Signal Stacks

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Follow is my first step in getting signal stacks into the kernel. It is for i386 for initial testing. The patch is from a clean 2.1.15 tree and follows is a C program to play with. Notice this includes the sigaltstack() system call so its not in libc so you need to call it directly like in sig-test.c

I am going to play with mapping the sig stack as GROWS_DOWN but I'm not sure what the expected semantics should be in this case. Any suggestions are appreciated.

Please test and give me reports so I can forward it to Linus.