forked from Imagelibrary/rtems
19131e9744
* rtems/new-exceptions/cpu.h: Per PR211 fix saving/restoring floating point context. The fpsave and fprestore routines are only used in a executing context which _is_ fp and hence has the FPU enabled. The current behavior required the FPU always to be on which is very dangerous if lazy context switching is used. [Joel Note: Some ports explicitly enabled the FPU in the FP save and restore routines to avoid this.] The patch also makes sure (on powerpc only) that the FPU is disabled for integer tasks. Note that this is crucial if deferred fp context switching is used. Otherwise, fp context corruption may go undetected! Also note that even tasks which merely push/pop FP registers to/from the stack without modifying them still MUST be FP tasks - otherwise (if lazy FP context switching is used), FP register corruption (of other, FP, tasks may occur)! Furthermore, (on PPC) by default, lazy FP context save/restore is _disabled_.
#
# $Id$
#
This is the top level directory of the C RTEMS environment. The
following is a description of the contents of each file and
subdirectory directly in this directory:
tests
This directory contains the RTEMS Test Suites. Currently
this includes the following suites:
+ Single Processor Test Suite
+ Multiprocessor Test Suite
+ Timing Test Suite
+ Sample Application Suite
lib
This directory contains src for RTEMS libraries:
libc, board support (including drivers) and libcpu.
exec
This directory contains the source code for the RTEMS executive.