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https://github.com/freebsd/freebsd-src
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cf781b2e16
This brings a number of fixes to elfcopy/strip and DWARF4 improvements. Sponsored by: The FreeBSD Foundation
303 lines
8.3 KiB
C
303 lines
8.3 KiB
C
/*-
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* Copyright (c) 2009,2014 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 3066 2014-06-06 19:36:06Z kaiwang27 $");
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static int
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copy_locdesc(Dwarf_Debug dbg, Dwarf_Locdesc *dst, Dwarf_Locdesc *src,
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Dwarf_Error *error)
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{
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assert(src != NULL && dst != NULL);
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dst->ld_lopc = src->ld_lopc;
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dst->ld_hipc = src->ld_hipc;
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dst->ld_cents = src->ld_cents;
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if (dst->ld_cents > 0) {
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dst->ld_s = calloc(dst->ld_cents, sizeof(Dwarf_Loc));
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if (dst->ld_s == NULL) {
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DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
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return (DW_DLE_MEMORY);
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}
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memcpy(dst->ld_s, src->ld_s, src->ld_cents *
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sizeof(Dwarf_Loc));
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} else
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dst->ld_s = NULL;
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return (DW_DLE_NONE);
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}
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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_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, llbuf, listlen, NULL, 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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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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case DW_FORM_exprloc:
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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 = calloc(1, sizeof(Dwarf_Locdesc *));
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if (*llbuf == NULL) {
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DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
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return (DW_DLV_ERROR);
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}
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(*llbuf)[0] = calloc(1, sizeof(Dwarf_Locdesc));
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if ((*llbuf)[0] == NULL) {
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free(*llbuf);
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DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
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return (DW_DLV_ERROR);
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}
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if (copy_locdesc(dbg, (*llbuf)[0], at->at_ld, error) !=
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DW_DLE_NONE) {
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free((*llbuf)[0]);
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free(*llbuf);
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return (DW_DLV_ERROR);
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}
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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_Locdesc **_llbuf;
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int i, ret;
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ret = dwarf_loclist_n(at, &_llbuf, listlen, error);
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if (ret != DW_DLV_OK)
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return (ret);
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/* Only return the first location description of the list. */
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*llbuf = _llbuf[0];
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/* Free the rest of the list. */
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for (i = 1; i < *listlen; i++) {
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if (_llbuf[i]->ld_s)
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free(_llbuf[i]->ld_s);
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free(_llbuf[i]);
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}
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free(_llbuf);
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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_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_Locdesc *ld, **llbuf;
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Dwarf_Section *ds;
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Dwarf_Signed listlen;
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int i, ret;
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/*
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* Note that this API sometimes will not work correctly because
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* it assumes that all units have the same pointer size and offset
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* size.
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*/
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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,
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&llbuf, &listlen, entry_len, 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 < listlen; i++) {
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ld = llbuf[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 + offset;
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*next_entry = offset + *entry_len;
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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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return (dwarf_loclist_from_expr_a(dbg, bytes_in, bytes_len,
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dbg->dbg_pointer_size, llbuf, listlen, error));
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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_Half offset_size;
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Dwarf_Small version;
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/*
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* Obtain offset size and DWARF version from the current
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* Compilation Unit or Type Unit. These values are needed
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* for correctly parsing DW_OP_GNU_implicit_pointer operator.
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*
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* Note that dwarf_loclist_from_expr_b() should be used instead
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* if the application knows correct values for offset size
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* and DWARF version.
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*/
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if (dbg->dbg_cu_current) {
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offset_size = dbg->dbg_cu_current->cu_length_size == 4 ? 4 : 8;
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version = dbg->dbg_cu_current->cu_version;
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} else if (dbg->dbg_tu_current) {
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offset_size = dbg->dbg_tu_current->cu_length_size == 4 ? 4 : 8;
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version = dbg->dbg_tu_current->cu_version;
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} else {
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/* Default values if no CU/TU context. */
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offset_size = 4;
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version = 2; /* DWARF2 */
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}
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return (dwarf_loclist_from_expr_b(dbg, bytes_in, bytes_len, addr_size,
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offset_size, version, llbuf, listlen, error));
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}
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int
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dwarf_loclist_from_expr_b(Dwarf_Debug dbg, Dwarf_Ptr bytes_in,
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Dwarf_Unsigned bytes_len, Dwarf_Half addr_size, Dwarf_Half offset_size,
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Dwarf_Small version, 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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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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if (offset_size != 4 && offset_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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offset_size, version, 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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