Patch: Fix signal handlers under indirect-dispatch on MIPS

[David Daney]

For some (as yet unknown) reason on MIPS with -findirect-dispatch, the 
SIGSEGV and SIGFPE signal handlers were not being installed properly. 
This caused the failure of any test case that triggered an 
ArithmeticException or NullPointerException via the signal handling 
mechanism.

The fix is to call libc's sigaction function instead of trying to trick 
libc by doing a direct system call to the kernel.  Since the MIPS port 
does not need to patch-up and restart any faulting divide instructions, 
the syscall trick is not needed.  This has the added benefit of slightly 
simplifying the code.

I guess it is not nice to trick glibc...

These are the test cases that this patch fixes:
Array_3
Divide_1
Invoke_1
StackTrace2
Throw_2
pr83

Regression tested on mipsel-linux with no new failures.

OK to commit?

2006-07-19  David Daney  <ddaney@avtrex.com)

	* include/mips-signal.h: Update copyright.
	(struct kernel_sigaction): Removed.
	(SIGNAL_HANDLER): Changed prototype.
	(MAKE_THROW_FRAME): Added cast.
	(INIT_SEGV): Use sigaction instead of syscall.
	(INIT_FPE): Likewise.
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