vDSO preliminary implementation

[Jake Moilanen]

> What this implementation contains however is the signal trampoline beeing moved
> to the vDSO area, thus no longer on the stack, so people working on
> non-executable stacks can toy with it.

Hey I can boot w/ distros that compile w/ pt_gnu_stacks now!

>
> +VDSO32_CFLAGS := -shared -s -fno-common -Iinclude -fno-builtin -nostdlib
> +VDSO32_CFLAGS += -Wl,-soname=linux-vdso32.so.1
> +VDSO32_AFLAGS := -D__ASSEMBLY__ -s

Don't you need -Iinclude on your VDSO32_AFLAGS line?  I had to add it to
compile both sigtramp.S for vdso32 and vdso64.

Thanks,
Jake


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