lm32: translation routines

This patch adds the main translation routine. All opcodes of the
LatticeMico32 processor are supported and translated to TCG ops.

Signed-off-by: Michael Walle <michael@walle.cc>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>

1 files changed, 259 insertions, 0 deletions

diff --git a/target-lm32/helper.c b/target-lm32/helper.c
new file mode 100644
index 0000000000..318e2cf6e0
--- /dev/null
+++ b/target-lm32/helper.c
@@ -0,0 +1,259 @@
+/*
+ *  LatticeMico32 helper routines.
+ *
+ *  Copyright (c) 2010 Michael Walle <michael@walle.cc>
+ *
+ * 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 <stdio.h>
+#include <string.h>
+#include <assert.h>
+
+#include "config.h"
+#include "cpu.h"
+#include "exec-all.h"
+#include "host-utils.h"
+
+int cpu_lm32_handle_mmu_fault(CPUState *env, target_ulong address, int rw,
+                               int mmu_idx, int is_softmmu)
+{
+    int prot;
+
+    address &= TARGET_PAGE_MASK;
+    prot = PAGE_BITS;
+    if (env->flags & LM32_FLAG_IGNORE_MSB) {
+        tlb_set_page(env, address, address & 0x7fffffff, prot, mmu_idx,
+                TARGET_PAGE_SIZE);
+    } else {
+        tlb_set_page(env, address, address, prot, mmu_idx, TARGET_PAGE_SIZE);
+    }
+
+    return 0;
+}
+
+target_phys_addr_t cpu_get_phys_page_debug(CPUState *env, target_ulong addr)
+{
+    return addr & TARGET_PAGE_MASK;
+}
+
+void do_interrupt(CPUState *env)
+{
+    qemu_log_mask(CPU_LOG_INT,
+            "exception at pc=%x type=%x\n", env->pc, env->exception_index);
+
+    switch (env->exception_index) {
+    case EXCP_INSN_BUS_ERROR:
+    case EXCP_DATA_BUS_ERROR:
+    case EXCP_DIVIDE_BY_ZERO:
+    case EXCP_IRQ:
+    case EXCP_SYSTEMCALL:
+        /* non-debug exceptions */
+        env->regs[R_EA] = env->pc;
+        env->ie |= (env->ie & IE_IE) ? IE_EIE : 0;
+        env->ie &= ~IE_IE;
+        if (env->dc & DC_RE) {
+            env->pc = env->deba + (env->exception_index * 32);
+        } else {
+            env->pc = env->eba + (env->exception_index * 32);
+        }
+        log_cpu_state_mask(CPU_LOG_INT, env, 0);
+        break;
+    case EXCP_BREAKPOINT:
+    case EXCP_WATCHPOINT:
+        /* debug exceptions */
+        env->regs[R_BA] = env->pc;
+        env->ie |= (env->ie & IE_IE) ? IE_BIE : 0;
+        env->ie &= ~IE_IE;
+        if (env->dc & DC_RE) {
+            env->pc = env->deba + (env->exception_index * 32);
+        } else {
+            env->pc = env->eba + (env->exception_index * 32);
+        }
+        log_cpu_state_mask(CPU_LOG_INT, env, 0);
+        break;
+    default:
+        cpu_abort(env, "unhandled exception type=%d\n",
+                  env->exception_index);
+        break;
+    }
+}
+
+typedef struct {
+    const char *name;
+    uint32_t revision;
+    uint8_t num_interrupts;
+    uint8_t num_breakpoints;
+    uint8_t num_watchpoints;
+    uint32_t features;
+} LM32Def;
+
+static const LM32Def lm32_defs[] = {
+    {
+        .name = "lm32-basic",
+        .revision = 3,
+        .num_interrupts = 32,
+        .num_breakpoints = 4,
+        .num_watchpoints = 4,
+        .features = (LM32_FEATURE_SHIFT
+                     | LM32_FEATURE_SIGN_EXTEND
+                     | LM32_FEATURE_CYCLE_COUNT),
+    },
+    {
+        .name = "lm32-standard",
+        .revision = 3,
+        .num_interrupts = 32,
+        .num_breakpoints = 4,
+        .num_watchpoints = 4,
+        .features = (LM32_FEATURE_MULTIPLY
+                     | LM32_FEATURE_DIVIDE
+                     | LM32_FEATURE_SHIFT
+                     | LM32_FEATURE_SIGN_EXTEND
+                     | LM32_FEATURE_I_CACHE
+                     | LM32_FEATURE_CYCLE_COUNT),
+    },
+    {
+        .name = "lm32-full",
+        .revision = 3,
+        .num_interrupts = 32,
+        .num_breakpoints = 4,
+        .num_watchpoints = 4,
+        .features = (LM32_FEATURE_MULTIPLY
+                     | LM32_FEATURE_DIVIDE
+                     | LM32_FEATURE_SHIFT
+                     | LM32_FEATURE_SIGN_EXTEND
+                     | LM32_FEATURE_I_CACHE
+                     | LM32_FEATURE_D_CACHE
+                     | LM32_FEATURE_CYCLE_COUNT),
+    }
+};
+
+void cpu_lm32_list(FILE *f, fprintf_function cpu_fprintf)
+{
+    int i;
+
+    cpu_fprintf(f, "Available CPUs:\n");
+    for (i = 0; i < ARRAY_SIZE(lm32_defs); i++) {
+        cpu_fprintf(f, "  %s\n", lm32_defs[i].name);
+    }
+}
+
+static const LM32Def *cpu_lm32_find_by_name(const char *name)
+{
+    int i;
+
+    for (i = 0; i < ARRAY_SIZE(lm32_defs); i++) {
+        if (strcasecmp(name, lm32_defs[i].name) == 0) {
+            return &lm32_defs[i];
+        }
+    }
+
+    return NULL;
+}
+
+static uint32_t cfg_by_def(const LM32Def *def)
+{
+    uint32_t cfg = 0;
+
+    if (def->features & LM32_FEATURE_MULTIPLY) {
+        cfg |= CFG_M;
+    }
+
+    if (def->features & LM32_FEATURE_DIVIDE) {
+        cfg |= CFG_D;
+    }
+
+    if (def->features & LM32_FEATURE_SHIFT) {
+        cfg |= CFG_S;
+    }
+
+    if (def->features & LM32_FEATURE_SIGN_EXTEND) {
+        cfg |= CFG_X;
+    }
+
+    if (def->features & LM32_FEATURE_I_CACHE) {
+        cfg |= CFG_IC;
+    }
+
+    if (def->features & LM32_FEATURE_D_CACHE) {
+        cfg |= CFG_DC;
+    }
+
+    if (def->features & LM32_FEATURE_CYCLE_COUNT) {
+        cfg |= CFG_CC;
+    }
+
+    cfg |= (def->num_interrupts << CFG_INT_SHIFT);
+    cfg |= (def->num_breakpoints << CFG_BP_SHIFT);
+    cfg |= (def->num_watchpoints << CFG_WP_SHIFT);
+    cfg |= (def->revision << CFG_REV_SHIFT);
+
+    return cfg;
+}
+
+CPUState *cpu_lm32_init(const char *cpu_model)
+{
+    CPUState *env;
+    const LM32Def *def;
+    static int tcg_initialized;
+
+    def = cpu_lm32_find_by_name(cpu_model);
+    if (!def) {
+        return NULL;
+    }
+
+    env = qemu_mallocz(sizeof(CPUState));
+
+    env->features = def->features;
+    env->num_bps = def->num_breakpoints;
+    env->num_wps = def->num_watchpoints;
+    env->cfg = cfg_by_def(def);
+    env->flags = 0;
+
+    cpu_exec_init(env);
+    cpu_reset(env);
+
+    if (!tcg_initialized) {
+        tcg_initialized = 1;
+        lm32_translate_init();
+    }
+
+    return env;
+}
+
+/* Some soc ignores the MSB on the address bus. Thus creating a shadow memory
+ * area. As a general rule, 0x00000000-0x7fffffff is cached, whereas
+ * 0x80000000-0xffffffff is not cached and used to access IO devices. */
+void cpu_lm32_set_phys_msb_ignore(CPUState *env, int value)
+{
+    if (value) {
+        env->flags |= LM32_FLAG_IGNORE_MSB;
+    } else {
+        env->flags &= ~LM32_FLAG_IGNORE_MSB;
+    }
+}
+
+void cpu_reset(CPUState *env)
+{
+    if (qemu_loglevel_mask(CPU_LOG_RESET)) {
+        qemu_log("CPU Reset (CPU %d)\n", env->cpu_index);
+        log_cpu_state(env, 0);
+    }
+
+    tlb_flush(env, 1);
+
+    /* reset cpu state */
+    memset(env, 0, offsetof(CPULM32State, breakpoints));
+}
+