1 files changed, 162 insertions, 0 deletions
diff --git a/target/moxie/helper.c b/target/moxie/helper.c
new file mode 100644
index 0000000000..330299f5a7
--- /dev/null
+++ b/target/moxie/helper.c
@@ -0,0 +1,162 @@
+/*
+ *  Moxie helper routines.
+ *
+ *  Copyright (c) 2008, 2009, 2010, 2013 Anthony Green
+ *
+ * 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 General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "qemu/osdep.h"
+
+#include "cpu.h"
+#include "mmu.h"
+#include "exec/exec-all.h"
+#include "exec/cpu_ldst.h"
+#include "qemu/host-utils.h"
+#include "exec/helper-proto.h"
+
+/* Try to fill the TLB and return an exception if error. If retaddr is
+   NULL, it means that the function was called in C code (i.e. not
+   from generated code or from helper.c) */
+void tlb_fill(CPUState *cs, target_ulong addr, MMUAccessType access_type,
+              int mmu_idx, uintptr_t retaddr)
+{
+    int ret;
+
+    ret = moxie_cpu_handle_mmu_fault(cs, addr, access_type, mmu_idx);
+    if (unlikely(ret)) {
+        if (retaddr) {
+            cpu_restore_state(cs, retaddr);
+        }
+    }
+    cpu_loop_exit(cs);
+}
+
+void helper_raise_exception(CPUMoxieState *env, int ex)
+{
+    CPUState *cs = CPU(moxie_env_get_cpu(env));
+
+    cs->exception_index = ex;
+    /* Stash the exception type.  */
+    env->sregs[2] = ex;
+    /* Stash the address where the exception occurred.  */
+    cpu_restore_state(cs, GETPC());
+    env->sregs[5] = env->pc;
+    /* Jump to the exception handline routine.  */
+    env->pc = env->sregs[1];
+    cpu_loop_exit(cs);
+}
+
+uint32_t helper_div(CPUMoxieState *env, uint32_t a, uint32_t b)
+{
+    if (unlikely(b == 0)) {
+        helper_raise_exception(env, MOXIE_EX_DIV0);
+        return 0;
+    }
+    if (unlikely(a == INT_MIN && b == -1)) {
+        return INT_MIN;
+    }
+
+    return (int32_t)a / (int32_t)b;
+}
+
+uint32_t helper_udiv(CPUMoxieState *env, uint32_t a, uint32_t b)
+{
+    if (unlikely(b == 0)) {
+        helper_raise_exception(env, MOXIE_EX_DIV0);
+        return 0;
+    }
+    return a / b;
+}
+
+void helper_debug(CPUMoxieState *env)
+{
+    CPUState *cs = CPU(moxie_env_get_cpu(env));
+
+    cs->exception_index = EXCP_DEBUG;
+    cpu_loop_exit(cs);
+}
+
+#if defined(CONFIG_USER_ONLY)
+
+void moxie_cpu_do_interrupt(CPUState *cs)
+{
+    CPUState *cs = CPU(moxie_env_get_cpu(env));
+
+    cs->exception_index = -1;
+}
+
+int moxie_cpu_handle_mmu_fault(CPUState *cs, vaddr address,
+                               int rw, int mmu_idx)
+{
+    MoxieCPU *cpu = MOXIE_CPU(cs);
+
+    cs->exception_index = 0xaa;
+    cpu->env.debug1 = address;
+    cpu_dump_state(cs, stderr, fprintf, 0);
+    return 1;
+}
+
+#else /* !CONFIG_USER_ONLY */
+
+int moxie_cpu_handle_mmu_fault(CPUState *cs, vaddr address,
+                               int rw, int mmu_idx)
+{
+    MoxieCPU *cpu = MOXIE_CPU(cs);
+    CPUMoxieState *env = &cpu->env;
+    MoxieMMUResult res;
+    int prot, miss;
+    target_ulong phy;
+    int r = 1;
+
+    address &= TARGET_PAGE_MASK;
+    prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
+    miss = moxie_mmu_translate(&res, env, address, rw, mmu_idx);
+    if (miss) {
+        /* handle the miss.  */
+        phy = 0;
+        cs->exception_index = MOXIE_EX_MMU_MISS;
+    } else {
+        phy = res.phy;
+        r = 0;
+    }
+    tlb_set_page(cs, address, phy, prot, mmu_idx, TARGET_PAGE_SIZE);
+    return r;
+}
+
+
+void moxie_cpu_do_interrupt(CPUState *cs)
+{
+    switch (cs->exception_index) {
+    case MOXIE_EX_BREAK:
+        break;
+    default:
+        break;
+    }
+}
+
+hwaddr moxie_cpu_get_phys_page_debug(CPUState *cs, vaddr addr)
+{
+    MoxieCPU *cpu = MOXIE_CPU(cs);
+    uint32_t phy = addr;
+    MoxieMMUResult res;
+    int miss;
+
+    miss = moxie_mmu_translate(&res, &cpu->env, addr, 0, 0);
+    if (!miss) {
+        phy = res.phy;
+    }
+    return phy;
+}
+#endif