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 start_mmap; |
39 | abi_ulong start_stack; |
40 | abi_ulong stack_limit; |
41 | abi_ulong entry; |
42 | abi_ulong code_offset; |
43 | abi_ulong data_offset; |
44 | abi_ulong saved_auxv; |
45 | abi_ulong auxv_len; |
46 | abi_ulong arg_start; |
47 | abi_ulong arg_end; |
48 | abi_ulong arg_strings; |
49 | abi_ulong env_strings; |
50 | abi_ulong file_string; |
51 | uint32_t elf_flags; |
52 | int personality; |
53 | abi_ulong alignment; |
54 | |
55 | /* The fields below are used in FDPIC mode. */ |
56 | abi_ulong loadmap_addr; |
57 | uint16_t nsegs; |
58 | void *loadsegs; |
59 | abi_ulong pt_dynamic_addr; |
60 | abi_ulong interpreter_loadmap_addr; |
61 | abi_ulong interpreter_pt_dynamic_addr; |
62 | struct image_info *other_info; |
63 | #ifdef TARGET_MIPS |
64 | int fp_abi; |
65 | int interp_fp_abi; |
66 | #endif |
67 | }; |
68 | |
69 | #ifdef TARGET_I386 |
70 | /* Information about the current linux thread */ |
71 | struct vm86_saved_state { |
72 | uint32_t eax; /* return code */ |
73 | uint32_t ebx; |
74 | uint32_t ecx; |
75 | uint32_t edx; |
76 | uint32_t esi; |
77 | uint32_t edi; |
78 | uint32_t ebp; |
79 | uint32_t esp; |
80 | uint32_t eflags; |
81 | uint32_t eip; |
82 | uint16_t cs, ss, ds, es, fs, gs; |
83 | }; |
84 | #endif |
85 | |
86 | #if defined(TARGET_ARM) && defined(TARGET_ABI32) |
87 | /* FPU emulator */ |
88 | #include "nwfpe/fpa11.h" |
89 | #endif |
90 | |
91 | #define MAX_SIGQUEUE_SIZE 1024 |
92 | |
93 | struct emulated_sigtable { |
94 | int pending; /* true if signal is pending */ |
95 | target_siginfo_t info; |
96 | }; |
97 | |
98 | /* NOTE: we force a big alignment so that the stack stored after is |
99 | aligned too */ |
100 | typedef struct TaskState { |
101 | pid_t ts_tid; /* tid (or pid) of this task */ |
102 | #ifdef TARGET_ARM |
103 | # ifdef TARGET_ABI32 |
104 | /* FPA state */ |
105 | FPA11 fpa; |
106 | # endif |
107 | int swi_errno; |
108 | #endif |
109 | #if defined(TARGET_I386) && !defined(TARGET_X86_64) |
110 | abi_ulong target_v86; |
111 | struct vm86_saved_state vm86_saved_regs; |
112 | struct target_vm86plus_struct vm86plus; |
113 | uint32_t v86flags; |
114 | uint32_t v86mask; |
115 | #endif |
116 | abi_ulong child_tidptr; |
117 | #ifdef TARGET_M68K |
118 | abi_ulong tp_value; |
119 | #endif |
120 | #if defined(TARGET_ARM) || defined(TARGET_M68K) |
121 | /* Extra fields for semihosted binaries. */ |
122 | abi_ulong heap_base; |
123 | abi_ulong heap_limit; |
124 | #endif |
125 | abi_ulong stack_base; |
126 | int used; /* non zero if used */ |
127 | struct image_info *info; |
128 | struct linux_binprm *bprm; |
129 | |
130 | struct emulated_sigtable sync_signal; |
131 | struct emulated_sigtable sigtab[TARGET_NSIG]; |
132 | /* This thread's signal mask, as requested by the guest program. |
133 | * The actual signal mask of this thread may differ: |
134 | * + we don't let SIGSEGV and SIGBUS be blocked while running guest code |
135 | * + sometimes we block all signals to avoid races |
136 | */ |
137 | sigset_t signal_mask; |
138 | /* The signal mask imposed by a guest sigsuspend syscall, if we are |
139 | * currently in the middle of such a syscall |
140 | */ |
141 | sigset_t sigsuspend_mask; |
142 | /* Nonzero if we're leaving a sigsuspend and sigsuspend_mask is valid. */ |
143 | int in_sigsuspend; |
144 | |
145 | /* Nonzero if process_pending_signals() needs to do something (either |
146 | * handle a pending signal or unblock signals). |
147 | * This flag is written from a signal handler so should be accessed via |
148 | * the atomic_read() and atomic_set() functions. (It is not accessed |
149 | * from multiple threads.) |
150 | */ |
151 | int signal_pending; |
152 | |
153 | /* This thread's sigaltstack, if it has one */ |
154 | struct target_sigaltstack sigaltstack_used; |
155 | } __attribute__((aligned(16))) TaskState; |
156 | |
157 | extern char *exec_path; |
158 | void init_task_state(TaskState *ts); |
159 | void task_settid(TaskState *); |
160 | void stop_all_tasks(void); |
161 | extern const char *qemu_uname_release; |
162 | extern unsigned long mmap_min_addr; |
163 | |
164 | /* ??? See if we can avoid exposing so much of the loader internals. */ |
165 | |
166 | /* Read a good amount of data initially, to hopefully get all the |
167 | program headers loaded. */ |
168 | #define BPRM_BUF_SIZE 1024 |
169 | |
170 | /* |
171 | * This structure is used to hold the arguments that are |
172 | * used when loading binaries. |
173 | */ |
174 | struct linux_binprm { |
175 | char buf[BPRM_BUF_SIZE] __attribute__((aligned)); |
176 | abi_ulong p; |
177 | int fd; |
178 | int e_uid, e_gid; |
179 | int argc, envc; |
180 | char **argv; |
181 | char **envp; |
182 | char * filename; /* Name of binary */ |
183 | int (*core_dump)(int, const CPUArchState *); /* coredump routine */ |
184 | }; |
185 | |
186 | void do_init_thread(struct target_pt_regs *regs, struct image_info *infop); |
187 | abi_ulong loader_build_argptr(int envc, int argc, abi_ulong sp, |
188 | abi_ulong stringp, int push_ptr); |
189 | int loader_exec(int fdexec, const char *filename, char **argv, char **envp, |
190 | struct target_pt_regs * regs, struct image_info *infop, |
191 | struct linux_binprm *); |
192 | |
193 | /* Returns true if the image uses the FDPIC ABI. If this is the case, |
194 | * we have to provide some information (loadmap, pt_dynamic_info) such |
195 | * that the program can be relocated adequately. This is also useful |
196 | * when handling signals. |
197 | */ |
198 | int info_is_fdpic(struct image_info *info); |
199 | |
200 | uint32_t get_elf_eflags(int fd); |
201 | int load_elf_binary(struct linux_binprm *bprm, struct image_info *info); |
202 | int load_flt_binary(struct linux_binprm *bprm, struct image_info *info); |
203 | |
204 | abi_long memcpy_to_target(abi_ulong dest, const void *src, |
205 | unsigned long len); |
206 | void target_set_brk(abi_ulong new_brk); |
207 | abi_long do_brk(abi_ulong new_brk); |
208 | void syscall_init(void); |
209 | abi_long do_syscall(void *cpu_env, int num, abi_long arg1, |
210 | abi_long arg2, abi_long arg3, abi_long arg4, |
211 | abi_long arg5, abi_long arg6, abi_long arg7, |
212 | abi_long arg8); |
213 | void gemu_log(const char *fmt, ...) GCC_FMT_ATTR(1, 2); |
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 | /* Creates the initial guest address space in the host memory space using |
223 | * the given host start address hint and size. The guest_start parameter |
224 | * specifies the start address of the guest space. guest_base will be the |
225 | * difference between the host start address computed by this function and |
226 | * guest_start. If fixed is specified, then the mapped address space must |
227 | * start at host_start. The real start address of the mapped memory space is |
228 | * returned or -1 if there was an error. |
229 | */ |
230 | unsigned long init_guest_space(unsigned long host_start, |
231 | unsigned long host_size, |
232 | unsigned long guest_start, |
233 | bool fixed); |
234 | |
235 | #include "qemu/log.h" |
236 | |
237 | /* safe_syscall.S */ |
238 | |
239 | /** |
240 | * safe_syscall: |
241 | * @int number: number of system call to make |
242 | * ...: arguments to the system call |
243 | * |
244 | * Call a system call if guest signal not pending. |
245 | * This has the same API as the libc syscall() function, except that it |
246 | * may return -1 with errno == TARGET_ERESTARTSYS if a signal was pending. |
247 | * |
248 | * Returns: the system call result, or -1 with an error code in errno |
249 | * (Errnos are host errnos; we rely on TARGET_ERESTARTSYS not clashing |
250 | * with any of the host errno values.) |
251 | */ |
252 | |
253 | /* A guide to using safe_syscall() to handle interactions between guest |
254 | * syscalls and guest signals: |
255 | * |
256 | * Guest syscalls come in two flavours: |
257 | * |
258 | * (1) Non-interruptible syscalls |
259 | * |
260 | * These are guest syscalls that never get interrupted by signals and |
261 | * so never return EINTR. They can be implemented straightforwardly in |
262 | * QEMU: just make sure that if the implementation code has to make any |
263 | * blocking calls that those calls are retried if they return EINTR. |
264 | * It's also OK to implement these with safe_syscall, though it will be |
265 | * a little less efficient if a signal is delivered at the 'wrong' moment. |
266 | * |
267 | * Some non-interruptible syscalls need to be handled using block_signals() |
268 | * to block signals for the duration of the syscall. This mainly applies |
269 | * to code which needs to modify the data structures used by the |
270 | * host_signal_handler() function and the functions it calls, including |
271 | * all syscalls which change the thread's signal mask. |
272 | * |
273 | * (2) Interruptible syscalls |
274 | * |
275 | * These are guest syscalls that can be interrupted by signals and |
276 | * for which we need to either return EINTR or arrange for the guest |
277 | * syscall to be restarted. This category includes both syscalls which |
278 | * always restart (and in the kernel return -ERESTARTNOINTR), ones |
279 | * which only restart if there is no handler (kernel returns -ERESTARTNOHAND |
280 | * or -ERESTART_RESTARTBLOCK), and the most common kind which restart |
281 | * if the handler was registered with SA_RESTART (kernel returns |
282 | * -ERESTARTSYS). System calls which are only interruptible in some |
283 | * situations (like 'open') also need to be handled this way. |
284 | * |
285 | * Here it is important that the host syscall is made |
286 | * via this safe_syscall() function, and *not* via the host libc. |
287 | * If the host libc is used then the implementation will appear to work |
288 | * most of the time, but there will be a race condition where a |
289 | * signal could arrive just before we make the host syscall inside libc, |
290 | * and then then guest syscall will not correctly be interrupted. |
291 | * Instead the implementation of the guest syscall can use the safe_syscall |
292 | * function but otherwise just return the result or errno in the usual |
293 | * way; the main loop code will take care of restarting the syscall |
294 | * if appropriate. |
295 | * |
296 | * (If the implementation needs to make multiple host syscalls this is |
297 | * OK; any which might really block must be via safe_syscall(); for those |
298 | * which are only technically blocking (ie which we know in practice won't |
299 | * stay in the host kernel indefinitely) it's OK to use libc if necessary. |
300 | * You must be able to cope with backing out correctly if some safe_syscall |
301 | * you make in the implementation returns either -TARGET_ERESTARTSYS or |
302 | * EINTR though.) |
303 | * |
304 | * block_signals() cannot be used for interruptible syscalls. |
305 | * |
306 | * |
307 | * How and why the safe_syscall implementation works: |
308 | * |
309 | * The basic setup is that we make the host syscall via a known |
310 | * section of host native assembly. If a signal occurs, our signal |
311 | * handler checks the interrupted host PC against the addresse of that |
312 | * known section. If the PC is before or at the address of the syscall |
313 | * instruction then we change the PC to point at a "return |
314 | * -TARGET_ERESTARTSYS" code path instead, and then exit the signal handler |
315 | * (causing the safe_syscall() call to immediately return that value). |
316 | * Then in the main.c loop if we see this magic return value we adjust |
317 | * the guest PC to wind it back to before the system call, and invoke |
318 | * the guest signal handler as usual. |
319 | * |
320 | * This winding-back will happen in two cases: |
321 | * (1) signal came in just before we took the host syscall (a race); |
322 | * in this case we'll take the guest signal and have another go |
323 | * at the syscall afterwards, and this is indistinguishable for the |
324 | * guest from the timing having been different such that the guest |
325 | * signal really did win the race |
326 | * (2) signal came in while the host syscall was blocking, and the |
327 | * host kernel decided the syscall should be restarted; |
328 | * in this case we want to restart the guest syscall also, and so |
329 | * rewinding is the right thing. (Note that "restart" semantics mean |
330 | * "first call the signal handler, then reattempt the syscall".) |
331 | * The other situation to consider is when a signal came in while the |
332 | * host syscall was blocking, and the host kernel decided that the syscall |
333 | * should not be restarted; in this case QEMU's host signal handler will |
334 | * be invoked with the PC pointing just after the syscall instruction, |
335 | * with registers indicating an EINTR return; the special code in the |
336 | * handler will not kick in, and we will return EINTR to the guest as |
337 | * we should. |
338 | * |
339 | * Notice that we can leave the host kernel to make the decision for |
340 | * us about whether to do a restart of the syscall or not; we do not |
341 | * need to check SA_RESTART flags in QEMU or distinguish the various |
342 | * kinds of restartability. |
343 | */ |
344 | #ifdef HAVE_SAFE_SYSCALL |
345 | /* The core part of this function is implemented in assembly */ |
346 | extern long safe_syscall_base(int *pending, long number, ...); |
347 | |
348 | #define safe_syscall(...) \ |
349 | ({ \ |
350 | long ret_; \ |
351 | int *psp_ = &((TaskState *)thread_cpu->opaque)->signal_pending; \ |
352 | ret_ = safe_syscall_base(psp_, __VA_ARGS__); \ |
353 | if (is_error(ret_)) { \ |
354 | errno = -ret_; \ |
355 | ret_ = -1; \ |
356 | } \ |
357 | ret_; \ |
358 | }) |
359 | |
360 | #else |
361 | |
362 | /* Fallback for architectures which don't yet provide a safe-syscall assembly |
363 | * fragment; note that this is racy! |
364 | * This should go away when all host architectures have been updated. |
365 | */ |
366 | #define safe_syscall syscall |
367 | |
368 | #endif |
369 | |
370 | /* syscall.c */ |
371 | int host_to_target_waitstatus(int status); |
372 | |
373 | /* strace.c */ |
374 | void print_syscall(int num, |
375 | abi_long arg1, abi_long arg2, abi_long arg3, |
376 | abi_long arg4, abi_long arg5, abi_long arg6); |
377 | void print_syscall_ret(int num, abi_long arg1); |
378 | /** |
379 | * print_taken_signal: |
380 | * @target_signum: target signal being taken |
381 | * @tinfo: target_siginfo_t which will be passed to the guest for the signal |
382 | * |
383 | * Print strace output indicating that this signal is being taken by the guest, |
384 | * in a format similar to: |
385 | * --- SIGSEGV {si_signo=SIGSEGV, si_code=SI_KERNEL, si_addr=0} --- |
386 | */ |
387 | void print_taken_signal(int target_signum, const target_siginfo_t *tinfo); |
388 | extern int do_strace; |
389 | |
390 | /* signal.c */ |
391 | void process_pending_signals(CPUArchState *cpu_env); |
392 | void signal_init(void); |
393 | int queue_signal(CPUArchState *env, int sig, int si_type, |
394 | target_siginfo_t *info); |
395 | void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info); |
396 | void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo); |
397 | int target_to_host_signal(int sig); |
398 | int host_to_target_signal(int sig); |
399 | long do_sigreturn(CPUArchState *env); |
400 | long do_rt_sigreturn(CPUArchState *env); |
401 | abi_long do_sigaltstack(abi_ulong uss_addr, abi_ulong uoss_addr, abi_ulong sp); |
402 | int do_sigprocmask(int how, const sigset_t *set, sigset_t *oldset); |
403 | abi_long do_swapcontext(CPUArchState *env, abi_ulong uold_ctx, |
404 | abi_ulong unew_ctx, abi_long ctx_size); |
405 | /** |
406 | * block_signals: block all signals while handling this guest syscall |
407 | * |
408 | * Block all signals, and arrange that the signal mask is returned to |
409 | * its correct value for the guest before we resume execution of guest code. |
410 | * If this function returns non-zero, then the caller should immediately |
411 | * return -TARGET_ERESTARTSYS to the main loop, which will take the pending |
412 | * signal and restart execution of the syscall. |
413 | * If block_signals() returns zero, then the caller can continue with |
414 | * emulation of the system call knowing that no signals can be taken |
415 | * (and therefore that no race conditions will result). |
416 | * This should only be called once, because if it is called a second time |
417 | * it will always return non-zero. (Think of it like a mutex that can't |
418 | * be recursively locked.) |
419 | * Signals will be unblocked again by process_pending_signals(). |
420 | * |
421 | * Return value: non-zero if there was a pending signal, zero if not. |
422 | */ |
423 | int block_signals(void); /* Returns non zero if signal pending */ |
424 | |
425 | #ifdef TARGET_I386 |
426 | /* vm86.c */ |
427 | void save_v86_state(CPUX86State *env); |
428 | void handle_vm86_trap(CPUX86State *env, int trapno); |
429 | void handle_vm86_fault(CPUX86State *env); |
430 | int do_vm86(CPUX86State *env, long subfunction, abi_ulong v86_addr); |
431 | #elif defined(TARGET_SPARC64) |
432 | void sparc64_set_context(CPUSPARCState *env); |
433 | void sparc64_get_context(CPUSPARCState *env); |
434 | #endif |
435 | |
436 | /* mmap.c */ |
437 | int target_mprotect(abi_ulong start, abi_ulong len, int prot); |
438 | abi_long target_mmap(abi_ulong start, abi_ulong len, int prot, |
439 | int flags, int fd, abi_ulong offset); |
440 | int target_munmap(abi_ulong start, abi_ulong len); |
441 | abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size, |
442 | abi_ulong new_size, unsigned long flags, |
443 | abi_ulong new_addr); |
444 | extern unsigned long last_brk; |
445 | extern abi_ulong mmap_next_start; |
446 | abi_ulong mmap_find_vma(abi_ulong, abi_ulong, abi_ulong); |
447 | void mmap_fork_start(void); |
448 | void mmap_fork_end(int child); |
449 | |
450 | /* main.c */ |
451 | extern unsigned long guest_stack_size; |
452 | |
453 | /* user access */ |
454 | |
455 | #define VERIFY_READ 0 |
456 | #define VERIFY_WRITE 1 /* implies read access */ |
457 | |
458 | static inline int access_ok(int type, abi_ulong addr, abi_ulong size) |
459 | { |
460 | return guest_addr_valid(addr) && |
461 | (size == 0 || guest_addr_valid(addr + size - 1)) && |
462 | page_check_range((target_ulong)addr, size, |
463 | (type == VERIFY_READ) ? PAGE_READ : (PAGE_READ | PAGE_WRITE)) == 0; |
464 | } |
465 | |
466 | /* NOTE __get_user and __put_user use host pointers and don't check access. |
467 | These are usually used to access struct data members once the struct has |
468 | been locked - usually with lock_user_struct. */ |
469 | |
470 | /* |
471 | * Tricky points: |
472 | * - Use __builtin_choose_expr to avoid type promotion from ?:, |
473 | * - Invalid sizes result in a compile time error stemming from |
474 | * the fact that abort has no parameters. |
475 | * - It's easier to use the endian-specific unaligned load/store |
476 | * functions than host-endian unaligned load/store plus tswapN. |
477 | * - The pragmas are necessary only to silence a clang false-positive |
478 | * warning: see https://bugs.llvm.org/show_bug.cgi?id=39113 . |
479 | * - gcc has bugs in its _Pragma() support in some versions, eg |
480 | * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83256 -- so we only |
481 | * include the warning-suppression pragmas for clang |
482 | */ |
483 | #if defined(__clang__) && __has_warning("-Waddress-of-packed-member") |
484 | #define PRAGMA_DISABLE_PACKED_WARNING \ |
485 | _Pragma("GCC diagnostic push"); \ |
486 | _Pragma("GCC diagnostic ignored \"-Waddress-of-packed-member\"") |
487 | |
488 | #define PRAGMA_REENABLE_PACKED_WARNING \ |
489 | _Pragma("GCC diagnostic pop") |
490 | |
491 | #else |
492 | #define PRAGMA_DISABLE_PACKED_WARNING |
493 | #define PRAGMA_REENABLE_PACKED_WARNING |
494 | #endif |
495 | |
496 | #define __put_user_e(x, hptr, e) \ |
497 | do { \ |
498 | PRAGMA_DISABLE_PACKED_WARNING; \ |
499 | (__builtin_choose_expr(sizeof(*(hptr)) == 1, stb_p, \ |
500 | __builtin_choose_expr(sizeof(*(hptr)) == 2, stw_##e##_p, \ |
501 | __builtin_choose_expr(sizeof(*(hptr)) == 4, stl_##e##_p, \ |
502 | __builtin_choose_expr(sizeof(*(hptr)) == 8, stq_##e##_p, abort)))) \ |
503 | ((hptr), (x)), (void)0); \ |
504 | PRAGMA_REENABLE_PACKED_WARNING; \ |
505 | } while (0) |
506 | |
507 | #define __get_user_e(x, hptr, e) \ |
508 | do { \ |
509 | PRAGMA_DISABLE_PACKED_WARNING; \ |
510 | ((x) = (typeof(*hptr))( \ |
511 | __builtin_choose_expr(sizeof(*(hptr)) == 1, ldub_p, \ |
512 | __builtin_choose_expr(sizeof(*(hptr)) == 2, lduw_##e##_p, \ |
513 | __builtin_choose_expr(sizeof(*(hptr)) == 4, ldl_##e##_p, \ |
514 | __builtin_choose_expr(sizeof(*(hptr)) == 8, ldq_##e##_p, abort)))) \ |
515 | (hptr)), (void)0); \ |
516 | PRAGMA_REENABLE_PACKED_WARNING; \ |
517 | } while (0) |
518 | |
519 | |
520 | #ifdef TARGET_WORDS_BIGENDIAN |
521 | # define __put_user(x, hptr) __put_user_e(x, hptr, be) |
522 | # define __get_user(x, hptr) __get_user_e(x, hptr, be) |
523 | #else |
524 | # define __put_user(x, hptr) __put_user_e(x, hptr, le) |
525 | # define __get_user(x, hptr) __get_user_e(x, hptr, le) |
526 | #endif |
527 | |
528 | /* put_user()/get_user() take a guest address and check access */ |
529 | /* These are usually used to access an atomic data type, such as an int, |
530 | * that has been passed by address. These internally perform locking |
531 | * and unlocking on the data type. |
532 | */ |
533 | #define put_user(x, gaddr, target_type) \ |
534 | ({ \ |
535 | abi_ulong __gaddr = (gaddr); \ |
536 | target_type *__hptr; \ |
537 | abi_long __ret = 0; \ |
538 | if ((__hptr = lock_user(VERIFY_WRITE, __gaddr, sizeof(target_type), 0))) { \ |
539 | __put_user((x), __hptr); \ |
540 | unlock_user(__hptr, __gaddr, sizeof(target_type)); \ |
541 | } else \ |
542 | __ret = -TARGET_EFAULT; \ |
543 | __ret; \ |
544 | }) |
545 | |
546 | #define get_user(x, gaddr, target_type) \ |
547 | ({ \ |
548 | abi_ulong __gaddr = (gaddr); \ |
549 | target_type *__hptr; \ |
550 | abi_long __ret = 0; \ |
551 | if ((__hptr = lock_user(VERIFY_READ, __gaddr, sizeof(target_type), 1))) { \ |
552 | __get_user((x), __hptr); \ |
553 | unlock_user(__hptr, __gaddr, 0); \ |
554 | } else { \ |
555 | /* avoid warning */ \ |
556 | (x) = 0; \ |
557 | __ret = -TARGET_EFAULT; \ |
558 | } \ |
559 | __ret; \ |
560 | }) |
561 | |
562 | #define put_user_ual(x, gaddr) put_user((x), (gaddr), abi_ulong) |
563 | #define put_user_sal(x, gaddr) put_user((x), (gaddr), abi_long) |
564 | #define put_user_u64(x, gaddr) put_user((x), (gaddr), uint64_t) |
565 | #define put_user_s64(x, gaddr) put_user((x), (gaddr), int64_t) |
566 | #define put_user_u32(x, gaddr) put_user((x), (gaddr), uint32_t) |
567 | #define put_user_s32(x, gaddr) put_user((x), (gaddr), int32_t) |
568 | #define put_user_u16(x, gaddr) put_user((x), (gaddr), uint16_t) |
569 | #define put_user_s16(x, gaddr) put_user((x), (gaddr), int16_t) |
570 | #define put_user_u8(x, gaddr) put_user((x), (gaddr), uint8_t) |
571 | #define put_user_s8(x, gaddr) put_user((x), (gaddr), int8_t) |
572 | |
573 | #define get_user_ual(x, gaddr) get_user((x), (gaddr), abi_ulong) |
574 | #define get_user_sal(x, gaddr) get_user((x), (gaddr), abi_long) |
575 | #define get_user_u64(x, gaddr) get_user((x), (gaddr), uint64_t) |
576 | #define get_user_s64(x, gaddr) get_user((x), (gaddr), int64_t) |
577 | #define get_user_u32(x, gaddr) get_user((x), (gaddr), uint32_t) |
578 | #define get_user_s32(x, gaddr) get_user((x), (gaddr), int32_t) |
579 | #define get_user_u16(x, gaddr) get_user((x), (gaddr), uint16_t) |
580 | #define get_user_s16(x, gaddr) get_user((x), (gaddr), int16_t) |
581 | #define get_user_u8(x, gaddr) get_user((x), (gaddr), uint8_t) |
582 | #define get_user_s8(x, gaddr) get_user((x), (gaddr), int8_t) |
583 | |
584 | /* copy_from_user() and copy_to_user() are usually used to copy data |
585 | * buffers between the target and host. These internally perform |
586 | * locking/unlocking of the memory. |
587 | */ |
588 | abi_long copy_from_user(void *hptr, abi_ulong gaddr, size_t len); |
589 | abi_long copy_to_user(abi_ulong gaddr, void *hptr, size_t len); |
590 | |
591 | /* Functions for accessing guest memory. The tget and tput functions |
592 | read/write single values, byteswapping as necessary. The lock_user function |
593 | gets a pointer to a contiguous area of guest memory, but does not perform |
594 | any byteswapping. lock_user may return either a pointer to the guest |
595 | memory, or a temporary buffer. */ |
596 | |
597 | /* Lock an area of guest memory into the host. If copy is true then the |
598 | host area will have the same contents as the guest. */ |
599 | static inline void *lock_user(int type, abi_ulong guest_addr, long len, int copy) |
600 | { |
601 | if (!access_ok(type, guest_addr, len)) |
602 | return NULL; |
603 | #ifdef DEBUG_REMAP |
604 | { |
605 | void *addr; |
606 | addr = g_malloc(len); |
607 | if (copy) |
608 | memcpy(addr, g2h(guest_addr), len); |
609 | else |
610 | memset(addr, 0, len); |
611 | return addr; |
612 | } |
613 | #else |
614 | return g2h(guest_addr); |
615 | #endif |
616 | } |
617 | |
618 | /* Unlock an area of guest memory. The first LEN bytes must be |
619 | flushed back to guest memory. host_ptr = NULL is explicitly |
620 | allowed and does nothing. */ |
621 | static inline void unlock_user(void *host_ptr, abi_ulong guest_addr, |
622 | long len) |
623 | { |
624 | |
625 | #ifdef DEBUG_REMAP |
626 | if (!host_ptr) |
627 | return; |
628 | if (host_ptr == g2h(guest_addr)) |
629 | return; |
630 | if (len > 0) |
631 | memcpy(g2h(guest_addr), host_ptr, len); |
632 | g_free(host_ptr); |
633 | #endif |
634 | } |
635 | |
636 | /* Return the length of a string in target memory or -TARGET_EFAULT if |
637 | access error. */ |
638 | abi_long target_strlen(abi_ulong gaddr); |
639 | |
640 | /* Like lock_user but for null terminated strings. */ |
641 | static inline void *lock_user_string(abi_ulong guest_addr) |
642 | { |
643 | abi_long len; |
644 | len = target_strlen(guest_addr); |
645 | if (len < 0) |
646 | return NULL; |
647 | return lock_user(VERIFY_READ, guest_addr, (long)(len + 1), 1); |
648 | } |
649 | |
650 | /* Helper macros for locking/unlocking a target struct. */ |
651 | #define lock_user_struct(type, host_ptr, guest_addr, copy) \ |
652 | (host_ptr = lock_user(type, guest_addr, sizeof(*host_ptr), copy)) |
653 | #define unlock_user_struct(host_ptr, guest_addr, copy) \ |
654 | unlock_user(host_ptr, guest_addr, (copy) ? sizeof(*host_ptr) : 0) |
655 | |
656 | #include <pthread.h> |
657 | |
658 | static inline int is_error(abi_long ret) |
659 | { |
660 | return (abi_ulong)ret >= (abi_ulong)(-4096); |
661 | } |
662 | |
663 | /** |
664 | * preexit_cleanup: housekeeping before the guest exits |
665 | * |
666 | * env: the CPU state |
667 | * code: the exit code |
668 | */ |
669 | void preexit_cleanup(CPUArchState *env, int code); |
670 | |
671 | /* Include target-specific struct and function definitions; |
672 | * they may need access to the target-independent structures |
673 | * above, so include them last. |
674 | */ |
675 | #include "target_cpu.h" |
676 | #include "target_structs.h" |
677 | |
678 | #endif /* QEMU_H */ |
679 | |