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 #include "exec/cpu_ldst.h"
   9
  10 #undef DEBUG_REMAP
  11 #ifdef DEBUG_REMAP
  12 #include <stdlib.h>
  13 #endif /* DEBUG_REMAP */
  14
  15 #include "exec/user/abitypes.h"
  16
  17 #include "exec/user/thunk.h"
  18 #include "syscall_defs.h"
  19 #include "syscall.h"
  20 #include "exec/gdbstub.h"
  21 #include "qemu/queue.h"
  22
  23 #define THREAD __thread
  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       mmap;
  40         abi_ulong       rss;
  41         abi_ulong       start_stack;
  42         abi_ulong       stack_limit;
  43         abi_ulong       entry;
  44         abi_ulong       code_offset;
  45         abi_ulong       data_offset;
  46         abi_ulong       saved_auxv;
  47         abi_ulong       auxv_len;
  48         abi_ulong       arg_start;
  49         abi_ulong       arg_end;
  50         uint32_t        elf_flags;
  51         int             personality;
  52 #ifdef CONFIG_USE_FDPIC
  53         abi_ulong       loadmap_addr;
  54         uint16_t        nsegs;
  55         void           *loadsegs;
  56         abi_ulong       pt_dynamic_addr;
  57         struct image_info *other_info;
  58 #endif
  59 };
  60
  61 #ifdef TARGET_I386
  62 /* Information about the current linux thread */
  63 struct vm86_saved_state {
  64     uint32_t eax; /* return code */
  65     uint32_t ebx;
  66     uint32_t ecx;
  67     uint32_t edx;
  68     uint32_t esi;
  69     uint32_t edi;
  70     uint32_t ebp;
  71     uint32_t esp;
  72     uint32_t eflags;
  73     uint32_t eip;
  74     uint16_t cs, ss, ds, es, fs, gs;
  75 };
  76 #endif
  77
  78 #if defined(TARGET_ARM) && defined(TARGET_ABI32)
  79 /* FPU emulator */
  80 #include "nwfpe/fpa11.h"
  81 #endif
  82
  83 #define MAX_SIGQUEUE_SIZE 1024
  84
  85 struct sigqueue {
  86     struct sigqueue *next;
  87     target_siginfo_t info;
  88 };
  89
  90 struct emulated_sigtable {
  91     int pending; /* true if signal is pending */
  92     struct sigqueue *first;
  93     struct sigqueue info; /* in order to always have memory for the
  94                              first signal, we put it here */
  95 };
  96
  97 /* NOTE: we force a big alignment so that the stack stored after is
  98    aligned too */
  99 typedef struct TaskState {
 100     pid_t ts_tid;     /* tid (or pid) of this task */
 101 #ifdef TARGET_ARM
 102 # ifdef TARGET_ABI32
 103     /* FPA state */
 104     FPA11 fpa;
 105 # endif
 106     int swi_errno;
 107 #endif
 108 #ifdef TARGET_UNICORE32
 109     int swi_errno;
 110 #endif
 111 #if defined(TARGET_I386) && !defined(TARGET_X86_64)
 112     abi_ulong target_v86;
 113     struct vm86_saved_state vm86_saved_regs;
 114     struct target_vm86plus_struct vm86plus;
 115     uint32_t v86flags;
 116     uint32_t v86mask;
 117 #endif
 118     abi_ulong child_tidptr;
 119 #ifdef TARGET_M68K
 120     int sim_syscalls;
 121     abi_ulong tp_value;
 122 #endif
 123 #if defined(TARGET_ARM) || defined(TARGET_M68K) || defined(TARGET_UNICORE32)
 124     /* Extra fields for semihosted binaries.  */
 125     uint32_t heap_base;
 126     uint32_t heap_limit;
 127 #endif
 128     uint32_t stack_base;
 129     int used; /* non zero if used */
 130     bool sigsegv_blocked; /* SIGSEGV blocked by guest */
 131     struct image_info *info;
 132     struct linux_binprm *bprm;
 133
 134     struct emulated_sigtable sigtab[TARGET_NSIG];
 135     struct sigqueue sigqueue_table[MAX_SIGQUEUE_SIZE]; /* siginfo queue */
 136     struct sigqueue *first_free; /* first free siginfo queue entry */
 137     int signal_pending; /* non zero if a signal may be pending */
 138 } __attribute__((aligned(16))) TaskState;
 139
 140 extern char *exec_path;
 141 void init_task_state(TaskState *ts);
 142 void task_settid(TaskState *);
 143 void stop_all_tasks(void);
 144 extern const char *qemu_uname_release;
 145 extern unsigned long mmap_min_addr;
 146
 147 /* ??? See if we can avoid exposing so much of the loader internals.  */
 148 /*
 149  * MAX_ARG_PAGES defines the number of pages allocated for arguments
 150  * and envelope for the new program. 32 should suffice, this gives
 151  * a maximum env+arg of 128kB w/4KB pages!
 152  */
 153 #define MAX_ARG_PAGES 33
 154
 155 /* Read a good amount of data initially, to hopefully get all the
 156    program headers loaded.  */
 157 #define BPRM_BUF_SIZE  1024
 158
 159 /*
 160  * This structure is used to hold the arguments that are
 161  * used when loading binaries.
 162  */
 163 struct linux_binprm {
 164         char buf[BPRM_BUF_SIZE] __attribute__((aligned));
 165         void *page[MAX_ARG_PAGES];
 166         abi_ulong p;
 167         int fd;
 168         int e_uid, e_gid;
 169         int argc, envc;
 170         char **argv;
 171         char **envp;
 172         char * filename;        /* Name of binary */
 173         int (*core_dump)(int, const CPUArchState *); /* coredump routine */
 174 };
 175
 176 void do_init_thread(struct target_pt_regs *regs, struct image_info *infop);
 177 abi_ulong loader_build_argptr(int envc, int argc, abi_ulong sp,
 178                               abi_ulong stringp, int push_ptr);
 179 int loader_exec(int fdexec, const char *filename, char **argv, char **envp,
 180              struct target_pt_regs * regs, struct image_info *infop,
 181              struct linux_binprm *);
 182
 183 int load_elf_binary(struct linux_binprm *bprm, struct image_info *info);
 184 int load_flt_binary(struct linux_binprm *bprm, struct image_info *info);
 185
 186 abi_long memcpy_to_target(abi_ulong dest, const void *src,
 187                           unsigned long len);
 188 void target_set_brk(abi_ulong new_brk);
 189 abi_long do_brk(abi_ulong new_brk);
 190 void syscall_init(void);
 191 abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
 192                     abi_long arg2, abi_long arg3, abi_long arg4,
 193                     abi_long arg5, abi_long arg6, abi_long arg7,
 194                     abi_long arg8);
 195 void gemu_log(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
 196 extern THREAD CPUState *thread_cpu;
 197 void cpu_loop(CPUArchState *env);
 198 char *target_strerror(int err);
 199 int get_osversion(void);
 200 void init_qemu_uname_release(void);
 201 void fork_start(void);
 202 void fork_end(int child);
 203
 204 /* Creates the initial guest address space in the host memory space using
 205  * the given host start address hint and size.  The guest_start parameter
 206  * specifies the start address of the guest space.  guest_base will be the
 207  * difference between the host start address computed by this function and
 208  * guest_start.  If fixed is specified, then the mapped address space must
 209  * start at host_start.  The real start address of the mapped memory space is
 210  * returned or -1 if there was an error.
 211  */
 212 unsigned long init_guest_space(unsigned long host_start,
 213                                unsigned long host_size,
 214                                unsigned long guest_start,
 215                                bool fixed);
 216
 217 #include "qemu/log.h"
 218
 219 /* syscall.c */
 220 int host_to_target_waitstatus(int status);
 221
 222 /* strace.c */
 223 void print_syscall(int num,
 224                    abi_long arg1, abi_long arg2, abi_long arg3,
 225                    abi_long arg4, abi_long arg5, abi_long arg6);
 226 void print_syscall_ret(int num, abi_long arg1);
 227 extern int do_strace;
 228
 229 /* signal.c */
 230 void process_pending_signals(CPUArchState *cpu_env);
 231 void signal_init(void);
 232 int queue_signal(CPUArchState *env, int sig, target_siginfo_t *info);
 233 void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info);
 234 void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo);
 235 int target_to_host_signal(int sig);
 236 int host_to_target_signal(int sig);
 237 long do_sigreturn(CPUArchState *env);
 238 long do_rt_sigreturn(CPUArchState *env);
 239 abi_long do_sigaltstack(abi_ulong uss_addr, abi_ulong uoss_addr, abi_ulong sp);
 240 int do_sigprocmask(int how, const sigset_t *set, sigset_t *oldset);
 241
 242 #ifdef TARGET_I386
 243 /* vm86.c */
 244 void save_v86_state(CPUX86State *env);
 245 void handle_vm86_trap(CPUX86State *env, int trapno);
 246 void handle_vm86_fault(CPUX86State *env);
 247 int do_vm86(CPUX86State *env, long subfunction, abi_ulong v86_addr);
 248 #elif defined(TARGET_SPARC64)
 249 void sparc64_set_context(CPUSPARCState *env);
 250 void sparc64_get_context(CPUSPARCState *env);
 251 #endif
 252
 253 /* mmap.c */
 254 int target_mprotect(abi_ulong start, abi_ulong len, int prot);
 255 abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
 256                      int flags, int fd, abi_ulong offset);
 257 int target_munmap(abi_ulong start, abi_ulong len);
 258 abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,
 259                        abi_ulong new_size, unsigned long flags,
 260                        abi_ulong new_addr);
 261 int target_msync(abi_ulong start, abi_ulong len, int flags);
 262 extern unsigned long last_brk;
 263 extern abi_ulong mmap_next_start;
 264 void mmap_lock(void);
 265 void mmap_unlock(void);
 266 abi_ulong mmap_find_vma(abi_ulong, abi_ulong);
 267 void cpu_list_lock(void);
 268 void cpu_list_unlock(void);
 269 void mmap_fork_start(void);
 270 void mmap_fork_end(int child);
 271
 272 /* main.c */
 273 extern unsigned long guest_stack_size;
 274
 275 /* user access */
 276
 277 #define VERIFY_READ 0
 278 #define VERIFY_WRITE 1 /* implies read access */
 279
 280 static inline int access_ok(int type, abi_ulong addr, abi_ulong size)
 281 {
 282     return page_check_range((target_ulong)addr, size,
 283                             (type == VERIFY_READ) ? PAGE_READ : (PAGE_READ | PAGE_WRITE)) == 0;
 284 }
 285
 286 /* NOTE __get_user and __put_user use host pointers and don't check access.
 287    These are usually used to access struct data members once the struct has
 288    been locked - usually with lock_user_struct.  */
 289
 290 /* Tricky points:
 291    - Use __builtin_choose_expr to avoid type promotion from ?:,
 292    - Invalid sizes result in a compile time error stemming from
 293      the fact that abort has no parameters.
 294    - It's easier to use the endian-specific unaligned load/store
 295      functions than host-endian unaligned load/store plus tswapN.  */
 296
 297 #define __put_user_e(x, hptr, e)                                        \
 298   (__builtin_choose_expr(sizeof(*(hptr)) == 1, stb_p,                   \
 299    __builtin_choose_expr(sizeof(*(hptr)) == 2, stw_##e##_p,             \
 300    __builtin_choose_expr(sizeof(*(hptr)) == 4, stl_##e##_p,             \
 301    __builtin_choose_expr(sizeof(*(hptr)) == 8, stq_##e##_p, abort))))   \
 302      ((hptr), (x)), (void)0)
 303
 304 #define __get_user_e(x, hptr, e)                                        \
 305   ((x) = (typeof(*hptr))(                                               \
 306    __builtin_choose_expr(sizeof(*(hptr)) == 1, ldub_p,                  \
 307    __builtin_choose_expr(sizeof(*(hptr)) == 2, lduw_##e##_p,            \
 308    __builtin_choose_expr(sizeof(*(hptr)) == 4, ldl_##e##_p,             \
 309    __builtin_choose_expr(sizeof(*(hptr)) == 8, ldq_##e##_p, abort))))   \
 310      (hptr)), (void)0)
 311
 312 #ifdef TARGET_WORDS_BIGENDIAN
 313 # define __put_user(x, hptr)  __put_user_e(x, hptr, be)
 314 # define __get_user(x, hptr)  __get_user_e(x, hptr, be)
 315 #else
 316 # define __put_user(x, hptr)  __put_user_e(x, hptr, le)
 317 # define __get_user(x, hptr)  __get_user_e(x, hptr, le)
 318 #endif
 319
 320 /* put_user()/get_user() take a guest address and check access */
 321 /* These are usually used to access an atomic data type, such as an int,
 322  * that has been passed by address.  These internally perform locking
 323  * and unlocking on the data type.
 324  */
 325 #define put_user(x, gaddr, target_type)                                 \
 326 ({                                                                      \
 327     abi_ulong __gaddr = (gaddr);                                        \
 328     target_type *__hptr;                                                \
 329     abi_long __ret = 0;                                                 \
 330     if ((__hptr = lock_user(VERIFY_WRITE, __gaddr, sizeof(target_type), 0))) { \
 331         __put_user((x), __hptr);                                \
 332         unlock_user(__hptr, __gaddr, sizeof(target_type));              \
 333     } else                                                              \
 334         __ret = -TARGET_EFAULT;                                         \
 335     __ret;                                                              \
 336 })
 337
 338 #define get_user(x, gaddr, target_type)                                 \
 339 ({                                                                      \
 340     abi_ulong __gaddr = (gaddr);                                        \
 341     target_type *__hptr;                                                \
 342     abi_long __ret = 0;                                                 \
 343     if ((__hptr = lock_user(VERIFY_READ, __gaddr, sizeof(target_type), 1))) { \
 344         __get_user((x), __hptr);                                \
 345         unlock_user(__hptr, __gaddr, 0);                                \
 346     } else {                                                            \
 347         /* avoid warning */                                             \
 348         (x) = 0;                                                        \
 349         __ret = -TARGET_EFAULT;                                         \
 350     }                                                                   \
 351     __ret;                                                              \
 352 })
 353
 354 #define put_user_ual(x, gaddr) put_user((x), (gaddr), abi_ulong)
 355 #define put_user_sal(x, gaddr) put_user((x), (gaddr), abi_long)
 356 #define put_user_u64(x, gaddr) put_user((x), (gaddr), uint64_t)
 357 #define put_user_s64(x, gaddr) put_user((x), (gaddr), int64_t)
 358 #define put_user_u32(x, gaddr) put_user((x), (gaddr), uint32_t)
 359 #define put_user_s32(x, gaddr) put_user((x), (gaddr), int32_t)
 360 #define put_user_u16(x, gaddr) put_user((x), (gaddr), uint16_t)
 361 #define put_user_s16(x, gaddr) put_user((x), (gaddr), int16_t)
 362 #define put_user_u8(x, gaddr)  put_user((x), (gaddr), uint8_t)
 363 #define put_user_s8(x, gaddr)  put_user((x), (gaddr), int8_t)
 364
 365 #define get_user_ual(x, gaddr) get_user((x), (gaddr), abi_ulong)
 366 #define get_user_sal(x, gaddr) get_user((x), (gaddr), abi_long)
 367 #define get_user_u64(x, gaddr) get_user((x), (gaddr), uint64_t)
 368 #define get_user_s64(x, gaddr) get_user((x), (gaddr), int64_t)
 369 #define get_user_u32(x, gaddr) get_user((x), (gaddr), uint32_t)
 370 #define get_user_s32(x, gaddr) get_user((x), (gaddr), int32_t)
 371 #define get_user_u16(x, gaddr) get_user((x), (gaddr), uint16_t)
 372 #define get_user_s16(x, gaddr) get_user((x), (gaddr), int16_t)
 373 #define get_user_u8(x, gaddr)  get_user((x), (gaddr), uint8_t)
 374 #define get_user_s8(x, gaddr)  get_user((x), (gaddr), int8_t)
 375
 376 /* copy_from_user() and copy_to_user() are usually used to copy data
 377  * buffers between the target and host.  These internally perform
 378  * locking/unlocking of the memory.
 379  */
 380 abi_long copy_from_user(void *hptr, abi_ulong gaddr, size_t len);
 381 abi_long copy_to_user(abi_ulong gaddr, void *hptr, size_t len);
 382
 383 /* Functions for accessing guest memory.  The tget and tput functions
 384    read/write single values, byteswapping as necessary.  The lock_user function
 385    gets a pointer to a contiguous area of guest memory, but does not perform
 386    any byteswapping.  lock_user may return either a pointer to the guest
 387    memory, or a temporary buffer.  */
 388
 389 /* Lock an area of guest memory into the host.  If copy is true then the
 390    host area will have the same contents as the guest.  */
 391 static inline void *lock_user(int type, abi_ulong guest_addr, long len, int copy)
 392 {
 393     if (!access_ok(type, guest_addr, len))
 394         return NULL;
 395 #ifdef DEBUG_REMAP
 396     {
 397         void *addr;
 398         addr = malloc(len);
 399         if (copy)
 400             memcpy(addr, g2h(guest_addr), len);
 401         else
 402             memset(addr, 0, len);
 403         return addr;
 404     }
 405 #else
 406     return g2h(guest_addr);
 407 #endif
 408 }
 409
 410 /* Unlock an area of guest memory.  The first LEN bytes must be
 411    flushed back to guest memory. host_ptr = NULL is explicitly
 412    allowed and does nothing. */
 413 static inline void unlock_user(void *host_ptr, abi_ulong guest_addr,
 414                                long len)
 415 {
 416
 417 #ifdef DEBUG_REMAP
 418     if (!host_ptr)
 419         return;
 420     if (host_ptr == g2h(guest_addr))
 421         return;
 422     if (len > 0)
 423         memcpy(g2h(guest_addr), host_ptr, len);
 424     free(host_ptr);
 425 #endif
 426 }
 427
 428 /* Return the length of a string in target memory or -TARGET_EFAULT if
 429    access error. */
 430 abi_long target_strlen(abi_ulong gaddr);
 431
 432 /* Like lock_user but for null terminated strings.  */
 433 static inline void *lock_user_string(abi_ulong guest_addr)
 434 {
 435     abi_long len;
 436     len = target_strlen(guest_addr);
 437     if (len < 0)
 438         return NULL;
 439     return lock_user(VERIFY_READ, guest_addr, (long)(len + 1), 1);
 440 }
 441
 442 /* Helper macros for locking/unlocking a target struct.  */
 443 #define lock_user_struct(type, host_ptr, guest_addr, copy)      \
 444     (host_ptr = lock_user(type, guest_addr, sizeof(*host_ptr), copy))
 445 #define unlock_user_struct(host_ptr, guest_addr, copy)          \
 446     unlock_user(host_ptr, guest_addr, (copy) ? sizeof(*host_ptr) : 0)
 447
 448 #include <pthread.h>
 449
 450 /* Include target-specific struct and function definitions;
 451  * they may need access to the target-independent structures
 452  * above, so include them last.
 453  */
 454 #include "target_cpu.h"
 455 #include "target_signal.h"
 456 #include "target_structs.h"
 457
 458 #endif /* QEMU_H */