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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 "disas.h" | |
30 | #include "tcg.h" | |
31 | #include "qemu-timer.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 | ||
43 | void cpu_gen_init(void) | |
44 | { | |
45 | tcg_context_init(&tcg_ctx); | |
46 | } | |
47 | ||
48 | /* return non zero if the very first instruction is invalid so that | |
49 | the virtual CPU can trigger an exception. | |
50 | ||
51 | '*gen_code_size_ptr' contains the size of the generated code (host | |
52 | code). | |
53 | */ | |
54 | int cpu_gen_code(CPUArchState *env, TranslationBlock *tb, int *gen_code_size_ptr) | |
55 | { | |
56 | TCGContext *s = &tcg_ctx; | |
57 | uint8_t *gen_code_buf; | |
58 | int gen_code_size; | |
59 | #ifdef CONFIG_PROFILER | |
60 | int64_t ti; | |
61 | #endif | |
62 | ||
63 | #ifdef CONFIG_PROFILER | |
64 | s->tb_count1++; /* includes aborted translations because of | |
65 | exceptions */ | |
66 | ti = profile_getclock(); | |
67 | #endif | |
68 | tcg_func_start(s); | |
69 | ||
70 | gen_intermediate_code(env, tb); | |
71 | ||
72 | /* generate machine code */ | |
73 | gen_code_buf = tb->tc_ptr; | |
74 | tb->tb_next_offset[0] = 0xffff; | |
75 | tb->tb_next_offset[1] = 0xffff; | |
76 | s->tb_next_offset = tb->tb_next_offset; | |
77 | #ifdef USE_DIRECT_JUMP | |
78 | s->tb_jmp_offset = tb->tb_jmp_offset; | |
79 | s->tb_next = NULL; | |
80 | #else | |
81 | s->tb_jmp_offset = NULL; | |
82 | s->tb_next = tb->tb_next; | |
83 | #endif | |
84 | ||
85 | #ifdef CONFIG_PROFILER | |
86 | s->tb_count++; | |
87 | s->interm_time += profile_getclock() - ti; | |
88 | s->code_time -= profile_getclock(); | |
89 | #endif | |
90 | gen_code_size = tcg_gen_code(s, gen_code_buf); | |
91 | *gen_code_size_ptr = gen_code_size; | |
92 | #ifdef CONFIG_PROFILER | |
93 | s->code_time += profile_getclock(); | |
94 | s->code_in_len += tb->size; | |
95 | s->code_out_len += gen_code_size; | |
96 | #endif | |
97 | ||
98 | #ifdef DEBUG_DISAS | |
99 | if (qemu_loglevel_mask(CPU_LOG_TB_OUT_ASM)) { | |
100 | qemu_log("OUT: [size=%d]\n", *gen_code_size_ptr); | |
101 | log_disas(tb->tc_ptr, *gen_code_size_ptr); | |
102 | qemu_log("\n"); | |
103 | qemu_log_flush(); | |
104 | } | |
105 | #endif | |
106 | return 0; | |
107 | } | |
108 | ||
109 | /* The cpu state corresponding to 'searched_pc' is restored. | |
110 | */ | |
111 | int cpu_restore_state(TranslationBlock *tb, | |
112 | CPUArchState *env, unsigned long searched_pc) | |
113 | { | |
114 | TCGContext *s = &tcg_ctx; | |
115 | int j; | |
116 | unsigned long tc_ptr; | |
117 | #ifdef CONFIG_PROFILER | |
118 | int64_t ti; | |
119 | #endif | |
120 | ||
121 | #ifdef CONFIG_PROFILER | |
122 | ti = profile_getclock(); | |
123 | #endif | |
124 | tcg_func_start(s); | |
125 | ||
126 | gen_intermediate_code_pc(env, tb); | |
127 | ||
128 | if (use_icount) { | |
129 | /* Reset the cycle counter to the start of the block. */ | |
130 | env->icount_decr.u16.low += tb->icount; | |
131 | /* Clear the IO flag. */ | |
132 | env->can_do_io = 0; | |
133 | } | |
134 | ||
135 | /* find opc index corresponding to search_pc */ | |
136 | tc_ptr = (unsigned long)tb->tc_ptr; | |
137 | if (searched_pc < tc_ptr) | |
138 | return -1; | |
139 | ||
140 | s->tb_next_offset = tb->tb_next_offset; | |
141 | #ifdef USE_DIRECT_JUMP | |
142 | s->tb_jmp_offset = tb->tb_jmp_offset; | |
143 | s->tb_next = NULL; | |
144 | #else | |
145 | s->tb_jmp_offset = NULL; | |
146 | s->tb_next = tb->tb_next; | |
147 | #endif | |
148 | j = tcg_gen_code_search_pc(s, (uint8_t *)tc_ptr, searched_pc - tc_ptr); | |
149 | if (j < 0) | |
150 | return -1; | |
151 | /* now find start of instruction before */ | |
152 | while (gen_opc_instr_start[j] == 0) | |
153 | j--; | |
154 | env->icount_decr.u16.low -= gen_opc_icount[j]; | |
155 | ||
156 | restore_state_to_opc(env, tb, j); | |
157 | ||
158 | #ifdef CONFIG_PROFILER | |
159 | s->restore_time += profile_getclock() - ti; | |
160 | s->restore_count++; | |
161 | #endif | |
162 | return 0; | |
163 | } |