/* Unicorn Emulator Engine */
/* By Nguyen Anh Quynh <aquynh@gmail.com>, 2015 */

#include "hw/boards.h"
#include "hw/arm/arm.h"
#include "sysemu/cpus.h"
#include "unicorn.h"
#include "cpu.h"
#include "unicorn_common.h"
#include "uc_priv.h"


static void arm_set_pc(struct uc_struct *uc, uint64_t address)
{
    ((CPUARMState *)uc->current_cpu->env_ptr)->pc = address;
    ((CPUARMState *)uc->current_cpu->env_ptr)->regs[15] = address;
}

void arm_reg_reset(struct uc_struct *uc)
{
    (void)uc;
    CPUArchState *env;

    env = first_cpu->env_ptr;
    memset(env->regs, 0, sizeof(env->regs));

    env->pc = 0;
}

int arm_reg_read(struct uc_struct *uc, unsigned int regid, void *value)
{
    CPUState *mycpu;

    mycpu = first_cpu;

    if (regid >= UC_ARM_REG_R0 && regid <= UC_ARM_REG_R12)
        *(int32_t *)value = ARM_CPU(uc, mycpu)->env.regs[regid - UC_ARM_REG_R0];
    else {
        switch(regid) {
            case UC_ARM_REG_CPSR:
                *(int32_t *)value = cpsr_read(&ARM_CPU(uc, mycpu)->env);
                break;
            //case UC_ARM_REG_SP:
            case UC_ARM_REG_R13:
                *(int32_t *)value = ARM_CPU(uc, mycpu)->env.regs[13];
                break;
            //case UC_ARM_REG_LR:
            case UC_ARM_REG_R14:
                *(int32_t *)value = ARM_CPU(uc, mycpu)->env.regs[14];
                break;
            //case UC_ARM_REG_PC:
            case UC_ARM_REG_R15:
                *(int32_t *)value = ARM_CPU(uc, mycpu)->env.regs[15];
                break;
        }
    }

    return 0;
}

int arm_reg_write(struct uc_struct *uc, unsigned int regid, const void *value)
{
    CPUState *mycpu = first_cpu;

    if (regid >= UC_ARM_REG_R0 && regid <= UC_ARM_REG_R12)
        ARM_CPU(uc, mycpu)->env.regs[regid - UC_ARM_REG_R0] = *(uint32_t *)value;
    else {
        switch(regid) {
            //case UC_ARM_REG_SP:
            case UC_ARM_REG_R13:
                ARM_CPU(uc, mycpu)->env.regs[13] = *(uint32_t *)value;
                break;
            //case UC_ARM_REG_LR:
            case UC_ARM_REG_R14:
                ARM_CPU(uc, mycpu)->env.regs[14] = *(uint32_t *)value;
                break;
            //case UC_ARM_REG_PC:
            case UC_ARM_REG_R15:
                ARM_CPU(uc, mycpu)->env.pc = *(uint32_t *)value;
                ARM_CPU(uc, mycpu)->env.regs[15] = *(uint32_t *)value;
                // force to quit execution and flush TB
                uc->quit_request = true;
                uc_emu_stop(uc);

                break;
        }
    }

    return 0;
}

static bool arm_stop_interrupt(int intno)
{
    switch(intno) {
        default:
            return false;
        case EXCP_UDEF:
            return true;
    }
}

static uc_err arm_query(struct uc_struct *uc, uc_query_type type, size_t *result)
{
    CPUState *mycpu = first_cpu;
    uint32_t mode;

    switch(type) {
        case UC_QUERY_MODE:
            // zero out ARM/THUMB mode
            mode = uc->mode & ~(UC_MODE_ARM | UC_MODE_THUMB);
            // THUMB mode or ARM MOde
            mode += ((ARM_CPU(uc, mycpu)->env.thumb != 0)? UC_MODE_THUMB : UC_MODE_ARM);
            *result = mode;
            return UC_ERR_OK;
        default:
            return UC_ERR_ARG;
    }
}

void arm_uc_init(struct uc_struct* uc)
{
    register_accel_types(uc);
    arm_cpu_register_types(uc);
    tosa_machine_init(uc);
    uc->reg_read = arm_reg_read;
    uc->reg_write = arm_reg_write;
    uc->reg_reset = arm_reg_reset;
    uc->set_pc = arm_set_pc;
    uc->stop_interrupt = arm_stop_interrupt;
    uc->query = arm_query;
    uc_common_init(uc);
}