translate.c

   1 /*
   2  *  Host code generation
   3  *
   4  *  Copyright (c) 2003 Fabrice Bellard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20 #include <stdarg.h>
  21 #include <stdlib.h>
  22 #include <stdio.h>
  23 #include <string.h>
  24 #include <inttypes.h>
  25
  26 #include "config.h"
  27 #define IN_OP_I386
  28 #include "cpu-" TARGET_ARCH ".h"
  29 #include "exec.h"
  30 #include "disas.h"
  31
  32 enum {
  33 #define DEF(s, n, copy_size) INDEX_op_ ## s,
  34 #include "opc-" TARGET_ARCH ".h"
  35 #undef DEF
  36     NB_OPS,
  37 };
  38
  39 #include "dyngen.h"
  40 #include "op-" TARGET_ARCH ".h"
  41
  42 uint16_t gen_opc_buf[OPC_BUF_SIZE];
  43 uint32_t gen_opparam_buf[OPPARAM_BUF_SIZE];
  44 uint32_t gen_opc_pc[OPC_BUF_SIZE];
  45 uint8_t gen_opc_instr_start[OPC_BUF_SIZE];
  46
  47
  48 #ifdef DEBUG_DISAS
  49 static const char *op_str[] = {
  50 #define DEF(s, n, copy_size) #s,
  51 #include "opc-" TARGET_ARCH ".h"
  52 #undef DEF
  53 };
  54
  55 static uint8_t op_nb_args[] = {
  56 #define DEF(s, n, copy_size) n,
  57 #include "opc-" TARGET_ARCH ".h"
  58 #undef DEF
  59 };
  60
  61 void dump_ops(const uint16_t *opc_buf, const uint32_t *opparam_buf)
  62 {
  63     const uint16_t *opc_ptr;
  64     const uint32_t *opparam_ptr;
  65     int c, n, i;
  66
  67     opc_ptr = opc_buf;
  68     opparam_ptr = opparam_buf;
  69     for(;;) {
  70         c = *opc_ptr++;
  71         n = op_nb_args[c];
  72         fprintf(logfile, "0x%04x: %s",
  73                 (int)(opc_ptr - opc_buf - 1), op_str[c]);
  74         for(i = 0; i < n; i++) {
  75             fprintf(logfile, " 0x%x", opparam_ptr[i]);
  76         }
  77         fprintf(logfile, "\n");
  78         if (c == INDEX_op_end)
  79             break;
  80         opparam_ptr += n;
  81     }
  82 }
  83
  84 #endif
  85
  86 /* return non zero if the very first instruction is invalid so that
  87    the virtual CPU can trigger an exception.
  88
  89    '*gen_code_size_ptr' contains the size of the generated code (host
  90    code).
  91 */
  92 int cpu_gen_code(TranslationBlock *tb,
  93                  int max_code_size, int *gen_code_size_ptr)
  94 {
  95     uint8_t *gen_code_buf;
  96     int gen_code_size;
  97
  98     if (gen_intermediate_code(tb, 0) < 0)
  99         return -1;
 100
 101     /* generate machine code */
 102     tb->tb_next_offset[0] = 0xffff;
 103     tb->tb_next_offset[1] = 0xffff;
 104     gen_code_buf = tb->tc_ptr;
 105     gen_code_size = dyngen_code(gen_code_buf, tb->tb_next_offset,
 106 #ifdef USE_DIRECT_JUMP
 107                                 tb->tb_jmp_offset,
 108 #else
 109                                 NULL,
 110 #endif
 111                                 gen_opc_buf, gen_opparam_buf);
 112     *gen_code_size_ptr = gen_code_size;
 113 #ifdef DEBUG_DISAS
 114     if (loglevel) {
 115         fprintf(logfile, "OUT: [size=%d]\n", *gen_code_size_ptr);
 116         disas(logfile, gen_code_buf, *gen_code_size_ptr, 1, 0);
 117         fprintf(logfile, "\n");
 118         fflush(logfile);
 119     }
 120 #endif
 121     return 0;
 122 }
 123
 124 static const unsigned short opc_copy_size[] = {
 125 #define DEF(s, n, copy_size) copy_size,
 126 #include "opc-i386.h"
 127 #undef DEF
 128 };
 129
 130 /* The simulated PC corresponding to
 131    'searched_pc' in the generated code is searched. 0 is returned if
 132    found. *found_pc contains the found PC.
 133  */
 134 int cpu_search_pc(TranslationBlock *tb,
 135                   uint32_t *found_pc, unsigned long searched_pc)
 136 {
 137     int j, c;
 138     unsigned long tc_ptr;
 139     uint16_t *opc_ptr;
 140
 141     if (gen_intermediate_code(tb, 1) < 0)
 142         return -1;
 143
 144     /* find opc index corresponding to search_pc */
 145     tc_ptr = (unsigned long)tb->tc_ptr;
 146     if (searched_pc < tc_ptr)
 147         return -1;
 148     j = 0;
 149     opc_ptr = gen_opc_buf;
 150     for(;;) {
 151         c = *opc_ptr;
 152         if (c == INDEX_op_end)
 153             return -1;
 154         tc_ptr += opc_copy_size[c];
 155         if (searched_pc < tc_ptr)
 156             break;
 157         opc_ptr++;
 158     }
 159     j = opc_ptr - gen_opc_buf;
 160     /* now find start of instruction before */
 161     while (gen_opc_instr_start[j] == 0)
 162         j--;
 163     *found_pc = gen_opc_pc[j];
 164     return 0;
 165 }
 166
 167