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 */
35TCGContext tcg_ctx;
36
37uint16_t gen_opc_buf[OPC_BUF_SIZE];
38TCGArg gen_opparam_buf[OPPARAM_BUF_SIZE];
39
40target_ulong gen_opc_pc[OPC_BUF_SIZE];
41uint16_t gen_opc_icount[OPC_BUF_SIZE];
42uint8_t gen_opc_instr_start[OPC_BUF_SIZE];
43#if defined(TARGET_I386)
44uint8_t gen_opc_cc_op[OPC_BUF_SIZE];
45#elif defined(TARGET_SPARC)
46target_ulong gen_opc_npc[OPC_BUF_SIZE];
47target_ulong gen_opc_jump_pc[2];
48#elif defined(TARGET_MIPS) || defined(TARGET_SH4)
49uint32_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. */
62static void* gen_opc_tpc2gpc[OPC_BUF_SIZE * 2];
63void** gen_opc_tpc2gpc_ptr = &gen_opc_tpc2gpc[0];
64/* Number of (tb_pc, guest_pc) pairs stored in gen_opc_tpc2gpc array. */
65unsigned int gen_opc_tpc2gpc_pairs;
66#endif  // CONFIG_MEMCHECK
67
68/* XXX: suppress that */
69unsigned 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
86void 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*/
99int 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 */
174int 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