SPARC: catch unexpected softare traps

Unexpected software traps ("ta" instruction) are now handled by the
fatal exception handler and eventually end up in z_fatal_error().

Signed-off-by: Martin Åberg <[email protected]>

Author: tbr-tt

arch/sparc/core/trap_table_mvt.S

@@ -37,12 +37,19 @@
 	jmp	%g4+%lo(handler); \
 	 nop;
 
-#define SOFT_TRAP \
+/*
+ * Generate the "trap in trap" condition which causes the processor to halt and
+ * enter error mode. Typically used to stop a simulator (QEMU, TSIM) or leave
+ * control to a hardware debug monitor (LEON DSU via GRMON).
+ */
+#define TRAP_IN_TRAP \
 	ta	0x00; \
 	nop; \
 	nop; \
 	nop;
 
+#define SOFT_TRAP BAD_TRAP
+
 #define WOF_TRAP                TRAP(__sparc_trap_window_overflow)
 #define WUF_TRAP                TRAP(__sparc_trap_window_underflow)
 #define FLW_TRAP                BAD_TRAP
@@ -145,7 +152,7 @@ __start:
 
 	/* trap_instruction 0x80 - 0xFF */
 	/* NOTE: "ta 5" can be generated by compiler. */
-	SOFT_TRAP;                                    !  0 System calls
+	TRAP_IN_TRAP;                                 !  0 System calls
 	SOFT_TRAP;                                    !  1 Breakpoints
 	SOFT_TRAP;                                    !  2 Division by zero
 	FLW_TRAP;                                     !  3 Flush windows