Initial import of qemu-2.4.1HEADmaster

1 files changed, 886 insertions, 0 deletions

diff --git a/target-m68k/helper.c b/target-m68k/helper.c
new file mode 100644
index 00000000..77225a20
--- /dev/null
+++ b/target-m68k/helper.c
@@ -0,0 +1,886 @@
+/*
+ *  m68k op helpers
+ *
+ *  Copyright (c) 2006-2007 CodeSourcery
+ *  Written by Paul Brook
+ *
+ * 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
+ * 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"
+#include "exec/gdbstub.h"
+
+#include "exec/helper-proto.h"
+
+#define SIGNBIT (1u << 31)
+
+/* Sort alphabetically, except for "any". */
+static gint m68k_cpu_list_compare(gconstpointer a, gconstpointer b)
+{
+    ObjectClass *class_a = (ObjectClass *)a;
+    ObjectClass *class_b = (ObjectClass *)b;
+    const char *name_a, *name_b;
+
+    name_a = object_class_get_name(class_a);
+    name_b = object_class_get_name(class_b);
+    if (strcmp(name_a, "any-" TYPE_M68K_CPU) == 0) {
+        return 1;
+    } else if (strcmp(name_b, "any-" TYPE_M68K_CPU) == 0) {
+        return -1;
+    } else {
+        return strcasecmp(name_a, name_b);
+    }
+}
+
+static void m68k_cpu_list_entry(gpointer data, gpointer user_data)
+{
+    ObjectClass *c = data;
+    CPUListState *s = user_data;
+    const char *typename;
+    char *name;
+
+    typename = object_class_get_name(c);
+    name = g_strndup(typename, strlen(typename) - strlen("-" TYPE_M68K_CPU));
+    (*s->cpu_fprintf)(s->file, "%s\n",
+                      name);
+    g_free(name);
+}
+
+void m68k_cpu_list(FILE *f, fprintf_function cpu_fprintf)
+{
+    CPUListState s = {
+        .file = f,
+        .cpu_fprintf = cpu_fprintf,
+    };
+    GSList *list;
+
+    list = object_class_get_list(TYPE_M68K_CPU, false);
+    list = g_slist_sort(list, m68k_cpu_list_compare);
+    g_slist_foreach(list, m68k_cpu_list_entry, &s);
+    g_slist_free(list);
+}
+
+static int fpu_gdb_get_reg(CPUM68KState *env, uint8_t *mem_buf, int n)
+{
+    if (n < 8) {
+        stfq_p(mem_buf, env->fregs[n]);
+        return 8;
+    }
+    if (n < 11) {
+        /* FP control registers (not implemented)  */
+        memset(mem_buf, 0, 4);
+        return 4;
+    }
+    return 0;
+}
+
+static int fpu_gdb_set_reg(CPUM68KState *env, uint8_t *mem_buf, int n)
+{
+    if (n < 8) {
+        env->fregs[n] = ldfq_p(mem_buf);
+        return 8;
+    }
+    if (n < 11) {
+        /* FP control registers (not implemented)  */
+        return 4;
+    }
+    return 0;
+}
+
+M68kCPU *cpu_m68k_init(const char *cpu_model)
+{
+    M68kCPU *cpu;
+    CPUM68KState *env;
+    ObjectClass *oc;
+
+    oc = cpu_class_by_name(TYPE_M68K_CPU, cpu_model);
+    if (oc == NULL) {
+        return NULL;
+    }
+    cpu = M68K_CPU(object_new(object_class_get_name(oc)));
+    env = &cpu->env;
+
+    register_m68k_insns(env);
+
+    object_property_set_bool(OBJECT(cpu), true, "realized", NULL);
+
+    return cpu;
+}
+
+void m68k_cpu_init_gdb(M68kCPU *cpu)
+{
+    CPUState *cs = CPU(cpu);
+    CPUM68KState *env = &cpu->env;
+
+    if (m68k_feature(env, M68K_FEATURE_CF_FPU)) {
+        gdb_register_coprocessor(cs, fpu_gdb_get_reg, fpu_gdb_set_reg,
+                                 11, "cf-fp.xml", 18);
+    }
+    /* TODO: Add [E]MAC registers.  */
+}
+
+void cpu_m68k_flush_flags(CPUM68KState *env, int cc_op)
+{
+    M68kCPU *cpu = m68k_env_get_cpu(env);
+    int flags;
+    uint32_t src;
+    uint32_t dest;
+    uint32_t tmp;
+
+#define HIGHBIT 0x80000000u
+
+#define SET_NZ(x) do { \
+    if ((x) == 0) \
+        flags |= CCF_Z; \
+    else if ((int32_t)(x) < 0) \
+        flags |= CCF_N; \
+    } while (0)
+
+#define SET_FLAGS_SUB(type, utype) do { \
+    SET_NZ((type)dest); \
+    tmp = dest + src; \
+    if ((utype) tmp < (utype) src) \
+        flags |= CCF_C; \
+    if ((1u << (sizeof(type) * 8 - 1)) & (tmp ^ dest) & (tmp ^ src)) \
+        flags |= CCF_V; \
+    } while (0)
+
+    flags = 0;
+    src = env->cc_src;
+    dest = env->cc_dest;
+    switch (cc_op) {
+    case CC_OP_FLAGS:
+        flags = dest;
+        break;
+    case CC_OP_LOGIC:
+        SET_NZ(dest);
+        break;
+    case CC_OP_ADD:
+        SET_NZ(dest);
+        if (dest < src)
+            flags |= CCF_C;
+        tmp = dest - src;
+        if (HIGHBIT & (src ^ dest) & ~(tmp ^ src))
+            flags |= CCF_V;
+        break;
+    case CC_OP_SUB:
+        SET_FLAGS_SUB(int32_t, uint32_t);
+        break;
+    case CC_OP_CMPB:
+        SET_FLAGS_SUB(int8_t, uint8_t);
+        break;
+    case CC_OP_CMPW:
+        SET_FLAGS_SUB(int16_t, uint16_t);
+        break;
+    case CC_OP_ADDX:
+        SET_NZ(dest);
+        if (dest <= src)
+            flags |= CCF_C;
+        tmp = dest - src - 1;
+        if (HIGHBIT & (src ^ dest) & ~(tmp ^ src))
+            flags |= CCF_V;
+        break;
+    case CC_OP_SUBX:
+        SET_NZ(dest);
+        tmp = dest + src + 1;
+        if (tmp <= src)
+            flags |= CCF_C;
+        if (HIGHBIT & (tmp ^ dest) & (tmp ^ src))
+            flags |= CCF_V;
+        break;
+    case CC_OP_SHIFT:
+        SET_NZ(dest);
+        if (src)
+            flags |= CCF_C;
+        break;
+    default:
+        cpu_abort(CPU(cpu), "Bad CC_OP %d", cc_op);
+    }
+    env->cc_op = CC_OP_FLAGS;
+    env->cc_dest = flags;
+}
+
+void HELPER(movec)(CPUM68KState *env, uint32_t reg, uint32_t val)
+{
+    M68kCPU *cpu = m68k_env_get_cpu(env);
+
+    switch (reg) {
+    case 0x02: /* CACR */
+        env->cacr = val;
+        m68k_switch_sp(env);
+        break;
+    case 0x04: case 0x05: case 0x06: case 0x07: /* ACR[0-3] */
+        /* TODO: Implement Access Control Registers.  */
+        break;
+    case 0x801: /* VBR */
+        env->vbr = val;
+        break;
+    /* TODO: Implement control registers.  */
+    default:
+        cpu_abort(CPU(cpu), "Unimplemented control register write 0x%x = 0x%x\n",
+                  reg, val);
+    }
+}
+
+void HELPER(set_macsr)(CPUM68KState *env, uint32_t val)
+{
+    uint32_t acc;
+    int8_t exthigh;
+    uint8_t extlow;
+    uint64_t regval;
+    int i;
+    if ((env->macsr ^ val) & (MACSR_FI | MACSR_SU)) {
+        for (i = 0; i < 4; i++) {
+            regval = env->macc[i];
+            exthigh = regval >> 40;
+            if (env->macsr & MACSR_FI) {
+                acc = regval >> 8;
+                extlow = regval;
+            } else {
+                acc = regval;
+                extlow = regval >> 32;
+            }
+            if (env->macsr & MACSR_FI) {
+                regval = (((uint64_t)acc) << 8) | extlow;
+                regval |= ((int64_t)exthigh) << 40;
+            } else if (env->macsr & MACSR_SU) {
+                regval = acc | (((int64_t)extlow) << 32);
+                regval |= ((int64_t)exthigh) << 40;
+            } else {
+                regval = acc | (((uint64_t)extlow) << 32);
+                regval |= ((uint64_t)(uint8_t)exthigh) << 40;
+            }
+            env->macc[i] = regval;
+        }
+    }
+    env->macsr = val;
+}
+
+void m68k_switch_sp(CPUM68KState *env)
+{
+    int new_sp;
+
+    env->sp[env->current_sp] = env->aregs[7];
+    new_sp = (env->sr & SR_S && env->cacr & M68K_CACR_EUSP)
+             ? M68K_SSP : M68K_USP;
+    env->aregs[7] = env->sp[new_sp];
+    env->current_sp = new_sp;
+}
+
+#if defined(CONFIG_USER_ONLY)
+
+int m68k_cpu_handle_mmu_fault(CPUState *cs, vaddr address, int rw,
+                              int mmu_idx)
+{
+    M68kCPU *cpu = M68K_CPU(cs);
+
+    cs->exception_index = EXCP_ACCESS;
+    cpu->env.mmu.ar = address;
+    return 1;
+}
+
+#else
+
+/* MMU */
+
+/* TODO: This will need fixing once the MMU is implemented.  */
+hwaddr m68k_cpu_get_phys_page_debug(CPUState *cs, vaddr addr)
+{
+    return addr;
+}
+
+int m68k_cpu_handle_mmu_fault(CPUState *cs, vaddr address, int rw,
+                              int mmu_idx)
+{
+    int prot;
+
+    address &= TARGET_PAGE_MASK;
+    prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
+    tlb_set_page(cs, address, address, prot, mmu_idx, TARGET_PAGE_SIZE);
+    return 0;
+}
+
+/* Notify CPU of a pending interrupt.  Prioritization and vectoring should
+   be handled by the interrupt controller.  Real hardware only requests
+   the vector when the interrupt is acknowledged by the CPU.  For
+   simplicitly we calculate it when the interrupt is signalled.  */
+void m68k_set_irq_level(M68kCPU *cpu, int level, uint8_t vector)
+{
+    CPUState *cs = CPU(cpu);
+    CPUM68KState *env = &cpu->env;
+
+    env->pending_level = level;
+    env->pending_vector = vector;
+    if (level) {
+        cpu_interrupt(cs, CPU_INTERRUPT_HARD);
+    } else {
+        cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
+    }
+}
+
+#endif
+
+uint32_t HELPER(bitrev)(uint32_t x)
+{
+    x = ((x >> 1) & 0x55555555u) | ((x << 1) & 0xaaaaaaaau);
+    x = ((x >> 2) & 0x33333333u) | ((x << 2) & 0xccccccccu);
+    x = ((x >> 4) & 0x0f0f0f0fu) | ((x << 4) & 0xf0f0f0f0u);
+    return bswap32(x);
+}
+
+uint32_t HELPER(ff1)(uint32_t x)
+{
+    int n;
+    for (n = 32; x; n--)
+        x >>= 1;
+    return n;
+}
+
+uint32_t HELPER(sats)(uint32_t val, uint32_t ccr)
+{
+    /* The result has the opposite sign to the original value.  */
+    if (ccr & CCF_V)
+        val = (((int32_t)val) >> 31) ^ SIGNBIT;
+    return val;
+}
+
+uint32_t HELPER(subx_cc)(CPUM68KState *env, uint32_t op1, uint32_t op2)
+{
+    uint32_t res;
+    uint32_t old_flags;
+
+    old_flags = env->cc_dest;
+    if (env->cc_x) {
+        env->cc_x = (op1 <= op2);
+        env->cc_op = CC_OP_SUBX;
+        res = op1 - (op2 + 1);
+    } else {
+        env->cc_x = (op1 < op2);
+        env->cc_op = CC_OP_SUB;
+        res = op1 - op2;
+    }
+    env->cc_dest = res;
+    env->cc_src = op2;
+    cpu_m68k_flush_flags(env, env->cc_op);
+    /* !Z is sticky.  */
+    env->cc_dest &= (old_flags | ~CCF_Z);
+    return res;
+}
+
+uint32_t HELPER(addx_cc)(CPUM68KState *env, uint32_t op1, uint32_t op2)
+{
+    uint32_t res;
+    uint32_t old_flags;
+
+    old_flags = env->cc_dest;
+    if (env->cc_x) {
+        res = op1 + op2 + 1;
+        env->cc_x = (res <= op2);
+        env->cc_op = CC_OP_ADDX;
+    } else {
+        res = op1 + op2;
+        env->cc_x = (res < op2);
+        env->cc_op = CC_OP_ADD;
+    }
+    env->cc_dest = res;
+    env->cc_src = op2;
+    cpu_m68k_flush_flags(env, env->cc_op);
+    /* !Z is sticky.  */
+    env->cc_dest &= (old_flags | ~CCF_Z);
+    return res;
+}
+
+uint32_t HELPER(xflag_lt)(uint32_t a, uint32_t b)
+{
+    return a < b;
+}
+
+void HELPER(set_sr)(CPUM68KState *env, uint32_t val)
+{
+    env->sr = val & 0xffff;
+    m68k_switch_sp(env);
+}
+
+uint32_t HELPER(shl_cc)(CPUM68KState *env, uint32_t val, uint32_t shift)
+{
+    uint32_t result;
+    uint32_t cf;
+
+    shift &= 63;
+    if (shift == 0) {
+        result = val;
+        cf = env->cc_src & CCF_C;
+    } else if (shift < 32) {
+        result = val << shift;
+        cf = (val >> (32 - shift)) & 1;
+    } else if (shift == 32) {
+        result = 0;
+        cf = val & 1;
+    } else /* shift > 32 */ {
+        result = 0;
+        cf = 0;
+    }
+    env->cc_src = cf;
+    env->cc_x = (cf != 0);
+    env->cc_dest = result;
+    return result;
+}
+
+uint32_t HELPER(shr_cc)(CPUM68KState *env, uint32_t val, uint32_t shift)
+{
+    uint32_t result;
+    uint32_t cf;
+
+    shift &= 63;
+    if (shift == 0) {
+        result = val;
+        cf = env->cc_src & CCF_C;
+    } else if (shift < 32) {
+        result = val >> shift;
+        cf = (val >> (shift - 1)) & 1;
+    } else if (shift == 32) {
+        result = 0;
+        cf = val >> 31;
+    } else /* shift > 32 */ {
+        result = 0;
+        cf = 0;
+    }
+    env->cc_src = cf;
+    env->cc_x = (cf != 0);
+    env->cc_dest = result;
+    return result;
+}
+
+uint32_t HELPER(sar_cc)(CPUM68KState *env, uint32_t val, uint32_t shift)
+{
+    uint32_t result;
+    uint32_t cf;
+
+    shift &= 63;
+    if (shift == 0) {
+        result = val;
+        cf = (env->cc_src & CCF_C) != 0;
+    } else if (shift < 32) {
+        result = (int32_t)val >> shift;
+        cf = (val >> (shift - 1)) & 1;
+    } else /* shift >= 32 */ {
+        result = (int32_t)val >> 31;
+        cf = val >> 31;
+    }
+    env->cc_src = cf;
+    env->cc_x = cf;
+    env->cc_dest = result;
+    return result;
+}
+
+/* FPU helpers.  */
+uint32_t HELPER(f64_to_i32)(CPUM68KState *env, float64 val)
+{
+    return float64_to_int32(val, &env->fp_status);
+}
+
+float32 HELPER(f64_to_f32)(CPUM68KState *env, float64 val)
+{
+    return float64_to_float32(val, &env->fp_status);
+}
+
+float64 HELPER(i32_to_f64)(CPUM68KState *env, uint32_t val)
+{
+    return int32_to_float64(val, &env->fp_status);
+}
+
+float64 HELPER(f32_to_f64)(CPUM68KState *env, float32 val)
+{
+    return float32_to_float64(val, &env->fp_status);
+}
+
+float64 HELPER(iround_f64)(CPUM68KState *env, float64 val)
+{
+    return float64_round_to_int(val, &env->fp_status);
+}
+
+float64 HELPER(itrunc_f64)(CPUM68KState *env, float64 val)
+{
+    return float64_trunc_to_int(val, &env->fp_status);
+}
+
+float64 HELPER(sqrt_f64)(CPUM68KState *env, float64 val)
+{
+    return float64_sqrt(val, &env->fp_status);
+}
+
+float64 HELPER(abs_f64)(float64 val)
+{
+    return float64_abs(val);
+}
+
+float64 HELPER(chs_f64)(float64 val)
+{
+    return float64_chs(val);
+}
+
+float64 HELPER(add_f64)(CPUM68KState *env, float64 a, float64 b)
+{
+    return float64_add(a, b, &env->fp_status);
+}
+
+float64 HELPER(sub_f64)(CPUM68KState *env, float64 a, float64 b)
+{
+    return float64_sub(a, b, &env->fp_status);
+}
+
+float64 HELPER(mul_f64)(CPUM68KState *env, float64 a, float64 b)
+{
+    return float64_mul(a, b, &env->fp_status);
+}
+
+float64 HELPER(div_f64)(CPUM68KState *env, float64 a, float64 b)
+{
+    return float64_div(a, b, &env->fp_status);
+}
+
+float64 HELPER(sub_cmp_f64)(CPUM68KState *env, float64 a, float64 b)
+{
+    /* ??? This may incorrectly raise exceptions.  */
+    /* ??? Should flush denormals to zero.  */
+    float64 res;
+    res = float64_sub(a, b, &env->fp_status);
+    if (float64_is_quiet_nan(res)) {
+        /* +/-inf compares equal against itself, but sub returns nan.  */
+        if (!float64_is_quiet_nan(a)
+            && !float64_is_quiet_nan(b)) {
+            res = float64_zero;
+            if (float64_lt_quiet(a, res, &env->fp_status))
+                res = float64_chs(res);
+        }
+    }
+    return res;
+}
+
+uint32_t HELPER(compare_f64)(CPUM68KState *env, float64 val)
+{
+    return float64_compare_quiet(val, float64_zero, &env->fp_status);
+}
+
+/* MAC unit.  */
+/* FIXME: The MAC unit implementation is a bit of a mess.  Some helpers
+   take values,  others take register numbers and manipulate the contents
+   in-place.  */
+void HELPER(mac_move)(CPUM68KState *env, uint32_t dest, uint32_t src)
+{
+    uint32_t mask;
+    env->macc[dest] = env->macc[src];
+    mask = MACSR_PAV0 << dest;
+    if (env->macsr & (MACSR_PAV0 << src))
+        env->macsr |= mask;
+    else
+        env->macsr &= ~mask;
+}
+
+uint64_t HELPER(macmuls)(CPUM68KState *env, uint32_t op1, uint32_t op2)
+{
+    int64_t product;
+    int64_t res;
+
+    product = (uint64_t)op1 * op2;
+    res = (product << 24) >> 24;
+    if (res != product) {
+        env->macsr |= MACSR_V;
+        if (env->macsr & MACSR_OMC) {
+            /* Make sure the accumulate operation overflows.  */
+            if (product < 0)
+                res = ~(1ll << 50);
+            else
+                res = 1ll << 50;
+        }
+    }
+    return res;
+}
+
+uint64_t HELPER(macmulu)(CPUM68KState *env, uint32_t op1, uint32_t op2)
+{
+    uint64_t product;
+
+    product = (uint64_t)op1 * op2;
+    if (product & (0xffffffull << 40)) {
+        env->macsr |= MACSR_V;
+        if (env->macsr & MACSR_OMC) {
+            /* Make sure the accumulate operation overflows.  */
+            product = 1ll << 50;
+        } else {
+            product &= ((1ull << 40) - 1);
+        }
+    }
+    return product;
+}
+
+uint64_t HELPER(macmulf)(CPUM68KState *env, uint32_t op1, uint32_t op2)
+{
+    uint64_t product;
+    uint32_t remainder;
+
+    product = (uint64_t)op1 * op2;
+    if (env->macsr & MACSR_RT) {
+        remainder = product & 0xffffff;
+        product >>= 24;
+        if (remainder > 0x800000)
+            product++;
+        else if (remainder == 0x800000)
+            product += (product & 1);
+    } else {
+        product >>= 24;
+    }
+    return product;
+}
+
+void HELPER(macsats)(CPUM68KState *env, uint32_t acc)
+{
+    int64_t tmp;
+    int64_t result;
+    tmp = env->macc[acc];
+    result = ((tmp << 16) >> 16);
+    if (result != tmp) {
+        env->macsr |= MACSR_V;
+    }
+    if (env->macsr & MACSR_V) {
+        env->macsr |= MACSR_PAV0 << acc;
+        if (env->macsr & MACSR_OMC) {
+            /* The result is saturated to 32 bits, despite overflow occurring
+               at 48 bits.  Seems weird, but that's what the hardware docs
+               say.  */
+            result = (result >> 63) ^ 0x7fffffff;
+        }
+    }
+    env->macc[acc] = result;
+}
+
+void HELPER(macsatu)(CPUM68KState *env, uint32_t acc)
+{
+    uint64_t val;
+
+    val = env->macc[acc];
+    if (val & (0xffffull << 48)) {
+        env->macsr |= MACSR_V;
+    }
+    if (env->macsr & MACSR_V) {
+        env->macsr |= MACSR_PAV0 << acc;
+        if (env->macsr & MACSR_OMC) {
+            if (val > (1ull << 53))
+                val = 0;
+            else
+                val = (1ull << 48) - 1;
+        } else {
+            val &= ((1ull << 48) - 1);
+        }
+    }
+    env->macc[acc] = val;
+}
+
+void HELPER(macsatf)(CPUM68KState *env, uint32_t acc)
+{
+    int64_t sum;
+    int64_t result;
+
+    sum = env->macc[acc];
+    result = (sum << 16) >> 16;
+    if (result != sum) {
+        env->macsr |= MACSR_V;
+    }
+    if (env->macsr & MACSR_V) {
+        env->macsr |= MACSR_PAV0 << acc;
+        if (env->macsr & MACSR_OMC) {
+            result = (result >> 63) ^ 0x7fffffffffffll;
+        }
+    }
+    env->macc[acc] = result;
+}
+
+void HELPER(mac_set_flags)(CPUM68KState *env, uint32_t acc)
+{
+    uint64_t val;
+    val = env->macc[acc];
+    if (val == 0) {
+        env->macsr |= MACSR_Z;
+    } else if (val & (1ull << 47)) {
+        env->macsr |= MACSR_N;
+    }
+    if (env->macsr & (MACSR_PAV0 << acc)) {
+        env->macsr |= MACSR_V;
+    }
+    if (env->macsr & MACSR_FI) {
+        val = ((int64_t)val) >> 40;
+        if (val != 0 && val != -1)
+            env->macsr |= MACSR_EV;
+    } else if (env->macsr & MACSR_SU) {
+        val = ((int64_t)val) >> 32;
+        if (val != 0 && val != -1)
+            env->macsr |= MACSR_EV;
+    } else {
+        if ((val >> 32) != 0)
+            env->macsr |= MACSR_EV;
+    }
+}
+
+void HELPER(flush_flags)(CPUM68KState *env, uint32_t cc_op)
+{
+    cpu_m68k_flush_flags(env, cc_op);
+}
+
+uint32_t HELPER(get_macf)(CPUM68KState *env, uint64_t val)
+{
+    int rem;
+    uint32_t result;
+
+    if (env->macsr & MACSR_SU) {
+        /* 16-bit rounding.  */
+        rem = val & 0xffffff;
+        val = (val >> 24) & 0xffffu;
+        if (rem > 0x800000)
+            val++;
+        else if (rem == 0x800000)
+            val += (val & 1);
+    } else if (env->macsr & MACSR_RT) {
+        /* 32-bit rounding.  */
+        rem = val & 0xff;
+        val >>= 8;
+        if (rem > 0x80)
+            val++;
+        else if (rem == 0x80)
+            val += (val & 1);
+    } else {
+        /* No rounding.  */
+        val >>= 8;
+    }
+    if (env->macsr & MACSR_OMC) {
+        /* Saturate.  */
+        if (env->macsr & MACSR_SU) {
+            if (val != (uint16_t) val) {
+                result = ((val >> 63) ^ 0x7fff) & 0xffff;
+            } else {
+                result = val & 0xffff;
+            }
+        } else {
+            if (val != (uint32_t)val) {
+                result = ((uint32_t)(val >> 63) & 0x7fffffff);
+            } else {
+                result = (uint32_t)val;
+            }
+        }
+    } else {
+        /* No saturation.  */
+        if (env->macsr & MACSR_SU) {
+            result = val & 0xffff;
+        } else {
+            result = (uint32_t)val;
+        }
+    }
+    return result;
+}
+
+uint32_t HELPER(get_macs)(uint64_t val)
+{
+    if (val == (int32_t)val) {
+        return (int32_t)val;
+    } else {
+        return (val >> 61) ^ ~SIGNBIT;
+    }
+}
+
+uint32_t HELPER(get_macu)(uint64_t val)
+{
+    if ((val >> 32) == 0) {
+        return (uint32_t)val;
+    } else {
+        return 0xffffffffu;
+    }
+}
+
+uint32_t HELPER(get_mac_extf)(CPUM68KState *env, uint32_t acc)
+{
+    uint32_t val;
+    val = env->macc[acc] & 0x00ff;
+    val = (env->macc[acc] >> 32) & 0xff00;
+    val |= (env->macc[acc + 1] << 16) & 0x00ff0000;
+    val |= (env->macc[acc + 1] >> 16) & 0xff000000;
+    return val;
+}
+
+uint32_t HELPER(get_mac_exti)(CPUM68KState *env, uint32_t acc)
+{
+    uint32_t val;
+    val = (env->macc[acc] >> 32) & 0xffff;
+    val |= (env->macc[acc + 1] >> 16) & 0xffff0000;
+    return val;
+}
+
+void HELPER(set_mac_extf)(CPUM68KState *env, uint32_t val, uint32_t acc)
+{
+    int64_t res;
+    int32_t tmp;
+    res = env->macc[acc] & 0xffffffff00ull;
+    tmp = (int16_t)(val & 0xff00);
+    res |= ((int64_t)tmp) << 32;
+    res |= val & 0xff;
+    env->macc[acc] = res;
+    res = env->macc[acc + 1] & 0xffffffff00ull;
+    tmp = (val & 0xff000000);
+    res |= ((int64_t)tmp) << 16;
+    res |= (val >> 16) & 0xff;
+    env->macc[acc + 1] = res;
+}
+
+void HELPER(set_mac_exts)(CPUM68KState *env, uint32_t val, uint32_t acc)
+{
+    int64_t res;
+    int32_t tmp;
+    res = (uint32_t)env->macc[acc];
+    tmp = (int16_t)val;
+    res |= ((int64_t)tmp) << 32;
+    env->macc[acc] = res;
+    res = (uint32_t)env->macc[acc + 1];
+    tmp = val & 0xffff0000;
+    res |= (int64_t)tmp << 16;
+    env->macc[acc + 1] = res;
+}
+
+void HELPER(set_mac_extu)(CPUM68KState *env, uint32_t val, uint32_t acc)
+{
+    uint64_t res;
+    res = (uint32_t)env->macc[acc];
+    res |= ((uint64_t)(val & 0xffff)) << 32;
+    env->macc[acc] = res;
+    res = (uint32_t)env->macc[acc + 1];
+    res |= (uint64_t)(val & 0xffff0000) << 16;
+    env->macc[acc + 1] = res;
+}
+
+void m68k_cpu_exec_enter(CPUState *cs)
+{
+    M68kCPU *cpu = M68K_CPU(cs);
+    CPUM68KState *env = &cpu->env;
+
+    env->cc_op = CC_OP_FLAGS;
+    env->cc_dest = env->sr & 0xf;
+    env->cc_x = (env->sr >> 4) & 1;
+}
+
+void m68k_cpu_exec_exit(CPUState *cs)
+{
+    M68kCPU *cpu = M68K_CPU(cs);
+    CPUM68KState *env = &cpu->env;
+
+    cpu_m68k_flush_flags(env, env->cc_op);
+    env->cc_op = CC_OP_FLAGS;
+    env->sr = (env->sr & 0xffe0) | env->cc_dest | (env->cc_x << 4);
+}