/*
 *  AArch64 translation
 *
 *  Copyright (c) 2013 Alexander Graf <agraf@suse.de>
 *
 * 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 <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <inttypes.h>

#include "cpu.h"
#include "tcg-op.h"
#include "qemu/log.h"
#include "translate.h"
#include "qemu/host-utils.h"

#include "helper.h"
#define GEN_HELPER 1
#include "helper.h"

static TCGv_i64 cpu_X[32];
static TCGv_i64 cpu_pc;
static TCGv_i32 pstate;

static const char *regnames[] = {
    "x0", "x1", "x2", "x3", "x4", "x5", "x6", "x7",
    "x8", "x9", "x10", "x11", "x12", "x13", "x14", "x15",
    "x16", "x17", "x18", "x19", "x20", "x21", "x22", "x23",
    "x24", "x25", "x26", "x27", "x28", "x29", "lr", "sp"
};

/* initialize TCG globals.  */
void a64_translate_init(void)
{
    int i;

    cpu_pc = tcg_global_mem_new_i64(TCG_AREG0,
                                    offsetof(CPUARMState, pc),
                                    "pc");
    for (i = 0; i < 32; i++) {
        cpu_X[i] = tcg_global_mem_new_i64(TCG_AREG0,
                                          offsetof(CPUARMState, xregs[i]),
                                          regnames[i]);
    }

    pstate = tcg_global_mem_new_i32(TCG_AREG0,
                                    offsetof(CPUARMState, pstate),
                                    "pstate");
}

void aarch64_cpu_dump_state(CPUState *cs, FILE *f,
                            fprintf_function cpu_fprintf, int flags)
{
    ARMCPU *cpu = ARM_CPU(cs);
    CPUARMState *env = &cpu->env;
    int i;

    cpu_fprintf(f, "PC=%016"PRIx64"  SP=%016"PRIx64"\n",
            env->pc, env->xregs[31]);
    for (i = 0; i < 31; i++) {
        cpu_fprintf(f, "X%02d=%016"PRIx64, i, env->xregs[i]);
        if ((i % 4) == 3) {
            cpu_fprintf(f, "\n");
        } else {
            cpu_fprintf(f, " ");
        }
    }
    cpu_fprintf(f, "PSTATE=%c%c%c%c\n",
        env->pstate & PSTATE_N ? 'n' : '.',
        env->pstate & PSTATE_Z ? 'z' : '.',
        env->pstate & PSTATE_C ? 'c' : '.',
        env->pstate & PSTATE_V ? 'v' : '.');
    cpu_fprintf(f, "\n");
}

void gen_a64_set_pc_im(uint64_t val)
{
    tcg_gen_movi_i64(cpu_pc, val);
}

static void gen_exception(int excp)
{
    TCGv_i32 tmp = tcg_temp_new_i32();
    tcg_gen_movi_i32(tmp, excp);
    gen_helper_exception(cpu_env, tmp);
    tcg_temp_free_i32(tmp);
}

static void gen_exception_insn(DisasContext *s, int offset, int excp)
{
    gen_a64_set_pc_im(s->pc - offset);
    gen_exception(excp);
    s->is_jmp = DISAS_JUMP;
}

static void real_unallocated_encoding(DisasContext *s)
{
    fprintf(stderr, "Unknown instruction: %#x\n", s->insn);
    gen_exception_insn(s, 4, EXCP_UDEF);
}

#define unallocated_encoding(s) do { \
    fprintf(stderr, "unallocated encoding at line: %d\n", __LINE__); \
    real_unallocated_encoding(s); \
    } while (0)

void disas_a64_insn(CPUARMState *env, DisasContext *s)
{
    uint32_t insn;

    insn = arm_ldl_code(env, s->pc, s->bswap_code);
    s->insn = insn;
    s->pc += 4;

    switch ((insn >> 24) & 0x1f) {
    default:
        unallocated_encoding(s);
        break;
    }

    if (unlikely(s->singlestep_enabled) && (s->is_jmp == DISAS_TB_JUMP)) {
        /* go through the main loop for single step */
        s->is_jmp = DISAS_JUMP;
    }
}