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Read LSPEN, ASPEN and LSPACT bits from FPCCR and use them together with FPCAR to identify if lazy FPU state preservation is active for the current frame. See "Lazy context save of FP state", in B1.5.7, also ARM AN298, supported by Cortex-M4F architecture for details on lazy FPU register stacking. The same conditions are valid for other Cortex-M cores with FPU. This patch has been verified on a STM32F4-Discovery board by: a) writing a non-zero value (lets use 0x1122334455667788 as an example) to all the D-registers in the main function b) configured the SysTick to fire c) in the SysTick_Handler, write some other value (lets use 0x0022446688aaccee as an example) to one of the D-registers (D0 as an example) and then do "SVC #0" d) in the SVC_Handler, write some other value (lets use 0x0099aabbccddeeff) to one of the D-registers (D0 as an example) In GDB, suspend the execution in the SVC_Handler function and compare the value of the D-registers for the SVC_handler frame and the SysTick_Handler frame. With the patch, the value of the modified D-register (D0) should be the new value (0x009..eff) on the SVC_Handler frame, and the intermediate value (0x002..cee) for the SysTick_Handler frame. Now compare the D-register value for the SysTick_Handler frame and the main frame. The main frame should have the initial value (0x112..788). Signed-off-by: Torbjörn SVENSSON <torbjorn.svensson@foss.st.com> Signed-off-by: Yvan ROUX <yvan.roux@foss.st.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.