/*-
 * Copyright (c) 2010 Kai Wang
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
 */

#include "_libdwarf.h"

ELFTC_VCSID("$Id: dwarf_pro_reloc.c 2074 2011-10-27 03:34:33Z jkoshy $");

int
dwarf_get_relocation_info_count(Dwarf_P_Debug dbg, Dwarf_Unsigned *reloc_cnt,
    int *drd_buffer_version, Dwarf_Error *error)
{

	if (dbg == NULL || reloc_cnt == NULL || drd_buffer_version == NULL) {
		DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
		return (DW_DLV_ERROR);
	}

	if ((dbg->dbgp_flags & DW_DLC_SYMBOLIC_RELOCATIONS) == 0) {
		DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
		return (DW_DLV_NO_ENTRY);
	}

	*reloc_cnt = dbg->dbgp_drscnt;
	*drd_buffer_version = DWARF_DRD_BUFFER_VERSION;

	return (DW_DLV_OK);
}

int
dwarf_get_relocation_info(Dwarf_P_Debug dbg, Dwarf_Signed *elf_section_index,
    Dwarf_Signed *elf_section_link, Dwarf_Unsigned *reloc_entry_count,
    Dwarf_Relocation_Data *reloc_buffer, Dwarf_Error *error)
{
	Dwarf_Rel_Section drs;
	Dwarf_Rel_Entry dre;
	int i;

	if (dbg == NULL || elf_section_index == NULL ||
	    elf_section_link == NULL || reloc_entry_count == NULL ||
	    reloc_buffer == NULL) {
		DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
		return (DW_DLV_ERROR);
	}

	if ((dbg->dbgp_flags & DW_DLC_SYMBOLIC_RELOCATIONS) == 0) {
		DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
		return (DW_DLV_NO_ENTRY);
	}

	if (dbg->dbgp_drscnt == 0) {
		DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
		return (DW_DLV_NO_ENTRY);
	}

	if (dbg->dbgp_drspos == NULL) {
		DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
		return (DW_DLV_NO_ENTRY);
	}

	drs = dbg->dbgp_drspos;
	assert(drs->drs_ds != NULL && drs->drs_ref != NULL);
	assert(drs->drs_drecnt > 0);

	*elf_section_index = drs->drs_ds->ds_ndx;
	*elf_section_link = drs->drs_ref->ds_ndx;
	*reloc_entry_count = drs->drs_drecnt;

	if (drs->drs_drd == NULL) {
		drs->drs_drd = calloc(*reloc_entry_count,
		    sizeof(struct Dwarf_Relocation_Data_s));
		if (drs->drs_drd == NULL) {
			DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
			return (DW_DLV_ERROR);
		}
		for (i = 0, dre = STAILQ_FIRST(&drs->drs_dre);
		    (Dwarf_Unsigned) i < *reloc_entry_count && dre != NULL;
		    i++, dre = STAILQ_NEXT(dre, dre_next)) {
			drs->drs_drd[i].drd_type = dre->dre_type;
			drs->drs_drd[i].drd_length = dre->dre_length;
			drs->drs_drd[i].drd_offset = dre->dre_offset;
			drs->drs_drd[i].drd_symbol_index = dre->dre_symndx;
		}
		assert((Dwarf_Unsigned) i == *reloc_entry_count && dre == NULL);
	}

	*reloc_buffer = drs->drs_drd;

	dbg->dbgp_drspos = STAILQ_NEXT(dbg->dbgp_drspos, drs_next);

	return (DW_DLV_OK);
}