecognised symbol type `%s'", special);
    }
    /*
     * First check for the double-period, signifying something
     * unusual.
     */
    if (name[0] == '.' && name[1] == '.') {
      if (!strcmp(name, "..start")) {
          ieee_entry_seg = segment;
          ieee_entry_ofs = offset;
      }
      return;
    }

    /*
     * Case (i):
     */
    if (ieee_seg_needs_update) {
      ieee_seg_needs_update->name = name;
      return;
    } 
    if (segment < SEG_ABS && segment != NO_SEG && segment % 2)
      return;

    /*
     * case (ii)
     */
    if (segment >= SEG_ABS) {
      /*
       * SEG_ABS subcase of (ii).
       */
      if (is_global) {
          struct ieeePublic *pub;

          pub = *fpubtail = nasm_malloc(sizeof(*pub));
          fpubtail = &pub->next;
          pub->next = NULL;
          pub->name = name;
          pub->offset = offset;
          pub->segment = segment & ~SEG_ABS;
      }
      return;
    }

    for (seg = seghead; seg && is_global; seg = seg->next)
      if (seg->index == segment) {
            struct ieeePublic *pub;

          last_defined = pub = *seg->pubtail = nasm_malloc(sizeof(*pub));
          seg->pubtail = &pub->next;
          pub->next = NULL;
          pub->name = name;
          pub->offset = offset;
          pub->index = seg->ieee_index;
          pub->segment = -1;
          return;
      }

    /*
     * Case (iii).
     */
    if (is_global) {
        ext = *exttail = nasm_malloc(sizeof(*ext));
        ext->next = NULL;
        exttail = &ext->next;
        ext->name = name;
        if (is_global == 2)
          ext->commonsize = offset;
      else
          ext->commonsize = 0;
      i = segment/2;
      eb = ebhead;
      if (!eb) {
          eb = *ebtail = nasm_malloc(sizeof(*eb));
          eb->next = NULL;
          ebtail = &eb->next;
        }
      while (i > EXT_BLKSIZ) {
          if (eb && eb->next)
              eb = eb->next;
          else {
              eb = *ebtail = nasm_malloc(sizeof(*eb));
            eb->next = NULL;
            ebtail = &eb->next;
          }
          i -= EXT_BLKSIZ;
      }
        eb->index[i] = externals++;
    }
      
}

/*
 * Put data out
 */
static void ieee_out (long segto, const void *data, unsigned long type,
                 long segment, long wrt) {
    unsigned long size, realtype;
    const unsigned char *ucdata;
    long ldata;
    struct ieeeSection *seg;

    /*
     * handle absolute-assembly (structure definitions)
     */
    if (segto == NO_SEG) {
      if ((type & OUT_TYPMASK) != OUT_RESERVE)
          error (ERR_NONFATAL, "attempt to assemble code in [ABSOLUTE]"
               " space");
      return;
    }

    /*
     * If `any_segs' is still FALSE, we must define a default
     * segment.
     */
    if (!any_segs) {
      int tempint;                   /* ignored */
      if (segto != ieee_segment("__NASMDEFSEG", 2, &tempint))
          error (ERR_PANIC, "strange segment conditions in IEEE driver");
    }

    /*
     * Find the segment we are targetting.
     */
    for (seg = seghead; seg; seg = seg->next)
      if (seg->index == segto)
          break;
    if (!seg)
      error (ERR_PANIC, "code directed to nonexistent segment?");

    size = type & OUT_SIZMASK;
    realtype = type & OUT_TYPMASK;
    if (realtype == OUT_RAWDATA) {
      ucdata = data;
      while (size--)
          ieee_write_byte(seg,*ucdata++);
    } else if (realtype == OUT_ADDRESS || realtype == OUT_REL2ADR ||
             realtype == OUT_REL4ADR) {
      if (segment == NO_SEG && realtype != OUT_ADDRESS)
          error(ERR_NONFATAL, "relative call to absolute address not"
              " supported by IEEE format");
      ldata = *(long *)data;
      if (realtype == OUT_REL2ADR)
          ldata += (size-2);
      if (realtype == OUT_REL4ADR)
          ldata += (size-4);
      ieee_write_fixup (segment, wrt, seg, size, realtype,ldata);
      if (size == 2)
          ieee_write_word (seg, ldata);
      else
          ieee_write_dword (seg, ldata);
    } 
    else if (realtype == OUT_RESERVE) {
      while (size--)
          ieee_write_byte(seg,0);
    }
}

static void ieee_data_new(struct ieeeSection *segto) {
    
    if (!segto->data)
      segto->data = segto->datacurr = nasm_malloc(sizeof(*(segto->datacurr)));
    else
      segto->datacurr = segto->datacurr->next = nasm_malloc(sizeof(*(segto->datacurr)));
    segto->datacurr->next = NULL;
}


/*
 * this routine is unalduterated bloatware.  I usually don't do this
 * but I might as well see what it is like on a harmless program.
 * If anyone wants to optimize this is a good canditate!
 */
static void ieee_write_fixup (long segment, long wrt, struct ieeeSection * segto,
                        int size, unsigned long realtype, long offset) {
    struct ieeeSection *target;
    struct ieeeFixupp s;

    /* Don't put a fixup for things NASM can calculate */
    if (wrt == NO_SEG && segment == NO_SEG)
      return;

    s.ftype = -1;
    /* if it is a WRT offset */
    if (wrt != NO_SEG) {
      s.ftype = FT_WRT;
      s.addend = offset;
      if (wrt >= SEG_ABS)
          s.id1 = -(wrt-SEG_ABS);
      else {
          if (wrt %2 && realtype != OUT_REL2ADR && realtype != OUT_REL4ADR) {
            wrt--;

            for (target = seghead; target; target = target->next)
                  if (target->index == wrt)
                        break;
              if (target) {
                  s.id1 = target->ieee_index;
                for (target = seghead; target; target = target->next)
                        if (target->index == segment)
                            break;
            
                if (target) 
                  s.id2 = target->ieee_index;
                  else {
                  /*
                   * Now we assume the segment field is being used
                   * to hold an extern index
                   */
                  long i = segment/2;
                  struct ExtBack *eb = ebhead;
                  while (i > EXT_BLKSIZ) {
                      if (eb)
                        eb = eb->next;
                      else
                        break;
                      i -= EXT_BLKSIZ;
                  }
                        /* if we have an extern decide the type and make a record
                   */
                  if (eb) {
                          s.ftype = FT_EXTWRT;
                          s.addend = 0;
                        s.id2 = eb->index[i];
                  }
                  else
                      error(ERR_NONFATAL,
                        "Source of WRT must be an offset");
                }
                  
            }
            else 
                  error(ERR_PANIC,
                      "unrecognised WRT value in ieee_write_fixup");
          }
          else 
            error(ERR_NONFATAL,"target of WRT must be a section ");
      }
      s.size = size;
      ieee_install_fixup(segto,&s);
      return;
    }
    /* Pure segment fixup ? */
    if (segment != NO_SEG) {
      s.ftype = FT_SEG;
      s.id1 = 0;
      if (segment >= SEG_ABS) {
          /* absolute far segment fixup */
          s.id1 = -(segment -~SEG_ABS);
      }
      else if (segment % 2) {
          /* fixup to named segment */
          /* look it up */
          for (target = seghead; target; target = target->next)
              if (target->index == segment-1)
                  break;
          if (target)
              s.id1 = target->ieee_index;
          else {
            /*
             * Now we assume the segment field is being used
             * to hold an extern index
             */
            long i = segment/2;
            struct ExtBack *eb = ebhead;
            while (i > EXT_BLKSIZ) {
                if (eb)
                  eb = eb->next;
                else
                  break;
                i -= EXT_BLKSIZ;
            }
            /* if we have an extern decide the type and make a record
             */
            if (eb) {
                if (realtype == OUT_REL2ADR || realtype == OUT_REL4ADR) {
                  error(ERR_PANIC,"Segment of a rel not supported in ieee_write_fixup");
                }
                else {
                        /* If we want the segment */
                      s.ftype = FT_EXTSEG;
                      s.addend = 0;
                      s.id1 = eb->index[i];
                }
                
            }
            else 
                /* If we get here the seg value doesn't make sense */
                  error(ERR_PANIC,
                      "unrecognised segment value in ieee_write_fixup");
          }

        } else {
          /* Assume we are offsetting directly from a section
           * So look up the target segment
           */
          for (target = seghead; target; target = target->next)
              if (target->index == segment)
                  break;
          if (target) {
            if (realtype == OUT_REL2ADR || realtype == OUT_REL4ADR) {
                /* PC rel to a known offset */
                  s.id1 = target->ieee_index;
                s.ftype = FT_REL;
                s.size = size;
                s.addend = offset;
            }
            else {
                /* We were offsetting from a seg */
                  s.id1 = target->ieee_index;
                s.ftype = FT_OFS;
                s.size = size;
                s.addend = offset;
            }
          }
          else {
            /*
             * Now we assume the segment field is being used
             * to hold an extern index
             */
            long i = segment/2;
            struct ExtBack *eb = ebhead;
            while (i > EXT_BLKSIZ) {
                if (eb)
                  eb = eb->next;
                else
                  break;
                i -= EXT_BLKSIZ;
            }
            /* if we have an extern decide the type and make a record
             */
            if (eb) {
                if (realtype == OUT_REL2ADR || realtype == OUT_REL4ADR) {
                    s.ftype = FT_EXTREL;
                    s.addend = 0;
                    s.id1 = eb->index[i];
                }
                else {
                      /* else we want the external offset */
                      s.ftype = FT_EXT;
                      s.addend = 0;
                      s.id1 = eb->index[i];
                }
                
            }
            else 
                /* If we get here the seg value doesn't make sense */
                  error(ERR_PANIC,
                      "unrecognised segment value in ieee_write_fixup");
          }
      }
      if (size != 2 && s.ftype == FT_SEG)
          error(ERR_NONFATAL, "IEEE format can only handle 2-byte"
                 " segment base references");
      s.size = size;
      ieee_install_fixup(segto,&s);
      return;
    }
    /* should never get here */
}
static void ieee_install_fixup(struct ieeeSection *seg, struct ieeeFixupp *fix)
{
    struct ieeeFixupp *f;
    f = nasm_malloc(sizeof(struct ieeeFixupp));
    memcpy(f,fix,sizeof(struct ieeeFixupp));
    f->offset = seg->currentpos;
    seg->currentpos += fix->size;
    f->next = NULL;
    if (seg->fptr)
      seg->flptr = seg->flptr->next = f;
    else
      seg->fptr = seg->flptr = f;

}

/*
 * segment registry
 */
static long ieee_segment (char *name, int pass, int *bits) {
    /*
     * We call the label manager here to define a name for the new
     * segment, and when our _own_ label-definition stub gets
     * called in return, it should register the new segment name
     * using the pointer it gets passed. That way we save memory,
     * by sponging off the label manager.
     */
    if (!name) {
      *bits = 16;
      if (!any_segs)
            return 0;
      return seghead->index;
    } else {
      struct ieeeSection *seg;
      int ieee_idx, attrs, rn_error;
      char *p;

      /*
       * Look for segment attributes.
       */
      attrs = 0;
      while (*name == '.')
          name++;              /* hack, but a documented one */
      p = name;
      while (*p && !isspace(*p))
          p++;
      if (*p) {
          *p++ = '\0';
          while (*p && isspace(*p))
            *p++ = '\0';
      }
      while (*p) {
          while (*p && !isspace(*p))
            p++;
          if (*p) {
            *p++ = '\0';
            while (*p && isspace(*p))
                *p++ = '\0';
          }

          attrs++;
      }

      ieee_idx = 1;
      for (seg = seghead; seg; seg = seg->next) {
          ieee_idx++;
          if (!strcmp(seg->name, name)) {
            if (attrs > 0 && pass == 1)
                error(ERR_WARNING, "segment attributes specified on"
                    " redeclaration of segment: ignoring");
            if (seg->use32)
                *bits = 32;
            else
                *bits = 16;
            return seg->index;
          }
      }

      *segtail = seg = nasm_malloc(sizeof(*seg));
      seg->next = NULL;
      segtail = &seg->next;
      seg->index = seg_alloc();
      seg->ieee_index = ieee_idx;
      any_segs = TRUE;
      seg->name = NULL;
      seg->currentpos = 0;
      seg->align = 1;                /* default */
      seg->use32 = *bits == 32;      /* default to user spec */
      seg->combine = CMB_PUBLIC;     /* default */
      seg->pubhead = NULL;
      seg->pubtail = &seg->pubhead;
      seg->data = NULL;
      seg->fptr = NULL;
      seg->lochead = NULL;
      seg->loctail = &seg->lochead;

      /*
       * Process the segment attributes.
       */
      p = name;
      while (attrs--) {
          p += strlen(p);
          while (!*p) p++;

          /*
           * `p' contains a segment attribute.
           */
          if (!nasm_stricmp(p, "private"))
            seg->combine = CMB_PRIVATE;
          else if (!nasm_stricmp(p, "public"))
            seg->combine = CMB_PUBLIC;
          else if (!nasm_stricmp(p, "common"))
            seg->combine = CMB_COMMON;
          else if (!nasm_stricmp(p, "use16"))
            seg->use32 = FALSE;
          else if (!nasm_stricmp(p, "use32"))
            seg->use32 = TRUE;
          else if (!nasm_strnicmp(p, "align=", 6)) {
            seg->align = readnum(p+6, &rn_error);
            if (seg->align == 0)
                seg->align = 1;
            if (rn_error) {
                seg->align = 1;
                error (ERR_NONFATAL, "segment alignment should be"
                     " numeric");
            }
            switch ((int) seg->align) {
              case 1:          /* BYTE */
              case 2:          /* WORD */
              case 4:          /* DWORD */
              case 16:         /* PARA */
              case 256:        /* PAGE */
              case 8:
              case 32:
              case 64:
              case 128:
                break;
              default:
                error(ERR_NONFATAL, "invalid alignment value %d",
                    seg->align);
                seg->align = 1;
                break;
            }
          } else if (!nasm_strnicmp(p, "absolute=", 9)) {
            seg->align = SEG_ABS + readnum(p+9, &rn_error);
            if (rn_error)
                error (ERR_NONFATAL, "argument to `absolute' segment"
                     " attribute should be numeric");
          }
      }

      ieee_seg_needs_update = seg;
      if (seg->align >= SEG_ABS)
          deflabel (name, NO_SEG, seg->align - SEG_ABS, 
                  NULL, FALSE, FALSE, &of_ieee, error);
      else
          deflabel (name, seg->index+1, 0L, 
                  NULL, FALSE, FALSE, &of_ieee, error);
      ieee_seg_needs_update = NULL;

      if (seg->use32)
          *bits = 32;
      else
          *bits = 16;
      return seg->index;
    }
}
/*
 * directives supported
 */
static int ieee_directive (char *directive, char *value, int pass) 
{
    
    (void) value;
    (void) pass;
    if (!strcmp(directive, "uppercase")) {
      ieee_uppercase = TRUE;
      return 1;
    }
    return 0;
}
/*
 * Return segment data
 */
static long ieee_segbase (long segment) 
{
    struct ieeeSection *seg;

    /*
     * Find the segment in our list.
     */
    for (seg = seghead; seg; seg = seg->next)
      if (seg->index == segment-1)
          break;

    if (!seg)
      return segment;                /* not one of ours - leave it alone */

    if (seg->align >= SEG_ABS)
      return seg->align;             /* absolute segment */

    return segment;                  /* no special treatment */
}
/*
 * filename
 */
static void ieee_filename (char *inname, char *outname, efunc error) {
    strcpy(ieee_infile, inname);
    standard_extension (inname, outname, ".o", error);
}

static void ieee_write_file (int debuginfo) {
    struct tm *thetime;
    time_t reltime;
    struct FileName *fn;
    struct ieeeSection *seg;
    struct ieeePublic *pub, *loc;
    struct ieeeExternal *ext;
    struct ieeeObjData *data;
    struct ieeeFixupp *fix;
    struct Array *arr;
    static char boast[] = "The Netwide Assembler " NASM_VER;
    int i;

    /*
     * Write the module header
     */
    ieee_putascii("MBFNASM,%02X%s.\r\n",strlen(ieee_infile),ieee_infile);

    /*
     * Write the NASM boast comment.
     */
    ieee_putascii("CO0,%02X%s.\r\n",strlen(boast),boast);

    /* 
     * write processor-specific information
     */
    ieee_putascii("AD8,4,L.\r\n");

    /*
     * date and time
     */
    time(&reltime);
    thetime = localtime(&reltime);
    ieee_putascii("DT%04d%02d%02d%02d%02d%02d.\r\n", 
                  1900+thetime->tm_year,thetime->tm_mon+1,thetime->tm_mday,
                  thetime->tm_hour, thetime->tm_min, thetime->tm_sec);
    /* 
     * if debugging, dump file names
     */
    for (fn = fnhead; fn && debuginfo; fn = fn->next) {
      ieee_putascii("C0105,%02X%s.\r\n",strlen(fn->name),fn->name);
    }
     
    ieee_putascii("CO101,07ENDHEAD.\r\n");
    /*
     * the standard doesn't specify when to put checksums,
     * we'll just do it periodically.
     */
    ieee_putcs(FALSE);

    /* 
     * Write the section headers
     */
    seg = seghead;
    if (!debuginfo && !strcmp(seg->name,"??LINE"))
      seg = seg->next;
    while (seg) {
      char buf[256];
      char attrib;
      switch(seg->combine) {
          case CMB_PUBLIC:
          default:
            attrib = 'C';
            break;
          case CMB_PRIVATE:
            attrib = 'S';
            break;
          case CMB_COMMON:
            attrib = 'M';
            break;
      }
      ieee_unqualified_name(buf,seg->name);
      if (seg->align >= SEG_ABS) {
          ieee_putascii("ST%X,A,%02X%s.\r\n",seg->ieee_index,strlen(buf), buf);
          ieee_putascii("ASL%X,%lX.\r\n",seg->ieee_index, (seg->align - SEG_ABS)*16);
      }
      else {
          ieee_putascii("ST%X,%c,%02X%s.\r\n",seg->ieee_index,attrib,strlen(buf), buf);
          ieee_putascii("SA%X,%lX.\r\n",seg->ieee_index,seg->align);
          ieee_putascii("ASS%X,%X.\r\n",seg->ieee_index, seg->currentpos);
      }
      seg = seg->next;
    }
    /*
     * write the start address if there is one
     */
    if (ieee_entry_seg) {
        for (seg = seghead; seg; seg = seg->next)
          if (seg->index == ieee_entry_seg)
            break;
      if (!seg)
          error(ERR_PANIC,"Start address records are incorrect");
      else 
          ieee_putascii("ASG,R%X,%lX,+.\r\n",seg->ieee_index, ieee_entry_ofs);
    } 


    ieee_putcs(FALSE);
    /*
     * Write the publics
     */
    i = 1;
    for (seg = seghead; seg; seg = seg->next) {
        for (pub = seg->pubhead; pub; pub = pub->next) {
          char buf[256];
          ieee_unqualified_name(buf,pub->name);
                ieee_putascii("NI%X,%02X%s.\r\n",i, strlen(buf), buf);
          if (pub->segment == -1)  
                  ieee_putascii("ASI%X,R%X,%lX,+.\r\n", i, pub->index,pub->offset);
          else
                  ieee_putascii("ASI%X,%lX,%lX,+.\r\n", i, pub->segment*16,pub->offset);
          if (debuginfo) {
            if (pub->type >= 0x100)
                ieee_putascii("ATI%X,T%X.\r\n", i, pub->type - 0x100);
            else
                ieee_putascii("ATI%X,%X.\r\n", i, pub->type);
          } 
          i++;
        }
    }
    pub = fpubhead;
    i = 1;
    while (pub) {
      char buf[256];
      ieee_unqualified_name(buf,pub->name);
            ieee_putascii("NI%X,%02X%s.\r\n",i, strlen(buf), buf);
      if (pub->segment == -1)  
                ieee_putascii("ASI%X,R%X,%lX,+.\r\n", i, pub->index,pub->offset);
      else
                ieee_putascii("ASI%X,%lX,%lX,+.\r\n", i, pub->segment*16,pub->offset);
      if (debuginfo) {
          if (pub->type >= 0x100)
            ieee_putascii("ATI%X,T%X.\r\n", i, pub->type - 0x100);
          else
            ieee_putascii("ATI%X,%X.\r\n", i, pub->type);
      }
      i++;
        pub = pub->next;
    }
    /*
     * Write the externals
     */
    ext = exthead;
    i = 1;
    while (ext) {
      char buf[256];
      ieee_unqualified_name(buf,ext->name);
            ieee_putascii("NX%X,%02X%s.\r\n",i++, strlen(buf), buf);
        ext = ext->next;
    }
    ieee_putcs(FALSE);

    /*
     * IEEE doesn't have a standard pass break record
     * so use the ladsoft variant
     */
    ieee_putascii("CO100,06ENDSYM.\r\n");

    /*
     * now put types
     */
    i = ARRAY_BOT;
    for (arr = arrhead; arr && debuginfo; arr = arr->next) {
      ieee_putascii("TY%X,20,%X,%lX.\r\n",i++,arr->basetype,arr->size);
    }
    /*
     * now put locals
     */
    i = 1;
    for (seg = seghead; seg && debuginfo; seg = seg->next) {
        for (loc = seg->lochead; loc; loc = loc->next) {
          char buf[256];
          ieee_unqualified_name(buf,loc->name);
                ieee_putascii("NN%X,%02X%s.\r\n",i, strlen(buf), buf);
          if (loc->segment == -1)  
                  ieee_putascii("ASN%X,R%X,%lX,+.\r\n", i, loc->index,loc->offset);
          else
                  ieee_putascii("ASN%X,%lX,%lX,+.\r\n", i, loc->segment*16,loc->offset);
          if (debuginfo) {
            if (loc->type >= 0x100)
                ieee_putascii("ATN%X,T%X.\r\n", i, loc->type - 0x100);
            else
                ieee_putascii("ATN%X,%X.\r\n", i, loc->type);
          }
          i++;
        }
    }

    /*
     *  put out section data;
     */ 
    seg = seghead;
    if (!debuginfo && !strcmp(seg->name,"??LINE"))
      seg = seg->next;
    while (seg) {
      if (seg->currentpos) {
          long size,org = 0;
          data = seg->data;
          ieee_putascii("SB%X.\r\n",seg->ieee_index);
          fix = seg->fptr;
          while (fix) {
            size = HUNKSIZE - (org %HUNKSIZE);
            size = size +org > seg->currentpos ? seg->currentpos-org : size;
            size = fix->offset - org > size ? size : fix->offset-org;
            org = ieee_putld(org,org+size,data->data);
            if (org % HUNKSIZE == 0)
                data = data->next;
            if (org == fix->offset) {
                org += ieee_putlr(fix);
                fix = fix->next;
            }
          }
          while (org < seg->currentpos && data) {
            size = seg->currentpos-org > HUNKSIZE ? HUNKSIZE : seg->currentpos - org;
            org = ieee_putld(org,org+size,data->data);
            data = data->next;
          }
          ieee_putcs(FALSE);
            
      }
      seg = seg->next;
    }
    /*
     * module end record
     */
    ieee_putascii("ME.\r\n");
}

static void ieee_write_byte(struct ieeeSection *seg, int data) {
    int temp;
    if (!(temp = seg->currentpos++ % HUNKSIZE))
      ieee_data_new(seg);
    seg->datacurr->data[temp] = data;
}

static void ieee_write_word(struct ieeeSection *seg, int data) {
    ieee_write_byte(seg, data & 0xFF);
    ieee_write_byte(seg,(data >> 8) & 0xFF);
}

static void ieee_write_dword(struct ieeeSection *seg, long data) {
    ieee_write_byte(seg, data & 0xFF);
    ieee_write_byte(seg,(data >> 8) & 0xFF);
    ieee_write_byte(seg,(data >> 16) & 0xFF);
    ieee_write_byte(seg,(data >> 24) & 0xFF);
}
static void ieee_putascii(char *format, ...)
{
      char buffer[256];
      int i,l;
      va_list ap;

      va_start(ap, format);
      vsprintf(buffer, format, ap);
      l = strlen(buffer);
      for (i=0; i < l; i++)
            if ((buffer[i] & 0xff) > 31)
                  checksum+=buffer[i];
      va_end(ap);
      fprintf(ofp,buffer);
}

/*
 * put out a checksum record */
static void ieee_putcs(int toclear)
{
      if (toclear) {
            ieee_putascii("CS.\r\n");
      }
      else {
            checksum += 'C';
            checksum += 'S';
            ieee_putascii("CS%02X.\r\n",checksum & 127);
      }
      checksum = 0;
}

static long ieee_putld(long start, long end, unsigned char *buf)
{
      long val;
      if (start == end)
            return(start);
      val = start % HUNKSIZE;
      /* fill up multiple lines */
      while (end - start >= LDPERLINE) {
            int i;
            ieee_putascii("LD");
            for (i=0; i < LDPERLINE; i++) {
                  ieee_putascii("%02X",buf[val++]);
                  start++;
            }
            ieee_putascii(".\r\n");
      }
      /* if no partial lines */
      if (start == end)
            return(start);
      /* make a partial line */
      ieee_putascii("LD");
      while (start < end) {
            ieee_putascii("%02X",buf[val++]);
            start++;
      }
      ieee_putascii(".\r\n");
      return(start);
}
static long ieee_putlr(struct ieeeFixupp *p)
{
/*
 * To deal with the vagaries of segmentation the LADsoft linker
 * defines two types of segments: absolute and virtual.  Note that
 * 'absolute' in this context is a different thing from the IEEE
 * definition of an absolute segment type, which is also supported. If a
 * sement is linked in virtual mode the low limit (L-var) is
 * subtracted from each R,X, and P variable which appears in an
 * expression, so that we can have relative offsets.  Meanwhile
 * in the ABSOLUTE mode this subtraction is not done and
 * so we can use absolute offsets from 0.  In the LADsoft linker
 * this configuration is not done in the assemblker source but in
 * a source the linker reads.  Generally this type of thing only
 * becomes an issue if real mode code is used.  A pure 32-bit linker could
 * get away without defining the virtual mode...
 */
      char buf[40];
      long size=p->size;
      switch(p->ftype) {
          case FT_SEG:
              if (p->id1 < 0)
                sprintf(buf,"%lX",-p->id1);
            else
                sprintf(buf,"L%lX,10,/",p->id1);
            break;
          case FT_OFS:
            sprintf(buf,"R%lX,%lX,+",p->id1,p->addend);
            break;
          case FT_REL:
            sprintf(buf,"R%lX,%lX,+,P,-,%X,-",p->id1,p->addend,p->size);
            break;
            
          case FT_WRT:
              if (p->id2 < 0)
                sprintf(buf,"R%lX,%lX,+,L%lX,+,%lX,-",p->id2,p->addend,p->id2,-p->id1*16);
            else
                sprintf(buf,"R%lX,%lX,+,L%lX,+,L%lX,-",p->id2,p->addend,p->id2,p->id1);
            break;
          case FT_EXT:
            sprintf(buf,"X%lX",p->id1);
            break;
          case FT_EXTREL:
            sprintf(buf,"X%lX,P,-,%lX,-",p->id1,size);
            break;
          case FT_EXTSEG:
            /* We needed a non-ieee hack here.
             * We introduce the Y variable, which is the low
             * limit of the native segment the extern resides in
             */
            sprintf(buf,"Y%lX,10,/",p->id1);
            break;
          case FT_EXTWRT:
              if (p->id2 < 0)
                sprintf(buf,"X%lX,Y%lX,+,%lX,-",p->id2,p->id2,-p->id1*16);
            else
                sprintf(buf,"X%lX,Y%lX,+,L%lX,-",p->id2,p->id2,p->id1);
            break;
      }
      ieee_putascii("LR(%s,%lX).\r\n", buf, size);

      return(size);
}
/* Dump all segment data (text and fixups )*/

static void ieee_unqualified_name(char *dest, char *source)
{
    if (ieee_uppercase) {
      while (*source)
          *dest++ = toupper(*source++);
        *dest = 0;
    }
    else strcpy(dest,source);
}
void dbgls_init(struct ofmt * of, void * id, FILE * fp, efunc error)
{
    int tempint;
    (void) of;
    (void) id;
    (void) fp;
    (void) error;

    fnhead = NULL;
    fntail = &fnhead;
    arrindex = ARRAY_BOT ;
    arrhead = NULL;
    arrtail = &arrhead;
    ieee_segment("??LINE", 2, &tempint);
    any_segs = FALSE;
}
static void dbgls_cleanup(void)
{
    struct ieeeSection *segtmp;
    while (fnhead) {
      struct FileName *fntemp = fnhead;
      fnhead = fnhead->next;
      nasm_free (fntemp->name);
      nasm_free (fntemp);
    }
    for (segtmp = seghead; segtmp; segtmp = segtmp->next) {
      while (segtmp->lochead) {
          struct ieeePublic *loctmp = segtmp->lochead;
          segtmp->lochead = loctmp->next;
          nasm_free (loctmp->name);
          nasm_free (loctmp);
      }
    }
    while (arrhead) {
      struct Array *arrtmp = arrhead;
        arrhead = arrhead->next;
        nasm_free (arrtmp);
    }
}

/*
 * because this routine is not bracketed in
 * the main program, this routine will be called even if there
 * is no request for debug info
 * so, we have to make sure the ??LINE segment is avaialbe
 * as the first segment when this debug format is selected
 */
static void dbgls_linnum (const char *lnfname, long lineno, long segto)
{
    struct FileName *fn;
    struct ieeeSection *seg;
    int i = 0;
    if (segto == NO_SEG)
      return;

    /*
     * If `any_segs' is still FALSE, we must define a default
     * segment.
     */
    if (!any_segs) {
      int tempint;                   /* ignored */
      if (segto != ieee_segment("__NASMDEFSEG", 2, &tempint))
          error (ERR_PANIC, "strange segment conditions in OBJ driver");
    }

    /*
     * Find the segment we are targetting.
     */
    for (seg = seghead; seg; seg = seg->next)
      if (seg->index == segto)
          break;
    if (!seg)
      error (ERR_PANIC, "lineno directed to nonexistent segment?");

    for (fn = fnhead; fn; fn = fnhead->next) {
      if (!nasm_stricmp(lnfname,fn->name))
          break;
        i++;
    }
    if (!fn) {
      fn = nasm_malloc ( sizeof( *fn));
      fn->name = nasm_malloc ( strlen(lnfname) + 1) ;
      fn->index = i;
        strcpy (fn->name,lnfname);
      fn->next = NULL;
      *fntail = fn;
      fntail = &fn->next;
    }
    ieee_write_byte(seghead, fn->index);
    ieee_write_word(seghead, lineno);
    ieee_write_fixup (segto, NO_SEG, seghead, 4, OUT_ADDRESS, seg->currentpos);

}
static void dbgls_deflabel (char *name, long segment,
                    long offset, int is_global, char *special) 
{
    struct ieeeSection *seg;
    int used_special;         /* have we used the special text? */

    /* Keep compiler from warning about special and used_special */
    used_special = special ? FALSE : FALSE;

    /*
     * If it's a special-retry from pass two, discard it.
     */
    if (is_global == 3)
      return;

    /*
     * First check for the double-period, signifying something
     * unusual.
     */
    if (name[0] == '.' && name[1] == '.' && name[2] != '@') {
      return;
    }

    /*
     * Case (i):
     */
    if (ieee_seg_needs_update)
      return;
    if (segment < SEG_ABS && segment != NO_SEG && segment % 2)
      return;

    if (segment >= SEG_ABS || segment == NO_SEG) {
      return;
    }

    /*
     * If `any_segs' is still FALSE, we might need to define a
     * default segment, if they're trying to declare a label in
     * `first_seg'.  But the label should exist due to a prior
     * call to ieee_deflabel so we can skip that.
     */

    for (seg = seghead; seg; seg = seg->next)
      if (seg->index == segment) {
          struct ieeePublic *loc;
          /*
           * Case (ii). Maybe MODPUB someday?
           */
          if (!is_global) {
            last_defined = loc  = nasm_malloc (sizeof(*loc));
            *seg->loctail = loc;
            seg->loctail = &loc->next;
            loc->next = NULL;
            loc->name = nasm_strdup(name);
            loc->offset = offset;
            loc->segment = -1;
            loc->index = seg->ieee_index;
          }
      }
}
static void dbgls_typevalue (long type)
{
    int elem = TYM_ELEMENTS(type);
    type = TYM_TYPE(type);

    if (! last_defined)
      return;

    switch (type) {
      case TY_BYTE:
          last_defined->type = 1; /* unsigned char */
          break;
      case TY_WORD:
          last_defined->type = 3; /* unsigned word */
          break;
      case TY_DWORD:
          last_defined->type = 5; /* unsigned dword */
          break;
      case TY_FLOAT:
          last_defined->type = 9; /* float */
          break;
      case TY_QWORD:
          last_defined->type = 10; /* qword */
          break;
      case TY_TBYTE:
          last_defined->type = 11; /* TBYTE */
          break;
      default:
          last_defined->type = 0x10; /* near label */
          break;
    }
               
    if (elem > 1) {
        struct Array *arrtmp = nasm_malloc (sizeof(*arrtmp));
        int vtype = last_defined->type;
        arrtmp->size = elem;
        arrtmp->basetype = vtype;
        arrtmp->next = NULL;
        last_defined->type = arrindex++ + 0x100;
        *arrtail = arrtmp;
        arrtail = & (arrtmp->next);
    }
    last_defined = NULL;
}
static void dbgls_output (int output_type, void *param)
{
    (void) output_type;
    (void) param;
}
static struct dfmt ladsoft_debug_form = {
    "LADsoft Debug Records",
    "ladsoft",
    dbgls_init,
    dbgls_linnum,
    dbgls_deflabel,
    null_debug_routine,
    dbgls_typevalue,
    dbgls_output,
    dbgls_cleanup,
};
static struct dfmt *ladsoft_debug_arr[3] = {
      &ladsoft_debug_form,
      &null_debug_form,
      NULL
};
struct ofmt of_ieee = {
    "IEEE-695 (LADsoft variant) object file format",
    "ieee",
    NULL,
    ladsoft_debug_arr,
    &null_debug_form,
    NULL,
    ieee_init,
    ieee_set_info,
    ieee_out,
    ieee_deflabel,
    ieee_segment,
    ieee_segbase,
    ieee_directive,
    ieee_filename,
    ieee_cleanup
};

#endif /* OF_IEEE */

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