translate-all.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., 51 Franklin Street, Fifth Floor, Boston MA  02110-1301 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
  28 #define NO_CPU_IO_DEFS
  29 #include "cpu.h"
  30 #include "exec-all.h"
  31 #include "disas.h"
  32 #include "tcg.h"
  33
  34 /* code generation context */
  35 TCGContext tcg_ctx;
  36
  37 uint16_t gen_opc_buf[OPC_BUF_SIZE];
  38 TCGArg gen_opparam_buf[OPPARAM_BUF_SIZE];
  39
  40 target_ulong gen_opc_pc[OPC_BUF_SIZE];
  41 uint16_t gen_opc_icount[OPC_BUF_SIZE];
  42 uint8_t gen_opc_instr_start[OPC_BUF_SIZE];
  43 #if defined(TARGET_I386)
  44 uint8_t gen_opc_cc_op[OPC_BUF_SIZE];
  45 #elif defined(TARGET_SPARC)
  46 target_ulong gen_opc_npc[OPC_BUF_SIZE];
  47 target_ulong gen_opc_jump_pc[2];
  48 #elif defined(TARGET_MIPS) || defined(TARGET_SH4)
  49 uint32_t gen_opc_hflags[OPC_BUF_SIZE];
  50 #endif
  51
  52 /* XXX: suppress that */
  53 unsigned long code_gen_max_block_size(void)
  54 {
  55     static unsigned long max;
  56
  57     if (max == 0) {
  58         max = TCG_MAX_OP_SIZE;
  59 #define DEF(s, n, copy_size) max = copy_size > max? copy_size : max;
  60 #include "tcg-opc.h"
  61 #undef DEF
  62         max *= OPC_MAX_SIZE;
  63     }
  64
  65     return max;
  66 }
  67
  68 void cpu_gen_init(void)
  69 {
  70     tcg_context_init(&tcg_ctx);
  71     tcg_set_frame(&tcg_ctx, TCG_AREG0, offsetof(CPUState, temp_buf),
  72                   CPU_TEMP_BUF_NLONGS * sizeof(long));
  73 }
  74
  75 /* return non zero if the very first instruction is invalid so that
  76    the virtual CPU can trigger an exception.
  77
  78    '*gen_code_size_ptr' contains the size of the generated code (host
  79    code).
  80 */
  81 int cpu_gen_code(CPUState *env, TranslationBlock *tb, int *gen_code_size_ptr)
  82 {
  83     TCGContext *s = &tcg_ctx;
  84     uint8_t *gen_code_buf;
  85     int gen_code_size;
  86 #ifdef CONFIG_PROFILER
  87     int64_t ti;
  88 #endif
  89
  90 #ifdef CONFIG_PROFILER
  91     s->tb_count1++; /* includes aborted translations because of
  92                        exceptions */
  93     ti = profile_getclock();
  94 #endif
  95     tcg_func_start(s);
  96
  97     gen_intermediate_code(env, tb);
  98
  99     /* generate machine code */
 100     gen_code_buf = tb->tc_ptr;
 101     tb->tb_next_offset[0] = 0xffff;
 102     tb->tb_next_offset[1] = 0xffff;
 103     s->tb_next_offset = tb->tb_next_offset;
 104 #ifdef USE_DIRECT_JUMP
 105     s->tb_jmp_offset = tb->tb_jmp_offset;
 106     s->tb_next = NULL;
 107     /* the following two entries are optional (only used for string ops) */
 108     /* XXX: not used ? */
 109     tb->tb_jmp_offset[2] = 0xffff;
 110     tb->tb_jmp_offset[3] = 0xffff;
 111 #else
 112     s->tb_jmp_offset = NULL;
 113     s->tb_next = tb->tb_next;
 114 #endif
 115
 116 #ifdef CONFIG_PROFILER
 117     s->tb_count++;
 118     s->interm_time += profile_getclock() - ti;
 119     s->code_time -= profile_getclock();
 120 #endif
 121     gen_code_size = tcg_gen_code(s, gen_code_buf);
 122     *gen_code_size_ptr = gen_code_size;
 123 #ifdef CONFIG_PROFILER
 124     s->code_time += profile_getclock();
 125     s->code_in_len += tb->size;
 126     s->code_out_len += gen_code_size;
 127 #endif
 128
 129 #ifdef DEBUG_DISAS
 130     if (qemu_loglevel_mask(CPU_LOG_TB_OUT_ASM)) {
 131         qemu_log("OUT: [size=%d]\n", *gen_code_size_ptr);
 132         log_disas(tb->tc_ptr, *gen_code_size_ptr);
 133         qemu_log("\n");
 134         qemu_log_flush();
 135     }
 136 #endif
 137     return 0;
 138 }
 139
 140 /* The cpu state corresponding to 'searched_pc' is restored.
 141  */
 142 int cpu_restore_state(TranslationBlock *tb,
 143                       CPUState *env, unsigned long searched_pc,
 144                       void *puc)
 145 {
 146     TCGContext *s = &tcg_ctx;
 147     int j;
 148     unsigned long tc_ptr;
 149 #ifdef CONFIG_PROFILER
 150     int64_t ti;
 151 #endif
 152
 153 #ifdef CONFIG_PROFILER
 154     ti = profile_getclock();
 155 #endif
 156     tcg_func_start(s);
 157
 158     gen_intermediate_code_pc(env, tb);
 159
 160     if (use_icount) {
 161         /* Reset the cycle counter to the start of the block.  */
 162         env->icount_decr.u16.low += tb->icount;
 163         /* Clear the IO flag.  */
 164         env->can_do_io = 0;
 165     }
 166
 167     /* find opc index corresponding to search_pc */
 168     tc_ptr = (unsigned long)tb->tc_ptr;
 169     if (searched_pc < tc_ptr)
 170         return -1;
 171
 172     s->tb_next_offset = tb->tb_next_offset;
 173 #ifdef USE_DIRECT_JUMP
 174     s->tb_jmp_offset = tb->tb_jmp_offset;
 175     s->tb_next = NULL;
 176 #else
 177     s->tb_jmp_offset = NULL;
 178     s->tb_next = tb->tb_next;
 179 #endif
 180     j = tcg_gen_code_search_pc(s, (uint8_t *)tc_ptr, searched_pc - tc_ptr);
 181     if (j < 0)
 182         return -1;
 183     /* now find start of instruction before */
 184     while (gen_opc_instr_start[j] == 0)
 185         j--;
 186     env->icount_decr.u16.low -= gen_opc_icount[j];
 187
 188     gen_pc_load(env, tb, searched_pc, j, puc);
 189
 190 #ifdef CONFIG_PROFILER
 191     s->restore_time += profile_getclock() - ti;
 192     s->restore_count++;
 193 #endif
 194     return 0;
 195 }