target/ppc: Use MMUAccessType in mmu-hash64.c

We must leave the 'int rwx' parameter to ppc_hash64_handle_mmu_fault
for now, but will clean that up later.

Signed-off-by: Ricgard Henderson <richard.henderson@linaro.org>
Message-Id: <20210518201146.794854-4-richard.henderson@linaro.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

target/ppc/mmu-hash64.c

@@ -877,10 +877,12 @@ int ppc_hash64_handle_mmu_fault(PowerPCCPU *cpu, vaddr eaddr,
     hwaddr ptex;
     ppc_hash_pte64_t pte;
     int exec_prot, pp_prot, amr_prot, prot;
+    MMUAccessType access_type;
     int need_prot;
     hwaddr raddr;
 
     assert((rwx == 0) || (rwx == 1) || (rwx == 2));
+    access_type = rwx;
 
     /*
      * Note on LPCR usage: 970 uses HID4, but our special variant of
@@ -891,7 +893,7 @@ int ppc_hash64_handle_mmu_fault(PowerPCCPU *cpu, vaddr eaddr,
      */
 
     /* 1. Handle real mode accesses */
-    if (((rwx == 2) && (msr_ir == 0)) || ((rwx != 2) && (msr_dr == 0))) {
+    if (access_type == MMU_INST_FETCH ? !msr_ir : !msr_dr) {
         /*
          * Translation is supposedly "off", but in real mode the top 4
          * effective address bits are (mostly) ignored
@@ -924,14 +926,19 @@ int ppc_hash64_handle_mmu_fault(PowerPCCPU *cpu, vaddr eaddr,
 
             /* Emulated old-style RMO mode, bounds check against RMLS */
             if (raddr >= limit) {
-                if (rwx == 2) {
+                switch (access_type) {
+                case MMU_INST_FETCH:
                     ppc_hash64_set_isi(cs, SRR1_PROTFAULT);
-                } else {
-                    int dsisr = DSISR_PROTFAULT;
-                    if (rwx == 1) {
-                        dsisr |= DSISR_ISSTORE;
-                    }
-                    ppc_hash64_set_dsi(cs, eaddr, dsisr);
+                    break;
+                case MMU_DATA_LOAD:
+                    ppc_hash64_set_dsi(cs, eaddr, DSISR_PROTFAULT);
+                    break;
+                case MMU_DATA_STORE:
+                    ppc_hash64_set_dsi(cs, eaddr,
+                                       DSISR_PROTFAULT | DSISR_ISSTORE);
+                    break;
+                default:
+                    g_assert_not_reached();
                 }
                 return 1;
             }
@@ -954,36 +961,46 @@ int ppc_hash64_handle_mmu_fault(PowerPCCPU *cpu, vaddr eaddr,
             exit(1);
         }
         /* Segment still not found, generate the appropriate interrupt */
-        if (rwx == 2) {
+        switch (access_type) {
+        case MMU_INST_FETCH:
             cs->exception_index = POWERPC_EXCP_ISEG;
             env->error_code = 0;
-        } else {
+            break;
+        case MMU_DATA_LOAD:
+        case MMU_DATA_STORE:
             cs->exception_index = POWERPC_EXCP_DSEG;
             env->error_code = 0;
             env->spr[SPR_DAR] = eaddr;
+            break;
+        default:
+            g_assert_not_reached();
         }
         return 1;
     }
 
 skip_slb_search:
 
     /* 3. Check for segment level no-execute violation */
-    if ((rwx == 2) && (slb->vsid & SLB_VSID_N)) {
+    if (access_type == MMU_INST_FETCH && (slb->vsid & SLB_VSID_N)) {
         ppc_hash64_set_isi(cs, SRR1_NOEXEC_GUARD);
         return 1;
     }
 
     /* 4. Locate the PTE in the hash table */
     ptex = ppc_hash64_htab_lookup(cpu, slb, eaddr, &pte, &apshift);
     if (ptex == -1) {
-        if (rwx == 2) {
+        switch (access_type) {
+        case MMU_INST_FETCH:
             ppc_hash64_set_isi(cs, SRR1_NOPTE);
-        } else {
-            int dsisr = DSISR_NOPTE;
-            if (rwx == 1) {
-                dsisr |= DSISR_ISSTORE;
-            }
-            ppc_hash64_set_dsi(cs, eaddr, dsisr);
+            break;
+        case MMU_DATA_LOAD:
+            ppc_hash64_set_dsi(cs, eaddr, DSISR_NOPTE);
+            break;
+        case MMU_DATA_STORE:
+            ppc_hash64_set_dsi(cs, eaddr, DSISR_NOPTE | DSISR_ISSTORE);
+            break;
+        default:
+            g_assert_not_reached();
         }
         return 1;
     }
@@ -997,11 +1014,11 @@ int ppc_hash64_handle_mmu_fault(PowerPCCPU *cpu, vaddr eaddr,
     amr_prot = ppc_hash64_amr_prot(cpu, pte);
     prot = exec_prot & pp_prot & amr_prot;
 
-    need_prot = prot_for_access_type(rwx);
+    need_prot = prot_for_access_type(access_type);
     if (need_prot & ~prot) {
         /* Access right violation */
         qemu_log_mask(CPU_LOG_MMU, "PTE access rejected\n");
-        if (rwx == 2) {
+        if (access_type == MMU_INST_FETCH) {
             int srr1 = 0;
             if (PAGE_EXEC & ~exec_prot) {
                 srr1 |= SRR1_NOEXEC_GUARD; /* Access violates noexec or guard */
@@ -1017,7 +1034,7 @@ int ppc_hash64_handle_mmu_fault(PowerPCCPU *cpu, vaddr eaddr,
             if (need_prot & ~pp_prot) {
                 dsisr |= DSISR_PROTFAULT;
             }
-            if (rwx == 1) {
+            if (access_type == MMU_DATA_STORE) {
                 dsisr |= DSISR_ISSTORE;
             }
             if (need_prot & ~amr_prot) {
@@ -1036,7 +1053,7 @@ int ppc_hash64_handle_mmu_fault(PowerPCCPU *cpu, vaddr eaddr,
         ppc_hash64_set_r(cpu, ptex, pte.pte1);
     }
     if (!(pte.pte1 & HPTE64_R_C)) {
-        if (rwx == 1) {
+        if (access_type == MMU_DATA_STORE) {
             ppc_hash64_set_c(cpu, ptex, pte.pte1);
         } else {
             /*