hw/pl181: Use LOG_UNIMP and LOG_GUEST_ERROR

Rather than a mix of direct printing to stderr and aborting
via hw_error(), use LOG_UNIMP and LOG_GUEST_ERROR.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

hw/pl181.c

diff --git a/hw/pl181.c b/hw/pl181.c
index 7d91fbb..5a73473 100644
--- a/hw/pl181.c
+++ b/hw/pl181.c
@@ -352,7 +352,7 @@
     case 0xa0: case 0xa4: case 0xa8: case 0xac:
     case 0xb0: case 0xb4: case 0xb8: case 0xbc:
         if (s->fifo_len == 0) {
-            fprintf(stderr, "pl181: Unexpected FIFO read\n");
+            qemu_log_mask(LOG_GUEST_ERROR, "pl181: Unexpected FIFO read\n");
             return 0;
         } else {
             uint32_t value;
@@ -363,7 +363,8 @@
             return value;
         }
     default:
-        hw_error("pl181_read: Bad offset %x\n", (int)offset);
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "pl181_read: Bad offset %x\n", (int)offset);
         return 0;
     }
 }
@@ -387,11 +388,11 @@
         s->cmd = value;
         if (s->cmd & PL181_CMD_ENABLE) {
             if (s->cmd & PL181_CMD_INTERRUPT) {
-                fprintf(stderr, "pl181: Interrupt mode not implemented\n");
-                abort();
+                qemu_log_mask(LOG_UNIMP,
+                              "pl181: Interrupt mode not implemented\n");
             } if (s->cmd & PL181_CMD_PENDING) {
-                fprintf(stderr, "pl181: Pending commands not implemented\n");
-                abort();
+                qemu_log_mask(LOG_UNIMP,
+                              "pl181: Pending commands not implemented\n");
             } else {
                 pl181_send_command(s);
                 pl181_fifo_run(s);
@@ -427,14 +428,15 @@
     case 0xa0: case 0xa4: case 0xa8: case 0xac:
     case 0xb0: case 0xb4: case 0xb8: case 0xbc:
         if (s->datacnt == 0) {
-            fprintf(stderr, "pl181: Unexpected FIFO write\n");
+            qemu_log_mask(LOG_GUEST_ERROR, "pl181: Unexpected FIFO write\n");
         } else {
             pl181_fifo_push(s, value);
             pl181_fifo_run(s);
         }
         break;
     default:
-        hw_error("pl181_write: Bad offset %x\n", (int)offset);
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "pl181_write: Bad offset %x\n", (int)offset);
     }
     pl181_update(s);
 }