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                   target_phys_addr_t paddr, int prot,
 107                   int mmu_idx, target_ulong size);
 108 void tb_invalidate_phys_addr(target_phys_addr_t 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 #define MIN_CODE_GEN_BUFFER_SIZE     (1024 * 1024)
 125
 126 /* estimated block size for TB allocation */
 127 /* XXX: use a per code average code fragment size and modulate it
 128    according to the host CPU */
 129 #if defined(CONFIG_SOFTMMU)
 130 #define CODE_GEN_AVG_BLOCK_SIZE 128
 131 #else
 132 #define CODE_GEN_AVG_BLOCK_SIZE 64
 133 #endif
 134
 135 #if defined(__arm__) || defined(_ARCH_PPC) \
 136     || defined(__x86_64__) || defined(__i386__) \
 137     || defined(__sparc__) \
 138     || defined(CONFIG_TCG_INTERPRETER)
 139 #define USE_DIRECT_JUMP
 140 #endif
 141
 142 struct TranslationBlock {
 143     target_ulong pc;   /* simulated PC corresponding to this block (EIP + CS base) */
 144     target_ulong cs_base; /* CS base for this block */
 145     uint64_t flags; /* flags defining in which context the code was generated */
 146     uint16_t size;      /* size of target code for this block (1 <=
 147                            size <= TARGET_PAGE_SIZE) */
 148     uint16_t cflags;    /* compile flags */
 149 #define CF_COUNT_MASK  0x7fff
 150 #define CF_LAST_IO     0x8000 /* Last insn may be an IO access.  */
 151
 152     uint8_t *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];
 159
 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 */
 165 #else
 166     uintptr_t tb_next[2]; /* address of jump generated code */
 167 #endif
 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 =
 171        jmp_first */
 172     struct TranslationBlock *jmp_next[2];
 173     struct TranslationBlock *jmp_first;
 174     uint32_t icount;
 175 };
 176
 177 static inline unsigned int tb_jmp_cache_hash_page(target_ulong pc)
 178 {
 179     target_ulong tmp;
 180     tmp = pc ^ (pc >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS));
 181     return (tmp >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS)) & TB_JMP_PAGE_MASK;
 182 }
 183
 184 static inline unsigned int tb_jmp_cache_hash_func(target_ulong pc)
 185 {
 186     target_ulong tmp;
 187     tmp = pc ^ (pc >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS));
 188     return (((tmp >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS)) & TB_JMP_PAGE_MASK)
 189             | (tmp & TB_JMP_ADDR_MASK));
 190 }
 191
 192 static inline unsigned int tb_phys_hash_func(tb_page_addr_t pc)
 193 {
 194     return (pc >> 2) & (CODE_GEN_PHYS_HASH_SIZE - 1);
 195 }
 196
 197 void tb_free(TranslationBlock *tb);
 198 void tb_flush(CPUArchState *env);
 199 void tb_link_page(TranslationBlock *tb,
 200                   tb_page_addr_t phys_pc, tb_page_addr_t phys_page2);
 201 void tb_phys_invalidate(TranslationBlock *tb, tb_page_addr_t page_addr);
 202
 203 extern TranslationBlock *tb_phys_hash[CODE_GEN_PHYS_HASH_SIZE];
 204
 205 #if defined(USE_DIRECT_JUMP)
 206
 207 #if defined(CONFIG_TCG_INTERPRETER)
 208 static inline void tb_set_jmp_target1(uintptr_t jmp_addr, uintptr_t addr)
 209 {
 210     /* patch the branch destination */
 211     *(uint32_t *)jmp_addr = addr - (jmp_addr + 4);
 212     /* no need to flush icache explicitly */
 213 }
 214 #elif defined(_ARCH_PPC)
 215 void ppc_tb_set_jmp_target(unsigned long jmp_addr, unsigned long addr);
 216 #define tb_set_jmp_target1 ppc_tb_set_jmp_target
 217 #elif defined(__i386__) || defined(__x86_64__)
 218 static inline void tb_set_jmp_target1(uintptr_t jmp_addr, uintptr_t addr)
 219 {
 220     /* patch the branch destination */
 221     *(uint32_t *)jmp_addr = addr - (jmp_addr + 4);
 222     /* no need to flush icache explicitly */
 223 }
 224 #elif defined(__arm__)
 225 static inline void tb_set_jmp_target1(uintptr_t jmp_addr, uintptr_t addr)
 226 {
 227 #if !QEMU_GNUC_PREREQ(4, 1)
 228     register unsigned long _beg __asm ("a1");
 229     register unsigned long _end __asm ("a2");
 230     register unsigned long _flg __asm ("a3");
 231 #endif
 232
 233     /* we could use a ldr pc, [pc, #-4] kind of branch and avoid the flush */
 234     *(uint32_t *)jmp_addr =
 235         (*(uint32_t *)jmp_addr & ~0xffffff)
 236         | (((addr - (jmp_addr + 8)) >> 2) & 0xffffff);
 237
 238 #if QEMU_GNUC_PREREQ(4, 1)
 239     __builtin___clear_cache((char *) jmp_addr, (char *) jmp_addr + 4);
 240 #else
 241     /* flush icache */
 242     _beg = jmp_addr;
 243     _end = jmp_addr + 4;
 244     _flg = 0;
 245     __asm __volatile__ ("swi 0x9f0002" : : "r" (_beg), "r" (_end), "r" (_flg));
 246 #endif
 247 }
 248 #elif defined(__sparc__)
 249 void tb_set_jmp_target1(uintptr_t jmp_addr, uintptr_t addr);
 250 #else
 251 #error tb_set_jmp_target1 is missing
 252 #endif
 253
 254 static inline void tb_set_jmp_target(TranslationBlock *tb,
 255                                      int n, uintptr_t addr)
 256 {
 257     uint16_t offset = tb->tb_jmp_offset[n];
 258     tb_set_jmp_target1((uintptr_t)(tb->tc_ptr + offset), addr);
 259 }
 260
 261 #else
 262
 263 /* set the jump target */
 264 static inline void tb_set_jmp_target(TranslationBlock *tb,
 265                                      int n, uintptr_t addr)
 266 {
 267     tb->tb_next[n] = addr;
 268 }
 269
 270 #endif
 271
 272 static inline void tb_add_jump(TranslationBlock *tb, int n,
 273                                TranslationBlock *tb_next)
 274 {
 275     /* NOTE: this test is only needed for thread safety */
 276     if (!tb->jmp_next[n]) {
 277         /* patch the native jump address */
 278         tb_set_jmp_target(tb, n, (uintptr_t)tb_next->tc_ptr);
 279
 280         /* add in TB jmp circular list */
 281         tb->jmp_next[n] = tb_next->jmp_first;
 282         tb_next->jmp_first = (TranslationBlock *)((uintptr_t)(tb) | (n));
 283     }
 284 }
 285
 286 TranslationBlock *tb_find_pc(uintptr_t pc_ptr);
 287
 288 #include "qemu-lock.h"
 289
 290 extern spinlock_t tb_lock;
 291
 292 extern int tb_invalidated_flag;
 293
 294 /* The return address may point to the start of the next instruction.
 295    Subtracting one gets us the call instruction itself.  */
 296 #if defined(CONFIG_TCG_INTERPRETER)
 297 /* Alpha and SH4 user mode emulations and Softmmu call GETPC().
 298    For all others, GETPC remains undefined (which makes TCI a little faster. */
 299 # if defined(CONFIG_SOFTMMU) || defined(TARGET_ALPHA) || defined(TARGET_SH4)
 300 extern uintptr_t tci_tb_ptr;
 301 #  define GETPC() tci_tb_ptr
 302 # endif
 303 #elif defined(__s390__) && !defined(__s390x__)
 304 # define GETPC() \
 305     (((uintptr_t)__builtin_return_address(0) & 0x7fffffffUL) - 1)
 306 #elif defined(__arm__)
 307 /* Thumb return addresses have the low bit set, so we need to subtract two.
 308    This is still safe in ARM mode because instructions are 4 bytes.  */
 309 # define GETPC() ((uintptr_t)__builtin_return_address(0) - 2)
 310 #else
 311 # define GETPC() ((uintptr_t)__builtin_return_address(0) - 1)
 312 #endif
 313
 314 #if !defined(CONFIG_USER_ONLY)
 315
 316 struct MemoryRegion *iotlb_to_region(target_phys_addr_t index);
 317 uint64_t io_mem_read(struct MemoryRegion *mr, target_phys_addr_t addr,
 318                      unsigned size);
 319 void io_mem_write(struct MemoryRegion *mr, target_phys_addr_t addr,
 320                   uint64_t value, unsigned size);
 321
 322 void tlb_fill(CPUArchState *env1, target_ulong addr, int is_write, int mmu_idx,
 323               uintptr_t retaddr);
 324
 325 #include "softmmu_defs.h"
 326
 327 #define ACCESS_TYPE (NB_MMU_MODES + 1)
 328 #define MEMSUFFIX _code
 329
 330 #define DATA_SIZE 1
 331 #include "softmmu_header.h"
 332
 333 #define DATA_SIZE 2
 334 #include "softmmu_header.h"
 335
 336 #define DATA_SIZE 4
 337 #include "softmmu_header.h"
 338
 339 #define DATA_SIZE 8
 340 #include "softmmu_header.h"
 341
 342 #undef ACCESS_TYPE
 343 #undef MEMSUFFIX
 344
 345 #endif
 346
 347 #if defined(CONFIG_USER_ONLY)
 348 static inline tb_page_addr_t get_page_addr_code(CPUArchState *env1, target_ulong addr)
 349 {
 350     return addr;
 351 }
 352 #else
 353 /* cputlb.c */
 354 tb_page_addr_t get_page_addr_code(CPUArchState *env1, target_ulong addr);
 355 #endif
 356
 357 typedef void (CPUDebugExcpHandler)(CPUArchState *env);
 358
 359 void cpu_set_debug_excp_handler(CPUDebugExcpHandler *handler);
 360
 361 /* vl.c */
 362 extern int singlestep;
 363
 364 /* cpu-exec.c */
 365 extern volatile sig_atomic_t exit_request;
 366
 367 /* Deterministic execution requires that IO only be performed on the last
 368    instruction of a TB so that interrupts take effect immediately.  */
 369 static inline int can_do_io(CPUArchState *env)
 370 {
 371     if (!use_icount) {
 372         return 1;
 373     }
 374     /* If not executing code then assume we are ok.  */
 375     if (!env->current_tb) {
 376         return 1;
 377     }
 378     return env->can_do_io != 0;
 379 }
 380
 381 #endif