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 NO_CPU_IO_DEFS

#include "cpu.h"

#include "exec-all.h"

#include "disas.h"

extern int dyngen_code(uint8_t *gen_code_buf,

                       uint16_t *label_offsets, uint16_t *jmp_offsets,

                       const uint16_t *opc_buf, const uint32_t *opparam_buf, const long *gen_labels);

enum {

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

#include "opc.h"

#undef DEF

    NB_OPS,

};

uint16_t gen_opc_buf[OPC_BUF_SIZE];

uint32_t gen_opparam_buf[OPPARAM_BUF_SIZE];

long gen_labels[OPC_BUF_SIZE];

int nb_gen_labels;

target_ulong 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];

#elif defined(TARGET_SPARC)

target_ulong gen_opc_npc[OPC_BUF_SIZE];

target_ulong gen_opc_jump_pc[2];

#endif

int code_copy_enabled = 1;

#ifdef DEBUG_DISAS

static const char *op_str[] = {

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

#include "opc.h"

#undef DEF

};

static uint8_t op_nb_args[] = {

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

#include "opc.h"

#undef DEF

};

static const unsigned short opc_copy_size[] = {

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

#include "opc.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

/* compute label info */

static void dyngen_labels(long *gen_labels, int nb_gen_labels,

                          uint8_t *gen_code_buf, const uint16_t *opc_buf)

{

    uint8_t *gen_code_ptr;

    int c, i;

    unsigned long gen_code_addr[OPC_BUF_SIZE];

    if (nb_gen_labels == 0)

        return;

    /* compute the address of each op code */

    gen_code_ptr = gen_code_buf;

    i = 0;

    for(;;) {

        c = opc_buf[i];

        gen_code_addr[i] =(unsigned long)gen_code_ptr;

        if (c == INDEX_op_end)

            break;

        gen_code_ptr += opc_copy_size[c];

        i++;

    }

    /* compute the address of each label */

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

        gen_labels[i] = gen_code_addr[gen_labels[i]];

    }

}

/* 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;

#ifdef USE_CODE_COPY

    if (code_copy_enabled &&

        cpu_gen_code_copy(env, tb, max_code_size, &gen_code_size) == 0) {

        /* nothing more to do */

    } else

#endif

    {

        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

        dyngen_labels(gen_labels, nb_gen_labels, gen_code_buf, gen_opc_buf);

        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_labels);

    }

    *gen_code_size_ptr = gen_code_size;

#ifdef DEBUG_DISAS

    if (loglevel & CPU_LOG_TB_OUT_ASM) {

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

        disas(logfile, tb->tc_ptr, *gen_code_size_ptr);

        fprintf(logfile, "\n");

        fflush(logfile);

    }

#endif

    return 0;

}

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

 */

int cpu_restore_state(TranslationBlock *tb, 

                      CPUState *env, unsigned long searched_pc,

                      void *puc)

{

    int j, c;

    unsigned long tc_ptr;

    uint16_t *opc_ptr;

#ifdef USE_CODE_COPY

    if (tb->cflags & CF_CODE_COPY) {

        return cpu_restore_state_copy(tb, env, searched_pc, puc);

    }

#endif

    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 & CPU_LOG_TB_OP) {

            int i;

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

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

                if (gen_opc_instr_start[i]) {

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

                }

            }

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

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

                    (uint32_t)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];

#elif defined(TARGET_SPARC)

    {

        target_ulong npc;

        env->pc = gen_opc_pc[j];

        npc = gen_opc_npc[j];

        if (npc == 1) {

            /* dynamic NPC: already stored */

        } else if (npc == 2) {

            target_ulong t2 = (target_ulong)puc;

            /* jump PC: use T2 and the jump targets of the translation */

            if (t2) 

                env->npc = gen_opc_jump_pc[0];

            else

                env->npc = gen_opc_jump_pc[1];

        } else {

            env->npc = npc;

        }

    }

#elif defined(TARGET_PPC)

    {

        int type;

        /* for PPC, we need to look at the micro operation to get the

           access type */

        env->nip = gen_opc_pc[j];

        switch(c) {

#if defined(CONFIG_USER_ONLY)

#define CASE3(op)\

        case INDEX_op_ ## op ## _raw

#else

#define CASE3(op)\

        case INDEX_op_ ## op ## _user:\

        case INDEX_op_ ## op ## _kernel

#endif

        CASE3(stfd):

        CASE3(stfs):

        CASE3(lfd):

        CASE3(lfs):

            type = ACCESS_FLOAT;

            break;

        CASE3(lwarx):

            type = ACCESS_RES;

            break;

        CASE3(stwcx):

            type = ACCESS_RES;

            break;

        CASE3(eciwx):

        CASE3(ecowx):

            type = ACCESS_EXT;

            break;

        default:

            type = ACCESS_INT;

            break;

        }

        env->access_type = type;

    }

#elif defined(TARGET_MIPS)

    env->PC = gen_opc_pc[j];

#endif

    return 0;

}