target-ppc: Disentangle hash mmu paths for cpu_ppc_handle_mmu_fault

cpu_ppc_handle_mmu_fault() calls get_physical_address() (whose behaviour
depends on MMU type) then, if that fails, issues an appropriate exception
- which again has a number of dependencies on MMU type.

This patch starts converting cpu_ppc_handle_mmu_fault() to have a
single switch on MMU type, calling MMU specific fault handler
functions which deal with both translation and exception delivery
appropriately for the MMU type.  We convert 32-bit and 64-bit hash
MMUs to this new model, but the existing code is left in place for
other MMU types for now.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>

target-ppc/mmu-hash32.c

@@ -303,6 +303,7 @@ static int get_segment32(CPUPPCState *env, mmu_ctx_t *ctx,
     return ret;
 }
 
+
 int ppc_hash32_get_physical_address(CPUPPCState *env, mmu_ctx_t *ctx,
                                     target_ulong eaddr, int rw, int access_type)
 {
@@ -327,3 +328,126 @@ int ppc_hash32_get_physical_address(CPUPPCState *env, mmu_ctx_t *ctx,
         return ret;
     }
 }
+
+int ppc_hash32_handle_mmu_fault(CPUPPCState *env, target_ulong address, int rw,
+                                int mmu_idx)
+{
+    mmu_ctx_t ctx;
+    int access_type;
+    int ret = 0;
+
+    if (rw == 2) {
+        /* code access */
+        rw = 0;
+        access_type = ACCESS_CODE;
+    } else {
+        /* data access */
+        access_type = env->access_type;
+    }
+    ret = ppc_hash32_get_physical_address(env, &ctx, address, rw, access_type);
+    if (ret == 0) {
+        tlb_set_page(env, address & TARGET_PAGE_MASK,
+                     ctx.raddr & TARGET_PAGE_MASK, ctx.prot,
+                     mmu_idx, TARGET_PAGE_SIZE);
+        ret = 0;
+    } else if (ret < 0) {
+        LOG_MMU_STATE(env);
+        if (access_type == ACCESS_CODE) {
+            switch (ret) {
+            case -1:
+                /* No matches in page tables or TLB */
+                env->exception_index = POWERPC_EXCP_ISI;
+                env->error_code = 0x40000000;
+                break;
+            case -2:
+                /* Access rights violation */
+                env->exception_index = POWERPC_EXCP_ISI;
+                env->error_code = 0x08000000;
+                break;
+            case -3:
+                /* No execute protection violation */
+                env->exception_index = POWERPC_EXCP_ISI;
+                env->error_code = 0x10000000;
+                break;
+            case -4:
+                /* Direct store exception */
+                /* No code fetch is allowed in direct-store areas */
+                env->exception_index = POWERPC_EXCP_ISI;
+                env->error_code = 0x10000000;
+                break;
+            }
+        } else {
+            switch (ret) {
+            case -1:
+                /* No matches in page tables or TLB */
+                env->exception_index = POWERPC_EXCP_DSI;
+                env->error_code = 0;
+                env->spr[SPR_DAR] = address;
+                if (rw == 1) {
+                    env->spr[SPR_DSISR] = 0x42000000;
+                } else {
+                    env->spr[SPR_DSISR] = 0x40000000;
+                }
+                break;
+            case -2:
+                /* Access rights violation */
+                env->exception_index = POWERPC_EXCP_DSI;
+                env->error_code = 0;
+                env->spr[SPR_DAR] = address;
+                if (rw == 1) {
+                    env->spr[SPR_DSISR] = 0x0A000000;
+                } else {
+                    env->spr[SPR_DSISR] = 0x08000000;
+                }
+                break;
+            case -4:
+                /* Direct store exception */
+                switch (access_type) {
+                case ACCESS_FLOAT:
+                    /* Floating point load/store */
+                    env->exception_index = POWERPC_EXCP_ALIGN;
+                    env->error_code = POWERPC_EXCP_ALIGN_FP;
+                    env->spr[SPR_DAR] = address;
+                    break;
+                case ACCESS_RES:
+                    /* lwarx, ldarx or stwcx. */
+                    env->exception_index = POWERPC_EXCP_DSI;
+                    env->error_code = 0;
+                    env->spr[SPR_DAR] = address;
+                    if (rw == 1) {
+                        env->spr[SPR_DSISR] = 0x06000000;
+                    } else {
+                        env->spr[SPR_DSISR] = 0x04000000;
+                    }
+                    break;
+                case ACCESS_EXT:
+                    /* eciwx or ecowx */
+                    env->exception_index = POWERPC_EXCP_DSI;
+                    env->error_code = 0;
+                    env->spr[SPR_DAR] = address;
+                    if (rw == 1) {
+                        env->spr[SPR_DSISR] = 0x06100000;
+                    } else {
+                        env->spr[SPR_DSISR] = 0x04100000;
+                    }
+                    break;
+                default:
+                    printf("DSI: invalid exception (%d)\n", ret);
+                    env->exception_index = POWERPC_EXCP_PROGRAM;
+                    env->error_code =
+                        POWERPC_EXCP_INVAL | POWERPC_EXCP_INVAL_INVAL;
+                    env->spr[SPR_DAR] = address;
+                    break;
+                }
+                break;
+            }
+        }
+#if 0
+        printf("%s: set exception to %d %02x\n", __func__,
+               env->exception, env->error_code);
+#endif
+        ret = 1;
+    }
+
+    return ret;
+}

target-ppc/mmu-hash32.h

@@ -6,6 +6,8 @@
 int pte32_is_valid(target_ulong pte0);
 int ppc_hash32_get_physical_address(CPUPPCState *env, mmu_ctx_t *ctx,
                                     target_ulong eaddr, int rw, int access_type);
+int ppc_hash32_handle_mmu_fault(CPUPPCState *env, target_ulong address, int rw,
+                                int mmu_idx);
 
 #endif /* CONFIG_USER_ONLY */
 

target-ppc/mmu-hash64.c

@@ -450,3 +450,90 @@ int ppc_hash64_get_physical_address(CPUPPCState *env, mmu_ctx_t *ctx,
         return get_segment64(env, ctx, eaddr, rw, access_type);
     }
 }
+
+int ppc_hash64_handle_mmu_fault(CPUPPCState *env, target_ulong address, int rw,
+                                int mmu_idx)
+{
+    mmu_ctx_t ctx;
+    int access_type;
+    int ret = 0;
+
+    if (rw == 2) {
+        /* code access */
+        rw = 0;
+        access_type = ACCESS_CODE;
+    } else {
+        /* data access */
+        access_type = env->access_type;
+    }
+    ret = ppc_hash64_get_physical_address(env, &ctx, address, rw, access_type);
+    if (ret == 0) {
+        tlb_set_page(env, address & TARGET_PAGE_MASK,
+                     ctx.raddr & TARGET_PAGE_MASK, ctx.prot,
+                     mmu_idx, TARGET_PAGE_SIZE);
+        ret = 0;
+    } else if (ret < 0) {
+        LOG_MMU_STATE(env);
+        if (access_type == ACCESS_CODE) {
+            switch (ret) {
+            case -1:
+                env->exception_index = POWERPC_EXCP_ISI;
+                env->error_code = 0x40000000;
+                break;
+            case -2:
+                /* Access rights violation */
+                env->exception_index = POWERPC_EXCP_ISI;
+                env->error_code = 0x08000000;
+                break;
+            case -3:
+                /* No execute protection violation */
+                env->exception_index = POWERPC_EXCP_ISI;
+                env->error_code = 0x10000000;
+                break;
+            case -5:
+                /* No match in segment table */
+                env->exception_index = POWERPC_EXCP_ISEG;
+                env->error_code = 0;
+                break;
+            }
+        } else {
+            switch (ret) {
+            case -1:
+                /* No matches in page tables or TLB */
+                env->exception_index = POWERPC_EXCP_DSI;
+                env->error_code = 0;
+                env->spr[SPR_DAR] = address;
+                if (rw == 1) {
+                    env->spr[SPR_DSISR] = 0x42000000;
+                } else {
+                    env->spr[SPR_DSISR] = 0x40000000;
+                }
+                break;
+            case -2:
+                /* Access rights violation */
+                env->exception_index = POWERPC_EXCP_DSI;
+                env->error_code = 0;
+                env->spr[SPR_DAR] = address;
+                if (rw == 1) {
+                    env->spr[SPR_DSISR] = 0x0A000000;
+                } else {
+                    env->spr[SPR_DSISR] = 0x08000000;
+                }
+                break;
+            case -5:
+                /* No match in segment table */
+                env->exception_index = POWERPC_EXCP_DSEG;
+                env->error_code = 0;
+                env->spr[SPR_DAR] = address;
+                break;
+            }
+        }
+#if 0
+        printf("%s: set exception to %d %02x\n", __func__,
+               env->exception, env->error_code);
+#endif
+        ret = 1;
+    }
+
+    return ret;
+}

target-ppc/mmu-hash64.h

@@ -8,6 +8,8 @@ void dump_slb(FILE *f, fprintf_function cpu_fprintf, CPUPPCState *env);
 int ppc_store_slb (CPUPPCState *env, target_ulong rb, target_ulong rs);
 int ppc_hash64_get_physical_address(CPUPPCState *env, mmu_ctx_t *ctx,
                                     target_ulong eaddr, int rw, int access_type);
+int ppc_hash64_handle_mmu_fault(CPUPPCState *env, target_ulong address, int rw,
+                                int mmu_idx);
 #endif
 
 #endif /* CONFIG_USER_ONLY */

target-ppc/mmu_helper.c

@@ -1438,6 +1438,22 @@ int cpu_ppc_handle_mmu_fault(CPUPPCState *env, target_ulong address, int rw,
     int access_type;
     int ret = 0;
 
+    switch (env->mmu_model) {
+#if defined(TARGET_PPC64)
+    case POWERPC_MMU_64B:
+    case POWERPC_MMU_2_06:
+    case POWERPC_MMU_2_06d:
+        return ppc_hash64_handle_mmu_fault(env, address, rw, mmu_idx);
+#endif
+
+    case POWERPC_MMU_32B:
+    case POWERPC_MMU_601:
+        return ppc_hash32_handle_mmu_fault(env, address, rw, mmu_idx);
+
+    default:
+        ; /* Otherwise fall through to the general code below */
+    }
+
     if (rw == 2) {
         /* code access */
         rw = 0;
@@ -1475,16 +1491,6 @@ int cpu_ppc_handle_mmu_fault(CPUPPCState *env, target_ulong address, int rw,
                     env->spr[SPR_40x_DEAR] = address;
                     env->spr[SPR_40x_ESR] = 0x00000000;
                     break;
-                case POWERPC_MMU_32B:
-                case POWERPC_MMU_601:
-#if defined(TARGET_PPC64)
-                case POWERPC_MMU_64B:
-                case POWERPC_MMU_2_06:
-                case POWERPC_MMU_2_06d:
-#endif
-                    env->exception_index = POWERPC_EXCP_ISI;
-                    env->error_code = 0x40000000;
-                    break;
                 case POWERPC_MMU_BOOKE206:
                     booke206_update_mas_tlb_miss(env, address, rw);
                     /* fall through */
@@ -1526,13 +1532,6 @@ int cpu_ppc_handle_mmu_fault(CPUPPCState *env, target_ulong address, int rw,
                 env->exception_index = POWERPC_EXCP_ISI;
                 env->error_code = 0x10000000;
                 break;
-#if defined(TARGET_PPC64)
-            case -5:
-                /* No match in segment table */
-                env->exception_index = POWERPC_EXCP_ISEG;
-                env->error_code = 0;
-                break;
-#endif
             }
         } else {
             switch (ret) {
@@ -1580,22 +1579,6 @@ int cpu_ppc_handle_mmu_fault(CPUPPCState *env, target_ulong address, int rw,
                         env->spr[SPR_40x_ESR] = 0x00000000;
                     }
                     break;
-                case POWERPC_MMU_32B:
-                case POWERPC_MMU_601:
-#if defined(TARGET_PPC64)
-                case POWERPC_MMU_64B:
-                case POWERPC_MMU_2_06:
-                case POWERPC_MMU_2_06d:
-#endif
-                    env->exception_index = POWERPC_EXCP_DSI;
-                    env->error_code = 0;
-                    env->spr[SPR_DAR] = address;
-                    if (rw == 1) {
-                        env->spr[SPR_DSISR] = 0x42000000;
-                    } else {
-                        env->spr[SPR_DSISR] = 0x40000000;
-                    }
-                    break;
                 case POWERPC_MMU_MPC8xx:
                     /* XXX: TODO */
                     cpu_abort(env, "MPC8xx MMU model is not implemented\n");
@@ -1681,14 +1664,6 @@ int cpu_ppc_handle_mmu_fault(CPUPPCState *env, target_ulong address, int rw,
                     break;
                 }
                 break;
-#if defined(TARGET_PPC64)
-            case -5:
-                /* No match in segment table */
-                env->exception_index = POWERPC_EXCP_DSEG;
-                env->error_code = 0;
-                env->spr[SPR_DAR] = address;
-                break;
-#endif
             }
         }
 #if 0