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 #include "qemu-timer.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
  44 /* XXX: suppress that */
  45 unsigned long code_gen_max_block_size(void)
  46 {
  47     static unsigned long max;
  48
  49     if (max == 0) {
  50         max = TCG_MAX_OP_SIZE;
  51 #define DEF(s, n, copy_size) max = copy_size > max? copy_size : max;
  52 #include "tcg-opc.h"
  53 #undef DEF
  54         max *= OPC_MAX_SIZE;
  55     }
  56
  57     return max;
  58 }
  59
  60 void cpu_gen_init(void)
  61 {
  62     tcg_context_init(&tcg_ctx);
  63     tcg_set_frame(&tcg_ctx, TCG_AREG0, offsetof(CPUState, temp_buf),
  64                   CPU_TEMP_BUF_NLONGS * sizeof(long));
  65 }
  66
  67 /* return non zero if the very first instruction is invalid so that
  68    the virtual CPU can trigger an exception.
  69
  70    '*gen_code_size_ptr' contains the size of the generated code (host
  71    code).
  72 */
  73 int cpu_gen_code(CPUState *env, TranslationBlock *tb, int *gen_code_size_ptr)
  74 {
  75     TCGContext *s = &tcg_ctx;
  76     uint8_t *gen_code_buf;
  77     int gen_code_size;
  78 #ifdef CONFIG_PROFILER
  79     int64_t ti;
  80 #endif
  81
  82 #ifdef CONFIG_PROFILER
  83     s->tb_count1++; /* includes aborted translations because of
  84                        exceptions */
  85     ti = profile_getclock();
  86 #endif
  87     tcg_func_start(s);
  88
  89     gen_intermediate_code(env, tb);
  90
  91     /* generate machine code */
  92     gen_code_buf = tb->tc_ptr;
  93     tb->tb_next_offset[0] = 0xffff;
  94     tb->tb_next_offset[1] = 0xffff;
  95     s->tb_next_offset = tb->tb_next_offset;
  96 #ifdef USE_DIRECT_JUMP
  97     s->tb_jmp_offset = tb->tb_jmp_offset;
  98     s->tb_next = NULL;
  99 #else
 100     s->tb_jmp_offset = NULL;
 101     s->tb_next = tb->tb_next;
 102 #endif
 103
 104 #ifdef CONFIG_PROFILER
 105     s->tb_count++;
 106     s->interm_time += profile_getclock() - ti;
 107     s->code_time -= profile_getclock();
 108 #endif
 109     gen_code_size = tcg_gen_code(s, gen_code_buf);
 110     *gen_code_size_ptr = gen_code_size;
 111 #ifdef CONFIG_PROFILER
 112     s->code_time += profile_getclock();
 113     s->code_in_len += tb->size;
 114     s->code_out_len += gen_code_size;
 115 #endif
 116
 117 #ifdef DEBUG_DISAS
 118     if (qemu_loglevel_mask(CPU_LOG_TB_OUT_ASM)) {
 119         qemu_log("OUT: [size=%d]\n", *gen_code_size_ptr);
 120         log_disas(tb->tc_ptr, *gen_code_size_ptr);
 121         qemu_log("\n");
 122         qemu_log_flush();
 123     }
 124 #endif
 125     return 0;
 126 }
 127
 128 /* The cpu state corresponding to 'searched_pc' is restored.
 129  */
 130 int cpu_restore_state(TranslationBlock *tb,
 131                       CPUState *env, unsigned long searched_pc,
 132                       void *puc)
 133 {
 134     TCGContext *s = &tcg_ctx;
 135     int j;
 136     unsigned long tc_ptr;
 137 #ifdef CONFIG_PROFILER
 138     int64_t ti;
 139 #endif
 140
 141 #ifdef CONFIG_PROFILER
 142     ti = profile_getclock();
 143 #endif
 144     tcg_func_start(s);
 145
 146     gen_intermediate_code_pc(env, tb);
 147
 148     if (use_icount) {
 149         /* Reset the cycle counter to the start of the block.  */
 150         env->icount_decr.u16.low += tb->icount;
 151         /* Clear the IO flag.  */
 152         env->can_do_io = 0;
 153     }
 154
 155     /* find opc index corresponding to search_pc */
 156     tc_ptr = (unsigned long)tb->tc_ptr;
 157     if (searched_pc < tc_ptr)
 158         return -1;
 159
 160     s->tb_next_offset = tb->tb_next_offset;
 161 #ifdef USE_DIRECT_JUMP
 162     s->tb_jmp_offset = tb->tb_jmp_offset;
 163     s->tb_next = NULL;
 164 #else
 165     s->tb_jmp_offset = NULL;
 166     s->tb_next = tb->tb_next;
 167 #endif
 168     j = tcg_gen_code_search_pc(s, (uint8_t *)tc_ptr, searched_pc - tc_ptr);
 169     if (j < 0)
 170         return -1;
 171     /* now find start of instruction before */
 172     while (gen_opc_instr_start[j] == 0)
 173         j--;
 174     env->icount_decr.u16.low -= gen_opc_icount[j];
 175
 176     gen_pc_load(env, tb, searched_pc, j, puc);
 177
 178 #ifdef CONFIG_PROFILER
 179     s->restore_time += profile_getclock() - ti;
 180     s->restore_count++;
 181 #endif
 182     return 0;
 183 }