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

/*-
* 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"

__RCSID("$NetBSD: libdwarf_sections.c,v 1.5 2024/03/03 17:37:32 christos Exp $");
ELFTC_VCSID("Id: libdwarf_sections.c 3041 2014-05-18 15:11:03Z kaiwang27");

#define _SECTION_INIT_SIZE      128

int
_dwarf_section_init(Dwarf_P_Debug dbg, Dwarf_P_Section *dsp, const char *name,
   int pseudo, Dwarf_Error *error)
{
       Dwarf_P_Section ds;

       assert(dbg != NULL && dsp != NULL && name != NULL);

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

       if ((ds->ds_name = strdup(name)) == NULL) {
               free(ds);
               DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
               return (DW_DLE_MEMORY);
       }

       if (!pseudo) {
               ds->ds_cap = _SECTION_INIT_SIZE;
               if ((ds->ds_data = malloc((size_t) ds->ds_cap)) == NULL) {
                       free(ds->ds_name);
                       free(ds);
                       DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
                       return (DW_DLE_MEMORY);
               }
               STAILQ_INSERT_TAIL(&dbg->dbgp_seclist, ds, ds_next);
               dbg->dbgp_seccnt++;
       }

       *dsp = ds;

       return (DW_DLE_NONE);
}

void
_dwarf_section_free(Dwarf_P_Debug dbg, Dwarf_P_Section *dsp)
{
       Dwarf_P_Section ds, tds;

       assert(dbg != NULL && dsp != NULL);

       if (*dsp == NULL)
               return;

       STAILQ_FOREACH_SAFE(ds, &dbg->dbgp_seclist, ds_next, tds) {
               if (ds == *dsp) {
                       STAILQ_REMOVE(&dbg->dbgp_seclist, ds, _Dwarf_P_Section,
                           ds_next);
                       dbg->dbgp_seccnt--;
                       break;
               }
       }
       ds = *dsp;
       if (ds->ds_name)
               free(ds->ds_name);
       if (ds->ds_data)
               free(ds->ds_data);
       free(ds);
       *dsp = NULL;
}

int
_dwarf_pro_callback(Dwarf_P_Debug dbg, char *name, int size,
   Dwarf_Unsigned type, Dwarf_Unsigned flags, Dwarf_Unsigned link,
   Dwarf_Unsigned info, Dwarf_Unsigned *symndx, int *error)
{
       int e, ret, isymndx;

       assert(dbg != NULL && name != NULL && symndx != NULL);

       if (dbg->dbgp_func_b)
               ret = dbg->dbgp_func_b(name, size, type, flags, link, info,
                   symndx, &e);
       else {
               ret = dbg->dbgp_func(name, size, type, flags, link, info,
                   &isymndx, &e);
               *symndx = isymndx;
       }
       if (ret < 0) {
               if (error)
                       *error = e;
       }

       return (ret);
}

int
_dwarf_section_callback(Dwarf_P_Debug dbg, Dwarf_P_Section ds,
   Dwarf_Unsigned type, Dwarf_Unsigned flags, Dwarf_Unsigned link,
   Dwarf_Unsigned info, Dwarf_Error *error)
{
       int ret, ndx;

       ndx = _dwarf_pro_callback(dbg, ds->ds_name, (int) ds->ds_size,
           type, flags, link, info, &ds->ds_symndx, NULL);
       if (ndx < 0) {
               ret = DW_DLE_ELF_SECT_ERR;
               DWARF_SET_ERROR(dbg, error, ret);
               return (ret);
       }
       ds->ds_ndx = ndx;

       return (DW_DLE_NONE);
}

int
_dwarf_generate_sections(Dwarf_P_Debug dbg, Dwarf_Error *error)
{
       int ret;

       /* Produce .debug_info section. */
       if ((ret = _dwarf_info_gen(dbg, error)) != DW_DLE_NONE)
               return (ret);

       /* Produce .debug_abbrev section. */
       if ((ret = _dwarf_abbrev_gen(dbg, error)) != DW_DLE_NONE)
               return (ret);

       /* Produce .debug_line section. */
       if ((ret = _dwarf_lineno_gen(dbg, error)) != DW_DLE_NONE)
               return (ret);

       /* Produce .debug_frame section. */
       if ((ret = _dwarf_frame_gen(dbg, error)) != DW_DLE_NONE)
               return (ret);

       /* Produce .debug_aranges section. */
       if ((ret = _dwarf_arange_gen(dbg, error)) != DW_DLE_NONE)
               return (ret);

       /* Produce .debug_macinfo section. */
       if ((ret = _dwarf_macinfo_gen(dbg, error)) != DW_DLE_NONE)
               return (ret);

       /* Produce .debug_pubnames section. */
       if ((ret = _dwarf_nametbl_gen(dbg, ".debug_pubnames", dbg->dbgp_pubs,
           error)) != DW_DLE_NONE)
               return (ret);

       /* Produce .debug_weaknames section. */
       if ((ret = _dwarf_nametbl_gen(dbg, ".debug_weaknames", dbg->dbgp_weaks,
           error)) != DW_DLE_NONE)
               return (ret);

       /* Produce .debug_funcnames section. */
       if ((ret = _dwarf_nametbl_gen(dbg, ".debug_funcnames", dbg->dbgp_funcs,
           error)) != DW_DLE_NONE)
               return (ret);

       /* Produce .debug_typenames section. */
       if ((ret = _dwarf_nametbl_gen(dbg, ".debug_typenames", dbg->dbgp_types,
           error)) != DW_DLE_NONE)
               return (ret);

       /* Produce .debug_varnames section. */
       if ((ret = _dwarf_nametbl_gen(dbg, ".debug_varnames", dbg->dbgp_vars,
           error)) != DW_DLE_NONE)
               return (ret);

       /* Produce .debug_str section. */
       if ((ret = _dwarf_strtab_gen(dbg, error)) != DW_DLE_NONE)
               return (ret);

       /* Finally, update and generate all relocation sections. */
       if ((ret = _dwarf_reloc_gen(dbg, error)) != DW_DLE_NONE)
               return (ret);

       /* Set section/relocation iterator to the first element. */
       dbg->dbgp_secpos = STAILQ_FIRST(&dbg->dbgp_seclist);
       dbg->dbgp_drspos = STAILQ_FIRST(&dbg->dbgp_drslist);

       return (DW_DLE_NONE);
}

Dwarf_Section *
_dwarf_find_section(Dwarf_Debug dbg, const char *name)
{
       Dwarf_Section *ds;
       Dwarf_Half i;

       assert(dbg != NULL && name != NULL);

       for (i = 0; i < dbg->dbg_seccnt; i++) {
               ds = &dbg->dbg_section[i];
               if (ds->ds_name != NULL && !strcmp(ds->ds_name, name))
                       return (ds);
       }

       return (NULL);
}

Dwarf_Section *
_dwarf_find_next_types_section(Dwarf_Debug dbg, Dwarf_Section *ds)
{

       assert(dbg != NULL);

       if (ds == NULL)
               return (_dwarf_find_section(dbg, ".debug_types"));

       assert(ds->ds_name != NULL);

       do {
               ds++;
               if (ds->ds_name != NULL &&
                   !strcmp(ds->ds_name, ".debug_types"))
                       return (ds);
       } while (ds->ds_name != NULL);

       return (NULL);
}

Dwarf_P_Section
_dwarf_pro_find_section(Dwarf_P_Debug dbg, const char *name)
{
       Dwarf_P_Section ds;

       assert(dbg != NULL && name != NULL);

       STAILQ_FOREACH(ds, &dbg->dbgp_seclist, ds_next) {
               if (ds->ds_name != NULL && !strcmp(ds->ds_name ,name))
                       return (ds);
       }

       return (NULL);
}

void
_dwarf_section_cleanup(Dwarf_P_Debug dbg)
{
       Dwarf_P_Section ds, tds;

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

       STAILQ_FOREACH_SAFE(ds, &dbg->dbgp_seclist, ds_next, tds) {
               STAILQ_REMOVE(&dbg->dbgp_seclist, ds, _Dwarf_P_Section,
                   ds_next);
               if (ds->ds_name)
                       free(ds->ds_name);
               if (ds->ds_data)
                       free(ds->ds_data);
               free(ds);
       }
       dbg->dbgp_seccnt = 0;
       dbg->dbgp_secpos = 0;
}

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