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