[RFA/libgloss/arm] Handle zero heap base from semihosting

[Matthew Gretton-Dann]

Hi,

The attached patch fixes an issue in libgloss' heap setup when using 
semihosting.

In particular the semihosting SYS_HEAPINFO call can return 0 for the 
heap_base, and this means that the C library is to start the heap at the 
end of the image.

This behaviour is documented here:

http://infocenter.arm.com/help/topic/com.arm.doc.dui0471-/Bacbefaa.html

The attached patch handles this case.

Please can someone review.

Thanks,

Matt

libgloss/ChangeLog:

2011-09-02  Matthew Gretton-Dann  <matthew.gretton-dann@arm.com>

         * arm/crt0.s: support 0 heap base response from semihosting.

Thanks,

Matt

-- 
Matthew Gretton-Dann
Principal Engineer, PD Software - Tools, ARM Ltd
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