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-rw-r--r--qemu/target-moxie/helper.c165
1 files changed, 165 insertions, 0 deletions
diff --git a/qemu/target-moxie/helper.c b/qemu/target-moxie/helper.c
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+++ b/qemu/target-moxie/helper.c
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+/*
+ * 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 <stdio.h>
+#include <string.h>
+#include <assert.h>
+
+#include "config.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, int is_write, int mmu_idx,
+ uintptr_t retaddr)
+{
+ int ret;
+
+ ret = moxie_cpu_handle_mmu_fault(cs, addr, is_write, 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 the 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