-***************
-*** 29,42 ****
- #include <stdlib.h>
- #include <string.h>
-
- #include "rdoff.h"
- #include "symtab.h"
- #include "collectn.h"
- #include "rdlib.h"
- #include "segtab.h"
-- #include "multboot.h"
-
-- #define LDRDF_VERSION "1.01 alpha 2"
-
- #define RDF_MAXSEGS 64
- /* #define STINGY_MEMORY */
---- 29,42 ----
- #include <stdlib.h>
- #include <string.h>
-
-+ #include "multboot.h"
- #include "rdoff.h"
- #include "symtab.h"
- #include "collectn.h"
- #include "rdlib.h"
- #include "segtab.h"
-
-+ #define LDRDF_VERSION "1.02"
-
- #define RDF_MAXSEGS 64
- /* #define STINGY_MEMORY */
+/* ldrdf.c RDOFF Object File linker/loader main program
+ *
+ * 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.
+ */
+
+/*
+ * TODO: actually get this new version working!
+ * - finish off write_output() - appears to be done
+ * - implement library searching - appears to be done
+ * - maybe we only want to do one pass, for performance reasons?
+ * this makes things a little harder, but unix 'ld' copes...
+ * - implement command line options - appears to be done
+ * - improve symbol table implementation - done, thanks to Graeme Defty
+ * - keep a cache of symbol names in each library module so
+ * we don't have to constantly recheck the file
+ * - general performance improvements
+ *
+ * BUGS & LIMITATIONS: this program doesn't support multiple code, data
+ * or bss segments, therefore for 16 bit programs whose code, data or BSS
+ * segment exceeds 64K in size, it will not work. This program probably
+ * wont work if compiled by a 16 bit compiler. Try DJGPP if you're running
+ * under DOS. '#define STINGY_MEMORY' may help a little.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "multboot.h"
+#include "rdoff.h"
+#include "symtab.h"
+#include "collectn.h"
+#include "rdlib.h"
+#include "segtab.h"
+
+#define LDRDF_VERSION "1.02"
+
+#define RDF_MAXSEGS 64
+/* #define STINGY_MEMORY */
+
+/* =======================================================================
+ * Types & macros that are private to this program
+ */
+
+struct segment_infonode {
+ int dest_seg; /* output segment to be placed into, -1 to
+ skip linking this segment */
+ long reloc; /* segment's relocation factor */
+};
+
+
+struct modulenode {
+ rdffile f; /* the RDOFF file structure */
+ struct segment_infonode seginfo[RDF_MAXSEGS]; /* what are we doing
+ with each segment? */
+ void * header;
+ char * name;
+ struct modulenode * next;
+ long bss_reloc;
+};
+
+#include "ldsegs.h"
+
+#define newstr(str) strcpy(malloc(strlen(str) + 1),str)
+#define newstrcat(s1,s2) strcat(strcpy(malloc(strlen(s1)+strlen(s2)+1),s1),s2)
+
+/* ==========================================================================
+ * Function prototypes of private utility functions
+ */
+
+void processmodule(const char * filename, struct modulenode * mod);
+int allocnewseg(int16 type,int16 reserved);
+int findsegment(int16 type,int16 reserved);
+void symtab_add(const char * symbol, int segment, long offset);
+int symtab_get(const char * symbol, int * segment, long * offset);
+
+/* =========================================================================
+ * Global data structures.
+ */
+
+/* a linked list of modules that will be included in the output */
+struct modulenode * modules = NULL;
+struct modulenode * lastmodule = NULL;
+
+/* a linked list of libraries to be searched for unresolved imported symbols */
+struct librarynode * libraries = NULL;
+struct librarynode * lastlib = NULL;
+
+/* the symbol table */
+void * symtab = NULL;
+
+/* objects search path */
+char * objpath = NULL;
+
+/* libraries search path */
+char * libpath = NULL;
+
+/* error file */
+static FILE * error_file;
+
+#ifdef _MULTBOOT_H
+
+/* loading address for multiboot header */
+unsigned MBHloadAddr;
+
+/*
+ * Tiny code that moves RDF loader to its working memory region:
+ * mov esi,SOURCE_ADDR ; BE xx xx xx xx
+ * mov edi,DEST_ADDR ; BF xx xx xx xx
+ * mov esp,edi ; 89 FC
+ * push edi ; 57
+ * mov ecx,RDFLDR_LENGTH/4 ; B9 xx xx xx xx
+ * cld ; FC
+ * rep movsd ; F3 A5
+ * ret ; C3
+ */
+
+#define RDFLDR_LENGTH 4096 /* Loader will be moved to unused */
+#define RDFLDR_DESTLOC 0xBF000 /* video page */
+
+unsigned char RDFloaderMover[]={
+ 0xBE, 0, 0, 0, 0, 0xBF, 0, 0xF0, 0xB, 0,
+ 0x89, 0xFC, 0x57,
+ 0xB9, 0, 4, 0, 0,
+ 0xFC, 0xF3, 0xA5, 0xC3
+};
+
+#endif
+
+/* the header of the output file, built up stage by stage */
+rdf_headerbuf * newheader = NULL;
+
+/* The current state of segment allocation, including information about
+ * which output segment numbers have been allocated, and their types and
+ * amount of data which has already been allocated inside them.
+ */
+struct SegmentHeaderRec outputseg[RDF_MAXSEGS];
+int nsegs = 0;
+long bss_length;
+
+/* global options which affect how the program behaves */
+struct ldrdfoptions {
+ int verbose;
+ int align;
+ int warnUnresolved;
+ int errorUnresolved;
+ int strip;
+ int respfile;
+ int stderr_redir;
+ int objpath;
+ int libpath;
+ int addMBheader;
+} options;
+
+int errorcount = 0; /* determines main program exit status */
+
+/* =========================================================================
+ * Utility functions
+ */
+
+
+/*
+ * initsegments()
+ *
+ * sets up segments 0, 1, and 2, the initial code data and bss segments
+ */
+
+void initsegments()
+{
+ nsegs = 3;
+ outputseg[0].type = 1;
+ outputseg[0].number = 0;
+ outputseg[0].reserved = 0;
+ outputseg[0].length = 0;
+ outputseg[1].type = 2;
+ outputseg[1].number = 1;
+ outputseg[1].reserved = 0;
+ outputseg[1].length = 0;
+ outputseg[2].type = 0xFFFF; /* reserved segment type */
+ outputseg[2].number = 2;
+ outputseg[2].reserved = 0;
+ outputseg[2].length = 0;
+ bss_length = 0;
+}
+
+/*
+ * loadmodule
+ *
+ * Determine the characteristics of a module, and decide what to do with
+ * each segment it contains (including determining destination segments and
+ * relocation factors for segments that are kept).
+ */
+
+void loadmodule(const char * filename)
+{
+ if (options.verbose)
+ printf("loading `%s'\n", filename);
+
+ /* allocate a new module entry on the end of the modules list */
+ if (!modules)
+ {
+ modules = malloc (sizeof(*modules));
+ lastmodule = modules;
+ }
+ else
+ {
+ lastmodule->next = malloc (sizeof(*modules));
+ lastmodule = lastmodule->next;
+ }
+
+ if ( ! lastmodule)
+ {
+ fprintf(stderr, "ldrdf: out of memory\n");
+ exit(1);
+ }
+
+ /* open the file using 'rdfopen', which returns nonzero on error */
+
+ if (rdfopen(&lastmodule->f, filename) != 0)
+ {
+ rdfperror("ldrdf", filename);
+ exit(1);
+ }
+
+ /*
+ * store information about the module, and determine what segments
+ * it contains, and what we should do with them (determine relocation
+ * factor if we decide to keep them)
+ */
+
+ lastmodule->header = NULL;
+ lastmodule->name = strdup(filename);
+ lastmodule->next = NULL;
+
+ processmodule(filename, lastmodule);
+}
+
+/*
+ * processmodule()
+ *
+ * step through each segment, determine what exactly we're doing with
+ * it, and if we intend to keep it, determine (a) which segment to
+ * put it in and (b) whereabouts in that segment it will end up.
+ * (b) is fairly easy, cos we're now keeping track of how big each segment
+ * in our output file is...
+ */
+
+void processmodule(const char * filename, struct modulenode * mod)
+{
+ struct segconfig sconf;
+ int seg, outseg;
+ void * header;
+ rdfheaderrec * hr;
+ long bssamount = 0;
+
+ for (seg = 0; seg < mod->f.nsegs; seg++)
+ {
+ /*
+ * get the segment configuration for this type from the segment
+ * table. getsegconfig() is a macro, defined in ldsegs.h.
+ */
+ getsegconfig(sconf, mod->f.seg[seg].type);
+
+ if (options.verbose > 1) {
+ printf ("%s %04x [%04x:%10s] ", filename, mod->f.seg[seg].number,
+ mod->f.seg[seg].type, sconf.typedesc);
+ }
+ /*
+ * sconf->dowhat tells us what to do with a segment of this type.
+ */
+ switch (sconf.dowhat) {
+ case SEG_IGNORE:
+ /*
+ * Set destination segment to -1, to indicate that this segment
+ * should be ignored for the purpose of output, ie it is left
+ * out of the linked executable.
+ */
+ mod->seginfo[seg].dest_seg = -1;
+ if (options.verbose > 1) printf("IGNORED\n");
+ break;
+
+ case SEG_NEWSEG:
+ /*
+ * The configuration tells us to create a new segment for
+ * each occurrence of this segment type.
+ */
+ outseg = allocnewseg(sconf.mergetype,
+ mod->f.seg[seg].reserved);
+ mod->seginfo[seg].dest_seg = outseg;
+ mod->seginfo[seg].reloc = 0;
+ outputseg[outseg].length = mod->f.seg[seg].length;
+ if (options.verbose > 1)
+ printf ("=> %04x:%08lx (+%04lx)\n", outseg,
+ mod->seginfo[seg].reloc,
+ mod->f.seg[seg].length);
+ break;
+
+ case SEG_MERGE:
+ /*
+ * The configuration tells us to merge the segment with
+ * a previously existing segment of type 'sconf.mergetype',
+ * if one exists. Otherwise a new segment is created.
+ * This is handled transparently by 'findsegment()'.
+ */
+ outseg = findsegment(sconf.mergetype,
+ mod->f.seg[seg].reserved);
+ mod->seginfo[seg].dest_seg = outseg;
+
+ /*
+ * We need to add alignment to these segments.
+ */
+ if (outputseg[outseg].length % options.align != 0)
+ outputseg[outseg].length +=
+ options.align - (outputseg[outseg].length % options.align);
+
+ mod->seginfo[seg].reloc = outputseg[outseg].length;
+ outputseg[outseg].length += mod->f.seg[seg].length;
+
+ if (options.verbose > 1)
+ printf ("=> %04x:%08lx (+%04lx)\n", outseg,
+ mod->seginfo[seg].reloc,
+ mod->f.seg[seg].length);
+ }
+
+ }
+
+ /*
+ * extract symbols from the header, and dump them into the
+ * symbol table
+ */
+ header = malloc(mod->f.header_len);
+ if (!header) {
+ fprintf(stderr, "ldrdf: not enough memory\n");
+ exit(1);
+ }
+ if (rdfloadseg(&mod->f, RDOFF_HEADER, header)) {
+ rdfperror("ldrdf", filename);
+ exit(1);
+ }
+
+ while ((hr = rdfgetheaderrec (&mod->f)))
+ {
+ switch(hr->type) {
+ case 2: /* imported symbol - define with seg = -1 */
+ case 7:
+ symtab_add(hr->i.label, -1, 0);
+ break;
+
+ case 3: /* exported symbol */
+ {
+ int destseg;
+ long destreloc;
+
+ if (hr->e.segment == 2)
+ {
+ destreloc = bss_length;
+ if (destreloc % options.align != 0)
+ destreloc += options.align - (destreloc % options.align);
+ destseg = 2;
+ }
+ else
+ {
+ if ((destseg = mod->seginfo[(int)hr->e.segment].dest_seg) == -1)
+ continue;
+ destreloc = mod->seginfo[(int)hr->e.segment].reloc;
+ }
+ symtab_add(hr->e.label, destseg, destreloc + hr->e.offset);
+ break;
+ }
+
+ case 5: /* BSS reservation */
+ /*
+ * first, amalgamate all BSS reservations in this module
+ * into one, because we allow this in the output format.
+ */
+ bssamount += hr->b.amount;
+ break;
+ }
+ }
+
+ if (bssamount != 0)
+ {
+ /*
+ * handle the BSS segment - first pad the existing bss length
+ * to the correct alignment, then store the length in bss_reloc
+ * for this module. Then add this module's BSS length onto
+ * bss_length.
+ */
+ if (bss_length % options.align != 0)
+ bss_length += options.align - (bss_length % options.align);
+
+ mod->bss_reloc = bss_length;
+ if (options.verbose > 1) {
+ printf ("%s 0002 [ BSS] => 0002:%08lx (+%04lx)\n",
+ filename, bss_length, bssamount);
+ }
+ bss_length += bssamount;
+ }
+
+#ifdef STINGY_MEMORY
+ /*
+ * we free the header buffer here, to save memory later.
+ * this isn't efficient, but probably halves the memory usage
+ * of this program...
+ */
+ mod->f.header_loc = NULL;
+ free(header);
+
+#endif
+
+}
+
+
+/*
+ * Look in list for module by its name.
+ */
+int lookformodule(const char *name)
+ {
+ struct modulenode *curr=modules;
+
+ while(curr) {
+ if (!strcmp(name,curr->name)) return 1;
+ curr = curr->next;
+ }
+ return 0;
+ }
+
+
+/*
+ * allocnewseg()
+ * findsegment()
+ *
+ * These functions manipulate the array of output segments, and are used
+ * by processmodule(). allocnewseg() allocates a segment in the array,
+ * initialising it to be empty. findsegment() first scans the array for
+ * a segment of the type requested, and if one isn't found allocates a
+ * new one.
+ */
+int allocnewseg(int16 type,int16 reserved)
+{
+ outputseg[nsegs].type = type;
+ outputseg[nsegs].number = nsegs;
+ outputseg[nsegs].reserved = reserved;
+ outputseg[nsegs].length = 0;
+ outputseg[nsegs].offset = 0;
+ outputseg[nsegs].data = NULL;
+
+ return nsegs++;
+}
+
+int findsegment(int16 type,int16 reserved)
+{
+ int i;
+
+ for (i = 0; i < nsegs; i++)
+ if (outputseg[i].type == type) return i;
+
+ return allocnewseg(type,reserved);
+}
+
+/*
+ * symtab_add()
+ *
+ * inserts a symbol into the global symbol table, which associates symbol
+ * names either with addresses, or a marker that the symbol hasn't been
+ * resolved yet, or possibly that the symbol has been defined as
+ * contained in a dynamic [load time/run time] linked library.
+ *
+ * segment = -1 => not yet defined
+ * segment = -2 => defined as dll symbol
+ *
+ * If the symbol is already defined, and the new segment >= 0, then
+ * if the original segment was < 0 the symbol is redefined, otherwise
+ * a duplicate symbol warning is issued. If new segment == -1, this
+ * routine won't change a previously existing symbol. It will change
+ * to segment = -2 only if the segment was previously < 0.
+ */
+
+void symtab_add(const char * symbol, int segment, long offset)
+{
+ symtabEnt * ste;
+
+ ste = symtabFind(symtab, symbol);
+ if (ste)
+ {
+ if (ste->segment >= 0) {
+ /*
+ * symbol previously defined
+ */
+ if (segment < 0) return;
+ fprintf (error_file, "warning: `%s' redefined\n", symbol);
+ return;
+ }
+
+ /*
+ * somebody wanted the symbol, and put an undefined symbol
+ * marker into the table
+ */
+ if (segment == -1) return;
+ /*
+ * we have more information now - update the symbol's entry
+ */
+ ste->segment = segment;
+ ste->offset = offset;
+ ste->flags = 0;
+ return;
+ }
+ /*
+ * this is the first declaration of this symbol
+ */
+ ste = malloc(sizeof(symtabEnt));
+ if (!ste) {
+ fprintf(stderr, "ldrdf: out of memory\n");
+ exit(1);
+ }
+ ste->name = strdup(symbol);
+ ste->segment = segment;
+ ste->offset = offset;
+ ste->flags = 0;
+ symtabInsert(symtab, ste);
+}
+
+/*
+ * symtab_get()
+ *
+ * Retrieves the values associated with a symbol. Undefined symbols
+ * are assumed to have -1:0 associated. Returns 1 if the symbol was
+ * successfully located.
+ */
+
+int symtab_get(const char * symbol, int * segment, long * offset)
+{
+ symtabEnt * ste = symtabFind(symtab, symbol);
+ if (!ste) {
+ *segment = -1;
+ *offset = 0;
+ return 0;
+ }
+ else
+ {
+ *segment = ste->segment;
+ *offset = ste->offset;
+ return 1;
+ }
+}
+
+/*
+ * add_library()
+ *
+ * checks that a library can be opened and is in the correct format,
+ * then adds it to the linked list of libraries.
+ */
+
+void add_library(const char * name)
+{
+ if (rdl_verify(name)) {
+ rdl_perror("ldrdf", name);
+ errorcount++;
+ return;
+ }
+ if (! libraries)
+ {
+ lastlib = libraries = malloc(sizeof(*libraries));
+ if (! libraries) {
+ fprintf(stderr, "ldrdf: out of memory\n");
+ exit(1);
+ }
+ }
+ else
+ {
+ lastlib->next = malloc(sizeof(*libraries));
+ if (!lastlib->next) {
+ fprintf(stderr, "ldrdf: out of memory\n");
+ exit(1);
+ }
+ lastlib = lastlib->next;
+ }
+ lastlib->next = NULL;
+ if (rdl_open(lastlib, name)) {
+ rdl_perror("ldrdf", name);
+ errorcount++;
+ return;
+ }
+}
+
+/*
+ * search_libraries()
+ *
+ * scans through the list of libraries, attempting to match symbols
+ * defined in library modules against symbols that are referenced but
+ * not defined (segment = -1 in the symbol table)
+ *
+ * returns 1 if any extra library modules are included, indicating that
+ * another pass through the library list should be made (possibly).
+ */
+
+int search_libraries()
+{
+ struct librarynode * cur;
+ rdffile f;
+ int i;
+ void * header;
+ int segment;
+ long offset;
+ int doneanything = 0, pass = 1, keepfile;
+ rdfheaderrec * hr;
+
+ cur = libraries;
+
+ while (cur)
+ {
+ if (options.verbose > 2)
+ printf("scanning library `%s', pass %d...\n", cur->name, pass);
+
+ for (i = 0; rdl_openmodule(cur, i, &f) == 0; i++)
+ {
+ if (pass == 2 && lookformodule(f.name)) continue;
+
+ if (options.verbose > 3)
+ printf(" looking in module `%s'\n", f.name);
+
+ header = malloc(f.header_len);
+ if (!header) {
+ fprintf(stderr, "ldrdf: not enough memory\n");
+ exit(1);
+ }
+ if (rdfloadseg(&f, RDOFF_HEADER, header)) {
+ rdfperror("ldrdf", f.name);
+ errorcount++;
+ return 0;
+ }
+
+ keepfile = 0;
+
+ while ((hr = rdfgetheaderrec (&f)))
+ {
+ /* we're only interested in exports, so skip others: */
+ if (hr->type != 3) continue;
+
+ /*
+ * Find the symbol in the symbol table. If the symbol isn't
+ * defined, we aren't interested, so go on to the next.
+ * If it is defined as anything but -1, we're also not
+ * interested. But if it is defined as -1, insert this
+ * module into the list of modules to use, and go
+ * immediately on to the next module...
+ */
+ if (! symtab_get(hr->e.label, &segment, &offset)
+ || segment != -1)
+ {
+ continue;
+ }
+
+ doneanything = 1;
+ keepfile = 1;
+
+ /*
+ * as there are undefined symbols, we can assume that
+ * there are modules on the module list by the time
+ * we get here.
+ */
+ lastmodule->next = malloc(sizeof(*lastmodule->next));
+ if (!lastmodule->next) {
+ fprintf(stderr, "ldrdf: not enough memory\n");
+ exit(1);
+ }
+ lastmodule = lastmodule->next;
+ memcpy(&lastmodule->f, &f, sizeof(f));
+ lastmodule->name = strdup(f.name);
+ lastmodule->next = NULL;
+ processmodule(f.name, lastmodule);
+ break;
+ }
+ if (!keepfile)
+ {
+ free(f.name);
+ f.name = NULL;
+ f.fp = NULL;
+ }
+ }
+ if (rdl_error != 0 && rdl_error != RDL_ENOTFOUND)
+ rdl_perror("ldrdf", cur->name);
+
+ cur = cur->next;
+ if (cur == NULL && pass == 1) {
+ cur = libraries;
+ pass++;
+ }
+ }
+
+ return doneanything;
+}
+
+/*
+ * write_output()
+ *
+ * this takes the linked list of modules, and walks through it, merging
+ * all the modules into a single output module, and then writes this to a
+ * file.
+ */
+void write_output(const char * filename)
+{
+ FILE * f;
+ rdf_headerbuf * rdfheader;
+ struct modulenode * cur;
+ int i, availableseg, seg, localseg, isrelative;
+ void * header;
+ rdfheaderrec * hr, newrec;
+ symtabEnt * se;
+ segtab segs;
+ long offset;
+ byte * data;
+
+ if ((f = fopen(filename, "wb"))==NULL) {
+ fprintf(stderr, "ldrdf: couldn't open %s for output\n", filename);
+ exit(1);
+ }
+ if ((rdfheader=rdfnewheader())==NULL) {
+ fprintf(stderr, "ldrdf: out of memory\n");
+ exit(1);
+ }
+
+ /*
+ * Add multiboot header if appropriate option is specified.
+ * Multiboot record *MUST* be the first record in output file.
+ */
+ if (options.addMBheader) {
+ if (options.verbose)
+ puts("\nadding multiboot header record");
+
+ hr = (rdfheaderrec *) malloc(sizeof(struct MultiBootHdrRec));
+ hr->mbh.type = 9;
+ hr->mbh.reclen = sizeof(struct tMultiBootHeader)+RDFLDRMOVER_SIZE;
+
+ hr->mbh.mb.Magic = MB_MAGIC;
+ hr->mbh.mb.Flags = MB_FL_KLUDGE;
+ hr->mbh.mb.Checksum = ~(MB_MAGIC+MB_FL_KLUDGE-1);
+ hr->mbh.mb.HeaderAddr = MBHloadAddr+16;
+ hr->mbh.mb.LoadAddr = MBHloadAddr;
+ hr->mbh.mb.Entry = MBHloadAddr+16+sizeof(struct tMultiBootHeader);
+
+ memcpy(hr->mbh.mover,RDFloaderMover,RDFLDRMOVER_SIZE);
+
+ rdfaddheader(rdfheader,hr);
+ free(hr);
+ }
+
+ if (options.verbose)
+ printf ("\nbuilding output module (%d segments)\n", nsegs);
+
+ /*
+ * Allocate the memory for the segments. We may be better off
+ * building the output module one segment at a time when running
+ * under 16 bit DOS, but that would be a slower way of doing this.
+ * And you could always use DJGPP...
+ */
+ for (i = 0; i < nsegs; i++)
+ {
+ outputseg[i].data=NULL;
+ if(!outputseg[i].length) continue;
+ outputseg[i].data = malloc(outputseg[i].length);
+ if (!outputseg[i].data) {
+ fprintf(stderr, "ldrdf: out of memory\n");
+ exit(1);
+ }
+ }
+
+ /*
+ * initialise availableseg, used to allocate segment numbers for
+ * imported and exported labels...
+ */
+ availableseg = nsegs;
+
+ /*
+ * Step through the modules, performing required actions on each one
+ */
+ for (cur = modules; cur; cur=cur->next)
+ {
+ /*
+ * Read the actual segment contents into the correct places in
+ * the newly allocated segments
+ */
+
+ for (i = 0; i < cur->f.nsegs; i++)
+ {
+ int dest = cur->seginfo[i].dest_seg;
+
+ if (dest == -1) continue;
+ if (rdfloadseg(&cur->f, i,
+ outputseg[dest].data + cur->seginfo[i].reloc))
+ {
+ rdfperror("ldrdf", cur->name);
+ exit(1);
+ }
+ }
+
+ /*
+ * Perform fixups, and add new header records where required
+ */
+
+ header = malloc(cur->f.header_len);
+ if (!header) {
+ fprintf(stderr, "ldrdf: out of memory\n");
+ exit(1);
+ }
+
+ if (cur->f.header_loc)
+ rdfheaderrewind(&cur->f);
+ else
+ if (rdfloadseg(&cur->f, RDOFF_HEADER, header))
+ {
+ rdfperror("ldrdf", cur->name);
+ exit(1);
+ }
+
+ /*
+ * we need to create a local segment number -> location
+ * table for the segments in this module.
+ */
+ init_seglocations(&segs);
+ for (i = 0; i < cur->f.nsegs; i++)
+ {
+ add_seglocation(&segs, cur->f.seg[i].number,
+ cur->seginfo[i].dest_seg, cur->seginfo[i].reloc);
+ }
+ /*
+ * and the BSS segment (doh!)
+ */
+ add_seglocation (&segs, 2, 2, cur->bss_reloc);
+
+ while ((hr = rdfgetheaderrec(&cur->f)))
+ {
+ switch(hr->type) {
+ case 1: /* relocation record - need to do a fixup */
+ /*
+ * First correct the offset stored in the segment from
+ * the start of the segment (which may well have changed).
+ *
+ * To do this we add to the number stored the relocation
+ * factor associated with the segment that contains the
+ * target segment.
+ *
+ * The relocation could be a relative relocation, in which
+ * case we have to first subtract the amount we've relocated
+ * the containing segment by.
+ */
+
+ if (!get_seglocation(&segs, hr->r.refseg, &seg, &offset))
+ {
+ fprintf(stderr, "%s: reloc to undefined segment %04x\n",
+ cur->name, (int) hr->r.refseg);
+ errorcount++;
+ break;
+ }
+
+ isrelative = (hr->r.segment & 64) == 64;
+ hr->r.segment &= 63;
+
+ if (hr->r.segment == 2 ||
+ (localseg = rdffindsegment(&cur->f, hr->r.segment)) == -1)
+ {
+ fprintf(stderr, "%s: reloc from %s segment (%d)\n",
+ cur->name,
+ hr->r.segment == 2 ? "BSS" : "unknown",
+ hr->r.segment);
+ errorcount++;
+ break;
+ }
+
+ if (hr->r.length != 1 && hr->r.length != 2 && hr->r.length!=4)
+ {
+ fprintf(stderr, "%s: nonstandard length reloc "
+ "(%d bytes)\n", cur->name, hr->r.length);
+ errorcount++;
+ break;
+ }
+
+ /*
+ * okay, now the relocation is in the segment pointed to by
+ * cur->seginfo[localseg], and we know everything else is
+ * okay to go ahead and do the relocation
+ */
+ data = outputseg[cur->seginfo[localseg].dest_seg].data;
+ data += cur->seginfo[localseg].reloc + hr->r.offset;
+
+ /*
+ * data now points to the reference that needs
+ * relocation. Calculate the relocation factor.
+ * Factor is:
+ * offset of referred object in segment [in offset]
+ * (- relocation of localseg, if ref is relative)
+ * For simplicity, the result is stored in 'offset'.
+ * Then add 'offset' onto the value at data.
+ */
+
+ if (isrelative) offset -= cur->seginfo[localseg].reloc;
+ switch (hr->r.length)
+ {
+ case 1:
+ offset += *data;
+ if (offset < -127 || offset > 128)
+ fprintf(error_file, "warning: relocation out of range "
+ "at %s(%02x:%08lx)\n", cur->name,
+ (int)hr->r.segment, hr->r.offset);
+ *data = (char) offset;
+ break;
+ case 2:
+ offset += * (short *)data;
+ if (offset < -32767 || offset > 32768)
+ fprintf(error_file, "warning: relocation out of range "
+ "at %s(%02x:%08lx)\n", cur->name,
+ (int)hr->r.segment, hr->r.offset);
+ * (short *)data = (short) offset;
+ break;
+ case 4:
+ * (long *)data += offset;
+ /* we can't easily detect overflow on this one */
+ break;
+ }
+
+ /*
+ * If the relocation was relative between two symbols in
+ * the same segment, then we're done.
+ *
+ * Otherwise, we need to output a new relocation record
+ * with the references updated segment and offset...
+ */
+ if (! isrelative
+ || cur->seginfo[localseg].dest_seg != seg)
+ {
+ hr->r.segment = cur->seginfo[localseg].dest_seg;
+ hr->r.offset += cur->seginfo[localseg].reloc;
+ hr->r.refseg = seg;
+ rdfaddheader(rdfheader, hr);
+ }
+ break;
+
+ case 2: /* import symbol */
+ case 7:
+ /*
+ * scan the global symbol table for the symbol
+ * and associate its location with the segment number
+ * for this module
+ */
+ se = symtabFind(symtab, hr->i.label);
+ if (!se || se->segment == -1) {
+ if (options.warnUnresolved) {
+ fprintf(error_file, "warning: unresolved reference to `%s'"
+ " in module `%s'\n", hr->i.label, cur->name);
+ if (options.errorUnresolved==1) errorcount++;
+ }
+ /*
+ * we need to allocate a segment number for this
+ * symbol, and store it in the symbol table for
+ * future reference
+ */
+ if (!se) {
+ se=malloc(sizeof(*se));
+ if (!se) {
+ fprintf(stderr, "ldrdf: out of memory\n");
+ exit(1);
+ }
+ se->name = strdup(hr->i.label);
+ se->flags = 0;
+ se->segment = availableseg++;
+ se->offset = 0;
+ symtabInsert(symtab, se);
+ }
+ else {
+ se->segment = availableseg++;
+ se->offset = 0;
+ }
+ /*
+ * output a header record that imports it to the
+ * recently allocated segment number...
+ */
+ newrec = *hr;
+ newrec.i.segment = se->segment;
+ rdfaddheader(rdfheader, &newrec);
+ }
+
+ add_seglocation(&segs, hr->i.segment, se->segment, se->offset);
+
+ break;
+
+ case 3: /* export symbol */
+ /*
+ * need to insert an export for this symbol into the new
+ * header, unless we're stripping symbols [unless this
+ * symbol is in an explicit keep list]. *** FIXME ***
+ */
+ if (options.strip)
+ break;
+
+ if (hr->e.segment == 2) {
+ seg = 2;
+ offset = cur->bss_reloc;
+ }
+ else {
+ localseg = rdffindsegment(&cur->f, hr->e.segment);
+ if (localseg == -1) {
+ fprintf(stderr, "%s: exported symbol `%s' from "
+ "unrecognised segment\n", cur->name,
+ hr->e.label);
+ errorcount++;
+ break;
+ }
+ offset = cur->seginfo[localseg].reloc;
+ seg = cur->seginfo[localseg].dest_seg;
+ }
+
+ hr->e.segment = seg;
+ hr->e.offset += offset;
+ rdfaddheader(rdfheader, hr);
+ break;
+
+ case 8: /* module name */
+ /*
+ * insert module name record if export symbols
+ * are not stripped.
+ */
+ if (options.strip) break;
+
+ rdfaddheader(rdfheader, hr);
+ break;
+
+ case 6: /* segment fixup */
+ /*
+ * modify the segment numbers if necessary, and
+ * pass straight through to the output module header
+ *
+ * *** FIXME ***
+ */
+ if (hr->r.segment == 2) {
+ fprintf(stderr, "%s: segment fixup in BSS section\n",
+ cur->name);
+ errorcount++;
+ break;
+ }
+ localseg = rdffindsegment(&cur->f, hr->r.segment);
+ if (localseg == -1) {
+ fprintf(stderr, "%s: segment fixup in unrecognised"
+ " segment (%d)\n", cur->name, hr->r.segment);
+ errorcount++;
+ break;
+ }
+ hr->r.segment = cur->seginfo[localseg].dest_seg;
+ hr->r.offset += cur->seginfo[localseg].reloc;
+
+ if (!get_seglocation(&segs, hr->r.refseg, &seg, &offset))
+ {
+ fprintf(stderr, "%s: segment fixup to undefined "
+ "segment %04x\n", cur->name, (int)hr->r.refseg);
+ errorcount++;
+ break;
+ }
+ hr->r.refseg = seg;
+ rdfaddheader(rdfheader, hr);
+ break;
+ }
+ }
+
+ free(header);
+ done_seglocations(&segs);
+
+ }
+
+ /*
+ * combined BSS reservation for the entire results
+ */
+ newrec.type = 5;
+ newrec.b.reclen = 4;
+ newrec.b.amount = bss_length;
+ rdfaddheader(rdfheader, &newrec);
+
+ /*
+ * Write the header
+ */
+ for (i = 0; i < nsegs; i++)
+ {
+ if (i == 2) continue;
+ rdfaddsegment (rdfheader, outputseg[i].length);
+ }
+
+ if (options.addMBheader) {
+ struct MultiBootHdrRec *mbhrec = (struct MultiBootHdrRec *)(rdfheader->buf->buffer);
+ unsigned l = membuflength(rdfheader->buf) + 14 +
+ 10*rdfheader->nsegments + rdfheader->seglength;
+ unsigned *ldraddr = (unsigned *)(mbhrec->mover+1);
+
+ mbhrec->mb.LoadEndAddr = MBHloadAddr+l+10+RDFLDR_LENGTH;
+ mbhrec->mb.BSSendAddr = mbhrec->mb.LoadEndAddr;
+ *ldraddr = MBHloadAddr+l+10;
+ }
+
+ rdfwriteheader(f, rdfheader);
+ rdfdoneheader(rdfheader);
+ /*
+ * Step through the segments, one at a time, writing out into
+ * the output file
+ */
+
+ for (i = 0; i < nsegs; i++)
+ {
+ int16 s;
+ long l;
+
+ if (i == 2) continue;
+
+ s = translateshort(outputseg[i].type);
+ fwrite(&s, 2, 1, f);
+ s = translateshort(outputseg[i].number);
+ fwrite(&s, 2, 1, f);
+ s = translateshort(outputseg[i].reserved);
+ fwrite(&s, 2, 1, f);
+ l = translatelong(outputseg[i].length);
+ fwrite(&l, 4, 1, f);
+
+ fwrite(outputseg[i].data, outputseg[i].length, 1, f);
+ }
+
+ fwrite("\0\0\0\0\0\0\0\0\0\0", 10, 1, f);
+}
+
+/* =========================================================================
+ * Main program
+ */
+
+void usage()
+{
+ printf("usage:\n");
+ printf(" ldrdf [options] object modules ... [-llibrary ...]\n");
+ printf(" ldrdf -r\n");
+ printf("options:\n");
+ printf(" -v[=n] increases verbosity by 1, or sets it to n\n");
+ printf(" -a nn sets segment alignment value (default 16)\n");
+ printf(" -s strips exported symbols\n");
+ printf(" -x warn about unresolved symbols\n");
+ printf(" -o name write output in file 'name'\n");
+ printf(" -j path specify objects search path\n");
+ printf(" -L path specify libraries search path\n");
+ printf(" -mbh [address] add multiboot header to output file. Default\n");
+ printf(" loading address is 0x110000\n");
+ exit(0);
+}
+
+int main(int argc, char ** argv)
+{
+ char * outname = "aout.rdf";
+ int moduleloaded = 0;
+ char *respstrings[128] = {0, };
+
+ options.verbose = 0;
+ options.align = 16;
+ options.warnUnresolved = 0;
+ options.strip = 0;
+
+ error_file = stderr;
+
+ argc --, argv ++;
+ if (argc == 0) usage();
+ while (argc && **argv == '-' && argv[0][1] != 'l')
+ {
+ switch(argv[0][1]) {
+ case 'r':
+ printf("ldrdf (linker for RDF files) version " LDRDF_VERSION "\n");
+ printf( _RDOFF_H "\n");
+ exit(0);
+ case 'v':
+ if (argv[0][2] == '=') {
+ options.verbose = argv[0][3] - '0';
+ if (options.verbose < 0 || options.verbose > 9) {
+ fprintf(stderr, "ldrdf: verbosity level must be a number"
+ " between 0 and 9\n");
+ exit(1);
+ }
+ }
+ else
+ options.verbose++;
+ break;
+ case 'a':
+ options.align = atoi(argv[1]);
+ if (options.align <= 0) {
+ fprintf(stderr,
+ "ldrdf: -a expects a positive number argument\n");
+ exit(1);
+ }
+ argv++, argc--;
+ break;
+ case 's':
+ options.strip = 1;
+ break;
+ case 'x':
+ options.warnUnresolved = 1;
+ if (argv[0][2]=='e')
+ options.errorUnresolved = 1;
+ break;
+ case 'o':
+ outname = argv[1];
+ argv++, argc--;
+ break;
+ case 'j':
+ if (!objpath)
+ {
+ options.objpath = 1;
+ objpath = argv[1];
+ argv++, argc--;
+ break;
+ }
+ else
+ {
+ fprintf(stderr,"ldrdf: more than one objects search path specified\n");
+ exit(1);
+ }
+ case 'L':
+ if (!libpath)
+ {
+ options.libpath = 1;
+ libpath = argv[1];
+ argv++, argc--;
+ break;
+ }
+ else
+ {
+ fprintf(stderr,"ldrdf: more than one libraries search path specified\n");
+ exit(1);
+ }
+ case '@': {
+ int i=0;
+ char buf[256];
+ FILE *f;
+
+ options.respfile = 1;
+ if (argv[1] != NULL) f = fopen(argv[1],"r");
+ else
+ {
+ fprintf(stderr,"ldrdf: no response file name specified\n");
+ exit(1);
+ }
+
+ if (f == NULL)
+ {
+ fprintf(stderr,"ldrdf: unable to open response file\n");
+ exit(1);
+ }
+ argc-=2;
+ while(fgets(buf,sizeof(buf)-1,f)!=NULL)
+ {
+ char *p;
+ if (buf[0]=='\n') continue;
+ if ((p = strchr(buf,'\n')) != 0)
+ *p=0;
+ if (i >= 128)
+ {
+ fprintf(stderr,"ldrdf: too many input files\n");
+ exit(1);
+ }
+ *(respstrings+i) = newstr(buf);
+ argc++, i++;
+ }
+ goto done;
+ }
+ case '2':
+ options.stderr_redir = 1;
+ error_file = stdout;
+ break;
+ case 'm':
+ if (argv[0][2] == 'b' && argv[0][3] == 'h') {
+ if (argv[1][0] != '-') {
+ MBHloadAddr = atoi(argv[1]);
+ } else {
+ MBHloadAddr = MB_DEFAULTLOADADDR;
+ }
+ options.addMBheader = 1;
+ break;
+ }
+ default:
+ usage();
+ }
+ argv++, argc--;
+ }
+done:
+ if (options.verbose > 4) {
+ printf("ldrdf invoked with options:\n");
+ printf(" section alignment: %d bytes\n", options.align);
+ printf(" output name: `%s'\n", outname);
+ if (options.strip)
+ printf(" strip symbols\n");
+ if (options.warnUnresolved)
+ printf(" warn about unresolved symbols\n");
+ if (options.errorUnresolved)
+ printf(" error if unresolved symbols\n");
+ if (options.objpath)
+ printf(" objects search path: %s\n",objpath);
+ if (options.libpath)
+ printf(" libraries search path: %s\n",libpath);
+ if (options.addMBheader)
+ printf(" loading address for multiboot header: 0x%X\n",MBHloadAddr);
+ printf("\n");
+ }
+
+ symtab = symtabNew();
+ initsegments();
+
+ if (!symtab) {
+ fprintf(stderr, "ldrdf: out of memory\n");
+ exit(1);
+ }
+
+ if (*respstrings) argv = respstrings;
+ while (argc)
+ {
+ if (!strncmp(*argv, "-l", 2)) /* library */
+ {
+ if(libpath) add_library(newstrcat(libpath,*argv + 2));
+ else add_library(*argv + 2);
+ }
+ else {
+ if(objpath) loadmodule(newstrcat(objpath,*argv));
+ else loadmodule(*argv);
+ moduleloaded = 1;
+ }
+ argv++, argc--;
+ }
+
+ if (! moduleloaded) {
+ printf("ldrdf: nothing to do. ldrdf -h for usage\n");
+ return 0;
+ }
+
+
+ search_libraries();
+
+ if (options.verbose > 2)
+ {
+ printf ("symbol table:\n");
+ symtabDump(symtab, stdout);
+ }
+
+ write_output(outname);
+
+ if (errorcount > 0) exit(1);
+ return 0;
+}
-***************
-*** 9,15 ****
- * as acknowledgement is given in an appropriate manner to its authors,
- * with instructions of how to obtain a copy via ftp.
- */
--
- #ifndef _RDOFF_H
- #define _RDOFF_H "RDOFF2 support routines v0.3"
-
---- 9,15 ----
- * as acknowledgement is given in an appropriate manner to its authors,
- * with instructions of how to obtain a copy via ftp.
- */
-+
- #ifndef _RDOFF_H
- #define _RDOFF_H "RDOFF2 support routines v0.3"
-
-***************
-*** 48,54 ****
- struct ExportRec {
- byte type; /* must be 3 */
- byte reclen; /* content length */
-- byte segment; /* segment referred to (0/1) */
- long offset; /* offset within segment */
- char label[33]; /* zero terminated as above. max len = 32 chars */
- };
---- 48,54 ----
- struct ExportRec {
- byte type; /* must be 3 */
- byte reclen; /* content length */
-+ byte segment; /* segment referred to (0/1/2) */
- long offset; /* offset within segment */
- char label[33]; /* zero terminated as above. max len = 32 chars */
- };
-***************
-*** 65,70 ****
- long amount; /* number of bytes BSS to reserve */
- };
-
- /* GenericRec - contains the type and length field, plus a 128 byte
- char array 'data', which will probably never be used! */
-
---- 65,92 ----
- long amount; /* number of bytes BSS to reserve */
- };
-
-+ struct ModRec {
-+ byte type; /* must be 8 */
-+ byte reclen; /* content length */
-+ char modname[128]; /* module name */
-+ };
-+
-+ #ifdef _MULTBOOT_H
-+
-+ #define RDFLDRMOVER_SIZE 22
-+
-+ struct MultiBootHdrRec {
-+ byte type; /* must be 9 */
-+ byte reclen; /* content length */
-+ #ifdef __GNUC__
-+ struct tMultiBootHeader mb __attribute__ ((packed)); /* MultiBoot header */
-+ #else
-+ struct tMultiBootHeader mb;
-+ #endif
-+ byte mover[RDFLDRMOVER_SIZE]; /* Mover of RDF loader */
-+ };
-+ #endif
-+
- /* GenericRec - contains the type and length field, plus a 128 byte
- char array 'data', which will probably never be used! */
-
-***************
-*** 82,87 ****
- struct ExportRec e; /* type == 3 */
- struct DLLRec d; /* type == 4 */
- struct BSSRec b; /* type == 5 */
- } rdfheaderrec;
-
- struct SegmentHeaderRec {
---- 104,113 ----
- struct ExportRec e; /* type == 3 */
- struct DLLRec d; /* type == 4 */
- struct BSSRec b; /* type == 5 */
-+ struct ModRec m; /* type == 8 */
-+ #ifdef _MULTBOOT_H
-+ struct MultiBootHdrRec mbh; /* type == 9 */
-+ #endif
- } rdfheaderrec;
-
- struct SegmentHeaderRec {
-***************
-*** 166,170 ****
- int rdfaddsegment(rdf_headerbuf *h, long seglength);
- int rdfwriteheader(FILE *fp,rdf_headerbuf *h);
- void rdfdoneheader(rdf_headerbuf *h);
-
- #endif /* _RDOFF_H */
---- 192,199 ----
- int rdfaddsegment(rdf_headerbuf *h, long seglength);
- int rdfwriteheader(FILE *fp,rdf_headerbuf *h);
- void rdfdoneheader(rdf_headerbuf *h);
-+
-+ /* This is needed by linker to write multiboot header record */
-+ int membuflength(memorybuffer *b);
-
- #endif /* _RDOFF_H */
+/* rdoff.h RDOFF Object File manipulation routines header file
+ *
+ * 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.
+ *
+ * Permission to use this file in your own projects is granted, as long
+ * as acknowledgement is given in an appropriate manner to its authors,
+ * with instructions of how to obtain a copy via ftp.
+ */
+
+#ifndef _RDOFF_H
+#define _RDOFF_H "RDOFF2 support routines v0.3"
+
+/* Some systems don't define this automatically */
+extern char *strdup(const char *);
+
+typedef unsigned short int16;
+typedef unsigned char byte;
+
+#define RDF_MAXSEGS 64
+
+/* the records that can be found in the RDOFF header */
+
+struct RelocRec {
+ byte type; /* must be 1 */
+ byte reclen; /* content length */
+ byte segment; /* only 0 for code, or 1 for data supported,
+ but add 64 for relative refs (ie do not require
+ reloc @ loadtime, only linkage) */
+ long offset; /* from start of segment in which reference is loc'd */
+ byte length; /* 1 2 or 4 bytes */
+ int16 refseg; /* segment to which reference refers to */
+};
+
+struct ImportRec {
+ byte type; /* must be 2 */
+ byte reclen; /* content length */
+ int16 segment; /* segment number allocated to the label for reloc
+ records - label is assumed to be at offset zero
+ in this segment, so linker must fix up with offset
+ of segment and of offset within segment */
+ char label[33]; /* zero terminated... should be written to file until
+ the zero, but not after it - max len = 32 chars */
+};
+
+struct ExportRec {
+ byte type; /* must be 3 */
+ byte reclen; /* content length */
+ byte segment; /* segment referred to (0/1/2) */
+ long offset; /* offset within segment */
+ char label[33]; /* zero terminated as above. max len = 32 chars */
+};
+
+struct DLLRec {
+ byte type; /* must be 4 */
+ byte reclen; /* content length */
+ char libname[128]; /* name of library to link with at load time */
+};
+
+struct BSSRec {
+ byte type; /* must be 5 */
+ byte reclen; /* content length */
+ long amount; /* number of bytes BSS to reserve */
+};
+
+struct ModRec {
+ byte type; /* must be 8 */
+ byte reclen; /* content length */
+ char modname[128]; /* module name */
+};
+
+#ifdef _MULTBOOT_H
+
+#define RDFLDRMOVER_SIZE 22
+
+struct MultiBootHdrRec {
+ byte type; /* must be 9 */
+ byte reclen; /* content length */
+#ifdef __GNUC__
+ struct tMultiBootHeader mb __attribute__ ((packed)); /* MultiBoot header */
+#else
+ struct tMultiBootHeader mb;
+#endif
+ byte mover[RDFLDRMOVER_SIZE]; /* Mover of RDF loader */
+};
+#endif
+
+/* GenericRec - contains the type and length field, plus a 128 byte
+ char array 'data', which will probably never be used! */
+
+struct GenericRec {
+ byte type;
+ byte reclen;
+ char data[128];
+};
+
+typedef union RDFHeaderRec {
+ char type; /* invariant throughout all below */
+ struct GenericRec g;
+ struct RelocRec r; /* type == 1 / 6 */
+ struct ImportRec i; /* type == 2 / 7 */
+ struct ExportRec e; /* type == 3 */
+ struct DLLRec d; /* type == 4 */
+ struct BSSRec b; /* type == 5 */
+ struct ModRec m; /* type == 8 */
+#ifdef _MULTBOOT_H
+ struct MultiBootHdrRec mbh; /* type == 9 */
+#endif
+} rdfheaderrec;
+
+struct SegmentHeaderRec {
+ /* information from file */
+ int16 type;
+ int16 number;
+ int16 reserved;
+ long length;
+
+ /* information built up here */
+ long offset;
+ byte *data; /* pointer to segment data if it exists in memory */
+};
+
+typedef struct RDFFileInfo {
+ FILE *fp; /* file descriptor; must be open to use this struct */
+ int rdoff_ver; /* should be 1; any higher => not guaranteed to work */
+ long header_len;
+ long header_ofs;
+
+ byte *header_loc; /* keep location of header */
+ long header_fp; /* current location within header for reading */
+
+ struct SegmentHeaderRec seg[RDF_MAXSEGS];
+ int nsegs;
+
+ long eof_offset; /* offset of the first byte beyond the end of this
+ module */
+
+ char *name; /* name of module in libraries */
+ int *refcount; /* pointer to reference count on file, or NULL */
+} rdffile;
+
+#define BUF_BLOCK_LEN 4088 /* selected to match page size (4096)
+ * on 80x86 machines for efficiency */
+typedef struct memorybuffer {
+ int length;
+ byte buffer[BUF_BLOCK_LEN];
+ struct memorybuffer *next;
+} memorybuffer;
+
+typedef struct {
+ memorybuffer * buf; /* buffer containing header records */
+ int nsegments; /* number of segments to be written */
+ long seglength; /* total length of all the segments */
+} rdf_headerbuf;
+
+/* segments used by RDOFF, understood by rdoffloadseg */
+#define RDOFF_CODE 0
+#define RDOFF_DATA 1
+#define RDOFF_HEADER -1
+/* mask for 'segment' in relocation records to find if relative relocation */
+#define RDOFF_RELATIVEMASK 64
+/* mask to find actual segment value in relocation records */
+#define RDOFF_SEGMENTMASK 63
+
+extern int rdf_errno;
+
+/* utility functions */
+int16 translateshort(int16 in);
+long translatelong(long in);
+
+/* RDOFF file manipulation functions */
+int rdfopen(rdffile *f,const char *name);
+int rdfopenhere(rdffile *f, FILE *fp, int *refcount, const char *name);
+int rdfclose(rdffile *f);
+int rdffindsegment(rdffile * f, int segno);
+int rdfloadseg(rdffile *f,int segment,void *buffer);
+rdfheaderrec *rdfgetheaderrec(rdffile *f); /* returns static storage */
+void rdfheaderrewind(rdffile *f); /* back to start of header */
+void rdfperror(const char *app,const char *name);
+
+/* functions to write a new RDOFF header to a file -
+ use rdfnewheader to allocate a header, rdfaddheader to add records to it,
+ rdfaddsegment to notify the header routines that a segment exists, and
+ to tell it how long the segment will be.
+ rdfwriteheader to write the file id, object length, and header
+ to a file, and then rdfdoneheader to dispose of the header */
+
+rdf_headerbuf *rdfnewheader(void);
+int rdfaddheader(rdf_headerbuf *h,rdfheaderrec *r);
+int rdfaddsegment(rdf_headerbuf *h, long seglength);
+int rdfwriteheader(FILE *fp,rdf_headerbuf *h);
+void rdfdoneheader(rdf_headerbuf *h);
+
+/* This is needed by linker to write multiboot header record */
+int membuflength(memorybuffer *b);
+
+#endif /* _RDOFF_H */
projects / platform / upstream / nasm.git / commitdiff