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 "qemu-types.h"
  15
  16 #include "thunk.h"
  17 #include "syscall_defs.h"
  18 #include "syscall.h"
  19 #include "target_signal.h"
  20 #include "gdbstub.h"
  21
  22 #if defined(USE_NPTL)
  23 #define THREAD __thread
  24 #else
  25 #define THREAD
  26 #endif
  27
  28 /* This struct is used to hold certain information about the image.
  29  * Basically, it replicates in user space what would be certain
  30  * task_struct fields in the kernel
  31  */
  32 struct image_info {
  33         abi_ulong       load_addr;
  34         abi_ulong       start_code;
  35         abi_ulong       end_code;
  36         abi_ulong       start_data;
  37         abi_ulong       end_data;
  38         abi_ulong       start_brk;
  39         abi_ulong       brk;
  40         abi_ulong       start_mmap;
  41         abi_ulong       mmap;
  42         abi_ulong       rss;
  43         abi_ulong       start_stack;
  44         abi_ulong       entry;
  45         abi_ulong       code_offset;
  46         abi_ulong       data_offset;
  47         char            **host_argv;
  48         int             personality;
  49 };
  50
  51 #ifdef TARGET_I386
  52 /* Information about the current linux thread */
  53 struct vm86_saved_state {
  54     uint32_t eax; /* return code */
  55     uint32_t ebx;
  56     uint32_t ecx;
  57     uint32_t edx;
  58     uint32_t esi;
  59     uint32_t edi;
  60     uint32_t ebp;
  61     uint32_t esp;
  62     uint32_t eflags;
  63     uint32_t eip;
  64     uint16_t cs, ss, ds, es, fs, gs;
  65 };
  66 #endif
  67
  68 #ifdef TARGET_ARM
  69 /* FPU emulator */
  70 #include "nwfpe/fpa11.h"
  71 #endif
  72
  73 #define MAX_SIGQUEUE_SIZE 1024
  74
  75 struct sigqueue {
  76     struct sigqueue *next;
  77     target_siginfo_t info;
  78 };
  79
  80 struct emulated_sigtable {
  81     int pending; /* true if signal is pending */
  82     struct sigqueue *first;
  83     struct sigqueue info; /* in order to always have memory for the
  84                              first signal, we put it here */
  85 };
  86
  87 /* NOTE: we force a big alignment so that the stack stored after is
  88    aligned too */
  89 typedef struct TaskState {
  90     struct TaskState *next;
  91 #ifdef TARGET_ARM
  92     /* FPA state */
  93     FPA11 fpa;
  94     int swi_errno;
  95 #endif
  96 #if defined(TARGET_I386) && !defined(TARGET_X86_64)
  97     abi_ulong target_v86;
  98     struct vm86_saved_state vm86_saved_regs;
  99     struct target_vm86plus_struct vm86plus;
 100     uint32_t v86flags;
 101     uint32_t v86mask;
 102 #endif
 103 #ifdef TARGET_M68K
 104     int sim_syscalls;
 105 #endif
 106 #if defined(TARGET_ARM) || defined(TARGET_M68K)
 107     /* Extra fields for semihosted binaries.  */
 108     uint32_t stack_base;
 109     uint32_t heap_base;
 110     uint32_t heap_limit;
 111 #endif
 112     int used; /* non zero if used */
 113     struct image_info *info;
 114
 115     struct emulated_sigtable sigtab[TARGET_NSIG];
 116     struct sigqueue sigqueue_table[MAX_SIGQUEUE_SIZE]; /* siginfo queue */
 117     struct sigqueue *first_free; /* first free siginfo queue entry */
 118     int signal_pending; /* non zero if a signal may be pending */
 119
 120     uint8_t stack[0];
 121 } __attribute__((aligned(16))) TaskState;
 122
 123 extern char *exec_path;
 124 void init_task_state(TaskState *ts);
 125 extern const char *qemu_uname_release;
 126
 127 /* ??? See if we can avoid exposing so much of the loader internals.  */
 128 /*
 129  * MAX_ARG_PAGES defines the number of pages allocated for arguments
 130  * and envelope for the new program. 32 should suffice, this gives
 131  * a maximum env+arg of 128kB w/4KB pages!
 132  */
 133 #define MAX_ARG_PAGES 32
 134
 135 /*
 136  * This structure is used to hold the arguments that are
 137  * used when loading binaries.
 138  */
 139 struct linux_binprm {
 140         char buf[128];
 141         void *page[MAX_ARG_PAGES];
 142         abi_ulong p;
 143         int fd;
 144         int e_uid, e_gid;
 145         int argc, envc;
 146         char **argv;
 147         char **envp;
 148         char * filename;        /* Name of binary */
 149 };
 150
 151 void do_init_thread(struct target_pt_regs *regs, struct image_info *infop);
 152 abi_ulong loader_build_argptr(int envc, int argc, abi_ulong sp,
 153                               abi_ulong stringp, int push_ptr);
 154 int loader_exec(const char * filename, char ** argv, char ** envp,
 155              struct target_pt_regs * regs, struct image_info *infop);
 156
 157 int load_elf_binary(struct linux_binprm * bprm, struct target_pt_regs * regs,
 158                     struct image_info * info);
 159 int load_flt_binary(struct linux_binprm * bprm, struct target_pt_regs * regs,
 160                     struct image_info * info);
 161 #ifdef TARGET_HAS_ELFLOAD32
 162 int load_elf_binary_multi(struct linux_binprm *bprm,
 163                           struct target_pt_regs *regs,
 164                           struct image_info *info);
 165 #endif
 166
 167 abi_long memcpy_to_target(abi_ulong dest, const void *src,
 168                           unsigned long len);
 169 void target_set_brk(abi_ulong new_brk);
 170 abi_long do_brk(abi_ulong new_brk);
 171 void syscall_init(void);
 172 abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
 173                     abi_long arg2, abi_long arg3, abi_long arg4,
 174                     abi_long arg5, abi_long arg6);
 175 void gemu_log(const char *fmt, ...) __attribute__((format(printf,1,2)));
 176 extern THREAD CPUState *thread_env;
 177 void cpu_loop(CPUState *env);
 178 void init_paths(const char *prefix);
 179 const char *path(const char *pathname);
 180 char *target_strerror(int err);
 181 int get_osversion(void);
 182 void fork_start(void);
 183 void fork_end(int child);
 184
 185 #include "qemu-log.h"
 186
 187 /* strace.c */
 188 void print_syscall(int num,
 189                    abi_long arg1, abi_long arg2, abi_long arg3,
 190                    abi_long arg4, abi_long arg5, abi_long arg6);
 191 void print_syscall_ret(int num, abi_long arg1);
 192 extern int do_strace;
 193
 194 /* signal.c */
 195 void process_pending_signals(CPUState *cpu_env);
 196 void signal_init(void);
 197 int queue_signal(CPUState *env, int sig, target_siginfo_t *info);
 198 void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info);
 199 void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo);
 200 int target_to_host_signal(int sig);
 201 long do_sigreturn(CPUState *env);
 202 long do_rt_sigreturn(CPUState *env);
 203 abi_long do_sigaltstack(abi_ulong uss_addr, abi_ulong uoss_addr, abi_ulong sp);
 204
 205 #ifdef TARGET_I386
 206 /* vm86.c */
 207 void save_v86_state(CPUX86State *env);
 208 void handle_vm86_trap(CPUX86State *env, int trapno);
 209 void handle_vm86_fault(CPUX86State *env);
 210 int do_vm86(CPUX86State *env, long subfunction, abi_ulong v86_addr);
 211 #elif defined(TARGET_SPARC64)
 212 void sparc64_set_context(CPUSPARCState *env);
 213 void sparc64_get_context(CPUSPARCState *env);
 214 #endif
 215
 216 /* mmap.c */
 217 int target_mprotect(abi_ulong start, abi_ulong len, int prot);
 218 abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
 219                      int flags, int fd, abi_ulong offset);
 220 int target_munmap(abi_ulong start, abi_ulong len);
 221 abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,
 222                        abi_ulong new_size, unsigned long flags,
 223                        abi_ulong new_addr);
 224 int target_msync(abi_ulong start, abi_ulong len, int flags);
 225 extern unsigned long last_brk;
 226 void mmap_lock(void);
 227 void mmap_unlock(void);
 228 #if defined(USE_NPTL)
 229 void mmap_fork_start(void);
 230 void mmap_fork_end(int child);
 231 #endif
 232
 233 /* main.c */
 234 extern unsigned long x86_stack_size;
 235
 236 /* user access */
 237
 238 #define VERIFY_READ 0
 239 #define VERIFY_WRITE 1 /* implies read access */
 240
 241 static inline int access_ok(int type, abi_ulong addr, abi_ulong size)
 242 {
 243     return page_check_range((target_ulong)addr, size,
 244                             (type == VERIFY_READ) ? PAGE_READ : (PAGE_READ | PAGE_WRITE)) == 0;
 245 }
 246
 247 /* NOTE __get_user and __put_user use host pointers and don't check access. */
 248 /* These are usually used to access struct data members once the
 249  * struct has been locked - usually with lock_user_struct().
 250  */
 251 #define __put_user(x, hptr)\
 252 ({\
 253     int size = sizeof(*hptr);\
 254     switch(size) {\
 255     case 1:\
 256         *(uint8_t *)(hptr) = (uint8_t)(typeof(*hptr))(x);\
 257         break;\
 258     case 2:\
 259         *(uint16_t *)(hptr) = tswap16((typeof(*hptr))(x));\
 260         break;\
 261     case 4:\
 262         *(uint32_t *)(hptr) = tswap32((typeof(*hptr))(x));\
 263         break;\
 264     case 8:\
 265         *(uint64_t *)(hptr) = tswap64((typeof(*hptr))(x));\
 266         break;\
 267     default:\
 268         abort();\
 269     }\
 270     0;\
 271 })
 272
 273 #define __get_user(x, hptr) \
 274 ({\
 275     int size = sizeof(*hptr);\
 276     switch(size) {\
 277     case 1:\
 278         x = (typeof(*hptr))*(uint8_t *)(hptr);\
 279         break;\
 280     case 2:\
 281         x = (typeof(*hptr))tswap16(*(uint16_t *)(hptr));\
 282         break;\
 283     case 4:\
 284         x = (typeof(*hptr))tswap32(*(uint32_t *)(hptr));\
 285         break;\
 286     case 8:\
 287         x = (typeof(*hptr))tswap64(*(uint64_t *)(hptr));\
 288         break;\
 289     default:\
 290         /* avoid warning */\
 291         x = 0;\
 292         abort();\
 293     }\
 294     0;\
 295 })
 296
 297 /* put_user()/get_user() take a guest address and check access */
 298 /* These are usually used to access an atomic data type, such as an int,
 299  * that has been passed by address.  These internally perform locking
 300  * and unlocking on the data type.
 301  */
 302 #define put_user(x, gaddr, target_type)                                 \
 303 ({                                                                      \
 304     abi_ulong __gaddr = (gaddr);                                        \
 305     target_type *__hptr;                                                \
 306     abi_long __ret;                                                     \
 307     if ((__hptr = lock_user(VERIFY_WRITE, __gaddr, sizeof(target_type), 0))) { \
 308         __ret = __put_user((x), __hptr);                                \
 309         unlock_user(__hptr, __gaddr, sizeof(target_type));              \
 310     } else                                                              \
 311         __ret = -TARGET_EFAULT;                                         \
 312     __ret;                                                              \
 313 })
 314
 315 #define get_user(x, gaddr, target_type)                                 \
 316 ({                                                                      \
 317     abi_ulong __gaddr = (gaddr);                                        \
 318     target_type *__hptr;                                                \
 319     abi_long __ret;                                                     \
 320     if ((__hptr = lock_user(VERIFY_READ, __gaddr, sizeof(target_type), 1))) { \
 321         __ret = __get_user((x), __hptr);                                \
 322         unlock_user(__hptr, __gaddr, 0);                                \
 323     } else {                                                            \
 324         /* avoid warning */                                             \
 325         (x) = 0;                                                        \
 326         __ret = -TARGET_EFAULT;                                         \
 327     }                                                                   \
 328     __ret;                                                              \
 329 })
 330
 331 #define put_user_ual(x, gaddr) put_user((x), (gaddr), abi_ulong)
 332 #define put_user_sal(x, gaddr) put_user((x), (gaddr), abi_long)
 333 #define put_user_u64(x, gaddr) put_user((x), (gaddr), uint64_t)
 334 #define put_user_s64(x, gaddr) put_user((x), (gaddr), int64_t)
 335 #define put_user_u32(x, gaddr) put_user((x), (gaddr), uint32_t)
 336 #define put_user_s32(x, gaddr) put_user((x), (gaddr), int32_t)
 337 #define put_user_u16(x, gaddr) put_user((x), (gaddr), uint16_t)
 338 #define put_user_s16(x, gaddr) put_user((x), (gaddr), int16_t)
 339 #define put_user_u8(x, gaddr)  put_user((x), (gaddr), uint8_t)
 340 #define put_user_s8(x, gaddr)  put_user((x), (gaddr), int8_t)
 341
 342 #define get_user_ual(x, gaddr) get_user((x), (gaddr), abi_ulong)
 343 #define get_user_sal(x, gaddr) get_user((x), (gaddr), abi_long)
 344 #define get_user_u64(x, gaddr) get_user((x), (gaddr), uint64_t)
 345 #define get_user_s64(x, gaddr) get_user((x), (gaddr), int64_t)
 346 #define get_user_u32(x, gaddr) get_user((x), (gaddr), uint32_t)
 347 #define get_user_s32(x, gaddr) get_user((x), (gaddr), int32_t)
 348 #define get_user_u16(x, gaddr) get_user((x), (gaddr), uint16_t)
 349 #define get_user_s16(x, gaddr) get_user((x), (gaddr), int16_t)
 350 #define get_user_u8(x, gaddr)  get_user((x), (gaddr), uint8_t)
 351 #define get_user_s8(x, gaddr)  get_user((x), (gaddr), int8_t)
 352
 353 /* copy_from_user() and copy_to_user() are usually used to copy data
 354  * buffers between the target and host.  These internally perform
 355  * locking/unlocking of the memory.
 356  */
 357 abi_long copy_from_user(void *hptr, abi_ulong gaddr, size_t len);
 358 abi_long copy_to_user(abi_ulong gaddr, void *hptr, size_t len);
 359
 360 /* Functions for accessing guest memory.  The tget and tput functions
 361    read/write single values, byteswapping as neccessary.  The lock_user
 362    gets a pointer to a contiguous area of guest memory, but does not perform
 363    and byteswapping.  lock_user may return either a pointer to the guest
 364    memory, or a temporary buffer.  */
 365
 366 /* Lock an area of guest memory into the host.  If copy is true then the
 367    host area will have the same contents as the guest.  */
 368 static inline void *lock_user(int type, abi_ulong guest_addr, long len, int copy)
 369 {
 370     if (!access_ok(type, guest_addr, len))
 371         return NULL;
 372 #ifdef DEBUG_REMAP
 373     {
 374         void *addr;
 375         addr = malloc(len);
 376         if (copy)
 377             memcpy(addr, g2h(guest_addr), len);
 378         else
 379             memset(addr, 0, len);
 380         return addr;
 381     }
 382 #else
 383     return g2h(guest_addr);
 384 #endif
 385 }
 386
 387 /* Unlock an area of guest memory.  The first LEN bytes must be
 388    flushed back to guest memory. host_ptr = NULL is explicitly
 389    allowed and does nothing. */
 390 static inline void unlock_user(void *host_ptr, abi_ulong guest_addr,
 391                                long len)
 392 {
 393
 394 #ifdef DEBUG_REMAP
 395     if (!host_ptr)
 396         return;
 397     if (host_ptr == g2h(guest_addr))
 398         return;
 399     if (len > 0)
 400         memcpy(g2h(guest_addr), host_ptr, len);
 401     free(host_ptr);
 402 #endif
 403 }
 404
 405 /* Return the length of a string in target memory or -TARGET_EFAULT if
 406    access error. */
 407 abi_long target_strlen(abi_ulong gaddr);
 408
 409 /* Like lock_user but for null terminated strings.  */
 410 static inline void *lock_user_string(abi_ulong guest_addr)
 411 {
 412     abi_long len;
 413     len = target_strlen(guest_addr);
 414     if (len < 0)
 415         return NULL;
 416     return lock_user(VERIFY_READ, guest_addr, (long)(len + 1), 1);
 417 }
 418
 419 /* Helper macros for locking/ulocking a target struct.  */
 420 #define lock_user_struct(type, host_ptr, guest_addr, copy)      \
 421     (host_ptr = lock_user(type, guest_addr, sizeof(*host_ptr), copy))
 422 #define unlock_user_struct(host_ptr, guest_addr, copy)          \
 423     unlock_user(host_ptr, guest_addr, (copy) ? sizeof(*host_ptr) : 0)
 424
 425 #if defined(USE_NPTL)
 426 #include <pthread.h>
 427 #endif
 428
 429 #endif /* QEMU_H */