target-ppc: Split user only code out of mmu_helper.c

mmu_helper.c is, for obvious reasons, almost entirely concerned with
softmmu builds of qemu.  However, it does contain one stub function which
is used when CONFIG_USER_ONLY=y - the user only versoin of
cpu_ppc_handle_mmu_fault, which always triggers an exception.  The entire
rest of the file is surrounded by #if !defined(CONFIG_USER_ONLY).

We clean this up by moving the user only stub into its own new file,
removing the ifdefs and building mmu_helper.c only when CONFIG_SOFTMMU
is set.  This also lets us remove the #define of cpu_handle_mmu_fault to
cpu_ppc_handle_mmu_fault - that name is only used from generic code for
user only - so we just name our split user version by the generic name.

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

target-ppc/Makefile.objs

@@ -1,14 +1,14 @@
 obj-y += cpu-models.o
 obj-y += translate.o
 ifeq ($(CONFIG_SOFTMMU),y)
-obj-y += machine.o mmu-hash32.o
+obj-y += machine.o mmu_helper.o mmu-hash32.o
 obj-$(TARGET_PPC64) += mmu-hash64.o
 endif
 obj-$(CONFIG_KVM) += kvm.o kvm_ppc.o
 obj-y += excp_helper.o
 obj-y += fpu_helper.o
 obj-y += int_helper.o
-obj-y += mmu_helper.o
 obj-y += timebase_helper.o
 obj-y += misc_helper.o
 obj-y += mem_helper.o
+obj-$(CONFIG_USER_ONLY) += user_only_helper.o

target-ppc/cpu.h

@@ -1092,8 +1092,11 @@ int cpu_ppc_signal_handler (int host_signum, void *pinfo,
                             void *puc);
 int cpu_ppc_handle_mmu_fault (CPUPPCState *env, target_ulong address, int rw,
                               int mmu_idx);
-#define cpu_handle_mmu_fault cpu_ppc_handle_mmu_fault
 void ppc_hw_interrupt (CPUPPCState *env);
+#if defined(CONFIG_USER_ONLY)
+int cpu_handle_mmu_fault(CPUPPCState *env, target_ulong address, int rw,
+                         int mmu_idx);
+#endif
 
 #if !defined(CONFIG_USER_ONLY)
 void ppc_store_sdr1 (CPUPPCState *env, target_ulong value);

target-ppc/mmu_helper.c

@@ -52,31 +52,6 @@
 
 /*****************************************************************************/
 /* PowerPC MMU emulation */
-#if defined(CONFIG_USER_ONLY)
-int cpu_ppc_handle_mmu_fault(CPUPPCState *env, target_ulong address, int rw,
-                             int mmu_idx)
-{
-    int exception, error_code;
-
-    if (rw == 2) {
-        exception = POWERPC_EXCP_ISI;
-        error_code = 0x40000000;
-    } else {
-        exception = POWERPC_EXCP_DSI;
-        error_code = 0x40000000;
-        if (rw) {
-            error_code |= 0x02000000;
-        }
-        env->spr[SPR_DAR] = address;
-        env->spr[SPR_DSISR] = error_code;
-    }
-    env->exception_index = exception;
-    env->error_code = error_code;
-
-    return 1;
-}
-
-#else
 
 /* Context used internally during MMU translations */
 typedef struct mmu_ctx_t mmu_ctx_t;
@@ -2027,9 +2002,7 @@ void helper_store_sr(CPUPPCState *env, target_ulong srnum, target_ulong value)
 #endif
     }
 }
-#endif /* !defined(CONFIG_USER_ONLY) */
 
-#if !defined(CONFIG_USER_ONLY)
 /* TLB management */
 void helper_tlbia(CPUPPCState *env)
 {
@@ -2804,4 +2777,3 @@ void helper_booke206_tlbflush(CPUPPCState *env, uint32_t type)
 
     booke206_flush_tlb(env, flags, 1);
 }
-#endif

target-ppc/user_only_helper.c

@@ -0,0 +1,44 @@
+/*
+ *  PowerPC MMU stub handling for user mode emulation
+ *
+ *  Copyright (c) 2003-2007 Jocelyn Mayer
+ *  Copyright (c) 2013 David Gibson, IBM Corporation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "cpu.h"
+
+int cpu_handle_mmu_fault(CPUPPCState *env, target_ulong address, int rw,
+                         int mmu_idx)
+{
+    int exception, error_code;
+
+    if (rw == 2) {
+        exception = POWERPC_EXCP_ISI;
+        error_code = 0x40000000;
+    } else {
+        exception = POWERPC_EXCP_DSI;
+        error_code = 0x40000000;
+        if (rw) {
+            error_code |= 0x02000000;
+        }
+        env->spr[SPR_DAR] = address;
+        env->spr[SPR_DSISR] = error_code;
+    }
+    env->exception_index = exception;
+    env->error_code = error_code;
+
+    return 1;
+}