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* src/threaddispatch.c, src/threadhandler.c: 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_.
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* src/threadhandler.c: When __USE__MAIN__ is defined by the toolset,
invoke the global constructors via __main. Reported as tested by
Alexandra Kossovsky <sasha@oktet.ru> and Victor V. Vengerov
<vvv@oktet.ru> in conjunction with a new set of tool RPMs
(gcc2.95.3newlib1.9.0-3). This was tracked as GNATS PR tools/84.
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* src/threadhandler.c: Use __USE_INIT_FINI__ since USE_INIT_FINI
pollutes the application namespace.
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* src/threadhandler.c: Now process C++ global constructors
(_init) as part of the first task execution not in BSP space.
This depends on the toolset defining USE_INIT_FINI so you
have to have the right toolset version.
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support for return codes from POSIX threads that do an implicit exit
by returning from the bottom of the main function.
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split into one function per file, this will decrease the size of executables.
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