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 #ifdef DEBUG_REMAP 11 #endif /* DEBUG_REMAP */ 12 13 #include "exec/user/abitypes.h" 14 15 #include "exec/user/thunk.h" 16 #include "syscall_defs.h" 17 #include "target_syscall.h" 18 #include "exec/gdbstub.h" 19 20 /* This is the size of the host kernel's sigset_t, needed where we make 21 * direct system calls that take a sigset_t pointer and a size. 22 */ 23 #define SIGSET_T_SIZE (_NSIG / 8) 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 #ifdef TARGET_MIPS 65 int fp_abi; 66 int interp_fp_abi; 67 #endif 68 }; 69 70 #ifdef TARGET_I386 71 /* Information about the current linux thread */ 72 struct vm86_saved_state { 73 uint32_t eax; /* return code */ 74 uint32_t ebx; 75 uint32_t ecx; 76 uint32_t edx; 77 uint32_t esi; 78 uint32_t edi; 79 uint32_t ebp; 80 uint32_t esp; 81 uint32_t eflags; 82 uint32_t eip; 83 uint16_t cs, ss, ds, es, fs, gs; 84 }; 85 #endif 86 87 #if defined(TARGET_ARM) && defined(TARGET_ABI32) 88 /* FPU emulator */ 89 #include "nwfpe/fpa11.h" 90 #endif 91 92 #define MAX_SIGQUEUE_SIZE 1024 93 94 struct emulated_sigtable { 95 int pending; /* true if signal is pending */ 96 target_siginfo_t info; 97 }; 98 99 /* NOTE: we force a big alignment so that the stack stored after is 100 aligned too */ 101 typedef struct TaskState { 102 pid_t ts_tid; /* tid (or pid) of this task */ 103 #ifdef TARGET_ARM 104 # ifdef TARGET_ABI32 105 /* FPA state */ 106 FPA11 fpa; 107 # endif 108 int swi_errno; 109 #endif 110 #if defined(TARGET_I386) && !defined(TARGET_X86_64) 111 abi_ulong target_v86; 112 struct vm86_saved_state vm86_saved_regs; 113 struct target_vm86plus_struct vm86plus; 114 uint32_t v86flags; 115 uint32_t v86mask; 116 #endif 117 abi_ulong child_tidptr; 118 #ifdef TARGET_M68K 119 abi_ulong tp_value; 120 #endif 121 #if defined(TARGET_ARM) || defined(TARGET_M68K) 122 /* Extra fields for semihosted binaries. */ 123 abi_ulong heap_base; 124 abi_ulong heap_limit; 125 #endif 126 abi_ulong stack_base; 127 int used; /* non zero if used */ 128 struct image_info *info; 129 struct linux_binprm *bprm; 130 131 struct emulated_sigtable sync_signal; 132 struct emulated_sigtable sigtab[TARGET_NSIG]; 133 /* This thread's signal mask, as requested by the guest program. 134 * The actual signal mask of this thread may differ: 135 * + we don't let SIGSEGV and SIGBUS be blocked while running guest code 136 * + sometimes we block all signals to avoid races 137 */ 138 sigset_t signal_mask; 139 /* The signal mask imposed by a guest sigsuspend syscall, if we are 140 * currently in the middle of such a syscall 141 */ 142 sigset_t sigsuspend_mask; 143 /* Nonzero if we're leaving a sigsuspend and sigsuspend_mask is valid. */ 144 int in_sigsuspend; 145 146 /* Nonzero if process_pending_signals() needs to do something (either 147 * handle a pending signal or unblock signals). 148 * This flag is written from a signal handler so should be accessed via 149 * the atomic_read() and atomic_set() functions. (It is not accessed 150 * from multiple threads.) 151 */ 152 int signal_pending; 153 154 /* This thread's sigaltstack, if it has one */ 155 struct target_sigaltstack sigaltstack_used; 156 } __attribute__((aligned(16))) TaskState; 157 158 extern char *exec_path; 159 void init_task_state(TaskState *ts); 160 void task_settid(TaskState *); 161 void stop_all_tasks(void); 162 extern const char *qemu_uname_release; 163 extern unsigned long mmap_min_addr; 164 165 /* ??? See if we can avoid exposing so much of the loader internals. */ 166 167 /* Read a good amount of data initially, to hopefully get all the 168 program headers loaded. */ 169 #define BPRM_BUF_SIZE 1024 170 171 /* 172 * This structure is used to hold the arguments that are 173 * used when loading binaries. 174 */ 175 struct linux_binprm { 176 char buf[BPRM_BUF_SIZE] __attribute__((aligned)); 177 abi_ulong p; 178 int fd; 179 int e_uid, e_gid; 180 int argc, envc; 181 char **argv; 182 char **envp; 183 char * filename; /* Name of binary */ 184 int (*core_dump)(int, const CPUArchState *); /* coredump routine */ 185 }; 186 187 void do_init_thread(struct target_pt_regs *regs, struct image_info *infop); 188 abi_ulong loader_build_argptr(int envc, int argc, abi_ulong sp, 189 abi_ulong stringp, int push_ptr); 190 int loader_exec(int fdexec, const char *filename, char **argv, char **envp, 191 struct target_pt_regs * regs, struct image_info *infop, 192 struct linux_binprm *); 193 194 /* Returns true if the image uses the FDPIC ABI. If this is the case, 195 * we have to provide some information (loadmap, pt_dynamic_info) such 196 * that the program can be relocated adequately. This is also useful 197 * when handling signals. 198 */ 199 int info_is_fdpic(struct image_info *info); 200 201 uint32_t get_elf_eflags(int fd); 202 int load_elf_binary(struct linux_binprm *bprm, struct image_info *info); 203 int load_flt_binary(struct linux_binprm *bprm, struct image_info *info); 204 205 abi_long memcpy_to_target(abi_ulong dest, const void *src, 206 unsigned long len); 207 void target_set_brk(abi_ulong new_brk); 208 abi_long do_brk(abi_ulong new_brk); 209 void syscall_init(void); 210 abi_long do_syscall(void *cpu_env, int num, abi_long arg1, 211 abi_long arg2, abi_long arg3, abi_long arg4, 212 abi_long arg5, abi_long arg6, abi_long arg7, 213 abi_long arg8); 214 extern __thread CPUState *thread_cpu; 215 void cpu_loop(CPUArchState *env); 216 const char *target_strerror(int err); 217 int get_osversion(void); 218 void init_qemu_uname_release(void); 219 void fork_start(void); 220 void fork_end(int child); 221 222 /** 223 * probe_guest_base: 224 * @image_name: the executable being loaded 225 * @loaddr: the lowest fixed address in the executable 226 * @hiaddr: the highest fixed address in the executable 227 * 228 * Creates the initial guest address space in the host memory space. 229 * 230 * If @loaddr == 0, then no address in the executable is fixed, 231 * i.e. it is fully relocatable. In that case @hiaddr is the size 232 * of the executable. 233 * 234 * This function will not return if a valid value for guest_base 235 * cannot be chosen. On return, the executable loader can expect 236 * 237 * target_mmap(loaddr, hiaddr - loaddr, ...) 238 * 239 * to succeed. 240 */ 241 void probe_guest_base(const char *image_name, 242 abi_ulong loaddr, abi_ulong hiaddr); 243 244 #include "qemu/log.h" 245 246 /* safe_syscall.S */ 247 248 /** 249 * safe_syscall: 250 * @int number: number of system call to make 251 * ...: arguments to the system call 252 * 253 * Call a system call if guest signal not pending. 254 * This has the same API as the libc syscall() function, except that it 255 * may return -1 with errno == TARGET_ERESTARTSYS if a signal was pending. 256 * 257 * Returns: the system call result, or -1 with an error code in errno 258 * (Errnos are host errnos; we rely on TARGET_ERESTARTSYS not clashing 259 * with any of the host errno values.) 260 */ 261 262 /* A guide to using safe_syscall() to handle interactions between guest 263 * syscalls and guest signals: 264 * 265 * Guest syscalls come in two flavours: 266 * 267 * (1) Non-interruptible syscalls 268 * 269 * These are guest syscalls that never get interrupted by signals and 270 * so never return EINTR. They can be implemented straightforwardly in 271 * QEMU: just make sure that if the implementation code has to make any 272 * blocking calls that those calls are retried if they return EINTR. 273 * It's also OK to implement these with safe_syscall, though it will be 274 * a little less efficient if a signal is delivered at the 'wrong' moment. 275 * 276 * Some non-interruptible syscalls need to be handled using block_signals() 277 * to block signals for the duration of the syscall. This mainly applies 278 * to code which needs to modify the data structures used by the 279 * host_signal_handler() function and the functions it calls, including 280 * all syscalls which change the thread's signal mask. 281 * 282 * (2) Interruptible syscalls 283 * 284 * These are guest syscalls that can be interrupted by signals and 285 * for which we need to either return EINTR or arrange for the guest 286 * syscall to be restarted. This category includes both syscalls which 287 * always restart (and in the kernel return -ERESTARTNOINTR), ones 288 * which only restart if there is no handler (kernel returns -ERESTARTNOHAND 289 * or -ERESTART_RESTARTBLOCK), and the most common kind which restart 290 * if the handler was registered with SA_RESTART (kernel returns 291 * -ERESTARTSYS). System calls which are only interruptible in some 292 * situations (like 'open') also need to be handled this way. 293 * 294 * Here it is important that the host syscall is made 295 * via this safe_syscall() function, and *not* via the host libc. 296 * If the host libc is used then the implementation will appear to work 297 * most of the time, but there will be a race condition where a 298 * signal could arrive just before we make the host syscall inside libc, 299 * and then then guest syscall will not correctly be interrupted. 300 * Instead the implementation of the guest syscall can use the safe_syscall 301 * function but otherwise just return the result or errno in the usual 302 * way; the main loop code will take care of restarting the syscall 303 * if appropriate. 304 * 305 * (If the implementation needs to make multiple host syscalls this is 306 * OK; any which might really block must be via safe_syscall(); for those 307 * which are only technically blocking (ie which we know in practice won't 308 * stay in the host kernel indefinitely) it's OK to use libc if necessary. 309 * You must be able to cope with backing out correctly if some safe_syscall 310 * you make in the implementation returns either -TARGET_ERESTARTSYS or 311 * EINTR though.) 312 * 313 * block_signals() cannot be used for interruptible syscalls. 314 * 315 * 316 * How and why the safe_syscall implementation works: 317 * 318 * The basic setup is that we make the host syscall via a known 319 * section of host native assembly. If a signal occurs, our signal 320 * handler checks the interrupted host PC against the addresse of that 321 * known section. If the PC is before or at the address of the syscall 322 * instruction then we change the PC to point at a "return 323 * -TARGET_ERESTARTSYS" code path instead, and then exit the signal handler 324 * (causing the safe_syscall() call to immediately return that value). 325 * Then in the main.c loop if we see this magic return value we adjust 326 * the guest PC to wind it back to before the system call, and invoke 327 * the guest signal handler as usual. 328 * 329 * This winding-back will happen in two cases: 330 * (1) signal came in just before we took the host syscall (a race); 331 * in this case we'll take the guest signal and have another go 332 * at the syscall afterwards, and this is indistinguishable for the 333 * guest from the timing having been different such that the guest 334 * signal really did win the race 335 * (2) signal came in while the host syscall was blocking, and the 336 * host kernel decided the syscall should be restarted; 337 * in this case we want to restart the guest syscall also, and so 338 * rewinding is the right thing. (Note that "restart" semantics mean 339 * "first call the signal handler, then reattempt the syscall".) 340 * The other situation to consider is when a signal came in while the 341 * host syscall was blocking, and the host kernel decided that the syscall 342 * should not be restarted; in this case QEMU's host signal handler will 343 * be invoked with the PC pointing just after the syscall instruction, 344 * with registers indicating an EINTR return; the special code in the 345 * handler will not kick in, and we will return EINTR to the guest as 346 * we should. 347 * 348 * Notice that we can leave the host kernel to make the decision for 349 * us about whether to do a restart of the syscall or not; we do not 350 * need to check SA_RESTART flags in QEMU or distinguish the various 351 * kinds of restartability. 352 */ 353 #ifdef HAVE_SAFE_SYSCALL 354 /* The core part of this function is implemented in assembly */ 355 extern long safe_syscall_base(int *pending, long number, ...); 356 357 #define safe_syscall(...) \ 358 ({ \ 359 long ret_; \ 360 int *psp_ = &((TaskState *)thread_cpu->opaque)->signal_pending; \ 361 ret_ = safe_syscall_base(psp_, __VA_ARGS__); \ 362 if (is_error(ret_)) { \ 363 errno = -ret_; \ 364 ret_ = -1; \ 365 } \ 366 ret_; \ 367 }) 368 369 #else 370 371 /* Fallback for architectures which don't yet provide a safe-syscall assembly 372 * fragment; note that this is racy! 373 * This should go away when all host architectures have been updated. 374 */ 375 #define safe_syscall syscall 376 377 #endif 378 379 /* syscall.c */ 380 int host_to_target_waitstatus(int status); 381 382 /* strace.c */ 383 void print_syscall(int num, 384 abi_long arg1, abi_long arg2, abi_long arg3, 385 abi_long arg4, abi_long arg5, abi_long arg6); 386 void print_syscall_ret(int num, abi_long arg1); 387 /** 388 * print_taken_signal: 389 * @target_signum: target signal being taken 390 * @tinfo: target_siginfo_t which will be passed to the guest for the signal 391 * 392 * Print strace output indicating that this signal is being taken by the guest, 393 * in a format similar to: 394 * --- SIGSEGV {si_signo=SIGSEGV, si_code=SI_KERNEL, si_addr=0} --- 395 */ 396 void print_taken_signal(int target_signum, const target_siginfo_t *tinfo); 397 398 /* signal.c */ 399 void process_pending_signals(CPUArchState *cpu_env); 400 void signal_init(void); 401 int queue_signal(CPUArchState *env, int sig, int si_type, 402 target_siginfo_t *info); 403 void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info); 404 void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo); 405 int target_to_host_signal(int sig); 406 int host_to_target_signal(int sig); 407 long do_sigreturn(CPUArchState *env); 408 long do_rt_sigreturn(CPUArchState *env); 409 abi_long do_sigaltstack(abi_ulong uss_addr, abi_ulong uoss_addr, abi_ulong sp); 410 int do_sigprocmask(int how, const sigset_t *set, sigset_t *oldset); 411 abi_long do_swapcontext(CPUArchState *env, abi_ulong uold_ctx, 412 abi_ulong unew_ctx, abi_long ctx_size); 413 /** 414 * block_signals: block all signals while handling this guest syscall 415 * 416 * Block all signals, and arrange that the signal mask is returned to 417 * its correct value for the guest before we resume execution of guest code. 418 * If this function returns non-zero, then the caller should immediately 419 * return -TARGET_ERESTARTSYS to the main loop, which will take the pending 420 * signal and restart execution of the syscall. 421 * If block_signals() returns zero, then the caller can continue with 422 * emulation of the system call knowing that no signals can be taken 423 * (and therefore that no race conditions will result). 424 * This should only be called once, because if it is called a second time 425 * it will always return non-zero. (Think of it like a mutex that can't 426 * be recursively locked.) 427 * Signals will be unblocked again by process_pending_signals(). 428 * 429 * Return value: non-zero if there was a pending signal, zero if not. 430 */ 431 int block_signals(void); /* Returns non zero if signal pending */ 432 433 #ifdef TARGET_I386 434 /* vm86.c */ 435 void save_v86_state(CPUX86State *env); 436 void handle_vm86_trap(CPUX86State *env, int trapno); 437 void handle_vm86_fault(CPUX86State *env); 438 int do_vm86(CPUX86State *env, long subfunction, abi_ulong v86_addr); 439 #elif defined(TARGET_SPARC64) 440 void sparc64_set_context(CPUSPARCState *env); 441 void sparc64_get_context(CPUSPARCState *env); 442 #endif 443 444 /* mmap.c */ 445 int target_mprotect(abi_ulong start, abi_ulong len, int prot); 446 abi_long target_mmap(abi_ulong start, abi_ulong len, int prot, 447 int flags, int fd, abi_ulong offset); 448 int target_munmap(abi_ulong start, abi_ulong len); 449 abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size, 450 abi_ulong new_size, unsigned long flags, 451 abi_ulong new_addr); 452 extern unsigned long last_brk; 453 extern abi_ulong mmap_next_start; 454 abi_ulong mmap_find_vma(abi_ulong, abi_ulong, abi_ulong); 455 void mmap_fork_start(void); 456 void mmap_fork_end(int child); 457 458 /* main.c */ 459 extern unsigned long guest_stack_size; 460 461 /* user access */ 462 463 #define VERIFY_READ 0 464 #define VERIFY_WRITE 1 /* implies read access */ 465 466 static inline int access_ok(int type, abi_ulong addr, abi_ulong size) 467 { 468 return guest_addr_valid(addr) && 469 (size == 0 || guest_addr_valid(addr + size - 1)) && 470 page_check_range((target_ulong)addr, size, 471 (type == VERIFY_READ) ? PAGE_READ : (PAGE_READ | PAGE_WRITE)) == 0; 472 } 473 474 /* NOTE __get_user and __put_user use host pointers and don't check access. 475 These are usually used to access struct data members once the struct has 476 been locked - usually with lock_user_struct. */ 477 478 /* 479 * Tricky points: 480 * - Use __builtin_choose_expr to avoid type promotion from ?:, 481 * - Invalid sizes result in a compile time error stemming from 482 * the fact that abort has no parameters. 483 * - It's easier to use the endian-specific unaligned load/store 484 * functions than host-endian unaligned load/store plus tswapN. 485 * - The pragmas are necessary only to silence a clang false-positive 486 * warning: see https://bugs.llvm.org/show_bug.cgi?id=39113 . 487 * - gcc has bugs in its _Pragma() support in some versions, eg 488 * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83256 -- so we only 489 * include the warning-suppression pragmas for clang 490 */ 491 #if defined(__clang__) && __has_warning("-Waddress-of-packed-member") 492 #define PRAGMA_DISABLE_PACKED_WARNING \ 493 _Pragma("GCC diagnostic push"); \ 494 _Pragma("GCC diagnostic ignored \"-Waddress-of-packed-member\"") 495 496 #define PRAGMA_REENABLE_PACKED_WARNING \ 497 _Pragma("GCC diagnostic pop") 498 499 #else 500 #define PRAGMA_DISABLE_PACKED_WARNING 501 #define PRAGMA_REENABLE_PACKED_WARNING 502 #endif 503 504 #define __put_user_e(x, hptr, e) \ 505 do { \ 506 PRAGMA_DISABLE_PACKED_WARNING; \ 507 (__builtin_choose_expr(sizeof(*(hptr)) == 1, stb_p, \ 508 __builtin_choose_expr(sizeof(*(hptr)) == 2, stw_##e##_p, \ 509 __builtin_choose_expr(sizeof(*(hptr)) == 4, stl_##e##_p, \ 510 __builtin_choose_expr(sizeof(*(hptr)) == 8, stq_##e##_p, abort)))) \ 511 ((hptr), (x)), (void)0); \ 512 PRAGMA_REENABLE_PACKED_WARNING; \ 513 } while (0) 514 515 #define __get_user_e(x, hptr, e) \ 516 do { \ 517 PRAGMA_DISABLE_PACKED_WARNING; \ 518 ((x) = (typeof(*hptr))( \ 519 __builtin_choose_expr(sizeof(*(hptr)) == 1, ldub_p, \ 520 __builtin_choose_expr(sizeof(*(hptr)) == 2, lduw_##e##_p, \ 521 __builtin_choose_expr(sizeof(*(hptr)) == 4, ldl_##e##_p, \ 522 __builtin_choose_expr(sizeof(*(hptr)) == 8, ldq_##e##_p, abort)))) \ 523 (hptr)), (void)0); \ 524 PRAGMA_REENABLE_PACKED_WARNING; \ 525 } while (0) 526 527 528 #ifdef TARGET_WORDS_BIGENDIAN 529 # define __put_user(x, hptr) __put_user_e(x, hptr, be) 530 # define __get_user(x, hptr) __get_user_e(x, hptr, be) 531 #else 532 # define __put_user(x, hptr) __put_user_e(x, hptr, le) 533 # define __get_user(x, hptr) __get_user_e(x, hptr, le) 534 #endif 535 536 /* put_user()/get_user() take a guest address and check access */ 537 /* These are usually used to access an atomic data type, such as an int, 538 * that has been passed by address. These internally perform locking 539 * and unlocking on the data type. 540 */ 541 #define put_user(x, gaddr, target_type) \ 542 ({ \ 543 abi_ulong __gaddr = (gaddr); \ 544 target_type *__hptr; \ 545 abi_long __ret = 0; \ 546 if ((__hptr = lock_user(VERIFY_WRITE, __gaddr, sizeof(target_type), 0))) { \ 547 __put_user((x), __hptr); \ 548 unlock_user(__hptr, __gaddr, sizeof(target_type)); \ 549 } else \ 550 __ret = -TARGET_EFAULT; \ 551 __ret; \ 552 }) 553 554 #define get_user(x, gaddr, target_type) \ 555 ({ \ 556 abi_ulong __gaddr = (gaddr); \ 557 target_type *__hptr; \ 558 abi_long __ret = 0; \ 559 if ((__hptr = lock_user(VERIFY_READ, __gaddr, sizeof(target_type), 1))) { \ 560 __get_user((x), __hptr); \ 561 unlock_user(__hptr, __gaddr, 0); \ 562 } else { \ 563 /* avoid warning */ \ 564 (x) = 0; \ 565 __ret = -TARGET_EFAULT; \ 566 } \ 567 __ret; \ 568 }) 569 570 #define put_user_ual(x, gaddr) put_user((x), (gaddr), abi_ulong) 571 #define put_user_sal(x, gaddr) put_user((x), (gaddr), abi_long) 572 #define put_user_u64(x, gaddr) put_user((x), (gaddr), uint64_t) 573 #define put_user_s64(x, gaddr) put_user((x), (gaddr), int64_t) 574 #define put_user_u32(x, gaddr) put_user((x), (gaddr), uint32_t) 575 #define put_user_s32(x, gaddr) put_user((x), (gaddr), int32_t) 576 #define put_user_u16(x, gaddr) put_user((x), (gaddr), uint16_t) 577 #define put_user_s16(x, gaddr) put_user((x), (gaddr), int16_t) 578 #define put_user_u8(x, gaddr) put_user((x), (gaddr), uint8_t) 579 #define put_user_s8(x, gaddr) put_user((x), (gaddr), int8_t) 580 581 #define get_user_ual(x, gaddr) get_user((x), (gaddr), abi_ulong) 582 #define get_user_sal(x, gaddr) get_user((x), (gaddr), abi_long) 583 #define get_user_u64(x, gaddr) get_user((x), (gaddr), uint64_t) 584 #define get_user_s64(x, gaddr) get_user((x), (gaddr), int64_t) 585 #define get_user_u32(x, gaddr) get_user((x), (gaddr), uint32_t) 586 #define get_user_s32(x, gaddr) get_user((x), (gaddr), int32_t) 587 #define get_user_u16(x, gaddr) get_user((x), (gaddr), uint16_t) 588 #define get_user_s16(x, gaddr) get_user((x), (gaddr), int16_t) 589 #define get_user_u8(x, gaddr) get_user((x), (gaddr), uint8_t) 590 #define get_user_s8(x, gaddr) get_user((x), (gaddr), int8_t) 591 592 /* copy_from_user() and copy_to_user() are usually used to copy data 593 * buffers between the target and host. These internally perform 594 * locking/unlocking of the memory. 595 */ 596 abi_long copy_from_user(void *hptr, abi_ulong gaddr, size_t len); 597 abi_long copy_to_user(abi_ulong gaddr, void *hptr, size_t len); 598 599 /* Functions for accessing guest memory. The tget and tput functions 600 read/write single values, byteswapping as necessary. The lock_user function 601 gets a pointer to a contiguous area of guest memory, but does not perform 602 any byteswapping. lock_user may return either a pointer to the guest 603 memory, or a temporary buffer. */ 604 605 /* Lock an area of guest memory into the host. If copy is true then the 606 host area will have the same contents as the guest. */ 607 static inline void *lock_user(int type, abi_ulong guest_addr, long len, int copy) 608 { 609 if (!access_ok(type, guest_addr, len)) 610 return NULL; 611 #ifdef DEBUG_REMAP 612 { 613 void *addr; 614 addr = g_malloc(len); 615 if (copy) 616 memcpy(addr, g2h(guest_addr), len); 617 else 618 memset(addr, 0, len); 619 return addr; 620 } 621 #else 622 return g2h(guest_addr); 623 #endif 624 } 625 626 /* Unlock an area of guest memory. The first LEN bytes must be 627 flushed back to guest memory. host_ptr = NULL is explicitly 628 allowed and does nothing. */ 629 static inline void unlock_user(void *host_ptr, abi_ulong guest_addr, 630 long len) 631 { 632 633 #ifdef DEBUG_REMAP 634 if (!host_ptr) 635 return; 636 if (host_ptr == g2h(guest_addr)) 637 return; 638 if (len > 0) 639 memcpy(g2h(guest_addr), host_ptr, len); 640 g_free(host_ptr); 641 #endif 642 } 643 644 /* Return the length of a string in target memory or -TARGET_EFAULT if 645 access error. */ 646 abi_long target_strlen(abi_ulong gaddr); 647 648 /* Like lock_user but for null terminated strings. */ 649 static inline void *lock_user_string(abi_ulong guest_addr) 650 { 651 abi_long len; 652 len = target_strlen(guest_addr); 653 if (len < 0) 654 return NULL; 655 return lock_user(VERIFY_READ, guest_addr, (long)(len + 1), 1); 656 } 657 658 /* Helper macros for locking/unlocking a target struct. */ 659 #define lock_user_struct(type, host_ptr, guest_addr, copy) \ 660 (host_ptr = lock_user(type, guest_addr, sizeof(*host_ptr), copy)) 661 #define unlock_user_struct(host_ptr, guest_addr, copy) \ 662 unlock_user(host_ptr, guest_addr, (copy) ? sizeof(*host_ptr) : 0) 663 664 #include <pthread.h> 665 666 static inline int is_error(abi_long ret) 667 { 668 return (abi_ulong)ret >= (abi_ulong)(-4096); 669 } 670 671 /** 672 * preexit_cleanup: housekeeping before the guest exits 673 * 674 * env: the CPU state 675 * code: the exit code 676 */ 677 void preexit_cleanup(CPUArchState *env, int code); 678 679 /* Include target-specific struct and function definitions; 680 * they may need access to the target-independent structures 681 * above, so include them last. 682 */ 683 #include "target_cpu.h" 684 #include "target_structs.h" 685 686 #endif /* QEMU_H */ 687