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 4
  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 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);
 106 #endif
 107
 108 #define CODE_GEN_ALIGN           16 /* must be >= of the size of a icache line */
 109
 110 #define CODE_GEN_PHYS_HASH_BITS     15
 111 #define CODE_GEN_PHYS_HASH_SIZE     (1 << CODE_GEN_PHYS_HASH_BITS)
 112
 113 #define MIN_CODE_GEN_BUFFER_SIZE     (1024 * 1024)
 114
 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
 120 #else
 121 #define CODE_GEN_AVG_BLOCK_SIZE 64
 122 #endif
 123
 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
 128 #endif
 129
 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.  */
 139
 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];
 147
 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 */
 153 #else
 154     uintptr_t tb_next[2]; /* address of jump generated code */
 155 #endif
 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 =
 159        jmp_first */
 160     struct TranslationBlock *jmp_next[2];
 161     struct TranslationBlock *jmp_first;
 162     uint32_t icount;
 163 };
 164
 165 static inline unsigned int tb_jmp_cache_hash_page(target_ulong pc)
 166 {
 167     target_ulong tmp;
 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;
 170 }
 171
 172 static inline unsigned int tb_jmp_cache_hash_func(target_ulong pc)
 173 {
 174     target_ulong tmp;
 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));
 178 }
 179
 180 static inline unsigned int tb_phys_hash_func(tb_page_addr_t pc)
 181 {
 182     return (pc >> 2) & (CODE_GEN_PHYS_HASH_SIZE - 1);
 183 }
 184
 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);
 190
 191 extern TranslationBlock *tb_phys_hash[CODE_GEN_PHYS_HASH_SIZE];
 192
 193 #if defined(USE_DIRECT_JUMP)
 194
 195 #if defined(CONFIG_TCG_INTERPRETER)
 196 static inline void tb_set_jmp_target1(uintptr_t jmp_addr, uintptr_t addr)
 197 {
 198     /* patch the branch destination */
 199     *(uint32_t *)jmp_addr = addr - (jmp_addr + 4);
 200     /* no need to flush icache explicitly */
 201 }
 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)
 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(__arm__)
 213 static inline void tb_set_jmp_target1(uintptr_t jmp_addr, uintptr_t addr)
 214 {
 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");
 219 #endif
 220
 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);
 225
 226 #if QEMU_GNUC_PREREQ(4, 1)
 227     __builtin___clear_cache((char *) jmp_addr, (char *) jmp_addr + 4);
 228 #else
 229     /* flush icache */
 230     _beg = jmp_addr;
 231     _end = jmp_addr + 4;
 232     _flg = 0;
 233     __asm __volatile__ ("swi 0x9f0002" : : "r" (_beg), "r" (_end), "r" (_flg));
 234 #endif
 235 }
 236 #else
 237 #error tb_set_jmp_target1 is missing
 238 #endif
 239
 240 static inline void tb_set_jmp_target(TranslationBlock *tb,
 241                                      int n, uintptr_t addr)
 242 {
 243     uint16_t offset = tb->tb_jmp_offset[n];
 244     tb_set_jmp_target1((uintptr_t)(tb->tc_ptr + offset), addr);
 245 }
 246
 247 #else
 248
 249 /* set the jump target */
 250 static inline void tb_set_jmp_target(TranslationBlock *tb,
 251                                      int n, uintptr_t addr)
 252 {
 253     tb->tb_next[n] = addr;
 254 }
 255
 256 #endif
 257
 258 static inline void tb_add_jump(TranslationBlock *tb, int n,
 259                                TranslationBlock *tb_next)
 260 {
 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);
 265
 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));
 269     }
 270 }
 271
 272 TranslationBlock *tb_find_pc(uintptr_t pc_ptr);
 273
 274 #include "qemu-lock.h"
 275
 276 extern spinlock_t tb_lock;
 277
 278 extern int tb_invalidated_flag;
 279
 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 void *tci_tb_ptr;
 287 #  define GETPC() tci_tb_ptr
 288 # endif
 289 #elif defined(__s390__) && !defined(__s390x__)
 290 # define GETPC() \
 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)
 296 #else
 297 # define GETPC() ((uintptr_t)__builtin_return_address(0) - 1)
 298 #endif
 299
 300 #if !defined(CONFIG_USER_ONLY)
 301
 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,
 304                      unsigned size);
 305 void io_mem_write(struct MemoryRegion *mr, target_phys_addr_t addr,
 306                   uint64_t value, unsigned size);
 307
 308 void tlb_fill(CPUArchState *env1, target_ulong addr, int is_write, int mmu_idx,
 309               uintptr_t retaddr);
 310
 311 #include "softmmu_defs.h"
 312
 313 #define ACCESS_TYPE (NB_MMU_MODES + 1)
 314 #define MEMSUFFIX _code
 315 #ifndef CONFIG_TCG_PASS_AREG0
 316 #define env cpu_single_env
 317 #endif
 318
 319 #define DATA_SIZE 1
 320 #include "softmmu_header.h"
 321
 322 #define DATA_SIZE 2
 323 #include "softmmu_header.h"
 324
 325 #define DATA_SIZE 4
 326 #include "softmmu_header.h"
 327
 328 #define DATA_SIZE 8
 329 #include "softmmu_header.h"
 330
 331 #undef ACCESS_TYPE
 332 #undef MEMSUFFIX
 333 #undef env
 334
 335 #endif
 336
 337 #if defined(CONFIG_USER_ONLY)
 338 static inline tb_page_addr_t get_page_addr_code(CPUArchState *env1, target_ulong addr)
 339 {
 340     return addr;
 341 }
 342 #else
 343 tb_page_addr_t get_page_addr_code(CPUArchState *env1, target_ulong addr);
 344 #endif
 345
 346 typedef void (CPUDebugExcpHandler)(CPUArchState *env);
 347
 348 CPUDebugExcpHandler *cpu_set_debug_excp_handler(CPUDebugExcpHandler *handler);
 349
 350 /* vl.c */
 351 extern int singlestep;
 352
 353 /* cpu-exec.c */
 354 extern volatile sig_atomic_t exit_request;
 355
 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)
 359 {
 360     if (!use_icount) {
 361         return 1;
 362     }
 363     /* If not executing code then assume we are ok.  */
 364     if (!env->current_tb) {
 365         return 1;
 366     }
 367     return env->can_do_io != 0;
 368 }
 369
 370 #endif