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
137 lines
3.6 KiB
Groff
137 lines
3.6 KiB
Groff
.\" Copyright (c) 2010 Joseph Koshy
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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_formref.3 3640 2018-10-14 14:09:13Z jkoshy $
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.\"
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.Dd June 21, 2010
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.Dt DWARF_FORMREF 3
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.Os
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.Sh NAME
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.Nm dwarf_formref ,
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.Nm dwarf_global_formref
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.Nd retrieve offsets for REFERENCE class attributes
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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_formref
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.Fa "Dwarf_Attribute attr"
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.Fa "Dwarf_Off *retoffset"
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.Fa "Dwarf_Error *err"
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.Fc
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.Ft int
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.Fo dwarf_global_formref
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.Fa "Dwarf_Attribute attr"
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.Fa "Dwarf_Off *retoffset"
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.Fa "Dwarf_Error *err"
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.Fc
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.Sh DESCRIPTION
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These functions return the offsets associated with a DWARF attribute
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descriptor.
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.Pp
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Function
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.Fn dwarf_formref
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returns the compilation unit relative offset of the descriptor
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referenced by argument
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.Ar attr
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in the location pointed to by argument
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.Ar retoffset .
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Argument
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.Ar attr
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must be a reference that is local to a compilation unit.
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Permitted forms for argument
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.Ar attr
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are
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.Dv DW_FORM_ref1 ,
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.Dv DW_FORM_ref2 ,
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.Dv DW_FORM_ref4 ,
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.Dv DW_FORM_ref8
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and
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.Dv DW_FORM_ref_udata .
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.Pp
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Function
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.Fn dwarf_global_formref
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returns the section-relative offset of the descriptor referenced by
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argument
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.Ar attr
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in the location pointed to by argument
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.Ar retoffset .
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Argument
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.Ar attr
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should be a legal
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.Sy REFERENCE
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class form.
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Permitted forms for argument
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.Ar attr
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are:
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.Dv DW_FORM_ref_addr ,
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.Dv DW_FORM_ref_udata ,
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.Dv DW_FORM_ref1 ,
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.Dv DW_FORM_ref2 ,
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.Dv DW_FORM_ref4 ,
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.Dv DW_FORM_ref8
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and
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.Dv DW_FORM_sec_offset .
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The returned offset is relative to the start of the
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.Dq .debug_info
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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 return an error descriptor in case
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of an error.
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.Sh RETURN VALUES
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These functions return
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.Dv DW_DLV_OK
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on success.
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In case of an error, these functions return
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.Dv DW_DLV_ERROR
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and sets argument
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.Ar err .
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.Sh ERRORS
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These functions may fail with the following errors:
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.Bl -tag -width ".Bq Er DW_DLE_ATTR_FORM_BAD"
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.It Bq Er DW_DLE_ARGUMENT
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Either of arguments
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.Ar attr
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or
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.Ar retoffset
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was NULL.
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.It Bq Er DW_DLE_ATTR_FORM_BAD
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The attribute referenced by argument
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.Ar attr
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was not of a permitted kind.
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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_attr 3 ,
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.Xr dwarf_formblock 3 ,
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.Xr dwarf_formflag 3 ,
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.Xr dwarf_formsdata 3 ,
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.Xr dwarf_formsig8 3 ,
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.Xr dwarf_formstring 3 ,
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.Xr dwarf_formudata 3 ,
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.Xr dwarf_hasattr 3
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