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, see <http://www.gnu.org/licenses/>.
  18  */
  19 #include <stdarg.h>
  20 #include <stdlib.h>
  21 #include <stdio.h>
  22 #include <string.h>
  23 #include <inttypes.h>
  24
  25 #include "config.h"
  26
  27 #define NO_CPU_IO_DEFS
  28 #include "cpu.h"
  29 #include "exec-all.h"
  30 #include "disas.h"
  31 #include "tcg.h"
  32
  33 /* code generation context */
  34 TCGContext tcg_ctx;
  35
  36 uint16_t gen_opc_buf[OPC_BUF_SIZE];
  37 TCGArg gen_opparam_buf[OPPARAM_BUF_SIZE];
  38
  39 target_ulong gen_opc_pc[OPC_BUF_SIZE];
  40 uint16_t gen_opc_icount[OPC_BUF_SIZE];
  41 uint8_t gen_opc_instr_start[OPC_BUF_SIZE];
  42 #if defined(TARGET_I386)
  43 uint8_t gen_opc_cc_op[OPC_BUF_SIZE];
  44 #elif defined(TARGET_SPARC)
  45 target_ulong gen_opc_npc[OPC_BUF_SIZE];
  46 target_ulong gen_opc_jump_pc[2];
  47 #elif defined(TARGET_MIPS) || defined(TARGET_SH4)
  48 uint32_t gen_opc_hflags[OPC_BUF_SIZE];
  49 #endif
  50
  51 /* XXX: suppress that */
  52 unsigned long code_gen_max_block_size(void)
  53 {
  54     static unsigned long max;
  55
  56     if (max == 0) {
  57         max = TCG_MAX_OP_SIZE;
  58 #define DEF(s, n, copy_size) max = copy_size > max? copy_size : max;
  59 #include "tcg-opc.h"
  60 #undef DEF
  61         max *= OPC_MAX_SIZE;
  62     }
  63
  64     return max;
  65 }
  66
  67 void cpu_gen_init(void)
  68 {
  69     tcg_context_init(&tcg_ctx);
  70     tcg_set_frame(&tcg_ctx, TCG_AREG0, offsetof(CPUState, temp_buf),
  71                   CPU_TEMP_BUF_NLONGS * sizeof(long));
  72 }
  73
  74 /* return non zero if the very first instruction is invalid so that
  75    the virtual CPU can trigger an exception.
  76
  77    '*gen_code_size_ptr' contains the size of the generated code (host
  78    code).
  79 */
  80 int cpu_gen_code(CPUState *env, TranslationBlock *tb, int *gen_code_size_ptr)
  81 {
  82     TCGContext *s = &tcg_ctx;
  83     uint8_t *gen_code_buf;
  84     int gen_code_size;
  85 #ifdef CONFIG_PROFILER
  86     int64_t ti;
  87 #endif
  88
  89 #ifdef CONFIG_PROFILER
  90     s->tb_count1++; /* includes aborted translations because of
  91                        exceptions */
  92     ti = profile_getclock();
  93 #endif
  94     tcg_func_start(s);
  95
  96     gen_intermediate_code(env, tb);
  97
  98     /* generate machine code */
  99     gen_code_buf = tb->tc_ptr;
 100     tb->tb_next_offset[0] = 0xffff;
 101     tb->tb_next_offset[1] = 0xffff;
 102     s->tb_next_offset = tb->tb_next_offset;
 103 #ifdef USE_DIRECT_JUMP
 104     s->tb_jmp_offset = tb->tb_jmp_offset;
 105     s->tb_next = NULL;
 106     /* the following two entries are optional (only used for string ops) */
 107     /* XXX: not used ? */
 108     tb->tb_jmp_offset[2] = 0xffff;
 109     tb->tb_jmp_offset[3] = 0xffff;
 110 #else
 111     s->tb_jmp_offset = NULL;
 112     s->tb_next = tb->tb_next;
 113 #endif
 114
 115 #ifdef CONFIG_PROFILER
 116     s->tb_count++;
 117     s->interm_time += profile_getclock() - ti;
 118     s->code_time -= profile_getclock();
 119 #endif
 120     gen_code_size = tcg_gen_code(s, gen_code_buf);
 121     *gen_code_size_ptr = gen_code_size;
 122 #ifdef CONFIG_PROFILER
 123     s->code_time += profile_getclock();
 124     s->code_in_len += tb->size;
 125     s->code_out_len += gen_code_size;
 126 #endif
 127
 128 #ifdef DEBUG_DISAS
 129     if (qemu_loglevel_mask(CPU_LOG_TB_OUT_ASM)) {
 130         qemu_log("OUT: [size=%d]\n", *gen_code_size_ptr);
 131         log_disas(tb->tc_ptr, *gen_code_size_ptr);
 132         qemu_log("\n");
 133         qemu_log_flush();
 134     }
 135 #endif
 136     return 0;
 137 }
 138
 139 /* The cpu state corresponding to 'searched_pc' is restored.
 140  */
 141 int cpu_restore_state(TranslationBlock *tb,
 142                       CPUState *env, unsigned long searched_pc,
 143                       void *puc)
 144 {
 145     TCGContext *s = &tcg_ctx;
 146     int j;
 147     unsigned long tc_ptr;
 148 #ifdef CONFIG_PROFILER
 149     int64_t ti;
 150 #endif
 151
 152 #ifdef CONFIG_PROFILER
 153     ti = profile_getclock();
 154 #endif
 155     tcg_func_start(s);
 156
 157     gen_intermediate_code_pc(env, tb);
 158
 159     if (use_icount) {
 160         /* Reset the cycle counter to the start of the block.  */
 161         env->icount_decr.u16.low += tb->icount;
 162         /* Clear the IO flag.  */
 163         env->can_do_io = 0;
 164     }
 165
 166     /* find opc index corresponding to search_pc */
 167     tc_ptr = (unsigned long)tb->tc_ptr;
 168     if (searched_pc < tc_ptr)
 169         return -1;
 170
 171     s->tb_next_offset = tb->tb_next_offset;
 172 #ifdef USE_DIRECT_JUMP
 173     s->tb_jmp_offset = tb->tb_jmp_offset;
 174     s->tb_next = NULL;
 175 #else
 176     s->tb_jmp_offset = NULL;
 177     s->tb_next = tb->tb_next;
 178 #endif
 179     j = tcg_gen_code_search_pc(s, (uint8_t *)tc_ptr, searched_pc - tc_ptr);
 180     if (j < 0)
 181         return -1;
 182     /* now find start of instruction before */
 183     while (gen_opc_instr_start[j] == 0)
 184         j--;
 185     env->icount_decr.u16.low -= gen_opc_icount[j];
 186
 187     gen_pc_load(env, tb, searched_pc, j, puc);
 188
 189 #ifdef CONFIG_PROFILER
 190     s->restore_time += profile_getclock() - ti;
 191     s->restore_count++;
 192 #endif
 193     return 0;
 194 }