b54d7a9715
Highlights: - Make sure that only TLS sections are sorted into TLS segment. - Fixed multiple errors in "Section to Segment mapping". - Man page updates - ar improvements - elfcopy: avoid filter_reloc uninitialized variable for rela - elfcopy: avoid stripping relocations from static binaries - readelf: avoid printing directory in front of absolute path - readelf: add NT_FREEBSD_FEATURE_CTL FreeBSD note type - test improvements NOTES: Some of these changes originated in FreeBSD and simply reduce diffs between contrib and vendor. ELF Tool Chain ar is not (currently) used in FreeBSD, and there are improvements in both FreeBSD and ELF Tool Chain ar that are not in the other. Sponsored by: The FreeBSD Foundation
158 lines
4.6 KiB
Groff
158 lines
4.6 KiB
Groff
.\" Copyright (c) 2011 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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.\" $Id: dwarf_get_section_bytes.3 3644 2018-10-15 19:55:01Z jkoshy $
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.\"
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.Dd August 26, 2011
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.Dt DWARF_GET_SECTION_BYTES 3
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.Os
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.Sh NAME
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.Nm dwarf_get_section_bytes
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.Nd retrieve ELF section byte streams
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.Sh LIBRARY
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.Lb libdwarf
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.Sh SYNOPSIS
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.In libdwarf.h
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.Ft Dwarf_Ptr
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.Fo dwarf_get_section_bytes
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.Fa "Dwarf_P_Debug dbg"
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.Fa "Dwarf_Signed dwarf_section"
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.Fa "Dwarf_Signed *elf_section_index"
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.Fa "Dwarf_Unsigned *length"
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.Fa "Dwarf_Error *err"
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.Fc
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.Sh DESCRIPTION
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Function
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.Fn dwarf_get_section_bytes
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returns the ELF section byte streams generated by a prior call
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to function
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.Xr dwarf_transform_to_disk_form 3 .
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.Pp
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Each call to function
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.Fn dwarf_get_section_bytes
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will return the byte stream for one ELF section.
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The first call to this function will always return the first ELF
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section, and the subsequent calls will return the rest of sections
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in the order when they were generated, until the last one.
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The total number of sections generated is returned by the function
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.Xr dwarf_transform_to_disk_form 3 .
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.Pp
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Argument
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.Ar dbg
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should reference a DWARF producer instance allocated using the
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functions
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.Xr dwarf_producer_init 3
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or
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.Xr dwarf_producer_init_b 3 .
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.Pp
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Argument
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.Ar dwarf_section
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is currently ignored.
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.Pp
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Argument
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.Ar elf_section_index
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should point to a location which will be set to the section index value
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of the returned ELF section.
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.Pp
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Argument
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.Ar length
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should point to a location which will hold the length in bytes of the
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returned ELF section.
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.Pp
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If argument
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.Ar err
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is not NULL, it will be used to store error information in case of an
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error.
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.Ss Memory Management
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The memory areas used for the returned ELF section byte streams should
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be freed using the function
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.Fn dwarf_producer_finish .
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.Sh RETURN VALUES
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On success, function
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.Fn dwarf_get_section_bytes
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returns a pointer to a ELF section byte stream.
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In case of an error, function
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.Fn dwarf_get_section_bytes
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will return NULL and set the argument
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.Ar err .
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.Sh EXAMPLES
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To generate and retrieve ELF section byte streams, use:
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.Bd -literal -offset indent
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Dwarf_P_Debug dbg;
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Dwarf_Signed count, i, sec_index;
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Dwarf_Unsigned len;
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Dwarf_Ptr bytes;
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Dwarf_Error de;
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/* ... Assume that `dbg' refers to a DWARF producer instance,
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* and that application code has added DWARF debugging
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* information to the producer instance. ...
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*/
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if ((count = dwarf_transform_to_disk_form(dbg, &de)) ==
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DW_DLV_NOCOUNT) {
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warnx("dwarf_transform_to_disk_form failed: %s",
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dwarf_errmsg(-1));
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return;
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}
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/* Retrieve section data. */
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for (i = 0; i < count; i++) {
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bytes = dwarf_get_section_bytes(dbg, i, &sec_index, &len,
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&de);
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if (bytes == NULL) {
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warnx("dwarf_get_section_bytes failed: %s",
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dwarf_errmsg(-1));
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continue;
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}
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/* ... use the returned byte stream ... */
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}
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/* Release resources. */
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dwarf_producer_finish(dbg, &de);
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.Ed
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.Sh ERRORS
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Function
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.Fn dwarf_get_section_bytes
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can fail with:
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.Bl -tag -width ".Bq Er DW_DLE_NO_ENTRY"
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.It Bq Er DW_DLE_ARGUMENT
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One of the arguments
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.Ar dbg ,
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.Ar elf_section_index ,
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or
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.Ar length
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was NULL.
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.It Bq Er DW_DLE_NO_ENTRY
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There were no more ELF sections to retrieve, or the function was
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called before a call to
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.Xr dwarf_transform_to_disk_form 3 .
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.El
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.Sh SEE ALSO
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.Xr dwarf 3 ,
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.Xr dwarf_producer_finish 3 ,
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.Xr dwarf_producer_init 3 ,
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.Xr dwarf_producer_init_b 3 ,
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.Xr dwarf_reset_section_bytes 3 ,
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.Xr dwarf_transform_to_disk_form 3
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