bsd-user/qemu.h

   1 /*
   2  *  qemu bsd user mode definition
   3  *
   4  *  This program is free software; you can redistribute it and/or modify
   5  *  it under the terms of the GNU General Public License as published by
   6  *  the Free Software Foundation; either version 2 of the License, or
   7  *  (at your option) any later version.
   8  *
   9  *  This program is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *  GNU General Public License for more details.
  13  *
  14  *  You should have received a copy of the GNU General Public License
  15  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  16  */
  17 #ifndef QEMU_H
  18 #define QEMU_H
  19
  20 #include "qemu/osdep.h"
  21 #include "cpu.h"
  22 #include "qemu/units.h"
  23 #include "exec/cpu_ldst.h"
  24 #include "exec/exec-all.h"
  25
  26 #undef DEBUG_REMAP
  27
  28 #include "exec/user/abitypes.h"
  29
  30 extern char **environ;
  31
  32 enum BSDType {
  33     target_freebsd,
  34     target_netbsd,
  35     target_openbsd,
  36 };
  37 extern enum BSDType bsd_type;
  38
  39 #include "exec/user/thunk.h"
  40 #include "target_arch.h"
  41 #include "syscall_defs.h"
  42 #include "target_syscall.h"
  43 #include "target_os_vmparam.h"
  44 #include "target_os_signal.h"
  45 #include "exec/gdbstub.h"
  46
  47 /*
  48  * This struct is used to hold certain information about the image.  Basically,
  49  * it replicates in user space what would be certain task_struct fields in the
  50  * kernel
  51  */
  52 struct image_info {
  53     abi_ulong load_bias;
  54     abi_ulong load_addr;
  55     abi_ulong start_code;
  56     abi_ulong end_code;
  57     abi_ulong start_data;
  58     abi_ulong end_data;
  59     abi_ulong start_brk;
  60     abi_ulong brk;
  61     abi_ulong start_mmap;
  62     abi_ulong mmap;
  63     abi_ulong rss;
  64     abi_ulong start_stack;
  65     abi_ulong entry;
  66     abi_ulong code_offset;
  67     abi_ulong data_offset;
  68     abi_ulong arg_start;
  69     abi_ulong arg_end;
  70     uint32_t  elf_flags;
  71 };
  72
  73 struct emulated_sigtable {
  74     int pending; /* true if signal is pending */
  75     target_siginfo_t info;
  76 };
  77
  78 /*
  79  * NOTE: we force a big alignment so that the stack stored after is aligned too
  80  */
  81 typedef struct TaskState {
  82     pid_t ts_tid;     /* tid (or pid) of this task */
  83
  84     struct TaskState *next;
  85     struct bsd_binprm *bprm;
  86     struct image_info *info;
  87
  88     struct emulated_sigtable sync_signal;
  89     /*
  90      * TODO: Since we block all signals while returning to the main CPU
  91      * loop, this needn't be an array
  92      */
  93     struct emulated_sigtable sigtab[TARGET_NSIG];
  94     /*
  95      * Nonzero if process_pending_signals() needs to do something (either
  96      * handle a pending signal or unblock signals).
  97      * This flag is written from a signal handler so should be accessed via
  98      * the qatomic_read() and qatomic_set() functions. (It is not accessed
  99      * from multiple threads.)
 100      */
 101     int signal_pending;
 102     /* True if we're leaving a sigsuspend and sigsuspend_mask is valid. */
 103     bool in_sigsuspend;
 104     /*
 105      * This thread's signal mask, as requested by the guest program.
 106      * The actual signal mask of this thread may differ:
 107      *  + we don't let SIGSEGV and SIGBUS be blocked while running guest code
 108      *  + sometimes we block all signals to avoid races
 109      */
 110     sigset_t signal_mask;
 111     /*
 112      * The signal mask imposed by a guest sigsuspend syscall, if we are
 113      * currently in the middle of such a syscall
 114      */
 115     sigset_t sigsuspend_mask;
 116
 117     /* This thread's sigaltstack, if it has one */
 118     struct target_sigaltstack sigaltstack_used;
 119 } __attribute__((aligned(16))) TaskState;
 120
 121 void stop_all_tasks(void);
 122 extern const char *qemu_uname_release;
 123
 124 /*
 125  * TARGET_ARG_MAX defines the number of bytes allocated for arguments
 126  * and envelope for the new program. 256k should suffice for a reasonable
 127  * maxiumum env+arg in 32-bit environments, bump it up to 512k for !ILP32
 128  * platforms.
 129  */
 130 #if TARGET_ABI_BITS > 32
 131 #define TARGET_ARG_MAX (512 * KiB)
 132 #else
 133 #define TARGET_ARG_MAX (256 * KiB)
 134 #endif
 135 #define MAX_ARG_PAGES (TARGET_ARG_MAX / TARGET_PAGE_SIZE)
 136
 137 /*
 138  * This structure is used to hold the arguments that are
 139  * used when loading binaries.
 140  */
 141 struct bsd_binprm {
 142         char buf[128];
 143         void *page[MAX_ARG_PAGES];
 144         abi_ulong p;
 145         abi_ulong stringp;
 146         int fd;
 147         int e_uid, e_gid;
 148         int argc, envc;
 149         char **argv;
 150         char **envp;
 151         char *filename;         /* (Given) Name of binary */
 152         char *fullpath;         /* Full path of binary */
 153         int (*core_dump)(int, CPUArchState *);
 154 };
 155
 156 void do_init_thread(struct target_pt_regs *regs, struct image_info *infop);
 157 abi_ulong loader_build_argptr(int envc, int argc, abi_ulong sp,
 158                               abi_ulong stringp);
 159 int loader_exec(const char *filename, char **argv, char **envp,
 160                 struct target_pt_regs *regs, struct image_info *infop,
 161                 struct bsd_binprm *bprm);
 162
 163 int load_elf_binary(struct bsd_binprm *bprm, struct target_pt_regs *regs,
 164                     struct image_info *info);
 165 int load_flt_binary(struct bsd_binprm *bprm, struct target_pt_regs *regs,
 166                     struct image_info *info);
 167 int is_target_elf_binary(int fd);
 168
 169 abi_long memcpy_to_target(abi_ulong dest, const void *src,
 170                           unsigned long len);
 171 void target_set_brk(abi_ulong new_brk);
 172 abi_long do_brk(abi_ulong new_brk);
 173 void syscall_init(void);
 174 abi_long do_freebsd_syscall(void *cpu_env, int num, abi_long arg1,
 175                             abi_long arg2, abi_long arg3, abi_long arg4,
 176                             abi_long arg5, abi_long arg6, abi_long arg7,
 177                             abi_long arg8);
 178 abi_long do_netbsd_syscall(void *cpu_env, int num, abi_long arg1,
 179                            abi_long arg2, abi_long arg3, abi_long arg4,
 180                            abi_long arg5, abi_long arg6);
 181 abi_long do_openbsd_syscall(void *cpu_env, int num, abi_long arg1,
 182                             abi_long arg2, abi_long arg3, abi_long arg4,
 183                             abi_long arg5, abi_long arg6);
 184 void gemu_log(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
 185 extern __thread CPUState *thread_cpu;
 186 void cpu_loop(CPUArchState *env);
 187 char *target_strerror(int err);
 188 int get_osversion(void);
 189 void fork_start(void);
 190 void fork_end(int child);
 191
 192 #include "qemu/log.h"
 193
 194 /* strace.c */
 195 struct syscallname {
 196     int nr;
 197     const char *name;
 198     const char *format;
 199     void (*call)(const struct syscallname *,
 200                  abi_long, abi_long, abi_long,
 201                  abi_long, abi_long, abi_long);
 202     void (*result)(const struct syscallname *, abi_long);
 203 };
 204
 205 void
 206 print_freebsd_syscall(int num,
 207                       abi_long arg1, abi_long arg2, abi_long arg3,
 208                       abi_long arg4, abi_long arg5, abi_long arg6);
 209 void print_freebsd_syscall_ret(int num, abi_long ret);
 210 void
 211 print_netbsd_syscall(int num,
 212                      abi_long arg1, abi_long arg2, abi_long arg3,
 213                      abi_long arg4, abi_long arg5, abi_long arg6);
 214 void print_netbsd_syscall_ret(int num, abi_long ret);
 215 void
 216 print_openbsd_syscall(int num,
 217                       abi_long arg1, abi_long arg2, abi_long arg3,
 218                       abi_long arg4, abi_long arg5, abi_long arg6);
 219 void print_openbsd_syscall_ret(int num, abi_long ret);
 220 /**
 221  * print_taken_signal:
 222  * @target_signum: target signal being taken
 223  * @tinfo: target_siginfo_t which will be passed to the guest for the signal
 224  *
 225  * Print strace output indicating that this signal is being taken by the guest,
 226  * in a format similar to:
 227  * --- SIGSEGV {si_signo=SIGSEGV, si_code=SI_KERNEL, si_addr=0} ---
 228  */
 229 void print_taken_signal(int target_signum, const target_siginfo_t *tinfo);
 230 extern int do_strace;
 231
 232 /* mmap.c */
 233 int target_mprotect(abi_ulong start, abi_ulong len, int prot);
 234 abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
 235                      int flags, int fd, off_t offset);
 236 int target_munmap(abi_ulong start, abi_ulong len);
 237 abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,
 238                        abi_ulong new_size, unsigned long flags,
 239                        abi_ulong new_addr);
 240 int target_msync(abi_ulong start, abi_ulong len, int flags);
 241 extern unsigned long last_brk;
 242 extern abi_ulong mmap_next_start;
 243 abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size);
 244 void mmap_fork_start(void);
 245 void mmap_fork_end(int child);
 246
 247 /* main.c */
 248 extern char qemu_proc_pathname[];
 249 extern unsigned long target_maxtsiz;
 250 extern unsigned long target_dfldsiz;
 251 extern unsigned long target_maxdsiz;
 252 extern unsigned long target_dflssiz;
 253 extern unsigned long target_maxssiz;
 254 extern unsigned long target_sgrowsiz;
 255
 256 /* syscall.c */
 257 abi_long get_errno(abi_long ret);
 258 bool is_error(abi_long ret);
 259
 260 /* os-sys.c */
 261 abi_long do_freebsd_sysarch(void *cpu_env, abi_long arg1, abi_long arg2);
 262
 263 /* user access */
 264
 265 #define VERIFY_READ  PAGE_READ
 266 #define VERIFY_WRITE (PAGE_READ | PAGE_WRITE)
 267
 268 static inline bool access_ok(int type, abi_ulong addr, abi_ulong size)
 269 {
 270     return page_check_range((target_ulong)addr, size, type) == 0;
 271 }
 272
 273 /*
 274  * NOTE __get_user and __put_user use host pointers and don't check access.
 275  *
 276  * These are usually used to access struct data members once the struct has been
 277  * locked - usually with lock_user_struct().
 278  */
 279 #define __put_user(x, hptr)\
 280 ({\
 281     int size = sizeof(*hptr);\
 282     switch (size) {\
 283     case 1:\
 284         *(uint8_t *)(hptr) = (uint8_t)(typeof(*hptr))(x);\
 285         break;\
 286     case 2:\
 287         *(uint16_t *)(hptr) = tswap16((typeof(*hptr))(x));\
 288         break;\
 289     case 4:\
 290         *(uint32_t *)(hptr) = tswap32((typeof(*hptr))(x));\
 291         break;\
 292     case 8:\
 293         *(uint64_t *)(hptr) = tswap64((typeof(*hptr))(x));\
 294         break;\
 295     default:\
 296         abort();\
 297     } \
 298     0;\
 299 })
 300
 301 #define __get_user(x, hptr) \
 302 ({\
 303     int size = sizeof(*hptr);\
 304     switch (size) {\
 305     case 1:\
 306         x = (typeof(*hptr))*(uint8_t *)(hptr);\
 307         break;\
 308     case 2:\
 309         x = (typeof(*hptr))tswap16(*(uint16_t *)(hptr));\
 310         break;\
 311     case 4:\
 312         x = (typeof(*hptr))tswap32(*(uint32_t *)(hptr));\
 313         break;\
 314     case 8:\
 315         x = (typeof(*hptr))tswap64(*(uint64_t *)(hptr));\
 316         break;\
 317     default:\
 318         x = 0;\
 319         abort();\
 320     } \
 321     0;\
 322 })
 323
 324 /*
 325  * put_user()/get_user() take a guest address and check access
 326  *
 327  * These are usually used to access an atomic data type, such as an int, that
 328  * has been passed by address.  These internally perform locking and unlocking
 329  * on the data type.
 330  */
 331 #define put_user(x, gaddr, target_type)                                 \
 332 ({                                                                      \
 333     abi_ulong __gaddr = (gaddr);                                        \
 334     target_type *__hptr;                                                \
 335     abi_long __ret;                                                     \
 336     __hptr = lock_user(VERIFY_WRITE, __gaddr, sizeof(target_type), 0);  \
 337     if (__hptr) {                                                       \
 338         __ret = __put_user((x), __hptr);                                \
 339         unlock_user(__hptr, __gaddr, sizeof(target_type));              \
 340     } else                                                              \
 341         __ret = -TARGET_EFAULT;                                         \
 342     __ret;                                                              \
 343 })
 344
 345 #define get_user(x, gaddr, target_type)                                 \
 346 ({                                                                      \
 347     abi_ulong __gaddr = (gaddr);                                        \
 348     target_type *__hptr;                                                \
 349     abi_long __ret;                                                     \
 350     __hptr = lock_user(VERIFY_READ, __gaddr, sizeof(target_type), 1);   \
 351     if (__hptr) {                                                       \
 352         __ret = __get_user((x), __hptr);                                \
 353         unlock_user(__hptr, __gaddr, 0);                                \
 354     } else {                                                            \
 355         (x) = 0;                                                        \
 356         __ret = -TARGET_EFAULT;                                         \
 357     }                                                                   \
 358     __ret;                                                              \
 359 })
 360
 361 #define put_user_ual(x, gaddr) put_user((x), (gaddr), abi_ulong)
 362 #define put_user_sal(x, gaddr) put_user((x), (gaddr), abi_long)
 363 #define put_user_u64(x, gaddr) put_user((x), (gaddr), uint64_t)
 364 #define put_user_s64(x, gaddr) put_user((x), (gaddr), int64_t)
 365 #define put_user_u32(x, gaddr) put_user((x), (gaddr), uint32_t)
 366 #define put_user_s32(x, gaddr) put_user((x), (gaddr), int32_t)
 367 #define put_user_u16(x, gaddr) put_user((x), (gaddr), uint16_t)
 368 #define put_user_s16(x, gaddr) put_user((x), (gaddr), int16_t)
 369 #define put_user_u8(x, gaddr)  put_user((x), (gaddr), uint8_t)
 370 #define put_user_s8(x, gaddr)  put_user((x), (gaddr), int8_t)
 371
 372 #define get_user_ual(x, gaddr) get_user((x), (gaddr), abi_ulong)
 373 #define get_user_sal(x, gaddr) get_user((x), (gaddr), abi_long)
 374 #define get_user_u64(x, gaddr) get_user((x), (gaddr), uint64_t)
 375 #define get_user_s64(x, gaddr) get_user((x), (gaddr), int64_t)
 376 #define get_user_u32(x, gaddr) get_user((x), (gaddr), uint32_t)
 377 #define get_user_s32(x, gaddr) get_user((x), (gaddr), int32_t)
 378 #define get_user_u16(x, gaddr) get_user((x), (gaddr), uint16_t)
 379 #define get_user_s16(x, gaddr) get_user((x), (gaddr), int16_t)
 380 #define get_user_u8(x, gaddr)  get_user((x), (gaddr), uint8_t)
 381 #define get_user_s8(x, gaddr)  get_user((x), (gaddr), int8_t)
 382
 383 /*
 384  * copy_from_user() and copy_to_user() are usually used to copy data
 385  * buffers between the target and host.  These internally perform
 386  * locking/unlocking of the memory.
 387  */
 388 abi_long copy_from_user(void *hptr, abi_ulong gaddr, size_t len);
 389 abi_long copy_to_user(abi_ulong gaddr, void *hptr, size_t len);
 390
 391 /*
 392  * Functions for accessing guest memory.  The tget and tput functions
 393  * read/write single values, byteswapping as necessary.  The lock_user function
 394  * gets a pointer to a contiguous area of guest memory, but does not perform
 395  * any byteswapping.  lock_user may return either a pointer to the guest
 396  * memory, or a temporary buffer.
 397  */
 398
 399 /*
 400  * Lock an area of guest memory into the host.  If copy is true then the
 401  * host area will have the same contents as the guest.
 402  */
 403 static inline void *lock_user(int type, abi_ulong guest_addr, long len,
 404                               int copy)
 405 {
 406     if (!access_ok(type, guest_addr, len)) {
 407         return NULL;
 408     }
 409 #ifdef DEBUG_REMAP
 410     {
 411         void *addr;
 412         addr = g_malloc(len);
 413         if (copy) {
 414             memcpy(addr, g2h_untagged(guest_addr), len);
 415         } else {
 416             memset(addr, 0, len);
 417         }
 418         return addr;
 419     }
 420 #else
 421     return g2h_untagged(guest_addr);
 422 #endif
 423 }
 424
 425 /*
 426  * Unlock an area of guest memory.  The first LEN bytes must be flushed back to
 427  * guest memory. host_ptr = NULL is explicitly allowed and does nothing.
 428  */
 429 static inline void unlock_user(void *host_ptr, abi_ulong guest_addr,
 430                                long len)
 431 {
 432
 433 #ifdef DEBUG_REMAP
 434     if (!host_ptr) {
 435         return;
 436     }
 437     if (host_ptr == g2h_untagged(guest_addr)) {
 438         return;
 439     }
 440     if (len > 0) {
 441         memcpy(g2h_untagged(guest_addr), host_ptr, len);
 442     }
 443     g_free(host_ptr);
 444 #endif
 445 }
 446
 447 /*
 448  * Return the length of a string in target memory or -TARGET_EFAULT if access
 449  * error.
 450  */
 451 abi_long target_strlen(abi_ulong gaddr);
 452
 453 /* Like lock_user but for null terminated strings.  */
 454 static inline void *lock_user_string(abi_ulong guest_addr)
 455 {
 456     abi_long len;
 457     len = target_strlen(guest_addr);
 458     if (len < 0) {
 459         return NULL;
 460     }
 461     return lock_user(VERIFY_READ, guest_addr, (long)(len + 1), 1);
 462 }
 463
 464 /* Helper macros for locking/unlocking a target struct.  */
 465 #define lock_user_struct(type, host_ptr, guest_addr, copy)      \
 466     (host_ptr = lock_user(type, guest_addr, sizeof(*host_ptr), copy))
 467 #define unlock_user_struct(host_ptr, guest_addr, copy)          \
 468     unlock_user(host_ptr, guest_addr, (copy) ? sizeof(*host_ptr) : 0)
 469
 470 #include <pthread.h>
 471
 472 #include "user/safe-syscall.h"
 473
 474 #endif /* QEMU_H */