xref: /illumos-kvm-cmd/translate-all.c (revision 68396ea9)
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 
cpu_gen_init(void)44 void cpu_gen_init(void)
45 {
46     tcg_context_init(&tcg_ctx);
47     tcg_set_frame(&tcg_ctx, TCG_AREG0, offsetof(CPUState, temp_buf),
48                   CPU_TEMP_BUF_NLONGS * sizeof(long));
49 }
50 
51 /* return non zero if the very first instruction is invalid so that
52    the virtual CPU can trigger an exception.
53 
54    '*gen_code_size_ptr' contains the size of the generated code (host
55    code).
56 */
cpu_gen_code(CPUState * env,TranslationBlock * tb,int * gen_code_size_ptr)57 int cpu_gen_code(CPUState *env, TranslationBlock *tb, int *gen_code_size_ptr)
58 {
59     TCGContext *s = &tcg_ctx;
60     uint8_t *gen_code_buf;
61     int gen_code_size;
62 #ifdef CONFIG_PROFILER
63     int64_t ti;
64 #endif
65 
66 #ifdef CONFIG_PROFILER
67     s->tb_count1++; /* includes aborted translations because of
68                        exceptions */
69     ti = profile_getclock();
70 #endif
71     tcg_func_start(s);
72 
73     gen_intermediate_code(env, tb);
74 
75     /* generate machine code */
76     gen_code_buf = tb->tc_ptr;
77     tb->tb_next_offset[0] = 0xffff;
78     tb->tb_next_offset[1] = 0xffff;
79     s->tb_next_offset = tb->tb_next_offset;
80 #ifdef USE_DIRECT_JUMP
81     s->tb_jmp_offset = tb->tb_jmp_offset;
82     s->tb_next = NULL;
83 #else
84     s->tb_jmp_offset = NULL;
85     s->tb_next = tb->tb_next;
86 #endif
87 
88 #ifdef CONFIG_PROFILER
89     s->tb_count++;
90     s->interm_time += profile_getclock() - ti;
91     s->code_time -= profile_getclock();
92 #endif
93     gen_code_size = tcg_gen_code(s, gen_code_buf);
94     *gen_code_size_ptr = gen_code_size;
95 #ifdef CONFIG_PROFILER
96     s->code_time += profile_getclock();
97     s->code_in_len += tb->size;
98     s->code_out_len += gen_code_size;
99 #endif
100 
101 #ifdef DEBUG_DISAS
102     if (qemu_loglevel_mask(CPU_LOG_TB_OUT_ASM)) {
103         qemu_log("OUT: [size=%d]\n", *gen_code_size_ptr);
104         log_disas(tb->tc_ptr, *gen_code_size_ptr);
105         qemu_log("\n");
106         qemu_log_flush();
107     }
108 #endif
109     return 0;
110 }
111 
112 /* The cpu state corresponding to 'searched_pc' is restored.
113  */
cpu_restore_state(TranslationBlock * tb,CPUState * env,unsigned long searched_pc,void * puc)114 int cpu_restore_state(TranslationBlock *tb,
115                       CPUState *env, unsigned long searched_pc,
116                       void *puc)
117 {
118     TCGContext *s = &tcg_ctx;
119     int j;
120     unsigned long tc_ptr;
121 #ifdef CONFIG_PROFILER
122     int64_t ti;
123 #endif
124 
125 #ifdef CONFIG_PROFILER
126     ti = profile_getclock();
127 #endif
128     tcg_func_start(s);
129 
130     gen_intermediate_code_pc(env, tb);
131 
132     if (use_icount) {
133         /* Reset the cycle counter to the start of the block.  */
134         env->icount_decr.u16.low += tb->icount;
135         /* Clear the IO flag.  */
136         env->can_do_io = 0;
137     }
138 
139     /* find opc index corresponding to search_pc */
140     tc_ptr = (unsigned long)tb->tc_ptr;
141     if (searched_pc < tc_ptr)
142         return -1;
143 
144     s->tb_next_offset = tb->tb_next_offset;
145 #ifdef USE_DIRECT_JUMP
146     s->tb_jmp_offset = tb->tb_jmp_offset;
147     s->tb_next = NULL;
148 #else
149     s->tb_jmp_offset = NULL;
150     s->tb_next = tb->tb_next;
151 #endif
152     j = tcg_gen_code_search_pc(s, (uint8_t *)tc_ptr, searched_pc - tc_ptr);
153     if (j < 0)
154         return -1;
155     /* now find start of instruction before */
156     while (gen_opc_instr_start[j] == 0)
157         j--;
158     env->icount_decr.u16.low -= gen_opc_icount[j];
159 
160     gen_pc_load(env, tb, searched_pc, j, puc);
161 
162 #ifdef CONFIG_PROFILER
163     s->restore_time += profile_getclock() - ti;
164     s->restore_count++;
165 #endif
166     return 0;
167 }
168