Go to file
Fangrui Song 90b7a5df15 aarch64: Disallow copy relocations on protected data
If an executable has copy relocations for extern protected data, that
can only work if the shared object containing the definition is built
with assumptions (a) the compiler emits GOT-generating relocations (b)
the linker produces R_*_GLOB_DAT instead of R_*_RELATIVE.  Otherwise the
shared object uses its own definition directly and the executable
accesses a stale copy.  Note: the GOT relocations defeat the purpose of
protected visibility as an optimization, and it turns out this never
worked perfectly.

glibc 2.36 will warn on copy relocations on protected data.  Let's
produce a warning at link time, matching ld.lld which has been used on
many aarch64 OSes.

Note: x86 requires GNU_PROPERTY_NO_COPY_ON_PROTECTED to have the error.
This is to largely due to GCC 5's "x86-64: Optimize access to globals in
PIE with copy reloc" which started to use direct access relocations for
external data symbols in -fpie mode.

GCC's aarch64 port does not have the change.  Nowadays with most builds
switching to -fpie/-fpic, aarch64 mostly doesn't need to worry about
copy relocations.  So for aarch64 we simply don't check
GNU_PROPERTY_NO_COPY_ON_PROTECTED.
2022-06-22 10:55:12 -07:00
bfd aarch64: Disallow copy relocations on protected data 2022-06-22 10:55:12 -07:00
binutils Binutils support for split-dwarf and dwarf-5 2022-06-22 17:07:25 +01:00
config
contrib
cpu
elfcpp
etc
gas RISC-V: Reorder the prefixed extensions which are out of order. 2022-06-22 18:13:50 +08:00
gdb Document how GDB searches for files when using -s, -e, and -se options 2022-06-21 09:47:15 -07:00
gdbserver gdbserver: Add LoongArch/Linux support 2022-06-14 22:21:43 +08:00
gdbsupport
gnulib
gold
gprof
gprofng gprofng: fix build with -Werror=format-truncation 2022-06-16 20:44:24 -07:00
include RISC-V: Use single h extension to control hypervisor CSRs and instructions. 2022-06-22 18:13:37 +08:00
intl
ld aarch64: Disallow copy relocations on protected data 2022-06-22 10:55:12 -07:00
libbacktrace
libctf libctf: tests: prune warnings from compiler output 2022-06-21 19:27:15 +01:00
libdecnumber
libiberty
opcodes RISC-V: Use single h extension to control hypervisor CSRs and instructions. 2022-06-22 18:13:37 +08:00
readline
sim sim: fix BFD_VMA format arguments on 32-bit hosts [PR gdb/29184] 2022-06-15 23:12:56 +01:00
texinfo
zlib
.cvsignore
.editorconfig
.gitattributes
.gitignore
ar-lib
ChangeLog
compile
config-ml.in
config.guess
config.rpath
config.sub
configure
configure.ac
COPYING
COPYING3
COPYING3.LIB
COPYING.LIB
COPYING.LIBGLOSS
COPYING.NEWLIB
depcomp
djunpack.bat
install-sh
libtool.m4
lt~obsolete.m4
ltgcc.m4
ltmain.sh
ltoptions.m4
ltsugar.m4
ltversion.m4
MAINTAINERS
Makefile.def
Makefile.in
Makefile.tpl
makefile.vms
missing
mkdep
mkinstalldirs
move-if-change
multilib.am
README
README-maintainer-mode
setup.com
src-release.sh
symlink-tree
test-driver
ylwrap

		   README for GNU development tools

This directory contains various GNU compilers, assemblers, linkers, 
debuggers, etc., plus their support routines, definitions, and documentation.

If you are receiving this as part of a GDB release, see the file gdb/README.
If with a binutils release, see binutils/README;  if with a libg++ release,
see libg++/README, etc.  That'll give you info about this
package -- supported targets, how to use it, how to report bugs, etc.

It is now possible to automatically configure and build a variety of
tools with one command.  To build all of the tools contained herein,
run the ``configure'' script here, e.g.:

	./configure 
	make

To install them (by default in /usr/local/bin, /usr/local/lib, etc),
then do:
	make install

(If the configure script can't determine your type of computer, give it
the name as an argument, for instance ``./configure sun4''.  You can
use the script ``config.sub'' to test whether a name is recognized; if
it is, config.sub translates it to a triplet specifying CPU, vendor,
and OS.)

If you have more than one compiler on your system, it is often best to
explicitly set CC in the environment before running configure, and to
also set CC when running make.  For example (assuming sh/bash/ksh):

	CC=gcc ./configure
	make

A similar example using csh:

	setenv CC gcc
	./configure
	make

Much of the code and documentation enclosed is copyright by
the Free Software Foundation, Inc.  See the file COPYING or
COPYING.LIB in the various directories, for a description of the
GNU General Public License terms under which you can copy the files.

REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info
on where and how to report problems.