binutils-gdb/ld
Sudakshina Das cd702818c6 [BFD, LD, AArch64, 1/3] Add support for GNU PROPERTIES in AArch64 for BTI and PAC
This is part of the patch series to add support for BTI and
PAC in AArch64 linker.

This patch implements the following:
1) This extends in the gnu property support in the linker for
AArch64 by defining backend hooks for elf_backend_setup_gnu_properties,
elf_backend_merge_gnu_properties and elf_backend_parse_gnu_properties.
2) It defines AArch64 specific GNU property
GNU_PROPERTY_AARCH64_FEATURE_1_AND and 2 bit for BTI and PAC in it.
3) It also adds support in readelf.c to read and print these new
GNU properties in AArch64.
All these are made according to the new AArch64 ELF ABI
https://developer.arm.com/docs/ihi0056/latest/elf-for-the-arm-64-bit-architecture-aarch64-abi-2018q4

*** bfd/ChangeLog ***

2019-03-13  Sudakshina Das  <sudi.das@arm.com>

	* elf-properties.c (_bfd_elf_link_setup_gnu_properties): Exclude
	linker created inputs from merge.
	* elfnn-aarch64.c (struct elf_aarch64_obj_tdata): Add field for
	GNU_PROPERTY_AARCH64_FEATURE_1_AND properties.
	(elfNN_aarch64_link_setup_gnu_properties): New.
	(elfNN_aarch64_merge_gnu_properties): New.
	(elf_backend_setup_gnu_properties): Define for AArch64.
	(elf_backend_merge_gnu_properties): Likewise.
	* elfxx-aarch64.c (_bfd_aarch64_elf_link_setup_gnu_properties): Define.
	(_bfd_aarch64_elf_parse_gnu_properties): Define.
	(_bfd_aarch64_elf_merge_gnu_properties): Define.
	* elfxx-aarch64.h (_bfd_aarch64_elf_link_setup_gnu_properties): Declare.
	(_bfd_aarch64_elf_parse_gnu_properties): Declare.
	(_bfd_aarch64_elf_merge_gnu_properties): Declare.
	(elf_backend_parse_gnu_properties): Define for AArch64.

*** binutils/ChangeLog ***

2019-03-13  Sudakshina Das  <sudi.das@arm.com>

	* readelf.c (decode_aarch64_feature_1_and): New.
	(print_gnu_property_note): Add case for AArch64 gnu notes.

*** include/ChangeLog ***

2019-03-13  Sudakshina Das  <sudi.das@arm.com>

	* elf/common.h (GNU_PROPERTY_AARCH64_FEATURE_1_AND): New.
	(GNU_PROPERTY_AARCH64_FEATURE_1_BTI): New.
	(GNU_PROPERTY_AARCH64_FEATURE_1_PAC): New.

*** ld/ChangeLog ***

2019-03-13  Sudakshina Das  <sudi.das@arm.com>

	* NEWS: Document GNU_PROPERTY_AARCH64_FEATURE_1_BTI and
	GNU_PROPERTY_AARCH64_FEATURE_1_PAC.
	* testsuite/ld-aarch64/aarch64-elf.exp: Add run commands for new tests.
	* testsuite/ld-aarch64/property-bti-pac1.d: New test.
	* testsuite/ld-aarch64/property-bti-pac1.s: New test.
	* testsuite/ld-aarch64/property-bti-pac2.d: New test.
	* testsuite/ld-aarch64/property-bti-pac2.s: New test.
	* testsuite/ld-aarch64/property-bti-pac3.d: New test.
2019-03-13 11:47:00 +00:00
..
emulparams Revert "Add support to GNU ld to separate got related plt entries" 2019-03-01 15:35:00 +01:00
emultempl [ARC] don't force _init/_fini as DT_INIT/DT_FINI. 2019-02-09 11:07:42 +01:00
po Updated French translation for ld/ and gold/ subdirectories 2019-02-12 13:22:42 +00:00
scripttempl Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
testsuite [BFD, LD, AArch64, 1/3] Add support for GNU PROPERTIES in AArch64 for BTI and PAC 2019-03-13 11:47:00 +00:00
.gitignore
aclocal.m4
ChangeLog [BFD, LD, AArch64, 1/3] Add support for GNU PROPERTIES in AArch64 for BTI and PAC 2019-03-13 11:47:00 +00:00
ChangeLog-0001
ChangeLog-0203
ChangeLog-2004
ChangeLog-2005
ChangeLog-2006
ChangeLog-2007
ChangeLog-2008
ChangeLog-2009
ChangeLog-2010
ChangeLog-2011
ChangeLog-2012
ChangeLog-2013
ChangeLog-2014
ChangeLog-2015
ChangeLog-2016
ChangeLog-2017
ChangeLog-2018 ChangeLog rotation 2019-01-01 21:25:40 +10:30
ChangeLog-9197
ChangeLog-9899
config.in
configure Change version to 2.32.51 and regenerate configure and pot files. 2019-01-19 16:51:42 +00:00
configure.ac Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
configure.host Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
configure.tgt Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
deffile.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
deffilep.y Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
dep-in.sed
elf-hints-local.h
fdl.texi
gen-doc.texi Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
genscrba.sh
genscripts.sh Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
h8-doc.texi Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
ld.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
ld.texi Fix typo in description of --start-group/--end-group options. 2019-02-07 14:54:58 +00:00
ldbuildid.c Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
ldbuildid.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
ldcref.c Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
ldctor.c Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
ldctor.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
ldemul.c Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
ldemul.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
ldexp.c Allow the use of the ORIGIN and LENGTH attributes in expressions inside MEMORY regions. 2019-03-06 15:20:29 +00:00
ldexp.h PR24008, Wrong value of ternary expression in map file 2019-01-28 09:59:29 +10:30
ldfile.c Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
ldfile.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
ldgram.y Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
ldint.texi Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
ldlang.c PR24008, Wrong value of ternary expression in map file 2019-01-28 09:59:29 +10:30
ldlang.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
ldlex-wrapper.c Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
ldlex.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
ldlex.l Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
ldmain.c Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
ldmain.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
ldmisc.c Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
ldmisc.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
ldver.c Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
ldver.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
ldwrite.c Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
ldwrite.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
lexsup.c Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
MAINTAINERS Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
Makefile.am Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
Makefile.in Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
mri.c Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
mri.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
NEWS [BFD, LD, AArch64, 1/3] Add support for GNU PROPERTIES in AArch64 for BTI and PAC 2019-03-13 11:47:00 +00:00
pe-dll.c Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
pe-dll.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
pep-dll.c Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
pep-dll.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
plugin.c Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
plugin.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
README Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
stamp-h.in
sysdep.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
testplug2.c Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
testplug3.c Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
testplug4.c Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
testplug.c Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
TODO

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		README for LD

This is the GNU linker.  It is distributed with other "binary
utilities" which should be in ../binutils.  See ../binutils/README for
more general notes, including where to send bug reports.

There are many features of the linker:

* The linker uses a Binary File Descriptor library (../bfd)
  that it uses to read and write object files.  This helps
  insulate the linker itself from the format of object files.

* The linker supports a number of different object file
  formats.  It can even handle multiple formats at once:
  Read two input formats and write a third.

* The linker can be configured for cross-linking.

* The linker supports a control language.

* There is a user manual (ld.texi), as well as the
  beginnings of an internals manual (ldint.texi).

Installation
============

See ../binutils/README.

If you want to make a cross-linker, you may want to specify
a different search path of -lfoo libraries than the default.
You can do this by setting the LIB_PATH variable in ./Makefile
or using the --with-lib-path configure switch.

To build just the linker, make the target all-ld from the top level
directory (one directory above this one).

Porting to a new target
=======================

See the ldint.texi manual.

Reporting bugs etc
===========================

See ../binutils/README.

Known problems
==============

The Solaris linker normally exports all dynamic symbols from an
executable.  The GNU linker does not do this by default.  This is
because the GNU linker tries to present the same interface for all
similar targets (in this case, all native ELF targets).  This does not
matter for normal programs, but it can make a difference for programs
which try to dlopen an executable, such as PERL or Tcl.  You can make
the GNU linker export all dynamic symbols with the -E or
--export-dynamic command line option.

HP/UX 9.01 has a shell bug that causes the linker scripts to be
generated incorrectly.  The symptom of this appears to be "fatal error
- scanner input buffer overflow" error messages.  There are various
workarounds to this:
  * Build and install bash, and build with "make SHELL=bash".
  * Update to a version of HP/UX with a working shell (e.g., 9.05).
  * Replace "(. ${srcdir}/scripttempl/${SCRIPT_NAME}.sc)" in
    genscripts.sh with "sh ${srcdir}..." (no parens) and make sure the
    emulparams script used exports any shell variables it sets.

Copyright (C) 2012-2019 Free Software Foundation, Inc.

Copying and distribution of this file, with or without modification,
are permitted in any medium without royalty provided the copyright
notice and this notice are preserved.