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      1 /*	$NetBSD: dwarf_pro_reloc.c,v 1.5 2024/03/03 17:37:32 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2010 Kai Wang
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #include "_libdwarf.h"
     30 
     31 __RCSID("$NetBSD: dwarf_pro_reloc.c,v 1.5 2024/03/03 17:37:32 christos Exp $");
     32 ELFTC_VCSID("Id: dwarf_pro_reloc.c 2074 2011-10-27 03:34:33Z jkoshy");
     33 
     34 int
     35 dwarf_get_relocation_info_count(Dwarf_P_Debug dbg, Dwarf_Unsigned *reloc_cnt,
     36     int *drd_buffer_version, Dwarf_Error *error)
     37 {
     38 
     39 	if (dbg == NULL || reloc_cnt == NULL || drd_buffer_version == NULL) {
     40 		DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
     41 		return (DW_DLV_ERROR);
     42 	}
     43 
     44 	if ((dbg->dbgp_flags & DW_DLC_SYMBOLIC_RELOCATIONS) == 0) {
     45 		DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
     46 		return (DW_DLV_NO_ENTRY);
     47 	}
     48 
     49 	*reloc_cnt = dbg->dbgp_drscnt;
     50 	*drd_buffer_version = DWARF_DRD_BUFFER_VERSION;
     51 
     52 	return (DW_DLV_OK);
     53 }
     54 
     55 int
     56 dwarf_get_relocation_info(Dwarf_P_Debug dbg, Dwarf_Signed *elf_section_index,
     57     Dwarf_Signed *elf_section_link, Dwarf_Unsigned *reloc_entry_count,
     58     Dwarf_Relocation_Data *reloc_buffer, Dwarf_Error *error)
     59 {
     60 	Dwarf_Rel_Section drs;
     61 	Dwarf_Rel_Entry dre;
     62 	int i;
     63 
     64 	if (dbg == NULL || elf_section_index == NULL ||
     65 	    elf_section_link == NULL || reloc_entry_count == NULL ||
     66 	    reloc_buffer == NULL) {
     67 		DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
     68 		return (DW_DLV_ERROR);
     69 	}
     70 
     71 	if ((dbg->dbgp_flags & DW_DLC_SYMBOLIC_RELOCATIONS) == 0) {
     72 		DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
     73 		return (DW_DLV_NO_ENTRY);
     74 	}
     75 
     76 	if (dbg->dbgp_drscnt == 0) {
     77 		DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
     78 		return (DW_DLV_NO_ENTRY);
     79 	}
     80 
     81 	if (dbg->dbgp_drspos == NULL) {
     82 		DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
     83 		return (DW_DLV_NO_ENTRY);
     84 	}
     85 
     86 	drs = dbg->dbgp_drspos;
     87 	assert(drs->drs_ds != NULL && drs->drs_ref != NULL);
     88 	assert(drs->drs_drecnt > 0);
     89 
     90 	*elf_section_index = drs->drs_ds->ds_ndx;
     91 	*elf_section_link = drs->drs_ref->ds_ndx;
     92 	*reloc_entry_count = drs->drs_drecnt;
     93 
     94 	if (drs->drs_drd == NULL) {
     95 		drs->drs_drd = calloc(*reloc_entry_count,
     96 		    sizeof(struct Dwarf_Relocation_Data_s));
     97 		if (drs->drs_drd == NULL) {
     98 			DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
     99 			return (DW_DLV_ERROR);
    100 		}
    101 		for (i = 0, dre = STAILQ_FIRST(&drs->drs_dre);
    102 		    (Dwarf_Unsigned) i < *reloc_entry_count && dre != NULL;
    103 		    i++, dre = STAILQ_NEXT(dre, dre_next)) {
    104 			drs->drs_drd[i].drd_type = dre->dre_type;
    105 			drs->drs_drd[i].drd_length = dre->dre_length;
    106 			drs->drs_drd[i].drd_offset = dre->dre_offset;
    107 			drs->drs_drd[i].drd_symbol_index = dre->dre_symndx;
    108 		}
    109 		assert((Dwarf_Unsigned) i == *reloc_entry_count && dre == NULL);
    110 	}
    111 
    112 	*reloc_buffer = drs->drs_drd;
    113 
    114 	dbg->dbgp_drspos = STAILQ_NEXT(dbg->dbgp_drspos, drs_next);
    115 
    116 	return (DW_DLV_OK);
    117 }
    118