diff --git a/target-mips/op_helper_mem.c b/target-mips/op_helper_mem.c
index e8ec22b15a56062738b84433330c9d227a0d58c2..6af78ce057c9e9947020910924ef1329c8314bbb 100644
--- a/target-mips/op_helper_mem.c
+++ b/target-mips/op_helper_mem.c
@@ -1,3 +1,5 @@
+#undef DEBUG_OP
+
 #ifdef TARGET_WORDS_BIGENDIAN
 #define GET_LMASK(v) ((v) & 3)
 #else
@@ -12,21 +14,21 @@ void glue(do_lwl, MEMSUFFIX) (uint32_t tmp)
 
     switch (GET_LMASK(T0)) {
     case 0:
-        T0 = tmp;
+        T0 = (int32_t)tmp;
         break;
     case 1:
-        T0 = (tmp << 8) | (T1 & 0x000000FF);
+        T0 = (int32_t)((tmp << 8) | (T1 & 0x000000FF));
         break;
     case 2:
-        T0 = (tmp << 16) | (T1 & 0x0000FFFF);
+        T0 = (int32_t)((tmp << 16) | (T1 & 0x0000FFFF));
         break;
     case 3:
-        T0 = (tmp << 24) | (T1 & 0x00FFFFFF);
+        T0 = (int32_t)((tmp << 24) | (T1 & 0x00FFFFFF));
         break;
     }
 #if defined (DEBUG_OP)
     if (logfile) {
-        fprintf(logfile, "%s: %08x - %08x %08x => %08x\n",
+        fprintf(logfile, "%s: " TLSZ " - %08x " TLSZ " => " TLSZ "\n",
                 __func__, sav, tmp, T1, T0);
     }
 #endif
@@ -41,21 +43,21 @@ void glue(do_lwr, MEMSUFFIX) (uint32_t tmp)
 
     switch (GET_LMASK(T0)) {
     case 0:
-        T0 = (tmp >> 24) | (T1 & 0xFFFFFF00);
+        T0 = (int32_t)((tmp >> 24) | (T1 & 0xFFFFFF00));
         break;
     case 1:
-        T0 = (tmp >> 16) | (T1 & 0xFFFF0000);
+        T0 = (int32_t)((tmp >> 16) | (T1 & 0xFFFF0000));
         break;
     case 2:
-        T0 = (tmp >> 8) | (T1 & 0xFF000000);
+        T0 = (int32_t)((tmp >> 8) | (T1 & 0xFF000000));
         break;
     case 3:
-        T0 = tmp;
+        T0 = (int32_t)tmp;
         break;
     }
 #if defined (DEBUG_OP)
     if (logfile) {
-        fprintf(logfile, "%s: %08x - %08x %08x => %08x\n",
+        fprintf(logfile, "%s: " TLSZ " - %08x " TLSZ " => " TLSZ "\n",
                 __func__, sav, tmp, T1, T0);
     }
 #endif
@@ -70,21 +72,21 @@ uint32_t glue(do_swl, MEMSUFFIX) (uint32_t tmp)
 
     switch (GET_LMASK(T0)) {
     case 0:
-        tmp = T1;
+        tmp = (int32_t)T1;
         break;
     case 1:
-        tmp = (tmp & 0xFF000000) | (T1 >> 8);
+        tmp = (int32_t)((tmp & 0xFF000000) | ((uint32_t)T1 >> 8));
         break;
     case 2:
-        tmp = (tmp & 0xFFFF0000) | (T1 >> 16);
+        tmp = (int32_t)((tmp & 0xFFFF0000) | ((uint32_t)T1 >> 16));
         break;
     case 3:
-        tmp = (tmp & 0xFFFFFF00) | (T1 >> 24);
+        tmp = (int32_t)((tmp & 0xFFFFFF00) | ((uint32_t)T1 >> 24));
         break;
     }
 #if defined (DEBUG_OP)
     if (logfile) {
-        fprintf(logfile, "%s: %08x - %08x %08x => %08x\n",
+        fprintf(logfile, "%s: " TLSZ " - " TLSZ " " TLSZ " => %08x\n",
                 __func__, T0, sav, T1, tmp);
     }
 #endif
@@ -100,21 +102,21 @@ uint32_t glue(do_swr, MEMSUFFIX) (uint32_t tmp)
 
     switch (GET_LMASK(T0)) {
     case 0:
-        tmp = (tmp & 0x00FFFFFF) | (T1 << 24);
+        tmp = (int32_t)((tmp & 0x00FFFFFF) | (T1 << 24));
         break;
     case 1:
-        tmp = (tmp & 0x0000FFFF) | (T1 << 16);
+        tmp = (int32_t)((tmp & 0x0000FFFF) | (T1 << 16));
         break;
     case 2:
-        tmp = (tmp & 0x000000FF) | (T1 << 8);
+        tmp = (int32_t)((tmp & 0x000000FF) | (T1 << 8));
         break;
     case 3:
-        tmp = T1;
+        tmp = (int32_t)T1;
         break;
     }
 #if defined (DEBUG_OP)
     if (logfile) {
-        fprintf(logfile, "%s: %08x - %08x %08x => %08x\n",
+        fprintf(logfile, "%s: " TLSZ " - " TLSZ " " TLSZ " => %08x\n",
                 __func__, T0, sav, T1, tmp);
     }
 #endif
@@ -164,7 +166,7 @@ void glue(do_ldl, MEMSUFFIX) (uint64_t tmp)
     }
 #if defined (DEBUG_OP)
     if (logfile) {
-        fprintf(logfile, "%s: %08x - %08x %08x => %08x\n",
+        fprintf(logfile, "%s: " TLSZ " - " TLSZ " " TLSZ " => " TLSZ "\n",
                 __func__, sav, tmp, T1, T0);
     }
 #endif
@@ -205,7 +207,7 @@ void glue(do_ldr, MEMSUFFIX) (uint64_t tmp)
     }
 #if defined (DEBUG_OP)
     if (logfile) {
-        fprintf(logfile, "%s: %08x - %08x %08x => %08x\n",
+        fprintf(logfile, "%s: " TLSZ " - " TLSZ " " TLSZ " => " TLSZ "\n",
                 __func__, sav, tmp, T1, T0);
     }
 #endif
@@ -246,7 +248,7 @@ uint64_t glue(do_sdl, MEMSUFFIX) (uint64_t tmp)
     }
 #if defined (DEBUG_OP)
     if (logfile) {
-        fprintf(logfile, "%s: %08x - %08x %08x => %08x\n",
+        fprintf(logfile, "%s: " TLSZ " - " TLSZ " " TLSZ " => " TLSZ "\n",
                 __func__, T0, sav, T1, tmp);
     }
 #endif
@@ -288,7 +290,7 @@ uint64_t glue(do_sdr, MEMSUFFIX) (uint64_t tmp)
     }
 #if defined (DEBUG_OP)
     if (logfile) {
-        fprintf(logfile, "%s: %08x - %08x %08x => %08x\n",
+        fprintf(logfile, "%s: " TLSZ " - " TLSZ " " TLSZ " => " TLSZ "\n",
                 __func__, T0, sav, T1, tmp);
     }
 #endif