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, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA 19 */ 20 #include <stdarg.h> 21 #include <stdlib.h> 22 #include <stdio.h> 23 #include <string.h> 24 #include <inttypes.h> 25 26 #include "config.h" 27 28 #define NO_CPU_IO_DEFS 29 #include "cpu.h" 30 #include "exec-all.h" 31 #include "disas.h" 32 #include "tcg.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 #if defined(TARGET_I386) 44 uint8_t gen_opc_cc_op[OPC_BUF_SIZE]; 45 #elif defined(TARGET_SPARC) 46 target_ulong gen_opc_npc[OPC_BUF_SIZE]; 47 target_ulong gen_opc_jump_pc[2]; 48 #elif defined(TARGET_MIPS) || defined(TARGET_SH4) 49 uint32_t gen_opc_hflags[OPC_BUF_SIZE]; 50 #endif 51 52 #ifdef CONFIG_MEMCHECK 53 /* 54 * Memchecker code in this module copies TB PC <-> Guest PC map to the TB 55 * descriptor after guest code has been translated in cpu_gen_init routine. 56 */ 57 #include "memcheck/memcheck_api.h" 58 59 /* Array of (tb_pc, guest_pc) pairs, big enough for all translations. This 60 * array is used to obtain guest PC address from a translated PC address. 61 * tcg_gen_code_common will fill it up when memchecker is enabled. */ 62 static target_ulong gen_opc_tpc2gpc[OPC_BUF_SIZE * 2]; 63 target_ulong* gen_opc_tpc2gpc_ptr = &gen_opc_tpc2gpc[0]; 64 /* Number of (tb_pc, guest_pc) pairs stored in gen_opc_tpc2gpc array. */ 65 unsigned int gen_opc_tpc2gpc_pairs; 66 #endif // CONFIG_MEMCHECK 67 68 /* XXX: suppress that */ 69 unsigned long code_gen_max_block_size(void) 70 { 71 static unsigned long max; 72 73 if (max == 0) { 74 max = TCG_MAX_OP_SIZE; 75 #define DEF(s, n, copy_size) max = copy_size > max? copy_size : max; 76 #include "tcg-opc.h" 77 #undef DEF 78 max *= OPC_MAX_SIZE; 79 } 80 81 return max; 82 } 83 84 void cpu_gen_init(void) 85 { 86 tcg_context_init(&tcg_ctx); 87 tcg_set_frame(&tcg_ctx, TCG_AREG0, offsetof(CPUState, temp_buf), 88 CPU_TEMP_BUF_NLONGS * sizeof(long)); 89 } 90 91 /* return non zero if the very first instruction is invalid so that 92 the virtual CPU can trigger an exception. 93 94 '*gen_code_size_ptr' contains the size of the generated code (host 95 code). 96 */ 97 int cpu_gen_code(CPUState *env, TranslationBlock *tb, int *gen_code_size_ptr) 98 { 99 TCGContext *s = &tcg_ctx; 100 uint8_t *gen_code_buf; 101 int gen_code_size; 102 #ifdef CONFIG_PROFILER 103 int64_t ti; 104 #endif 105 106 #ifdef CONFIG_PROFILER 107 s->tb_count1++; /* includes aborted translations because of 108 exceptions */ 109 ti = profile_getclock(); 110 #endif 111 tcg_func_start(s); 112 113 gen_intermediate_code(env, tb); 114 115 /* generate machine code */ 116 gen_code_buf = tb->tc_ptr; 117 tb->tb_next_offset[0] = 0xffff; 118 tb->tb_next_offset[1] = 0xffff; 119 s->tb_next_offset = tb->tb_next_offset; 120 #ifdef USE_DIRECT_JUMP 121 s->tb_jmp_offset = tb->tb_jmp_offset; 122 s->tb_next = NULL; 123 /* the following two entries are optional (only used for string ops) */ 124 /* XXX: not used ? */ 125 tb->tb_jmp_offset[2] = 0xffff; 126 tb->tb_jmp_offset[3] = 0xffff; 127 #else 128 s->tb_jmp_offset = NULL; 129 s->tb_next = tb->tb_next; 130 #endif 131 132 #ifdef CONFIG_PROFILER 133 s->tb_count++; 134 s->interm_time += profile_getclock() - ti; 135 s->code_time -= profile_getclock(); 136 #endif 137 gen_code_size = tcg_gen_code(s, gen_code_buf); 138 *gen_code_size_ptr = gen_code_size; 139 #ifdef CONFIG_PROFILER 140 s->code_time += profile_getclock(); 141 s->code_in_len += tb->size; 142 s->code_out_len += gen_code_size; 143 #endif 144 145 #ifdef CONFIG_MEMCHECK 146 /* Save translated PC -> guest PC map into TB. */ 147 if (memcheck_enabled && gen_opc_tpc2gpc_pairs && is_cpu_user(env)) { 148 tb->tpc2gpc = 149 qemu_malloc(gen_opc_tpc2gpc_pairs * 2 * sizeof(target_ulong)); 150 if (tb->tpc2gpc != NULL) { 151 memcpy(tb->tpc2gpc, gen_opc_tpc2gpc_ptr, 152 gen_opc_tpc2gpc_pairs * 2 * sizeof(target_ulong)); 153 tb->tpc2gpc_pairs = gen_opc_tpc2gpc_pairs; 154 } 155 } 156 #endif // CONFIG_MEMCHECK 157 158 #ifdef DEBUG_DISAS 159 if (qemu_loglevel_mask(CPU_LOG_TB_OUT_ASM)) { 160 qemu_log("OUT: [size=%d]\n", *gen_code_size_ptr); 161 log_disas(tb->tc_ptr, *gen_code_size_ptr); 162 qemu_log("\n"); 163 qemu_log_flush(); 164 } 165 #endif 166 return 0; 167 } 168 169 /* The cpu state corresponding to 'searched_pc' is restored. 170 */ 171 int cpu_restore_state(TranslationBlock *tb, 172 CPUState *env, unsigned long searched_pc, 173 void *puc) 174 { 175 TCGContext *s = &tcg_ctx; 176 int j; 177 unsigned long tc_ptr; 178 #ifdef CONFIG_PROFILER 179 int64_t ti; 180 #endif 181 182 #ifdef CONFIG_PROFILER 183 ti = profile_getclock(); 184 #endif 185 tcg_func_start(s); 186 187 gen_intermediate_code_pc(env, tb); 188 189 if (use_icount) { 190 /* Reset the cycle counter to the start of the block. */ 191 env->icount_decr.u16.low += tb->icount; 192 /* Clear the IO flag. */ 193 env->can_do_io = 0; 194 } 195 196 /* find opc index corresponding to search_pc */ 197 tc_ptr = (unsigned long)tb->tc_ptr; 198 if (searched_pc < tc_ptr) 199 return -1; 200 201 s->tb_next_offset = tb->tb_next_offset; 202 #ifdef USE_DIRECT_JUMP 203 s->tb_jmp_offset = tb->tb_jmp_offset; 204 s->tb_next = NULL; 205 #else 206 s->tb_jmp_offset = NULL; 207 s->tb_next = tb->tb_next; 208 #endif 209 j = tcg_gen_code_search_pc(s, (uint8_t *)tc_ptr, searched_pc - tc_ptr); 210 if (j < 0) 211 return -1; 212 /* now find start of instruction before */ 213 while (gen_opc_instr_start[j] == 0) 214 j--; 215 env->icount_decr.u16.low -= gen_opc_icount[j]; 216 217 gen_pc_load(env, tb, searched_pc, j, puc); 218 219 #ifdef CONFIG_PROFILER 220 s->restore_time += profile_getclock() - ti; 221 s->restore_count++; 222 #endif 223 return 0; 224 } 225
