old-cross-binutils/ld
H.J. Lu f74839702e Add extern_protected_data and set it for x86
Re-apply: commit ca3fe95e46

With copy relocation, address of protected data defined in the shared
library may be external.  This patch adds extern_protected_data and
changes _bfd_elf_symbol_refs_local_p to return false for protected data
if extern_protected_data is true.

This patch will break building shared libraries with protected data
symbols using GCCs older than GCC 5 without the bug fix for

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65248

GCC backport request should be made in the GCC bug report above.

To get correct run-time behavior on Linux, glibc 2.22 or above are
required, which have the bug fix for

https://sourceware.org/bugzilla/show_bug.cgi?id=17711

Backports for glibc 2.21, 2.20, 2.19 and 2.18 are on hjl/pr17711/2.21,
hjl/pr17711/2.20, hjl/pr17711/2.19 and hjl/pr17711/2.18 branches,
respectively, at

https://sourceware.org/git/?p=glibc.git;a=summary

bfd/

	PR ld/pr15228
	PR ld/pr17709
	* elf-bfd.h (elf_backend_data): Add extern_protected_data.
	* elf32-i386.c (elf_backend_extern_protected_data): New.
	Defined to 1.
	* elf64-x86-64.c (elf_backend_extern_protected_data): Likewise.
	* elflink.c (_bfd_elf_adjust_dynamic_copy): Don't error on
	copy relocs against protected symbols if extern_protected_data
	is true.
	(_bfd_elf_symbol_refs_local_p): Don't return true on protected
	non-function symbols if extern_protected_data is true.
	* elfxx-target.h (elf_backend_extern_protected_data): New.
	Default to 0.
	(elfNN_bed): Initialize extern_protected_data with
	elf_backend_extern_protected_data.

ld/testsuite/

	PR ld/pr15228
	PR ld/pr17709
	* ld-i386/i386.exp (i386tests): Add a test for PR ld/17709.
	* ld-i386/pr17709-nacl.rd: New file.
	* ld-i386/pr17709.rd: Likewise.
	* ld-i386/pr17709a.s: Likewise.
	* ld-i386/pr17709b.s: Likewise.
	* ld-i386/protected3.d: Updated.
	* ld-i386/protected3.s: Likewise.
	* ld-x86-64/pr17709-nacl.rd: New file.
	* ld-x86-64/pr17709.rd: Likewise.
	* ld-x86-64/pr17709a.s: Likewise.
	* ld-x86-64/pr17709b.s: Likewise.
	* ld-x86-64/protected3.d: Updated.
	* ld-x86-64/protected3.s: Likewise.
	* ld-x86-64/x86-64.exp (x86_64tests): Add a test for PR ld/17709.
2015-04-10 11:06:34 -07:00
..
emulparams Remove BNDPLT and add PARSE_AND_LIST_ARGS_CASE_Z 2015-04-09 07:53:00 -07:00
emultempl Remove BNDPLT and add PARSE_AND_LIST_ARGS_CASE_Z 2015-04-09 07:53:00 -07:00
po Update French translation of ld strings. 2015-04-09 14:56:29 +01:00
scripttempl Start of relro segment adjustment 2015-04-01 19:37:58 +10:30
testsuite Add extern_protected_data and set it for x86 2015-04-10 11:06:34 -07:00
.gitignore
aclocal.m4
ChangeLog Correct setting of elf_list_options 2015-04-10 18:22:50 +09:30
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 rotatation and copyright year update 2015-01-02 00:53:45 +10:30
ChangeLog-9197
ChangeLog-9899
config.in Remove --with-zlib from ld 2015-03-31 03:59:04 -07:00
configure Correct setting of elf_list_options 2015-04-10 18:22:50 +09:30
configure.ac Correct setting of elf_list_options 2015-04-10 18:22:50 +09:30
configure.host ChangeLog rotatation and copyright year update 2015-01-02 00:53:45 +10:30
configure.tgt Add support for configuring an aarch64-freebsd target. 2015-04-02 15:07:27 +01:00
deffile.h ChangeLog rotatation and copyright year update 2015-01-02 00:53:45 +10:30
deffilep.y ChangeLog rotatation and copyright year update 2015-01-02 00:53:45 +10:30
dep-in.sed
elf-hints-local.h
fdl.texi
gen-doc.texi ChangeLog rotatation and copyright year update 2015-01-02 00:53:45 +10:30
genscrba.sh
genscripts.sh ChangeLog rotatation and copyright year update 2015-01-02 00:53:45 +10:30
h8-doc.texi ChangeLog rotatation and copyright year update 2015-01-02 00:53:45 +10:30
ld.h Add new linker option: --warn-orphan which generates warning messages when orphan sections are detected. 2015-04-07 16:29:41 +01:00
ld.texinfo Add documentation about the interation of the ARM assembler's -EB option and the linker's --be8 option. 2015-04-10 08:26:07 +01:00
ldbuildid.c ChangeLog rotatation and copyright year update 2015-01-02 00:53:45 +10:30
ldbuildid.h ChangeLog rotatation and copyright year update 2015-01-02 00:53:45 +10:30
ldcref.c ChangeLog rotatation and copyright year update 2015-01-02 00:53:45 +10:30
ldctor.c ChangeLog rotatation and copyright year update 2015-01-02 00:53:45 +10:30
ldctor.h ChangeLog rotatation and copyright year update 2015-01-02 00:53:45 +10:30
ldemul.c Add new linker option: --warn-orphan which generates warning messages when orphan sections are detected. 2015-04-07 16:29:41 +01:00
ldemul.h ChangeLog rotatation and copyright year update 2015-01-02 00:53:45 +10:30
ldexp.c Start of relro segment adjustment 2015-04-01 19:37:58 +10:30
ldexp.h ChangeLog rotatation and copyright year update 2015-01-02 00:53:45 +10:30
ldfile.c PR ld/17973 LTO file syms 2015-02-14 23:41:54 +10:30
ldfile.h ChangeLog rotatation and copyright year update 2015-01-02 00:53:45 +10:30
ldgram.y Allow symbols in MEMORY region specification 2015-01-28 15:06:48 +10:30
ldint.texinfo ChangeLog rotatation and copyright year update 2015-01-02 00:53:45 +10:30
ldlang.c Mark _init and _fini for --gc-sections 2015-04-10 10:27:03 +09:30
ldlang.h PR ld/17973 LTO file syms 2015-02-14 23:41:54 +10:30
ldlex-wrapper.c ChangeLog rotatation and copyright year update 2015-01-02 00:53:45 +10:30
ldlex.h Add new linker option: --warn-orphan which generates warning messages when orphan sections are detected. 2015-04-07 16:29:41 +01:00
ldlex.l ChangeLog rotatation and copyright year update 2015-01-02 00:53:45 +10:30
ldmain.c Use %F instead of %X for einfo 2015-03-18 11:45:12 +10:30
ldmain.h ChangeLog rotatation and copyright year update 2015-01-02 00:53:45 +10:30
ldmisc.c ChangeLog rotatation and copyright year update 2015-01-02 00:53:45 +10:30
ldmisc.h ChangeLog rotatation and copyright year update 2015-01-02 00:53:45 +10:30
ldver.c Correct printed year in copyright notices 2015-01-02 01:08:15 +10:30
ldver.h ChangeLog rotatation and copyright year update 2015-01-02 00:53:45 +10:30
ldwrite.c ChangeLog rotatation and copyright year update 2015-01-02 00:53:45 +10:30
ldwrite.h ChangeLog rotatation and copyright year update 2015-01-02 00:53:45 +10:30
lexsup.c Add ld_list_options 2015-04-08 04:55:23 -07:00
MAINTAINERS ChangeLog rotatation and copyright year update 2015-01-02 00:53:45 +10:30
Makefile.am Add ld_list_options 2015-04-08 04:55:23 -07:00
Makefile.in Add ld_list_options 2015-04-08 04:55:23 -07:00
mri.c ChangeLog rotatation and copyright year update 2015-01-02 00:53:45 +10:30
mri.h ChangeLog rotatation and copyright year update 2015-01-02 00:53:45 +10:30
NEWS Add new linker option: --warn-orphan which generates warning messages when orphan sections are detected. 2015-04-07 16:29:41 +01:00
pe-dll.c ChangeLog rotatation and copyright year update 2015-01-02 00:53:45 +10:30
pe-dll.h ChangeLog rotatation and copyright year update 2015-01-02 00:53:45 +10:30
pep-dll.c ChangeLog rotatation and copyright year update 2015-01-02 00:53:45 +10:30
pep-dll.h ChangeLog rotatation and copyright year update 2015-01-02 00:53:45 +10:30
plugin.c PR ld/17973 LTO file syms 2015-02-14 23:41:54 +10:30
plugin.h Update plugin_maybe_claim 2015-02-07 11:01:22 -08:00
README ChangeLog rotatation and copyright year update 2015-01-02 00:53:45 +10:30
stamp-h.in
sysdep.h ChangeLog rotatation and copyright year update 2015-01-02 00:53:45 +10:30
testplug.c The initial support for LDPT_GET_VIEW 2015-01-28 10:27:31 -08:00
testplug2.c Add a testcase for PR ld/17973 2015-02-14 06:26:20 -08:00
testplug3.c Remove unused dump_tv_tag 2015-02-11 13:35:07 -08:00
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.texinfo), as well as the
  beginnings of an internals manual (ldint.texinfo).

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.texinfo 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) 2012-2015 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.