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