include/exec/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 #include "exec/tb-context.h"
  25
  26 /* allow to see translation results - the slowdown should be negligible, so we leave it */
  27 #define DEBUG_DISAS
  28
  29 /* Page tracking code uses ram addresses in system mode, and virtual
  30    addresses in userspace mode.  Define tb_page_addr_t to be an appropriate
  31    type.  */
  32 #if defined(CONFIG_USER_ONLY)
  33 typedef abi_ulong tb_page_addr_t;
  34 #else
  35 typedef ram_addr_t tb_page_addr_t;
  36 #endif
  37
  38 /* is_jmp field values */
  39 #define DISAS_NEXT    0 /* next instruction can be analyzed */
  40 #define DISAS_JUMP    1 /* only pc was modified dynamically */
  41 #define DISAS_UPDATE  2 /* cpu state was modified dynamically */
  42 #define DISAS_TB_JUMP 3 /* only pc was modified statically */
  43
  44 #include "qemu/log.h"
  45
  46 void gen_intermediate_code(CPUArchState *env, struct TranslationBlock *tb);
  47 void restore_state_to_opc(CPUArchState *env, struct TranslationBlock *tb,
  48                           target_ulong *data);
  49
  50 void cpu_gen_init(void);
  51 bool cpu_restore_state(CPUState *cpu, uintptr_t searched_pc);
  52
  53 void QEMU_NORETURN cpu_loop_exit_noexc(CPUState *cpu);
  54 void QEMU_NORETURN cpu_io_recompile(CPUState *cpu, uintptr_t retaddr);
  55 TranslationBlock *tb_gen_code(CPUState *cpu,
  56                               target_ulong pc, target_ulong cs_base,
  57                               uint32_t flags,
  58                               int cflags);
  59
  60 void QEMU_NORETURN cpu_loop_exit(CPUState *cpu);
  61 void QEMU_NORETURN cpu_loop_exit_restore(CPUState *cpu, uintptr_t pc);
  62
  63 #if !defined(CONFIG_USER_ONLY)
  64 void cpu_reloading_memory_map(void);
  65 /**
  66  * cpu_address_space_init:
  67  * @cpu: CPU to add this address space to
  68  * @as: address space to add
  69  * @asidx: integer index of this address space
  70  *
  71  * Add the specified address space to the CPU's cpu_ases list.
  72  * The address space added with @asidx 0 is the one used for the
  73  * convenience pointer cpu->as.
  74  * The target-specific code which registers ASes is responsible
  75  * for defining what semantics address space 0, 1, 2, etc have.
  76  *
  77  * Before the first call to this function, the caller must set
  78  * cpu->num_ases to the total number of address spaces it needs
  79  * to support.
  80  *
  81  * Note that with KVM only one address space is supported.
  82  */
  83 void cpu_address_space_init(CPUState *cpu, AddressSpace *as, int asidx);
  84 /* cputlb.c */
  85 /**
  86  * tlb_flush_page:
  87  * @cpu: CPU whose TLB should be flushed
  88  * @addr: virtual address of page to be flushed
  89  *
  90  * Flush one page from the TLB of the specified CPU, for all
  91  * MMU indexes.
  92  */
  93 void tlb_flush_page(CPUState *cpu, target_ulong addr);
  94 /**
  95  * tlb_flush:
  96  * @cpu: CPU whose TLB should be flushed
  97  * @flush_global: ignored
  98  *
  99  * Flush the entire TLB for the specified CPU.
 100  * The flush_global flag is in theory an indicator of whether the whole
 101  * TLB should be flushed, or only those entries not marked global.
 102  * In practice QEMU does not implement any global/not global flag for
 103  * TLB entries, and the argument is ignored.
 104  */
 105 void tlb_flush(CPUState *cpu, int flush_global);
 106 /**
 107  * tlb_flush_page_by_mmuidx:
 108  * @cpu: CPU whose TLB should be flushed
 109  * @addr: virtual address of page to be flushed
 110  * @...: list of MMU indexes to flush, terminated by a negative value
 111  *
 112  * Flush one page from the TLB of the specified CPU, for the specified
 113  * MMU indexes.
 114  */
 115 void tlb_flush_page_by_mmuidx(CPUState *cpu, target_ulong addr, ...);
 116 /**
 117  * tlb_flush_by_mmuidx:
 118  * @cpu: CPU whose TLB should be flushed
 119  * @...: list of MMU indexes to flush, terminated by a negative value
 120  *
 121  * Flush all entries from the TLB of the specified CPU, for the specified
 122  * MMU indexes.
 123  */
 124 void tlb_flush_by_mmuidx(CPUState *cpu, ...);
 125 /**
 126  * tlb_set_page_with_attrs:
 127  * @cpu: CPU to add this TLB entry for
 128  * @vaddr: virtual address of page to add entry for
 129  * @paddr: physical address of the page
 130  * @attrs: memory transaction attributes
 131  * @prot: access permissions (PAGE_READ/PAGE_WRITE/PAGE_EXEC bits)
 132  * @mmu_idx: MMU index to insert TLB entry for
 133  * @size: size of the page in bytes
 134  *
 135  * Add an entry to this CPU's TLB (a mapping from virtual address
 136  * @vaddr to physical address @paddr) with the specified memory
 137  * transaction attributes. This is generally called by the target CPU
 138  * specific code after it has been called through the tlb_fill()
 139  * entry point and performed a successful page table walk to find
 140  * the physical address and attributes for the virtual address
 141  * which provoked the TLB miss.
 142  *
 143  * At most one entry for a given virtual address is permitted. Only a
 144  * single TARGET_PAGE_SIZE region is mapped; the supplied @size is only
 145  * used by tlb_flush_page.
 146  */
 147 void tlb_set_page_with_attrs(CPUState *cpu, target_ulong vaddr,
 148                              hwaddr paddr, MemTxAttrs attrs,
 149                              int prot, int mmu_idx, target_ulong size);
 150 /* tlb_set_page:
 151  *
 152  * This function is equivalent to calling tlb_set_page_with_attrs()
 153  * with an @attrs argument of MEMTXATTRS_UNSPECIFIED. It's provided
 154  * as a convenience for CPUs which don't use memory transaction attributes.
 155  */
 156 void tlb_set_page(CPUState *cpu, target_ulong vaddr,
 157                   hwaddr paddr, int prot,
 158                   int mmu_idx, target_ulong size);
 159 void tb_invalidate_phys_addr(AddressSpace *as, hwaddr addr);
 160 void probe_write(CPUArchState *env, target_ulong addr, int mmu_idx,
 161                  uintptr_t retaddr);
 162 #else
 163 static inline void tlb_flush_page(CPUState *cpu, target_ulong addr)
 164 {
 165 }
 166
 167 static inline void tlb_flush(CPUState *cpu, int flush_global)
 168 {
 169 }
 170
 171 static inline void tlb_flush_page_by_mmuidx(CPUState *cpu,
 172                                             target_ulong addr, ...)
 173 {
 174 }
 175
 176 static inline void tlb_flush_by_mmuidx(CPUState *cpu, ...)
 177 {
 178 }
 179 #endif
 180
 181 #define CODE_GEN_ALIGN           16 /* must be >= of the size of a icache line */
 182
 183 /* Estimated block size for TB allocation.  */
 184 /* ??? The following is based on a 2015 survey of x86_64 host output.
 185    Better would seem to be some sort of dynamically sized TB array,
 186    adapting to the block sizes actually being produced.  */
 187 #if defined(CONFIG_SOFTMMU)
 188 #define CODE_GEN_AVG_BLOCK_SIZE 400
 189 #else
 190 #define CODE_GEN_AVG_BLOCK_SIZE 150
 191 #endif
 192
 193 #if defined(__arm__) || defined(_ARCH_PPC) \
 194     || defined(__x86_64__) || defined(__i386__) \
 195     || defined(__sparc__) || defined(__aarch64__) \
 196     || defined(__s390x__) || defined(__mips__) \
 197     || defined(CONFIG_TCG_INTERPRETER)
 198 /* NOTE: Direct jump patching must be atomic to be thread-safe. */
 199 #define USE_DIRECT_JUMP
 200 #endif
 201
 202 struct TranslationBlock {
 203     target_ulong pc;   /* simulated PC corresponding to this block (EIP + CS base) */
 204     target_ulong cs_base; /* CS base for this block */
 205     uint32_t flags; /* flags defining in which context the code was generated */
 206     uint16_t size;      /* size of target code for this block (1 <=
 207                            size <= TARGET_PAGE_SIZE) */
 208     uint16_t icount;
 209     uint32_t cflags;    /* compile flags */
 210 #define CF_COUNT_MASK  0x7fff
 211 #define CF_LAST_IO     0x8000 /* Last insn may be an IO access.  */
 212 #define CF_NOCACHE     0x10000 /* To be freed after execution */
 213 #define CF_USE_ICOUNT  0x20000
 214 #define CF_IGNORE_ICOUNT 0x40000 /* Do not generate icount code */
 215
 216     uint16_t invalid;
 217
 218     void *tc_ptr;    /* pointer to the translated code */
 219     uint8_t *tc_search;  /* pointer to search data */
 220     /* original tb when cflags has CF_NOCACHE */
 221     struct TranslationBlock *orig_tb;
 222     /* first and second physical page containing code. The lower bit
 223        of the pointer tells the index in page_next[] */
 224     struct TranslationBlock *page_next[2];
 225     tb_page_addr_t page_addr[2];
 226
 227     /* The following data are used to directly call another TB from
 228      * the code of this one. This can be done either by emitting direct or
 229      * indirect native jump instructions. These jumps are reset so that the TB
 230      * just continue its execution. The TB can be linked to another one by
 231      * setting one of the jump targets (or patching the jump instruction). Only
 232      * two of such jumps are supported.
 233      */
 234     uint16_t jmp_reset_offset[2]; /* offset of original jump target */
 235 #define TB_JMP_RESET_OFFSET_INVALID 0xffff /* indicates no jump generated */
 236 #ifdef USE_DIRECT_JUMP
 237     uint16_t jmp_insn_offset[2]; /* offset of native jump instruction */
 238 #else
 239     uintptr_t jmp_target_addr[2]; /* target address for indirect jump */
 240 #endif
 241     /* Each TB has an assosiated circular list of TBs jumping to this one.
 242      * jmp_list_first points to the first TB jumping to this one.
 243      * jmp_list_next is used to point to the next TB in a list.
 244      * Since each TB can have two jumps, it can participate in two lists.
 245      * jmp_list_first and jmp_list_next are 4-byte aligned pointers to a
 246      * TranslationBlock structure, but the two least significant bits of
 247      * them are used to encode which data field of the pointed TB should
 248      * be used to traverse the list further from that TB:
 249      * 0 => jmp_list_next[0], 1 => jmp_list_next[1], 2 => jmp_list_first.
 250      * In other words, 0/1 tells which jump is used in the pointed TB,
 251      * and 2 means that this is a pointer back to the target TB of this list.
 252      */
 253     uintptr_t jmp_list_next[2];
 254     uintptr_t jmp_list_first;
 255 };
 256
 257 void tb_free(TranslationBlock *tb);
 258 void tb_flush(CPUState *cpu);
 259 void tb_phys_invalidate(TranslationBlock *tb, tb_page_addr_t page_addr);
 260
 261 #if defined(USE_DIRECT_JUMP)
 262
 263 #if defined(CONFIG_TCG_INTERPRETER)
 264 static inline void tb_set_jmp_target1(uintptr_t jmp_addr, uintptr_t addr)
 265 {
 266     /* patch the branch destination */
 267     atomic_set((int32_t *)jmp_addr, addr - (jmp_addr + 4));
 268     /* no need to flush icache explicitly */
 269 }
 270 #elif defined(_ARCH_PPC)
 271 void ppc_tb_set_jmp_target(uintptr_t jmp_addr, uintptr_t addr);
 272 #define tb_set_jmp_target1 ppc_tb_set_jmp_target
 273 #elif defined(__i386__) || defined(__x86_64__)
 274 static inline void tb_set_jmp_target1(uintptr_t jmp_addr, uintptr_t addr)
 275 {
 276     /* patch the branch destination */
 277     atomic_set((int32_t *)jmp_addr, addr - (jmp_addr + 4));
 278     /* no need to flush icache explicitly */
 279 }
 280 #elif defined(__s390x__)
 281 static inline void tb_set_jmp_target1(uintptr_t jmp_addr, uintptr_t addr)
 282 {
 283     /* patch the branch destination */
 284     intptr_t disp = addr - (jmp_addr - 2);
 285     atomic_set((int32_t *)jmp_addr, disp / 2);
 286     /* no need to flush icache explicitly */
 287 }
 288 #elif defined(__aarch64__)
 289 void aarch64_tb_set_jmp_target(uintptr_t jmp_addr, uintptr_t addr);
 290 #define tb_set_jmp_target1 aarch64_tb_set_jmp_target
 291 #elif defined(__arm__)
 292 void arm_tb_set_jmp_target(uintptr_t jmp_addr, uintptr_t addr);
 293 #define tb_set_jmp_target1 arm_tb_set_jmp_target
 294 #elif defined(__sparc__) || defined(__mips__)
 295 void tb_set_jmp_target1(uintptr_t jmp_addr, uintptr_t addr);
 296 #else
 297 #error tb_set_jmp_target1 is missing
 298 #endif
 299
 300 static inline void tb_set_jmp_target(TranslationBlock *tb,
 301                                      int n, uintptr_t addr)
 302 {
 303     uint16_t offset = tb->jmp_insn_offset[n];
 304     tb_set_jmp_target1((uintptr_t)(tb->tc_ptr + offset), addr);
 305 }
 306
 307 #else
 308
 309 /* set the jump target */
 310 static inline void tb_set_jmp_target(TranslationBlock *tb,
 311                                      int n, uintptr_t addr)
 312 {
 313     tb->jmp_target_addr[n] = addr;
 314 }
 315
 316 #endif
 317
 318 static inline void tb_add_jump(TranslationBlock *tb, int n,
 319                                TranslationBlock *tb_next)
 320 {
 321     if (tb->jmp_list_next[n]) {
 322         /* Another thread has already done this while we were
 323          * outside of the lock; nothing to do in this case */
 324         return;
 325     }
 326     qemu_log_mask_and_addr(CPU_LOG_EXEC, tb->pc,
 327                            "Linking TBs %p [" TARGET_FMT_lx
 328                            "] index %d -> %p [" TARGET_FMT_lx "]\n",
 329                            tb->tc_ptr, tb->pc, n,
 330                            tb_next->tc_ptr, tb_next->pc);
 331
 332     /* patch the native jump address */
 333     tb_set_jmp_target(tb, n, (uintptr_t)tb_next->tc_ptr);
 334
 335     /* add in TB jmp circular list */
 336     tb->jmp_list_next[n] = tb_next->jmp_list_first;
 337     tb_next->jmp_list_first = (uintptr_t)tb | n;
 338 }
 339
 340 /* GETPC is the true target of the return instruction that we'll execute.  */
 341 #if defined(CONFIG_TCG_INTERPRETER)
 342 extern uintptr_t tci_tb_ptr;
 343 # define GETPC() tci_tb_ptr
 344 #else
 345 # define GETPC() \
 346     ((uintptr_t)__builtin_extract_return_addr(__builtin_return_address(0)))
 347 #endif
 348
 349 /* The true return address will often point to a host insn that is part of
 350    the next translated guest insn.  Adjust the address backward to point to
 351    the middle of the call insn.  Subtracting one would do the job except for
 352    several compressed mode architectures (arm, mips) which set the low bit
 353    to indicate the compressed mode; subtracting two works around that.  It
 354    is also the case that there are no host isas that contain a call insn
 355    smaller than 4 bytes, so we don't worry about special-casing this.  */
 356 #define GETPC_ADJ   2
 357
 358 #if !defined(CONFIG_USER_ONLY)
 359
 360 struct MemoryRegion *iotlb_to_region(CPUState *cpu,
 361                                      hwaddr index, MemTxAttrs attrs);
 362
 363 void tlb_fill(CPUState *cpu, target_ulong addr, MMUAccessType access_type,
 364               int mmu_idx, uintptr_t retaddr);
 365
 366 #endif
 367
 368 #if defined(CONFIG_USER_ONLY)
 369 void mmap_lock(void);
 370 void mmap_unlock(void);
 371
 372 static inline tb_page_addr_t get_page_addr_code(CPUArchState *env1, target_ulong addr)
 373 {
 374     return addr;
 375 }
 376 #else
 377 static inline void mmap_lock(void) {}
 378 static inline void mmap_unlock(void) {}
 379
 380 /* cputlb.c */
 381 tb_page_addr_t get_page_addr_code(CPUArchState *env1, target_ulong addr);
 382
 383 void tlb_reset_dirty(CPUState *cpu, ram_addr_t start1, ram_addr_t length);
 384 void tlb_set_dirty(CPUState *cpu, target_ulong vaddr);
 385
 386 /* exec.c */
 387 void tb_flush_jmp_cache(CPUState *cpu, target_ulong addr);
 388
 389 MemoryRegionSection *
 390 address_space_translate_for_iotlb(CPUState *cpu, int asidx, hwaddr addr,
 391                                   hwaddr *xlat, hwaddr *plen);
 392 hwaddr memory_region_section_get_iotlb(CPUState *cpu,
 393                                        MemoryRegionSection *section,
 394                                        target_ulong vaddr,
 395                                        hwaddr paddr, hwaddr xlat,
 396                                        int prot,
 397                                        target_ulong *address);
 398 bool memory_region_is_unassigned(MemoryRegion *mr);
 399
 400 #endif
 401
 402 /* vl.c */
 403 extern int singlestep;
 404
 405 /* cpu-exec.c, accessed with atomic_mb_read/atomic_mb_set */
 406 extern CPUState *tcg_current_cpu;
 407 extern bool exit_request;
 408
 409 #endif