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
207 lines
5.8 KiB
Groff
207 lines
5.8 KiB
Groff
.\" Copyright (c) 2010,2014 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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.\" $Id: dwarf_dieoffset.3 3640 2018-10-14 14:09:13Z jkoshy $
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.\"
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.Dd December 21, 2014
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.Dt DWARF_DIEOFFSET 3
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.Os
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.Sh NAME
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.Nm dwarf_die_CU_offset ,
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.Nm dwarf_die_CU_offset_range ,
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.Nm dwarf_dieoffset ,
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.Nm dwarf_get_cu_die_offset_given_cu_header_offset ,
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.Nm dwarf_get_cu_die_offset_given_cu_header_offset_b
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.Nd return offsets of DWARF debugging information entries
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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_die_CU_offset
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.Fa "Dwarf_Die die"
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.Fa "Dwarf_Off *ret_offset"
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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_die_CU_offset_range
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.Fa "Dwarf_Die die"
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.Fa "Dwarf_Off *cu_offset"
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.Fa "Dwarf_Off *cu_length"
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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_dieoffset
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.Fa "Dwarf_Die die"
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.Fa "Dwarf_Off *ret_offset"
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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_get_cu_die_offset_given_cu_header_offset
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.Fa "Dwarf_Debug dbg"
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.Fa "Dwarf_Off in_cu_header_offset"
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.Fa "Dwarf_Off *out_cu_die_offset"
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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_get_cu_die_offset_given_cu_header_offset_b
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.Fa "Dwarf_Debug dbg"
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.Fa "Dwarf_Off in_cu_header_offset"
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.Fa "Dwarf_Bool is_info"
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.Fa "Dwarf_Off *out_cu_die_offset"
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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 are used to retrieve offsets for DWARF debugging
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information entries.
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.Pp
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Function
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.Fn dwarf_die_CU_offset
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returns the offset of the debugging information entry referenced by
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argument
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.Ar die
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relative to the start of its containing compilation unit.
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Argument
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.Ar ret_offset
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should point to the location that is to hold the returned offset.
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If argument
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.Ar err
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is non-NULL, it will be used to return an error descriptor in case of
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an error.
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.Pp
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Function
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.Fn dwarf_die_CU_offset_range
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returns the section-relative offset and length of the compilation unit
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containing the debugging information entry referenced by argument
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.Ar die .
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Argument
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.Ar cu_offset
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should point to a location that will hold the returned offset.
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Argument
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.Ar cu_length
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should point to a location that will hold the returned length of the
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compilation unit.
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If argument
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.Ar err
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is non-NULL, it will be used to return an error descriptor in case of
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an error.
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.Pp
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Function
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.Fn dwarf_dieoffset
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retrieves the section-relative offset of the debugging information
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entry referenced by argument
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.Ar die .
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Argument
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.Ar ret_offset
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should point to a location that is to hold the returned
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section-relative offset.
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If argument
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.Ar err
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is non-NULL, it will be used to return an error descriptor in case of
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an error.
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.Pp
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Function
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.Fn dwarf_get_cu_die_offset_given_cu_header_offset
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returns the offset for the first debugging information entry for a
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compilation unit, given an offset to the header of the compilation
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unit.
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Argument
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.Ar dbg
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should reference a valid debugging context allocated using
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.Xr dwarf_init 3 .
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Argument
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.Ar in_cu_header_offset
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contains the offset to the start of a compilation unit.
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Argument
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.Ar out_cu_die_offset
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points to a location that will hold the returned offset.
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If argument
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.Ar err
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is non-NULL, it will be used to return an error descriptor in case of
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an error.
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.Pp
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Function
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.Fn dwarf_get_cu_die_offset_given_cu_header_offset_b
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behaves identically to the function
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.Fn dwarf_get_cu_die_offset_given_cu_header_offset
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when the argument
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.Ar is_info
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is non-zero.
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When the argument
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.Ar is_info
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is zero, function
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.Fn dwarf_get_cu_die_offset_given_cu_header_offset_b
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returns the offset for the first debugging information entry for a
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type unit, given an offset to the header of the type unit in argument
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.Ar in_cu_header_offset .
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Argument
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.Ar out_cu_die_offset
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points to a location that will hold the returned offset.
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If the argument
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.Ar err
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is non-NULL, it will be used to return an error descriptor in case of
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an error.
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.Sh RETURN VALUES
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On success, these functions return
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.Dv DW_DLV_OK .
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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 set argument
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.Ar err .
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.Pp
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Function
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.Fn dwarf_get_cu_die_offset_given_cu_header_offset
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and
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.Fn dwarf_get_cu_die_offset_given_cu_header_offset_b
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returns
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.Dv DW_DLV_NO_ENTRY
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and sets argument
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.Ar err
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if there is no compilation or type unit located at the
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offset specified in argument
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.Ar in_cu_header_offset .
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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_ARGUMENT"
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.It Bq Er DW_DLE_ARGUMENT
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One of the arguments
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.Va cu_length ,
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.Va cu_offset ,
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.Va dbg ,
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.Va die ,
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.Va out_cu_die_offset
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or
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.Va ret_offset
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was NULL.
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.It Bq Er DW_DLE_NO_ENTRY
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Argument
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.Ar in_cu_header_offset
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specified an unknown offset.
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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_next_cu_header 3 ,
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.Xr dwarf_offdie 3 ,
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.Xr dwarf_offdie_b 3
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