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