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_HPPA)
  49 target_ulong gen_opc_npc[OPC_BUF_SIZE];
  50 #elif defined(TARGET_MIPS) || defined(TARGET_SH4)
  51 uint32_t gen_opc_hflags[OPC_BUF_SIZE];
  52 #endif
  53
  54 /* XXX: suppress that */
  55 unsigned long code_gen_max_block_size(void)
  56 {
  57     static unsigned long max;
  58
  59     if (max == 0) {
  60         max = TCG_MAX_OP_SIZE;
  61 #define DEF(s, n, copy_size) max = copy_size > max? copy_size : max;
  62 #include "tcg-opc.h"
  63 #undef DEF
  64         max *= OPC_MAX_SIZE;
  65     }
  66
  67     return max;
  68 }
  69
  70 void cpu_gen_init(void)
  71 {
  72     tcg_context_init(&tcg_ctx);
  73     tcg_set_frame(&tcg_ctx, TCG_AREG0, offsetof(CPUState, temp_buf),
  74                   CPU_TEMP_BUF_NLONGS * sizeof(long));
  75 }
  76
  77 /* return non zero if the very first instruction is invalid so that
  78    the virtual CPU can trigger an exception.
  79
  80    '*gen_code_size_ptr' contains the size of the generated code (host
  81    code).
  82 */
  83 int cpu_gen_code(CPUState *env, TranslationBlock *tb, int *gen_code_size_ptr)
  84 {
  85     TCGContext *s = &tcg_ctx;
  86     uint8_t *gen_code_buf;
  87     int gen_code_size;
  88 #ifdef CONFIG_PROFILER
  89     int64_t ti;
  90 #endif
  91
  92 #ifdef CONFIG_PROFILER
  93     s->tb_count1++; /* includes aborted translations because of
  94                        exceptions */
  95     ti = profile_getclock();
  96 #endif
  97     tcg_func_start(s);
  98
  99     gen_intermediate_code(env, tb);
 100
 101     /* generate machine code */
 102     gen_code_buf = tb->tc_ptr;
 103     tb->tb_next_offset[0] = 0xffff;
 104     tb->tb_next_offset[1] = 0xffff;
 105     s->tb_next_offset = tb->tb_next_offset;
 106 #ifdef USE_DIRECT_JUMP
 107     s->tb_jmp_offset = tb->tb_jmp_offset;
 108     s->tb_next = NULL;
 109     /* the following two entries are optional (only used for string ops) */
 110     /* XXX: not used ? */
 111     tb->tb_jmp_offset[2] = 0xffff;
 112     tb->tb_jmp_offset[3] = 0xffff;
 113 #else
 114     s->tb_jmp_offset = NULL;
 115     s->tb_next = tb->tb_next;
 116 #endif
 117
 118 #ifdef CONFIG_PROFILER
 119     s->tb_count++;
 120     s->interm_time += profile_getclock() - ti;
 121     s->code_time -= profile_getclock();
 122 #endif
 123     gen_code_size = tcg_gen_code(s, gen_code_buf);
 124     *gen_code_size_ptr = gen_code_size;
 125 #ifdef CONFIG_PROFILER
 126     s->code_time += profile_getclock();
 127     s->code_in_len += tb->size;
 128     s->code_out_len += gen_code_size;
 129 #endif
 130
 131 #ifdef DEBUG_DISAS
 132     if (qemu_loglevel_mask(CPU_LOG_TB_OUT_ASM)) {
 133         qemu_log("OUT: [size=%d]\n", *gen_code_size_ptr);
 134         log_disas(tb->tc_ptr, *gen_code_size_ptr);
 135         qemu_log("\n");
 136         qemu_log_flush();
 137     }
 138 #endif
 139     return 0;
 140 }
 141
 142 /* The cpu state corresponding to 'searched_pc' is restored.
 143  */
 144 int cpu_restore_state(TranslationBlock *tb,
 145                       CPUState *env, unsigned long searched_pc,
 146                       void *puc)
 147 {
 148     TCGContext *s = &tcg_ctx;
 149     int j;
 150     unsigned long tc_ptr;
 151 #ifdef CONFIG_PROFILER
 152     int64_t ti;
 153 #endif
 154
 155 #ifdef CONFIG_PROFILER
 156     ti = profile_getclock();
 157 #endif
 158     tcg_func_start(s);
 159
 160     gen_intermediate_code_pc(env, tb);
 161
 162     if (use_icount) {
 163         /* Reset the cycle counter to the start of the block.  */
 164         env->icount_decr.u16.low += tb->icount;
 165         /* Clear the IO flag.  */
 166         env->can_do_io = 0;
 167     }
 168
 169     /* find opc index corresponding to search_pc */
 170     tc_ptr = (unsigned long)tb->tc_ptr;
 171     if (searched_pc < tc_ptr)
 172         return -1;
 173
 174     s->tb_next_offset = tb->tb_next_offset;
 175 #ifdef USE_DIRECT_JUMP
 176     s->tb_jmp_offset = tb->tb_jmp_offset;
 177     s->tb_next = NULL;
 178 #else
 179     s->tb_jmp_offset = NULL;
 180     s->tb_next = tb->tb_next;
 181 #endif
 182     j = tcg_gen_code_search_pc(s, (uint8_t *)tc_ptr, searched_pc - tc_ptr);
 183     if (j < 0)
 184         return -1;
 185     /* now find start of instruction before */
 186     while (gen_opc_instr_start[j] == 0)
 187         j--;
 188     env->icount_decr.u16.low -= gen_opc_icount[j];
 189
 190     gen_pc_load(env, tb, searched_pc, j, puc);
 191
 192 #ifdef CONFIG_PROFILER
 193     s->restore_time += profile_getclock() - ti;
 194     s->restore_count++;
 195 #endif
 196     return 0;
 197 }