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This patch makes use of the support for several stack pointers introduced by the previous patch to switch between them as needed during unwinding. It introduces a new 'unwind-secure-frames' arm command to enable/disable mode switching during unwinding. It is enabled by default. It has been tested using an STM32L5 board (with cortex-m33) and the sample applications shipped with the STM32Cube development environment: GTZC_TZSC_MPCBB_TrustZone in STM32CubeL5/Projects/NUCLEO-L552ZE-Q/Examples/GTZC. The test consisted in setting breakpoints in various places and check that the backtrace is correct: SecureFault_Callback (Non-secure mode), __gnu_cmse_nonsecure_call (before and after the vpush instruction), SecureFault_Handler (Secure mode). This implies that we tested only some parts of this patch (only MSP* were used), but remaining parts seem reasonable. Signed-off-by: Torbjörn Svensson <torbjorn.svensson@st.com> Signed-off-by: Christophe Lyon <christophe.lyon@foss.st.com> Signed-off-by: Christophe Lyon <christophe.lyon@arm.com>
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.