/*
 * ARM gdb server stub: AArch64 specific functions.
 *
 * Copyright (c) 2013 SUSE LINUX Products GmbH
 *
 * 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 2.1 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 "qemu/osdep.h"
#include "qemu/log.h"
#include "cpu.h"
#include "internals.h"
#include "exec/gdbstub.h"

int aarch64_cpu_gdb_read_register(CPUState *cs, GByteArray *mem_buf, int n)
{
    ARMCPU *cpu = ARM_CPU(cs);
    CPUARMState *env = &cpu->env;

    if (n < 31) {
        /* Core integer register.  */
        return gdb_get_reg64(mem_buf, env->xregs[n]);
    }
    switch (n) {
    case 31:
        return gdb_get_reg64(mem_buf, env->xregs[31]);
    case 32:
        return gdb_get_reg64(mem_buf, env->pc);
    case 33:
        return gdb_get_reg32(mem_buf, pstate_read(env));
    }
    /* Unknown register.  */
    return 0;
}

int aarch64_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
{
    ARMCPU *cpu = ARM_CPU(cs);
    CPUARMState *env = &cpu->env;
    uint64_t tmp;

    tmp = ldq_p(mem_buf);

    if (n < 31) {
        /* Core integer register.  */
        env->xregs[n] = tmp;
        return 8;
    }
    switch (n) {
    case 31:
        env->xregs[31] = tmp;
        return 8;
    case 32:
        env->pc = tmp;
        return 8;
    case 33:
        /* CPSR */
        pstate_write(env, tmp);
        return 4;
    }
    /* Unknown register.  */
    return 0;
}

int aarch64_fpu_gdb_get_reg(CPUARMState *env, GByteArray *buf, int reg)
{
    switch (reg) {
    case 0 ... 31:
    {
        /* 128 bit FP register - quads are in LE order */
        uint64_t *q = aa64_vfp_qreg(env, reg);
        return gdb_get_reg128(buf, q[1], q[0]);
    }
    case 32:
        /* FPSR */
        return gdb_get_reg32(buf, vfp_get_fpsr(env));
    case 33:
        /* FPCR */
        return gdb_get_reg32(buf, vfp_get_fpcr(env));
    default:
        return 0;
    }
}

int aarch64_fpu_gdb_set_reg(CPUARMState *env, uint8_t *buf, int reg)
{
    switch (reg) {
    case 0 ... 31:
        /* 128 bit FP register */
        {
            uint64_t *q = aa64_vfp_qreg(env, reg);

            /*
             * On the wire these are target-endian 128 bit values.
             * In the CPU state these are host-order uint64_t values
             * with the least-significant one first. This means they're
             * the other way around for target_words_bigendian() (which is
             * only true for us for aarch64_be-linux-user).
             */
            if (target_words_bigendian()) {
                q[1] = ldq_p(buf);
                q[0] = ldq_p(buf + 8);
            } else{
                q[0] = ldq_p(buf);
                q[1] = ldq_p(buf + 8);
            }

            return 16;
        }
    case 32:
        /* FPSR */
        vfp_set_fpsr(env, ldl_p(buf));
        return 4;
    case 33:
        /* FPCR */
        vfp_set_fpcr(env, ldl_p(buf));
        return 4;
    default:
        return 0;
    }
}

int arm_gdb_get_svereg(CPUARMState *env, GByteArray *buf, int reg)
{
    ARMCPU *cpu = env_archcpu(env);

    switch (reg) {
    /* The first 32 registers are the zregs */
    case 0 ... 31:
    {
        int vq, len = 0;
        for (vq = 0; vq < cpu->sve_max_vq; vq++) {
            len += gdb_get_reg128(buf,
                                  env->vfp.zregs[reg].d[vq * 2 + 1],
                                  env->vfp.zregs[reg].d[vq * 2]);
        }
        return len;
    }
    case 32:
        return gdb_get_reg32(buf, vfp_get_fpsr(env));
    case 33:
        return gdb_get_reg32(buf, vfp_get_fpcr(env));
    /* then 16 predicates and the ffr */
    case 34 ... 50:
    {
        int preg = reg - 34;
        int vq, len = 0;
        for (vq = 0; vq < cpu->sve_max_vq; vq = vq + 4) {
            len += gdb_get_reg64(buf, env->vfp.pregs[preg].p[vq / 4]);
        }
        return len;
    }
    case 51:
    {
        /*
         * We report in Vector Granules (VG) which is 64bit in a Z reg
         * while the ZCR works in Vector Quads (VQ) which is 128bit chunks.
         */
        int vq = sve_vqm1_for_el(env, arm_current_el(env)) + 1;
        return gdb_get_reg64(buf, vq * 2);
    }
    default:
        /* gdbstub asked for something out our range */
        qemu_log_mask(LOG_UNIMP, "%s: out of range register %d", __func__, reg);
        break;
    }

    return 0;
}

int arm_gdb_set_svereg(CPUARMState *env, uint8_t *buf, int reg)
{
    ARMCPU *cpu = env_archcpu(env);

    /* The first 32 registers are the zregs */
    switch (reg) {
    /* The first 32 registers are the zregs */
    case 0 ... 31:
    {
        int vq, len = 0;
        for (vq = 0; vq < cpu->sve_max_vq; vq++) {
            if (target_words_bigendian()) {
                env->vfp.zregs[reg].d[vq * 2 + 1] = ldq_p(buf);
                buf += 8;
                env->vfp.zregs[reg].d[vq * 2] = ldq_p(buf);
            } else{
                env->vfp.zregs[reg].d[vq * 2] = ldq_p(buf);
                buf += 8;
                env->vfp.zregs[reg].d[vq * 2 + 1] = ldq_p(buf);
            }
            buf += 8;
            len += 16;
        }
        return len;
    }
    case 32:
        vfp_set_fpsr(env, *(uint32_t *)buf);
        return 4;
    case 33:
        vfp_set_fpcr(env, *(uint32_t *)buf);
        return 4;
    case 34 ... 50:
    {
        int preg = reg - 34;
        int vq, len = 0;
        for (vq = 0; vq < cpu->sve_max_vq; vq = vq + 4) {
            env->vfp.pregs[preg].p[vq / 4] = ldq_p(buf);
            buf += 8;
            len += 8;
        }
        return len;
    }
    case 51:
        /* cannot set vg via gdbstub */
        return 0;
    default:
        /* gdbstub asked for something out our range */
        break;
    }

    return 0;
}
