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 208
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 4
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)
73 extern target_ulong gen_opc_pc[OPC_BUF_SIZE];
74 extern uint8_t gen_opc_instr_start[OPC_BUF_SIZE];
75 extern uint16_t gen_opc_icount[OPC_BUF_SIZE];
79 void gen_intermediate_code(CPUArchState *env, struct TranslationBlock *tb);
80 void gen_intermediate_code_pc(CPUArchState *env, struct TranslationBlock *tb);
81 void restore_state_to_opc(CPUArchState *env, struct TranslationBlock *tb,
84 void cpu_gen_init(void);
85 int cpu_gen_code(CPUArchState *env, struct TranslationBlock *tb,
86 int *gen_code_size_ptr);
87 int cpu_restore_state(struct TranslationBlock *tb,
88 CPUArchState *env, uintptr_t searched_pc);
89 void QEMU_NORETURN cpu_resume_from_signal(CPUArchState *env1, void *puc);
90 void QEMU_NORETURN cpu_io_recompile(CPUArchState *env, uintptr_t retaddr);
91 TranslationBlock *tb_gen_code(CPUArchState *env,
92 target_ulong pc, target_ulong cs_base, int flags,
94 void cpu_exec_init(CPUArchState *env);
95 void QEMU_NORETURN cpu_loop_exit(CPUArchState *env1);
96 int page_unprotect(target_ulong address, uintptr_t pc, void *puc);
97 void tb_invalidate_phys_page_range(tb_page_addr_t start, tb_page_addr_t end,
98 int is_cpu_write_access);
99 void tlb_flush_page(CPUArchState *env, target_ulong addr);
100 void tlb_flush(CPUArchState *env, int flush_global);
101 #if !defined(CONFIG_USER_ONLY)
102 void tlb_set_page(CPUArchState *env, target_ulong vaddr,
103 target_phys_addr_t paddr, int prot,
104 int mmu_idx, target_ulong size);
105 void tb_invalidate_phys_addr(target_phys_addr_t addr);
108 #define CODE_GEN_ALIGN 16 /* must be >= of the size of a icache line */
110 #define CODE_GEN_PHYS_HASH_BITS 15
111 #define CODE_GEN_PHYS_HASH_SIZE (1 << CODE_GEN_PHYS_HASH_BITS)
113 #define MIN_CODE_GEN_BUFFER_SIZE (1024 * 1024)
115 /* estimated block size for TB allocation */
116 /* XXX: use a per code average code fragment size and modulate it
117 according to the host CPU */
118 #if defined(CONFIG_SOFTMMU)
119 #define CODE_GEN_AVG_BLOCK_SIZE 128
121 #define CODE_GEN_AVG_BLOCK_SIZE 64
124 #if defined(_ARCH_PPC) || defined(__x86_64__) || defined(__arm__) || defined(__i386__)
125 #define USE_DIRECT_JUMP
126 #elif defined(CONFIG_TCG_INTERPRETER)
127 #define USE_DIRECT_JUMP
130 struct TranslationBlock {
131 target_ulong pc; /* simulated PC corresponding to this block (EIP + CS base) */
132 target_ulong cs_base; /* CS base for this block */
133 uint64_t flags; /* flags defining in which context the code was generated */
134 uint16_t size; /* size of target code for this block (1 <=
135 size <= TARGET_PAGE_SIZE) */
136 uint16_t cflags; /* compile flags */
137 #define CF_COUNT_MASK 0x7fff
138 #define CF_LAST_IO 0x8000 /* Last insn may be an IO access. */
140 uint8_t *tc_ptr; /* pointer to the translated code */
141 /* next matching tb for physical address. */
142 struct TranslationBlock *phys_hash_next;
143 /* first and second physical page containing code. The lower bit
144 of the pointer tells the index in page_next[] */
145 struct TranslationBlock *page_next[2];
146 tb_page_addr_t page_addr[2];
148 /* the following data are used to directly call another TB from
149 the code of this one. */
150 uint16_t tb_next_offset[2]; /* offset of original jump target */
151 #ifdef USE_DIRECT_JUMP
152 uint16_t tb_jmp_offset[2]; /* offset of jump instruction */
154 uintptr_t tb_next[2]; /* address of jump generated code */
156 /* list of TBs jumping to this one. This is a circular list using
157 the two least significant bits of the pointers to tell what is
158 the next pointer: 0 = jmp_next[0], 1 = jmp_next[1], 2 =
160 struct TranslationBlock *jmp_next[2];
161 struct TranslationBlock *jmp_first;
165 static inline unsigned int tb_jmp_cache_hash_page(target_ulong pc)
168 tmp = pc ^ (pc >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS));
169 return (tmp >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS)) & TB_JMP_PAGE_MASK;
172 static inline unsigned int tb_jmp_cache_hash_func(target_ulong pc)
175 tmp = pc ^ (pc >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS));
176 return (((tmp >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS)) & TB_JMP_PAGE_MASK)
177 | (tmp & TB_JMP_ADDR_MASK));
180 static inline unsigned int tb_phys_hash_func(tb_page_addr_t pc)
182 return (pc >> 2) & (CODE_GEN_PHYS_HASH_SIZE - 1);
185 void tb_free(TranslationBlock *tb);
186 void tb_flush(CPUArchState *env);
187 void tb_link_page(TranslationBlock *tb,
188 tb_page_addr_t phys_pc, tb_page_addr_t phys_page2);
189 void tb_phys_invalidate(TranslationBlock *tb, tb_page_addr_t page_addr);
191 extern TranslationBlock *tb_phys_hash[CODE_GEN_PHYS_HASH_SIZE];
193 #if defined(USE_DIRECT_JUMP)
195 #if defined(CONFIG_TCG_INTERPRETER)
196 static inline void tb_set_jmp_target1(uintptr_t jmp_addr, uintptr_t addr)
198 /* patch the branch destination */
199 *(uint32_t *)jmp_addr = addr - (jmp_addr + 4);
200 /* no need to flush icache explicitly */
202 #elif defined(_ARCH_PPC)
203 void ppc_tb_set_jmp_target(unsigned long jmp_addr, unsigned long addr);
204 #define tb_set_jmp_target1 ppc_tb_set_jmp_target
205 #elif defined(__i386__) || defined(__x86_64__)
206 static inline void tb_set_jmp_target1(uintptr_t jmp_addr, uintptr_t addr)
208 /* patch the branch destination */
209 *(uint32_t *)jmp_addr = addr - (jmp_addr + 4);
210 /* no need to flush icache explicitly */
212 #elif defined(__arm__)
213 static inline void tb_set_jmp_target1(uintptr_t jmp_addr, uintptr_t addr)
215 #if !QEMU_GNUC_PREREQ(4, 1)
216 register unsigned long _beg __asm ("a1");
217 register unsigned long _end __asm ("a2");
218 register unsigned long _flg __asm ("a3");
221 /* we could use a ldr pc, [pc, #-4] kind of branch and avoid the flush */
222 *(uint32_t *)jmp_addr =
223 (*(uint32_t *)jmp_addr & ~0xffffff)
224 | (((addr - (jmp_addr + 8)) >> 2) & 0xffffff);
226 #if QEMU_GNUC_PREREQ(4, 1)
227 __builtin___clear_cache((char *) jmp_addr, (char *) jmp_addr + 4);
233 __asm __volatile__ ("swi 0x9f0002" : : "r" (_beg), "r" (_end), "r" (_flg));
237 #error tb_set_jmp_target1 is missing
240 static inline void tb_set_jmp_target(TranslationBlock *tb,
241 int n, uintptr_t addr)
243 uint16_t offset = tb->tb_jmp_offset[n];
244 tb_set_jmp_target1((uintptr_t)(tb->tc_ptr + offset), addr);
249 /* set the jump target */
250 static inline void tb_set_jmp_target(TranslationBlock *tb,
251 int n, uintptr_t addr)
253 tb->tb_next[n] = addr;
258 static inline void tb_add_jump(TranslationBlock *tb, int n,
259 TranslationBlock *tb_next)
261 /* NOTE: this test is only needed for thread safety */
262 if (!tb->jmp_next[n]) {
263 /* patch the native jump address */
264 tb_set_jmp_target(tb, n, (uintptr_t)tb_next->tc_ptr);
266 /* add in TB jmp circular list */
267 tb->jmp_next[n] = tb_next->jmp_first;
268 tb_next->jmp_first = (TranslationBlock *)((uintptr_t)(tb) | (n));
272 TranslationBlock *tb_find_pc(uintptr_t pc_ptr);
274 #include "qemu-lock.h"
276 extern spinlock_t tb_lock;
278 extern int tb_invalidated_flag;
280 /* The return address may point to the start of the next instruction.
281 Subtracting one gets us the call instruction itself. */
282 #if defined(CONFIG_TCG_INTERPRETER)
283 /* Alpha and SH4 user mode emulations and Softmmu call GETPC().
284 For all others, GETPC remains undefined (which makes TCI a little faster. */
285 # if defined(CONFIG_SOFTMMU) || defined(TARGET_ALPHA) || defined(TARGET_SH4)
286 extern uintptr_t tci_tb_ptr;
287 # define GETPC() tci_tb_ptr
289 #elif defined(__s390__) && !defined(__s390x__)
291 (((uintptr_t)__builtin_return_address(0) & 0x7fffffffUL) - 1)
292 #elif defined(__arm__)
293 /* Thumb return addresses have the low bit set, so we need to subtract two.
294 This is still safe in ARM mode because instructions are 4 bytes. */
295 # define GETPC() ((uintptr_t)__builtin_return_address(0) - 2)
297 # define GETPC() ((uintptr_t)__builtin_return_address(0) - 1)
300 #if !defined(CONFIG_USER_ONLY)
302 struct MemoryRegion *iotlb_to_region(target_phys_addr_t index);
303 uint64_t io_mem_read(struct MemoryRegion *mr, target_phys_addr_t addr,
305 void io_mem_write(struct MemoryRegion *mr, target_phys_addr_t addr,
306 uint64_t value, unsigned size);
308 void tlb_fill(CPUArchState *env1, target_ulong addr, int is_write, int mmu_idx,
311 #include "softmmu_defs.h"
313 #define ACCESS_TYPE (NB_MMU_MODES + 1)
314 #define MEMSUFFIX _code
315 #ifndef CONFIG_TCG_PASS_AREG0
316 #define env cpu_single_env
320 #include "softmmu_header.h"
323 #include "softmmu_header.h"
326 #include "softmmu_header.h"
329 #include "softmmu_header.h"
337 #if defined(CONFIG_USER_ONLY)
338 static inline tb_page_addr_t get_page_addr_code(CPUArchState *env1, target_ulong addr)
343 tb_page_addr_t get_page_addr_code(CPUArchState *env1, target_ulong addr);
346 typedef void (CPUDebugExcpHandler)(CPUArchState *env);
348 CPUDebugExcpHandler *cpu_set_debug_excp_handler(CPUDebugExcpHandler *handler);
351 extern int singlestep;
354 extern volatile sig_atomic_t exit_request;
356 /* Deterministic execution requires that IO only be performed on the last
357 instruction of a TB so that interrupts take effect immediately. */
358 static inline int can_do_io(CPUArchState *env)
363 /* If not executing code then assume we are ok. */
364 if (!env->current_tb) {
367 return env->can_do_io != 0;