| /* |
| * Host code generation |
| * |
| * Copyright (c) 2003 Fabrice Bellard |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this library; if not, see <http://www.gnu.org/licenses/>. |
| */ |
| #include <stdarg.h> |
| #include <stdlib.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <inttypes.h> |
| |
| #include "config.h" |
| |
| #define NO_CPU_IO_DEFS |
| #include "cpu.h" |
| #include "disas.h" |
| #include "tcg.h" |
| #include "qemu-timer.h" |
| |
| /* code generation context */ |
| TCGContext tcg_ctx; |
| |
| uint16_t gen_opc_buf[OPC_BUF_SIZE]; |
| TCGArg gen_opparam_buf[OPPARAM_BUF_SIZE]; |
| |
| target_ulong gen_opc_pc[OPC_BUF_SIZE]; |
| uint16_t gen_opc_icount[OPC_BUF_SIZE]; |
| uint8_t gen_opc_instr_start[OPC_BUF_SIZE]; |
| |
| void cpu_gen_init(void) |
| { |
| tcg_context_init(&tcg_ctx); |
| } |
| |
| /* return non zero if the very first instruction is invalid so that |
| the virtual CPU can trigger an exception. |
| |
| '*gen_code_size_ptr' contains the size of the generated code (host |
| code). |
| */ |
| int cpu_gen_code(CPUArchState *env, TranslationBlock *tb, int *gen_code_size_ptr) |
| { |
| TCGContext *s = &tcg_ctx; |
| uint8_t *gen_code_buf; |
| int gen_code_size; |
| #ifdef CONFIG_PROFILER |
| int64_t ti; |
| #endif |
| |
| #ifdef CONFIG_PROFILER |
| s->tb_count1++; /* includes aborted translations because of |
| exceptions */ |
| ti = profile_getclock(); |
| #endif |
| tcg_func_start(s); |
| |
| gen_intermediate_code(env, tb); |
| |
| /* generate machine code */ |
| gen_code_buf = tb->tc_ptr; |
| tb->tb_next_offset[0] = 0xffff; |
| tb->tb_next_offset[1] = 0xffff; |
| s->tb_next_offset = tb->tb_next_offset; |
| #ifdef USE_DIRECT_JUMP |
| s->tb_jmp_offset = tb->tb_jmp_offset; |
| s->tb_next = NULL; |
| #else |
| s->tb_jmp_offset = NULL; |
| s->tb_next = tb->tb_next; |
| #endif |
| |
| #ifdef CONFIG_PROFILER |
| s->tb_count++; |
| s->interm_time += profile_getclock() - ti; |
| s->code_time -= profile_getclock(); |
| #endif |
| gen_code_size = tcg_gen_code(s, gen_code_buf); |
| *gen_code_size_ptr = gen_code_size; |
| #ifdef CONFIG_PROFILER |
| s->code_time += profile_getclock(); |
| s->code_in_len += tb->size; |
| s->code_out_len += gen_code_size; |
| #endif |
| |
| #ifdef DEBUG_DISAS |
| if (qemu_loglevel_mask(CPU_LOG_TB_OUT_ASM)) { |
| qemu_log("OUT: [size=%d]\n", *gen_code_size_ptr); |
| log_disas(tb->tc_ptr, *gen_code_size_ptr); |
| qemu_log("\n"); |
| qemu_log_flush(); |
| } |
| #endif |
| return 0; |
| } |
| |
| /* The cpu state corresponding to 'searched_pc' is restored. |
| */ |
| int cpu_restore_state(TranslationBlock *tb, |
| CPUArchState *env, uintptr_t searched_pc) |
| { |
| TCGContext *s = &tcg_ctx; |
| int j; |
| uintptr_t tc_ptr; |
| #ifdef CONFIG_PROFILER |
| int64_t ti; |
| #endif |
| |
| #ifdef CONFIG_PROFILER |
| ti = profile_getclock(); |
| #endif |
| tcg_func_start(s); |
| |
| gen_intermediate_code_pc(env, tb); |
| |
| if (use_icount) { |
| /* Reset the cycle counter to the start of the block. */ |
| env->icount_decr.u16.low += tb->icount; |
| /* Clear the IO flag. */ |
| env->can_do_io = 0; |
| } |
| |
| /* find opc index corresponding to search_pc */ |
| tc_ptr = (uintptr_t)tb->tc_ptr; |
| if (searched_pc < tc_ptr) |
| return -1; |
| |
| s->tb_next_offset = tb->tb_next_offset; |
| #ifdef USE_DIRECT_JUMP |
| s->tb_jmp_offset = tb->tb_jmp_offset; |
| s->tb_next = NULL; |
| #else |
| s->tb_jmp_offset = NULL; |
| s->tb_next = tb->tb_next; |
| #endif |
| j = tcg_gen_code_search_pc(s, (uint8_t *)tc_ptr, searched_pc - tc_ptr); |
| if (j < 0) |
| return -1; |
| /* now find start of instruction before */ |
| while (gen_opc_instr_start[j] == 0) |
| j--; |
| env->icount_decr.u16.low -= gen_opc_icount[j]; |
| |
| restore_state_to_opc(env, tb, j); |
| |
| #ifdef CONFIG_PROFILER |
| s->restore_time += profile_getclock() - ti; |
| s->restore_count++; |
| #endif |
| return 0; |
| } |