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libdwelf: New DWARF ELF Low-level Functions. Add dwelf_elf_gnu_debuglink.
New public header elfutils/libdwelf.h for low-level DWARF/ELF helper functions. The new function dwelf_elf_gnu_debuglink returns the name and crc as found in the .gnu_debuglink section of an ELF file. Signed-off-by: Mark Wielaard <mjw@redhat.com>
This commit is contained in:
Mark Wielaard
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2014-04-11 Mark Wielaard <mjw@redhat.com>
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* Makefile.am: New file.
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* libdwelf.h: Likewise.
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* libdwelfP.h: Likewise.
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* dwelf_elf_gnu_debuglink.c: Likewise.
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## Makefile.am for libdwelf library subdirectory in elfutils.
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##
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## Process this file with automake to create Makefile.in
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##
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## Copyright (C) 2014 Red Hat, Inc.
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## This file is part of elfutils.
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##
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## This file is free software; you can redistribute it and/or modify
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## it under the terms of either
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##
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## * the GNU Lesser General Public License as published by the Free
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## Software Foundation; either version 3 of the License, or (at
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## your option) any later version
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##
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## or
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##
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## * the GNU General Public License as published by the Free
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## Software Foundation; either version 2 of the License, or (at
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## your option) any later version
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##
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## or both in parallel, as here.
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##
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## elfutils is distributed in the hope that it will be useful, but
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## WITHOUT ANY WARRANTY; without even the implied warranty of
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## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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## General Public License for more details.
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##
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## You should have received copies of the GNU General Public License and
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## the GNU Lesser General Public License along with this program. If
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## not, see <http://www.gnu.org/licenses/>.
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##
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include $(top_srcdir)/config/eu.am
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AM_CPPFLAGS += -I$(srcdir)/../libelf -I$(srcdir)/../libdw
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VERSION = 1
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noinst_LIBRARIES = libdwelf.a libdwelf_pic.a
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pkginclude_HEADERS = libdwelf.h
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noinst_HEADERS = libdwelfP.h
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libdwelf_a_SOURCES = dwelf_elf_gnu_debuglink.c
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libdwelf = $(libdw)
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libdw = ../libdw/libdw.so
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libelf = ../libelf/libelf.so
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libebl = ../libebl/libebl.a
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libeu = ../lib/libeu.a
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libdwelf_pic_a_SOURCES =
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am_libdwelf_pic_a_OBJECTS = $(libdwelf_a_SOURCES:.c=.os)
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CLEANFILES += $(am_libdwelf_pic_a_OBJECTS)
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@@ -0,0 +1,99 @@
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/* Returns the file name and crc stored in the .gnu_debuglink if found.
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Copyright (C) 2014 Red Hat, Inc.
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This file is part of elfutils.
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This file is free software; you can redistribute it and/or modify
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it under the terms of either
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at
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your option) any later version
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or
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* the GNU General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at
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your option) any later version
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or both in parallel, as here.
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elfutils is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received copies of the GNU General Public License and
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the GNU Lesser General Public License along with this program. If
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not, see <http://www.gnu.org/licenses/>. */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include "libdwelfP.h"
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const char *
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dwelf_elf_gnu_debuglink (Elf *elf, GElf_Word *crc)
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{
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size_t shstrndx;
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if (elf_getshdrstrndx (elf, &shstrndx) < 0)
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return NULL;
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Elf_Scn *scn = NULL;
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while ((scn = elf_nextscn (elf, scn)) != NULL)
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{
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GElf_Shdr shdr_mem;
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GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
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if (shdr == NULL)
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return NULL;
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const char *name = elf_strptr (elf, shstrndx, shdr->sh_name);
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if (name == NULL)
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return NULL;
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if (!strcmp (name, ".gnu_debuglink"))
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break;
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}
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if (scn == NULL)
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return NULL;
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/* Found the .gnu_debuglink section. Extract its contents. */
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Elf_Data *rawdata = elf_rawdata (scn, NULL);
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if (rawdata == NULL)
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return NULL;
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/* The CRC comes after the zero-terminated file name,
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(aligned up to 4 bytes) at the end of the section data. */
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if (rawdata->d_size <= sizeof *crc
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|| memchr (rawdata->d_buf, '\0', rawdata->d_size - sizeof *crc) == NULL)
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return NULL;
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Elf_Data crcdata =
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{
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.d_type = ELF_T_WORD,
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.d_buf = crc,
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.d_size = sizeof *crc,
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.d_version = EV_CURRENT,
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};
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Elf_Data conv =
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{
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.d_type = ELF_T_WORD,
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.d_buf = rawdata->d_buf + rawdata->d_size - sizeof *crc,
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.d_size = sizeof *crc,
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.d_version = EV_CURRENT,
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};
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GElf_Ehdr ehdr_mem;
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GElf_Ehdr *ehdr = gelf_getehdr (elf, &ehdr_mem);
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if (ehdr == NULL)
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return NULL;
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Elf_Data *d = gelf_xlatetom (elf, &crcdata, &conv, ehdr->e_ident[EI_DATA]);
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if (d == NULL)
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return NULL;
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assert (d == &crcdata);
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return rawdata->d_buf;
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}
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INTDEF(dwelf_elf_gnu_debuglink)
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@@ -0,0 +1,54 @@
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/* Interfaces for libdwelf. DWARF ELF Low-level Functions.
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Copyright (C) 2014 Red Hat, Inc.
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This file is part of elfutils.
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This file is free software; you can redistribute it and/or modify
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it under the terms of either
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at
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your option) any later version
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or
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* the GNU General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at
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your option) any later version
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or both in parallel, as here.
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elfutils is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received copies of the GNU General Public License and
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the GNU Lesser General Public License along with this program. If
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not, see <http://www.gnu.org/licenses/>. */
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#ifndef _LIBDWELF_H
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#define _LIBDWELF_H 1
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#include "libdw.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* DWARF ELF Low-level Functions (dwelf).
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Functions starting with dwelf_elf will take a (libelf) Elf object as
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first argument and might set elf_errno on error. Functions starting
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with dwelf_dwarf will take a (libdw) Dwarf object as first argument
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and might set dwarf_errno on error. */
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/* Returns the name and the CRC32 of the separate debug file from the
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.gnu_debuglink section if found in the ELF. Return NULL if the ELF
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file didn't have a .gnu_debuglink section, had malformed data in the
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section or some other error occured. */
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extern const char *dwelf_elf_gnu_debuglink (Elf *elf, GElf_Word *crc);
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#ifdef __cplusplus
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}
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#endif
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#endif /* libdwelf.h */
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@@ -0,0 +1,40 @@
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/* Internal definitions for libdwelf. DWARF ELF Low-level Functions.
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Copyright (C) 2014 Red Hat, Inc.
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This file is part of elfutils.
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This file is free software; you can redistribute it and/or modify
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it under the terms of either
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at
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your option) any later version
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or
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* the GNU General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at
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your option) any later version
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||||
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or both in parallel, as here.
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elfutils is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received copies of the GNU General Public License and
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the GNU Lesser General Public License along with this program. If
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not, see <http://www.gnu.org/licenses/>. */
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#ifndef _LIBDWELFP_H
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#define _LIBDWELFP_H 1
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#include <libdwelf.h>
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#include "../libdw/libdwP.h" /* We need its INTDECLs. */
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#include <assert.h>
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#include <string.h>
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/* Avoid PLT entries. */
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INTDECL (dwelf_elf_gnu_debuglink)
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#endif /* libdwelfP.h */
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