bc5fce8d8f
attributes that have form DW_FORM_sec_offset. * If the .debug_info section conforms to DWARF4, do not allow the value of attributes with form DW_FORM_data[48] to be used as section offset.
288 lines
7.8 KiB
C
288 lines
7.8 KiB
C
/*-
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* Copyright (c) 2009 Kai Wang
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "_libdwarf.h"
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ELFTC_VCSID("$Id: dwarf_loclist.c 2074 2011-10-27 03:34:33Z jkoshy $");
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int
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dwarf_loclist_n(Dwarf_Attribute at, Dwarf_Locdesc ***llbuf,
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Dwarf_Signed *listlen, Dwarf_Error *error)
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{
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Dwarf_Loclist ll;
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Dwarf_Debug dbg;
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int ret;
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dbg = at != NULL ? at->at_die->die_dbg : NULL;
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if (at == NULL || llbuf == NULL || listlen == NULL) {
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DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
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return (DW_DLV_ERROR);
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}
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switch (at->at_attrib) {
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case DW_AT_location:
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case DW_AT_string_length:
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case DW_AT_return_addr:
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case DW_AT_data_member_location:
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case DW_AT_frame_base:
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case DW_AT_segment:
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case DW_AT_static_link:
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case DW_AT_use_location:
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case DW_AT_vtable_elem_location:
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switch (at->at_form) {
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case DW_FORM_data4:
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case DW_FORM_data8:
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/*
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* DW_FORM_data[48] can not be used as section offset
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* since DWARF4. For DWARF[23], the application needs
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* to determine if DW_FORM_data[48] is representing
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* a constant or a section offset.
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*/
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if (at->at_die->die_cu->cu_version >= 4) {
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DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
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return (DW_DLV_NO_ENTRY);
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}
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/* FALLTHROUGH */
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case DW_FORM_sec_offset:
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ret = _dwarf_loclist_find(dbg, at->at_die->die_cu,
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at->u[0].u64, &ll, error);
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if (ret == DW_DLE_NO_ENTRY) {
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DWARF_SET_ERROR(dbg, error, ret);
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return (DW_DLV_NO_ENTRY);
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}
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if (ret != DW_DLE_NONE)
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return (DW_DLV_ERROR);
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*llbuf = ll->ll_ldlist;
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*listlen = ll->ll_ldlen;
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return (DW_DLV_OK);
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case DW_FORM_block:
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case DW_FORM_block1:
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case DW_FORM_block2:
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case DW_FORM_block4:
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if (at->at_ld == NULL) {
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ret = _dwarf_loc_add(at->at_die, at, error);
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if (ret != DW_DLE_NONE)
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return (DW_DLV_ERROR);
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}
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*llbuf = &at->at_ld;
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*listlen = 1;
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return (DW_DLV_OK);
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default:
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/* Malformed Attr? */
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DWARF_SET_ERROR(dbg, error, DW_DLE_ATTR_FORM_BAD);
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return (DW_DLV_NO_ENTRY);
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}
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default:
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/* Wrong attr supplied. */
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DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
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return (DW_DLV_ERROR);
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}
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}
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int
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dwarf_loclist(Dwarf_Attribute at, Dwarf_Locdesc **llbuf,
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Dwarf_Signed *listlen, Dwarf_Error *error)
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{
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Dwarf_Loclist ll;
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Dwarf_Debug dbg;
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int ret;
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dbg = at != NULL ? at->at_die->die_dbg : NULL;
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if (at == NULL || llbuf == NULL || listlen == NULL) {
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DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
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return (DW_DLV_ERROR);
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}
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switch (at->at_attrib) {
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case DW_AT_location:
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case DW_AT_string_length:
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case DW_AT_return_addr:
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case DW_AT_data_member_location:
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case DW_AT_frame_base:
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case DW_AT_segment:
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case DW_AT_static_link:
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case DW_AT_use_location:
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case DW_AT_vtable_elem_location:
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switch (at->at_form) {
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case DW_FORM_data4:
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case DW_FORM_data8:
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/*
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* DW_FORM_data[48] can not be used as section offset
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* since DWARF4. For DWARF[23], the application needs
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* to determine if DW_FORM_data[48] is representing
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* a constant or a section offset.
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*/
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if (at->at_die->die_cu->cu_version >= 4) {
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printf("called cu_version >= 4\n");
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DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
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return (DW_DLV_NO_ENTRY);
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}
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/* FALLTHROUGH */
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case DW_FORM_sec_offset:
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ret = _dwarf_loclist_find(at->at_die->die_dbg,
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at->at_die->die_cu, at->u[0].u64, &ll, error);
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if (ret == DW_DLE_NO_ENTRY) {
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DWARF_SET_ERROR(dbg, error, DW_DLV_NO_ENTRY);
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return (DW_DLV_NO_ENTRY);
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}
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if (ret != DW_DLE_NONE)
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return (DW_DLV_ERROR);
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*llbuf = ll->ll_ldlist[0];
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*listlen = 1;
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return (DW_DLV_OK);
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case DW_FORM_block:
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case DW_FORM_block1:
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case DW_FORM_block2:
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case DW_FORM_block4:
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if (at->at_ld == NULL) {
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ret = _dwarf_loc_add(at->at_die, at, error);
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if (ret != DW_DLE_NONE)
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return (DW_DLV_ERROR);
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}
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*llbuf = at->at_ld;
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*listlen = 1;
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return (DW_DLV_OK);
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default:
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DWARF_SET_ERROR(dbg, error, DW_DLE_ATTR_FORM_BAD);
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return (DW_DLV_ERROR);
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}
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default:
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/* Wrong attr supplied. */
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DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
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return (DW_DLV_ERROR);
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}
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}
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int
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dwarf_get_loclist_entry(Dwarf_Debug dbg, Dwarf_Unsigned offset,
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Dwarf_Addr *hipc, Dwarf_Addr *lopc, Dwarf_Ptr *data,
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Dwarf_Unsigned *entry_len, Dwarf_Unsigned *next_entry,
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Dwarf_Error *error)
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{
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Dwarf_Loclist ll, next_ll;
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Dwarf_Locdesc *ld;
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Dwarf_Section *ds;
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int i, ret;
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if (dbg == NULL || hipc == NULL || lopc == NULL || data == NULL ||
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entry_len == NULL || next_entry == NULL) {
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DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
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return (DW_DLV_ERROR);
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}
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ret = _dwarf_loclist_find(dbg, STAILQ_FIRST(&dbg->dbg_cu), offset, &ll,
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error);
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if (ret == DW_DLE_NO_ENTRY) {
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DWARF_SET_ERROR(dbg, error, DW_DLV_NO_ENTRY);
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return (DW_DLV_NO_ENTRY);
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} else if (ret != DW_DLE_NONE)
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return (DW_DLV_ERROR);
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*hipc = *lopc = 0;
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for (i = 0; i < ll->ll_ldlen; i++) {
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ld = ll->ll_ldlist[i];
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if (i == 0) {
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*hipc = ld->ld_hipc;
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*lopc = ld->ld_lopc;
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} else {
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if (ld->ld_lopc < *lopc)
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*lopc = ld->ld_lopc;
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if (ld->ld_hipc > *hipc)
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*hipc = ld->ld_hipc;
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}
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}
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ds = _dwarf_find_section(dbg, ".debug_loc");
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assert(ds != NULL);
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*data = (uint8_t *) ds->ds_data + ll->ll_offset;
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*entry_len = ll->ll_length;
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next_ll = TAILQ_NEXT(ll, ll_next);
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if (next_ll != NULL)
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*next_entry = next_ll->ll_offset;
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else
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*next_entry = ds->ds_size;
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return (DW_DLV_OK);
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}
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int
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dwarf_loclist_from_expr(Dwarf_Debug dbg, Dwarf_Ptr bytes_in,
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Dwarf_Unsigned bytes_len, Dwarf_Locdesc **llbuf, Dwarf_Signed *listlen,
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Dwarf_Error *error)
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{
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Dwarf_Locdesc *ld;
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int ret;
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if (dbg == NULL || bytes_in == NULL || bytes_len == 0 ||
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llbuf == NULL || listlen == NULL) {
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DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
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return (DW_DLV_ERROR);
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}
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ret = _dwarf_loc_fill_locexpr(dbg, &ld, bytes_in, bytes_len,
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dbg->dbg_pointer_size, error);
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if (ret != DW_DLE_NONE)
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return (DW_DLV_ERROR);
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*llbuf = ld;
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*listlen = 1;
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return (DW_DLV_OK);
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}
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int
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dwarf_loclist_from_expr_a(Dwarf_Debug dbg, Dwarf_Ptr bytes_in,
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Dwarf_Unsigned bytes_len, Dwarf_Half addr_size, Dwarf_Locdesc **llbuf,
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Dwarf_Signed *listlen, Dwarf_Error *error)
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{
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Dwarf_Locdesc *ld;
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int ret;
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if (dbg == NULL || bytes_in == NULL || bytes_len == 0 ||
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llbuf == NULL || listlen == NULL) {
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DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
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return (DW_DLV_ERROR);
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}
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if (addr_size != 4 && addr_size != 8) {
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DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
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return (DW_DLV_ERROR);
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}
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ret = _dwarf_loc_fill_locexpr(dbg, &ld, bytes_in, bytes_len, addr_size,
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error);
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if (ret != DW_DLE_NONE)
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return (DW_DLV_ERROR);
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*llbuf = ld;
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*listlen = 1;
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return (DW_DLV_OK);
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}
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