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[dragonfly.git] / gnu / usr.bin / ld / rrs.c

/*
 * Copyright (c) 1993 Paul Kranenburg
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Paul Kranenburg.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * $FreeBSD: src/gnu/usr.bin/ld/rrs.c,v 1.24 1999/08/27 23:36:01 peter Exp $
 * $DragonFly: src/gnu/usr.bin/ld/Attic/rrs.c,v 1.2 2003/06/17 04:25:46 dillon Exp $
 */

#include <sys/param.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <err.h>
#include <fcntl.h>
#include <ar.h>
#include <ranlib.h>
#include <a.out.h>
#include <stab.h>
#include <string.h>

#include "ld.h"
#include "dynamic.h"

static struct _dynamic          rrs_dyn;                /* defined in link.h */
static struct so_debug          rrs_so_debug;           /* defined in link.h */
static struct section_dispatch_table    rrs_sdt;        /* defined in link.h */
static got_t                    *rrs_got;
static jmpslot_t                *rrs_plt;               /* defined in md.h */
static struct relocation_info   *rrs_reloc;
static struct nzlist            *rrs_symbols;           /* RRS symbol table */
static char                     *rrs_strtab;            /* RRS strings */
static struct rrs_hash          *rrs_hashtab;           /* RT hash table */
static struct shobj             *rrs_shobjs;
char                            *rrs_search_paths;      /* `-L' RT search */
static int                      rrs_search_paths_size;

static int      reserved_rrs_relocs;
static int      claimed_rrs_relocs;
static int      discarded_rrs_relocs;

static int      number_of_gotslots = 1;
static int      number_of_jmpslots = 1;
static int      number_of_rrs_hash_entries;
static int      number_of_rrs_symbols;
static int      rrs_strtab_size;
static int      rrs_symbol_size;

static int      current_jmpslot_offset;
static int      current_got_offset;
static int      max_got_offset;
static int      min_got_offset;
static int      got_origin;
static int      current_reloc_offset;
static int      current_hash_index;
int             number_of_shobjs;

/* Convert a GOT offset into a table entry */
#define GOTP(off)               ((got_t *)((long)rrs_got + got_origin + (off)))

struct shobj {
        struct shobj            *next;
        struct file_entry       *entry;
};

/*
RRS text segment:
                +-------------------+  <-- sdt_rel (rrs_text_start)
                |                   |
                |    relocation     |
                |                   |
                +-------------------+  <-- <sdt>.sdt_hash
                |                   |
                |    hash buckets   |
                |                   |
                +-------------------+  <-- <sdt>.sdt_nzlist
                |                   |
                |     symbols       |
                |                   |
                +-------------------+  <-- <sdt>.sdt_strings
                |                   |
                |     strings       |
                |                   |
                +-------------------+  <-- <sdt>.sdt_sods
                |                   |
                |     shobjs        |
                |                   |
                +-------------------+
                |                   |
                |  shobjs strings   |  <-- <shobj>.sod_name
                |                   |
                +-------------------+


RRS data segment:

                +-------------------+  <-- __DYNAMIC (rrs_data_start)
                |                   |
                |     _dymamic      |
                |                   |
                +-------------------+  <-- __DYNAMIC.d_debug
                |                   |
                |    so_debug       |
                |                   |
                +-------------------+  <-- __DYNAMIC.d_un.d_sdt
                |                   |
                |       sdt         |
                |                   |
                +-------------------+  <-- sdt_got
                |                   |
                |      _GOT_        |  <-- _GLOBAL_OFFSET_TABLE_
                |                   |           ( == sdt_got + got_origin)
                |                   |
                +-------------------+  <-- sdt_plt
                |                   |
                |       PLT         |
                |                   |
                +-------------------+
*/

/*
 * Add NAME to the list of needed run-time objects.
 * Return 1 if ENTRY was added to the list.
 */
int
rrs_add_shobj(entry)
        struct file_entry       *entry;
{
        struct shobj    **p;

        for (p = &rrs_shobjs; *p != NULL; p = &(*p)->next)
                if (strcmp((*p)->entry->filename, entry->filename) == 0)
                        return 0;
        *p = (struct shobj *)xmalloc(sizeof(struct shobj));
        (*p)->next = NULL;
        (*p)->entry = entry;

        number_of_shobjs++;
        return 1;
}

void
alloc_rrs_reloc(entry, sp)
        struct file_entry       *entry;
        symbol                  *sp;
{
#ifdef DEBUG
printf("alloc_rrs_reloc: %s in %s\n", demangle(sp->name), get_file_name(entry));
#endif
        reserved_rrs_relocs++;
}

void
alloc_rrs_segment_reloc(entry, r)
        struct file_entry       *entry;
        struct relocation_info  *r;
{
#ifdef DEBUG
printf("alloc_rrs_segment_reloc at %#x in %s\n",
        r->r_address, get_file_name(entry));
#endif
        reserved_rrs_relocs++;
}

void
alloc_rrs_jmpslot(entry, sp)
        struct file_entry       *entry;
        symbol                  *sp;
{
        if (sp->flags & GS_HASJMPSLOT)
                return;

        sp->flags |= GS_HASJMPSLOT;
        number_of_jmpslots++;
        reserved_rrs_relocs++;
}

void
alloc_rrs_gotslot(entry, r, lsp)
        struct file_entry       *entry;
        struct relocation_info  *r;
        struct localsymbol      *lsp;
{
        symbol  *sp = lsp->symbol;

        if (!RELOC_EXTERN_P(r)) {

                if (sp != NULL) {
                        warnx("%s: relocation for internal symbol "
                              "expected at %#x",
                              get_file_name(entry), RELOC_ADDRESS(r));
                        return;
                }

                if (!RELOC_STATICS_THROUGH_GOT_P(r))
                        /* No need for a GOT slot */
                        return;

                if (lsp->flags & LS_HASGOTSLOT)
                        return;

                lsp->flags |= LS_HASGOTSLOT;

        } else {

                if (sp == NULL) {
                        warnx("%s: relocation must refer "
                              "to global symbol at %#x",
                              get_file_name(entry), RELOC_ADDRESS(r));
                        return;
                }

                if (sp->alias)
                        sp = sp->alias;

                if (sp->flags & GS_HASGOTSLOT)
                        return;

                sp->flags |= GS_HASGOTSLOT;
        }

        number_of_gotslots++;
        reserved_rrs_relocs++;
}

void
alloc_rrs_cpy_reloc(entry, sp)
        struct file_entry       *entry;
        symbol                  *sp;
{
        if (sp->flags & GS_CPYRELOCRESERVED)
                return;
#ifdef DEBUG
printf("alloc_rrs_copy: %s in %s\n", demangle(sp->name), get_file_name(entry));
#endif
        sp->flags |= GS_CPYRELOCRESERVED;
        reserved_rrs_relocs++;
}

static struct relocation_info *
rrs_next_reloc()
{
        struct relocation_info  *r;

        r = rrs_reloc + claimed_rrs_relocs++;
        if (claimed_rrs_relocs > reserved_rrs_relocs)
                errx(1, "internal error: RRS relocs exceed allocation %d",
                        reserved_rrs_relocs);
        return r;
}

/*
 * Claim a RRS relocation as a result of a regular (ie. non-PIC)
 * relocation record in a rel file.
 *
 * Return 1 if the output file needs no further updating.
 * Return 0 if the relocation value pointed to by RELOCATION must
 * written to a.out.
 */
int
claim_rrs_reloc(entry, rp, sp, relocation)
        struct file_entry       *entry;
        struct relocation_info  *rp;
        symbol                  *sp;
        long                    *relocation;
{
        struct relocation_info  *r = rrs_next_reloc();

        if (rp->r_address < text_start + text_size
            && (link_mode & WARNRRSTEXT))
                warnx("%s: RRS text relocation at %#x for \"%s\"",
                        get_file_name(entry), rp->r_address, demangle(sp->name));

#ifdef DEBUG
printf("claim_rrs_reloc: %s in %s\n", demangle(sp->name), get_file_name(entry));
#endif
        r->r_address = rp->r_address;
        r->r_symbolnum = sp->rrs_symbolnum;

        if (link_mode & SYMBOLIC) {
                if (!sp->defined)
                        warnx("Cannot reduce symbol \"%s\" in %s",
                                demangle(sp->name), get_file_name(entry));
                RELOC_EXTERN_P(r) = 0;
                *relocation += sp->value;
                (void) md_make_reloc(rp, r, RELTYPE_RELATIVE);
                return 0;
        } else {
                RELOC_EXTERN_P(r) = 1;
                return md_make_reloc(rp, r, RELTYPE_EXTERN);
        }
}

/*
 * Claim a jmpslot. Setup RRS relocation if claimed for the first time.
 */
long
claim_rrs_jmpslot(entry, rp, sp, addend)
        struct file_entry       *entry;
        struct relocation_info  *rp;
        symbol                  *sp;
        long                    addend;
{
        struct relocation_info *r;

        if (!(sp->flags & GS_HASJMPSLOT))
                errx(1, "internal error: "
                        "%s: claim_rrs_jmpslot: %s: no reservation",
                        get_file_name(entry),
                        demangle(sp->name));

        if (sp->jmpslot_offset != -1)
                return rrs_sdt.sdt_plt + sp->jmpslot_offset;

        sp->jmpslot_offset = current_jmpslot_offset;
        current_jmpslot_offset += sizeof(jmpslot_t);

#ifdef DEBUG
printf("claim_rrs_jmpslot: %s: %s(%d) -> offset %x\n",
        get_file_name(entry),
        demangle(sp->name), sp->rrs_symbolnum, sp->jmpslot_offset);
#endif

        if ((link_mode & SYMBOLIC) || rrs_section_type == RRS_PARTIAL) {
                if (!sp->defined)
                        warnx("Cannot reduce symbol \"%s\" in %s",
                                demangle(sp->name), get_file_name(entry));

                md_fix_jmpslot( rrs_plt + sp->jmpslot_offset/sizeof(jmpslot_t),
                                rrs_sdt.sdt_plt + sp->jmpslot_offset,
                                sp->value);
                if (rrs_section_type == RRS_PARTIAL || !JMPSLOT_NEEDS_RELOC) {
                        /* PLT is self-contained */
                        discarded_rrs_relocs++;
                        return rrs_sdt.sdt_plt + sp->jmpslot_offset;
                }
        } else {
                md_make_jmpslot(rrs_plt + sp->jmpslot_offset/sizeof(jmpslot_t),
                                sp->jmpslot_offset,
                                claimed_rrs_relocs);
        }

        /*
         * Install a run-time relocation for this PLT entry.
         */
        r = rrs_next_reloc();

        RELOC_SYMBOL(r) = sp->rrs_symbolnum;

        r->r_address = (long)rrs_sdt.sdt_plt + sp->jmpslot_offset;

        if (link_mode & SYMBOLIC) {
                RELOC_EXTERN_P(r) = 0;
                md_make_jmpreloc(rp, r, RELTYPE_RELATIVE);
        } else {
                RELOC_EXTERN_P(r) = 1;
                md_make_jmpreloc(rp, r, 0);
        }

        return rrs_sdt.sdt_plt + sp->jmpslot_offset;
}

/*
 * Claim GOT entry for a global symbol. If this is the first relocation
 * claiming the entry, setup a RRS relocation for it.
 * Return offset into the GOT allocated to this symbol.
 */
long
claim_rrs_gotslot(entry, rp, lsp, addend)
        struct file_entry       *entry;
        struct relocation_info  *rp;
        struct localsymbol      *lsp;
        long                    addend;
{
        struct relocation_info  *r;
        symbol  *sp = lsp->symbol;
        int     reloc_type = 0;

        if (sp == NULL) {
                return 0;
        }

        if (sp->alias)
                sp = sp->alias;

        if (!(sp->flags & GS_HASGOTSLOT))
                errx(1, "internal error: "
                        "%s: claim_rrs_gotslot: %s: no reservation",
                        get_file_name(entry), demangle(sp->name));

        if (sp->gotslot_offset != -1) {
#ifdef DIAGNOSTIC
                if (*GOTP(sp->gotslot_offset) != addend +
                    ((!(link_mode & SHAREABLE) || (link_mode & SYMBOLIC))
                       ? sp->value : 0))
                        errx(1, "%s: %s: gotslot at %#x is multiple valued, "
                                "*got = %#x, addend = %#x, sp->value = %#x",
                                get_file_name(entry), demangle(sp->name),
                                sp->gotslot_offset,
                                *GOTP(sp->gotslot_offset), addend, sp->value);
#endif
                /* This symbol already passed here before. */
                return sp->gotslot_offset;
        }

        if (current_got_offset == 0)
                /* GOT offset 0 is reserved */
                current_got_offset += sizeof(got_t);

        if (current_got_offset > max_got_offset)
                errx(1, "%s: GOT overflow on symbol `%s' at %#x",
                      get_file_name(entry), demangle(sp->name), RELOC_ADDRESS(rp));

        sp->gotslot_offset = current_got_offset;
        current_got_offset += sizeof(got_t);

#ifdef DEBUG
printf("claim_rrs_gotslot: %s(%d,%#x) slot offset %#x, addend %#x\n",
         demangle(sp->name), sp->rrs_symbolnum, sp->value, sp->gotslot_offset, addend);
#endif

        if (sp->defined &&
            (!(link_mode & SHAREABLE) || (link_mode & SYMBOLIC))) {

                /*
                 * Reduce to just a base-relative translation.
                 */

                *GOTP(sp->gotslot_offset) = sp->value + addend;
                reloc_type = RELTYPE_RELATIVE;

        } else if ((link_mode & SYMBOLIC) || rrs_section_type == RRS_PARTIAL) {
                /*
                 * SYMBOLIC: all symbols must be known.
                 * RRS_PARTIAL: we don't link against shared objects,
                 * so again all symbols must be known.
                 */
                warnx("Cannot reduce symbol \"%s\" in %s",
                      demangle(sp->name), get_file_name(entry));

        } else {

                /*
                 * This gotslot will be updated with symbol value at run-time.
                 */

                *GOTP(sp->gotslot_offset) = addend;
        }

        if (rrs_section_type == RRS_PARTIAL) {
                /*
                 * Base address is known, gotslot should be fully
                 * relocated by now.
                 * NOTE: RRS_PARTIAL implies !SHAREABLE.
                 */
                if (!sp->defined)
                        warnx("Cannot reduce symbol \"%s\" in %s",
                              demangle(sp->name), get_file_name(entry));
                discarded_rrs_relocs++;
                return sp->gotslot_offset;
        }

        /*
         * Claim a relocation entry.
         * If symbol is defined and in "main" (!SHAREABLE)
         * we still put out a relocation as we cannot easily
         * undo the allocation.
         * `RELTYPE_RELATIVE' relocations have the external bit off
         * as no symbol need be looked up at run-time.
         */
        r = rrs_next_reloc();
        r->r_address = got_symbol->value + sp->gotslot_offset;
        RELOC_SYMBOL(r) = sp->rrs_symbolnum;
        RELOC_EXTERN_P(r) = !(reloc_type == RELTYPE_RELATIVE);
        md_make_gotreloc(rp, r, reloc_type);

        return sp->gotslot_offset;
}

/*
 * Claim a GOT entry for a static symbol. Return offset of the
 * allocated GOT entry. If RELOC_STATICS_THROUGH_GOT_P is in effect,
 * return the offset of the symbol with respect to the *location* of
 * the GOT.
 */
long
claim_rrs_internal_gotslot(entry, rp, lsp, addend)
        struct file_entry       *entry;
        struct relocation_info  *rp;
        struct localsymbol      *lsp;
        long                    addend;
{
        struct relocation_info  *r;

        addend += lsp->nzlist.nz_value;

        if (!RELOC_STATICS_THROUGH_GOT_P(r))
                return addend - got_symbol->value;

        if (!(lsp->flags & LS_HASGOTSLOT))
                errx(1, "internal error: "
                        "%s: claim_rrs_internal_gotslot at %#x: no reservation",
                        get_file_name(entry), RELOC_ADDRESS(rp));

        if (lsp->gotslot_offset != -1) {
                /* Already claimed */
                if (*GOTP(lsp->gotslot_offset) != addend)
                        errx(1, "%s: gotslot at %#lx is multiple valued",
                                get_file_name(entry), lsp->gotslot_offset);
                return lsp->gotslot_offset;
        }

        if (current_got_offset == 0)
                /* GOT offset 0 is reserved */
                current_got_offset += sizeof(got_t);

        if (current_got_offset > max_got_offset)
                errx(1, "%s: GOT overflow for relocation at %#x",
                      get_file_name(entry), RELOC_ADDRESS(rp));

        lsp->gotslot_offset = current_got_offset;
        current_got_offset += sizeof(got_t);

        *GOTP(lsp->gotslot_offset) = addend;

#ifdef DEBUG
printf("claim_rrs_internal_gotslot: %s: slot offset %#x, addend = %#x\n",
        get_file_name(entry), lsp->gotslot_offset, addend);
#endif

        if (rrs_section_type == RRS_PARTIAL) {
                discarded_rrs_relocs++;
                return lsp->gotslot_offset;
        }

        /*
         * Relocation entry needed for this static GOT entry.
         */
        r = rrs_next_reloc();
        r->r_address = got_symbol->value + lsp->gotslot_offset;
        RELOC_EXTERN_P(r) = 0;
        md_make_gotreloc(rp, r, RELTYPE_RELATIVE);
        return lsp->gotslot_offset;
}

void
claim_rrs_cpy_reloc(entry, rp, sp)
        struct file_entry       *entry;
        struct relocation_info  *rp;
        symbol                  *sp;
{
        struct relocation_info  *r;

        if (sp->flags & GS_CPYRELOCCLAIMED)
                return;

        if (!(sp->flags & GS_CPYRELOCRESERVED))
                errx(1, "internal error: "
                        "%s: claim_cpy_reloc: %s: no reservation",
                        get_file_name(entry), demangle(sp->name));

#ifdef DEBUG
printf("claim_rrs_copy: %s: %s -> %x\n",
        get_file_name(entry), demangle(sp->name), sp->so_defined);
#endif

        r = rrs_next_reloc();
        sp->flags |= GS_CPYRELOCCLAIMED;
        r->r_address = rp->r_address;
        RELOC_SYMBOL(r) = sp->rrs_symbolnum;
        RELOC_EXTERN_P(r) = RELOC_EXTERN_P(rp);
        md_make_cpyreloc(rp, r);
}

void
claim_rrs_segment_reloc(entry, rp)
        struct file_entry       *entry;
        struct relocation_info  *rp;
{
        struct relocation_info  *r = rrs_next_reloc();

#ifdef DEBUG
printf("claim_rrs_segment_reloc: %s at %#x\n",
        get_file_name(entry), rp->r_address);
#endif

        r->r_address = rp->r_address;
        RELOC_TYPE(r) = RELOC_TYPE(rp);
        RELOC_EXTERN_P(r) = 0;
        md_make_reloc(rp, r, RELTYPE_RELATIVE);

}

/*
 * Fill the RRS hash table for the given symbol name.
 * NOTE: the hash value computation must match the one in rtld.
 */
void
rrs_insert_hash(cp, index)
        char    *cp;
        int     index;
{
        int             hashval = 0;
        struct rrs_hash *hp;

        for (; *cp; cp++)
                hashval = (hashval << 1) + *cp;

        hashval = (hashval & 0x7fffffff) % rrs_sdt.sdt_buckets;

        /* Get to the bucket */
        hp = rrs_hashtab + hashval;
        if (hp->rh_symbolnum == -1) {
                /* Empty bucket, use it */
                hp->rh_symbolnum = index;
                hp->rh_next = 0;
                return;
        }

        while (hp->rh_next != 0)
                hp = rrs_hashtab + hp->rh_next;

        hp->rh_next = current_hash_index++;
        hp = rrs_hashtab + hp->rh_next;
        hp->rh_symbolnum = index;
        hp->rh_next = 0;
}

/*
 * There are two interesting cases to consider here.
 *
 * 1) No shared objects were loaded, but there were PIC input rel files.
 *    In this case we must output a _GLOBAL_OFFSET_TABLE_ but no other
 *    RRS data. Also, the entries in the GOT must be fully resolved.
 *
 * 2) It's a genuine dynamically linked program, so the whole RRS scoop
 *    goes into a.out.
 */
void
consider_rrs_section_lengths()
{
        int             n;
        struct shobj    *shp;

#ifdef notyet
        struct shobj    **shpp;
/* We run into trouble with this as long as shared object symbols
   are not checked for definitions */
        /*
         * First, determine the real number of shared objects we need.
         */
        for (shpp = &rrs_shobjs; *shpp; shpp = &(*shpp)->next) {
                while (*shpp && !((*shpp)->entry->flags & E_SYMBOLS_USED)) {
                        if (--number_of_shobjs < 0)
                                errx(1, "internal error: number_of_shobjs < 0");
                        *shpp = (*shpp)->next;
                }
                if (*shpp == NULL)
                        break;
        }
#endif

        /* First, determine what of the RRS we want */
        if (relocatable_output)
                rrs_section_type = RRS_NONE;
        else if (link_mode & SHAREABLE)
                rrs_section_type = RRS_FULL;
        else if (number_of_shobjs == 0 && !(link_mode & FORCEDYNAMIC)) {
                /*
                 * First slots in both tables are reserved
                 * hence the "> 1" condition
                 */
                if (number_of_gotslots > 1 || number_of_jmpslots > 1)
                        rrs_section_type = RRS_PARTIAL;
                else
                        rrs_section_type = RRS_NONE;
        } else
                rrs_section_type = RRS_FULL;

        if (rrs_section_type == RRS_NONE) {
                got_symbol->defined = 0;
                if (reserved_rrs_relocs > 0)
                        errx(1, "internal error: empty RRS has reservations");
                return;
        }

        rrs_symbol_size = LD_VERSION_NZLIST_P(soversion) ?
                        sizeof(struct nzlist) : sizeof(struct nlist);

        /*
         * If there is an entry point, __DYNAMIC must be referenced (usually
         * from crt0), as this is the method used to determine whether the
         * run-time linker must be called.
         */
        if (!(link_mode & SHAREABLE) && !(dynamic_symbol->flags & GS_REFERENCED))
                errx(1, "No reference to __DYNAMIC");

        dynamic_symbol->flags |= GS_REFERENCED;

        if (number_of_gotslots > 1)
                got_symbol->flags |= GS_REFERENCED;


        /* Next, allocate relocs, got and plt */
        n = reserved_rrs_relocs * sizeof(struct relocation_info);
        rrs_reloc = (struct relocation_info *)xmalloc(n);
        bzero(rrs_reloc, n);

        n = number_of_gotslots * sizeof(got_t);
        rrs_got = (got_t *)xmalloc(n);
        bzero(rrs_got, n);

        n = number_of_jmpslots * sizeof(jmpslot_t);
        rrs_plt = (jmpslot_t *)xmalloc(n);
        bzero(rrs_plt, n);

        /* Initialize first jmpslot */
        md_fix_jmpslot(rrs_plt, 0, 0);

        if (rrs_section_type == RRS_PARTIAL) {
                rrs_data_size = number_of_gotslots * sizeof(got_t);
                rrs_data_size += number_of_jmpslots * sizeof(jmpslot_t);
                return;
        }

        /*
         * Walk the symbol table, assign RRS symbol numbers
         * and calculate string space.
         * Assign number 0 to __DYNAMIC (!! Sun compatibility)
         */
        dynamic_symbol->rrs_symbolnum = number_of_rrs_symbols++;
        FOR_EACH_SYMBOL(i ,sp) {
                if ((link_mode & SHAREABLE) && sp->warning) {
                        /* Allocate N_WARNING & co */
                        rrs_strtab_size +=
                                2 + strlen(sp->name) + strlen(sp->warning);
                        number_of_rrs_symbols += 2;
                }

                if (!(sp->flags & GS_REFERENCED))
                        continue;

                rrs_strtab_size += 1 + strlen(sp->name);
                if (sp != dynamic_symbol)
                        sp->rrs_symbolnum = number_of_rrs_symbols++;
                if (sp->alias) {
                        /*
                         * (sigh) Always allocate space to hold the
                         * indirection. At this point there's not
                         * enough information to decide whether it's
                         * actually needed or not.
                         */
                        number_of_rrs_symbols++;
                        rrs_strtab_size += 1 + strlen(sp->alias->name);
                }
        } END_EACH_SYMBOL;

        /*
         * Now that we know how many RRS symbols there are going to be,
         * allocate and initialize the RRS symbol hash table.
         */
        rrs_sdt.sdt_buckets = number_of_rrs_symbols/4;
        if (rrs_sdt.sdt_buckets < 4)
                rrs_sdt.sdt_buckets = 4;

        number_of_rrs_hash_entries = rrs_sdt.sdt_buckets +
                                     number_of_rrs_symbols;
        rrs_hashtab = (struct rrs_hash *)xmalloc(
                        number_of_rrs_hash_entries * sizeof(struct rrs_hash));
        for (n = 0; n < rrs_sdt.sdt_buckets; n++)
                rrs_hashtab[n].rh_symbolnum = -1;
        current_hash_index = rrs_sdt.sdt_buckets;

        /*
         * Get symbols into hash table now, so we can fine tune the size
         * of the latter. We adjust the value of `number_of_rrs_hash_entries'
         * to the number of hash link slots actually used.
         */
        FOR_EACH_SYMBOL(i ,sp) {
                if (sp->flags & GS_REFERENCED)
                        rrs_insert_hash(sp->name, sp->rrs_symbolnum);
        } END_EACH_SYMBOL;
        number_of_rrs_hash_entries = current_hash_index;

        /*
         * Calculate RRS section sizes.
         */
        rrs_data_size = sizeof(struct _dynamic);
        rrs_data_size += sizeof(struct so_debug);
        rrs_data_size += sizeof(struct section_dispatch_table);
        rrs_data_size += number_of_gotslots * sizeof(got_t);
        rrs_data_size += number_of_jmpslots * sizeof(jmpslot_t);
        rrs_data_size = MALIGN(rrs_data_size);

        rrs_text_size = reserved_rrs_relocs * sizeof(struct relocation_info);
        rrs_text_size += number_of_rrs_hash_entries * sizeof(struct rrs_hash);
        rrs_text_size += number_of_rrs_symbols * rrs_symbol_size;
        rrs_search_paths_size = rrs_search_paths
                                        ? strlen(rrs_search_paths) + 1
                                        : 0;
        rrs_search_paths_size = MALIGN(rrs_search_paths_size);
        rrs_text_size += rrs_search_paths_size;

        /* Align strings size */
        rrs_strtab_size = MALIGN(rrs_strtab_size);
        rrs_text_size += rrs_strtab_size;

        /* Process needed shared objects */
        for (shp = rrs_shobjs; shp; shp = shp->next) {
                char    *name = shp->entry->local_sym_name;

                if (*name == '-' && *(name+1) == 'l')
                        name += 2;

                rrs_text_size += sizeof(struct sod);
                rrs_text_size += 1 + strlen(name);
        }

        /* Finally, align size */
        rrs_text_size = MALIGN(rrs_text_size);
}

void
relocate_rrs_addresses()
{
        int gotsize;

        dynamic_symbol->value = 0;

        /*
         * Get ready to allocate linkage table offsets.
         * First jmpslot is reserved for the run-time binder
         * GOT entry at offset 0 is reserved for `__DYNAMIC'.
         */
        current_jmpslot_offset = sizeof(jmpslot_t);
        current_got_offset = 0;
        max_got_offset = MAX_GOTOFF(pic_type);
        min_got_offset = MIN_GOTOFF(pic_type);
        gotsize = number_of_gotslots * sizeof(got_t);

        if (gotsize + min_got_offset - (int)sizeof(got_t) > max_got_offset)
                warnx("Global Offset Table overflow (use `-fPIC')");

        if (gotsize > max_got_offset)
                /* Position at "two-complements" origin */
                current_got_offset += min_got_offset;

        got_origin = -current_got_offset;

        if (rrs_section_type == RRS_NONE)
                return;

        if (rrs_section_type == RRS_PARTIAL) {
                rrs_sdt.sdt_got = rrs_data_start;
                got_symbol->value = rrs_sdt.sdt_got + got_origin;
                rrs_sdt.sdt_plt = rrs_sdt.sdt_got +
                                  number_of_gotslots * sizeof(got_t);
                return;
        }

        /*
         * RRS data relocations.
         */
        rrs_dyn.d_version = soversion;
        rrs_dyn.d_debug = (struct so_debug *)
                          (rrs_data_start + sizeof(struct _dynamic));
        rrs_dyn.d_un.d_sdt = (struct section_dispatch_table *)
                             ((long)rrs_dyn.d_debug + sizeof(struct so_debug));

        rrs_sdt.sdt_got = (long)rrs_dyn.d_un.d_sdt +
                          sizeof(struct section_dispatch_table);
        rrs_sdt.sdt_plt = rrs_sdt.sdt_got + number_of_gotslots*sizeof(got_t);

        /*
         * RRS text relocations.
         */
        rrs_sdt.sdt_rel = rrs_text_start;
        /*
         * Sun BUG compatibility alert.
         * Main program's RRS text values are relative to TXTADDR? WHY??
         */
#ifdef SUN_COMPAT
        if (soversion == LD_VERSION_SUN && !(link_mode & SHAREABLE))
                rrs_sdt.sdt_rel -= N_TXTADDR(outheader);
#endif

        rrs_sdt.sdt_hash = rrs_sdt.sdt_rel +
                        reserved_rrs_relocs * sizeof(struct relocation_info);
        rrs_sdt.sdt_nzlist = rrs_sdt.sdt_hash +
                        number_of_rrs_hash_entries * sizeof(struct rrs_hash);
        rrs_sdt.sdt_strings = rrs_sdt.sdt_nzlist +
                        number_of_rrs_symbols * rrs_symbol_size;
        rrs_sdt.sdt_paths = rrs_search_paths
                                ? rrs_sdt.sdt_strings + rrs_strtab_size
                                : 0;
        rrs_sdt.sdt_sods = rrs_shobjs
                                ? rrs_sdt.sdt_strings + rrs_strtab_size +
                                  rrs_search_paths_size
                                : 0;
        rrs_sdt.sdt_filler2 = 0;
        rrs_sdt.sdt_str_sz = rrs_strtab_size;
        rrs_sdt.sdt_text_sz = text_size;
        rrs_sdt.sdt_plt_sz = number_of_jmpslots * sizeof(jmpslot_t);

        /*
         * Assign addresses to _GLOBAL_OFFSET_TABLE_ and __DYNAMIC.
         * The value `&__DYNAMIC' is in the GOT table at offset 0.
         */
        got_symbol->value = rrs_sdt.sdt_got + got_origin;
        *GOTP(0) = dynamic_symbol->value = rrs_data_start;

}

void
write_rrs_data()
{
        long    pos;

        if (rrs_section_type == RRS_NONE)
                return;

        pos = rrs_data_start + N_TXTOFF(outheader) - text_start;
        if (fseek(outstream, pos, SEEK_SET) != 0)
                err(1, "write_rrs_data: fseek");

        if (rrs_section_type == RRS_PARTIAL) {
                /*
                 * Only a GOT and PLT are needed.
                 */
                md_swapout_got(rrs_got, number_of_gotslots);
                mywrite(rrs_got, number_of_gotslots, sizeof(got_t), outstream);

                md_swapout_jmpslot(rrs_plt, number_of_jmpslots);
                mywrite(rrs_plt, number_of_jmpslots,
                        sizeof(jmpslot_t), outstream);

                return;
        }

        md_swapout__dynamic(&rrs_dyn);
        mywrite(&rrs_dyn, 1, sizeof(struct _dynamic), outstream);

        md_swapout_so_debug(&rrs_so_debug);
        mywrite(&rrs_so_debug, 1, sizeof(struct so_debug), outstream);

        md_swapout_section_dispatch_table(&rrs_sdt);
        mywrite(&rrs_sdt, 1, sizeof(struct section_dispatch_table), outstream);

        md_swapout_got(rrs_got, number_of_gotslots);
        mywrite(rrs_got, number_of_gotslots, sizeof(got_t), outstream);

        md_swapout_jmpslot(rrs_plt, number_of_jmpslots);
        mywrite(rrs_plt, number_of_jmpslots, sizeof(jmpslot_t), outstream);
}

void
write_rrs_text()
{
        long                    pos;
        int                     i;
        int                     symsize;
        struct nzlist           *nlp;
        int                     offset = 0;
        int                     aligned_offset;
        struct shobj            *shp;
        struct sod              *sodp;
        int                     bind;

        if (rrs_section_type == RRS_PARTIAL)
                return;

        pos = rrs_text_start + N_TXTOFF(outheader) - text_start;
        if (fseek(outstream, pos, SEEK_SET) != 0)
                err(1, "write_rrs_text: fseek");

        /* Write relocation records */
        md_swapout_reloc(rrs_reloc, reserved_rrs_relocs);
        mywrite(rrs_reloc, reserved_rrs_relocs,
                sizeof(struct relocation_info), outstream);

        /* Write the RRS symbol hash tables */
        md_swapout_rrs_hash(rrs_hashtab, number_of_rrs_hash_entries);
        mywrite(rrs_hashtab, number_of_rrs_hash_entries,
                sizeof(struct rrs_hash), outstream);

        /*
         * Determine size of an RRS symbol entry, allocate space
         * to collect them in.
         */
        symsize = number_of_rrs_symbols * rrs_symbol_size;
        nlp = rrs_symbols = (struct nzlist *)alloca(symsize);
        rrs_strtab = (char *)alloca(rrs_strtab_size);

#define INCR_NLP(p)     ((p) = (struct nzlist *)((long)(p) + rrs_symbol_size))

        /* __DYNAMIC symbol *must* be first for Sun compatibility */
        nlp->nz_desc = nlp->nz_other = 0;
        if (LD_VERSION_NZLIST_P(soversion))
                nlp->nz_size = 0;
        nlp->nz_type = dynamic_symbol->defined;
        nlp->nz_value = dynamic_symbol->value;
        nlp->nz_value = dynamic_symbol->value;
        nlp->nz_strx = offset;
        strcpy(rrs_strtab + offset, dynamic_symbol->name);
        offset += 1 + strlen(dynamic_symbol->name);
        INCR_NLP(nlp);

        /*
         * Now, for each global symbol, construct a nzlist element
         * for inclusion in the RRS symbol table.
         */
        FOR_EACH_SYMBOL(i, sp) {

                if (sp == dynamic_symbol)
                        continue;

                if ((link_mode & SHAREABLE) && sp->warning) {
                        /*
                         * Write a N_WARNING duo.
                         */
                        nlp->nz_type = N_WARNING;
                        nlp->nz_un.n_strx = offset;
                        nlp->nz_value = 0;
                        nlp->nz_other = 0;
                        nlp->nz_desc = 0;
                        nlp->nz_size = 0;
                        strcpy(rrs_strtab + offset, sp->warning);
                        offset += 1 + strlen(sp->warning);
                        INCR_NLP(nlp);

                        nlp->nz_type = N_UNDF + N_EXT;
                        nlp->nz_un.n_strx = offset;
                        nlp->nz_value = 0;
                        nlp->nz_other = 0;
                        nlp->nz_desc = 0;
                        nlp->nz_size = 0;
                        strcpy(rrs_strtab + offset, sp->name);
                        offset += 1 + strlen(sp->name);
                        INCR_NLP(nlp);
                }

                if (!(sp->flags & GS_REFERENCED))
                        continue;

                if ((long)nlp - (long)rrs_symbols >=
                    number_of_rrs_symbols * rrs_symbol_size)
                        errx(1, "internal error: "
                                "rrs symbols exceed allocation %d",
                                number_of_rrs_symbols);

                nlp->nz_desc = 0;
                nlp->nz_other = 0;
                if (LD_VERSION_NZLIST_P(soversion))
                        nlp->nz_size = 0;

                bind = (sp->flags & GS_WEAK) ? BIND_WEAK : 0;

                if (sp->defined > 1) {
                        /* defined with known type */
                        if (!(link_mode & SHAREABLE) &&
                            sp->alias && sp->alias->defined > 1) {
                                /*
                                 * If the target of an indirect symbol has
                                 * been defined and we are outputting an
                                 * executable, resolve the indirection; it's
                                 * no longer needed.
                                 */
                                nlp->nz_type = sp->alias->defined;
                                nlp->nz_value = sp->alias->value;
                                nlp->nz_other = N_OTHER(bind, sp->alias->aux);
                        } else if (sp->defined == N_SIZE) {
                                /*
                                 * Make sure this symbol isn't going
                                 * to define anything.
                                 */
                                nlp->nz_type = N_UNDF;
                                nlp->nz_value = 0;
                        } else {
                                nlp->nz_type = sp->defined;
                                nlp->nz_value = sp->value;
                                nlp->nz_other = N_OTHER(bind, sp->aux);
                        }
                        if (LD_VERSION_NZLIST_P(soversion))
                                nlp->nz_size = sp->size;
                } else if (sp->common_size) {
                        /*
                         * A common definition.
                         */
                        nlp->nz_type = N_UNDF | N_EXT;
                        nlp->nz_value = sp->common_size;
                        nlp->nz_other = N_OTHER(bind, 0);
                } else if (!sp->defined) {
                        /* undefined */
                        nlp->nz_type = N_UNDF | N_EXT;
                        nlp->nz_value = 0;
                        if (sp->so_defined && sp->jmpslot_offset != -1) {
                                /*
                                 * A PLT entry. The auxiliary type -- which
                                 * must be AUX_FUNC -- is used by the run-time
                                 * linker to unambiguously resolve function
                                 * address references.
                                 */
                                if (sp->aux != AUX_FUNC)
                                        errx(1, "%s: non-function jmpslot",
                                                demangle(sp->name));
                                nlp->nz_other = N_OTHER(bind, sp->aux);
                                nlp->nz_value =
                                        rrs_sdt.sdt_plt + sp->jmpslot_offset;
                        }
                } else
                        errx(1, "internal error: %s defined in mysterious way",
                             demangle(sp->name));

                /* Set symbol's name */
                nlp->nz_strx = offset;
                strcpy(rrs_strtab + offset, sp->name);
                offset += 1 + strlen(sp->name);

                if (sp->alias) {
                        /*
                         * Write an extra symbol for indirections (possibly
                         * just a dummy).
                         */
                        int t = (nlp->nz_type == N_INDR + N_EXT);

                        INCR_NLP(nlp);
                        nlp->nz_type = N_UNDF + (t ? N_EXT : 0);
                        nlp->nz_un.n_strx = offset;
                        nlp->nz_value = 0;
                        nlp->nz_other = 0;
                        nlp->nz_desc = 0;
                        nlp->nz_size = 0;
                        strcpy(rrs_strtab + offset, sp->alias->name);
                        offset += 1 + strlen(sp->alias->name);
                }

                INCR_NLP(nlp);

        } END_EACH_SYMBOL;

        aligned_offset = MALIGN(offset);
        while (offset < aligned_offset)         /* Pad deterministically */
                rrs_strtab[offset++] = '\0';
        if (offset != rrs_strtab_size)
                errx(1, "internal error: "
                        "inconsistent RRS string table length: %d, expected %d",
                        offset, rrs_strtab_size);

        /* Write the symbol table */
        if (rrs_symbol_size == sizeof(struct nlist))
                md_swapout_symbols(rrs_symbols, number_of_rrs_symbols);
        else
                md_swapout_zsymbols(rrs_symbols, number_of_rrs_symbols);
        mywrite(rrs_symbols, symsize, 1, outstream);

        /* Write the strings */
        mywrite(rrs_strtab, rrs_strtab_size, 1, outstream);

        /* Write RT search path */
        mywrite(rrs_search_paths, rrs_search_paths_size, 1, outstream);

        /*
         * Write the names of the shared objects needed at run-time
         */
        pos = rrs_sdt.sdt_sods + number_of_shobjs * sizeof(struct sod);
        sodp = (struct sod *)alloca( number_of_shobjs * sizeof(struct sod));

        for (i = 0, shp = rrs_shobjs; shp; i++, shp = shp->next) {
                char    *name = shp->entry->local_sym_name;

                if (i >= number_of_shobjs)
                        errx(1, "internal error: # of link objects exceeds %d",
                                number_of_shobjs);

                sodp[i].sod_name = pos;
                sodp[i].sod_major = shp->entry->lib_major;
                sodp[i].sod_minor = shp->entry->lib_minor;

                if (*name == '-' && *(name+1) == 'l') {
                        name += 2;
                        sodp[i].sod_library = 1;
                } else
                        sodp[i].sod_library = 0;
                sodp[i].sod_reserved = 0;

                pos += 1 + strlen(name);
                sodp[i].sod_next = (i == number_of_shobjs - 1) ? 0 :
                        (rrs_sdt.sdt_sods + (i+1)*sizeof(struct sod));
        }

        if (i < number_of_shobjs)
                errx(1, "internal error: "
                        "# of link objects less then expected %d",
                        number_of_shobjs);

        md_swapout_sod(sodp, number_of_shobjs);
        mywrite(sodp, number_of_shobjs, sizeof(struct sod), outstream);

        for (i = 0, shp = rrs_shobjs; shp; i++, shp = shp->next) {
                char    *name = shp->entry->local_sym_name;

                if (*name == '-' && *(name+1) == 'l') {
                        name += 2;
                }

                mywrite(name, strlen(name) + 1, 1, outstream);
        }
}

void
write_rrs()
{

        /*
         * First, do some consistency checks on the RRS segment.
         */
        if (rrs_section_type == RRS_NONE) {
                if (reserved_rrs_relocs > 1)
                        errx(1, "internal error: "
                                "RRS relocs in static program: %d",
                                reserved_rrs_relocs-1);
                return;
        }

#ifdef DEBUG
printf("rrs_relocs: reserved %d claimed %d discarded %d, gotslots %d jmpslots %d\n",
        reserved_rrs_relocs, claimed_rrs_relocs, discarded_rrs_relocs,
        number_of_gotslots-1, number_of_jmpslots-1);
#endif

        /* Final consistency check */
        if (claimed_rrs_relocs  + discarded_rrs_relocs != reserved_rrs_relocs) {
                errx(1, "internal error: "
                        "reserved relocs(%d) != claimed(%d) + discarded(%d)",
                        reserved_rrs_relocs,
                        claimed_rrs_relocs,
                        discarded_rrs_relocs);
        }

        /* Write the RRS segments. */
        write_rrs_text ();
        write_rrs_data ();
}