Fix the MMU TLB miss handlers so that they no longer crash when build…

…ing SPARC64 with -O0.

This patch allocates an extra 192 bytes of stack space required by unoptimised gcc builds for saving arguments to the stack. As 
suggested by Igor previously (see http://lists.openbios.org/pipermail/openbios/2009-July/003762.html and SVN r508).

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@siriusit.co.uk>


git-svn-id: svn://coreboot.org/openbios/trunk/openbios-devel@887 f158a5a8-5612-0410-a976-696ce0be7e32

arch/sparc64/vectors.S

@@ -557,8 +557,9 @@ reload_DMMU_tlb:
 
 	SAVE_CPU_STATE(dtlb)
 
-	/* Switch to TLB locked stack space */
-	add 	%g1, -STACK_BIAS, %sp
+	/* Switch to TLB locked stack space (note we add an additional 192 bytes required for
+	   gcc to save its arguments when building with -O0) */
+	add 	%g1, -STACK_BIAS - 192, %sp
 
 	/* Enable interrupts for window spill/fill traps */
 	rdpr	%pstate, %g7
@@ -581,8 +582,9 @@ reload_IMMU_tlb:
 
 	SAVE_CPU_STATE(itlb)
 
-	/* Switch to TLB locked stack space */
-	add 	%g1, -STACK_BIAS, %sp
+	/* Switch to TLB locked stack space (note we add an additional 192 bytes required for
+	   gcc to save its arguments when building with -O0) */
+	add 	%g1, -STACK_BIAS - 192, %sp
 
 	/* Enable interrupts for window spill/fill traps */
 	rdpr	%pstate, %g7