/*      $NetBSD: libdwarf_init.c,v 1.5 2024/03/03 17:37:32 christos Exp $       */

/*-
* Copyright (c) 2009,2011 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"

__RCSID("$NetBSD: libdwarf_init.c,v 1.5 2024/03/03 17:37:32 christos Exp $");
ELFTC_VCSID("Id: libdwarf_init.c 3136 2014-12-24 16:04:38Z kaiwang27");

static int
_dwarf_consumer_init(Dwarf_Debug dbg, Dwarf_Error *error)
{
       const Dwarf_Obj_Access_Methods *m;
       Dwarf_Obj_Access_Section sec;
       void *obj;
       Dwarf_Unsigned cnt;
       Dwarf_Half i;
       int ret;

       assert(dbg != NULL);
       assert(dbg->dbg_iface != NULL);

       m = dbg->dbg_iface->methods;
       obj = dbg->dbg_iface->object;

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

       if (m->get_byte_order(obj) == DW_OBJECT_MSB) {
               dbg->read = _dwarf_read_msb;
               dbg->write = _dwarf_write_msb;
               dbg->decode = _dwarf_decode_msb;
       } else {
               dbg->read = _dwarf_read_lsb;
               dbg->write = _dwarf_write_lsb;
               dbg->decode = _dwarf_decode_lsb;
       }

       dbg->dbg_pointer_size = m->get_pointer_size(obj);
       dbg->dbg_offset_size = m->get_length_size(obj);

       cnt = m->get_section_count(obj);

       if (cnt == 0) {
               DWARF_SET_ERROR(dbg, error, DW_DLE_DEBUG_INFO_NULL);
               return (DW_DLE_DEBUG_INFO_NULL);
       }

       dbg->dbg_seccnt = cnt;

       if ((dbg->dbg_section = calloc(cnt + 1, sizeof(Dwarf_Section))) ==
           NULL) {
               DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
               return (DW_DLE_MEMORY);
       }

       for (i = 0; i < cnt; i++) {
               if (m->get_section_info(obj, i, &sec, &ret) != DW_DLV_OK) {
                       DWARF_SET_ERROR(dbg, error, ret);
                       return (ret);
               }

               dbg->dbg_section[i].ds_addr = sec.addr;
               dbg->dbg_section[i].ds_size = sec.size;
               dbg->dbg_section[i].ds_name = sec.name;

               if (m->load_section(obj, i, &dbg->dbg_section[i].ds_data, &ret)
                   != DW_DLV_OK) {
                       DWARF_SET_ERROR(dbg, error, ret);
                       return (ret);
               }
       }
       dbg->dbg_section[cnt].ds_name = NULL;

       dbg->dbg_info_sec = _dwarf_find_section(dbg, ".debug_info");

       /* Try to find the optional DWARF4 .debug_types section. */
       dbg->dbg_types_sec = _dwarf_find_next_types_section(dbg, NULL);

       /* Initialise call frame API related parameters. */
       _dwarf_frame_params_init(dbg);

       return (DW_DLV_OK);
}

static int
_dwarf_producer_init(Dwarf_Debug dbg, Dwarf_Unsigned pf, Dwarf_Error *error)
{

       /* Producer only support DWARF2 which has fixed 32bit offset. */
       dbg->dbg_offset_size = 4;

       if (pf & DW_DLC_SIZE_32 && pf & DW_DLC_SIZE_64) {
               DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
               return (DW_DLE_ARGUMENT);
       }

       if ((pf & DW_DLC_SIZE_32) == 0 && (pf & DW_DLC_SIZE_64) == 0)
               pf |= DW_DLC_SIZE_32;

       if (pf & DW_DLC_SIZE_64)
               dbg->dbg_pointer_size = 8;
       else
               dbg->dbg_pointer_size = 4;

       if (pf & DW_DLC_ISA_IA64 && pf & DW_DLC_ISA_MIPS) {
               DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
               return (DW_DLE_ARGUMENT);
       }

       if (pf & DW_DLC_ISA_IA64)
               dbg->dbgp_isa = DW_ISA_IA64;
       else
               dbg->dbgp_isa = DW_ISA_MIPS;

       if (pf & DW_DLC_TARGET_BIGENDIAN && pf & DW_DLC_TARGET_LITTLEENDIAN) {
               DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
               return (DW_DLE_ARGUMENT);
       }

       if ((pf & DW_DLC_TARGET_BIGENDIAN) == 0 &&
           (pf & DW_DLC_TARGET_LITTLEENDIAN) == 0) {
#if ELFTC_BYTE_ORDER == ELFTC_BYTE_ORDER_BIG_ENDIAN
               pf |= DW_DLC_TARGET_BIGENDIAN;
#else
               pf |= DW_DLC_TARGET_LITTLEENDIAN;
#endif
       }

       if (pf & DW_DLC_TARGET_BIGENDIAN) {
               dbg->write = _dwarf_write_msb;
               dbg->write_alloc = _dwarf_write_msb_alloc;
       } else if (pf & DW_DLC_TARGET_LITTLEENDIAN) {
               dbg->write = _dwarf_write_lsb;
               dbg->write_alloc = _dwarf_write_lsb_alloc;
       } else
               assert(0);

       if (pf & DW_DLC_STREAM_RELOCATIONS &&
           pf & DW_DLC_SYMBOLIC_RELOCATIONS) {
               DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
               return (DW_DLE_ARGUMENT);
       }

       if ((pf & DW_DLC_STREAM_RELOCATIONS) == 0 &&
           (pf & DW_DLC_SYMBOLIC_RELOCATIONS) == 0)
               pf |= DW_DLC_STREAM_RELOCATIONS;

       dbg->dbgp_flags = pf;

       STAILQ_INIT(&dbg->dbgp_dielist);
       STAILQ_INIT(&dbg->dbgp_pelist);
       STAILQ_INIT(&dbg->dbgp_seclist);
       STAILQ_INIT(&dbg->dbgp_drslist);
       STAILQ_INIT(&dbg->dbgp_cielist);
       STAILQ_INIT(&dbg->dbgp_fdelist);

       if ((dbg->dbgp_lineinfo = calloc(1, sizeof(struct _Dwarf_LineInfo))) ==
           NULL) {
               DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
               return (DW_DLE_MEMORY);
       }
       STAILQ_INIT(&dbg->dbgp_lineinfo->li_lflist);
       STAILQ_INIT(&dbg->dbgp_lineinfo->li_lnlist);

       if ((dbg->dbgp_as = calloc(1, sizeof(struct _Dwarf_ArangeSet))) ==
           NULL) {
               DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
               return (DW_DLE_MEMORY);
       }
       STAILQ_INIT(&dbg->dbgp_as->as_arlist);

       return (DW_DLE_NONE);
}

int
_dwarf_init(Dwarf_Debug dbg, Dwarf_Unsigned pro_flags, Dwarf_Handler errhand,
   Dwarf_Ptr errarg, Dwarf_Error *error)
{
       int ret;

       ret = DW_DLE_NONE;

       /*
        * Set the error handler fields early, so that the application
        * is notified of initialization errors.
        */
       dbg->dbg_errhand = errhand;
       dbg->dbg_errarg = errarg;

       STAILQ_INIT(&dbg->dbg_cu);
       STAILQ_INIT(&dbg->dbg_tu);
       STAILQ_INIT(&dbg->dbg_rllist);
       STAILQ_INIT(&dbg->dbg_aslist);
       STAILQ_INIT(&dbg->dbg_mslist);

       if (dbg->dbg_mode == DW_DLC_READ || dbg->dbg_mode == DW_DLC_RDWR) {
               ret = _dwarf_consumer_init(dbg, error);
               if (ret != DW_DLE_NONE) {
                       _dwarf_deinit(dbg);
                       return (ret);
               }
       }

       if (dbg->dbg_mode == DW_DLC_WRITE) {
               ret = _dwarf_producer_init(dbg, pro_flags, error);
               if (ret != DW_DLE_NONE) {
                       _dwarf_deinit(dbg);
                       return (ret);
               }
       }

       /*
        * Initialise internal string table.
        */
       if ((ret = _dwarf_strtab_init(dbg, error)) != DW_DLE_NONE)
               return (ret);

       return (DW_DLE_NONE);
}

static void
_dwarf_producer_deinit(Dwarf_P_Debug dbg)
{

       assert(dbg != NULL && dbg->dbg_mode == DW_DLC_WRITE);

       _dwarf_info_pro_cleanup(dbg);
       _dwarf_die_pro_cleanup(dbg);
       _dwarf_expr_cleanup(dbg);
       _dwarf_lineno_pro_cleanup(dbg);
       _dwarf_frame_pro_cleanup(dbg);
       _dwarf_arange_pro_cleanup(dbg);
       _dwarf_macinfo_pro_cleanup(dbg);
       _dwarf_strtab_cleanup(dbg);
       _dwarf_nametbl_pro_cleanup(&dbg->dbgp_pubs);
       _dwarf_nametbl_pro_cleanup(&dbg->dbgp_weaks);
       _dwarf_nametbl_pro_cleanup(&dbg->dbgp_funcs);
       _dwarf_nametbl_pro_cleanup(&dbg->dbgp_types);
       _dwarf_nametbl_pro_cleanup(&dbg->dbgp_vars);
       _dwarf_section_cleanup(dbg);
       _dwarf_reloc_cleanup(dbg);
}

static void
_dwarf_consumer_deinit(Dwarf_Debug dbg)
{

       assert(dbg != NULL && dbg->dbg_mode == DW_DLC_READ);

       _dwarf_info_cleanup(dbg);
       _dwarf_ranges_cleanup(dbg);
       _dwarf_frame_cleanup(dbg);
       _dwarf_arange_cleanup(dbg);
       _dwarf_macinfo_cleanup(dbg);
       _dwarf_strtab_cleanup(dbg);
       _dwarf_nametbl_cleanup(&dbg->dbg_globals);
       _dwarf_nametbl_cleanup(&dbg->dbg_pubtypes);
       _dwarf_nametbl_cleanup(&dbg->dbg_weaks);
       _dwarf_nametbl_cleanup(&dbg->dbg_funcs);
       _dwarf_nametbl_cleanup(&dbg->dbg_vars);
       _dwarf_nametbl_cleanup(&dbg->dbg_types);

       free(dbg->dbg_section);
}

void
_dwarf_deinit(Dwarf_Debug dbg)
{

       assert(dbg != NULL);

       if (dbg->dbg_mode == DW_DLC_READ)
               _dwarf_consumer_deinit(dbg);
       else if (dbg->dbg_mode == DW_DLC_WRITE)
               _dwarf_producer_deinit(dbg);
}

int
_dwarf_alloc(Dwarf_Debug *ret_dbg, int mode, Dwarf_Error *error)
{
       Dwarf_Debug dbg;

       if ((dbg = calloc(sizeof(struct _Dwarf_Debug), 1)) == NULL) {
               DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
               return (DW_DLE_MEMORY);
       }

       dbg->dbg_mode = mode;

       *ret_dbg = dbg;

       return (DW_DLE_NONE);
}

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