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
142 lines
3.9 KiB
Groff
142 lines
3.9 KiB
Groff
.\" Copyright (c) 2006-2008 Joseph Koshy. 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 Joseph Koshy ``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 Joseph Koshy 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: gelf_getphdr.3 3643 2018-10-14 21:09:24Z jkoshy $
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.\"
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.Dd October 21, 2007
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.Dt GELF_GETPHDR 3
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.Os
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.Sh NAME
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.Nm elf32_getphdr ,
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.Nm elf64_getphdr ,
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.Nm gelf_getphdr
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.Nd retrieve an ELF program header table
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.Sh LIBRARY
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.Lb libelf
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.Sh SYNOPSIS
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.In libelf.h
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.Ft "Elf32_Phdr *"
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.Fn elf32_getphdr "Elf *elf"
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.Ft "Elf64_Phdr *"
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.Fn elf64_getphdr "Elf *elf"
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.In gelf.h
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.Ft "GElf_Phdr *"
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.Fn gelf_getphdr "Elf *elf" "int index" "GElf_Phdr *dst"
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.Sh DESCRIPTION
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These functions retrieve and translate ELF program header information
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from an ELF descriptor, if this information exists.
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.Pp
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Functions
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.Fn elf32_getphdr
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and
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.Fn elf64_getphdr
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return a pointer to an array of translated
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.Vt Elf32_Phdr
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and
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.Vt Elf64_Phdr
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descriptors respectively.
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These descriptors are described in
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.Xr elf 5 .
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The number of entries in this array may be determined using the
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.Xr elf_getphnum 3
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function.
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.Pp
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Function
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.Fn gelf_getphdr
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will retrieve the program header table entry at index
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.Ar index
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from ELF descriptor
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.Ar elf .
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The translated program header table entry will be written to the
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address pointed to be argument
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.Ar dst .
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.Pp
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Applications may inform the library of modifications to a program header table entry
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by using the
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.Xr elf_flagphdr 3
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API.
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Applications using the
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.Xr gelf 3
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interface need to use the
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.Xr gelf_update_phdr 3
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API to copy modifications to a program header entry back to the underlying
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ELF descriptor.
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.Sh RETURN VALUES
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The functions a valid pointer if successful, or NULL in case an error
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was encountered.
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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 "[ELF_E_RESOURCE]"
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.It Bq Er ELF_E_ARGUMENT
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Argument
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.Ar elf
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was NULL.
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.It Bq Er ELF_E_ARGUMENT
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Argument
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.Ar elf
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was not a descriptor for an ELF object.
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.It Bq Er ELF_E_ARGUMENT
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Argument
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.Ar dst
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was NULL.
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.It Bq Er ELF_E_ARGUMENT
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Index
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.Ar index
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was out of range.
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.It Bq Er ELF_E_CLASS
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The class of ELF descriptor
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.Ar elf
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did not match the expected class of the function being called.
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.It Bq Er ELF_E_HEADER
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ELF descriptor
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.Ar elf
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did not possess an executable header.
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.It Bq Er ELF_E_HEADER
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ELF descriptor
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.Ar elf
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had a corrupt executable header.
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.It Bq Er ELF_E_RESOURCE
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An out of memory condition was detected.
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.It Bq Er ELF_E_SECTION
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The ELF descriptor in argument
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.Ar elf
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did not adhere to the conventions used for extended numbering.
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.It Bq Er ELF_VERSION
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ELF descriptor
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.Ar elf
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was of an unsupported version.
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.El
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.Sh SEE ALSO
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.Xr elf 3 ,
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.Xr elf32_getehdr 3 ,
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.Xr elf32_newphdr 3 ,
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.Xr elf64_getehdr 3 ,
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.Xr elf64_newphdr 3 ,
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.Xr elf_flagphdr 3 ,
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.Xr elf_getphnum 3 ,
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.Xr gelf 3 ,
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.Xr gelf_getehdr 3 ,
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.Xr gelf_newphdr 3 ,
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.Xr gelf_update_phdr 3 ,
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.Xr elf 5
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