/*-
 * Copyright (c) 2009 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: libdwarf_elf_access.c 2070 2011-10-27 03:05:32Z jkoshy $");

int
_dwarf_elf_get_section_info(void *obj, Dwarf_Half ndx,
    Dwarf_Obj_Access_Section *ret_section, int *error)
{
	Dwarf_Elf_Object *e;
	GElf_Shdr *sh;

	e = obj;
	assert(e != NULL);

	if (ret_section == NULL) {
		if (error)
			*error = DW_DLE_ARGUMENT;
		return (DW_DLV_ERROR);
	}

	if (ndx >= e->eo_seccnt) {
		if (error)
			*error = DW_DLE_NO_ENTRY;
		return (DW_DLV_NO_ENTRY);
	}

	sh = &e->eo_shdr[ndx];

	ret_section->addr = sh->sh_addr;
	ret_section->size = sh->sh_size;

	ret_section->name = elf_strptr(e->eo_elf, e->eo_strndx, sh->sh_name);
	if (ret_section->name == NULL) {
		if (error)
			*error = DW_DLE_ELF;
		return (DW_DLV_ERROR);
	}

	return (DW_DLV_OK);
}

Dwarf_Endianness
_dwarf_elf_get_byte_order(void *obj)
{
	Dwarf_Elf_Object *e;

	e = obj;
	assert(e != NULL);

	switch (e->eo_ehdr.e_ident[EI_DATA]) {
	case ELFDATA2MSB:
		return (DW_OBJECT_MSB);

	case ELFDATA2LSB:
	case ELFDATANONE:
	default:
		return (DW_OBJECT_LSB);
	}
}

Dwarf_Small
_dwarf_elf_get_length_size(void *obj)
{
	Dwarf_Elf_Object *e;

	e = obj;
	assert(e != NULL);

	if (gelf_getclass(e->eo_elf) == ELFCLASS32)
		return (4);
	else if (e->eo_ehdr.e_machine == EM_MIPS)
		return (8);
	else
		return (4);
}

Dwarf_Small
_dwarf_elf_get_pointer_size(void *obj)
{
	Dwarf_Elf_Object *e;

	e = obj;
	assert(e != NULL);

	if (gelf_getclass(e->eo_elf) == ELFCLASS32)
		return (4);
	else
		return (8);
}

Dwarf_Unsigned
_dwarf_elf_get_section_count(void *obj)
{
	Dwarf_Elf_Object *e;

	e = obj;
	assert(e != NULL);

	return (e->eo_seccnt);
}

int
_dwarf_elf_load_section(void *obj, Dwarf_Half ndx, Dwarf_Small** ret_data,
    int *error)
{
	Dwarf_Elf_Object *e;
	Dwarf_Elf_Data *ed;

	e = obj;
	assert(e != NULL);

	if (ret_data == NULL) {
		if (error)
			*error = DW_DLE_ARGUMENT;
		return (DW_DLV_ERROR);
	}

	if (ndx >= e->eo_seccnt) {
		if (error)
			*error = DW_DLE_NO_ENTRY;
		return (DW_DLV_NO_ENTRY);
	}

	ed = &e->eo_data[ndx];

	if (ed->ed_alloc != NULL)
		*ret_data = ed->ed_alloc;
	else {
		if (ed->ed_data == NULL) {
			if (error)
				*error = DW_DLE_NO_ENTRY;
			return (DW_DLV_NO_ENTRY);
		}
		*ret_data = ed->ed_data->d_buf;
	}

	return (DW_DLV_OK);
}