Replace cpu_abort with hw_error

Signed-off-by: Paul Brook <paul@codesourcery.com>
diff --git a/hw/pl011.c b/hw/pl011.c
index 468d48a..3a4e149 100644
--- a/hw/pl011.c
+++ b/hw/pl011.c
@@ -103,7 +103,7 @@
     case 18: /* UARTDMACR */
         return s->dmacr;
     default:
-        cpu_abort (cpu_single_env, "pl011_read: Bad offset %x\n", (int)offset);
+        hw_error("pl011_read: Bad offset %x\n", (int)offset);
         return 0;
     }
 }
@@ -175,10 +175,10 @@
     case 18: /* UARTDMACR */
         s->dmacr = value;
         if (value & 3)
-            cpu_abort(cpu_single_env, "PL011: DMA not implemented\n");
+            hw_error("PL011: DMA not implemented\n");
         break;
     default:
-        cpu_abort (cpu_single_env, "pl011_write: Bad offset %x\n", (int)offset);
+        hw_error("pl011_write: Bad offset %x\n", (int)offset);
     }
 }