Disable preadv/pwritev support
[qemu-kvm/fedora.git] / translate-all.c
blob8ef8a0b2f5784ca8adbe2e5253ce6076e83138f3
1 /*
2 * Host code generation
4 * Copyright (c) 2003 Fabrice Bellard
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.
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.
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/>.
19 #include <stdarg.h>
20 #include <stdlib.h>
21 #include <stdio.h>
22 #include <string.h>
23 #include <inttypes.h>
25 #include "config.h"
27 #define NO_CPU_IO_DEFS
28 #include "cpu.h"
29 #include "exec-all.h"
30 #include "disas.h"
31 #include "tcg.h"
33 /* code generation context */
34 TCGContext tcg_ctx;
36 uint16_t gen_opc_buf[OPC_BUF_SIZE];
37 TCGArg gen_opparam_buf[OPPARAM_BUF_SIZE];
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
51 /* XXX: suppress that */
52 unsigned long code_gen_max_block_size(void)
54 static unsigned long max;
56 if (max == 0) {
57 max = TCG_MAX_OP_SIZE;
58 #define DEF(s, n, copy_size) max = copy_size > max? copy_size : max;
59 #include "tcg-opc.h"
60 #undef DEF
61 max *= OPC_MAX_SIZE;
64 return max;
67 void cpu_gen_init(void)
69 tcg_context_init(&tcg_ctx);
70 tcg_set_frame(&tcg_ctx, TCG_AREG0, offsetof(CPUState, temp_buf),
71 CPU_TEMP_BUF_NLONGS * sizeof(long));
74 /* return non zero if the very first instruction is invalid so that
75 the virtual CPU can trigger an exception.
77 '*gen_code_size_ptr' contains the size of the generated code (host
78 code).
80 int cpu_gen_code(CPUState *env, TranslationBlock *tb, int *gen_code_size_ptr)
82 TCGContext *s = &tcg_ctx;
83 uint8_t *gen_code_buf;
84 int gen_code_size;
85 #ifdef CONFIG_PROFILER
86 int64_t ti;
87 #endif
89 #ifdef CONFIG_PROFILER
90 s->tb_count1++; /* includes aborted translations because of
91 exceptions */
92 ti = profile_getclock();
93 #endif
94 tcg_func_start(s);
96 gen_intermediate_code(env, tb);
98 /* generate machine code */
99 gen_code_buf = tb->tc_ptr;
100 tb->tb_next_offset[0] = 0xffff;
101 tb->tb_next_offset[1] = 0xffff;
102 s->tb_next_offset = tb->tb_next_offset;
103 #ifdef USE_DIRECT_JUMP
104 s->tb_jmp_offset = tb->tb_jmp_offset;
105 s->tb_next = NULL;
106 /* the following two entries are optional (only used for string ops) */
107 /* XXX: not used ? */
108 tb->tb_jmp_offset[2] = 0xffff;
109 tb->tb_jmp_offset[3] = 0xffff;
110 #else
111 s->tb_jmp_offset = NULL;
112 s->tb_next = tb->tb_next;
113 #endif
115 #ifdef CONFIG_PROFILER
116 s->tb_count++;
117 s->interm_time += profile_getclock() - ti;
118 s->code_time -= profile_getclock();
119 #endif
120 gen_code_size = tcg_gen_code(s, gen_code_buf);
121 *gen_code_size_ptr = gen_code_size;
122 #ifdef CONFIG_PROFILER
123 s->code_time += profile_getclock();
124 s->code_in_len += tb->size;
125 s->code_out_len += gen_code_size;
126 #endif
128 #ifdef DEBUG_DISAS
129 if (qemu_loglevel_mask(CPU_LOG_TB_OUT_ASM)) {
130 qemu_log("OUT: [size=%d]\n", *gen_code_size_ptr);
131 log_disas(tb->tc_ptr, *gen_code_size_ptr);
132 qemu_log("\n");
133 qemu_log_flush();
135 #endif
136 return 0;
139 /* The cpu state corresponding to 'searched_pc' is restored.
141 int cpu_restore_state(TranslationBlock *tb,
142 CPUState *env, unsigned long searched_pc,
143 void *puc)
145 TCGContext *s = &tcg_ctx;
146 int j;
147 unsigned long tc_ptr;
148 #ifdef CONFIG_PROFILER
149 int64_t ti;
150 #endif
152 #ifdef CONFIG_PROFILER
153 ti = profile_getclock();
154 #endif
155 tcg_func_start(s);
157 gen_intermediate_code_pc(env, tb);
159 if (use_icount) {
160 /* Reset the cycle counter to the start of the block. */
161 env->icount_decr.u16.low += tb->icount;
162 /* Clear the IO flag. */
163 env->can_do_io = 0;
166 /* find opc index corresponding to search_pc */
167 tc_ptr = (unsigned long)tb->tc_ptr;
168 if (searched_pc < tc_ptr)
169 return -1;
171 s->tb_next_offset = tb->tb_next_offset;
172 #ifdef USE_DIRECT_JUMP
173 s->tb_jmp_offset = tb->tb_jmp_offset;
174 s->tb_next = NULL;
175 #else
176 s->tb_jmp_offset = NULL;
177 s->tb_next = tb->tb_next;
178 #endif
179 j = tcg_gen_code_search_pc(s, (uint8_t *)tc_ptr, searched_pc - tc_ptr);
180 if (j < 0)
181 return -1;
182 /* now find start of instruction before */
183 while (gen_opc_instr_start[j] == 0)
184 j--;
185 env->icount_decr.u16.low -= gen_opc_icount[j];
187 gen_pc_load(env, tb, searched_pc, j, puc);
189 #ifdef CONFIG_PROFILER
190 s->restore_time += profile_getclock() - ti;
191 s->restore_count++;
192 #endif
193 return 0;