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/exec-all.h"
  23 #include "exec/cpu_ldst.h"
  24
  25 #undef DEBUG_REMAP
  26 #ifdef DEBUG_REMAP
  27 #endif /* DEBUG_REMAP */
  28
  29 #include "exec/user/abitypes.h"
  30
  31 enum BSDType {
  32     target_freebsd,
  33     target_netbsd,
  34     target_openbsd,
  35 };
  36 extern enum BSDType bsd_type;
  37
  38 #include "syscall_defs.h"
  39 #include "target_syscall.h"
  40 #include "target_signal.h"
  41 #include "exec/gdbstub.h"
  42
  43 #if defined(CONFIG_USE_NPTL)
  44 #define THREAD __thread
  45 #else
  46 #define THREAD
  47 #endif
  48
  49 /* This struct is used to hold certain information about the image.
  50  * Basically, it replicates in user space what would be certain
  51  * task_struct fields in the kernel
  52  */
  53 struct image_info {
  54     abi_ulong load_addr;
  55     abi_ulong start_code;
  56     abi_ulong end_code;
  57     abi_ulong start_data;
  58     abi_ulong end_data;
  59     abi_ulong start_brk;
  60     abi_ulong brk;
  61     abi_ulong start_mmap;
  62     abi_ulong mmap;
  63     abi_ulong rss;
  64     abi_ulong start_stack;
  65     abi_ulong entry;
  66     abi_ulong code_offset;
  67     abi_ulong data_offset;
  68     int       personality;
  69 };
  70
  71 #define MAX_SIGQUEUE_SIZE 1024
  72
  73 struct sigqueue {
  74     struct sigqueue *next;
  75     //target_siginfo_t info;
  76 };
  77
  78 struct emulated_sigtable {
  79     int pending; /* true if signal is pending */
  80     struct sigqueue *first;
  81     struct sigqueue info; /* in order to always have memory for the
  82                              first signal, we put it here */
  83 };
  84
  85 /* NOTE: we force a big alignment so that the stack stored after is
  86    aligned too */
  87 typedef struct TaskState {
  88     struct TaskState *next;
  89     int used; /* non zero if used */
  90     struct image_info *info;
  91
  92     struct emulated_sigtable sigtab[TARGET_NSIG];
  93     struct sigqueue sigqueue_table[MAX_SIGQUEUE_SIZE]; /* siginfo queue */
  94     struct sigqueue *first_free; /* first free siginfo queue entry */
  95     int signal_pending; /* non zero if a signal may be pending */
  96
  97     uint8_t stack[0];
  98 } __attribute__((aligned(16))) TaskState;
  99
 100 void init_task_state(TaskState *ts);
 101 extern const char *qemu_uname_release;
 102 extern unsigned long mmap_min_addr;
 103
 104 /* ??? See if we can avoid exposing so much of the loader internals.  */
 105 /*
 106  * MAX_ARG_PAGES defines the number of pages allocated for arguments
 107  * and envelope for the new program. 32 should suffice, this gives
 108  * a maximum env+arg of 128kB w/4KB pages!
 109  */
 110 #define MAX_ARG_PAGES 32
 111
 112 /*
 113  * This structure is used to hold the arguments that are
 114  * used when loading binaries.
 115  */
 116 struct linux_binprm {
 117         char buf[128];
 118         void *page[MAX_ARG_PAGES];
 119         abi_ulong p;
 120         int fd;
 121         int e_uid, e_gid;
 122         int argc, envc;
 123         char **argv;
 124         char **envp;
 125         char * filename;        /* Name of binary */
 126 };
 127
 128 void do_init_thread(struct target_pt_regs *regs, struct image_info *infop);
 129 abi_ulong loader_build_argptr(int envc, int argc, abi_ulong sp,
 130                               abi_ulong stringp, int push_ptr);
 131 int loader_exec(const char * filename, char ** argv, char ** envp,
 132              struct target_pt_regs * regs, struct image_info *infop);
 133
 134 int load_elf_binary(struct linux_binprm * bprm, struct target_pt_regs * regs,
 135                     struct image_info * info);
 136 int load_flt_binary(struct linux_binprm * bprm, struct target_pt_regs * regs,
 137                     struct image_info * info);
 138
 139 abi_long memcpy_to_target(abi_ulong dest, const void *src,
 140                           unsigned long len);
 141 void target_set_brk(abi_ulong new_brk);
 142 abi_long do_brk(abi_ulong new_brk);
 143 void syscall_init(void);
 144 abi_long do_freebsd_syscall(void *cpu_env, int num, abi_long arg1,
 145                             abi_long arg2, abi_long arg3, abi_long arg4,
 146                             abi_long arg5, abi_long arg6, abi_long arg7,
 147                             abi_long arg8);
 148 abi_long do_netbsd_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);
 151 abi_long do_openbsd_syscall(void *cpu_env, int num, abi_long arg1,
 152                             abi_long arg2, abi_long arg3, abi_long arg4,
 153                             abi_long arg5, abi_long arg6);
 154 void gemu_log(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
 155 extern THREAD CPUState *thread_cpu;
 156 void cpu_loop(CPUArchState *env);
 157 char *target_strerror(int err);
 158 int get_osversion(void);
 159 void fork_start(void);
 160 void fork_end(int child);
 161
 162 #include "qemu/log.h"
 163
 164 /* strace.c */
 165 struct syscallname {
 166     int nr;
 167     const char *name;
 168     const char *format;
 169     void (*call)(const struct syscallname *,
 170                  abi_long, abi_long, abi_long,
 171                  abi_long, abi_long, abi_long);
 172     void (*result)(const struct syscallname *, abi_long);
 173 };
 174
 175 void
 176 print_freebsd_syscall(int num,
 177                       abi_long arg1, abi_long arg2, abi_long arg3,
 178                       abi_long arg4, abi_long arg5, abi_long arg6);
 179 void print_freebsd_syscall_ret(int num, abi_long ret);
 180 void
 181 print_netbsd_syscall(int num,
 182                      abi_long arg1, abi_long arg2, abi_long arg3,
 183                      abi_long arg4, abi_long arg5, abi_long arg6);
 184 void print_netbsd_syscall_ret(int num, abi_long ret);
 185 void
 186 print_openbsd_syscall(int num,
 187                       abi_long arg1, abi_long arg2, abi_long arg3,
 188                       abi_long arg4, abi_long arg5, abi_long arg6);
 189 void print_openbsd_syscall_ret(int num, abi_long ret);
 190 extern int do_strace;
 191
 192 /* signal.c */
 193 void process_pending_signals(CPUArchState *cpu_env);
 194 void signal_init(void);
 195 //int queue_signal(CPUArchState *env, int sig, target_siginfo_t *info);
 196 //void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info);
 197 //void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo);
 198 long do_sigreturn(CPUArchState *env);
 199 long do_rt_sigreturn(CPUArchState *env);
 200 abi_long do_sigaltstack(abi_ulong uss_addr, abi_ulong uoss_addr, abi_ulong sp);
 201
 202 /* mmap.c */
 203 int target_mprotect(abi_ulong start, abi_ulong len, int prot);
 204 abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
 205                      int flags, int fd, abi_ulong offset);
 206 int target_munmap(abi_ulong start, abi_ulong len);
 207 abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,
 208                        abi_ulong new_size, unsigned long flags,
 209                        abi_ulong new_addr);
 210 int target_msync(abi_ulong start, abi_ulong len, int flags);
 211 extern unsigned long last_brk;
 212 void cpu_list_lock(void);
 213 void cpu_list_unlock(void);
 214 #if defined(CONFIG_USE_NPTL)
 215 void mmap_fork_start(void);
 216 void mmap_fork_end(int child);
 217 #endif
 218
 219 /* main.c */
 220 extern unsigned long x86_stack_size;
 221
 222 /* user access */
 223
 224 #define VERIFY_READ 0
 225 #define VERIFY_WRITE 1 /* implies read access */
 226
 227 static inline int access_ok(int type, abi_ulong addr, abi_ulong size)
 228 {
 229     return page_check_range((target_ulong)addr, size,
 230                             (type == VERIFY_READ) ? PAGE_READ : (PAGE_READ | PAGE_WRITE)) == 0;
 231 }
 232
 233 /* NOTE __get_user and __put_user use host pointers and don't check access. */
 234 /* These are usually used to access struct data members once the
 235  * struct has been locked - usually with lock_user_struct().
 236  */
 237 #define __put_user(x, hptr)\
 238 ({\
 239     int size = sizeof(*hptr);\
 240     switch(size) {\
 241     case 1:\
 242         *(uint8_t *)(hptr) = (uint8_t)(typeof(*hptr))(x);\
 243         break;\
 244     case 2:\
 245         *(uint16_t *)(hptr) = tswap16((typeof(*hptr))(x));\
 246         break;\
 247     case 4:\
 248         *(uint32_t *)(hptr) = tswap32((typeof(*hptr))(x));\
 249         break;\
 250     case 8:\
 251         *(uint64_t *)(hptr) = tswap64((typeof(*hptr))(x));\
 252         break;\
 253     default:\
 254         abort();\
 255     }\
 256     0;\
 257 })
 258
 259 #define __get_user(x, hptr) \
 260 ({\
 261     int size = sizeof(*hptr);\
 262     switch(size) {\
 263     case 1:\
 264         x = (typeof(*hptr))*(uint8_t *)(hptr);\
 265         break;\
 266     case 2:\
 267         x = (typeof(*hptr))tswap16(*(uint16_t *)(hptr));\
 268         break;\
 269     case 4:\
 270         x = (typeof(*hptr))tswap32(*(uint32_t *)(hptr));\
 271         break;\
 272     case 8:\
 273         x = (typeof(*hptr))tswap64(*(uint64_t *)(hptr));\
 274         break;\
 275     default:\
 276         /* avoid warning */\
 277         x = 0;\
 278         abort();\
 279     }\
 280     0;\
 281 })
 282
 283 /* put_user()/get_user() take a guest address and check access */
 284 /* These are usually used to access an atomic data type, such as an int,
 285  * that has been passed by address.  These internally perform locking
 286  * and unlocking on the data type.
 287  */
 288 #define put_user(x, gaddr, target_type)                                 \
 289 ({                                                                      \
 290     abi_ulong __gaddr = (gaddr);                                        \
 291     target_type *__hptr;                                                \
 292     abi_long __ret;                                                     \
 293     if ((__hptr = lock_user(VERIFY_WRITE, __gaddr, sizeof(target_type), 0))) { \
 294         __ret = __put_user((x), __hptr);                                \
 295         unlock_user(__hptr, __gaddr, sizeof(target_type));              \
 296     } else                                                              \
 297         __ret = -TARGET_EFAULT;                                         \
 298     __ret;                                                              \
 299 })
 300
 301 #define get_user(x, gaddr, target_type)                                 \
 302 ({                                                                      \
 303     abi_ulong __gaddr = (gaddr);                                        \
 304     target_type *__hptr;                                                \
 305     abi_long __ret;                                                     \
 306     if ((__hptr = lock_user(VERIFY_READ, __gaddr, sizeof(target_type), 1))) { \
 307         __ret = __get_user((x), __hptr);                                \
 308         unlock_user(__hptr, __gaddr, 0);                                \
 309     } else {                                                            \
 310         /* avoid warning */                                             \
 311         (x) = 0;                                                        \
 312         __ret = -TARGET_EFAULT;                                         \
 313     }                                                                   \
 314     __ret;                                                              \
 315 })
 316
 317 #define put_user_ual(x, gaddr) put_user((x), (gaddr), abi_ulong)
 318 #define put_user_sal(x, gaddr) put_user((x), (gaddr), abi_long)
 319 #define put_user_u64(x, gaddr) put_user((x), (gaddr), uint64_t)
 320 #define put_user_s64(x, gaddr) put_user((x), (gaddr), int64_t)
 321 #define put_user_u32(x, gaddr) put_user((x), (gaddr), uint32_t)
 322 #define put_user_s32(x, gaddr) put_user((x), (gaddr), int32_t)
 323 #define put_user_u16(x, gaddr) put_user((x), (gaddr), uint16_t)
 324 #define put_user_s16(x, gaddr) put_user((x), (gaddr), int16_t)
 325 #define put_user_u8(x, gaddr)  put_user((x), (gaddr), uint8_t)
 326 #define put_user_s8(x, gaddr)  put_user((x), (gaddr), int8_t)
 327
 328 #define get_user_ual(x, gaddr) get_user((x), (gaddr), abi_ulong)
 329 #define get_user_sal(x, gaddr) get_user((x), (gaddr), abi_long)
 330 #define get_user_u64(x, gaddr) get_user((x), (gaddr), uint64_t)
 331 #define get_user_s64(x, gaddr) get_user((x), (gaddr), int64_t)
 332 #define get_user_u32(x, gaddr) get_user((x), (gaddr), uint32_t)
 333 #define get_user_s32(x, gaddr) get_user((x), (gaddr), int32_t)
 334 #define get_user_u16(x, gaddr) get_user((x), (gaddr), uint16_t)
 335 #define get_user_s16(x, gaddr) get_user((x), (gaddr), int16_t)
 336 #define get_user_u8(x, gaddr)  get_user((x), (gaddr), uint8_t)
 337 #define get_user_s8(x, gaddr)  get_user((x), (gaddr), int8_t)
 338
 339 /* copy_from_user() and copy_to_user() are usually used to copy data
 340  * buffers between the target and host.  These internally perform
 341  * locking/unlocking of the memory.
 342  */
 343 abi_long copy_from_user(void *hptr, abi_ulong gaddr, size_t len);
 344 abi_long copy_to_user(abi_ulong gaddr, void *hptr, size_t len);
 345
 346 /* Functions for accessing guest memory.  The tget and tput functions
 347    read/write single values, byteswapping as necessary.  The lock_user function
 348    gets a pointer to a contiguous area of guest memory, but does not perform
 349    any byteswapping.  lock_user may return either a pointer to the guest
 350    memory, or a temporary buffer.  */
 351
 352 /* Lock an area of guest memory into the host.  If copy is true then the
 353    host area will have the same contents as the guest.  */
 354 static inline void *lock_user(int type, abi_ulong guest_addr, long len, int copy)
 355 {
 356     if (!access_ok(type, guest_addr, len))
 357         return NULL;
 358 #ifdef DEBUG_REMAP
 359     {
 360         void *addr;
 361         addr = malloc(len);
 362         if (copy)
 363             memcpy(addr, g2h(guest_addr), len);
 364         else
 365             memset(addr, 0, len);
 366         return addr;
 367     }
 368 #else
 369     return g2h(guest_addr);
 370 #endif
 371 }
 372
 373 /* Unlock an area of guest memory.  The first LEN bytes must be
 374    flushed back to guest memory. host_ptr = NULL is explicitly
 375    allowed and does nothing. */
 376 static inline void unlock_user(void *host_ptr, abi_ulong guest_addr,
 377                                long len)
 378 {
 379
 380 #ifdef DEBUG_REMAP
 381     if (!host_ptr)
 382         return;
 383     if (host_ptr == g2h(guest_addr))
 384         return;
 385     if (len > 0)
 386         memcpy(g2h(guest_addr), host_ptr, len);
 387     free(host_ptr);
 388 #endif
 389 }
 390
 391 /* Return the length of a string in target memory or -TARGET_EFAULT if
 392    access error. */
 393 abi_long target_strlen(abi_ulong gaddr);
 394
 395 /* Like lock_user but for null terminated strings.  */
 396 static inline void *lock_user_string(abi_ulong guest_addr)
 397 {
 398     abi_long len;
 399     len = target_strlen(guest_addr);
 400     if (len < 0)
 401         return NULL;
 402     return lock_user(VERIFY_READ, guest_addr, (long)(len + 1), 1);
 403 }
 404
 405 /* Helper macros for locking/unlocking a target struct.  */
 406 #define lock_user_struct(type, host_ptr, guest_addr, copy)      \
 407     (host_ptr = lock_user(type, guest_addr, sizeof(*host_ptr), copy))
 408 #define unlock_user_struct(host_ptr, guest_addr, copy)          \
 409     unlock_user(host_ptr, guest_addr, (copy) ? sizeof(*host_ptr) : 0)
 410
 411 #if defined(CONFIG_USE_NPTL)
 412 #include <pthread.h>
 413 #endif
 414
 415 #endif /* QEMU_H */