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 #include "qemu/queue.h" 20 21 /* This is the size of the host kernel's sigset_t, needed where we make 22 * direct system calls that take a sigset_t pointer and a size. 23 */ 24 #define SIGSET_T_SIZE (_NSIG / 8) 25 26 /* This struct is used to hold certain information about the image. 27 * Basically, it replicates in user space what would be certain 28 * task_struct fields in the kernel 29 */ 30 struct image_info { 31 abi_ulong load_bias; 32 abi_ulong load_addr; 33 abi_ulong start_code; 34 abi_ulong end_code; 35 abi_ulong start_data; 36 abi_ulong end_data; 37 abi_ulong start_brk; 38 abi_ulong 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 66 #ifdef TARGET_I386 67 /* Information about the current linux thread */ 68 struct vm86_saved_state { 69 uint32_t eax; /* return code */ 70 uint32_t ebx; 71 uint32_t ecx; 72 uint32_t edx; 73 uint32_t esi; 74 uint32_t edi; 75 uint32_t ebp; 76 uint32_t esp; 77 uint32_t eflags; 78 uint32_t eip; 79 uint16_t cs, ss, ds, es, fs, gs; 80 }; 81 #endif 82 83 #if defined(TARGET_ARM) && defined(TARGET_ABI32) 84 /* FPU emulator */ 85 #include "nwfpe/fpa11.h" 86 #endif 87 88 #define MAX_SIGQUEUE_SIZE 1024 89 90 struct emulated_sigtable { 91 int pending; /* true if signal is pending */ 92 target_siginfo_t info; 93 }; 94 95 /* NOTE: we force a big alignment so that the stack stored after is 96 aligned too */ 97 typedef struct TaskState { 98 pid_t ts_tid; /* tid (or pid) of this task */ 99 #ifdef TARGET_ARM 100 # ifdef TARGET_ABI32 101 /* FPA state */ 102 FPA11 fpa; 103 # endif 104 int swi_errno; 105 #endif 106 #if defined(TARGET_I386) && !defined(TARGET_X86_64) 107 abi_ulong target_v86; 108 struct vm86_saved_state vm86_saved_regs; 109 struct target_vm86plus_struct vm86plus; 110 uint32_t v86flags; 111 uint32_t v86mask; 112 #endif 113 abi_ulong child_tidptr; 114 #ifdef TARGET_M68K 115 int sim_syscalls; 116 abi_ulong tp_value; 117 #endif 118 #if defined(TARGET_ARM) || defined(TARGET_M68K) 119 /* Extra fields for semihosted binaries. */ 120 abi_ulong heap_base; 121 abi_ulong heap_limit; 122 #endif 123 abi_ulong stack_base; 124 int used; /* non zero if used */ 125 struct image_info *info; 126 struct linux_binprm *bprm; 127 128 struct emulated_sigtable sync_signal; 129 struct emulated_sigtable sigtab[TARGET_NSIG]; 130 /* This thread's signal mask, as requested by the guest program. 131 * The actual signal mask of this thread may differ: 132 * + we don't let SIGSEGV and SIGBUS be blocked while running guest code 133 * + sometimes we block all signals to avoid races 134 */ 135 sigset_t signal_mask; 136 /* The signal mask imposed by a guest sigsuspend syscall, if we are 137 * currently in the middle of such a syscall 138 */ 139 sigset_t sigsuspend_mask; 140 /* Nonzero if we're leaving a sigsuspend and sigsuspend_mask is valid. */ 141 int in_sigsuspend; 142 143 /* Nonzero if process_pending_signals() needs to do something (either 144 * handle a pending signal or unblock signals). 145 * This flag is written from a signal handler so should be accessed via 146 * the atomic_read() and atomic_write() functions. (It is not accessed 147 * from multiple threads.) 148 */ 149 int signal_pending; 150 151 } __attribute__((aligned(16))) TaskState; 152 153 extern char *exec_path; 154 void init_task_state(TaskState *ts); 155 void task_settid(TaskState *); 156 void stop_all_tasks(void); 157 extern const char *qemu_uname_release; 158 extern unsigned long mmap_min_addr; 159 160 /* ??? See if we can avoid exposing so much of the loader internals. */ 161 162 /* Read a good amount of data initially, to hopefully get all the 163 program headers loaded. */ 164 #define BPRM_BUF_SIZE 1024 165 166 /* 167 * This structure is used to hold the arguments that are 168 * used when loading binaries. 169 */ 170 struct linux_binprm { 171 char buf[BPRM_BUF_SIZE] __attribute__((aligned)); 172 abi_ulong p; 173 int fd; 174 int e_uid, e_gid; 175 int argc, envc; 176 char **argv; 177 char **envp; 178 char * filename; /* Name of binary */ 179 int (*core_dump)(int, const CPUArchState *); /* coredump routine */ 180 }; 181 182 void do_init_thread(struct target_pt_regs *regs, struct image_info *infop); 183 abi_ulong loader_build_argptr(int envc, int argc, abi_ulong sp, 184 abi_ulong stringp, int push_ptr); 185 int loader_exec(int fdexec, const char *filename, char **argv, char **envp, 186 struct target_pt_regs * regs, struct image_info *infop, 187 struct linux_binprm *); 188 189 /* Returns true if the image uses the FDPIC ABI. If this is the case, 190 * we have to provide some information (loadmap, pt_dynamic_info) such 191 * that the program can be relocated adequately. This is also useful 192 * when handling signals. 193 */ 194 int info_is_fdpic(struct image_info *info); 195 196 uint32_t get_elf_eflags(int fd); 197 int load_elf_binary(struct linux_binprm *bprm, struct image_info *info); 198 int load_flt_binary(struct linux_binprm *bprm, struct image_info *info); 199 200 abi_long memcpy_to_target(abi_ulong dest, const void *src, 201 unsigned long len); 202 void target_set_brk(abi_ulong new_brk); 203 abi_long do_brk(abi_ulong new_brk); 204 void syscall_init(void); 205 abi_long do_syscall(void *cpu_env, int num, abi_long arg1, 206 abi_long arg2, abi_long arg3, abi_long arg4, 207 abi_long arg5, abi_long arg6, abi_long arg7, 208 abi_long arg8); 209 void gemu_log(const char *fmt, ...) GCC_FMT_ATTR(1, 2); 210 extern __thread CPUState *thread_cpu; 211 void cpu_loop(CPUArchState *env); 212 const char *target_strerror(int err); 213 int get_osversion(void); 214 void init_qemu_uname_release(void); 215 void fork_start(void); 216 void fork_end(int child); 217 218 /* Creates the initial guest address space in the host memory space using 219 * the given host start address hint and size. The guest_start parameter 220 * specifies the start address of the guest space. guest_base will be the 221 * difference between the host start address computed by this function and 222 * guest_start. If fixed is specified, then the mapped address space must 223 * start at host_start. The real start address of the mapped memory space is 224 * returned or -1 if there was an error. 225 */ 226 unsigned long init_guest_space(unsigned long host_start, 227 unsigned long host_size, 228 unsigned long guest_start, 229 bool fixed); 230 231 #include "qemu/log.h" 232 233 /* safe_syscall.S */ 234 235 /** 236 * safe_syscall: 237 * @int number: number of system call to make 238 * ...: arguments to the system call 239 * 240 * Call a system call if guest signal not pending. 241 * This has the same API as the libc syscall() function, except that it 242 * may return -1 with errno == TARGET_ERESTARTSYS if a signal was pending. 243 * 244 * Returns: the system call result, or -1 with an error code in errno 245 * (Errnos are host errnos; we rely on TARGET_ERESTARTSYS not clashing 246 * with any of the host errno values.) 247 */ 248 249 /* A guide to using safe_syscall() to handle interactions between guest 250 * syscalls and guest signals: 251 * 252 * Guest syscalls come in two flavours: 253 * 254 * (1) Non-interruptible syscalls 255 * 256 * These are guest syscalls that never get interrupted by signals and 257 * so never return EINTR. They can be implemented straightforwardly in 258 * QEMU: just make sure that if the implementation code has to make any 259 * blocking calls that those calls are retried if they return EINTR. 260 * It's also OK to implement these with safe_syscall, though it will be 261 * a little less efficient if a signal is delivered at the 'wrong' moment. 262 * 263 * Some non-interruptible syscalls need to be handled using block_signals() 264 * to block signals for the duration of the syscall. This mainly applies 265 * to code which needs to modify the data structures used by the 266 * host_signal_handler() function and the functions it calls, including 267 * all syscalls which change the thread's signal mask. 268 * 269 * (2) Interruptible syscalls 270 * 271 * These are guest syscalls that can be interrupted by signals and 272 * for which we need to either return EINTR or arrange for the guest 273 * syscall to be restarted. This category includes both syscalls which 274 * always restart (and in the kernel return -ERESTARTNOINTR), ones 275 * which only restart if there is no handler (kernel returns -ERESTARTNOHAND 276 * or -ERESTART_RESTARTBLOCK), and the most common kind which restart 277 * if the handler was registered with SA_RESTART (kernel returns 278 * -ERESTARTSYS). System calls which are only interruptible in some 279 * situations (like 'open') also need to be handled this way. 280 * 281 * Here it is important that the host syscall is made 282 * via this safe_syscall() function, and *not* via the host libc. 283 * If the host libc is used then the implementation will appear to work 284 * most of the time, but there will be a race condition where a 285 * signal could arrive just before we make the host syscall inside libc, 286 * and then then guest syscall will not correctly be interrupted. 287 * Instead the implementation of the guest syscall can use the safe_syscall 288 * function but otherwise just return the result or errno in the usual 289 * way; the main loop code will take care of restarting the syscall 290 * if appropriate. 291 * 292 * (If the implementation needs to make multiple host syscalls this is 293 * OK; any which might really block must be via safe_syscall(); for those 294 * which are only technically blocking (ie which we know in practice won't 295 * stay in the host kernel indefinitely) it's OK to use libc if necessary. 296 * You must be able to cope with backing out correctly if some safe_syscall 297 * you make in the implementation returns either -TARGET_ERESTARTSYS or 298 * EINTR though.) 299 * 300 * block_signals() cannot be used for interruptible syscalls. 301 * 302 * 303 * How and why the safe_syscall implementation works: 304 * 305 * The basic setup is that we make the host syscall via a known 306 * section of host native assembly. If a signal occurs, our signal 307 * handler checks the interrupted host PC against the addresse of that 308 * known section. If the PC is before or at the address of the syscall 309 * instruction then we change the PC to point at a "return 310 * -TARGET_ERESTARTSYS" code path instead, and then exit the signal handler 311 * (causing the safe_syscall() call to immediately return that value). 312 * Then in the main.c loop if we see this magic return value we adjust 313 * the guest PC to wind it back to before the system call, and invoke 314 * the guest signal handler as usual. 315 * 316 * This winding-back will happen in two cases: 317 * (1) signal came in just before we took the host syscall (a race); 318 * in this case we'll take the guest signal and have another go 319 * at the syscall afterwards, and this is indistinguishable for the 320 * guest from the timing having been different such that the guest 321 * signal really did win the race 322 * (2) signal came in while the host syscall was blocking, and the 323 * host kernel decided the syscall should be restarted; 324 * in this case we want to restart the guest syscall also, and so 325 * rewinding is the right thing. (Note that "restart" semantics mean 326 * "first call the signal handler, then reattempt the syscall".) 327 * The other situation to consider is when a signal came in while the 328 * host syscall was blocking, and the host kernel decided that the syscall 329 * should not be restarted; in this case QEMU's host signal handler will 330 * be invoked with the PC pointing just after the syscall instruction, 331 * with registers indicating an EINTR return; the special code in the 332 * handler will not kick in, and we will return EINTR to the guest as 333 * we should. 334 * 335 * Notice that we can leave the host kernel to make the decision for 336 * us about whether to do a restart of the syscall or not; we do not 337 * need to check SA_RESTART flags in QEMU or distinguish the various 338 * kinds of restartability. 339 */ 340 #ifdef HAVE_SAFE_SYSCALL 341 /* The core part of this function is implemented in assembly */ 342 extern long safe_syscall_base(int *pending, long number, ...); 343 344 #define safe_syscall(...) \ 345 ({ \ 346 long ret_; \ 347 int *psp_ = &((TaskState *)thread_cpu->opaque)->signal_pending; \ 348 ret_ = safe_syscall_base(psp_, __VA_ARGS__); \ 349 if (is_error(ret_)) { \ 350 errno = -ret_; \ 351 ret_ = -1; \ 352 } \ 353 ret_; \ 354 }) 355 356 #else 357 358 /* Fallback for architectures which don't yet provide a safe-syscall assembly 359 * fragment; note that this is racy! 360 * This should go away when all host architectures have been updated. 361 */ 362 #define safe_syscall syscall 363 364 #endif 365 366 /* syscall.c */ 367 int host_to_target_waitstatus(int status); 368 369 /* strace.c */ 370 void print_syscall(int num, 371 abi_long arg1, abi_long arg2, abi_long arg3, 372 abi_long arg4, abi_long arg5, abi_long arg6); 373 void print_syscall_ret(int num, abi_long arg1); 374 /** 375 * print_taken_signal: 376 * @target_signum: target signal being taken 377 * @tinfo: target_siginfo_t which will be passed to the guest for the signal 378 * 379 * Print strace output indicating that this signal is being taken by the guest, 380 * in a format similar to: 381 * --- SIGSEGV {si_signo=SIGSEGV, si_code=SI_KERNEL, si_addr=0} --- 382 */ 383 void print_taken_signal(int target_signum, const target_siginfo_t *tinfo); 384 extern int do_strace; 385 386 /* signal.c */ 387 void process_pending_signals(CPUArchState *cpu_env); 388 void signal_init(void); 389 int queue_signal(CPUArchState *env, int sig, int si_type, 390 target_siginfo_t *info); 391 void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info); 392 void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo); 393 int target_to_host_signal(int sig); 394 int host_to_target_signal(int sig); 395 long do_sigreturn(CPUArchState *env); 396 long do_rt_sigreturn(CPUArchState *env); 397 abi_long do_sigaltstack(abi_ulong uss_addr, abi_ulong uoss_addr, abi_ulong sp); 398 int do_sigprocmask(int how, const sigset_t *set, sigset_t *oldset); 399 abi_long do_swapcontext(CPUArchState *env, abi_ulong uold_ctx, 400 abi_ulong unew_ctx, abi_long ctx_size); 401 /** 402 * block_signals: block all signals while handling this guest syscall 403 * 404 * Block all signals, and arrange that the signal mask is returned to 405 * its correct value for the guest before we resume execution of guest code. 406 * If this function returns non-zero, then the caller should immediately 407 * return -TARGET_ERESTARTSYS to the main loop, which will take the pending 408 * signal and restart execution of the syscall. 409 * If block_signals() returns zero, then the caller can continue with 410 * emulation of the system call knowing that no signals can be taken 411 * (and therefore that no race conditions will result). 412 * This should only be called once, because if it is called a second time 413 * it will always return non-zero. (Think of it like a mutex that can't 414 * be recursively locked.) 415 * Signals will be unblocked again by process_pending_signals(). 416 * 417 * Return value: non-zero if there was a pending signal, zero if not. 418 */ 419 int block_signals(void); /* Returns non zero if signal pending */ 420 421 #ifdef TARGET_I386 422 /* vm86.c */ 423 void save_v86_state(CPUX86State *env); 424 void handle_vm86_trap(CPUX86State *env, int trapno); 425 void handle_vm86_fault(CPUX86State *env); 426 int do_vm86(CPUX86State *env, long subfunction, abi_ulong v86_addr); 427 #elif defined(TARGET_SPARC64) 428 void sparc64_set_context(CPUSPARCState *env); 429 void sparc64_get_context(CPUSPARCState *env); 430 #endif 431 432 /* mmap.c */ 433 int target_mprotect(abi_ulong start, abi_ulong len, int prot); 434 abi_long target_mmap(abi_ulong start, abi_ulong len, int prot, 435 int flags, int fd, abi_ulong offset); 436 int target_munmap(abi_ulong start, abi_ulong len); 437 abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size, 438 abi_ulong new_size, unsigned long flags, 439 abi_ulong new_addr); 440 extern unsigned long last_brk; 441 extern abi_ulong mmap_next_start; 442 abi_ulong mmap_find_vma(abi_ulong, abi_ulong); 443 void mmap_fork_start(void); 444 void mmap_fork_end(int child); 445 446 /* main.c */ 447 extern unsigned long guest_stack_size; 448 449 /* user access */ 450 451 #define VERIFY_READ 0 452 #define VERIFY_WRITE 1 /* implies read access */ 453 454 static inline int access_ok(int type, abi_ulong addr, abi_ulong size) 455 { 456 return page_check_range((target_ulong)addr, size, 457 (type == VERIFY_READ) ? PAGE_READ : (PAGE_READ | PAGE_WRITE)) == 0; 458 } 459 460 /* NOTE __get_user and __put_user use host pointers and don't check access. 461 These are usually used to access struct data members once the struct has 462 been locked - usually with lock_user_struct. */ 463 464 /* Tricky points: 465 - Use __builtin_choose_expr to avoid type promotion from ?:, 466 - Invalid sizes result in a compile time error stemming from 467 the fact that abort has no parameters. 468 - It's easier to use the endian-specific unaligned load/store 469 functions than host-endian unaligned load/store plus tswapN. */ 470 471 #define __put_user_e(x, hptr, e) \ 472 (__builtin_choose_expr(sizeof(*(hptr)) == 1, stb_p, \ 473 __builtin_choose_expr(sizeof(*(hptr)) == 2, stw_##e##_p, \ 474 __builtin_choose_expr(sizeof(*(hptr)) == 4, stl_##e##_p, \ 475 __builtin_choose_expr(sizeof(*(hptr)) == 8, stq_##e##_p, abort)))) \ 476 ((hptr), (x)), (void)0) 477 478 #define __get_user_e(x, hptr, e) \ 479 ((x) = (typeof(*hptr))( \ 480 __builtin_choose_expr(sizeof(*(hptr)) == 1, ldub_p, \ 481 __builtin_choose_expr(sizeof(*(hptr)) == 2, lduw_##e##_p, \ 482 __builtin_choose_expr(sizeof(*(hptr)) == 4, ldl_##e##_p, \ 483 __builtin_choose_expr(sizeof(*(hptr)) == 8, ldq_##e##_p, abort)))) \ 484 (hptr)), (void)0) 485 486 #ifdef TARGET_WORDS_BIGENDIAN 487 # define __put_user(x, hptr) __put_user_e(x, hptr, be) 488 # define __get_user(x, hptr) __get_user_e(x, hptr, be) 489 #else 490 # define __put_user(x, hptr) __put_user_e(x, hptr, le) 491 # define __get_user(x, hptr) __get_user_e(x, hptr, le) 492 #endif 493 494 /* put_user()/get_user() take a guest address and check access */ 495 /* These are usually used to access an atomic data type, such as an int, 496 * that has been passed by address. These internally perform locking 497 * and unlocking on the data type. 498 */ 499 #define put_user(x, gaddr, target_type) \ 500 ({ \ 501 abi_ulong __gaddr = (gaddr); \ 502 target_type *__hptr; \ 503 abi_long __ret = 0; \ 504 if ((__hptr = lock_user(VERIFY_WRITE, __gaddr, sizeof(target_type), 0))) { \ 505 __put_user((x), __hptr); \ 506 unlock_user(__hptr, __gaddr, sizeof(target_type)); \ 507 } else \ 508 __ret = -TARGET_EFAULT; \ 509 __ret; \ 510 }) 511 512 #define get_user(x, gaddr, target_type) \ 513 ({ \ 514 abi_ulong __gaddr = (gaddr); \ 515 target_type *__hptr; \ 516 abi_long __ret = 0; \ 517 if ((__hptr = lock_user(VERIFY_READ, __gaddr, sizeof(target_type), 1))) { \ 518 __get_user((x), __hptr); \ 519 unlock_user(__hptr, __gaddr, 0); \ 520 } else { \ 521 /* avoid warning */ \ 522 (x) = 0; \ 523 __ret = -TARGET_EFAULT; \ 524 } \ 525 __ret; \ 526 }) 527 528 #define put_user_ual(x, gaddr) put_user((x), (gaddr), abi_ulong) 529 #define put_user_sal(x, gaddr) put_user((x), (gaddr), abi_long) 530 #define put_user_u64(x, gaddr) put_user((x), (gaddr), uint64_t) 531 #define put_user_s64(x, gaddr) put_user((x), (gaddr), int64_t) 532 #define put_user_u32(x, gaddr) put_user((x), (gaddr), uint32_t) 533 #define put_user_s32(x, gaddr) put_user((x), (gaddr), int32_t) 534 #define put_user_u16(x, gaddr) put_user((x), (gaddr), uint16_t) 535 #define put_user_s16(x, gaddr) put_user((x), (gaddr), int16_t) 536 #define put_user_u8(x, gaddr) put_user((x), (gaddr), uint8_t) 537 #define put_user_s8(x, gaddr) put_user((x), (gaddr), int8_t) 538 539 #define get_user_ual(x, gaddr) get_user((x), (gaddr), abi_ulong) 540 #define get_user_sal(x, gaddr) get_user((x), (gaddr), abi_long) 541 #define get_user_u64(x, gaddr) get_user((x), (gaddr), uint64_t) 542 #define get_user_s64(x, gaddr) get_user((x), (gaddr), int64_t) 543 #define get_user_u32(x, gaddr) get_user((x), (gaddr), uint32_t) 544 #define get_user_s32(x, gaddr) get_user((x), (gaddr), int32_t) 545 #define get_user_u16(x, gaddr) get_user((x), (gaddr), uint16_t) 546 #define get_user_s16(x, gaddr) get_user((x), (gaddr), int16_t) 547 #define get_user_u8(x, gaddr) get_user((x), (gaddr), uint8_t) 548 #define get_user_s8(x, gaddr) get_user((x), (gaddr), int8_t) 549 550 /* copy_from_user() and copy_to_user() are usually used to copy data 551 * buffers between the target and host. These internally perform 552 * locking/unlocking of the memory. 553 */ 554 abi_long copy_from_user(void *hptr, abi_ulong gaddr, size_t len); 555 abi_long copy_to_user(abi_ulong gaddr, void *hptr, size_t len); 556 557 /* Functions for accessing guest memory. The tget and tput functions 558 read/write single values, byteswapping as necessary. The lock_user function 559 gets a pointer to a contiguous area of guest memory, but does not perform 560 any byteswapping. lock_user may return either a pointer to the guest 561 memory, or a temporary buffer. */ 562 563 /* Lock an area of guest memory into the host. If copy is true then the 564 host area will have the same contents as the guest. */ 565 static inline void *lock_user(int type, abi_ulong guest_addr, long len, int copy) 566 { 567 if (!access_ok(type, guest_addr, len)) 568 return NULL; 569 #ifdef DEBUG_REMAP 570 { 571 void *addr; 572 addr = g_malloc(len); 573 if (copy) 574 memcpy(addr, g2h(guest_addr), len); 575 else 576 memset(addr, 0, len); 577 return addr; 578 } 579 #else 580 return g2h(guest_addr); 581 #endif 582 } 583 584 /* Unlock an area of guest memory. The first LEN bytes must be 585 flushed back to guest memory. host_ptr = NULL is explicitly 586 allowed and does nothing. */ 587 static inline void unlock_user(void *host_ptr, abi_ulong guest_addr, 588 long len) 589 { 590 591 #ifdef DEBUG_REMAP 592 if (!host_ptr) 593 return; 594 if (host_ptr == g2h(guest_addr)) 595 return; 596 if (len > 0) 597 memcpy(g2h(guest_addr), host_ptr, len); 598 g_free(host_ptr); 599 #endif 600 } 601 602 /* Return the length of a string in target memory or -TARGET_EFAULT if 603 access error. */ 604 abi_long target_strlen(abi_ulong gaddr); 605 606 /* Like lock_user but for null terminated strings. */ 607 static inline void *lock_user_string(abi_ulong guest_addr) 608 { 609 abi_long len; 610 len = target_strlen(guest_addr); 611 if (len < 0) 612 return NULL; 613 return lock_user(VERIFY_READ, guest_addr, (long)(len + 1), 1); 614 } 615 616 /* Helper macros for locking/unlocking a target struct. */ 617 #define lock_user_struct(type, host_ptr, guest_addr, copy) \ 618 (host_ptr = lock_user(type, guest_addr, sizeof(*host_ptr), copy)) 619 #define unlock_user_struct(host_ptr, guest_addr, copy) \ 620 unlock_user(host_ptr, guest_addr, (copy) ? sizeof(*host_ptr) : 0) 621 622 #include <pthread.h> 623 624 static inline int is_error(abi_long ret) 625 { 626 return (abi_ulong)ret >= (abi_ulong)(-4096); 627 } 628 629 /** 630 * preexit_cleanup: housekeeping before the guest exits 631 * 632 * env: the CPU state 633 * code: the exit code 634 */ 635 void preexit_cleanup(CPUArchState *env, int code); 636 637 /* Include target-specific struct and function definitions; 638 * they may need access to the target-independent structures 639 * above, so include them last. 640 */ 641 #include "target_cpu.h" 642 #include "target_structs.h" 643 644 #endif /* QEMU_H */ 645