exec-all.h

   1 /*
   2  * internal execution defines for qemu
   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
  20 #ifndef _EXEC_ALL_H_
  21 #define _EXEC_ALL_H_
  22
  23 #include "qemu-common.h"
  24
  25 /* allow to see translation results - the slowdown should be negligible, so we leave it */
  26 #define DEBUG_DISAS
  27
  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
  30    type.  */
  31 #if defined(CONFIG_USER_ONLY)
  32 typedef abi_ulong tb_page_addr_t;
  33 #else
  34 typedef ram_addr_t tb_page_addr_t;
  35 #endif
  36
  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 */
  42
  43 struct TranslationBlock;
  44 typedef struct TranslationBlock TranslationBlock;
  45
  46 /* XXX: make safe guess about sizes */
  47 #define MAX_OP_PER_INSTR 208
  48
  49 #if HOST_LONG_BITS == 32
  50 #define MAX_OPC_PARAM_PER_ARG 2
  51 #else
  52 #define MAX_OPC_PARAM_PER_ARG 1
  53 #endif
  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)
  57
  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)
  64
  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
  70
  71 #define OPPARAM_BUF_SIZE (OPC_BUF_SIZE * MAX_OPC_PARAM)
  72
  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];
  76
  77 #include "qemu-log.h"
  78
  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,
  82                           int pc_pos);
  83
  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,
  93                               int cflags);
  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 tb_invalidate_phys_range(tb_page_addr_t start, tb_page_addr_t end,
 100                               int is_cpu_write_access);
 101 #if !defined(CONFIG_USER_ONLY)
 102 /* cputlb.c */
 103 void tlb_flush_page(CPUArchState *env, target_ulong addr);
 104 void tlb_flush(CPUArchState *env, int flush_global);
 105 void tlb_set_page(CPUArchState *env, target_ulong vaddr,
 106                   hwaddr paddr, int prot,
 107                   int mmu_idx, target_ulong size);
 108 void tb_invalidate_phys_addr(hwaddr addr);
 109 #else
 110 static inline void tlb_flush_page(CPUArchState *env, target_ulong addr)
 111 {
 112 }
 113
 114 static inline void tlb_flush(CPUArchState *env, int flush_global)
 115 {
 116 }
 117 #endif
 118
 119 #define CODE_GEN_ALIGN           16 /* must be >= of the size of a icache line */
 120
 121 #define CODE_GEN_PHYS_HASH_BITS     15
 122 #define CODE_GEN_PHYS_HASH_SIZE     (1 << CODE_GEN_PHYS_HASH_BITS)
 123
 124 /* estimated block size for TB allocation */
 125 /* XXX: use a per code average code fragment size and modulate it
 126    according to the host CPU */
 127 #if defined(CONFIG_SOFTMMU)
 128 #define CODE_GEN_AVG_BLOCK_SIZE 128
 129 #else
 130 #define CODE_GEN_AVG_BLOCK_SIZE 64
 131 #endif
 132
 133 #if defined(__arm__) || defined(_ARCH_PPC) \
 134     || defined(__x86_64__) || defined(__i386__) \
 135     || defined(__sparc__) \
 136     || defined(CONFIG_TCG_INTERPRETER)
 137 #define USE_DIRECT_JUMP
 138 #endif
 139
 140 struct TranslationBlock {
 141     target_ulong pc;   /* simulated PC corresponding to this block (EIP + CS base) */
 142     target_ulong cs_base; /* CS base for this block */
 143     uint64_t flags; /* flags defining in which context the code was generated */
 144     uint16_t size;      /* size of target code for this block (1 <=
 145                            size <= TARGET_PAGE_SIZE) */
 146     uint16_t cflags;    /* compile flags */
 147 #define CF_COUNT_MASK  0x7fff
 148 #define CF_LAST_IO     0x8000 /* Last insn may be an IO access.  */
 149
 150     uint8_t *tc_ptr;    /* pointer to the translated code */
 151     /* next matching tb for physical address. */
 152     struct TranslationBlock *phys_hash_next;
 153     /* first and second physical page containing code. The lower bit
 154        of the pointer tells the index in page_next[] */
 155     struct TranslationBlock *page_next[2];
 156     tb_page_addr_t page_addr[2];
 157
 158     /* the following data are used to directly call another TB from
 159        the code of this one. */
 160     uint16_t tb_next_offset[2]; /* offset of original jump target */
 161 #ifdef USE_DIRECT_JUMP
 162     uint16_t tb_jmp_offset[2]; /* offset of jump instruction */
 163 #else
 164     uintptr_t tb_next[2]; /* address of jump generated code */
 165 #endif
 166     /* list of TBs jumping to this one. This is a circular list using
 167        the two least significant bits of the pointers to tell what is
 168        the next pointer: 0 = jmp_next[0], 1 = jmp_next[1], 2 =
 169        jmp_first */
 170     struct TranslationBlock *jmp_next[2];
 171     struct TranslationBlock *jmp_first;
 172     uint32_t icount;
 173 };
 174
 175 static inline unsigned int tb_jmp_cache_hash_page(target_ulong pc)
 176 {
 177     target_ulong tmp;
 178     tmp = pc ^ (pc >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS));
 179     return (tmp >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS)) & TB_JMP_PAGE_MASK;
 180 }
 181
 182 static inline unsigned int tb_jmp_cache_hash_func(target_ulong pc)
 183 {
 184     target_ulong tmp;
 185     tmp = pc ^ (pc >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS));
 186     return (((tmp >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS)) & TB_JMP_PAGE_MASK)
 187             | (tmp & TB_JMP_ADDR_MASK));
 188 }
 189
 190 static inline unsigned int tb_phys_hash_func(tb_page_addr_t pc)
 191 {
 192     return (pc >> 2) & (CODE_GEN_PHYS_HASH_SIZE - 1);
 193 }
 194
 195 void tb_free(TranslationBlock *tb);
 196 void tb_flush(CPUArchState *env);
 197 void tb_link_page(TranslationBlock *tb,
 198                   tb_page_addr_t phys_pc, tb_page_addr_t phys_page2);
 199 void tb_phys_invalidate(TranslationBlock *tb, tb_page_addr_t page_addr);
 200
 201 extern TranslationBlock *tb_phys_hash[CODE_GEN_PHYS_HASH_SIZE];
 202
 203 #if defined(USE_DIRECT_JUMP)
 204
 205 #if defined(CONFIG_TCG_INTERPRETER)
 206 static inline void tb_set_jmp_target1(uintptr_t jmp_addr, uintptr_t addr)
 207 {
 208     /* patch the branch destination */
 209     *(uint32_t *)jmp_addr = addr - (jmp_addr + 4);
 210     /* no need to flush icache explicitly */
 211 }
 212 #elif defined(_ARCH_PPC)
 213 void ppc_tb_set_jmp_target(unsigned long jmp_addr, unsigned long addr);
 214 #define tb_set_jmp_target1 ppc_tb_set_jmp_target
 215 #elif defined(__i386__) || defined(__x86_64__)
 216 static inline void tb_set_jmp_target1(uintptr_t jmp_addr, uintptr_t addr)
 217 {
 218     /* patch the branch destination */
 219     *(uint32_t *)jmp_addr = addr - (jmp_addr + 4);
 220     /* no need to flush icache explicitly */
 221 }
 222 #elif defined(__arm__)
 223 static inline void tb_set_jmp_target1(uintptr_t jmp_addr, uintptr_t addr)
 224 {
 225 #if !QEMU_GNUC_PREREQ(4, 1)
 226     register unsigned long _beg __asm ("a1");
 227     register unsigned long _end __asm ("a2");
 228     register unsigned long _flg __asm ("a3");
 229 #endif
 230
 231     /* we could use a ldr pc, [pc, #-4] kind of branch and avoid the flush */
 232     *(uint32_t *)jmp_addr =
 233         (*(uint32_t *)jmp_addr & ~0xffffff)
 234         | (((addr - (jmp_addr + 8)) >> 2) & 0xffffff);
 235
 236 #if QEMU_GNUC_PREREQ(4, 1)
 237     __builtin___clear_cache((char *) jmp_addr, (char *) jmp_addr + 4);
 238 #else
 239     /* flush icache */
 240     _beg = jmp_addr;
 241     _end = jmp_addr + 4;
 242     _flg = 0;
 243     __asm __volatile__ ("swi 0x9f0002" : : "r" (_beg), "r" (_end), "r" (_flg));
 244 #endif
 245 }
 246 #elif defined(__sparc__)
 247 void tb_set_jmp_target1(uintptr_t jmp_addr, uintptr_t addr);
 248 #else
 249 #error tb_set_jmp_target1 is missing
 250 #endif
 251
 252 static inline void tb_set_jmp_target(TranslationBlock *tb,
 253                                      int n, uintptr_t addr)
 254 {
 255     uint16_t offset = tb->tb_jmp_offset[n];
 256     tb_set_jmp_target1((uintptr_t)(tb->tc_ptr + offset), addr);
 257 }
 258
 259 #else
 260
 261 /* set the jump target */
 262 static inline void tb_set_jmp_target(TranslationBlock *tb,
 263                                      int n, uintptr_t addr)
 264 {
 265     tb->tb_next[n] = addr;
 266 }
 267
 268 #endif
 269
 270 static inline void tb_add_jump(TranslationBlock *tb, int n,
 271                                TranslationBlock *tb_next)
 272 {
 273     /* NOTE: this test is only needed for thread safety */
 274     if (!tb->jmp_next[n]) {
 275         /* patch the native jump address */
 276         tb_set_jmp_target(tb, n, (uintptr_t)tb_next->tc_ptr);
 277
 278         /* add in TB jmp circular list */
 279         tb->jmp_next[n] = tb_next->jmp_first;
 280         tb_next->jmp_first = (TranslationBlock *)((uintptr_t)(tb) | (n));
 281     }
 282 }
 283
 284 TranslationBlock *tb_find_pc(uintptr_t pc_ptr);
 285
 286 #include "qemu-lock.h"
 287
 288 extern spinlock_t tb_lock;
 289
 290 extern int tb_invalidated_flag;
 291
 292 /* The return address may point to the start of the next instruction.
 293    Subtracting one gets us the call instruction itself.  */
 294 #if defined(CONFIG_TCG_INTERPRETER)
 295 /* Alpha and SH4 user mode emulations and Softmmu call GETPC().
 296    For all others, GETPC remains undefined (which makes TCI a little faster. */
 297 # if defined(CONFIG_SOFTMMU) || defined(TARGET_ALPHA) || defined(TARGET_SH4) \
 298      || defined(TARGET_SPARC)
 299 extern uintptr_t tci_tb_ptr;
 300 #  define GETPC() tci_tb_ptr
 301 # endif
 302 #elif defined(__s390__) && !defined(__s390x__)
 303 # define GETPC() \
 304     (((uintptr_t)__builtin_return_address(0) & 0x7fffffffUL) - 1)
 305 #elif defined(__arm__)
 306 /* Thumb return addresses have the low bit set, so we need to subtract two.
 307    This is still safe in ARM mode because instructions are 4 bytes.  */
 308 # define GETPC() ((uintptr_t)__builtin_return_address(0) - 2)
 309 #else
 310 # define GETPC() ((uintptr_t)__builtin_return_address(0) - 1)
 311 #endif
 312
 313 #if !defined(CONFIG_USER_ONLY)
 314
 315 struct MemoryRegion *iotlb_to_region(hwaddr index);
 316 uint64_t io_mem_read(struct MemoryRegion *mr, hwaddr addr,
 317                      unsigned size);
 318 void io_mem_write(struct MemoryRegion *mr, hwaddr addr,
 319                   uint64_t value, unsigned size);
 320
 321 void tlb_fill(CPUArchState *env1, target_ulong addr, int is_write, int mmu_idx,
 322               uintptr_t retaddr);
 323
 324 #include "softmmu_defs.h"
 325
 326 #define ACCESS_TYPE (NB_MMU_MODES + 1)
 327 #define MEMSUFFIX _code
 328
 329 #define DATA_SIZE 1
 330 #include "softmmu_header.h"
 331
 332 #define DATA_SIZE 2
 333 #include "softmmu_header.h"
 334
 335 #define DATA_SIZE 4
 336 #include "softmmu_header.h"
 337
 338 #define DATA_SIZE 8
 339 #include "softmmu_header.h"
 340
 341 #undef ACCESS_TYPE
 342 #undef MEMSUFFIX
 343
 344 #endif
 345
 346 #if defined(CONFIG_USER_ONLY)
 347 static inline tb_page_addr_t get_page_addr_code(CPUArchState *env1, target_ulong addr)
 348 {
 349     return addr;
 350 }
 351 #else
 352 /* cputlb.c */
 353 tb_page_addr_t get_page_addr_code(CPUArchState *env1, target_ulong addr);
 354 #endif
 355
 356 typedef void (CPUDebugExcpHandler)(CPUArchState *env);
 357
 358 void cpu_set_debug_excp_handler(CPUDebugExcpHandler *handler);
 359
 360 /* vl.c */
 361 extern int singlestep;
 362
 363 /* cpu-exec.c */
 364 extern volatile sig_atomic_t exit_request;
 365
 366 /* Deterministic execution requires that IO only be performed on the last
 367    instruction of a TB so that interrupts take effect immediately.  */
 368 static inline int can_do_io(CPUArchState *env)
 369 {
 370     if (!use_icount) {
 371         return 1;
 372     }
 373     /* If not executing code then assume we are ok.  */
 374     if (!env->current_tb) {
 375         return 1;
 376     }
 377     return env->can_do_io != 0;
 378 }
 379
 380 #endif