File:  [Qemu by Fabrice Bellard] / qemu / translate-all.c
Revision 1.1.1.7 (vendor branch): download - view: text, annotated - select for diffs
Tue Apr 24 18:23:44 2018 UTC (3 years, 4 months ago) by root
Branches: qemu, MAIN
CVS tags: qemu0150, qemu0141, qemu0140, qemu0130, HEAD
qemu 0.13.0

    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:                       void *puc)
  117: {
  118:     TCGContext *s = &tcg_ctx;
  119:     int j;
  120:     unsigned long tc_ptr;
  121: #ifdef CONFIG_PROFILER
  122:     int64_t ti;
  123: #endif
  124: 
  125: #ifdef CONFIG_PROFILER
  126:     ti = profile_getclock();
  127: #endif
  128:     tcg_func_start(s);
  129: 
  130:     gen_intermediate_code_pc(env, tb);
  131: 
  132:     if (use_icount) {
  133:         /* Reset the cycle counter to the start of the block.  */
  134:         env->icount_decr.u16.low += tb->icount;
  135:         /* Clear the IO flag.  */
  136:         env->can_do_io = 0;
  137:     }
  138: 
  139:     /* find opc index corresponding to search_pc */
  140:     tc_ptr = (unsigned long)tb->tc_ptr;
  141:     if (searched_pc < tc_ptr)
  142:         return -1;
  143: 
  144:     s->tb_next_offset = tb->tb_next_offset;
  145: #ifdef USE_DIRECT_JUMP
  146:     s->tb_jmp_offset = tb->tb_jmp_offset;
  147:     s->tb_next = NULL;
  148: #else
  149:     s->tb_jmp_offset = NULL;
  150:     s->tb_next = tb->tb_next;
  151: #endif
  152:     j = tcg_gen_code_search_pc(s, (uint8_t *)tc_ptr, searched_pc - tc_ptr);
  153:     if (j < 0)
  154:         return -1;
  155:     /* now find start of instruction before */
  156:     while (gen_opc_instr_start[j] == 0)
  157:         j--;
  158:     env->icount_decr.u16.low -= gen_opc_icount[j];
  159: 
  160:     gen_pc_load(env, tb, searched_pc, j, puc);
  161: 
  162: #ifdef CONFIG_PROFILER
  163:     s->restore_time += profile_getclock() - ti;
  164:     s->restore_count++;
  165: #endif
  166:     return 0;
  167: }

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