diff --git a/target/nios2/cpu.h b/target/nios2/cpu.h
index 67ca62fc1f..11e9ed0063 100644
--- a/target/nios2/cpu.h
+++ b/target/nios2/cpu.h
@@ -115,14 +115,21 @@ FIELD(CR_PTEADDR, VPN, 2, 20)
 FIELD(CR_PTEADDR, PTBASE, 22, 10)
 
 #define CR_TLBACC        9
-#define   CR_TLBACC_IGN_SHIFT 25
-#define   CR_TLBACC_IGN_MASK  (0x7F << CR_TLBACC_IGN_SHIFT)
-#define   CR_TLBACC_C         (1 << 24)
-#define   CR_TLBACC_R         (1 << 23)
-#define   CR_TLBACC_W         (1 << 22)
-#define   CR_TLBACC_X         (1 << 21)
-#define   CR_TLBACC_G         (1 << 20)
-#define   CR_TLBACC_PFN_MASK  0x000FFFFF
+
+FIELD(CR_TLBACC, PFN, 0, 20)
+FIELD(CR_TLBACC, G, 20, 1)
+FIELD(CR_TLBACC, X, 21, 1)
+FIELD(CR_TLBACC, W, 22, 1)
+FIELD(CR_TLBACC, R, 23, 1)
+FIELD(CR_TLBACC, C, 24, 1)
+FIELD(CR_TLBACC, IG, 25, 7)
+
+#define CR_TLBACC_C      R_CR_TLBACC_C_MASK
+#define CR_TLBACC_R      R_CR_TLBACC_R_MASK
+#define CR_TLBACC_W      R_CR_TLBACC_W_MASK
+#define CR_TLBACC_X      R_CR_TLBACC_X_MASK
+#define CR_TLBACC_G      R_CR_TLBACC_G_MASK
+
 #define CR_TLBMISC       10
 #define   CR_TLBMISC_WAY_SHIFT 20
 #define   CR_TLBMISC_WAY_MASK  (0xF << CR_TLBMISC_WAY_SHIFT)
diff --git a/target/nios2/mmu.c b/target/nios2/mmu.c
index 75afc56daf..826cd2afb4 100644
--- a/target/nios2/mmu.c
+++ b/target/nios2/mmu.c
@@ -49,7 +49,7 @@ unsigned int mmu_translate(CPUNios2State *env,
         }
 
         lu->vaddr = vaddr & TARGET_PAGE_MASK;
-        lu->paddr = (entry->data & CR_TLBACC_PFN_MASK) << TARGET_PAGE_BITS;
+        lu->paddr = FIELD_EX32(entry->data, CR_TLBACC, PFN) << TARGET_PAGE_BITS;
         lu->prot = ((entry->data & CR_TLBACC_R) ? PAGE_READ : 0) |
                    ((entry->data & CR_TLBACC_W) ? PAGE_WRITE : 0) |
                    ((entry->data & CR_TLBACC_X) ? PAGE_EXEC : 0);
@@ -86,27 +86,27 @@ void helper_mmu_write_tlbacc(CPUNios2State *env, uint32_t v)
     CPUState *cs = env_cpu(env);
     Nios2CPU *cpu = env_archcpu(env);
 
-    trace_nios2_mmu_write_tlbacc(v >> CR_TLBACC_IGN_SHIFT,
+    trace_nios2_mmu_write_tlbacc(FIELD_EX32(v, CR_TLBACC, IG),
                                  (v & CR_TLBACC_C) ? 'C' : '.',
                                  (v & CR_TLBACC_R) ? 'R' : '.',
                                  (v & CR_TLBACC_W) ? 'W' : '.',
                                  (v & CR_TLBACC_X) ? 'X' : '.',
                                  (v & CR_TLBACC_G) ? 'G' : '.',
-                                 v & CR_TLBACC_PFN_MASK);
+                                 FIELD_EX32(v, CR_TLBACC, PFN));
 
     /* if tlbmisc.WE == 1 then trigger a TLB write on writes to TLBACC */
     if (env->ctrl[CR_TLBMISC] & CR_TLBMISC_WR) {
         int way = (env->ctrl[CR_TLBMISC] >> CR_TLBMISC_WAY_SHIFT);
         int vpn = FIELD_EX32(env->mmu.pteaddr_wr, CR_PTEADDR, VPN);
         int pid = (env->mmu.tlbmisc_wr & CR_TLBMISC_PID_MASK) >> 4;
-        int g = (v & CR_TLBACC_G) ? 1 : 0;
-        int valid = ((vpn & CR_TLBACC_PFN_MASK) < 0xC0000) ? 1 : 0;
+        int g = FIELD_EX32(v, CR_TLBACC, G);
+        int valid = FIELD_EX32(vpn, CR_TLBACC, PFN) < 0xC0000;
         Nios2TLBEntry *entry =
             &env->mmu.tlb[(way * cpu->tlb_num_ways) +
                           (vpn & env->mmu.tlb_entry_mask)];
         uint32_t newTag = (vpn << 12) | (g << 11) | (valid << 10) | pid;
         uint32_t newData = v & (CR_TLBACC_C | CR_TLBACC_R | CR_TLBACC_W |
-                                CR_TLBACC_X | CR_TLBACC_PFN_MASK);
+                                CR_TLBACC_X | R_CR_TLBACC_PFN_MASK);
 
         if ((entry->tag != newTag) || (entry->data != newData)) {
             if (entry->tag & (1 << 10)) {
@@ -153,7 +153,7 @@ void helper_mmu_write_tlbmisc(CPUNios2State *env, uint32_t v)
             &env->mmu.tlb[(way * cpu->tlb_num_ways) +
                           (vpn & env->mmu.tlb_entry_mask)];
 
-        env->ctrl[CR_TLBACC] &= CR_TLBACC_IGN_MASK;
+        env->ctrl[CR_TLBACC] &= R_CR_TLBACC_IG_MASK;
         env->ctrl[CR_TLBACC] |= entry->data;
         env->ctrl[CR_TLBACC] |= (entry->tag & (1 << 11)) ? CR_TLBACC_G : 0;
         env->ctrl[CR_TLBMISC] =
@@ -208,7 +208,7 @@ void dump_mmu(CPUNios2State *env)
                     entry->tag >> 12,
                     entry->tag & ((1 << cpu->pid_num_bits) - 1),
                     (entry->tag & (1 << 11)) ? 'G' : '-',
-                    entry->data & CR_TLBACC_PFN_MASK,
+                    FIELD_EX32(entry->data, CR_TLBACC, PFN),
                     (entry->data & CR_TLBACC_C) ? 'C' : '-',
                     (entry->data & CR_TLBACC_R) ? 'R' : '-',
                     (entry->data & CR_TLBACC_W) ? 'W' : '-',
