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 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 #if defined(TARGET_I386) 43 uint8_t gen_opc_cc_op[OPC_BUF_SIZE]; 44 #elif defined(TARGET_SPARC) 45 target_ulong gen_opc_npc[OPC_BUF_SIZE]; 46 target_ulong gen_opc_jump_pc[2]; 47 #elif defined(TARGET_MIPS) || defined(TARGET_SH4) 48 uint32_t gen_opc_hflags[OPC_BUF_SIZE]; 49 #endif 50 51 #ifdef CONFIG_MEMCHECK 52 /* 53 * Memchecker code in this module copies TB PC <-> Guest PC map to the TB 54 * descriptor after guest code has been translated in cpu_gen_init routine. 55 */ 56 #include "memcheck/memcheck_api.h" 57 58 /* Array of (tb_pc, guest_pc) pairs, big enough for all translations. This 59 * array is used to obtain guest PC address from a translated PC address. 60 * tcg_gen_code_common will fill it up when memchecker is enabled. */ 61 static target_ulong gen_opc_tpc2gpc[OPC_BUF_SIZE * 2]; 62 target_ulong* gen_opc_tpc2gpc_ptr = &gen_opc_tpc2gpc[0]; 63 /* Number of (tb_pc, guest_pc) pairs stored in gen_opc_tpc2gpc array. */ 64 unsigned int gen_opc_tpc2gpc_pairs; 65 #endif // CONFIG_MEMCHECK 66 67 /* XXX: suppress that */ 68 unsigned long code_gen_max_block_size(void) 69 { 70 static unsigned long max; 71 72 if (max == 0) { 73 max = TCG_MAX_OP_SIZE; 74 #define DEF(s, n, copy_size) max = copy_size > max? copy_size : max; 75 #include "tcg-opc.h" 76 #undef DEF 77 max *= OPC_MAX_SIZE; 78 } 79 80 return max; 81 } 82 83 void cpu_gen_init(void) 84 { 85 tcg_context_init(&tcg_ctx); 86 tcg_set_frame(&tcg_ctx, TCG_AREG0, offsetof(CPUState, temp_buf), 87 CPU_TEMP_BUF_NLONGS * sizeof(long)); 88 } 89 90 /* return non zero if the very first instruction is invalid so that 91 the virtual CPU can trigger an exception. 92 93 '*gen_code_size_ptr' contains the size of the generated code (host 94 code). 95 */ 96 int cpu_gen_code(CPUState *env, TranslationBlock *tb, int *gen_code_size_ptr) 97 { 98 TCGContext *s = &tcg_ctx; 99 uint8_t *gen_code_buf; 100 int gen_code_size; 101 #ifdef CONFIG_PROFILER 102 int64_t ti; 103 #endif 104 105 #ifdef CONFIG_PROFILER 106 s->tb_count1++; /* includes aborted translations because of 107 exceptions */ 108 ti = profile_getclock(); 109 #endif 110 tcg_func_start(s); 111 112 gen_intermediate_code(env, tb); 113 114 /* generate machine code */ 115 gen_code_buf = tb->tc_ptr; 116 tb->tb_next_offset[0] = 0xffff; 117 tb->tb_next_offset[1] = 0xffff; 118 s->tb_next_offset = tb->tb_next_offset; 119 #ifdef USE_DIRECT_JUMP 120 s->tb_jmp_offset = tb->tb_jmp_offset; 121 s->tb_next = NULL; 122 /* the following two entries are optional (only used for string ops) */ 123 /* XXX: not used ? */ 124 tb->tb_jmp_offset[2] = 0xffff; 125 tb->tb_jmp_offset[3] = 0xffff; 126 #else 127 s->tb_jmp_offset = NULL; 128 s->tb_next = tb->tb_next; 129 #endif 130 131 #ifdef CONFIG_PROFILER 132 s->tb_count++; 133 s->interm_time += profile_getclock() - ti; 134 s->code_time -= profile_getclock(); 135 #endif 136 gen_code_size = tcg_gen_code(s, gen_code_buf); 137 *gen_code_size_ptr = gen_code_size; 138 #ifdef CONFIG_PROFILER 139 s->code_time += profile_getclock(); 140 s->code_in_len += tb->size; 141 s->code_out_len += gen_code_size; 142 #endif 143 144 #ifdef CONFIG_MEMCHECK 145 /* Save translated PC -> guest PC map into TB. */ 146 if (memcheck_enabled && gen_opc_tpc2gpc_pairs && is_cpu_user(env)) { 147 tb->tpc2gpc = 148 qemu_malloc(gen_opc_tpc2gpc_pairs * 2 * sizeof(target_ulong)); 149 if (tb->tpc2gpc != NULL) { 150 memcpy(tb->tpc2gpc, gen_opc_tpc2gpc_ptr, 151 gen_opc_tpc2gpc_pairs * 2 * sizeof(target_ulong)); 152 tb->tpc2gpc_pairs = gen_opc_tpc2gpc_pairs; 153 } 154 } 155 #endif // CONFIG_MEMCHECK 156 157 #ifdef DEBUG_DISAS 158 if (qemu_loglevel_mask(CPU_LOG_TB_OUT_ASM)) { 159 qemu_log("OUT: [size=%d]\n", *gen_code_size_ptr); 160 log_disas(tb->tc_ptr, *gen_code_size_ptr); 161 qemu_log("\n"); 162 qemu_log_flush(); 163 } 164 #endif 165 return 0; 166 } 167 168 /* The cpu state corresponding to 'searched_pc' is restored. 169 */ 170 int cpu_restore_state(TranslationBlock *tb, 171 CPUState *env, unsigned long searched_pc, 172 void *puc) 173 { 174 TCGContext *s = &tcg_ctx; 175 int j; 176 unsigned long tc_ptr; 177 #ifdef CONFIG_PROFILER 178 int64_t ti; 179 #endif 180 181 #ifdef CONFIG_PROFILER 182 ti = profile_getclock(); 183 #endif 184 tcg_func_start(s); 185 186 gen_intermediate_code_pc(env, tb); 187 188 if (use_icount) { 189 /* Reset the cycle counter to the start of the block. */ 190 env->icount_decr.u16.low += tb->icount; 191 /* Clear the IO flag. */ 192 env->can_do_io = 0; 193 } 194 195 /* find opc index corresponding to search_pc */ 196 tc_ptr = (unsigned long)tb->tc_ptr; 197 if (searched_pc < tc_ptr) 198 return -1; 199 200 s->tb_next_offset = tb->tb_next_offset; 201 #ifdef USE_DIRECT_JUMP 202 s->tb_jmp_offset = tb->tb_jmp_offset; 203 s->tb_next = NULL; 204 #else 205 s->tb_jmp_offset = NULL; 206 s->tb_next = tb->tb_next; 207 #endif 208 j = tcg_gen_code_search_pc(s, (uint8_t *)tc_ptr, searched_pc - tc_ptr); 209 if (j < 0) 210 return -1; 211 /* now find start of instruction before */ 212 while (gen_opc_instr_start[j] == 0) 213 j--; 214 env->icount_decr.u16.low -= gen_opc_icount[j]; 215 216 gen_pc_load(env, tb, searched_pc, j, puc); 217 218 #ifdef CONFIG_PROFILER 219 s->restore_time += profile_getclock() - ti; 220 s->restore_count++; 221 #endif 222 return 0; 223 } 224
