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-user-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 #include "qemu-queue.h"
  22
  23 #if defined(CONFIG_USE_NPTL)
  24 #define THREAD __thread
  25 #else
  26 #define THREAD
  27 #endif
  28
  29 /* This struct is used to hold certain information about the image.
  30  * Basically, it replicates in user space what would be certain
  31  * task_struct fields in the kernel
  32  */
  33 struct image_info {
  34         abi_ulong       load_bias;
  35         abi_ulong       load_addr;
  36         abi_ulong       start_code;
  37         abi_ulong       end_code;
  38         abi_ulong       start_data;
  39         abi_ulong       end_data;
  40         abi_ulong       start_brk;
  41         abi_ulong       brk;
  42         abi_ulong       start_mmap;
  43         abi_ulong       mmap;
  44         abi_ulong       rss;
  45         abi_ulong       start_stack;
  46         abi_ulong       stack_limit;
  47         abi_ulong       entry;
  48         abi_ulong       code_offset;
  49         abi_ulong       data_offset;
  50         abi_ulong       saved_auxv;
  51         abi_ulong       auxv_len;
  52         abi_ulong       arg_start;
  53         abi_ulong       arg_end;
  54         uint32_t        elf_flags;
  55         int             personality;
  56 #ifdef CONFIG_USE_FDPIC
  57         abi_ulong       loadmap_addr;
  58         uint16_t        nsegs;
  59         void           *loadsegs;
  60         abi_ulong       pt_dynamic_addr;
  61         struct image_info *other_info;
  62 #endif
  63 };
  64
  65 #ifdef TARGET_I386
  66 /* Information about the current linux thread */
  67 struct vm86_saved_state {
  68     uint32_t eax; /* return code */
  69     uint32_t ebx;
  70     uint32_t ecx;
  71     uint32_t edx;
  72     uint32_t esi;
  73     uint32_t edi;
  74     uint32_t ebp;
  75     uint32_t esp;
  76     uint32_t eflags;
  77     uint32_t eip;
  78     uint16_t cs, ss, ds, es, fs, gs;
  79 };
  80 #endif
  81
  82 #ifdef TARGET_ARM
  83 /* FPU emulator */
  84 #include "nwfpe/fpa11.h"
  85 #endif
  86
  87 #define MAX_SIGQUEUE_SIZE 1024
  88
  89 struct sigqueue {
  90     struct sigqueue *next;
  91     target_siginfo_t info;
  92 };
  93
  94 struct emulated_sigtable {
  95     int pending; /* true if signal is pending */
  96     struct sigqueue *first;
  97     struct sigqueue info; /* in order to always have memory for the
  98                              first signal, we put it here */
  99 };
 100
 101 /* NOTE: we force a big alignment so that the stack stored after is
 102    aligned too */
 103 typedef struct TaskState {
 104     pid_t ts_tid;     /* tid (or pid) of this task */
 105 #ifdef TARGET_ARM
 106     /* FPA state */
 107     FPA11 fpa;
 108     int swi_errno;
 109 #endif
 110 #ifdef TARGET_UNICORE32
 111     int swi_errno;
 112 #endif
 113 #if defined(TARGET_I386) && !defined(TARGET_X86_64)
 114     abi_ulong target_v86;
 115     struct vm86_saved_state vm86_saved_regs;
 116     struct target_vm86plus_struct vm86plus;
 117     uint32_t v86flags;
 118     uint32_t v86mask;
 119 #endif
 120 #ifdef CONFIG_USE_NPTL
 121     abi_ulong child_tidptr;
 122 #endif
 123 #ifdef TARGET_M68K
 124     int sim_syscalls;
 125 #endif
 126 #if defined(TARGET_ARM) || defined(TARGET_M68K) || defined(TARGET_UNICORE32)
 127     /* Extra fields for semihosted binaries.  */
 128     uint32_t heap_base;
 129     uint32_t heap_limit;
 130 #endif
 131     uint32_t stack_base;
 132     int used; /* non zero if used */
 133     struct image_info *info;
 134     struct linux_binprm *bprm;
 135
 136     struct emulated_sigtable sigtab[TARGET_NSIG];
 137     struct sigqueue sigqueue_table[MAX_SIGQUEUE_SIZE]; /* siginfo queue */
 138     struct sigqueue *first_free; /* first free siginfo queue entry */
 139     int signal_pending; /* non zero if a signal may be pending */
 140 } __attribute__((aligned(16))) TaskState;
 141
 142 extern char *exec_path;
 143 void init_task_state(TaskState *ts);
 144 void task_settid(TaskState *);
 145 void stop_all_tasks(void);
 146 extern const char *qemu_uname_release;
 147 extern unsigned long mmap_min_addr;
 148
 149 /* ??? See if we can avoid exposing so much of the loader internals.  */
 150 /*
 151  * MAX_ARG_PAGES defines the number of pages allocated for arguments
 152  * and envelope for the new program. 32 should suffice, this gives
 153  * a maximum env+arg of 128kB w/4KB pages!
 154  */
 155 #define MAX_ARG_PAGES 33
 156
 157 /* Read a good amount of data initially, to hopefully get all the
 158    program headers loaded.  */
 159 #define BPRM_BUF_SIZE  1024
 160
 161 /*
 162  * This structure is used to hold the arguments that are
 163  * used when loading binaries.
 164  */
 165 struct linux_binprm {
 166         char buf[BPRM_BUF_SIZE] __attribute__((aligned));
 167         void *page[MAX_ARG_PAGES];
 168         abi_ulong p;
 169         int fd;
 170         int e_uid, e_gid;
 171         int argc, envc;
 172         char **argv;
 173         char **envp;
 174         char * filename;        /* Name of binary */
 175         int (*core_dump)(int, const CPUArchState *); /* coredump routine */
 176 };
 177
 178 void do_init_thread(struct target_pt_regs *regs, struct image_info *infop);
 179 abi_ulong loader_build_argptr(int envc, int argc, abi_ulong sp,
 180                               abi_ulong stringp, int push_ptr);
 181 int loader_exec(const char * filename, char ** argv, char ** envp,
 182              struct target_pt_regs * regs, struct image_info *infop,
 183              struct linux_binprm *);
 184
 185 int load_elf_binary(struct linux_binprm * bprm, struct target_pt_regs * regs,
 186                     struct image_info * info);
 187 int load_flt_binary(struct linux_binprm * bprm, struct target_pt_regs * regs,
 188                     struct image_info * info);
 189
 190 abi_long memcpy_to_target(abi_ulong dest, const void *src,
 191                           unsigned long len);
 192 void target_set_brk(abi_ulong new_brk);
 193 abi_long do_brk(abi_ulong new_brk);
 194 void syscall_init(void);
 195 abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
 196                     abi_long arg2, abi_long arg3, abi_long arg4,
 197                     abi_long arg5, abi_long arg6, abi_long arg7,
 198                     abi_long arg8);
 199 void gemu_log(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
 200 extern THREAD CPUArchState *thread_env;
 201 void cpu_loop(CPUArchState *env);
 202 char *target_strerror(int err);
 203 int get_osversion(void);
 204 void fork_start(void);
 205 void fork_end(int child);
 206
 207 /* Creates the initial guest address space in the host memory space using
 208  * the given host start address hint and size.  The guest_start parameter
 209  * specifies the start address of the guest space.  guest_base will be the
 210  * difference between the host start address computed by this function and
 211  * guest_start.  If fixed is specified, then the mapped address space must
 212  * start at host_start.  The real start address of the mapped memory space is
 213  * returned or -1 if there was an error.
 214  */
 215 unsigned long init_guest_space(unsigned long host_start,
 216                                unsigned long host_size,
 217                                unsigned long guest_start,
 218                                bool fixed);
 219
 220 #include "qemu-log.h"
 221
 222 /* syscall.c */
 223 int host_to_target_waitstatus(int status);
 224
 225 /* strace.c */
 226 void print_syscall(int num,
 227                    abi_long arg1, abi_long arg2, abi_long arg3,
 228                    abi_long arg4, abi_long arg5, abi_long arg6);
 229 void print_syscall_ret(int num, abi_long arg1);
 230 extern int do_strace;
 231
 232 /* signal.c */
 233 void process_pending_signals(CPUArchState *cpu_env);
 234 void signal_init(void);
 235 int queue_signal(CPUArchState *env, int sig, target_siginfo_t *info);
 236 void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info);
 237 void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo);
 238 int target_to_host_signal(int sig);
 239 int host_to_target_signal(int sig);
 240 long do_sigreturn(CPUArchState *env);
 241 long do_rt_sigreturn(CPUArchState *env);
 242 abi_long do_sigaltstack(abi_ulong uss_addr, abi_ulong uoss_addr, abi_ulong sp);
 243
 244 #ifdef TARGET_I386
 245 /* vm86.c */
 246 void save_v86_state(CPUX86State *env);
 247 void handle_vm86_trap(CPUX86State *env, int trapno);
 248 void handle_vm86_fault(CPUX86State *env);
 249 int do_vm86(CPUX86State *env, long subfunction, abi_ulong v86_addr);
 250 #elif defined(TARGET_SPARC64)
 251 void sparc64_set_context(CPUSPARCState *env);
 252 void sparc64_get_context(CPUSPARCState *env);
 253 #endif
 254
 255 /* mmap.c */
 256 int target_mprotect(abi_ulong start, abi_ulong len, int prot);
 257 abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
 258                      int flags, int fd, abi_ulong offset);
 259 int target_munmap(abi_ulong start, abi_ulong len);
 260 abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,
 261                        abi_ulong new_size, unsigned long flags,
 262                        abi_ulong new_addr);
 263 int target_msync(abi_ulong start, abi_ulong len, int flags);
 264 extern unsigned long last_brk;
 265 extern abi_ulong mmap_next_start;
 266 void mmap_lock(void);
 267 void mmap_unlock(void);
 268 abi_ulong mmap_find_vma(abi_ulong, abi_ulong);
 269 void cpu_list_lock(void);
 270 void cpu_list_unlock(void);
 271 #if defined(CONFIG_USE_NPTL)
 272 void mmap_fork_start(void);
 273 void mmap_fork_end(int child);
 274 #endif
 275
 276 /* main.c */
 277 extern unsigned long guest_stack_size;
 278
 279 /* user access */
 280
 281 #define VERIFY_READ 0
 282 #define VERIFY_WRITE 1 /* implies read access */
 283
 284 static inline int access_ok(int type, abi_ulong addr, abi_ulong size)
 285 {
 286     return page_check_range((target_ulong)addr, size,
 287                             (type == VERIFY_READ) ? PAGE_READ : (PAGE_READ | PAGE_WRITE)) == 0;
 288 }
 289
 290 /* NOTE __get_user and __put_user use host pointers and don't check access. */
 291 /* These are usually used to access struct data members once the
 292  * struct has been locked - usually with lock_user_struct().
 293  */
 294 #define __put_user(x, hptr)\
 295 ({ __typeof(*hptr) pu_ = (x);\
 296     switch(sizeof(*hptr)) {\
 297     case 1: break;\
 298     case 2: pu_ = tswap16(pu_); break; \
 299     case 4: pu_ = tswap32(pu_); break; \
 300     case 8: pu_ = tswap64(pu_); break; \
 301     default: abort();\
 302     }\
 303     memcpy(hptr, &pu_, sizeof(pu_)); \
 304     0;\
 305 })
 306
 307 #define __get_user(x, hptr) \
 308 ({ __typeof(*hptr) gu_; \
 309     memcpy(&gu_, hptr, sizeof(gu_)); \
 310     switch(sizeof(*hptr)) {\
 311     case 1: break; \
 312     case 2: gu_ = tswap16(gu_); break; \
 313     case 4: gu_ = tswap32(gu_); break; \
 314     case 8: gu_ = tswap64(gu_); break; \
 315     default: abort();\
 316     }\
 317     (x) = gu_; \
 318     0;\
 319 })
 320
 321 /* put_user()/get_user() take a guest address and check access */
 322 /* These are usually used to access an atomic data type, such as an int,
 323  * that has been passed by address.  These internally perform locking
 324  * and unlocking on the data type.
 325  */
 326 #define put_user(x, gaddr, target_type)                                 \
 327 ({                                                                      \
 328     abi_ulong __gaddr = (gaddr);                                        \
 329     target_type *__hptr;                                                \
 330     abi_long __ret;                                                     \
 331     if ((__hptr = lock_user(VERIFY_WRITE, __gaddr, sizeof(target_type), 0))) { \
 332         __ret = __put_user((x), __hptr);                                \
 333         unlock_user(__hptr, __gaddr, sizeof(target_type));              \
 334     } else                                                              \
 335         __ret = -TARGET_EFAULT;                                         \
 336     __ret;                                                              \
 337 })
 338
 339 #define get_user(x, gaddr, target_type)                                 \
 340 ({                                                                      \
 341     abi_ulong __gaddr = (gaddr);                                        \
 342     target_type *__hptr;                                                \
 343     abi_long __ret;                                                     \
 344     if ((__hptr = lock_user(VERIFY_READ, __gaddr, sizeof(target_type), 1))) { \
 345         __ret = __get_user((x), __hptr);                                \
 346         unlock_user(__hptr, __gaddr, 0);                                \
 347     } else {                                                            \
 348         /* avoid warning */                                             \
 349         (x) = 0;                                                        \
 350         __ret = -TARGET_EFAULT;                                         \
 351     }                                                                   \
 352     __ret;                                                              \
 353 })
 354
 355 #define put_user_ual(x, gaddr) put_user((x), (gaddr), abi_ulong)
 356 #define put_user_sal(x, gaddr) put_user((x), (gaddr), abi_long)
 357 #define put_user_u64(x, gaddr) put_user((x), (gaddr), uint64_t)
 358 #define put_user_s64(x, gaddr) put_user((x), (gaddr), int64_t)
 359 #define put_user_u32(x, gaddr) put_user((x), (gaddr), uint32_t)
 360 #define put_user_s32(x, gaddr) put_user((x), (gaddr), int32_t)
 361 #define put_user_u16(x, gaddr) put_user((x), (gaddr), uint16_t)
 362 #define put_user_s16(x, gaddr) put_user((x), (gaddr), int16_t)
 363 #define put_user_u8(x, gaddr)  put_user((x), (gaddr), uint8_t)
 364 #define put_user_s8(x, gaddr)  put_user((x), (gaddr), int8_t)
 365
 366 #define get_user_ual(x, gaddr) get_user((x), (gaddr), abi_ulong)
 367 #define get_user_sal(x, gaddr) get_user((x), (gaddr), abi_long)
 368 #define get_user_u64(x, gaddr) get_user((x), (gaddr), uint64_t)
 369 #define get_user_s64(x, gaddr) get_user((x), (gaddr), int64_t)
 370 #define get_user_u32(x, gaddr) get_user((x), (gaddr), uint32_t)
 371 #define get_user_s32(x, gaddr) get_user((x), (gaddr), int32_t)
 372 #define get_user_u16(x, gaddr) get_user((x), (gaddr), uint16_t)
 373 #define get_user_s16(x, gaddr) get_user((x), (gaddr), int16_t)
 374 #define get_user_u8(x, gaddr)  get_user((x), (gaddr), uint8_t)
 375 #define get_user_s8(x, gaddr)  get_user((x), (gaddr), int8_t)
 376
 377 /* copy_from_user() and copy_to_user() are usually used to copy data
 378  * buffers between the target and host.  These internally perform
 379  * locking/unlocking of the memory.
 380  */
 381 abi_long copy_from_user(void *hptr, abi_ulong gaddr, size_t len);
 382 abi_long copy_to_user(abi_ulong gaddr, void *hptr, size_t len);
 383
 384 /* Functions for accessing guest memory.  The tget and tput functions
 385    read/write single values, byteswapping as necessary.  The lock_user
 386    gets a pointer to a contiguous area of guest memory, but does not perform
 387    and byteswapping.  lock_user may return either a pointer to the guest
 388    memory, or a temporary buffer.  */
 389
 390 /* Lock an area of guest memory into the host.  If copy is true then the
 391    host area will have the same contents as the guest.  */
 392 static inline void *lock_user(int type, abi_ulong guest_addr, long len, int copy)
 393 {
 394     if (!access_ok(type, guest_addr, len))
 395         return NULL;
 396 #ifdef DEBUG_REMAP
 397     {
 398         void *addr;
 399         addr = malloc(len);
 400         if (copy)
 401             memcpy(addr, g2h(guest_addr), len);
 402         else
 403             memset(addr, 0, len);
 404         return addr;
 405     }
 406 #else
 407     return g2h(guest_addr);
 408 #endif
 409 }
 410
 411 /* Unlock an area of guest memory.  The first LEN bytes must be
 412    flushed back to guest memory. host_ptr = NULL is explicitly
 413    allowed and does nothing. */
 414 static inline void unlock_user(void *host_ptr, abi_ulong guest_addr,
 415                                long len)
 416 {
 417
 418 #ifdef DEBUG_REMAP
 419     if (!host_ptr)
 420         return;
 421     if (host_ptr == g2h(guest_addr))
 422         return;
 423     if (len > 0)
 424         memcpy(g2h(guest_addr), host_ptr, len);
 425     free(host_ptr);
 426 #endif
 427 }
 428
 429 /* Return the length of a string in target memory or -TARGET_EFAULT if
 430    access error. */
 431 abi_long target_strlen(abi_ulong gaddr);
 432
 433 /* Like lock_user but for null terminated strings.  */
 434 static inline void *lock_user_string(abi_ulong guest_addr)
 435 {
 436     abi_long len;
 437     len = target_strlen(guest_addr);
 438     if (len < 0)
 439         return NULL;
 440     return lock_user(VERIFY_READ, guest_addr, (long)(len + 1), 1);
 441 }
 442
 443 /* Helper macros for locking/ulocking a target struct.  */
 444 #define lock_user_struct(type, host_ptr, guest_addr, copy)      \
 445     (host_ptr = lock_user(type, guest_addr, sizeof(*host_ptr), copy))
 446 #define unlock_user_struct(host_ptr, guest_addr, copy)          \
 447     unlock_user(host_ptr, guest_addr, (copy) ? sizeof(*host_ptr) : 0)
 448
 449 #if defined(CONFIG_USE_NPTL)
 450 #include <pthread.h>
 451 #endif
 452
 453 #endif /* QEMU_H */