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, see <http://www.gnu.org/licenses/>.

 */

#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"

#include "tcg.h"

#include "qemu-timer.h"

/* code generation context */

TCGContext tcg_ctx;

uint16_t gen_opc_buf[OPC_BUF_SIZE];

TCGArg gen_opparam_buf[OPPARAM_BUF_SIZE];

target_ulong gen_opc_pc[OPC_BUF_SIZE];

uint16_t gen_opc_icount[OPC_BUF_SIZE];

uint8_t gen_opc_instr_start[OPC_BUF_SIZE];

void cpu_gen_init(void)

{

    tcg_context_init(&tcg_ctx); 

    tcg_set_frame(&tcg_ctx, TCG_AREG0, offsetof(CPUState, temp_buf),

                  CPU_TEMP_BUF_NLONGS * sizeof(long));

}

/* 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 *gen_code_size_ptr)

{

    TCGContext *s = &tcg_ctx;

    uint8_t *gen_code_buf;

    int gen_code_size;

#ifdef CONFIG_PROFILER

    int64_t ti;

#endif

#ifdef CONFIG_PROFILER

    s->tb_count1++; /* includes aborted translations because of

                       exceptions */

    ti = profile_getclock();

#endif

    tcg_func_start(s);

    gen_intermediate_code(env, tb);

    /* generate machine code */

    gen_code_buf = tb->tc_ptr;

    tb->tb_next_offset[0] = 0xffff;

    tb->tb_next_offset[1] = 0xffff;

    s->tb_next_offset = tb->tb_next_offset;

#ifdef USE_DIRECT_JUMP

    s->tb_jmp_offset = tb->tb_jmp_offset;

    s->tb_next = NULL;

#else

    s->tb_jmp_offset = NULL;

    s->tb_next = tb->tb_next;

#endif

#ifdef CONFIG_PROFILER

    s->tb_count++;

    s->interm_time += profile_getclock() - ti;

    s->code_time -= profile_getclock();

#endif

    gen_code_size = tcg_gen_code(s, gen_code_buf);

    *gen_code_size_ptr = gen_code_size;

#ifdef CONFIG_PROFILER

    s->code_time += profile_getclock();

    s->code_in_len += tb->size;

    s->code_out_len += gen_code_size;

#endif

#ifdef DEBUG_DISAS

    if (qemu_loglevel_mask(CPU_LOG_TB_OUT_ASM)) {

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

        log_disas(tb->tc_ptr, *gen_code_size_ptr);

        qemu_log("\n");

        qemu_log_flush();

    }

#endif

    return 0;

}

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

 */

int cpu_restore_state(TranslationBlock *tb,

                      CPUState *env, unsigned long searched_pc)

{

    TCGContext *s = &tcg_ctx;

    int j;

    unsigned long tc_ptr;

#ifdef CONFIG_PROFILER

    int64_t ti;

#endif

#ifdef CONFIG_PROFILER

    ti = profile_getclock();

#endif

    tcg_func_start(s);

    gen_intermediate_code_pc(env, tb);

    if (use_icount) {

        /* Reset the cycle counter to the start of the block.  */

        env->icount_decr.u16.low += tb->icount;

        /* Clear the IO flag.  */

        env->can_do_io = 0;

    }

    /* find opc index corresponding to search_pc */

    tc_ptr = (unsigned long)tb->tc_ptr;

    if (searched_pc < tc_ptr)

        return -1;

    s->tb_next_offset = tb->tb_next_offset;

#ifdef USE_DIRECT_JUMP

    s->tb_jmp_offset = tb->tb_jmp_offset;

    s->tb_next = NULL;

#else

    s->tb_jmp_offset = NULL;

    s->tb_next = tb->tb_next;

#endif

    j = tcg_gen_code_search_pc(s, (uint8_t *)tc_ptr, searched_pc - tc_ptr);

    if (j < 0)

        return -1;

    /* now find start of instruction before */

    while (gen_opc_instr_start[j] == 0)

        j--;

    env->icount_decr.u16.low -= gen_opc_icount[j];

    restore_state_to_opc(env, tb, j);

#ifdef CONFIG_PROFILER

    s->restore_time += profile_getclock() - ti;

    s->restore_count++;

#endif

    return 0;

}