bsd-user/qemu.h

   1 /*
   2  *  qemu bsd user mode definition
   3  *
   4  *  This program is free software; you can redistribute it and/or modify
   5  *  it under the terms of the GNU General Public License as published by
   6  *  the Free Software Foundation; either version 2 of the License, or
   7  *  (at your option) any later version.
   8  *
   9  *  This program is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *  GNU General Public License for more details.
  13  *
  14  *  You should have received a copy of the GNU General Public License
  15  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  16  */
  17 #ifndef QEMU_H
  18 #define QEMU_H
  19
  20
  21 #include "cpu.h"
  22 #include "exec/cpu_ldst.h"
  23
  24 #undef DEBUG_REMAP
  25 #ifdef DEBUG_REMAP
  26 #endif /* DEBUG_REMAP */
  27
  28 #include "exec/user/abitypes.h"
  29
  30 enum BSDType {
  31     target_freebsd,
  32     target_netbsd,
  33     target_openbsd,
  34 };
  35 extern enum BSDType bsd_type;
  36
  37 #include "syscall_defs.h"
  38 #include "target_syscall.h"
  39 #include "target_signal.h"
  40 #include "exec/gdbstub.h"
  41
  42 #if defined(CONFIG_USE_NPTL)
  43 #define THREAD __thread
  44 #else
  45 #define THREAD
  46 #endif
  47
  48 /* This struct is used to hold certain information about the image.
  49  * Basically, it replicates in user space what would be certain
  50  * task_struct fields in the kernel
  51  */
  52 struct image_info {
  53     abi_ulong load_addr;
  54     abi_ulong start_code;
  55     abi_ulong end_code;
  56     abi_ulong start_data;
  57     abi_ulong end_data;
  58     abi_ulong start_brk;
  59     abi_ulong brk;
  60     abi_ulong start_mmap;
  61     abi_ulong mmap;
  62     abi_ulong rss;
  63     abi_ulong start_stack;
  64     abi_ulong entry;
  65     abi_ulong code_offset;
  66     abi_ulong data_offset;
  67     int       personality;
  68 };
  69
  70 #define MAX_SIGQUEUE_SIZE 1024
  71
  72 struct sigqueue {
  73     struct sigqueue *next;
  74     //target_siginfo_t info;
  75 };
  76
  77 struct emulated_sigtable {
  78     int pending; /* true if signal is pending */
  79     struct sigqueue *first;
  80     struct sigqueue info; /* in order to always have memory for the
  81                              first signal, we put it here */
  82 };
  83
  84 /* NOTE: we force a big alignment so that the stack stored after is
  85    aligned too */
  86 typedef struct TaskState {
  87     pid_t ts_tid;     /* tid (or pid) of this task */
  88
  89     struct TaskState *next;
  90     int used; /* non zero if used */
  91     struct image_info *info;
  92
  93     struct emulated_sigtable sigtab[TARGET_NSIG];
  94     struct sigqueue sigqueue_table[MAX_SIGQUEUE_SIZE]; /* siginfo queue */
  95     struct sigqueue *first_free; /* first free siginfo queue entry */
  96     int signal_pending; /* non zero if a signal may be pending */
  97
  98     uint8_t stack[];
  99 } __attribute__((aligned(16))) TaskState;
 100
 101 void init_task_state(TaskState *ts);
 102 extern const char *qemu_uname_release;
 103 extern unsigned long mmap_min_addr;
 104
 105 /* ??? See if we can avoid exposing so much of the loader internals.  */
 106 /*
 107  * MAX_ARG_PAGES defines the number of pages allocated for arguments
 108  * and envelope for the new program. 32 should suffice, this gives
 109  * a maximum env+arg of 128kB w/4KB pages!
 110  */
 111 #define MAX_ARG_PAGES 32
 112
 113 /*
 114  * This structure is used to hold the arguments that are
 115  * used when loading binaries.
 116  */
 117 struct linux_binprm {
 118         char buf[128];
 119         void *page[MAX_ARG_PAGES];
 120         abi_ulong p;
 121         int fd;
 122         int e_uid, e_gid;
 123         int argc, envc;
 124         char **argv;
 125         char **envp;
 126         char * filename;        /* Name of binary */
 127 };
 128
 129 void do_init_thread(struct target_pt_regs *regs, struct image_info *infop);
 130 abi_ulong loader_build_argptr(int envc, int argc, abi_ulong sp,
 131                               abi_ulong stringp, int push_ptr);
 132 int loader_exec(const char * filename, char ** argv, char ** envp,
 133              struct target_pt_regs * regs, struct image_info *infop);
 134
 135 int load_elf_binary(struct linux_binprm * bprm, struct target_pt_regs * regs,
 136                     struct image_info * info);
 137 int load_flt_binary(struct linux_binprm * bprm, struct target_pt_regs * regs,
 138                     struct image_info * info);
 139
 140 abi_long memcpy_to_target(abi_ulong dest, const void *src,
 141                           unsigned long len);
 142 void target_set_brk(abi_ulong new_brk);
 143 abi_long do_brk(abi_ulong new_brk);
 144 void syscall_init(void);
 145 abi_long do_freebsd_syscall(void *cpu_env, int num, abi_long arg1,
 146                             abi_long arg2, abi_long arg3, abi_long arg4,
 147                             abi_long arg5, abi_long arg6, abi_long arg7,
 148                             abi_long arg8);
 149 abi_long do_netbsd_syscall(void *cpu_env, int num, abi_long arg1,
 150                            abi_long arg2, abi_long arg3, abi_long arg4,
 151                            abi_long arg5, abi_long arg6);
 152 abi_long do_openbsd_syscall(void *cpu_env, int num, abi_long arg1,
 153                             abi_long arg2, abi_long arg3, abi_long arg4,
 154                             abi_long arg5, abi_long arg6);
 155 void gemu_log(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
 156 extern THREAD CPUState *thread_cpu;
 157 void cpu_loop(CPUArchState *env);
 158 char *target_strerror(int err);
 159 int get_osversion(void);
 160 void fork_start(void);
 161 void fork_end(int child);
 162
 163 #include "qemu/log.h"
 164
 165 /* strace.c */
 166 struct syscallname {
 167     int nr;
 168     const char *name;
 169     const char *format;
 170     void (*call)(const struct syscallname *,
 171                  abi_long, abi_long, abi_long,
 172                  abi_long, abi_long, abi_long);
 173     void (*result)(const struct syscallname *, abi_long);
 174 };
 175
 176 void
 177 print_freebsd_syscall(int num,
 178                       abi_long arg1, abi_long arg2, abi_long arg3,
 179                       abi_long arg4, abi_long arg5, abi_long arg6);
 180 void print_freebsd_syscall_ret(int num, abi_long ret);
 181 void
 182 print_netbsd_syscall(int num,
 183                      abi_long arg1, abi_long arg2, abi_long arg3,
 184                      abi_long arg4, abi_long arg5, abi_long arg6);
 185 void print_netbsd_syscall_ret(int num, abi_long ret);
 186 void
 187 print_openbsd_syscall(int num,
 188                       abi_long arg1, abi_long arg2, abi_long arg3,
 189                       abi_long arg4, abi_long arg5, abi_long arg6);
 190 void print_openbsd_syscall_ret(int num, abi_long ret);
 191 extern int do_strace;
 192
 193 /* signal.c */
 194 void process_pending_signals(CPUArchState *cpu_env);
 195 void signal_init(void);
 196 //int queue_signal(CPUArchState *env, int sig, target_siginfo_t *info);
 197 //void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info);
 198 //void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo);
 199 long do_sigreturn(CPUArchState *env);
 200 long do_rt_sigreturn(CPUArchState *env);
 201 abi_long do_sigaltstack(abi_ulong uss_addr, abi_ulong uoss_addr, abi_ulong sp);
 202
 203 /* mmap.c */
 204 int target_mprotect(abi_ulong start, abi_ulong len, int prot);
 205 abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
 206                      int flags, int fd, abi_ulong offset);
 207 int target_munmap(abi_ulong start, abi_ulong len);
 208 abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,
 209                        abi_ulong new_size, unsigned long flags,
 210                        abi_ulong new_addr);
 211 int target_msync(abi_ulong start, abi_ulong len, int flags);
 212 extern unsigned long last_brk;
 213 void mmap_fork_start(void);
 214 void mmap_fork_end(int child);
 215
 216 /* main.c */
 217 extern unsigned long x86_stack_size;
 218
 219 /* user access */
 220
 221 #define VERIFY_READ 0
 222 #define VERIFY_WRITE 1 /* implies read access */
 223
 224 static inline int access_ok(int type, abi_ulong addr, abi_ulong size)
 225 {
 226     return page_check_range((target_ulong)addr, size,
 227                             (type == VERIFY_READ) ? PAGE_READ : (PAGE_READ | PAGE_WRITE)) == 0;
 228 }
 229
 230 /* NOTE __get_user and __put_user use host pointers and don't check access. */
 231 /* These are usually used to access struct data members once the
 232  * struct has been locked - usually with lock_user_struct().
 233  */
 234 #define __put_user(x, hptr)\
 235 ({\
 236     int size = sizeof(*hptr);\
 237     switch(size) {\
 238     case 1:\
 239         *(uint8_t *)(hptr) = (uint8_t)(typeof(*hptr))(x);\
 240         break;\
 241     case 2:\
 242         *(uint16_t *)(hptr) = tswap16((typeof(*hptr))(x));\
 243         break;\
 244     case 4:\
 245         *(uint32_t *)(hptr) = tswap32((typeof(*hptr))(x));\
 246         break;\
 247     case 8:\
 248         *(uint64_t *)(hptr) = tswap64((typeof(*hptr))(x));\
 249         break;\
 250     default:\
 251         abort();\
 252     }\
 253     0;\
 254 })
 255
 256 #define __get_user(x, hptr) \
 257 ({\
 258     int size = sizeof(*hptr);\
 259     switch(size) {\
 260     case 1:\
 261         x = (typeof(*hptr))*(uint8_t *)(hptr);\
 262         break;\
 263     case 2:\
 264         x = (typeof(*hptr))tswap16(*(uint16_t *)(hptr));\
 265         break;\
 266     case 4:\
 267         x = (typeof(*hptr))tswap32(*(uint32_t *)(hptr));\
 268         break;\
 269     case 8:\
 270         x = (typeof(*hptr))tswap64(*(uint64_t *)(hptr));\
 271         break;\
 272     default:\
 273         /* avoid warning */\
 274         x = 0;\
 275         abort();\
 276     }\
 277     0;\
 278 })
 279
 280 /* put_user()/get_user() take a guest address and check access */
 281 /* These are usually used to access an atomic data type, such as an int,
 282  * that has been passed by address.  These internally perform locking
 283  * and unlocking on the data type.
 284  */
 285 #define put_user(x, gaddr, target_type)                                 \
 286 ({                                                                      \
 287     abi_ulong __gaddr = (gaddr);                                        \
 288     target_type *__hptr;                                                \
 289     abi_long __ret;                                                     \
 290     if ((__hptr = lock_user(VERIFY_WRITE, __gaddr, sizeof(target_type), 0))) { \
 291         __ret = __put_user((x), __hptr);                                \
 292         unlock_user(__hptr, __gaddr, sizeof(target_type));              \
 293     } else                                                              \
 294         __ret = -TARGET_EFAULT;                                         \
 295     __ret;                                                              \
 296 })
 297
 298 #define get_user(x, gaddr, target_type)                                 \
 299 ({                                                                      \
 300     abi_ulong __gaddr = (gaddr);                                        \
 301     target_type *__hptr;                                                \
 302     abi_long __ret;                                                     \
 303     if ((__hptr = lock_user(VERIFY_READ, __gaddr, sizeof(target_type), 1))) { \
 304         __ret = __get_user((x), __hptr);                                \
 305         unlock_user(__hptr, __gaddr, 0);                                \
 306     } else {                                                            \
 307         /* avoid warning */                                             \
 308         (x) = 0;                                                        \
 309         __ret = -TARGET_EFAULT;                                         \
 310     }                                                                   \
 311     __ret;                                                              \
 312 })
 313
 314 #define put_user_ual(x, gaddr) put_user((x), (gaddr), abi_ulong)
 315 #define put_user_sal(x, gaddr) put_user((x), (gaddr), abi_long)
 316 #define put_user_u64(x, gaddr) put_user((x), (gaddr), uint64_t)
 317 #define put_user_s64(x, gaddr) put_user((x), (gaddr), int64_t)
 318 #define put_user_u32(x, gaddr) put_user((x), (gaddr), uint32_t)
 319 #define put_user_s32(x, gaddr) put_user((x), (gaddr), int32_t)
 320 #define put_user_u16(x, gaddr) put_user((x), (gaddr), uint16_t)
 321 #define put_user_s16(x, gaddr) put_user((x), (gaddr), int16_t)
 322 #define put_user_u8(x, gaddr)  put_user((x), (gaddr), uint8_t)
 323 #define put_user_s8(x, gaddr)  put_user((x), (gaddr), int8_t)
 324
 325 #define get_user_ual(x, gaddr) get_user((x), (gaddr), abi_ulong)
 326 #define get_user_sal(x, gaddr) get_user((x), (gaddr), abi_long)
 327 #define get_user_u64(x, gaddr) get_user((x), (gaddr), uint64_t)
 328 #define get_user_s64(x, gaddr) get_user((x), (gaddr), int64_t)
 329 #define get_user_u32(x, gaddr) get_user((x), (gaddr), uint32_t)
 330 #define get_user_s32(x, gaddr) get_user((x), (gaddr), int32_t)
 331 #define get_user_u16(x, gaddr) get_user((x), (gaddr), uint16_t)
 332 #define get_user_s16(x, gaddr) get_user((x), (gaddr), int16_t)
 333 #define get_user_u8(x, gaddr)  get_user((x), (gaddr), uint8_t)
 334 #define get_user_s8(x, gaddr)  get_user((x), (gaddr), int8_t)
 335
 336 /* copy_from_user() and copy_to_user() are usually used to copy data
 337  * buffers between the target and host.  These internally perform
 338  * locking/unlocking of the memory.
 339  */
 340 abi_long copy_from_user(void *hptr, abi_ulong gaddr, size_t len);
 341 abi_long copy_to_user(abi_ulong gaddr, void *hptr, size_t len);
 342
 343 /* Functions for accessing guest memory.  The tget and tput functions
 344    read/write single values, byteswapping as necessary.  The lock_user function
 345    gets a pointer to a contiguous area of guest memory, but does not perform
 346    any byteswapping.  lock_user may return either a pointer to the guest
 347    memory, or a temporary buffer.  */
 348
 349 /* Lock an area of guest memory into the host.  If copy is true then the
 350    host area will have the same contents as the guest.  */
 351 static inline void *lock_user(int type, abi_ulong guest_addr, long len, int copy)
 352 {
 353     if (!access_ok(type, guest_addr, len))
 354         return NULL;
 355 #ifdef DEBUG_REMAP
 356     {
 357         void *addr;
 358         addr = g_malloc(len);
 359         if (copy)
 360             memcpy(addr, g2h(guest_addr), len);
 361         else
 362             memset(addr, 0, len);
 363         return addr;
 364     }
 365 #else
 366     return g2h(guest_addr);
 367 #endif
 368 }
 369
 370 /* Unlock an area of guest memory.  The first LEN bytes must be
 371    flushed back to guest memory. host_ptr = NULL is explicitly
 372    allowed and does nothing. */
 373 static inline void unlock_user(void *host_ptr, abi_ulong guest_addr,
 374                                long len)
 375 {
 376
 377 #ifdef DEBUG_REMAP
 378     if (!host_ptr)
 379         return;
 380     if (host_ptr == g2h(guest_addr))
 381         return;
 382     if (len > 0)
 383         memcpy(g2h(guest_addr), host_ptr, len);
 384     g_free(host_ptr);
 385 #endif
 386 }
 387
 388 /* Return the length of a string in target memory or -TARGET_EFAULT if
 389    access error. */
 390 abi_long target_strlen(abi_ulong gaddr);
 391
 392 /* Like lock_user but for null terminated strings.  */
 393 static inline void *lock_user_string(abi_ulong guest_addr)
 394 {
 395     abi_long len;
 396     len = target_strlen(guest_addr);
 397     if (len < 0)
 398         return NULL;
 399     return lock_user(VERIFY_READ, guest_addr, (long)(len + 1), 1);
 400 }
 401
 402 /* Helper macros for locking/unlocking a target struct.  */
 403 #define lock_user_struct(type, host_ptr, guest_addr, copy)      \
 404     (host_ptr = lock_user(type, guest_addr, sizeof(*host_ptr), copy))
 405 #define unlock_user_struct(host_ptr, guest_addr, copy)          \
 406     unlock_user(host_ptr, guest_addr, (copy) ? sizeof(*host_ptr) : 0)
 407
 408 #if defined(CONFIG_USE_NPTL)
 409 #include <pthread.h>
 410 #endif
 411
 412 #endif /* QEMU_H */