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