Archipelago » qemu

/*

 * Xtensa gdb server stub

 *

 * Copyright (c) 2003-2005 Fabrice Bellard

 * 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 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 "config.h"

#include "qemu-common.h"

#include "exec/gdbstub.h"

int xtensa_cpu_gdb_read_register(CPUState *cs, uint8_t *mem_buf, int n)

{

    XtensaCPU *cpu = XTENSA_CPU(cs);

    CPUXtensaState *env = &cpu->env;

    const XtensaGdbReg *reg = env->config->gdb_regmap.reg + n;

    if (n < 0 || n >= env->config->gdb_regmap.num_regs) {

        return 0;

    }

    switch (reg->type) {

    case 9: /*pc*/

        return gdb_get_reg32(mem_buf, env->pc);

    case 1: /*ar*/

        xtensa_sync_phys_from_window(env);

        return gdb_get_reg32(mem_buf, env->phys_regs[(reg->targno & 0xff)

                                                     % env->config->nareg]);

    case 2: /*SR*/

        return gdb_get_reg32(mem_buf, env->sregs[reg->targno & 0xff]);

    case 3: /*UR*/

        return gdb_get_reg32(mem_buf, env->uregs[reg->targno & 0xff]);

    case 4: /*f*/

        return gdb_get_reg32(mem_buf, float32_val(env->fregs[reg->targno

                                                             & 0x0f]));

    case 8: /*a*/

        return gdb_get_reg32(mem_buf, env->regs[reg->targno & 0x0f]);

    default:

        qemu_log("%s from reg %d of unsupported type %d\n",

                 __func__, n, reg->type);

        return 0;

    }

}

int xtensa_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)

{

    XtensaCPU *cpu = XTENSA_CPU(cs);

    CPUXtensaState *env = &cpu->env;

    uint32_t tmp;

    const XtensaGdbReg *reg = env->config->gdb_regmap.reg + n;

    if (n < 0 || n >= env->config->gdb_regmap.num_regs) {

        return 0;

    }

    tmp = ldl_p(mem_buf);

    switch (reg->type) {

    case 9: /*pc*/

        env->pc = tmp;

        break;

    case 1: /*ar*/

        env->phys_regs[(reg->targno & 0xff) % env->config->nareg] = tmp;

        xtensa_sync_window_from_phys(env);

        break;

    case 2: /*SR*/

        env->sregs[reg->targno & 0xff] = tmp;

        break;

    case 3: /*UR*/

        env->uregs[reg->targno & 0xff] = tmp;

        break;

    case 4: /*f*/

        env->fregs[reg->targno & 0x0f] = make_float32(tmp);

        break;

    case 8: /*a*/

        env->regs[reg->targno & 0x0f] = tmp;

        break;

    default:

        qemu_log("%s to reg %d of unsupported type %d\n",

                 __func__, n, reg->type);

        return 0;

    }

    return 4;

}