path: root/libdwarf/pro_reloc_symbolic.c

/*

  Copyright (C) 2000,2004 Silicon Graphics, Inc.  All Rights Reserved.
  Portions Copyright 2011 David Anderson.  All Rights Reserved.

  This program is free software; you can redistribute it and/or modify it
  under the terms of version 2.1 of the GNU Lesser General Public License 
  as published by the Free Software Foundation.

  This program is distributed in the hope that it would be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  

  Further, this software is distributed without any warranty that it is
  free of the rightful claim of any third person regarding infringement 
  or the like.  Any license provided herein, whether implied or 
  otherwise, applies only to this software file.  Patent licenses, if
  any, provided herein do not apply to combinations of this program with 
  other software, or any other product whatsoever.  

  You should have received a copy of the GNU Lesser General Public 
  License along with this program; if not, write the Free Software 
  Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston MA 02110-1301,
  USA.

  Contact information:  Silicon Graphics, Inc., 1500 Crittenden Lane,
  Mountain View, CA 94043, or:

  http://www.sgi.com

  For further information regarding this notice, see:

  http://oss.sgi.com/projects/GenInfo/NoticeExplan

*/



#include "config.h"
#include "libdwarfdefs.h"
#include <stdio.h>
#include <string.h>
/*#include <elfaccess.h> */
#include "pro_incl.h"
#include "pro_section.h"
#include "pro_reloc.h"
#include "pro_reloc_symbolic.h"

/*  Return DW_DLV_ERROR on malloc error.
    Return DW_DLV_OK otherwise */

int
_dwarf_pro_reloc_name_symbolic(Dwarf_P_Debug dbg, 
    int base_sec_index, 
    Dwarf_Unsigned offset, /* r_offset of reloc */
    Dwarf_Unsigned symidx,
    enum Dwarf_Rel_Type type,
    int reltarget_length)
{
    /* get a slot, fill in the slot entry */
    void *relrec_to_fill = 0;
    int res = 0;
    struct Dwarf_Relocation_Data_s *slotp;

    res = _dwarf_pro_reloc_get_a_slot(dbg, base_sec_index,
        &relrec_to_fill);
    if (res != DW_DLV_OK)
        return res;
    slotp = (struct Dwarf_Relocation_Data_s *) relrec_to_fill;
    slotp->drd_type = type;
    slotp->drd_length = reltarget_length;
    slotp->drd_offset = offset;
    slotp->drd_symbol_index = symidx;
    return DW_DLV_OK;
}



/*  Return DW_DLV_ERROR on malloc error.
    Return DW_DLV_OK otherwise */
int
_dwarf_pro_reloc_length_symbolic(Dwarf_P_Debug dbg, 
    int base_sec_index, 
    Dwarf_Unsigned offset,  /* r_offset of reloc */
    Dwarf_Unsigned start_symidx,
    Dwarf_Unsigned end_symidx,
    enum Dwarf_Rel_Type type,
    int reltarget_length)
{
    /* get a slot, fill in the slot entry */
    void *relrec_to_fill = 0;
    int res = 0;
    struct Dwarf_Relocation_Data_s *slotp1 = 0;
    struct Dwarf_Relocation_Data_s *slotp2 = 0;

    res = _dwarf_pro_reloc_get_a_slot(dbg, base_sec_index,
        &relrec_to_fill);
    if (res != DW_DLV_OK)
        return res;
    slotp1 = (struct Dwarf_Relocation_Data_s *) relrec_to_fill;
    res = _dwarf_pro_reloc_get_a_slot(dbg, base_sec_index,
        &relrec_to_fill);
    if (res != DW_DLV_OK)
        return res;
    slotp2 = (struct Dwarf_Relocation_Data_s *) relrec_to_fill;

    /* ASSERT: type == dwarf_drt_first_of_length_type_pair */
    slotp1->drd_type = type;
    slotp1->drd_length = reltarget_length;
    slotp1->drd_offset = offset;
    slotp1->drd_symbol_index = start_symidx;

    slotp2->drd_type = dwarf_drt_second_of_length_pair;
    slotp2->drd_length = reltarget_length;
    slotp2->drd_offset = offset;
    slotp2->drd_symbol_index = end_symidx;
    return DW_DLV_OK;
}

/*  Reset whatever fields of Dwarf_P_Per_Reloc_Sect_s
    we must to allow adding a fresh new single
    block easily (block consolidation use only).  */
static void
_dwarf_reset_reloc_sect_info(struct Dwarf_P_Per_Reloc_Sect_s *pblk,
    unsigned long ct)
{


    /* Do not zero pr_sect_num_of_reloc_sect */
    pblk->pr_reloc_total_count = 0;
    pblk->pr_first_block = 0;
    pblk->pr_last_block = 0;
    pblk->pr_block_count = 0;
    pblk->pr_slots_per_block_to_alloc = ct;
}

/*  Ensure each stream is a single buffer and
    add that single buffer to the set of stream buffers.

    By creating a new buffer and copying if necessary.
    (If > 1 block, reduce to 1 block)

    Free the input set of buffers if we consolidate.

    We pass back *new_sec_count as zero because we
    are not creating normal sections for a .o, but
    symbolic relocations, separately counted.

    Return -1 on error (malloc failure)

    Return DW_DLV_OK on success. Any other return indicates 
    malloc failed.  */
int
_dwarf_symbolic_relocs_to_disk(Dwarf_P_Debug dbg,
    Dwarf_Signed * new_sec_count)
{
    /* unsigned long total_size =0; */
    Dwarf_Small *data = 0;
    int sec_index = 0;
    int res = 0;
    unsigned long i = 0;
    Dwarf_Error error = 0;
    Dwarf_Signed sec_count = 0;
    Dwarf_P_Per_Reloc_Sect p_reloc = &dbg->de_reloc_sect[0];

    for (i = 0; i < NUM_DEBUG_SECTIONS; ++i, ++p_reloc) {
        unsigned long ct = p_reloc->pr_reloc_total_count;
        struct Dwarf_P_Relocation_Block_s *p_blk;
        struct Dwarf_P_Relocation_Block_s *p_blk_last;
        int err;
        if (ct == 0) {
            continue;
        }

        /* len = dbg->de_relocation_record_size; */
        ++sec_count;

        /* total_size = ct *len; */
        sec_index = p_reloc->pr_sect_num_of_reloc_sect;
        if (sec_index == 0) {
            /*  Call de_callback_func or de_callback_func_b, 
                getting section number of reloc section. */
            int rel_section_index = 0;
            int int_name = 0;
            Dwarf_Unsigned name_idx = 0;

            /*  This is a bit of a fake, as we do not really have true
                elf sections at all. Just the data such might contain.
                But this lets the caller eventually link things
                together: without this call we would not know what rel
                data goes with what section when we are asked for the
                real arrays. */

            if (dbg->de_callback_func_c) {
                rel_section_index =
                    dbg->de_callback_func_c(_dwarf_rel_section_names[i],
                        dbg->de_relocation_record_size,
                        /* type */ SHT_REL,
                        /* flags */ 0,
                        /* link to symtab, which we cannot
                            know */ SHN_UNDEF,
                        /* sec rels apply to */
                        dbg->de_elf_sects[i],
                        &name_idx, 
                        dbg->de_user_data,&err); 
            } else if (dbg->de_callback_func_b) {
                rel_section_index =
                    dbg->de_callback_func_b(_dwarf_rel_section_names[i],
                        dbg->de_relocation_record_size,
                        /* type */ SHT_REL,
                        /* flags */ 0,
                        /* link to symtab, which we cannot
                            know */ SHN_UNDEF,
                        /* sec rels apply to */
                        dbg->de_elf_sects[i],
                        &name_idx, &err);
            } else {
                rel_section_index =
                    dbg->de_callback_func(_dwarf_rel_section_names[i],
                        dbg->de_relocation_record_size,
                        /* type */ SHT_REL,
                        /* flags */ 0,
                        /* link to symtab, which we cannot
                            know */ SHN_UNDEF,
                        /* sec rels apply to, in elf, sh_info */
                        dbg->de_elf_sects[i], &int_name, &err);
                name_idx = int_name;
            }
            if (rel_section_index == -1) {
                {
                    _dwarf_p_error(dbg, &error, DW_DLE_ELF_SECT_ERR);
                    return (DW_DLV_ERROR);
                }
            }
            p_reloc->pr_sect_num_of_reloc_sect = rel_section_index;
            sec_index = rel_section_index;
        }

        p_blk = p_reloc->pr_first_block;

        if (p_reloc->pr_block_count > 1) {
            struct Dwarf_P_Relocation_Block_s *new_blk;

            /*  HACK , not normal interfaces, trashing p_reloc current
                contents! */
            _dwarf_reset_reloc_sect_info(p_reloc, ct);

            /* Creating new single block for all 'ct' entries */
            res = _dwarf_pro_pre_alloc_n_reloc_slots(dbg, (int) i, ct);
            if (res != DW_DLV_OK) {
                return res;
            }
            new_blk = p_reloc->pr_first_block;

            data = (Dwarf_Small *) new_blk->rb_data;

            /*  The following loop does the consolidation to a single
                block and frees the input block(s). */
            do {
                unsigned long len =
                    p_blk->rb_where_to_add_next - p_blk->rb_data;
                memcpy(data, p_blk->rb_data, len);
                data += len;
                p_blk_last = p_blk;
                p_blk = p_blk->rb_next;
                _dwarf_p_dealloc(dbg, (Dwarf_Small *) p_blk_last);
            } while (p_blk);
            /* ASSERT: sum of len copied == total_size */
            new_blk->rb_next_slot_to_use = ct;
            new_blk->rb_where_to_add_next = (char *) data;
            p_reloc->pr_reloc_total_count = ct;

            /*  Have now created a single block, but no change in slots
                used (pr_reloc_total_count) */
        }
    }
    *new_sec_count = 0;
    return DW_DLV_OK;
}