mirror of
https://github.com/freebsd/freebsd-src
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ae500c1ff8
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
160 lines
4.3 KiB
Groff
160 lines
4.3 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_abbrev_entry.3 3644 2018-10-15 19:55:01Z jkoshy $
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.\"
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.Dd April 02, 2011
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.Dt DWARF_GET_ABBREV_ENTRY 3
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.Os
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.Sh NAME
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.Nm dwarf_get_abbrev_entry
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.Nd retrieve attribute information from an abbreviation descriptor
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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 int
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.Fo dwarf_get_abbrev_entry
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.Fa "Dwarf_Abbrev abbrev"
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.Fa "Dwarf_Signed ndx"
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.Fa "Dwarf_Half *code"
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.Fa "Dwarf_Signed *form"
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.Fa "Dwarf_Off *offset"
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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_abbrev_entry
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retrieves attribute information from a DWARF abbreviation descriptor.
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.Pp
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Argument
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.Ar abbrev
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should be a valid abbreviation descriptor, as returned by function
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.Xr dwarf_get_abbrev 3 .
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.Pp
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Argument
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.Ar ndx
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specifies the 0-based index of the attribute.
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The total count of the attributes contained in the abbreviation
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entry can be retrieved using the function
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.Xr dwarf_get_abbrev 3 .
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.Pp
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Argument
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.Ar code
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should point to a location which will hold a returned
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attribute code.
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.Pp
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Argument
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.Ar form
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should point to a location which will hold the returned
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form of the attribute.
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.Pp
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Argument
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.Ar offset
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should point to a location which will hold a returned offset, relative
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to the
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.Dq ".debug_abbrev"
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section, for the specified attribute.
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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 return an error descriptor in case
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of an error.
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.Sh RETURN VALUES
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Function
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.Fn dwarf_get_abbrev_entry
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returns
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.Dv DW_DLV_OK
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when it succeeds.
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It returns
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.Dv DW_DLV_NO_ENTRY
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if the attribute index specified by argument
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.Ar ndx
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is out of range.
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In case of an error, it returns
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.Dv DW_DLV_ERROR
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and sets the argument
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.Ar err .
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.Sh EXAMPLES
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To loop through all the attribute entries contained in the
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abbreviation section, use:
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.Bd -literal -offset indent
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Dwarf_Debug dbg;
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Dwarf_Abbrev ab;
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Dwarf_Off aboff, atoff;
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Dwarf_Signed form;
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Dwarf_Half attr;
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Dwarf_Unsigned length, attr_count;
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Dwarf_Error de;
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int i, ret;
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/* ...allocate 'dbg' using dwarf_init(3) ... */
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while ((ret = dwarf_next_cu_header(dbg, NULL, NULL, &aboff,
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NULL, NULL, &de)) == DW_DLV_OK) {
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while ((ret = dwarf_get_abbrev(dbg, aboff, &ab, &length,
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&attr_count, &de)) == DW_DLV_OK) {
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if (length == 1) /* Last entry. */
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break;
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aboff += length;
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for (i = 0; (Dwarf_Unsigned) i < attr_count; i++) {
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if (dwarf_get_abbrev_entry(ab, i,
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&attr, &form, &atoff, &de) != DW_DLV_OK) {
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warnx("dwarf_get_abbrev_entry failed:"
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" %s", dwarf_errmsg(de));
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continue;
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}
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/* .. use the retrieved information ... */
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}
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}
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if (ret != DW_DLV_OK)
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warnx("dwarf_get_abbrev: %s", dwarf_errmsg(de));
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}
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if (ret == DW_DLV_ERROR)
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warnx("dwarf_next_cu_header: %s", dwarf_errmsg(de));
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.Ed
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.Sh ERRORS
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Function
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.Fn dwarf_get_abbrev_entry
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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 abbrev ,
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.Ar code ,
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.Ar form
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or
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.Ar offset
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was NULL.
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.It Bq Er DW_DLE_NO_ENTRY
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The attribute index specified by argument
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.Ar ndx
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was out of range.
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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_get_abbrev 3
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