target-lm32: fix debug memory access

CPU models which have the LM32_FLAG_IGNORE_MSB flag set will shadow the
lower 2GB to the upper 2GB memory space. This will fix the debug memory
access used by qemu console and GDB to match this behaviour.
Signed-off-by: NMichael Walle <michael@walle.cc>

target-lm32/helper.c

@@ -39,7 +39,12 @@ int cpu_lm32_handle_mmu_fault(CPULM32State *env, target_ulong address, int rw,
 
 hwaddr cpu_get_phys_page_debug(CPULM32State *env, target_ulong addr)
 {
-    return addr & TARGET_PAGE_MASK;
+    addr &= TARGET_PAGE_MASK;
+    if (env->flags & LM32_FLAG_IGNORE_MSB) {
+        return addr & 0x7fffffff;
+    } else {
+        return addr;
+    }
 }
 
 void lm32_cpu_do_interrupt(CPUState *cs)