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
149 lines
4 KiB
Groff
149 lines
4 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_aranges.3 3644 2018-10-15 19:55:01Z jkoshy $
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.\"
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.Dd November 9, 2011
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.Dt DWARF_GET_ARANGES 3
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.Os
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.Sh NAME
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.Nm dwarf_get_aranges
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.Nd retrieve program address space mappings
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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_aranges
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.Fa "Dwarf_Debug dbg"
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.Fa "Dwarf_Arange **ar_list"
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.Fa "Dwarf_Signed *ar_cnt"
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.Fa "Dwarf_Error *err"
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.Fc
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.Sh DESCRIPTION
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The function
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.Fn dwarf_get_aranges
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retrieves address range information from the
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.Dq ".debug_aranges"
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DWARF section.
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Information about address ranges is returned using opaque descriptors
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of type
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.Vt Dwarf_Arange ,
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.Pp
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Argument
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.Ar dbg
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should reference a DWARF debug context allocated using
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.Xr dwarf_init 3 .
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.Pp
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Argument
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.Ar ar_list
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should point to a location which will be set to a pointer to an array
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of
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.Vt Dwarf_Arange
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descriptors.
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.Pp
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Argument
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.Ar ar_cnt
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should point to a location which will be set to the number of
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descriptors returned.
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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 area used for the array returned in argument
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.Ar ar_list
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is owned by
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.Lb libdwarf .
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Application code should not attempt to directly free this area.
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Portable applications should instead use
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.Xr dwarf_dealloc 3
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to indicate that the memory area may be freed.
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.Sh RETURN VALUES
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Function
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.Fn dwarf_get_aranges
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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 there is no
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.Dq ".debug_aranges"
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section associated with the specified debugging context.
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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 address lookup table entries, use:
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.Bd -literal -offset indent
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Dwarf_Debug dbg;
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Dwarf_Addr start;
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Dwarf_Arange *aranges;
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Dwarf_Off die_off;
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Dwarf_Signed i, cnt;
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Dwarf_Unsigned length;
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Dwarf_Error de;
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if (dwarf_get_aranges(dbg, &aranges, &cnt, &de) != DW_DLV_OK)
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errx(EXIT_FAILURE, "dwarf_get_aranges: %s",
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dwarf_errmsg(de));
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for (i = 0; i < cnt; i++) {
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if (dwarf_get_arange_info(aranges[i], &start, &length,
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&die_off, &de) != DW_DLV_OK) {
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warnx("dwarf_get_arange_info: %s",
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dwarf_errmsg(de));
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continue;
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}
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/* Do something with the returned information. */
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}
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.Ed
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.Sh ERRORS
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Function
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.Fn dwarf_get_aranges
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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 ar_list
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or
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.Ar ar_cnt
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was NULL.
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.It Bq Er DW_DLE_NO_ENTRY
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The debugging context
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.Ar dbg
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did not contain a
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.Dq ".debug_aranges"
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string section.
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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_arange 3 ,
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.Xr dwarf_get_arange_cu_header_offset 3 ,
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.Xr dwarf_get_arange_info 3 ,
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.Xr dwarf_get_cu_die_offset 3
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