what is __eabi in main()

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brendan@dgs.monash.edu.au (Brendan Simon) writes:

> I have built a powerpc cross compiler with eabi.  I notice that main
> calls __eabi.  It apparently sets up the eabi environment (what ever
> that means).  I have seen some startup code stub the __eabi so that it
> returns straight away.  Is this safe ?  How important is the eabi
> environment ?

Look in gcc/config/rs6000/eabi.asm.  It is the general purpose hook to
initialize things.  Currently it:

   1)	Sets up r2 and r13 to hold the 2 small data pointers (ie, support for
	the -msdata switch).

   2)	Relocates all pointers used if loaded at a different location than it
	was linked for, providing all modules were compiled with -mrelocatable
	or -mrelocatable-lib.

   3)	Call the C++ constructors.

Obviously in the future, it may be used for other initializations.

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Michael Meissner, Cygnus Solutions (Massachusetts office)
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