Archipelago » qemu

/*

 *  Host code generation

 * 

 *  Copyright (c) 2003 Fabrice Bellard

 *

 * 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, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 */

#include <stdarg.h>

#include <stdlib.h>

#include <stdio.h>

#include <string.h>

#include <inttypes.h>

#include "config.h"

#define IN_OP_I386

#if defined(TARGET_I386)

#include "cpu-i386.h"

#define OPC_CPU_H "opc-i386.h"

#elif defined(TARGET_ARM)

#include "cpu-arm.h"

#define OPC_CPU_H "opc-arm.h"

#else

#error unsupported target CPU

#endif

#include "exec.h"

#include "disas.h"

enum {

#define DEF(s, n, copy_size) INDEX_op_ ## s,

#include OPC_CPU_H

#undef DEF

    NB_OPS,

};

#include "dyngen.h"

#if defined(TARGET_I386)

#include "op-i386.h"

#elif defined(TARGET_ARM)

#include "op-arm.h"

#else

#error unsupported target CPU

#endif

uint16_t gen_opc_buf[OPC_BUF_SIZE];

uint32_t gen_opparam_buf[OPPARAM_BUF_SIZE];

uint32_t gen_opc_pc[OPC_BUF_SIZE];

uint8_t gen_opc_instr_start[OPC_BUF_SIZE];

#if defined(TARGET_I386)

uint8_t gen_opc_cc_op[OPC_BUF_SIZE];

#endif

#ifdef DEBUG_DISAS

static const char *op_str[] = {

#define DEF(s, n, copy_size) #s,

#include OPC_CPU_H

#undef DEF

};

static uint8_t op_nb_args[] = {

#define DEF(s, n, copy_size) n,

#include OPC_CPU_H

#undef DEF

};

void dump_ops(const uint16_t *opc_buf, const uint32_t *opparam_buf)

{

    const uint16_t *opc_ptr;

    const uint32_t *opparam_ptr;

    int c, n, i;

    opc_ptr = opc_buf;

    opparam_ptr = opparam_buf;

    for(;;) {

        c = *opc_ptr++;

        n = op_nb_args[c];

        fprintf(logfile, "0x%04x: %s", 

                (int)(opc_ptr - opc_buf - 1), op_str[c]);

        for(i = 0; i < n; i++) {

            fprintf(logfile, " 0x%x", opparam_ptr[i]);

        }

        fprintf(logfile, "\n");

        if (c == INDEX_op_end)

            break;

        opparam_ptr += n;

    }

}

#endif

/* return non zero if the very first instruction is invalid so that

   the virtual CPU can trigger an exception. 

   '*gen_code_size_ptr' contains the size of the generated code (host

   code).

*/

int cpu_gen_code(CPUState *env, TranslationBlock *tb,

                 int max_code_size, int *gen_code_size_ptr)

{

    uint8_t *gen_code_buf;

    int gen_code_size;

    if (gen_intermediate_code(env, tb) < 0)

        return -1;

    /* generate machine code */

    tb->tb_next_offset[0] = 0xffff;

    tb->tb_next_offset[1] = 0xffff;

    gen_code_buf = tb->tc_ptr;

#ifdef USE_DIRECT_JUMP

    /* the following two entries are optional (only used for string ops) */

    tb->tb_jmp_offset[2] = 0xffff;

    tb->tb_jmp_offset[3] = 0xffff;

#endif

    gen_code_size = dyngen_code(gen_code_buf, tb->tb_next_offset,

#ifdef USE_DIRECT_JUMP

                                tb->tb_jmp_offset,

#else

                                NULL,

#endif

                                gen_opc_buf, gen_opparam_buf);

    *gen_code_size_ptr = gen_code_size;

#ifdef DEBUG_DISAS

    if (loglevel) {

        fprintf(logfile, "OUT: [size=%d]\n", *gen_code_size_ptr);

        disas(logfile, gen_code_buf, *gen_code_size_ptr, 1, 0);

        fprintf(logfile, "\n");

        fflush(logfile);

    }

#endif

    return 0;

}

static const unsigned short opc_copy_size[] = {

#define DEF(s, n, copy_size) copy_size,

#include OPC_CPU_H

#undef DEF

};

/* The cpu state corresponding to 'searched_pc' is restored. 

 */

int cpu_restore_state(TranslationBlock *tb, 

                      CPUState *env, unsigned long searched_pc)

{

    int j, c;

    unsigned long tc_ptr;

    uint16_t *opc_ptr;

    if (gen_intermediate_code_pc(env, tb) < 0)

        return -1;

    /* find opc index corresponding to search_pc */

    tc_ptr = (unsigned long)tb->tc_ptr;

    if (searched_pc < tc_ptr)

        return -1;

    j = 0;

    opc_ptr = gen_opc_buf;

    for(;;) {

        c = *opc_ptr;

        if (c == INDEX_op_end)

            return -1;

        tc_ptr += opc_copy_size[c];

        if (searched_pc < tc_ptr)

            break;

        opc_ptr++;

    }

    j = opc_ptr - gen_opc_buf;

    /* now find start of instruction before */

    while (gen_opc_instr_start[j] == 0)

        j--;

#if defined(TARGET_I386)

    {

        int cc_op;

#ifdef DEBUG_DISAS

        if (loglevel) {

            int i;

            fprintf(logfile, "RESTORE:\n");

            for(i=0;i<=j; i++) {

                if (gen_opc_instr_start[i]) {

                    fprintf(logfile, "0x%04x: 0x%08x\n", i, gen_opc_pc[i]);

                }

            }

            fprintf(logfile, "spc=0x%08lx j=0x%x eip=0x%lx cs_base=%lx\n", 

                    searched_pc, j, gen_opc_pc[j] - tb->cs_base, tb->cs_base);

        }

#endif

        env->eip = gen_opc_pc[j] - tb->cs_base;

        cc_op = gen_opc_cc_op[j];

        if (cc_op != CC_OP_DYNAMIC)

            env->cc_op = cc_op;

    }

#elif defined(TARGET_ARM)

    env->regs[15] = gen_opc_pc[j];

#endif

    return 0;

}