aboutsummaryrefslogtreecommitdiff
path: root/translate-all.c
blob: 91cbbc4929397c73e864e844ce25d1d4748c2806 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
/*
 *  Host code generation
 *
 *  Copyright (c) 2003 Fabrice Bellard
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
 */
#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <inttypes.h>

#include "config.h"

#define NO_CPU_IO_DEFS
#include "cpu.h"
#include "exec-all.h"
#include "disas.h"
#include "tcg.h"
#include "qemu-timer.h"

/* code generation context */
TCGContext tcg_ctx;

uint16_t gen_opc_buf[OPC_BUF_SIZE];
TCGArg gen_opparam_buf[OPPARAM_BUF_SIZE];

target_ulong gen_opc_pc[OPC_BUF_SIZE];
uint16_t gen_opc_icount[OPC_BUF_SIZE];
uint8_t gen_opc_instr_start[OPC_BUF_SIZE];

/* XXX: suppress that */
unsigned long code_gen_max_block_size(void)
{
    static unsigned long max;

    if (max == 0) {
        max = TCG_MAX_OP_SIZE;
#define DEF(s, n, copy_size) max = copy_size > max? copy_size : max;
#include "tcg-opc.h"
#undef DEF
        max *= OPC_MAX_SIZE;
    }

    return max;
}

void cpu_gen_init(void)
{
    tcg_context_init(&tcg_ctx); 
    tcg_set_frame(&tcg_ctx, TCG_AREG0, offsetof(CPUState, temp_buf),
                  CPU_TEMP_BUF_NLONGS * sizeof(long));
}

/* return non zero if the very first instruction is invalid so that
   the virtual CPU can trigger an exception.

   '*gen_code_size_ptr' contains the size of the generated code (host
   code).
*/
int cpu_gen_code(CPUState *env, TranslationBlock *tb, int *gen_code_size_ptr)
{
    TCGContext *s = &tcg_ctx;
    uint8_t *gen_code_buf;
    int gen_code_size;
#ifdef CONFIG_PROFILER
    int64_t ti;
#endif

#ifdef CONFIG_PROFILER
    s->tb_count1++; /* includes aborted translations because of
                       exceptions */
    ti = profile_getclock();
#endif
    tcg_func_start(s);

    gen_intermediate_code(env, tb);

    /* generate machine code */
    gen_code_buf = tb->tc_ptr;
    tb->tb_next_offset[0] = 0xffff;
    tb->tb_next_offset[1] = 0xffff;
    s->tb_next_offset = tb->tb_next_offset;
#ifdef USE_DIRECT_JUMP
    s->tb_jmp_offset = tb->tb_jmp_offset;
    s->tb_next = NULL;
#else
    s->tb_jmp_offset = NULL;
    s->tb_next = tb->tb_next;
#endif

#ifdef CONFIG_PROFILER
    s->tb_count++;
    s->interm_time += profile_getclock() - ti;
    s->code_time -= profile_getclock();
#endif
    gen_code_size = tcg_gen_code(s, gen_code_buf);
    *gen_code_size_ptr = gen_code_size;
#ifdef CONFIG_PROFILER
    s->code_time += profile_getclock();
    s->code_in_len += tb->size;
    s->code_out_len += gen_code_size;
#endif

#ifdef DEBUG_DISAS
    if (qemu_loglevel_mask(CPU_LOG_TB_OUT_ASM)) {
        qemu_log("OUT: [size=%d]\n", *gen_code_size_ptr);
        log_disas(tb->tc_ptr, *gen_code_size_ptr);
        qemu_log("\n");
        qemu_log_flush();
    }
#endif
    return 0;
}

/* The cpu state corresponding to 'searched_pc' is restored.
 */
int cpu_restore_state(TranslationBlock *tb,
                      CPUState *env, unsigned long searched_pc,
                      void *puc)
{
    TCGContext *s = &tcg_ctx;
    int j;
    unsigned long tc_ptr;
#ifdef CONFIG_PROFILER
    int64_t ti;
#endif

#ifdef CONFIG_PROFILER
    ti = profile_getclock();
#endif
    tcg_func_start(s);

    gen_intermediate_code_pc(env, tb);

    if (use_icount) {
        /* Reset the cycle counter to the start of the block.  */
        env->icount_decr.u16.low += tb->icount;
        /* Clear the IO flag.  */
        env->can_do_io = 0;
    }

    /* find opc index corresponding to search_pc */
    tc_ptr = (unsigned long)tb->tc_ptr;
    if (searched_pc < tc_ptr)
        return -1;

    s->tb_next_offset = tb->tb_next_offset;
#ifdef USE_DIRECT_JUMP
    s->tb_jmp_offset = tb->tb_jmp_offset;
    s->tb_next = NULL;
#else
    s->tb_jmp_offset = NULL;
    s->tb_next = tb->tb_next;
#endif
    j = tcg_gen_code_search_pc(s, (uint8_t *)tc_ptr, searched_pc - tc_ptr);
    if (j < 0)
        return -1;
    /* now find start of instruction before */
    while (gen_opc_instr_start[j] == 0)
        j--;
    env->icount_decr.u16.low -= gen_opc_icount[j];

    gen_pc_load(env, tb, searched_pc, j, puc);

#ifdef CONFIG_PROFILER
    s->restore_time += profile_getclock() - ti;
    s->restore_count++;
#endif
    return 0;
}