1 #ifndef QEMU_H 2 #define QEMU_H 3 4 #include "hostdep.h" 5 #include "cpu.h" 6 #include "exec/exec-all.h" 7 #include "exec/cpu_ldst.h" 8 9 #undef DEBUG_REMAP 10 11 #include "exec/user/abitypes.h" 12 13 #include "exec/user/thunk.h" 14 #include "syscall_defs.h" 15 #include "target_syscall.h" 16 #include "exec/gdbstub.h" 17 18 /* 19 * This is the size of the host kernel's sigset_t, needed where we make 20 * direct system calls that take a sigset_t pointer and a size. 21 */ 22 #define SIGSET_T_SIZE (_NSIG / 8) 23 24 /* 25 * This struct is used to hold certain information about the image. 26 * Basically, it replicates in user space what would be certain 27 * task_struct fields in the kernel 28 */ 29 struct image_info { 30 abi_ulong load_bias; 31 abi_ulong load_addr; 32 abi_ulong start_code; 33 abi_ulong end_code; 34 abi_ulong start_data; 35 abi_ulong end_data; 36 abi_ulong start_brk; 37 abi_ulong brk; 38 abi_ulong reserve_brk; 39 abi_ulong start_mmap; 40 abi_ulong start_stack; 41 abi_ulong stack_limit; 42 abi_ulong entry; 43 abi_ulong code_offset; 44 abi_ulong data_offset; 45 abi_ulong saved_auxv; 46 abi_ulong auxv_len; 47 abi_ulong arg_start; 48 abi_ulong arg_end; 49 abi_ulong arg_strings; 50 abi_ulong env_strings; 51 abi_ulong file_string; 52 uint32_t elf_flags; 53 int personality; 54 abi_ulong alignment; 55 56 /* The fields below are used in FDPIC mode. */ 57 abi_ulong loadmap_addr; 58 uint16_t nsegs; 59 void *loadsegs; 60 abi_ulong pt_dynamic_addr; 61 abi_ulong interpreter_loadmap_addr; 62 abi_ulong interpreter_pt_dynamic_addr; 63 struct image_info *other_info; 64 65 /* For target-specific processing of NT_GNU_PROPERTY_TYPE_0. */ 66 uint32_t note_flags; 67 68 #ifdef TARGET_MIPS 69 int fp_abi; 70 int interp_fp_abi; 71 #endif 72 }; 73 74 #ifdef TARGET_I386 75 /* Information about the current linux thread */ 76 struct vm86_saved_state { 77 uint32_t eax; /* return code */ 78 uint32_t ebx; 79 uint32_t ecx; 80 uint32_t edx; 81 uint32_t esi; 82 uint32_t edi; 83 uint32_t ebp; 84 uint32_t esp; 85 uint32_t eflags; 86 uint32_t eip; 87 uint16_t cs, ss, ds, es, fs, gs; 88 }; 89 #endif 90 91 #if defined(TARGET_ARM) && defined(TARGET_ABI32) 92 /* FPU emulator */ 93 #include "nwfpe/fpa11.h" 94 #endif 95 96 #define MAX_SIGQUEUE_SIZE 1024 97 98 struct emulated_sigtable { 99 int pending; /* true if signal is pending */ 100 target_siginfo_t info; 101 }; 102 103 /* 104 * NOTE: we force a big alignment so that the stack stored after is 105 * aligned too 106 */ 107 typedef struct TaskState { 108 pid_t ts_tid; /* tid (or pid) of this task */ 109 #ifdef TARGET_ARM 110 # ifdef TARGET_ABI32 111 /* FPA state */ 112 FPA11 fpa; 113 # endif 114 #endif 115 #if defined(TARGET_ARM) || defined(TARGET_RISCV) 116 int swi_errno; 117 #endif 118 #if defined(TARGET_I386) && !defined(TARGET_X86_64) 119 abi_ulong target_v86; 120 struct vm86_saved_state vm86_saved_regs; 121 struct target_vm86plus_struct vm86plus; 122 uint32_t v86flags; 123 uint32_t v86mask; 124 #endif 125 abi_ulong child_tidptr; 126 #ifdef TARGET_M68K 127 abi_ulong tp_value; 128 #endif 129 #if defined(TARGET_ARM) || defined(TARGET_M68K) || defined(TARGET_RISCV) 130 /* Extra fields for semihosted binaries. */ 131 abi_ulong heap_base; 132 abi_ulong heap_limit; 133 #endif 134 abi_ulong stack_base; 135 int used; /* non zero if used */ 136 struct image_info *info; 137 struct linux_binprm *bprm; 138 139 struct emulated_sigtable sync_signal; 140 struct emulated_sigtable sigtab[TARGET_NSIG]; 141 /* 142 * This thread's signal mask, as requested by the guest program. 143 * The actual signal mask of this thread may differ: 144 * + we don't let SIGSEGV and SIGBUS be blocked while running guest code 145 * + sometimes we block all signals to avoid races 146 */ 147 sigset_t signal_mask; 148 /* 149 * The signal mask imposed by a guest sigsuspend syscall, if we are 150 * currently in the middle of such a syscall 151 */ 152 sigset_t sigsuspend_mask; 153 /* Nonzero if we're leaving a sigsuspend and sigsuspend_mask is valid. */ 154 int in_sigsuspend; 155 156 /* 157 * Nonzero if process_pending_signals() needs to do something (either 158 * handle a pending signal or unblock signals). 159 * This flag is written from a signal handler so should be accessed via 160 * the qatomic_read() and qatomic_set() functions. (It is not accessed 161 * from multiple threads.) 162 */ 163 int signal_pending; 164 165 /* This thread's sigaltstack, if it has one */ 166 struct target_sigaltstack sigaltstack_used; 167 } __attribute__((aligned(16))) TaskState; 168 169 extern char *exec_path; 170 void init_task_state(TaskState *ts); 171 void task_settid(TaskState *); 172 void stop_all_tasks(void); 173 extern const char *qemu_uname_release; 174 extern unsigned long mmap_min_addr; 175 176 /* ??? See if we can avoid exposing so much of the loader internals. */ 177 178 /* 179 * Read a good amount of data initially, to hopefully get all the 180 * program headers loaded. 181 */ 182 #define BPRM_BUF_SIZE 1024 183 184 /* 185 * This structure is used to hold the arguments that are 186 * used when loading binaries. 187 */ 188 struct linux_binprm { 189 char buf[BPRM_BUF_SIZE] __attribute__((aligned)); 190 abi_ulong p; 191 int fd; 192 int e_uid, e_gid; 193 int argc, envc; 194 char **argv; 195 char **envp; 196 char *filename; /* Name of binary */ 197 int (*core_dump)(int, const CPUArchState *); /* coredump routine */ 198 }; 199 200 typedef struct IOCTLEntry IOCTLEntry; 201 202 typedef abi_long do_ioctl_fn(const IOCTLEntry *ie, uint8_t *buf_temp, 203 int fd, int cmd, abi_long arg); 204 205 struct IOCTLEntry { 206 int target_cmd; 207 unsigned int host_cmd; 208 const char *name; 209 int access; 210 do_ioctl_fn *do_ioctl; 211 const argtype arg_type[5]; 212 }; 213 214 extern IOCTLEntry ioctl_entries[]; 215 216 #define IOC_R 0x0001 217 #define IOC_W 0x0002 218 #define IOC_RW (IOC_R | IOC_W) 219 220 void do_init_thread(struct target_pt_regs *regs, struct image_info *infop); 221 abi_ulong loader_build_argptr(int envc, int argc, abi_ulong sp, 222 abi_ulong stringp, int push_ptr); 223 int loader_exec(int fdexec, const char *filename, char **argv, char **envp, 224 struct target_pt_regs *regs, struct image_info *infop, 225 struct linux_binprm *); 226 227 /* 228 * Returns true if the image uses the FDPIC ABI. If this is the case, 229 * we have to provide some information (loadmap, pt_dynamic_info) such 230 * that the program can be relocated adequately. This is also useful 231 * when handling signals. 232 */ 233 int info_is_fdpic(struct image_info *info); 234 235 uint32_t get_elf_eflags(int fd); 236 int load_elf_binary(struct linux_binprm *bprm, struct image_info *info); 237 int load_flt_binary(struct linux_binprm *bprm, struct image_info *info); 238 239 abi_long memcpy_to_target(abi_ulong dest, const void *src, 240 unsigned long len); 241 void target_set_brk(abi_ulong new_brk); 242 abi_long do_brk(abi_ulong new_brk); 243 void syscall_init(void); 244 abi_long do_syscall(void *cpu_env, int num, abi_long arg1, 245 abi_long arg2, abi_long arg3, abi_long arg4, 246 abi_long arg5, abi_long arg6, abi_long arg7, 247 abi_long arg8); 248 extern __thread CPUState *thread_cpu; 249 void cpu_loop(CPUArchState *env); 250 const char *target_strerror(int err); 251 int get_osversion(void); 252 void init_qemu_uname_release(void); 253 void fork_start(void); 254 void fork_end(int child); 255 256 /** 257 * probe_guest_base: 258 * @image_name: the executable being loaded 259 * @loaddr: the lowest fixed address in the executable 260 * @hiaddr: the highest fixed address in the executable 261 * 262 * Creates the initial guest address space in the host memory space. 263 * 264 * If @loaddr == 0, then no address in the executable is fixed, 265 * i.e. it is fully relocatable. In that case @hiaddr is the size 266 * of the executable. 267 * 268 * This function will not return if a valid value for guest_base 269 * cannot be chosen. On return, the executable loader can expect 270 * 271 * target_mmap(loaddr, hiaddr - loaddr, ...) 272 * 273 * to succeed. 274 */ 275 void probe_guest_base(const char *image_name, 276 abi_ulong loaddr, abi_ulong hiaddr); 277 278 #include "qemu/log.h" 279 280 /* safe_syscall.S */ 281 282 /** 283 * safe_syscall: 284 * @int number: number of system call to make 285 * ...: arguments to the system call 286 * 287 * Call a system call if guest signal not pending. 288 * This has the same API as the libc syscall() function, except that it 289 * may return -1 with errno == TARGET_ERESTARTSYS if a signal was pending. 290 * 291 * Returns: the system call result, or -1 with an error code in errno 292 * (Errnos are host errnos; we rely on TARGET_ERESTARTSYS not clashing 293 * with any of the host errno values.) 294 */ 295 296 /* 297 * A guide to using safe_syscall() to handle interactions between guest 298 * syscalls and guest signals: 299 * 300 * Guest syscalls come in two flavours: 301 * 302 * (1) Non-interruptible syscalls 303 * 304 * These are guest syscalls that never get interrupted by signals and 305 * so never return EINTR. They can be implemented straightforwardly in 306 * QEMU: just make sure that if the implementation code has to make any 307 * blocking calls that those calls are retried if they return EINTR. 308 * It's also OK to implement these with safe_syscall, though it will be 309 * a little less efficient if a signal is delivered at the 'wrong' moment. 310 * 311 * Some non-interruptible syscalls need to be handled using block_signals() 312 * to block signals for the duration of the syscall. This mainly applies 313 * to code which needs to modify the data structures used by the 314 * host_signal_handler() function and the functions it calls, including 315 * all syscalls which change the thread's signal mask. 316 * 317 * (2) Interruptible syscalls 318 * 319 * These are guest syscalls that can be interrupted by signals and 320 * for which we need to either return EINTR or arrange for the guest 321 * syscall to be restarted. This category includes both syscalls which 322 * always restart (and in the kernel return -ERESTARTNOINTR), ones 323 * which only restart if there is no handler (kernel returns -ERESTARTNOHAND 324 * or -ERESTART_RESTARTBLOCK), and the most common kind which restart 325 * if the handler was registered with SA_RESTART (kernel returns 326 * -ERESTARTSYS). System calls which are only interruptible in some 327 * situations (like 'open') also need to be handled this way. 328 * 329 * Here it is important that the host syscall is made 330 * via this safe_syscall() function, and *not* via the host libc. 331 * If the host libc is used then the implementation will appear to work 332 * most of the time, but there will be a race condition where a 333 * signal could arrive just before we make the host syscall inside libc, 334 * and then then guest syscall will not correctly be interrupted. 335 * Instead the implementation of the guest syscall can use the safe_syscall 336 * function but otherwise just return the result or errno in the usual 337 * way; the main loop code will take care of restarting the syscall 338 * if appropriate. 339 * 340 * (If the implementation needs to make multiple host syscalls this is 341 * OK; any which might really block must be via safe_syscall(); for those 342 * which are only technically blocking (ie which we know in practice won't 343 * stay in the host kernel indefinitely) it's OK to use libc if necessary. 344 * You must be able to cope with backing out correctly if some safe_syscall 345 * you make in the implementation returns either -TARGET_ERESTARTSYS or 346 * EINTR though.) 347 * 348 * block_signals() cannot be used for interruptible syscalls. 349 * 350 * 351 * How and why the safe_syscall implementation works: 352 * 353 * The basic setup is that we make the host syscall via a known 354 * section of host native assembly. If a signal occurs, our signal 355 * handler checks the interrupted host PC against the addresse of that 356 * known section. If the PC is before or at the address of the syscall 357 * instruction then we change the PC to point at a "return 358 * -TARGET_ERESTARTSYS" code path instead, and then exit the signal handler 359 * (causing the safe_syscall() call to immediately return that value). 360 * Then in the main.c loop if we see this magic return value we adjust 361 * the guest PC to wind it back to before the system call, and invoke 362 * the guest signal handler as usual. 363 * 364 * This winding-back will happen in two cases: 365 * (1) signal came in just before we took the host syscall (a race); 366 * in this case we'll take the guest signal and have another go 367 * at the syscall afterwards, and this is indistinguishable for the 368 * guest from the timing having been different such that the guest 369 * signal really did win the race 370 * (2) signal came in while the host syscall was blocking, and the 371 * host kernel decided the syscall should be restarted; 372 * in this case we want to restart the guest syscall also, and so 373 * rewinding is the right thing. (Note that "restart" semantics mean 374 * "first call the signal handler, then reattempt the syscall".) 375 * The other situation to consider is when a signal came in while the 376 * host syscall was blocking, and the host kernel decided that the syscall 377 * should not be restarted; in this case QEMU's host signal handler will 378 * be invoked with the PC pointing just after the syscall instruction, 379 * with registers indicating an EINTR return; the special code in the 380 * handler will not kick in, and we will return EINTR to the guest as 381 * we should. 382 * 383 * Notice that we can leave the host kernel to make the decision for 384 * us about whether to do a restart of the syscall or not; we do not 385 * need to check SA_RESTART flags in QEMU or distinguish the various 386 * kinds of restartability. 387 */ 388 #ifdef HAVE_SAFE_SYSCALL 389 /* The core part of this function is implemented in assembly */ 390 extern long safe_syscall_base(int *pending, long number, ...); 391 392 #define safe_syscall(...) \ 393 ({ \ 394 long ret_; \ 395 int *psp_ = &((TaskState *)thread_cpu->opaque)->signal_pending; \ 396 ret_ = safe_syscall_base(psp_, __VA_ARGS__); \ 397 if (is_error(ret_)) { \ 398 errno = -ret_; \ 399 ret_ = -1; \ 400 } \ 401 ret_; \ 402 }) 403 404 #else 405 406 /* 407 * Fallback for architectures which don't yet provide a safe-syscall assembly 408 * fragment; note that this is racy! 409 * This should go away when all host architectures have been updated. 410 */ 411 #define safe_syscall syscall 412 413 #endif 414 415 /* syscall.c */ 416 int host_to_target_waitstatus(int status); 417 418 #ifdef TARGET_I386 419 /* vm86.c */ 420 void save_v86_state(CPUX86State *env); 421 void handle_vm86_trap(CPUX86State *env, int trapno); 422 void handle_vm86_fault(CPUX86State *env); 423 int do_vm86(CPUX86State *env, long subfunction, abi_ulong v86_addr); 424 #elif defined(TARGET_SPARC64) 425 void sparc64_set_context(CPUSPARCState *env); 426 void sparc64_get_context(CPUSPARCState *env); 427 #endif 428 429 /* mmap.c */ 430 int target_mprotect(abi_ulong start, abi_ulong len, int prot); 431 abi_long target_mmap(abi_ulong start, abi_ulong len, int prot, 432 int flags, int fd, abi_ulong offset); 433 int target_munmap(abi_ulong start, abi_ulong len); 434 abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size, 435 abi_ulong new_size, unsigned long flags, 436 abi_ulong new_addr); 437 extern unsigned long last_brk; 438 extern abi_ulong mmap_next_start; 439 abi_ulong mmap_find_vma(abi_ulong, abi_ulong, abi_ulong); 440 void mmap_fork_start(void); 441 void mmap_fork_end(int child); 442 443 /* main.c */ 444 extern unsigned long guest_stack_size; 445 446 /* user access */ 447 448 #define VERIFY_READ PAGE_READ 449 #define VERIFY_WRITE (PAGE_READ | PAGE_WRITE) 450 451 static inline bool access_ok_untagged(int type, abi_ulong addr, abi_ulong size) 452 { 453 if (size == 0 454 ? !guest_addr_valid_untagged(addr) 455 : !guest_range_valid_untagged(addr, size)) { 456 return false; 457 } 458 return page_check_range((target_ulong)addr, size, type) == 0; 459 } 460 461 static inline bool access_ok(CPUState *cpu, int type, 462 abi_ulong addr, abi_ulong size) 463 { 464 return access_ok_untagged(type, cpu_untagged_addr(cpu, addr), size); 465 } 466 467 /* NOTE __get_user and __put_user use host pointers and don't check access. 468 These are usually used to access struct data members once the struct has 469 been locked - usually with lock_user_struct. */ 470 471 /* 472 * Tricky points: 473 * - Use __builtin_choose_expr to avoid type promotion from ?:, 474 * - Invalid sizes result in a compile time error stemming from 475 * the fact that abort has no parameters. 476 * - It's easier to use the endian-specific unaligned load/store 477 * functions than host-endian unaligned load/store plus tswapN. 478 * - The pragmas are necessary only to silence a clang false-positive 479 * warning: see https://bugs.llvm.org/show_bug.cgi?id=39113 . 480 * - gcc has bugs in its _Pragma() support in some versions, eg 481 * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83256 -- so we only 482 * include the warning-suppression pragmas for clang 483 */ 484 #if defined(__clang__) && __has_warning("-Waddress-of-packed-member") 485 #define PRAGMA_DISABLE_PACKED_WARNING \ 486 _Pragma("GCC diagnostic push"); \ 487 _Pragma("GCC diagnostic ignored \"-Waddress-of-packed-member\"") 488 489 #define PRAGMA_REENABLE_PACKED_WARNING \ 490 _Pragma("GCC diagnostic pop") 491 492 #else 493 #define PRAGMA_DISABLE_PACKED_WARNING 494 #define PRAGMA_REENABLE_PACKED_WARNING 495 #endif 496 497 #define __put_user_e(x, hptr, e) \ 498 do { \ 499 PRAGMA_DISABLE_PACKED_WARNING; \ 500 (__builtin_choose_expr(sizeof(*(hptr)) == 1, stb_p, \ 501 __builtin_choose_expr(sizeof(*(hptr)) == 2, stw_##e##_p, \ 502 __builtin_choose_expr(sizeof(*(hptr)) == 4, stl_##e##_p, \ 503 __builtin_choose_expr(sizeof(*(hptr)) == 8, stq_##e##_p, abort)))) \ 504 ((hptr), (x)), (void)0); \ 505 PRAGMA_REENABLE_PACKED_WARNING; \ 506 } while (0) 507 508 #define __get_user_e(x, hptr, e) \ 509 do { \ 510 PRAGMA_DISABLE_PACKED_WARNING; \ 511 ((x) = (typeof(*hptr))( \ 512 __builtin_choose_expr(sizeof(*(hptr)) == 1, ldub_p, \ 513 __builtin_choose_expr(sizeof(*(hptr)) == 2, lduw_##e##_p, \ 514 __builtin_choose_expr(sizeof(*(hptr)) == 4, ldl_##e##_p, \ 515 __builtin_choose_expr(sizeof(*(hptr)) == 8, ldq_##e##_p, abort)))) \ 516 (hptr)), (void)0); \ 517 PRAGMA_REENABLE_PACKED_WARNING; \ 518 } while (0) 519 520 521 #ifdef TARGET_WORDS_BIGENDIAN 522 # define __put_user(x, hptr) __put_user_e(x, hptr, be) 523 # define __get_user(x, hptr) __get_user_e(x, hptr, be) 524 #else 525 # define __put_user(x, hptr) __put_user_e(x, hptr, le) 526 # define __get_user(x, hptr) __get_user_e(x, hptr, le) 527 #endif 528 529 /* put_user()/get_user() take a guest address and check access */ 530 /* These are usually used to access an atomic data type, such as an int, 531 * that has been passed by address. These internally perform locking 532 * and unlocking on the data type. 533 */ 534 #define put_user(x, gaddr, target_type) \ 535 ({ \ 536 abi_ulong __gaddr = (gaddr); \ 537 target_type *__hptr; \ 538 abi_long __ret = 0; \ 539 if ((__hptr = lock_user(VERIFY_WRITE, __gaddr, sizeof(target_type), 0))) { \ 540 __put_user((x), __hptr); \ 541 unlock_user(__hptr, __gaddr, sizeof(target_type)); \ 542 } else \ 543 __ret = -TARGET_EFAULT; \ 544 __ret; \ 545 }) 546 547 #define get_user(x, gaddr, target_type) \ 548 ({ \ 549 abi_ulong __gaddr = (gaddr); \ 550 target_type *__hptr; \ 551 abi_long __ret = 0; \ 552 if ((__hptr = lock_user(VERIFY_READ, __gaddr, sizeof(target_type), 1))) { \ 553 __get_user((x), __hptr); \ 554 unlock_user(__hptr, __gaddr, 0); \ 555 } else { \ 556 /* avoid warning */ \ 557 (x) = 0; \ 558 __ret = -TARGET_EFAULT; \ 559 } \ 560 __ret; \ 561 }) 562 563 #define put_user_ual(x, gaddr) put_user((x), (gaddr), abi_ulong) 564 #define put_user_sal(x, gaddr) put_user((x), (gaddr), abi_long) 565 #define put_user_u64(x, gaddr) put_user((x), (gaddr), uint64_t) 566 #define put_user_s64(x, gaddr) put_user((x), (gaddr), int64_t) 567 #define put_user_u32(x, gaddr) put_user((x), (gaddr), uint32_t) 568 #define put_user_s32(x, gaddr) put_user((x), (gaddr), int32_t) 569 #define put_user_u16(x, gaddr) put_user((x), (gaddr), uint16_t) 570 #define put_user_s16(x, gaddr) put_user((x), (gaddr), int16_t) 571 #define put_user_u8(x, gaddr) put_user((x), (gaddr), uint8_t) 572 #define put_user_s8(x, gaddr) put_user((x), (gaddr), int8_t) 573 574 #define get_user_ual(x, gaddr) get_user((x), (gaddr), abi_ulong) 575 #define get_user_sal(x, gaddr) get_user((x), (gaddr), abi_long) 576 #define get_user_u64(x, gaddr) get_user((x), (gaddr), uint64_t) 577 #define get_user_s64(x, gaddr) get_user((x), (gaddr), int64_t) 578 #define get_user_u32(x, gaddr) get_user((x), (gaddr), uint32_t) 579 #define get_user_s32(x, gaddr) get_user((x), (gaddr), int32_t) 580 #define get_user_u16(x, gaddr) get_user((x), (gaddr), uint16_t) 581 #define get_user_s16(x, gaddr) get_user((x), (gaddr), int16_t) 582 #define get_user_u8(x, gaddr) get_user((x), (gaddr), uint8_t) 583 #define get_user_s8(x, gaddr) get_user((x), (gaddr), int8_t) 584 585 /* copy_from_user() and copy_to_user() are usually used to copy data 586 * buffers between the target and host. These internally perform 587 * locking/unlocking of the memory. 588 */ 589 int copy_from_user(void *hptr, abi_ulong gaddr, ssize_t len); 590 int copy_to_user(abi_ulong gaddr, void *hptr, ssize_t len); 591 592 /* Functions for accessing guest memory. The tget and tput functions 593 read/write single values, byteswapping as necessary. The lock_user function 594 gets a pointer to a contiguous area of guest memory, but does not perform 595 any byteswapping. lock_user may return either a pointer to the guest 596 memory, or a temporary buffer. */ 597 598 /* Lock an area of guest memory into the host. If copy is true then the 599 host area will have the same contents as the guest. */ 600 void *lock_user(int type, abi_ulong guest_addr, ssize_t len, bool copy); 601 602 /* Unlock an area of guest memory. The first LEN bytes must be 603 flushed back to guest memory. host_ptr = NULL is explicitly 604 allowed and does nothing. */ 605 #ifndef DEBUG_REMAP 606 static inline void unlock_user(void *host_ptr, abi_ulong guest_addr, 607 ssize_t len) 608 { 609 /* no-op */ 610 } 611 #else 612 void unlock_user(void *host_ptr, abi_ulong guest_addr, ssize_t len); 613 #endif 614 615 /* Return the length of a string in target memory or -TARGET_EFAULT if 616 access error. */ 617 ssize_t target_strlen(abi_ulong gaddr); 618 619 /* Like lock_user but for null terminated strings. */ 620 void *lock_user_string(abi_ulong guest_addr); 621 622 /* Helper macros for locking/unlocking a target struct. */ 623 #define lock_user_struct(type, host_ptr, guest_addr, copy) \ 624 (host_ptr = lock_user(type, guest_addr, sizeof(*host_ptr), copy)) 625 #define unlock_user_struct(host_ptr, guest_addr, copy) \ 626 unlock_user(host_ptr, guest_addr, (copy) ? sizeof(*host_ptr) : 0) 627 628 #include <pthread.h> 629 630 static inline int is_error(abi_long ret) 631 { 632 return (abi_ulong)ret >= (abi_ulong)(-4096); 633 } 634 635 #if TARGET_ABI_BITS == 32 636 static inline uint64_t target_offset64(uint32_t word0, uint32_t word1) 637 { 638 #ifdef TARGET_WORDS_BIGENDIAN 639 return ((uint64_t)word0 << 32) | word1; 640 #else 641 return ((uint64_t)word1 << 32) | word0; 642 #endif 643 } 644 #else /* TARGET_ABI_BITS == 32 */ 645 static inline uint64_t target_offset64(uint64_t word0, uint64_t word1) 646 { 647 return word0; 648 } 649 #endif /* TARGET_ABI_BITS != 32 */ 650 651 void print_termios(void *arg); 652 653 /* ARM EABI and MIPS expect 64bit types aligned even on pairs or registers */ 654 #ifdef TARGET_ARM 655 static inline int regpairs_aligned(void *cpu_env, int num) 656 { 657 return ((((CPUARMState *)cpu_env)->eabi) == 1) ; 658 } 659 #elif defined(TARGET_MIPS) && (TARGET_ABI_BITS == 32) 660 static inline int regpairs_aligned(void *cpu_env, int num) { return 1; } 661 #elif defined(TARGET_PPC) && !defined(TARGET_PPC64) 662 /* 663 * SysV AVI for PPC32 expects 64bit parameters to be passed on odd/even pairs 664 * of registers which translates to the same as ARM/MIPS, because we start with 665 * r3 as arg1 666 */ 667 static inline int regpairs_aligned(void *cpu_env, int num) { return 1; } 668 #elif defined(TARGET_SH4) 669 /* SH4 doesn't align register pairs, except for p{read,write}64 */ 670 static inline int regpairs_aligned(void *cpu_env, int num) 671 { 672 switch (num) { 673 case TARGET_NR_pread64: 674 case TARGET_NR_pwrite64: 675 return 1; 676 677 default: 678 return 0; 679 } 680 } 681 #elif defined(TARGET_XTENSA) 682 static inline int regpairs_aligned(void *cpu_env, int num) { return 1; } 683 #elif defined(TARGET_HEXAGON) 684 static inline int regpairs_aligned(void *cpu_env, int num) { return 1; } 685 #else 686 static inline int regpairs_aligned(void *cpu_env, int num) { return 0; } 687 #endif 688 689 /** 690 * preexit_cleanup: housekeeping before the guest exits 691 * 692 * env: the CPU state 693 * code: the exit code 694 */ 695 void preexit_cleanup(CPUArchState *env, int code); 696 697 /* 698 * Include target-specific struct and function definitions; 699 * they may need access to the target-independent structures 700 * above, so include them last. 701 */ 702 #include "target_cpu.h" 703 #include "target_structs.h" 704 705 #endif /* QEMU_H */ 706