2 * internal execution defines for qemu
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, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 /* allow to see translation results - the slowdown should be negligible, so we leave it */
24 /* is_jmp field values */
25 #define DISAS_NEXT 0 /* next instruction can be analyzed */
26 #define DISAS_JUMP 1 /* only pc was modified dynamically */
27 #define DISAS_UPDATE 2 /* cpu state was modified dynamically */
28 #define DISAS_TB_JUMP 3 /* only pc was modified statically */
30 struct TranslationBlock;
32 /* XXX: make safe guess about sizes */
33 #define MAX_OP_PER_INSTR 32
34 #define OPC_BUF_SIZE 512
35 #define OPC_MAX_SIZE (OPC_BUF_SIZE - MAX_OP_PER_INSTR)
37 #define OPPARAM_BUF_SIZE (OPC_BUF_SIZE * 3)
39 extern uint16_t gen_opc_buf[OPC_BUF_SIZE];
40 extern uint32_t gen_opparam_buf[OPPARAM_BUF_SIZE];
41 extern uint32_t gen_opc_pc[OPC_BUF_SIZE];
42 extern uint8_t gen_opc_cc_op[OPC_BUF_SIZE];
43 extern uint8_t gen_opc_instr_start[OPC_BUF_SIZE];
45 #if defined(TARGET_I386)
47 #define GEN_FLAG_CODE32_SHIFT 0
48 #define GEN_FLAG_ADDSEG_SHIFT 1
49 #define GEN_FLAG_SS32_SHIFT 2
50 #define GEN_FLAG_VM_SHIFT 3
51 #define GEN_FLAG_ST_SHIFT 4
52 #define GEN_FLAG_TF_SHIFT 8 /* same position as eflags */
53 #define GEN_FLAG_CPL_SHIFT 9
54 #define GEN_FLAG_IOPL_SHIFT 12 /* same position as eflags */
61 int gen_intermediate_code(struct TranslationBlock *tb);
62 int gen_intermediate_code_pc(struct TranslationBlock *tb);
63 void dump_ops(const uint16_t *opc_buf, const uint32_t *opparam_buf);
64 int cpu_gen_code(struct TranslationBlock *tb,
65 int max_code_size, int *gen_code_size_ptr);
66 int cpu_restore_state(struct TranslationBlock *tb,
67 CPUState *env, unsigned long searched_pc);
68 void cpu_exec_init(void);
69 int page_unprotect(unsigned long address);
70 void page_unmap(void);
72 #define CODE_GEN_MAX_SIZE 65536
73 #define CODE_GEN_ALIGN 16 /* must be >= of the size of a icache line */
75 #define CODE_GEN_HASH_BITS 15
76 #define CODE_GEN_HASH_SIZE (1 << CODE_GEN_HASH_BITS)
78 /* maximum total translate dcode allocated */
79 #define CODE_GEN_BUFFER_SIZE (2048 * 1024)
80 //#define CODE_GEN_BUFFER_SIZE (128 * 1024)
82 #if defined(__powerpc__)
83 #define USE_DIRECT_JUMP
86 typedef struct TranslationBlock {
87 unsigned long pc; /* simulated PC corresponding to this block (EIP + CS base) */
88 unsigned long cs_base; /* CS base for this block */
89 unsigned int flags; /* flags defining in which context the code was generated */
90 uint16_t size; /* size of target code for this block (1 <=
91 size <= TARGET_PAGE_SIZE) */
92 uint8_t *tc_ptr; /* pointer to the translated code */
93 struct TranslationBlock *hash_next; /* next matching block */
94 struct TranslationBlock *page_next[2]; /* next blocks in even/odd page */
95 /* the following data are used to directly call another TB from
96 the code of this one. */
97 uint16_t tb_next_offset[2]; /* offset of original jump target */
98 #ifdef USE_DIRECT_JUMP
99 uint16_t tb_jmp_offset[2]; /* offset of jump instruction */
101 uint32_t tb_next[2]; /* address of jump generated code */
103 /* list of TBs jumping to this one. This is a circular list using
104 the two least significant bits of the pointers to tell what is
105 the next pointer: 0 = jmp_next[0], 1 = jmp_next[1], 2 =
107 struct TranslationBlock *jmp_next[2];
108 struct TranslationBlock *jmp_first;
111 static inline unsigned int tb_hash_func(unsigned long pc)
113 return pc & (CODE_GEN_HASH_SIZE - 1);
116 TranslationBlock *tb_alloc(unsigned long pc);
118 void tb_link(TranslationBlock *tb);
120 extern TranslationBlock *tb_hash[CODE_GEN_HASH_SIZE];
122 extern uint8_t code_gen_buffer[CODE_GEN_BUFFER_SIZE];
123 extern uint8_t *code_gen_ptr;
125 /* find a translation block in the translation cache. If not found,
126 return NULL and the pointer to the last element of the list in pptb */
127 static inline TranslationBlock *tb_find(TranslationBlock ***pptb,
129 unsigned long cs_base,
132 TranslationBlock **ptb, *tb;
135 h = tb_hash_func(pc);
141 if (tb->pc == pc && tb->cs_base == cs_base && tb->flags == flags)
143 ptb = &tb->hash_next;
149 #if defined(__powerpc__)
151 static inline void tb_set_jmp_target(TranslationBlock *tb,
152 int n, unsigned long addr)
155 unsigned long offset;
157 offset = (unsigned long)(tb->tc_ptr + tb->tb_jmp_offset[n]);
159 /* patch the branch destination */
160 ptr = (uint32_t *)offset;
162 val = (val & ~0x03fffffc) | ((addr - offset) & 0x03fffffc);
165 asm volatile ("dcbst 0,%0" : : "r"(ptr) : "memory");
166 asm volatile ("sync" : : : "memory");
167 asm volatile ("icbi 0,%0" : : "r"(ptr) : "memory");
168 asm volatile ("sync" : : : "memory");
169 asm volatile ("isync" : : : "memory");
174 /* set the jump target */
175 static inline void tb_set_jmp_target(TranslationBlock *tb,
176 int n, unsigned long addr)
178 tb->tb_next[n] = addr;
183 static inline void tb_add_jump(TranslationBlock *tb, int n,
184 TranslationBlock *tb_next)
186 /* NOTE: this test is only needed for thread safety */
187 if (!tb->jmp_next[n]) {
188 /* patch the native jump address */
189 tb_set_jmp_target(tb, n, (unsigned long)tb_next->tc_ptr);
191 /* add in TB jmp circular list */
192 tb->jmp_next[n] = tb_next->jmp_first;
193 tb_next->jmp_first = (TranslationBlock *)((long)(tb) | (n));
197 TranslationBlock *tb_find_pc(unsigned long pc_ptr);
200 #define offsetof(type, field) ((size_t) &((type *)0)->field)
203 #if defined(__powerpc__)
205 /* on PowerPC we patch the jump instruction directly */
206 #define JUMP_TB(tbparam, n, eip)\
208 static void __attribute__((unused)) *__op_label ## n = &&label ## n;\
209 asm volatile ("b %0" : : "i" (&__op_jmp ## n));\
211 T0 = (long)(tbparam) + (n);\
217 /* jump to next block operations (more portable code, does not need
218 cache flushing, but slower because of indirect jump) */
219 #define JUMP_TB(tbparam, n, eip)\
221 static void __attribute__((unused)) *__op_label ## n = &&label ## n;\
222 static void __attribute__((unused)) *dummy ## n = &&dummy_label ## n;\
223 goto *(void *)(((TranslationBlock *)tbparam)->tb_next[n]);\
225 T0 = (long)(tbparam) + (n);\
233 static inline int testandset (int *p)
236 __asm__ __volatile__ (
244 : "r" (p), "r" (1), "r" (0)
251 static inline int testandset (int *p)
256 __asm__ __volatile__ ("lock; cmpxchgl %3, %1; sete %0"
257 : "=q" (ret), "=m" (*p), "=a" (readval)
258 : "r" (1), "m" (*p), "a" (0)
265 static inline int testandset (int *p)
269 __asm__ __volatile__ ("0: cs %0,%1,0(%2)\n"
272 : "r" (1), "a" (p), "0" (*p)
279 static inline int testandset (int *p)
284 __asm__ __volatile__ ("0: mov 1,%2\n"
291 : "=r" (ret), "=m" (*p), "=r" (one)
298 static inline int testandset (int *p)
302 __asm__ __volatile__("ldstub [%1], %0"
307 return (ret ? 1 : 0);
312 static inline int testandset (int *spinlock)
314 register unsigned int ret;
315 __asm__ __volatile__("swp %0, %1, [%2]"
317 : "0"(1), "r"(spinlock));
323 typedef int spinlock_t;
325 #define SPIN_LOCK_UNLOCKED 0
327 static inline void spin_lock(spinlock_t *lock)
329 while (testandset(lock));
332 static inline void spin_unlock(spinlock_t *lock)
337 static inline int spin_trylock(spinlock_t *lock)
339 return !testandset(lock);
342 extern spinlock_t tb_lock;