Alan Hayward 11e1b75f06 AArch64: DWARF unwinder support for signed return addresses
Pauth address signing is enabled at binary compile time.  When enabled the
return addresses for functions may be mangled.  This patch adds functionality
to restore the original address for use in the DWARF unwinder.

DW_CFA_AARCH64_negate_ra_state in a binary indicates the toggling of address
signing between enabled and disabled.  Ensure the state is stored in the DWARF
register ra_state.

Ensure the pauth DWARF registers are initialised.

gdb/ChangeLog:

	* aarch64-tdep.c (aarch64_frame_unmask_address): New function.
	(aarch64_dwarf2_prev_register): Unmask PC value.
	(aarch64_dwarf2_frame_init_reg): Init pauth registers.
	(aarch64_execute_dwarf_cfa_vendor_op): Check for
	DW_CFA_AARCH64_negate_ra_state.
	(aarch64_gdbarch_init): Add aarch64_execute_dwarf_cfa_vendor_op.
2019-03-22 10:39:11 +00:00
2019-03-22 00:00:37 +00:00
2019-01-31 17:25:06 +00:00

		   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.
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