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 /* XXX: suppress that */
code_gen_max_block_size(void)53 unsigned long code_gen_max_block_size(void)
54 {
55 static unsigned long max;
56
57 if (max == 0) {
58 max = TCG_MAX_OP_SIZE;
59 #define DEF(s, n, copy_size) max = copy_size > max? copy_size : max;
60 #include "tcg-opc.h"
61 #undef DEF
62 max *= OPC_MAX_SIZE;
63 }
64
65 return max;
66 }
67
cpu_gen_init(void)68 void cpu_gen_init(void)
69 {
70 tcg_context_init(&tcg_ctx);
71 tcg_set_frame(&tcg_ctx, TCG_AREG0, offsetof(CPUState, temp_buf),
72 CPU_TEMP_BUF_NLONGS * sizeof(long));
73 }
74
75 /* return non zero if the very first instruction is invalid so that
76 the virtual CPU can trigger an exception.
77
78 '*gen_code_size_ptr' contains the size of the generated code (host
79 code).
80 */
cpu_gen_code(CPUState * env,TranslationBlock * tb,int * gen_code_size_ptr)81 int cpu_gen_code(CPUState *env, TranslationBlock *tb, int *gen_code_size_ptr)
82 {
83 TCGContext *s = &tcg_ctx;
84 uint8_t *gen_code_buf;
85 int gen_code_size;
86 #ifdef CONFIG_PROFILER
87 int64_t ti;
88 #endif
89
90 #ifdef CONFIG_PROFILER
91 s->tb_count1++; /* includes aborted translations because of
92 exceptions */
93 ti = profile_getclock();
94 #endif
95 tcg_func_start(s);
96
97 gen_intermediate_code(env, tb);
98
99 /* generate machine code */
100 gen_code_buf = tb->tc_ptr;
101 tb->tb_next_offset[0] = 0xffff;
102 tb->tb_next_offset[1] = 0xffff;
103 s->tb_next_offset = tb->tb_next_offset;
104 #ifdef USE_DIRECT_JUMP
105 s->tb_jmp_offset = tb->tb_jmp_offset;
106 s->tb_next = NULL;
107 /* the following two entries are optional (only used for string ops) */
108 /* XXX: not used ? */
109 tb->tb_jmp_offset[2] = 0xffff;
110 tb->tb_jmp_offset[3] = 0xffff;
111 #else
112 s->tb_jmp_offset = NULL;
113 s->tb_next = tb->tb_next;
114 #endif
115
116 #ifdef CONFIG_PROFILER
117 s->tb_count++;
118 s->interm_time += profile_getclock() - ti;
119 s->code_time -= profile_getclock();
120 #endif
121 gen_code_size = tcg_gen_code(s, gen_code_buf);
122 *gen_code_size_ptr = gen_code_size;
123 #ifdef CONFIG_PROFILER
124 s->code_time += profile_getclock();
125 s->code_in_len += tb->size;
126 s->code_out_len += gen_code_size;
127 #endif
128
129 #ifdef DEBUG_DISAS
130 if (qemu_loglevel_mask(CPU_LOG_TB_OUT_ASM)) {
131 qemu_log("OUT: [size=%d]\n", *gen_code_size_ptr);
132 log_disas(tb->tc_ptr, *gen_code_size_ptr);
133 qemu_log("\n");
134 qemu_log_flush();
135 }
136 #endif
137 return 0;
138 }
139
140 /* The cpu state corresponding to 'searched_pc' is restored.
141 */
cpu_restore_state(TranslationBlock * tb,CPUState * env,unsigned long searched_pc,void * puc)142 int cpu_restore_state(TranslationBlock *tb,
143 CPUState *env, unsigned long searched_pc,
144 void *puc)
145 {
146 TCGContext *s = &tcg_ctx;
147 int j;
148 unsigned long tc_ptr;
149 #ifdef CONFIG_PROFILER
150 int64_t ti;
151 #endif
152
153 #ifdef CONFIG_PROFILER
154 ti = profile_getclock();
155 #endif
156 tcg_func_start(s);
157
158 gen_intermediate_code_pc(env, tb);
159
160 if (use_icount) {
161 /* Reset the cycle counter to the start of the block. */
162 env->icount_decr.u16.low += tb->icount;
163 /* Clear the IO flag. */
164 env->can_do_io = 0;
165 }
166
167 /* find opc index corresponding to search_pc */
168 tc_ptr = (unsigned long)tb->tc_ptr;
169 if (searched_pc < tc_ptr)
170 return -1;
171
172 s->tb_next_offset = tb->tb_next_offset;
173 #ifdef USE_DIRECT_JUMP
174 s->tb_jmp_offset = tb->tb_jmp_offset;
175 s->tb_next = NULL;
176 #else
177 s->tb_jmp_offset = NULL;
178 s->tb_next = tb->tb_next;
179 #endif
180 j = tcg_gen_code_search_pc(s, (uint8_t *)tc_ptr, searched_pc - tc_ptr);
181 if (j < 0)
182 return -1;
183 /* now find start of instruction before */
184 while (gen_opc_instr_start[j] == 0)
185 j--;
186 env->icount_decr.u16.low -= gen_opc_icount[j];
187
188 gen_pc_load(env, tb, searched_pc, j, puc);
189
190 #ifdef CONFIG_PROFILER
191 s->restore_time += profile_getclock() - ti;
192 s->restore_count++;
193 #endif
194 return 0;
195 }
196