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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
229 lines
6.7 KiB
Groff
229 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_relocation_info.3 3644 2018-10-15 19:55:01Z jkoshy $
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.\"
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.Dd September 3, 2011
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.Dt DWARF_GET_RELOCATION_INFO 3
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.Os
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.Sh NAME
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.Nm dwarf_get_relocation_info
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.Nd retrieve generated relocation arrays
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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_relocation_info
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.Fa "Dwarf_P_Debug dbg"
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.Fa "Dwarf_Signed *elf_section_index"
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.Fa "Dwarf_Signed *elf_section_link"
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.Fa "Dwarf_Unsigned *reloc_entry_count"
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.Fa "Dwarf_Relocation_Data *reloc_buf"
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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_relocation_info
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is used to retrieve the relocation arrays generated by a prior call to
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.Xr dwarf_transform_to_disk_form 3 .
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.Pp
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Each call to this function retrieves the next available relocation
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array.
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Application code should call this function repeatly to retrieve all
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the relocation arrays.
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The total number of generated relocation arrays retrievable
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by this function may be obtained by calling function
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.Xr dwarf_get_relocation_info_count 3 .
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.Pp
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Argument
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.Ar dbg
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should reference a DWARF producer instance allocated using
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.Xr dwarf_producer_init 3 in sequence.
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or
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.Xr dwarf_producer_init_b 3 .
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The
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.Dv DW_DLC_SYMBOLIC_RELOCATIONS
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flag should have been set on the DWARF producer instance.
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.Pp
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Argument
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.Ar elf_section_index
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should point to a location which will be set to the ELF section index
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of the relocation section to which the retrieved relocation array
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belongs.
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.Pp
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Argument
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.Ar elf_section_link
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should point to a location which will be set to the section index of
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the ELF section to which the retrieved relocation array applies.
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.Pp
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Argument
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.Ar reloc_entry_count
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should point to a location which will be set to the total number of
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relocation entries contained in the relocation array.
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.Pp
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Argument
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.Ar reloc_buf
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should point to a location which will be set to a pointer to the
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retrieved array of relocation entries.
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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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The retrieved relocation entries are described using structure
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.Vt Dwarf_Relocation_Data_s ,
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defined in the header file
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.In libdwarf.h :
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.Bd -literal -offset indent
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typedef struct Dwarf_Relocation_Data_s {
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unsigned char drd_type;
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unsigned char drd_length;
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Dwarf_Unsigned drd_offset;
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Dwarf_Unsigned drd_symbol_index;
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} *Dwarf_Relocation_Data;
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.Ed
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.Pp
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Struct
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.Vt Dwarf_Relocation_Data_s
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consists of following fields:
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.Bl -tag -width ".Va drd_symbol_index" -compact -offset indent
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.It Va drd_type
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The type code of the relocation entry.
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The
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.Vt Dwarf_Rel_Type
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enumeration defined in the header file
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.In libdwarf.h
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specifies legal values for this field.
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.It Va drd_length
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The size in bytes of the field to be relocated.
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.It Va drd_offset
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The section-relative offset of the field to be relocated.
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.It Va drd_symbol_index
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The symbol index associated with the relocation entry.
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.El
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.Ss Memory Management
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The memory area used for the relocation arrays is managed by the
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.Lb libdwarf .
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The function
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.Fn dwarf_producer_finish
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may be used to release it, along with other resources associated
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with the producer instance.
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.Sh RETURN VALUES
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On success, function
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.Fn dwarf_get_relocation_info
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returns
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.Dv DW_DLV_OK .
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It returns
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.Dv DW_DLV_NO_ENTRY
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if there were no more relocation arrays to retrieve, or if the flag
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.Dv DW_DLC_SYMBOLIC_RELOCATIONS
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was not set on the producer instance.
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In case of an error, function
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.Fn dwarf_get_relocation_info
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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 generate relocation entries and retrieve them, use:
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.Bd -literal -offset indent
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Dwarf_P_Debug dbg;
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Dwarf_Relocation_Data buf;
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Dwarf_Signed count, index, link;
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Dwarf_Unsigned reloc_cnt, entry_cnt;
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Dwarf_Error de;
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int version, i, j;
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/*
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* Assume that dbg refers to a DWARF producer instance created
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* created with DW_DLC_SYMBOLIC_RELOCATIONS flag set and that
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* application code has added DWARF debugging information
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* to the producer instance.
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*/
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if ((count = dwarf_transform_to_disk_form(dbg, &de)) ==
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DW_DLV_NOCOUNT) {
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warnx("dwarf_transform_to_disk_form failed: %s",
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dwarf_errmsg(-1));
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return;
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}
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/* ... process generated section byte streams ... */
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if (dwarf_get_relocation_info_count(dbg, &reloc_cnt, &version, &de) !=
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DW_DLV_OK) {
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warnx("dwarf_get_relocation_info_count failed: %s",
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dwarf_errmsg(-1));
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return;
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}
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for (i = 0; (Dwarf_Unsigned) i < reloc_cnt; i++) {
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if (dwarf_get_relocation_info(dbg, &index, &link, &entry_cnt,
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&buf, &de) != DW_DLV_OK) {
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warnx("dwarf_get_relocation_info failed: %s",
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dwarf_errmsg(-1));
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continue;
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}
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for (j = 0; (Dwarf_Unsigned) j < entry_cnt; j++) {
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/* ...use each reloc data in buf[j]... */
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}
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}
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dwarf_producer_finish(dbg, &de);
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.Ed
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.Sh ERRORS
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Function
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.Fn dwarf_get_relocation_info
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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 elf_section_index ,
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.Ar elf_section_link ,
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.Ar reloc_entry_count
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or
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.Ar reloc_buf
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was NULL.
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.It Bq Er DW_DLE_NO_ENTRY
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There were no more ELF relocation arrays to retrieve.
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.It Bq Er DW_DLE_NO_ENTRY
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The flag
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.Dv DW_DLC_SYMBOLIC_RELOCATIONS
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was not set on the producer instance.
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.It Bq Er DW_DLE_NO_ENTRY
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Function
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.Xr dwarf_transform_to_disk_form 3
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was not called prior to calling function
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.Fn dwarf_get_relocation_info .
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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_relocation_info_count 3 ,
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.Xr dwarf_producer_finish 3 ,
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.Xr dwarf_producer_init 3 ,
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.Xr dwarf_producer_init_b 3 ,
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.Xr dwarf_reset_section_bytes 3 ,
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.Xr dwarf_transform_to_disk_form 3
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