linux-user/qemu.h

   1 #ifndef QEMU_H
   2 #define QEMU_H
   3
   4 #include <signal.h>
   5 #include <string.h>
   6
   7 #include "cpu.h"
   8
   9 #undef DEBUG_REMAP
  10 #ifdef DEBUG_REMAP
  11 #include <stdlib.h>
  12 #endif /* DEBUG_REMAP */
  13
  14 #include "exec/user/abitypes.h"
  15
  16 #include "exec/user/thunk.h"
  17 #include "syscall_defs.h"
  18 #include "syscall.h"
  19 #include "exec/gdbstub.h"
  20 #include "qemu/queue.h"
  21
  22 #define THREAD __thread
  23
  24 /* This struct is used to hold certain information about the image.
  25  * Basically, it replicates in user space what would be certain
  26  * task_struct fields in the kernel
  27  */
  28 struct image_info {
  29         abi_ulong       load_bias;
  30         abi_ulong       load_addr;
  31         abi_ulong       start_code;
  32         abi_ulong       end_code;
  33         abi_ulong       start_data;
  34         abi_ulong       end_data;
  35         abi_ulong       start_brk;
  36         abi_ulong       brk;
  37         abi_ulong       start_mmap;
  38         abi_ulong       mmap;
  39         abi_ulong       rss;
  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         uint32_t        elf_flags;
  50         int             personality;
  51 #ifdef CONFIG_USE_FDPIC
  52         abi_ulong       loadmap_addr;
  53         uint16_t        nsegs;
  54         void           *loadsegs;
  55         abi_ulong       pt_dynamic_addr;
  56         struct image_info *other_info;
  57 #endif
  58 };
  59
  60 #ifdef TARGET_I386
  61 /* Information about the current linux thread */
  62 struct vm86_saved_state {
  63     uint32_t eax; /* return code */
  64     uint32_t ebx;
  65     uint32_t ecx;
  66     uint32_t edx;
  67     uint32_t esi;
  68     uint32_t edi;
  69     uint32_t ebp;
  70     uint32_t esp;
  71     uint32_t eflags;
  72     uint32_t eip;
  73     uint16_t cs, ss, ds, es, fs, gs;
  74 };
  75 #endif
  76
  77 #if defined(TARGET_ARM) && defined(TARGET_ABI32)
  78 /* FPU emulator */
  79 #include "nwfpe/fpa11.h"
  80 #endif
  81
  82 #define MAX_SIGQUEUE_SIZE 1024
  83
  84 struct sigqueue {
  85     struct sigqueue *next;
  86     target_siginfo_t info;
  87 };
  88
  89 struct emulated_sigtable {
  90     int pending; /* true if signal is pending */
  91     struct sigqueue *first;
  92     struct sigqueue info; /* in order to always have memory for the
  93                              first signal, we put it here */
  94 };
  95
  96 /* NOTE: we force a big alignment so that the stack stored after is
  97    aligned too */
  98 typedef struct TaskState {
  99     pid_t ts_tid;     /* tid (or pid) of this task */
 100 #ifdef TARGET_ARM
 101 # ifdef TARGET_ABI32
 102     /* FPA state */
 103     FPA11 fpa;
 104 # endif
 105     int swi_errno;
 106 #endif
 107 #ifdef TARGET_UNICORE32
 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     int sim_syscalls;
 120     abi_ulong tp_value;
 121 #endif
 122 #if defined(TARGET_ARM) || defined(TARGET_M68K) || defined(TARGET_UNICORE32)
 123     /* Extra fields for semihosted binaries.  */
 124     uint32_t heap_base;
 125     uint32_t heap_limit;
 126 #endif
 127     uint32_t stack_base;
 128     int used; /* non zero if used */
 129     bool sigsegv_blocked; /* SIGSEGV blocked by guest */
 130     struct image_info *info;
 131     struct linux_binprm *bprm;
 132
 133     struct emulated_sigtable sigtab[TARGET_NSIG];
 134     struct sigqueue sigqueue_table[MAX_SIGQUEUE_SIZE]; /* siginfo queue */
 135     struct sigqueue *first_free; /* first free siginfo queue entry */
 136     int signal_pending; /* non zero if a signal may be pending */
 137 } __attribute__((aligned(16))) TaskState;
 138
 139 extern char *exec_path;
 140 void init_task_state(TaskState *ts);
 141 void task_settid(TaskState *);
 142 void stop_all_tasks(void);
 143 extern const char *qemu_uname_release;
 144 extern unsigned long mmap_min_addr;
 145
 146 /* ??? See if we can avoid exposing so much of the loader internals.  */
 147 /*
 148  * MAX_ARG_PAGES defines the number of pages allocated for arguments
 149  * and envelope for the new program. 32 should suffice, this gives
 150  * a maximum env+arg of 128kB w/4KB pages!
 151  */
 152 #define MAX_ARG_PAGES 33
 153
 154 /* Read a good amount of data initially, to hopefully get all the
 155    program headers loaded.  */
 156 #define BPRM_BUF_SIZE  1024
 157
 158 /*
 159  * This structure is used to hold the arguments that are
 160  * used when loading binaries.
 161  */
 162 struct linux_binprm {
 163         char buf[BPRM_BUF_SIZE] __attribute__((aligned));
 164         void *page[MAX_ARG_PAGES];
 165         abi_ulong p;
 166         int fd;
 167         int e_uid, e_gid;
 168         int argc, envc;
 169         char **argv;
 170         char **envp;
 171         char * filename;        /* Name of binary */
 172         int (*core_dump)(int, const CPUArchState *); /* coredump routine */
 173 };
 174
 175 void do_init_thread(struct target_pt_regs *regs, struct image_info *infop);
 176 abi_ulong loader_build_argptr(int envc, int argc, abi_ulong sp,
 177                               abi_ulong stringp, int push_ptr);
 178 int loader_exec(int fdexec, const char *filename, char **argv, char **envp,
 179              struct target_pt_regs * regs, struct image_info *infop,
 180              struct linux_binprm *);
 181
 182 int load_elf_binary(struct linux_binprm *bprm, struct image_info *info);
 183 int load_flt_binary(struct linux_binprm *bprm, struct image_info *info);
 184
 185 abi_long memcpy_to_target(abi_ulong dest, const void *src,
 186                           unsigned long len);
 187 void target_set_brk(abi_ulong new_brk);
 188 abi_long do_brk(abi_ulong new_brk);
 189 void syscall_init(void);
 190 abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
 191                     abi_long arg2, abi_long arg3, abi_long arg4,
 192                     abi_long arg5, abi_long arg6, abi_long arg7,
 193                     abi_long arg8);
 194 void gemu_log(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
 195 extern THREAD CPUState *thread_cpu;
 196 void cpu_loop(CPUArchState *env);
 197 char *target_strerror(int err);
 198 int get_osversion(void);
 199 void init_qemu_uname_release(void);
 200 void fork_start(void);
 201 void fork_end(int child);
 202
 203 /* Creates the initial guest address space in the host memory space using
 204  * the given host start address hint and size.  The guest_start parameter
 205  * specifies the start address of the guest space.  guest_base will be the
 206  * difference between the host start address computed by this function and
 207  * guest_start.  If fixed is specified, then the mapped address space must
 208  * start at host_start.  The real start address of the mapped memory space is
 209  * returned or -1 if there was an error.
 210  */
 211 unsigned long init_guest_space(unsigned long host_start,
 212                                unsigned long host_size,
 213                                unsigned long guest_start,
 214                                bool fixed);
 215
 216 #include "qemu/log.h"
 217
 218 /* syscall.c */
 219 int host_to_target_waitstatus(int status);
 220
 221 /* strace.c */
 222 void print_syscall(int num,
 223                    abi_long arg1, abi_long arg2, abi_long arg3,
 224                    abi_long arg4, abi_long arg5, abi_long arg6);
 225 void print_syscall_ret(int num, abi_long arg1);
 226 extern int do_strace;
 227
 228 /* signal.c */
 229 void process_pending_signals(CPUArchState *cpu_env);
 230 void signal_init(void);
 231 int queue_signal(CPUArchState *env, int sig, target_siginfo_t *info);
 232 void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info);
 233 void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo);
 234 int target_to_host_signal(int sig);
 235 int host_to_target_signal(int sig);
 236 long do_sigreturn(CPUArchState *env);
 237 long do_rt_sigreturn(CPUArchState *env);
 238 abi_long do_sigaltstack(abi_ulong uss_addr, abi_ulong uoss_addr, abi_ulong sp);
 239 int do_sigprocmask(int how, const sigset_t *set, sigset_t *oldset);
 240
 241 #ifdef TARGET_I386
 242 /* vm86.c */
 243 void save_v86_state(CPUX86State *env);
 244 void handle_vm86_trap(CPUX86State *env, int trapno);
 245 void handle_vm86_fault(CPUX86State *env);
 246 int do_vm86(CPUX86State *env, long subfunction, abi_ulong v86_addr);
 247 #elif defined(TARGET_SPARC64)
 248 void sparc64_set_context(CPUSPARCState *env);
 249 void sparc64_get_context(CPUSPARCState *env);
 250 #endif
 251
 252 /* mmap.c */
 253 int target_mprotect(abi_ulong start, abi_ulong len, int prot);
 254 abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
 255                      int flags, int fd, abi_ulong offset);
 256 int target_munmap(abi_ulong start, abi_ulong len);
 257 abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,
 258                        abi_ulong new_size, unsigned long flags,
 259                        abi_ulong new_addr);
 260 int target_msync(abi_ulong start, abi_ulong len, int flags);
 261 extern unsigned long last_brk;
 262 extern abi_ulong mmap_next_start;
 263 void mmap_lock(void);
 264 void mmap_unlock(void);
 265 abi_ulong mmap_find_vma(abi_ulong, abi_ulong);
 266 void cpu_list_lock(void);
 267 void cpu_list_unlock(void);
 268 void mmap_fork_start(void);
 269 void mmap_fork_end(int child);
 270
 271 /* main.c */
 272 extern unsigned long guest_stack_size;
 273
 274 /* user access */
 275
 276 #define VERIFY_READ 0
 277 #define VERIFY_WRITE 1 /* implies read access */
 278
 279 static inline int access_ok(int type, abi_ulong addr, abi_ulong size)
 280 {
 281     return page_check_range((target_ulong)addr, size,
 282                             (type == VERIFY_READ) ? PAGE_READ : (PAGE_READ | PAGE_WRITE)) == 0;
 283 }
 284
 285 /* NOTE __get_user and __put_user use host pointers and don't check access.
 286    These are usually used to access struct data members once the struct has
 287    been locked - usually with lock_user_struct.  */
 288
 289 /* Tricky points:
 290    - Use __builtin_choose_expr to avoid type promotion from ?:,
 291    - Invalid sizes result in a compile time error stemming from
 292      the fact that abort has no parameters.
 293    - It's easier to use the endian-specific unaligned load/store
 294      functions than host-endian unaligned load/store plus tswapN.  */
 295
 296 #define __put_user_e(x, hptr, e)                                        \
 297   (__builtin_choose_expr(sizeof(*(hptr)) == 1, stb_p,                   \
 298    __builtin_choose_expr(sizeof(*(hptr)) == 2, stw_##e##_p,             \
 299    __builtin_choose_expr(sizeof(*(hptr)) == 4, stl_##e##_p,             \
 300    __builtin_choose_expr(sizeof(*(hptr)) == 8, stq_##e##_p, abort))))   \
 301      ((hptr), (x)), 0)
 302
 303 #define __get_user_e(x, hptr, e)                                        \
 304   ((x) = (typeof(*hptr))(                                               \
 305    __builtin_choose_expr(sizeof(*(hptr)) == 1, ldub_p,                  \
 306    __builtin_choose_expr(sizeof(*(hptr)) == 2, lduw_##e##_p,            \
 307    __builtin_choose_expr(sizeof(*(hptr)) == 4, ldl_##e##_p,             \
 308    __builtin_choose_expr(sizeof(*(hptr)) == 8, ldq_##e##_p, abort))))   \
 309      (hptr)), 0)
 310
 311 #ifdef TARGET_WORDS_BIGENDIAN
 312 # define __put_user(x, hptr)  __put_user_e(x, hptr, be)
 313 # define __get_user(x, hptr)  __get_user_e(x, hptr, be)
 314 #else
 315 # define __put_user(x, hptr)  __put_user_e(x, hptr, le)
 316 # define __get_user(x, hptr)  __get_user_e(x, hptr, le)
 317 #endif
 318
 319 /* put_user()/get_user() take a guest address and check access */
 320 /* These are usually used to access an atomic data type, such as an int,
 321  * that has been passed by address.  These internally perform locking
 322  * and unlocking on the data type.
 323  */
 324 #define put_user(x, gaddr, target_type)                                 \
 325 ({                                                                      \
 326     abi_ulong __gaddr = (gaddr);                                        \
 327     target_type *__hptr;                                                \
 328     abi_long __ret;                                                     \
 329     if ((__hptr = lock_user(VERIFY_WRITE, __gaddr, sizeof(target_type), 0))) { \
 330         __ret = __put_user((x), __hptr);                                \
 331         unlock_user(__hptr, __gaddr, sizeof(target_type));              \
 332     } else                                                              \
 333         __ret = -TARGET_EFAULT;                                         \
 334     __ret;                                                              \
 335 })
 336
 337 #define get_user(x, gaddr, target_type)                                 \
 338 ({                                                                      \
 339     abi_ulong __gaddr = (gaddr);                                        \
 340     target_type *__hptr;                                                \
 341     abi_long __ret;                                                     \
 342     if ((__hptr = lock_user(VERIFY_READ, __gaddr, sizeof(target_type), 1))) { \
 343         __ret = __get_user((x), __hptr);                                \
 344         unlock_user(__hptr, __gaddr, 0);                                \
 345     } else {                                                            \
 346         /* avoid warning */                                             \
 347         (x) = 0;                                                        \
 348         __ret = -TARGET_EFAULT;                                         \
 349     }                                                                   \
 350     __ret;                                                              \
 351 })
 352
 353 #define put_user_ual(x, gaddr) put_user((x), (gaddr), abi_ulong)
 354 #define put_user_sal(x, gaddr) put_user((x), (gaddr), abi_long)
 355 #define put_user_u64(x, gaddr) put_user((x), (gaddr), uint64_t)
 356 #define put_user_s64(x, gaddr) put_user((x), (gaddr), int64_t)
 357 #define put_user_u32(x, gaddr) put_user((x), (gaddr), uint32_t)
 358 #define put_user_s32(x, gaddr) put_user((x), (gaddr), int32_t)
 359 #define put_user_u16(x, gaddr) put_user((x), (gaddr), uint16_t)
 360 #define put_user_s16(x, gaddr) put_user((x), (gaddr), int16_t)
 361 #define put_user_u8(x, gaddr)  put_user((x), (gaddr), uint8_t)
 362 #define put_user_s8(x, gaddr)  put_user((x), (gaddr), int8_t)
 363
 364 #define get_user_ual(x, gaddr) get_user((x), (gaddr), abi_ulong)
 365 #define get_user_sal(x, gaddr) get_user((x), (gaddr), abi_long)
 366 #define get_user_u64(x, gaddr) get_user((x), (gaddr), uint64_t)
 367 #define get_user_s64(x, gaddr) get_user((x), (gaddr), int64_t)
 368 #define get_user_u32(x, gaddr) get_user((x), (gaddr), uint32_t)
 369 #define get_user_s32(x, gaddr) get_user((x), (gaddr), int32_t)
 370 #define get_user_u16(x, gaddr) get_user((x), (gaddr), uint16_t)
 371 #define get_user_s16(x, gaddr) get_user((x), (gaddr), int16_t)
 372 #define get_user_u8(x, gaddr)  get_user((x), (gaddr), uint8_t)
 373 #define get_user_s8(x, gaddr)  get_user((x), (gaddr), int8_t)
 374
 375 /* copy_from_user() and copy_to_user() are usually used to copy data
 376  * buffers between the target and host.  These internally perform
 377  * locking/unlocking of the memory.
 378  */
 379 abi_long copy_from_user(void *hptr, abi_ulong gaddr, size_t len);
 380 abi_long copy_to_user(abi_ulong gaddr, void *hptr, size_t len);
 381
 382 /* Functions for accessing guest memory.  The tget and tput functions
 383    read/write single values, byteswapping as necessary.  The lock_user function
 384    gets a pointer to a contiguous area of guest memory, but does not perform
 385    any byteswapping.  lock_user may return either a pointer to the guest
 386    memory, or a temporary buffer.  */
 387
 388 /* Lock an area of guest memory into the host.  If copy is true then the
 389    host area will have the same contents as the guest.  */
 390 static inline void *lock_user(int type, abi_ulong guest_addr, long len, int copy)
 391 {
 392     if (!access_ok(type, guest_addr, len))
 393         return NULL;
 394 #ifdef DEBUG_REMAP
 395     {
 396         void *addr;
 397         addr = malloc(len);
 398         if (copy)
 399             memcpy(addr, g2h(guest_addr), len);
 400         else
 401             memset(addr, 0, len);
 402         return addr;
 403     }
 404 #else
 405     return g2h(guest_addr);
 406 #endif
 407 }
 408
 409 /* Unlock an area of guest memory.  The first LEN bytes must be
 410    flushed back to guest memory. host_ptr = NULL is explicitly
 411    allowed and does nothing. */
 412 static inline void unlock_user(void *host_ptr, abi_ulong guest_addr,
 413                                long len)
 414 {
 415
 416 #ifdef DEBUG_REMAP
 417     if (!host_ptr)
 418         return;
 419     if (host_ptr == g2h(guest_addr))
 420         return;
 421     if (len > 0)
 422         memcpy(g2h(guest_addr), host_ptr, len);
 423     free(host_ptr);
 424 #endif
 425 }
 426
 427 /* Return the length of a string in target memory or -TARGET_EFAULT if
 428    access error. */
 429 abi_long target_strlen(abi_ulong gaddr);
 430
 431 /* Like lock_user but for null terminated strings.  */
 432 static inline void *lock_user_string(abi_ulong guest_addr)
 433 {
 434     abi_long len;
 435     len = target_strlen(guest_addr);
 436     if (len < 0)
 437         return NULL;
 438     return lock_user(VERIFY_READ, guest_addr, (long)(len + 1), 1);
 439 }
 440
 441 /* Helper macros for locking/unlocking a target struct.  */
 442 #define lock_user_struct(type, host_ptr, guest_addr, copy)      \
 443     (host_ptr = lock_user(type, guest_addr, sizeof(*host_ptr), copy))
 444 #define unlock_user_struct(host_ptr, guest_addr, copy)          \
 445     unlock_user(host_ptr, guest_addr, (copy) ? sizeof(*host_ptr) : 0)
 446
 447 #include <pthread.h>
 448
 449 /* Include target-specific struct and function definitions;
 450  * they may need access to the target-independent structures
 451  * above, so include them last.
 452  */
 453 #include "target_cpu.h"
 454 #include "target_signal.h"
 455 #include "target_structs.h"
 456
 457 #endif /* QEMU_H */