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 #include <signal.h>
  21 #include <string.h>
  22
  23 #include "cpu.h"
  24 #include "exec/cpu_ldst.h"
  25
  26 #undef DEBUG_REMAP
  27 #ifdef DEBUG_REMAP
  28 #include <stdlib.h>
  29 #endif /* DEBUG_REMAP */
  30
  31 #include "exec/user/abitypes.h"
  32
  33 enum BSDType {
  34     target_freebsd,
  35     target_netbsd,
  36     target_openbsd,
  37 };
  38 extern enum BSDType bsd_type;
  39
  40 #include "syscall_defs.h"
  41 #include "syscall.h"
  42 #include "target_signal.h"
  43 #include "exec/gdbstub.h"
  44
  45 #if defined(CONFIG_USE_NPTL)
  46 #define THREAD __thread
  47 #else
  48 #define THREAD
  49 #endif
  50
  51 /* This struct is used to hold certain information about the image.
  52  * Basically, it replicates in user space what would be certain
  53  * task_struct fields in the kernel
  54  */
  55 struct image_info {
  56     abi_ulong load_addr;
  57     abi_ulong start_code;
  58     abi_ulong end_code;
  59     abi_ulong start_data;
  60     abi_ulong end_data;
  61     abi_ulong start_brk;
  62     abi_ulong brk;
  63     abi_ulong start_mmap;
  64     abi_ulong mmap;
  65     abi_ulong rss;
  66     abi_ulong start_stack;
  67     abi_ulong entry;
  68     abi_ulong code_offset;
  69     abi_ulong data_offset;
  70     int       personality;
  71 };
  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     int used; /* non zero if used */
  92     struct image_info *info;
  93
  94     struct emulated_sigtable sigtab[TARGET_NSIG];
  95     struct sigqueue sigqueue_table[MAX_SIGQUEUE_SIZE]; /* siginfo queue */
  96     struct sigqueue *first_free; /* first free siginfo queue entry */
  97     int signal_pending; /* non zero if a signal may be pending */
  98
  99     uint8_t stack[0];
 100 } __attribute__((aligned(16))) TaskState;
 101
 102 void init_task_state(TaskState *ts);
 103 extern const char *qemu_uname_release;
 104 #if defined(CONFIG_USE_GUEST_BASE)
 105 extern unsigned long mmap_min_addr;
 106 #endif
 107
 108 /* ??? See if we can avoid exposing so much of the loader internals.  */
 109 /*
 110  * MAX_ARG_PAGES defines the number of pages allocated for arguments
 111  * and envelope for the new program. 32 should suffice, this gives
 112  * a maximum env+arg of 128kB w/4KB pages!
 113  */
 114 #define MAX_ARG_PAGES 32
 115
 116 /*
 117  * This structure is used to hold the arguments that are
 118  * used when loading binaries.
 119  */
 120 struct linux_binprm {
 121         char buf[128];
 122         void *page[MAX_ARG_PAGES];
 123         abi_ulong p;
 124         int fd;
 125         int e_uid, e_gid;
 126         int argc, envc;
 127         char **argv;
 128         char **envp;
 129         char * filename;        /* Name of binary */
 130 };
 131
 132 void do_init_thread(struct target_pt_regs *regs, struct image_info *infop);
 133 abi_ulong loader_build_argptr(int envc, int argc, abi_ulong sp,
 134                               abi_ulong stringp, int push_ptr);
 135 int loader_exec(const char * filename, char ** argv, char ** envp,
 136              struct target_pt_regs * regs, struct image_info *infop);
 137
 138 int load_elf_binary(struct linux_binprm * bprm, struct target_pt_regs * regs,
 139                     struct image_info * info);
 140 int load_flt_binary(struct linux_binprm * bprm, struct target_pt_regs * regs,
 141                     struct image_info * info);
 142
 143 abi_long memcpy_to_target(abi_ulong dest, const void *src,
 144                           unsigned long len);
 145 void target_set_brk(abi_ulong new_brk);
 146 abi_long do_brk(abi_ulong new_brk);
 147 void syscall_init(void);
 148 abi_long do_freebsd_syscall(void *cpu_env, int num, abi_long arg1,
 149                             abi_long arg2, abi_long arg3, abi_long arg4,
 150                             abi_long arg5, abi_long arg6, abi_long arg7,
 151                             abi_long arg8);
 152 abi_long do_netbsd_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 abi_long do_openbsd_syscall(void *cpu_env, int num, abi_long arg1,
 156                             abi_long arg2, abi_long arg3, abi_long arg4,
 157                             abi_long arg5, abi_long arg6);
 158 void gemu_log(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
 159 extern THREAD CPUState *thread_cpu;
 160 void cpu_loop(CPUArchState *env);
 161 char *target_strerror(int err);
 162 int get_osversion(void);
 163 void fork_start(void);
 164 void fork_end(int child);
 165
 166 #include "qemu/log.h"
 167
 168 /* strace.c */
 169 struct syscallname {
 170     int nr;
 171     const char *name;
 172     const char *format;
 173     void (*call)(const struct syscallname *,
 174                  abi_long, abi_long, abi_long,
 175                  abi_long, abi_long, abi_long);
 176     void (*result)(const struct syscallname *, abi_long);
 177 };
 178
 179 void
 180 print_freebsd_syscall(int num,
 181                       abi_long arg1, abi_long arg2, abi_long arg3,
 182                       abi_long arg4, abi_long arg5, abi_long arg6);
 183 void print_freebsd_syscall_ret(int num, abi_long ret);
 184 void
 185 print_netbsd_syscall(int num,
 186                      abi_long arg1, abi_long arg2, abi_long arg3,
 187                      abi_long arg4, abi_long arg5, abi_long arg6);
 188 void print_netbsd_syscall_ret(int num, abi_long ret);
 189 void
 190 print_openbsd_syscall(int num,
 191                       abi_long arg1, abi_long arg2, abi_long arg3,
 192                       abi_long arg4, abi_long arg5, abi_long arg6);
 193 void print_openbsd_syscall_ret(int num, abi_long ret);
 194 extern int do_strace;
 195
 196 /* signal.c */
 197 void process_pending_signals(CPUArchState *cpu_env);
 198 void signal_init(void);
 199 //int queue_signal(CPUArchState *env, int sig, target_siginfo_t *info);
 200 //void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info);
 201 //void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo);
 202 long do_sigreturn(CPUArchState *env);
 203 long do_rt_sigreturn(CPUArchState *env);
 204 abi_long do_sigaltstack(abi_ulong uss_addr, abi_ulong uoss_addr, abi_ulong sp);
 205
 206 /* mmap.c */
 207 int target_mprotect(abi_ulong start, abi_ulong len, int prot);
 208 abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
 209                      int flags, int fd, abi_ulong offset);
 210 int target_munmap(abi_ulong start, abi_ulong len);
 211 abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,
 212                        abi_ulong new_size, unsigned long flags,
 213                        abi_ulong new_addr);
 214 int target_msync(abi_ulong start, abi_ulong len, int flags);
 215 extern unsigned long last_brk;
 216 void mmap_lock(void);
 217 void mmap_unlock(void);
 218 void cpu_list_lock(void);
 219 void cpu_list_unlock(void);
 220 #if defined(CONFIG_USE_NPTL)
 221 void mmap_fork_start(void);
 222 void mmap_fork_end(int child);
 223 #endif
 224
 225 /* main.c */
 226 extern unsigned long x86_stack_size;
 227
 228 /* user access */
 229
 230 #define VERIFY_READ 0
 231 #define VERIFY_WRITE 1 /* implies read access */
 232
 233 static inline int access_ok(int type, abi_ulong addr, abi_ulong size)
 234 {
 235     return page_check_range((target_ulong)addr, size,
 236                             (type == VERIFY_READ) ? PAGE_READ : (PAGE_READ | PAGE_WRITE)) == 0;
 237 }
 238
 239 /* NOTE __get_user and __put_user use host pointers and don't check access. */
 240 /* These are usually used to access struct data members once the
 241  * struct has been locked - usually with lock_user_struct().
 242  */
 243 #define __put_user(x, hptr)\
 244 ({\
 245     int size = sizeof(*hptr);\
 246     switch(size) {\
 247     case 1:\
 248         *(uint8_t *)(hptr) = (uint8_t)(typeof(*hptr))(x);\
 249         break;\
 250     case 2:\
 251         *(uint16_t *)(hptr) = tswap16((typeof(*hptr))(x));\
 252         break;\
 253     case 4:\
 254         *(uint32_t *)(hptr) = tswap32((typeof(*hptr))(x));\
 255         break;\
 256     case 8:\
 257         *(uint64_t *)(hptr) = tswap64((typeof(*hptr))(x));\
 258         break;\
 259     default:\
 260         abort();\
 261     }\
 262     0;\
 263 })
 264
 265 #define __get_user(x, hptr) \
 266 ({\
 267     int size = sizeof(*hptr);\
 268     switch(size) {\
 269     case 1:\
 270         x = (typeof(*hptr))*(uint8_t *)(hptr);\
 271         break;\
 272     case 2:\
 273         x = (typeof(*hptr))tswap16(*(uint16_t *)(hptr));\
 274         break;\
 275     case 4:\
 276         x = (typeof(*hptr))tswap32(*(uint32_t *)(hptr));\
 277         break;\
 278     case 8:\
 279         x = (typeof(*hptr))tswap64(*(uint64_t *)(hptr));\
 280         break;\
 281     default:\
 282         /* avoid warning */\
 283         x = 0;\
 284         abort();\
 285     }\
 286     0;\
 287 })
 288
 289 /* put_user()/get_user() take a guest address and check access */
 290 /* These are usually used to access an atomic data type, such as an int,
 291  * that has been passed by address.  These internally perform locking
 292  * and unlocking on the data type.
 293  */
 294 #define put_user(x, gaddr, target_type)                                 \
 295 ({                                                                      \
 296     abi_ulong __gaddr = (gaddr);                                        \
 297     target_type *__hptr;                                                \
 298     abi_long __ret;                                                     \
 299     if ((__hptr = lock_user(VERIFY_WRITE, __gaddr, sizeof(target_type), 0))) { \
 300         __ret = __put_user((x), __hptr);                                \
 301         unlock_user(__hptr, __gaddr, sizeof(target_type));              \
 302     } else                                                              \
 303         __ret = -TARGET_EFAULT;                                         \
 304     __ret;                                                              \
 305 })
 306
 307 #define get_user(x, gaddr, target_type)                                 \
 308 ({                                                                      \
 309     abi_ulong __gaddr = (gaddr);                                        \
 310     target_type *__hptr;                                                \
 311     abi_long __ret;                                                     \
 312     if ((__hptr = lock_user(VERIFY_READ, __gaddr, sizeof(target_type), 1))) { \
 313         __ret = __get_user((x), __hptr);                                \
 314         unlock_user(__hptr, __gaddr, 0);                                \
 315     } else {                                                            \
 316         /* avoid warning */                                             \
 317         (x) = 0;                                                        \
 318         __ret = -TARGET_EFAULT;                                         \
 319     }                                                                   \
 320     __ret;                                                              \
 321 })
 322
 323 #define put_user_ual(x, gaddr) put_user((x), (gaddr), abi_ulong)
 324 #define put_user_sal(x, gaddr) put_user((x), (gaddr), abi_long)
 325 #define put_user_u64(x, gaddr) put_user((x), (gaddr), uint64_t)
 326 #define put_user_s64(x, gaddr) put_user((x), (gaddr), int64_t)
 327 #define put_user_u32(x, gaddr) put_user((x), (gaddr), uint32_t)
 328 #define put_user_s32(x, gaddr) put_user((x), (gaddr), int32_t)
 329 #define put_user_u16(x, gaddr) put_user((x), (gaddr), uint16_t)
 330 #define put_user_s16(x, gaddr) put_user((x), (gaddr), int16_t)
 331 #define put_user_u8(x, gaddr)  put_user((x), (gaddr), uint8_t)
 332 #define put_user_s8(x, gaddr)  put_user((x), (gaddr), int8_t)
 333
 334 #define get_user_ual(x, gaddr) get_user((x), (gaddr), abi_ulong)
 335 #define get_user_sal(x, gaddr) get_user((x), (gaddr), abi_long)
 336 #define get_user_u64(x, gaddr) get_user((x), (gaddr), uint64_t)
 337 #define get_user_s64(x, gaddr) get_user((x), (gaddr), int64_t)
 338 #define get_user_u32(x, gaddr) get_user((x), (gaddr), uint32_t)
 339 #define get_user_s32(x, gaddr) get_user((x), (gaddr), int32_t)
 340 #define get_user_u16(x, gaddr) get_user((x), (gaddr), uint16_t)
 341 #define get_user_s16(x, gaddr) get_user((x), (gaddr), int16_t)
 342 #define get_user_u8(x, gaddr)  get_user((x), (gaddr), uint8_t)
 343 #define get_user_s8(x, gaddr)  get_user((x), (gaddr), int8_t)
 344
 345 /* copy_from_user() and copy_to_user() are usually used to copy data
 346  * buffers between the target and host.  These internally perform
 347  * locking/unlocking of the memory.
 348  */
 349 abi_long copy_from_user(void *hptr, abi_ulong gaddr, size_t len);
 350 abi_long copy_to_user(abi_ulong gaddr, void *hptr, size_t len);
 351
 352 /* Functions for accessing guest memory.  The tget and tput functions
 353    read/write single values, byteswapping as necessary.  The lock_user function
 354    gets a pointer to a contiguous area of guest memory, but does not perform
 355    any byteswapping.  lock_user may return either a pointer to the guest
 356    memory, or a temporary buffer.  */
 357
 358 /* Lock an area of guest memory into the host.  If copy is true then the
 359    host area will have the same contents as the guest.  */
 360 static inline void *lock_user(int type, abi_ulong guest_addr, long len, int copy)
 361 {
 362     if (!access_ok(type, guest_addr, len))
 363         return NULL;
 364 #ifdef DEBUG_REMAP
 365     {
 366         void *addr;
 367         addr = malloc(len);
 368         if (copy)
 369             memcpy(addr, g2h(guest_addr), len);
 370         else
 371             memset(addr, 0, len);
 372         return addr;
 373     }
 374 #else
 375     return g2h(guest_addr);
 376 #endif
 377 }
 378
 379 /* Unlock an area of guest memory.  The first LEN bytes must be
 380    flushed back to guest memory. host_ptr = NULL is explicitly
 381    allowed and does nothing. */
 382 static inline void unlock_user(void *host_ptr, abi_ulong guest_addr,
 383                                long len)
 384 {
 385
 386 #ifdef DEBUG_REMAP
 387     if (!host_ptr)
 388         return;
 389     if (host_ptr == g2h(guest_addr))
 390         return;
 391     if (len > 0)
 392         memcpy(g2h(guest_addr), host_ptr, len);
 393     free(host_ptr);
 394 #endif
 395 }
 396
 397 /* Return the length of a string in target memory or -TARGET_EFAULT if
 398    access error. */
 399 abi_long target_strlen(abi_ulong gaddr);
 400
 401 /* Like lock_user but for null terminated strings.  */
 402 static inline void *lock_user_string(abi_ulong guest_addr)
 403 {
 404     abi_long len;
 405     len = target_strlen(guest_addr);
 406     if (len < 0)
 407         return NULL;
 408     return lock_user(VERIFY_READ, guest_addr, (long)(len + 1), 1);
 409 }
 410
 411 /* Helper macros for locking/unlocking a target struct.  */
 412 #define lock_user_struct(type, host_ptr, guest_addr, copy)      \
 413     (host_ptr = lock_user(type, guest_addr, sizeof(*host_ptr), copy))
 414 #define unlock_user_struct(host_ptr, guest_addr, copy)          \
 415     unlock_user(host_ptr, guest_addr, (copy) ? sizeof(*host_ptr) : 0)
 416
 417 #if defined(CONFIG_USE_NPTL)
 418 #include <pthread.h>
 419 #endif
 420
 421 #endif /* QEMU_H */