linux-user/qemu.h

   1 #ifndef QEMU_H
   2 #define QEMU_H
   3
   4
   5 #include "cpu.h"
   6 #include "exec/cpu_ldst.h"
   7
   8 #undef DEBUG_REMAP
   9 #ifdef DEBUG_REMAP
  10 #endif /* DEBUG_REMAP */
  11
  12 #include "exec/user/abitypes.h"
  13
  14 #include "exec/user/thunk.h"
  15 #include "syscall_defs.h"
  16 #include "target_syscall.h"
  17 #include "exec/gdbstub.h"
  18 #include "qemu/queue.h"
  19
  20 #define THREAD __thread
  21
  22 /* This struct is used to hold certain information about the image.
  23  * Basically, it replicates in user space what would be certain
  24  * task_struct fields in the kernel
  25  */
  26 struct image_info {
  27         abi_ulong       load_bias;
  28         abi_ulong       load_addr;
  29         abi_ulong       start_code;
  30         abi_ulong       end_code;
  31         abi_ulong       start_data;
  32         abi_ulong       end_data;
  33         abi_ulong       start_brk;
  34         abi_ulong       brk;
  35         abi_ulong       start_mmap;
  36         abi_ulong       start_stack;
  37         abi_ulong       stack_limit;
  38         abi_ulong       entry;
  39         abi_ulong       code_offset;
  40         abi_ulong       data_offset;
  41         abi_ulong       saved_auxv;
  42         abi_ulong       auxv_len;
  43         abi_ulong       arg_start;
  44         abi_ulong       arg_end;
  45         uint32_t        elf_flags;
  46         int             personality;
  47 #ifdef CONFIG_USE_FDPIC
  48         abi_ulong       loadmap_addr;
  49         uint16_t        nsegs;
  50         void           *loadsegs;
  51         abi_ulong       pt_dynamic_addr;
  52         struct image_info *other_info;
  53 #endif
  54 };
  55
  56 #ifdef TARGET_I386
  57 /* Information about the current linux thread */
  58 struct vm86_saved_state {
  59     uint32_t eax; /* return code */
  60     uint32_t ebx;
  61     uint32_t ecx;
  62     uint32_t edx;
  63     uint32_t esi;
  64     uint32_t edi;
  65     uint32_t ebp;
  66     uint32_t esp;
  67     uint32_t eflags;
  68     uint32_t eip;
  69     uint16_t cs, ss, ds, es, fs, gs;
  70 };
  71 #endif
  72
  73 #if defined(TARGET_ARM) && defined(TARGET_ABI32)
  74 /* FPU emulator */
  75 #include "nwfpe/fpa11.h"
  76 #endif
  77
  78 #define MAX_SIGQUEUE_SIZE 1024
  79
  80 struct sigqueue {
  81     struct sigqueue *next;
  82     target_siginfo_t info;
  83 };
  84
  85 struct emulated_sigtable {
  86     int pending; /* true if signal is pending */
  87     struct sigqueue *first;
  88     struct sigqueue info; /* in order to always have memory for the
  89                              first signal, we put it here */
  90 };
  91
  92 /* NOTE: we force a big alignment so that the stack stored after is
  93    aligned too */
  94 typedef struct TaskState {
  95     pid_t ts_tid;     /* tid (or pid) of this task */
  96 #ifdef TARGET_ARM
  97 # ifdef TARGET_ABI32
  98     /* FPA state */
  99     FPA11 fpa;
 100 # endif
 101     int swi_errno;
 102 #endif
 103 #ifdef TARGET_UNICORE32
 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) || defined(TARGET_UNICORE32)
 119     /* Extra fields for semihosted binaries.  */
 120     uint32_t heap_base;
 121     uint32_t heap_limit;
 122 #endif
 123     uint32_t stack_base;
 124     int used; /* non zero if used */
 125     bool sigsegv_blocked; /* SIGSEGV blocked by guest */
 126     struct image_info *info;
 127     struct linux_binprm *bprm;
 128
 129     struct emulated_sigtable sigtab[TARGET_NSIG];
 130     struct sigqueue sigqueue_table[MAX_SIGQUEUE_SIZE]; /* siginfo queue */
 131     struct sigqueue *first_free; /* first free siginfo queue entry */
 132     int signal_pending; /* non zero if a signal may be pending */
 133 } __attribute__((aligned(16))) TaskState;
 134
 135 extern char *exec_path;
 136 void init_task_state(TaskState *ts);
 137 void task_settid(TaskState *);
 138 void stop_all_tasks(void);
 139 extern const char *qemu_uname_release;
 140 extern unsigned long mmap_min_addr;
 141
 142 /* ??? See if we can avoid exposing so much of the loader internals.  */
 143
 144 /* Read a good amount of data initially, to hopefully get all the
 145    program headers loaded.  */
 146 #define BPRM_BUF_SIZE  1024
 147
 148 /*
 149  * This structure is used to hold the arguments that are
 150  * used when loading binaries.
 151  */
 152 struct linux_binprm {
 153         char buf[BPRM_BUF_SIZE] __attribute__((aligned));
 154         abi_ulong p;
 155         int fd;
 156         int e_uid, e_gid;
 157         int argc, envc;
 158         char **argv;
 159         char **envp;
 160         char * filename;        /* Name of binary */
 161         int (*core_dump)(int, const CPUArchState *); /* coredump routine */
 162 };
 163
 164 void do_init_thread(struct target_pt_regs *regs, struct image_info *infop);
 165 abi_ulong loader_build_argptr(int envc, int argc, abi_ulong sp,
 166                               abi_ulong stringp, int push_ptr);
 167 int loader_exec(int fdexec, const char *filename, char **argv, char **envp,
 168              struct target_pt_regs * regs, struct image_info *infop,
 169              struct linux_binprm *);
 170
 171 int load_elf_binary(struct linux_binprm *bprm, struct image_info *info);
 172 int load_flt_binary(struct linux_binprm *bprm, struct image_info *info);
 173
 174 abi_long memcpy_to_target(abi_ulong dest, const void *src,
 175                           unsigned long len);
 176 void target_set_brk(abi_ulong new_brk);
 177 abi_long do_brk(abi_ulong new_brk);
 178 void syscall_init(void);
 179 abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
 180                     abi_long arg2, abi_long arg3, abi_long arg4,
 181                     abi_long arg5, abi_long arg6, abi_long arg7,
 182                     abi_long arg8);
 183 void gemu_log(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
 184 extern THREAD CPUState *thread_cpu;
 185 void cpu_loop(CPUArchState *env);
 186 char *target_strerror(int err);
 187 int get_osversion(void);
 188 void init_qemu_uname_release(void);
 189 void fork_start(void);
 190 void fork_end(int child);
 191
 192 /* Creates the initial guest address space in the host memory space using
 193  * the given host start address hint and size.  The guest_start parameter
 194  * specifies the start address of the guest space.  guest_base will be the
 195  * difference between the host start address computed by this function and
 196  * guest_start.  If fixed is specified, then the mapped address space must
 197  * start at host_start.  The real start address of the mapped memory space is
 198  * returned or -1 if there was an error.
 199  */
 200 unsigned long init_guest_space(unsigned long host_start,
 201                                unsigned long host_size,
 202                                unsigned long guest_start,
 203                                bool fixed);
 204
 205 #include "qemu/log.h"
 206
 207 /* syscall.c */
 208 int host_to_target_waitstatus(int status);
 209
 210 /* strace.c */
 211 void print_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_syscall_ret(int num, abi_long arg1);
 215 extern int do_strace;
 216
 217 /* signal.c */
 218 void process_pending_signals(CPUArchState *cpu_env);
 219 void signal_init(void);
 220 int queue_signal(CPUArchState *env, int sig, target_siginfo_t *info);
 221 void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info);
 222 void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo);
 223 int target_to_host_signal(int sig);
 224 int host_to_target_signal(int sig);
 225 long do_sigreturn(CPUArchState *env);
 226 long do_rt_sigreturn(CPUArchState *env);
 227 abi_long do_sigaltstack(abi_ulong uss_addr, abi_ulong uoss_addr, abi_ulong sp);
 228 int do_sigprocmask(int how, const sigset_t *set, sigset_t *oldset);
 229
 230 #ifdef TARGET_I386
 231 /* vm86.c */
 232 void save_v86_state(CPUX86State *env);
 233 void handle_vm86_trap(CPUX86State *env, int trapno);
 234 void handle_vm86_fault(CPUX86State *env);
 235 int do_vm86(CPUX86State *env, long subfunction, abi_ulong v86_addr);
 236 #elif defined(TARGET_SPARC64)
 237 void sparc64_set_context(CPUSPARCState *env);
 238 void sparc64_get_context(CPUSPARCState *env);
 239 #endif
 240
 241 /* mmap.c */
 242 int target_mprotect(abi_ulong start, abi_ulong len, int prot);
 243 abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
 244                      int flags, int fd, abi_ulong offset);
 245 int target_munmap(abi_ulong start, abi_ulong len);
 246 abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,
 247                        abi_ulong new_size, unsigned long flags,
 248                        abi_ulong new_addr);
 249 int target_msync(abi_ulong start, abi_ulong len, int flags);
 250 extern unsigned long last_brk;
 251 extern abi_ulong mmap_next_start;
 252 abi_ulong mmap_find_vma(abi_ulong, abi_ulong);
 253 void cpu_list_lock(void);
 254 void cpu_list_unlock(void);
 255 void mmap_fork_start(void);
 256 void mmap_fork_end(int child);
 257
 258 /* main.c */
 259 extern unsigned long guest_stack_size;
 260
 261 /* user access */
 262
 263 #define VERIFY_READ 0
 264 #define VERIFY_WRITE 1 /* implies read access */
 265
 266 static inline int access_ok(int type, abi_ulong addr, abi_ulong size)
 267 {
 268     return page_check_range((target_ulong)addr, size,
 269                             (type == VERIFY_READ) ? PAGE_READ : (PAGE_READ | PAGE_WRITE)) == 0;
 270 }
 271
 272 /* NOTE __get_user and __put_user use host pointers and don't check access.
 273    These are usually used to access struct data members once the struct has
 274    been locked - usually with lock_user_struct.  */
 275
 276 /* Tricky points:
 277    - Use __builtin_choose_expr to avoid type promotion from ?:,
 278    - Invalid sizes result in a compile time error stemming from
 279      the fact that abort has no parameters.
 280    - It's easier to use the endian-specific unaligned load/store
 281      functions than host-endian unaligned load/store plus tswapN.  */
 282
 283 #define __put_user_e(x, hptr, e)                                        \
 284   (__builtin_choose_expr(sizeof(*(hptr)) == 1, stb_p,                   \
 285    __builtin_choose_expr(sizeof(*(hptr)) == 2, stw_##e##_p,             \
 286    __builtin_choose_expr(sizeof(*(hptr)) == 4, stl_##e##_p,             \
 287    __builtin_choose_expr(sizeof(*(hptr)) == 8, stq_##e##_p, abort))))   \
 288      ((hptr), (x)), (void)0)
 289
 290 #define __get_user_e(x, hptr, e)                                        \
 291   ((x) = (typeof(*hptr))(                                               \
 292    __builtin_choose_expr(sizeof(*(hptr)) == 1, ldub_p,                  \
 293    __builtin_choose_expr(sizeof(*(hptr)) == 2, lduw_##e##_p,            \
 294    __builtin_choose_expr(sizeof(*(hptr)) == 4, ldl_##e##_p,             \
 295    __builtin_choose_expr(sizeof(*(hptr)) == 8, ldq_##e##_p, abort))))   \
 296      (hptr)), (void)0)
 297
 298 #ifdef TARGET_WORDS_BIGENDIAN
 299 # define __put_user(x, hptr)  __put_user_e(x, hptr, be)
 300 # define __get_user(x, hptr)  __get_user_e(x, hptr, be)
 301 #else
 302 # define __put_user(x, hptr)  __put_user_e(x, hptr, le)
 303 # define __get_user(x, hptr)  __get_user_e(x, hptr, le)
 304 #endif
 305
 306 /* put_user()/get_user() take a guest address and check access */
 307 /* These are usually used to access an atomic data type, such as an int,
 308  * that has been passed by address.  These internally perform locking
 309  * and unlocking on the data type.
 310  */
 311 #define put_user(x, gaddr, target_type)                                 \
 312 ({                                                                      \
 313     abi_ulong __gaddr = (gaddr);                                        \
 314     target_type *__hptr;                                                \
 315     abi_long __ret = 0;                                                 \
 316     if ((__hptr = lock_user(VERIFY_WRITE, __gaddr, sizeof(target_type), 0))) { \
 317         __put_user((x), __hptr);                                \
 318         unlock_user(__hptr, __gaddr, sizeof(target_type));              \
 319     } else                                                              \
 320         __ret = -TARGET_EFAULT;                                         \
 321     __ret;                                                              \
 322 })
 323
 324 #define get_user(x, gaddr, target_type)                                 \
 325 ({                                                                      \
 326     abi_ulong __gaddr = (gaddr);                                        \
 327     target_type *__hptr;                                                \
 328     abi_long __ret = 0;                                                 \
 329     if ((__hptr = lock_user(VERIFY_READ, __gaddr, sizeof(target_type), 1))) { \
 330         __get_user((x), __hptr);                                \
 331         unlock_user(__hptr, __gaddr, 0);                                \
 332     } else {                                                            \
 333         /* avoid warning */                                             \
 334         (x) = 0;                                                        \
 335         __ret = -TARGET_EFAULT;                                         \
 336     }                                                                   \
 337     __ret;                                                              \
 338 })
 339
 340 #define put_user_ual(x, gaddr) put_user((x), (gaddr), abi_ulong)
 341 #define put_user_sal(x, gaddr) put_user((x), (gaddr), abi_long)
 342 #define put_user_u64(x, gaddr) put_user((x), (gaddr), uint64_t)
 343 #define put_user_s64(x, gaddr) put_user((x), (gaddr), int64_t)
 344 #define put_user_u32(x, gaddr) put_user((x), (gaddr), uint32_t)
 345 #define put_user_s32(x, gaddr) put_user((x), (gaddr), int32_t)
 346 #define put_user_u16(x, gaddr) put_user((x), (gaddr), uint16_t)
 347 #define put_user_s16(x, gaddr) put_user((x), (gaddr), int16_t)
 348 #define put_user_u8(x, gaddr)  put_user((x), (gaddr), uint8_t)
 349 #define put_user_s8(x, gaddr)  put_user((x), (gaddr), int8_t)
 350
 351 #define get_user_ual(x, gaddr) get_user((x), (gaddr), abi_ulong)
 352 #define get_user_sal(x, gaddr) get_user((x), (gaddr), abi_long)
 353 #define get_user_u64(x, gaddr) get_user((x), (gaddr), uint64_t)
 354 #define get_user_s64(x, gaddr) get_user((x), (gaddr), int64_t)
 355 #define get_user_u32(x, gaddr) get_user((x), (gaddr), uint32_t)
 356 #define get_user_s32(x, gaddr) get_user((x), (gaddr), int32_t)
 357 #define get_user_u16(x, gaddr) get_user((x), (gaddr), uint16_t)
 358 #define get_user_s16(x, gaddr) get_user((x), (gaddr), int16_t)
 359 #define get_user_u8(x, gaddr)  get_user((x), (gaddr), uint8_t)
 360 #define get_user_s8(x, gaddr)  get_user((x), (gaddr), int8_t)
 361
 362 /* copy_from_user() and copy_to_user() are usually used to copy data
 363  * buffers between the target and host.  These internally perform
 364  * locking/unlocking of the memory.
 365  */
 366 abi_long copy_from_user(void *hptr, abi_ulong gaddr, size_t len);
 367 abi_long copy_to_user(abi_ulong gaddr, void *hptr, size_t len);
 368
 369 /* Functions for accessing guest memory.  The tget and tput functions
 370    read/write single values, byteswapping as necessary.  The lock_user function
 371    gets a pointer to a contiguous area of guest memory, but does not perform
 372    any byteswapping.  lock_user may return either a pointer to the guest
 373    memory, or a temporary buffer.  */
 374
 375 /* Lock an area of guest memory into the host.  If copy is true then the
 376    host area will have the same contents as the guest.  */
 377 static inline void *lock_user(int type, abi_ulong guest_addr, long len, int copy)
 378 {
 379     if (!access_ok(type, guest_addr, len))
 380         return NULL;
 381 #ifdef DEBUG_REMAP
 382     {
 383         void *addr;
 384         addr = malloc(len);
 385         if (copy)
 386             memcpy(addr, g2h(guest_addr), len);
 387         else
 388             memset(addr, 0, len);
 389         return addr;
 390     }
 391 #else
 392     return g2h(guest_addr);
 393 #endif
 394 }
 395
 396 /* Unlock an area of guest memory.  The first LEN bytes must be
 397    flushed back to guest memory. host_ptr = NULL is explicitly
 398    allowed and does nothing. */
 399 static inline void unlock_user(void *host_ptr, abi_ulong guest_addr,
 400                                long len)
 401 {
 402
 403 #ifdef DEBUG_REMAP
 404     if (!host_ptr)
 405         return;
 406     if (host_ptr == g2h(guest_addr))
 407         return;
 408     if (len > 0)
 409         memcpy(g2h(guest_addr), host_ptr, len);
 410     free(host_ptr);
 411 #endif
 412 }
 413
 414 /* Return the length of a string in target memory or -TARGET_EFAULT if
 415    access error. */
 416 abi_long target_strlen(abi_ulong gaddr);
 417
 418 /* Like lock_user but for null terminated strings.  */
 419 static inline void *lock_user_string(abi_ulong guest_addr)
 420 {
 421     abi_long len;
 422     len = target_strlen(guest_addr);
 423     if (len < 0)
 424         return NULL;
 425     return lock_user(VERIFY_READ, guest_addr, (long)(len + 1), 1);
 426 }
 427
 428 /* Helper macros for locking/unlocking a target struct.  */
 429 #define lock_user_struct(type, host_ptr, guest_addr, copy)      \
 430     (host_ptr = lock_user(type, guest_addr, sizeof(*host_ptr), copy))
 431 #define unlock_user_struct(host_ptr, guest_addr, copy)          \
 432     unlock_user(host_ptr, guest_addr, (copy) ? sizeof(*host_ptr) : 0)
 433
 434 #include <pthread.h>
 435
 436 /* Include target-specific struct and function definitions;
 437  * they may need access to the target-independent structures
 438  * above, so include them last.
 439  */
 440 #include "target_cpu.h"
 441 #include "target_signal.h"
 442 #include "target_structs.h"
 443
 444 #endif /* QEMU_H */