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
259 lines
6.7 KiB
Groff
259 lines
6.7 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_ranges.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_RANGES 3
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.Os
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.Sh NAME
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.Nm dwarf_get_ranges
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.Nd retrieve non-contiguous address ranges
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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_ranges
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.Fa "Dwarf_Debug dbg"
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.Fa "Dwarf_Off offset"
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.Fa "Dwarf_Ranges **ranges"
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.Fa "Dwarf_Signed *cnt"
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.Fa "Dwarf_Unsigned *byte_cnt"
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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_ranges_a
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.Fa "Dwarf_Debug dbg"
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.Fa "Dwarf_Off offset"
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.Fa "Dwarf_Die die"
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.Fa "Dwarf_Ranges **ranges"
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.Fa "Dwarf_Signed *cnt"
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.Fa "Dwarf_Unsigned *byte_cnt"
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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_ranges
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retrieves information about the non-contiguous address ranges associated
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with a DWARF debugging information entry.
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Information about address ranges is returned as an array of
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descriptors of type
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.Vt Dwarf_Ranges ,
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with each
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.Vt Dwarf_Ranges
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descriptor describing one address range entry.
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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 offset
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is an offset, relative to the
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.Dq ".debug_ranges"
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section, to the start of the desired list of address ranges.
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The offset of an address ranges list is indicated by the
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.Dv DW_AT_ranges
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attribute of a debugging information entry.
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.Pp
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Argument
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.Ar die
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(function
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.Fn dwarf_get_ranges_a
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only) is ignored in this implementation; see the section
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.Sx "Compatibility Notes"
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below.
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.Pp
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Argument
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.Ar ranges
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should point to a location that will be set to a pointer to an array
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of
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.Vt Dwarf_Ranges
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descriptors.
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.Pp
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Argument
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.Ar cnt
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should point to a location that will be set to the number of entries
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returned.
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If argument
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.Ar byte_cnt
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is not NULL, it will be set to the number of bytes occupied by the
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returned entries in the
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.Dq ".debug_ranges"
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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
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of an error.
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.Pp
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.Vt Dwarf_Ranges
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descriptors are defined in the header file
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.In libdwarf.h ,
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and consists of the following fields:
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.Bl -tag -width ".Va dwr_addr1"
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.It Va dwr_addr1
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The first address offset, whose meaning depends on the type of the
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entry.
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.It Va dwr_addr2
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The second address offset, whose meaning depends on the type of the
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entry.
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.It Va dwr_type
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The type of this address range entry:
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.Bl -tag -width ".Dv DW_RANGES_ENTRY" -compact
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.It Dv DW_RANGES_ENTRY
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A range list entry.
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For this type of entry, the fields
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.Va dwr_addr1
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and
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.Va dwr_addr2
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hold the beginning and ending offsets of the address range, respectively.
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.It Dv DW_RANGES_ADDRESS_SELECTION
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A base address selection entry.
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For this type of entry, the field
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.Va dwr_addr1
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is the value of the largest representable address offset, and
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.Va dwr_addr2
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is a base address for the beginning and ending address offsets of
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subsequent address range entries in the list.
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.It Dv DW_RANGES_END
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An end of list mark.
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Both
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.Va dwr_addr1
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and
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.Va dwr_addr2
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are set to 0.
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.El
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.El
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.Ss Memory Management
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The memory area used for the array of
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.Vt Dwarf_Ranges
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descriptors returned in argument
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.Ar ranges
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is owned by the
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.Lb libdwarf .
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The application should not attempt to directly free this pointer.
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Portable code should instead use
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.Fn dwarf_ranges_dealloc
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to indicate that the memory may be freed.
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.Sh RETURN VALUES
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These functions
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return
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.Dv DW_DLV_OK
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when they succeed.
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They return
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.Dv DW_DLV_NO_ENTRY
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if there is no address range list at the specified offset
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.Ar offset .
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In case of an error, they return
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.Dv DW_DLV_ERROR
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and set the argument
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.Ar err .
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.Sh EXAMPLES
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To retrieve the address range list associated with a debugging
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information entry, use:
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.Bd -literal -offset indent
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Dwarf_Debug dbg;
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Dwarf_Die die;
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Dwarf_Error de;
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Dwarf_Addr base;
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Dwarf_Attribute *attr_list;
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Dwarf_Ranges *ranges;
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Dwarf_Signed cnt;
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Dwarf_Unsigned off, attr_count, bytecnt;
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int i, j;
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if ((ret = dwarf_attrlist(die, &attr_list, &attr_count, &de)) !=
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DW_DLV_OK)
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errx(EXIT_FAILURE, "dwarf_attrlist failed: %s",
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dwarf_errmsg(de));
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for (i = 0; (Dwarf_Unsigned) i < attr_count; i++) {
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if (dwarf_whatattr(attr_list[i], &attr, &de) != DW_DLV_OK) {
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warnx("dwarf_whatattr failed: %s",
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dwarf_errmsg(de));
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continue;
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}
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if (attr != DW_AT_ranges)
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continue;
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if (dwarf_formudata(attr_list[i], &off, &de) != DW_DLV_OK) {
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warnx("dwarf_formudata failed: %s",
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dwarf_errmsg(de));
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continue;
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}
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if (dwarf_get_ranges(dbg, (Dwarf_Off) off, &ranges, &cnt,
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&bytecnt, &de) != DW_DLV_OK)
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continue;
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for (j = 0; j < cnt; j++) {
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if (ranges[j].dwr_type == DW_RANGES_END)
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break;
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else if (ranges[j].dwr_type ==
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DW_RANGES_ADDRESS_SELECTION)
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base = ranges[j].dwr_addr2;
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else {
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/*
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* DW_RANGES_ENTRY entry.
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* .. Use dwr_addr1 and dwr_addr2 ..
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*/
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}
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}
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}
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.Ed
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.Sh COMPATIBILITY
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Function
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.Fn dwarf_get_ranges_a
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is identical to
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.Fn dwarf_get_ranges ,
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except that it requires one additional argument
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.Ar die
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denoting the debugging information entry associated with
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the address range list.
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In this implementation of the
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.Lb libdwarf ,
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the argument
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.Ar die
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is ignored, and function
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.Fn dwarf_get_ranges_a
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is only provided for compatibility with other implementations of the
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DWARF(3) API.
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.Sh ERRORS
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These function 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 ranges
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or
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.Ar cnt
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was NULL.
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.It Bq Er DW_DLE_NO_ENTRY
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There is no address range list at the specified offset
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.Ar 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_ranges_dealloc 3
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