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 target_ulong gen_opc_pc[OPC_BUF_SIZE];
  37 uint16_t gen_opc_icount[OPC_BUF_SIZE];
  38 uint8_t gen_opc_instr_start[OPC_BUF_SIZE];
  39
  40 void cpu_gen_init(void)
  41 {
  42     tcg_context_init(&tcg_ctx);
  43 }
  44
  45 /* return non zero if the very first instruction is invalid so that
  46    the virtual CPU can trigger an exception.
  47
  48    '*gen_code_size_ptr' contains the size of the generated code (host
  49    code).
  50 */
  51 int cpu_gen_code(CPUArchState *env, TranslationBlock *tb, int *gen_code_size_ptr)
  52 {
  53     TCGContext *s = &tcg_ctx;
  54     uint8_t *gen_code_buf;
  55     int gen_code_size;
  56 #ifdef CONFIG_PROFILER
  57     int64_t ti;
  58 #endif
  59
  60 #ifdef CONFIG_PROFILER
  61     s->tb_count1++; /* includes aborted translations because of
  62                        exceptions */
  63     ti = profile_getclock();
  64 #endif
  65     tcg_func_start(s);
  66
  67     gen_intermediate_code(env, tb);
  68
  69     /* generate machine code */
  70     gen_code_buf = tb->tc_ptr;
  71     tb->tb_next_offset[0] = 0xffff;
  72     tb->tb_next_offset[1] = 0xffff;
  73     s->tb_next_offset = tb->tb_next_offset;
  74 #ifdef USE_DIRECT_JUMP
  75     s->tb_jmp_offset = tb->tb_jmp_offset;
  76     s->tb_next = NULL;
  77 #else
  78     s->tb_jmp_offset = NULL;
  79     s->tb_next = tb->tb_next;
  80 #endif
  81
  82 #ifdef CONFIG_PROFILER
  83     s->tb_count++;
  84     s->interm_time += profile_getclock() - ti;
  85     s->code_time -= profile_getclock();
  86 #endif
  87     gen_code_size = tcg_gen_code(s, gen_code_buf);
  88     *gen_code_size_ptr = gen_code_size;
  89 #ifdef CONFIG_PROFILER
  90     s->code_time += profile_getclock();
  91     s->code_in_len += tb->size;
  92     s->code_out_len += gen_code_size;
  93 #endif
  94
  95 #ifdef DEBUG_DISAS
  96     if (qemu_loglevel_mask(CPU_LOG_TB_OUT_ASM)) {
  97         qemu_log("OUT: [size=%d]\n", *gen_code_size_ptr);
  98         log_disas(tb->tc_ptr, *gen_code_size_ptr);
  99         qemu_log("\n");
 100         qemu_log_flush();
 101     }
 102 #endif
 103     return 0;
 104 }
 105
 106 /* The cpu state corresponding to 'searched_pc' is restored.
 107  */
 108 int cpu_restore_state(TranslationBlock *tb,
 109                       CPUArchState *env, uintptr_t searched_pc)
 110 {
 111     TCGContext *s = &tcg_ctx;
 112     int j;
 113     uintptr_t tc_ptr;
 114 #ifdef CONFIG_PROFILER
 115     int64_t ti;
 116 #endif
 117
 118 #ifdef CONFIG_PROFILER
 119     ti = profile_getclock();
 120 #endif
 121     tcg_func_start(s);
 122
 123     gen_intermediate_code_pc(env, tb);
 124
 125     if (use_icount) {
 126         /* Reset the cycle counter to the start of the block.  */
 127         env->icount_decr.u16.low += tb->icount;
 128         /* Clear the IO flag.  */
 129         env->can_do_io = 0;
 130     }
 131
 132     /* find opc index corresponding to search_pc */
 133     tc_ptr = (uintptr_t)tb->tc_ptr;
 134     if (searched_pc < tc_ptr)
 135         return -1;
 136
 137     s->tb_next_offset = tb->tb_next_offset;
 138 #ifdef USE_DIRECT_JUMP
 139     s->tb_jmp_offset = tb->tb_jmp_offset;
 140     s->tb_next = NULL;
 141 #else
 142     s->tb_jmp_offset = NULL;
 143     s->tb_next = tb->tb_next;
 144 #endif
 145     j = tcg_gen_code_search_pc(s, (uint8_t *)tc_ptr, searched_pc - tc_ptr);
 146     if (j < 0)
 147         return -1;
 148     /* now find start of instruction before */
 149     while (gen_opc_instr_start[j] == 0)
 150         j--;
 151     env->icount_decr.u16.low -= gen_opc_icount[j];
 152
 153     restore_state_to_opc(env, tb, j);
 154
 155 #ifdef CONFIG_PROFILER
 156     s->restore_time += profile_getclock() - ti;
 157     s->restore_count++;
 158 #endif
 159     return 0;
 160 }