diff --git a/hw/display/sm501.c b/hw/display/sm501.c
index acc692531a..bd3ccfe311 100644
--- a/hw/display/sm501.c
+++ b/hw/display/sm501.c
@@ -727,8 +727,8 @@ static void sm501_2d_operation(SM501State *s)
     int fb_len = get_width(s, crt) * get_height(s, crt) * get_bpp(s, crt);
 
     if (addressing != 0x0) {
-        printf("%s: only XY addressing is supported.\n", __func__);
-        abort();
+        qemu_log_mask(LOG_UNIMP, "sm501: only XY addressing is supported.\n");
+        return;
     }
 
     if (rop_mode == 0) {
@@ -754,8 +754,8 @@ static void sm501_2d_operation(SM501State *s)
 
     if ((s->twoD_source_base & 0x08000000) ||
         (s->twoD_destination_base & 0x08000000)) {
-        printf("%s: only local memory is supported.\n", __func__);
-        abort();
+        qemu_log_mask(LOG_UNIMP, "sm501: only local memory is supported.\n");
+        return;
     }
 
     switch (operation) {
@@ -823,9 +823,9 @@ static void sm501_2d_operation(SM501State *s)
         break;
 
     default:
-        printf("non-implemented SM501 2D operation. %d\n", operation);
-        abort();
-        break;
+        qemu_log_mask(LOG_UNIMP, "sm501: not implemented 2D operation: %d\n",
+                      operation);
+        return;
     }
 
     if (dst_base >= get_fb_addr(s, crt) &&
@@ -892,9 +892,8 @@ static uint64_t sm501_system_config_read(void *opaque, hwaddr addr,
         break;
 
     default:
-        printf("sm501 system config : not implemented register read."
-               " addr=%x\n", (int)addr);
-        abort();
+        qemu_log_mask(LOG_UNIMP, "sm501: not implemented system config"
+                      "register read. addr=%" HWADDR_PRIx "\n", addr);
     }
 
     return ret;
@@ -948,15 +947,15 @@ static void sm501_system_config_write(void *opaque, hwaddr addr,
         break;
     case SM501_ENDIAN_CONTROL:
         if (value & 0x00000001) {
-            printf("sm501 system config : big endian mode not implemented.\n");
-            abort();
+            qemu_log_mask(LOG_UNIMP, "sm501: system config big endian mode not"
+                          " implemented.\n");
         }
         break;
 
     default:
-        printf("sm501 system config : not implemented register write."
-               " addr=%x, val=%x\n", (int)addr, (uint32_t)value);
-        abort();
+        qemu_log_mask(LOG_UNIMP, "sm501: not implemented system config"
+                      "register write. addr=%" HWADDR_PRIx
+                      ", val=%" PRIx64 "\n", addr, value);
     }
 }
 
@@ -1207,9 +1206,8 @@ static uint64_t sm501_disp_ctrl_read(void *opaque, hwaddr addr,
         break;
 
     default:
-        printf("sm501 disp ctrl : not implemented register read."
-               " addr=%x\n", (int)addr);
-        abort();
+        qemu_log_mask(LOG_UNIMP, "sm501: not implemented disp ctrl register "
+                      "read. addr=%" HWADDR_PRIx "\n", addr);
     }
 
     return ret;
@@ -1345,9 +1343,9 @@ static void sm501_disp_ctrl_write(void *opaque, hwaddr addr,
         break;
 
     default:
-        printf("sm501 disp ctrl : not implemented register write."
-               " addr=%x, val=%x\n", (int)addr, (unsigned)value);
-        abort();
+        qemu_log_mask(LOG_UNIMP, "sm501: not implemented disp ctrl register "
+                      "write. addr=%" HWADDR_PRIx
+                      ", val=%" PRIx64 "\n", addr, value);
     }
 }
 
@@ -1433,9 +1431,8 @@ static uint64_t sm501_2d_engine_read(void *opaque, hwaddr addr,
         ret = 0; /* Should return interrupt status */
         break;
     default:
-        printf("sm501 disp ctrl : not implemented register read."
-               " addr=%x\n", (int)addr);
-        abort();
+        qemu_log_mask(LOG_UNIMP, "sm501: not implemented disp ctrl register "
+                      "read. addr=%" HWADDR_PRIx "\n", addr);
     }
 
     return ret;
@@ -1520,9 +1517,9 @@ static void sm501_2d_engine_write(void *opaque, hwaddr addr,
         /* ignored, writing 0 should clear interrupt status */
         break;
     default:
-        printf("sm501 2d engine : not implemented register write."
-               " addr=%x, val=%x\n", (int)addr, (unsigned)value);
-        abort();
+        qemu_log_mask(LOG_UNIMP, "sm501: not implemented 2d engine register "
+                      "write. addr=%" HWADDR_PRIx
+                      ", val=%" PRIx64 "\n", addr, value);
     }
 }
 
@@ -1670,9 +1667,9 @@ static void sm501_update_display(void *opaque)
         draw_line = draw_line32_funcs[dst_depth_index];
         break;
     default:
-        printf("sm501 update display : invalid control register value.\n");
-        abort();
-        break;
+        qemu_log_mask(LOG_GUEST_ERROR, "sm501: update display"
+                      "invalid control register value.\n");
+        return;
     }
 
     /* set up to draw hardware cursor */