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 #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 void* gen_opc_tpc2gpc[OPC_BUF_SIZE * 2];
63 void** 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 */
code_gen_max_block_size(void)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(name, iarg, oarg, carg, flags) DEF2((iarg) + (oarg) + (carg))
76 #define DEF2(copy_size) max = (copy_size > max) ? copy_size : max;
77 #include "tcg-opc.h"
78 #undef DEF
79 #undef DEF2
80 max *= OPC_MAX_SIZE;
81 }
82
83 return max;
84 }
85
cpu_gen_init(void)86 void cpu_gen_init(void)
87 {
88 tcg_context_init(&tcg_ctx);
89 tcg_set_frame(&tcg_ctx, TCG_AREG0, offsetof(CPUState, temp_buf),
90 CPU_TEMP_BUF_NLONGS * sizeof(long));
91 }
92
93 /* return non zero if the very first instruction is invalid so that
94 the virtual CPU can trigger an exception.
95
96 '*gen_code_size_ptr' contains the size of the generated code (host
97 code).
98 */
cpu_gen_code(CPUState * env,TranslationBlock * tb,int * gen_code_size_ptr)99 int cpu_gen_code(CPUState *env, TranslationBlock *tb, int *gen_code_size_ptr)
100 {
101 TCGContext *s = &tcg_ctx;
102 uint8_t *gen_code_buf;
103 int gen_code_size;
104 #ifdef CONFIG_PROFILER
105 int64_t ti;
106 #endif
107
108 #ifdef CONFIG_PROFILER
109 s->tb_count1++; /* includes aborted translations because of
110 exceptions */
111 ti = profile_getclock();
112 #endif
113 tcg_func_start(s);
114
115 gen_intermediate_code(env, tb);
116
117 /* generate machine code */
118 gen_code_buf = tb->tc_ptr;
119 tb->tb_next_offset[0] = 0xffff;
120 tb->tb_next_offset[1] = 0xffff;
121 s->tb_next_offset = tb->tb_next_offset;
122 #ifdef USE_DIRECT_JUMP
123 s->tb_jmp_offset = tb->tb_jmp_offset;
124 s->tb_next = NULL;
125 /* the following two entries are optional (only used for string ops) */
126 /* XXX: not used ? */
127 tb->tb_jmp_offset[2] = 0xffff;
128 tb->tb_jmp_offset[3] = 0xffff;
129 #else
130 s->tb_jmp_offset = NULL;
131 s->tb_next = tb->tb_next;
132 #endif
133
134 #ifdef CONFIG_PROFILER
135 s->tb_count++;
136 s->interm_time += profile_getclock() - ti;
137 s->code_time -= profile_getclock();
138 #endif
139 gen_code_size = tcg_gen_code(s, gen_code_buf);
140 *gen_code_size_ptr = gen_code_size;
141 #ifdef CONFIG_PROFILER
142 s->code_time += profile_getclock();
143 s->code_in_len += tb->size;
144 s->code_out_len += gen_code_size;
145 #endif
146
147 #ifdef CONFIG_MEMCHECK
148 /* Save translated PC -> guest PC map into TB. */
149 if (memcheck_enabled && gen_opc_tpc2gpc_pairs && is_cpu_user(env)) {
150 tb->tpc2gpc =
151 qemu_malloc(gen_opc_tpc2gpc_pairs * 2 * sizeof(uintptr_t));
152 if (tb->tpc2gpc != NULL) {
153 memcpy(tb->tpc2gpc, gen_opc_tpc2gpc_ptr,
154 gen_opc_tpc2gpc_pairs * 2 * sizeof(uintptr_t));
155 tb->tpc2gpc_pairs = gen_opc_tpc2gpc_pairs;
156 }
157
158 }
159 #endif // CONFIG_MEMCHECK
160
161 #ifdef DEBUG_DISAS
162 if (qemu_loglevel_mask(CPU_LOG_TB_OUT_ASM)) {
163 qemu_log("OUT: [size=%d]\n", *gen_code_size_ptr);
164 log_disas(tb->tc_ptr, *gen_code_size_ptr);
165 qemu_log("\n");
166 qemu_log_flush();
167 }
168 #endif
169 return 0;
170 }
171
172 /* The cpu state corresponding to 'searched_pc' is restored.
173 */
cpu_restore_state(TranslationBlock * tb,CPUState * env,unsigned long searched_pc)174 int cpu_restore_state(TranslationBlock *tb,
175 CPUState *env, unsigned long searched_pc)
176 {
177 TCGContext *s = &tcg_ctx;
178 int j;
179 unsigned long tc_ptr;
180 #ifdef CONFIG_PROFILER
181 int64_t ti;
182 #endif
183
184 #ifdef CONFIG_PROFILER
185 ti = profile_getclock();
186 #endif
187 tcg_func_start(s);
188
189 gen_intermediate_code_pc(env, tb);
190
191 if (use_icount) {
192 /* Reset the cycle counter to the start of the block. */
193 env->icount_decr.u16.low += tb->icount;
194 /* Clear the IO flag. */
195 env->can_do_io = 0;
196 }
197
198 /* find opc index corresponding to search_pc */
199 tc_ptr = (unsigned long)tb->tc_ptr;
200 if (searched_pc < tc_ptr)
201 return -1;
202
203 s->tb_next_offset = tb->tb_next_offset;
204 #ifdef USE_DIRECT_JUMP
205 s->tb_jmp_offset = tb->tb_jmp_offset;
206 s->tb_next = NULL;
207 #else
208 s->tb_jmp_offset = NULL;
209 s->tb_next = tb->tb_next;
210 #endif
211 j = tcg_gen_code_search_pc(s, (uint8_t *)tc_ptr, searched_pc - tc_ptr);
212 if (j < 0)
213 return -1;
214 /* now find start of instruction before */
215 while (gen_opc_instr_start[j] == 0)
216 j--;
217 env->icount_decr.u16.low -= gen_opc_icount[j];
218
219 restore_state_to_opc(env, tb, j);
220
221 #ifdef CONFIG_PROFILER
222 s->restore_time += profile_getclock() - ti;
223 s->restore_count++;
224 #endif
225 return 0;
226 }
227