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 */
code_gen_max_block_size(void)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
cpu_gen_init(void)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 */
cpu_gen_code(CPUState * env,TranslationBlock * tb,int * gen_code_size_ptr)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 */
cpu_restore_state(TranslationBlock * tb,CPUState * env,unsigned long searched_pc,void * puc)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