- added exception vector table.

S/W can write exception handler entry to this table.
  Exception handler can now reside anywhere in memory.

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git-svn-id: http://moon:8086/svn/vhdl/trunk@494 cc03376c-175c-47c8-b038-4cd826a8556b

lib/CPUs/MIPS/bsp/examples/kernel.S

@@ -1,9 +1,13 @@
 #include <regdef.h>
 #include <xcpt_asm.h>
 
-		.section .ktext,"ax"
+		.section .exc_vect
+_xcpt_vector_tbl:
+		.fill	16, 4, 0		
+			
+		.text
 
-LEAF(xcptlow_handler)
+LEAF(_xcpt_handler)
 		.set noreorder
 		.set noat
 		/* Note: exceptions do not save and restore registers k0 and k1.
@@ -91,21 +95,21 @@ LEAF(xcptlow_handler)
 		/* and call the C exception handler */
 		move a0, sp	# arg1 = &xcp
 		subu sp, 16	# (arg save area)
-		j _xcptcall
+		j _xcpt_call
 		move ra, zero	# fake return address
 		
-		/* This strange call to _xcptcall with zero return address is to
+		/* This strange call to _xcpt_call with zero return address is to
 		* help exception-aware debuggers to trace back over the exception event.
 		* We are basically interposing a bogus stackframe (with a zero return
 		* address) between the C exception handler and the actual machine
 		* exception.
 		*/
-xcptrest:
+$xcptrest:
 		.set noat
 		add AT, sp, 16
 		
 		/* at points to exception frame */
-xcptrestother:
+$xcptrestother:
 		/* restore all state */
 		/* restore most general registers */
 		lw t0, XCP_T0(AT)
@@ -160,10 +164,10 @@ xcptrestother:
 
 		.set reorder
 		.set at
-END(xcptlow_handler)
+END(_xcpt_handler)
 		
-
-LEAF(_xcptcall)
+		
+LEAF(_xcpt_call)
 		/* on entry: a0 == &xcp */
 		subu sp, 24
 		sw ra, 16(sp)
@@ -173,8 +177,8 @@ LEAF(_xcptcall)
 		nop
 		lw ra, 16(sp)
 		addu sp, 24
-		beqz ra, xcptrest
+		beqz ra, $xcptrest
 		nop
 		j ra
 		nop
-END(_xcptcall)	
+END(_xcpt_call)