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>

1 files changed, 87 insertions, 0 deletions

diff --git a/target-ppc/mmu-hash64.c b/target-ppc/mmu-hash64.c
index c7272982b8..32825ff04e 100644
--- a/target-ppc/mmu-hash64.c
+++ b/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;
+}