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, see <http://www.gnu.org/licenses/>.
23 #include "qemu-common.h"
25 /* allow to see translation results - the slowdown should be negligible, so we leave it */
28 /* Page tracking code uses ram addresses in system mode, and virtual
29 addresses in userspace mode. Define tb_page_addr_t to be an appropriate
31 #if defined(CONFIG_USER_ONLY)
32 typedef abi_ulong tb_page_addr_t;
34 typedef ram_addr_t tb_page_addr_t;
37 /* is_jmp field values */
38 #define DISAS_NEXT 0 /* next instruction can be analyzed */
39 #define DISAS_JUMP 1 /* only pc was modified dynamically */
40 #define DISAS_UPDATE 2 /* cpu state was modified dynamically */
41 #define DISAS_TB_JUMP 3 /* only pc was modified statically */
43 struct TranslationBlock;
44 typedef struct TranslationBlock TranslationBlock;
46 /* XXX: make safe guess about sizes */
47 #define MAX_OP_PER_INSTR 266
49 #if HOST_LONG_BITS == 32
50 #define MAX_OPC_PARAM_PER_ARG 2
52 #define MAX_OPC_PARAM_PER_ARG 1
54 #define MAX_OPC_PARAM_IARGS 5
55 #define MAX_OPC_PARAM_OARGS 1
56 #define MAX_OPC_PARAM_ARGS (MAX_OPC_PARAM_IARGS + MAX_OPC_PARAM_OARGS)
58 /* A Call op needs up to 4 + 2N parameters on 32-bit archs,
59 * and up to 4 + N parameters on 64-bit archs
60 * (N = number of input arguments + output arguments). */
61 #define MAX_OPC_PARAM (4 + (MAX_OPC_PARAM_PER_ARG * MAX_OPC_PARAM_ARGS))
62 #define OPC_BUF_SIZE 640
63 #define OPC_MAX_SIZE (OPC_BUF_SIZE - MAX_OP_PER_INSTR)
65 /* Maximum size a TCG op can expand to. This is complicated because a
66 single op may require several host instructions and register reloads.
67 For now take a wild guess at 192 bytes, which should allow at least
68 a couple of fixup instructions per argument. */
69 #define TCG_MAX_OP_SIZE 192
71 #define OPPARAM_BUF_SIZE (OPC_BUF_SIZE * MAX_OPC_PARAM)
75 void gen_intermediate_code(CPUArchState *env, struct TranslationBlock *tb);
76 void gen_intermediate_code_pc(CPUArchState *env, struct TranslationBlock *tb);
77 void restore_state_to_opc(CPUArchState *env, struct TranslationBlock *tb,
80 void cpu_gen_init(void);
81 int cpu_gen_code(CPUArchState *env, struct TranslationBlock *tb,
82 int *gen_code_size_ptr);
83 bool cpu_restore_state(CPUState *cpu, uintptr_t searched_pc);
84 void page_size_init(void);
86 void QEMU_NORETURN cpu_resume_from_signal(CPUState *cpu, void *puc);
87 void QEMU_NORETURN cpu_io_recompile(CPUState *cpu, uintptr_t retaddr);
88 TranslationBlock *tb_gen_code(CPUState *cpu,
89 target_ulong pc, target_ulong cs_base, int flags,
91 void cpu_exec_init(CPUArchState *env);
92 void QEMU_NORETURN cpu_loop_exit(CPUState *cpu);
93 int page_unprotect(target_ulong address, uintptr_t pc, void *puc);
94 void tb_invalidate_phys_page_range(tb_page_addr_t start, tb_page_addr_t end,
95 int is_cpu_write_access);
96 void tb_invalidate_phys_range(tb_page_addr_t start, tb_page_addr_t end,
97 int is_cpu_write_access);
98 #if !defined(CONFIG_USER_ONLY)
99 void tcg_cpu_address_space_init(CPUState *cpu, AddressSpace *as);
101 void tlb_flush_page(CPUState *cpu, target_ulong addr);
102 void tlb_flush(CPUState *cpu, int flush_global);
103 void tlb_set_page(CPUState *cpu, target_ulong vaddr,
104 hwaddr paddr, int prot,
105 int mmu_idx, target_ulong size);
106 void tb_invalidate_phys_addr(AddressSpace *as, hwaddr addr);
108 static inline void tlb_flush_page(CPUState *cpu, target_ulong addr)
112 static inline void tlb_flush(CPUState *cpu, int flush_global)
117 #define CODE_GEN_ALIGN 16 /* must be >= of the size of a icache line */
119 #define CODE_GEN_PHYS_HASH_BITS 15
120 #define CODE_GEN_PHYS_HASH_SIZE (1 << CODE_GEN_PHYS_HASH_BITS)
122 /* estimated block size for TB allocation */
123 /* XXX: use a per code average code fragment size and modulate it
124 according to the host CPU */
125 #if defined(CONFIG_SOFTMMU)
126 #define CODE_GEN_AVG_BLOCK_SIZE 128
128 #define CODE_GEN_AVG_BLOCK_SIZE 64
131 #if defined(__arm__) || defined(_ARCH_PPC) \
132 || defined(__x86_64__) || defined(__i386__) \
133 || defined(__sparc__) || defined(__aarch64__) \
134 || defined(__s390x__) || defined(__mips__) \
135 || defined(CONFIG_TCG_INTERPRETER)
136 #define USE_DIRECT_JUMP
139 struct TranslationBlock {
140 target_ulong pc; /* simulated PC corresponding to this block (EIP + CS base) */
141 target_ulong cs_base; /* CS base for this block */
142 uint64_t flags; /* flags defining in which context the code was generated */
143 uint16_t size; /* size of target code for this block (1 <=
144 size <= TARGET_PAGE_SIZE) */
146 uint32_t cflags; /* compile flags */
147 #define CF_COUNT_MASK 0x7fff
148 #define CF_LAST_IO 0x8000 /* Last insn may be an IO access. */
149 #define CF_NOCACHE 0x10000 /* To be freed after execution */
150 #define CF_USE_ICOUNT 0x20000
152 void *tc_ptr; /* pointer to the translated code */
153 /* next matching tb for physical address. */
154 struct TranslationBlock *phys_hash_next;
155 /* first and second physical page containing code. The lower bit
156 of the pointer tells the index in page_next[] */
157 struct TranslationBlock *page_next[2];
158 tb_page_addr_t page_addr[2];
160 /* the following data are used to directly call another TB from
161 the code of this one. */
162 uint16_t tb_next_offset[2]; /* offset of original jump target */
163 #ifdef USE_DIRECT_JUMP
164 uint16_t tb_jmp_offset[2]; /* offset of jump instruction */
166 uintptr_t tb_next[2]; /* address of jump generated code */
168 /* list of TBs jumping to this one. This is a circular list using
169 the two least significant bits of the pointers to tell what is
170 the next pointer: 0 = jmp_next[0], 1 = jmp_next[1], 2 =
172 struct TranslationBlock *jmp_next[2];
173 struct TranslationBlock *jmp_first;
176 #include "exec/spinlock.h"
178 typedef struct TBContext TBContext;
182 TranslationBlock *tbs;
183 TranslationBlock *tb_phys_hash[CODE_GEN_PHYS_HASH_SIZE];
185 /* any access to the tbs or the page table must use this lock */
190 int tb_phys_invalidate_count;
192 int tb_invalidated_flag;
195 static inline unsigned int tb_jmp_cache_hash_page(target_ulong pc)
198 tmp = pc ^ (pc >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS));
199 return (tmp >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS)) & TB_JMP_PAGE_MASK;
202 static inline unsigned int tb_jmp_cache_hash_func(target_ulong pc)
205 tmp = pc ^ (pc >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS));
206 return (((tmp >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS)) & TB_JMP_PAGE_MASK)
207 | (tmp & TB_JMP_ADDR_MASK));
210 static inline unsigned int tb_phys_hash_func(tb_page_addr_t pc)
212 return (pc >> 2) & (CODE_GEN_PHYS_HASH_SIZE - 1);
215 void tb_free(TranslationBlock *tb);
216 void tb_flush(CPUArchState *env);
217 void tb_phys_invalidate(TranslationBlock *tb, tb_page_addr_t page_addr);
219 #if defined(USE_DIRECT_JUMP)
221 #if defined(CONFIG_TCG_INTERPRETER)
222 static inline void tb_set_jmp_target1(uintptr_t jmp_addr, uintptr_t addr)
224 /* patch the branch destination */
225 *(uint32_t *)jmp_addr = addr - (jmp_addr + 4);
226 /* no need to flush icache explicitly */
228 #elif defined(_ARCH_PPC)
229 void ppc_tb_set_jmp_target(uintptr_t jmp_addr, uintptr_t addr);
230 #define tb_set_jmp_target1 ppc_tb_set_jmp_target
231 #elif defined(__i386__) || defined(__x86_64__)
232 static inline void tb_set_jmp_target1(uintptr_t jmp_addr, uintptr_t addr)
234 /* patch the branch destination */
235 stl_le_p((void*)jmp_addr, addr - (jmp_addr + 4));
236 /* no need to flush icache explicitly */
238 #elif defined(__s390x__)
239 static inline void tb_set_jmp_target1(uintptr_t jmp_addr, uintptr_t addr)
241 /* patch the branch destination */
242 intptr_t disp = addr - (jmp_addr - 2);
243 stl_be_p((void*)jmp_addr, disp / 2);
244 /* no need to flush icache explicitly */
246 #elif defined(__aarch64__)
247 void aarch64_tb_set_jmp_target(uintptr_t jmp_addr, uintptr_t addr);
248 #define tb_set_jmp_target1 aarch64_tb_set_jmp_target
249 #elif defined(__arm__)
250 static inline void tb_set_jmp_target1(uintptr_t jmp_addr, uintptr_t addr)
252 #if !QEMU_GNUC_PREREQ(4, 1)
253 register unsigned long _beg __asm ("a1");
254 register unsigned long _end __asm ("a2");
255 register unsigned long _flg __asm ("a3");
258 /* we could use a ldr pc, [pc, #-4] kind of branch and avoid the flush */
259 *(uint32_t *)jmp_addr =
260 (*(uint32_t *)jmp_addr & ~0xffffff)
261 | (((addr - (jmp_addr + 8)) >> 2) & 0xffffff);
263 #if QEMU_GNUC_PREREQ(4, 1)
264 __builtin___clear_cache((char *) jmp_addr, (char *) jmp_addr + 4);
270 __asm __volatile__ ("swi 0x9f0002" : : "r" (_beg), "r" (_end), "r" (_flg));
273 #elif defined(__sparc__) || defined(__mips__)
274 void tb_set_jmp_target1(uintptr_t jmp_addr, uintptr_t addr);
276 #error tb_set_jmp_target1 is missing
279 static inline void tb_set_jmp_target(TranslationBlock *tb,
280 int n, uintptr_t addr)
282 uint16_t offset = tb->tb_jmp_offset[n];
283 tb_set_jmp_target1((uintptr_t)(tb->tc_ptr + offset), addr);
288 /* set the jump target */
289 static inline void tb_set_jmp_target(TranslationBlock *tb,
290 int n, uintptr_t addr)
292 tb->tb_next[n] = addr;
297 static inline void tb_add_jump(TranslationBlock *tb, int n,
298 TranslationBlock *tb_next)
300 /* NOTE: this test is only needed for thread safety */
301 if (!tb->jmp_next[n]) {
302 /* patch the native jump address */
303 tb_set_jmp_target(tb, n, (uintptr_t)tb_next->tc_ptr);
305 /* add in TB jmp circular list */
306 tb->jmp_next[n] = tb_next->jmp_first;
307 tb_next->jmp_first = (TranslationBlock *)((uintptr_t)(tb) | (n));
311 /* GETRA is the true target of the return instruction that we'll execute,
312 defined here for simplicity of defining the follow-up macros. */
313 #if defined(CONFIG_TCG_INTERPRETER)
314 extern uintptr_t tci_tb_ptr;
315 # define GETRA() tci_tb_ptr
318 ((uintptr_t)__builtin_extract_return_addr(__builtin_return_address(0)))
321 /* The true return address will often point to a host insn that is part of
322 the next translated guest insn. Adjust the address backward to point to
323 the middle of the call insn. Subtracting one would do the job except for
324 several compressed mode architectures (arm, mips) which set the low bit
325 to indicate the compressed mode; subtracting two works around that. It
326 is also the case that there are no host isas that contain a call insn
327 smaller than 4 bytes, so we don't worry about special-casing this. */
328 #if defined(CONFIG_TCG_INTERPRETER)
334 #define GETPC() (GETRA() - GETPC_ADJ)
336 #if !defined(CONFIG_USER_ONLY)
338 void phys_mem_set_alloc(void *(*alloc)(size_t, uint64_t *align));
340 struct MemoryRegion *iotlb_to_region(AddressSpace *as, hwaddr index);
341 bool io_mem_read(struct MemoryRegion *mr, hwaddr addr,
342 uint64_t *pvalue, unsigned size);
343 bool io_mem_write(struct MemoryRegion *mr, hwaddr addr,
344 uint64_t value, unsigned size);
346 void tlb_fill(CPUState *cpu, target_ulong addr, int is_write, int mmu_idx,
351 #if defined(CONFIG_USER_ONLY)
352 static inline tb_page_addr_t get_page_addr_code(CPUArchState *env1, target_ulong addr)
358 tb_page_addr_t get_page_addr_code(CPUArchState *env1, target_ulong addr);
362 extern int singlestep;
365 extern volatile sig_atomic_t exit_request;
369 * @cpu: The CPU for which to check IO.
371 * Deterministic execution requires that IO only be performed on the last
372 * instruction of a TB so that interrupts take effect immediately.
374 * Returns: %true if memory-mapped IO is safe, %false otherwise.
376 static inline bool cpu_can_do_io(CPUState *cpu)
381 /* If not executing code then assume we are ok. */
382 if (cpu->current_tb == NULL) {
385 return cpu->can_do_io != 0;