bsd-user/syscall.c

   1 /*
   2  *  BSD syscalls
   3  *
   4  *  Copyright (c) 2003 - 2008 Fabrice Bellard
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19 #include <stdlib.h>
  20 #include <stdio.h>
  21 #include <stdint.h>
  22 #include <stdarg.h>
  23 #include <string.h>
  24 #include <errno.h>
  25 #include <unistd.h>
  26 #include <fcntl.h>
  27 #include <time.h>
  28 #include <limits.h>
  29 #include <sys/types.h>
  30 #include <sys/mman.h>
  31 #include <sys/syscall.h>
  32 #include <sys/param.h>
  33 #include <sys/sysctl.h>
  34 #include <utime.h>
  35
  36 #include "qemu.h"
  37 #include "qemu-common.h"
  38
  39 //#define DEBUG
  40
  41 static abi_ulong target_brk;
  42 static abi_ulong target_original_brk;
  43
  44 static inline abi_long get_errno(abi_long ret)
  45 {
  46     if (ret == -1)
  47         /* XXX need to translate host -> target errnos here */
  48         return -(errno);
  49     else
  50         return ret;
  51 }
  52
  53 #define target_to_host_bitmask(x, tbl) (x)
  54
  55 static inline int is_error(abi_long ret)
  56 {
  57     return (abi_ulong)ret >= (abi_ulong)(-4096);
  58 }
  59
  60 void target_set_brk(abi_ulong new_brk)
  61 {
  62     target_original_brk = target_brk = HOST_PAGE_ALIGN(new_brk);
  63 }
  64
  65 /* do_obreak() must return target errnos. */
  66 static abi_long do_obreak(abi_ulong new_brk)
  67 {
  68     abi_ulong brk_page;
  69     abi_long mapped_addr;
  70     int new_alloc_size;
  71
  72     if (!new_brk)
  73         return 0;
  74     if (new_brk < target_original_brk)
  75         return -TARGET_EINVAL;
  76
  77     brk_page = HOST_PAGE_ALIGN(target_brk);
  78
  79     /* If the new brk is less than this, set it and we're done... */
  80     if (new_brk < brk_page) {
  81         target_brk = new_brk;
  82         return 0;
  83     }
  84
  85     /* We need to allocate more memory after the brk... */
  86     new_alloc_size = HOST_PAGE_ALIGN(new_brk - brk_page + 1);
  87     mapped_addr = get_errno(target_mmap(brk_page, new_alloc_size,
  88                                         PROT_READ|PROT_WRITE,
  89                                         MAP_ANON|MAP_FIXED|MAP_PRIVATE, -1, 0));
  90
  91     if (!is_error(mapped_addr))
  92         target_brk = new_brk;
  93     else
  94         return mapped_addr;
  95
  96     return 0;
  97 }
  98
  99 #if defined(TARGET_I386)
 100 static abi_long do_freebsd_sysarch(CPUX86State *env, int op, abi_ulong parms)
 101 {
 102     abi_long ret = 0;
 103     abi_ulong val;
 104     int idx;
 105
 106     switch(op) {
 107 #ifdef TARGET_ABI32
 108     case TARGET_FREEBSD_I386_SET_GSBASE:
 109     case TARGET_FREEBSD_I386_SET_FSBASE:
 110         if (op == TARGET_FREEBSD_I386_SET_GSBASE)
 111 #else
 112     case TARGET_FREEBSD_AMD64_SET_GSBASE:
 113     case TARGET_FREEBSD_AMD64_SET_FSBASE:
 114         if (op == TARGET_FREEBSD_AMD64_SET_GSBASE)
 115 #endif
 116             idx = R_GS;
 117         else
 118             idx = R_FS;
 119         if (get_user(val, parms, abi_ulong))
 120             return -TARGET_EFAULT;
 121         cpu_x86_load_seg(env, idx, 0);
 122         env->segs[idx].base = val;
 123         break;
 124 #ifdef TARGET_ABI32
 125     case TARGET_FREEBSD_I386_GET_GSBASE:
 126     case TARGET_FREEBSD_I386_GET_FSBASE:
 127         if (op == TARGET_FREEBSD_I386_GET_GSBASE)
 128 #else
 129     case TARGET_FREEBSD_AMD64_GET_GSBASE:
 130     case TARGET_FREEBSD_AMD64_GET_FSBASE:
 131         if (op == TARGET_FREEBSD_AMD64_GET_GSBASE)
 132 #endif
 133             idx = R_GS;
 134         else
 135             idx = R_FS;
 136         val = env->segs[idx].base;
 137         if (put_user(val, parms, abi_ulong))
 138             return -TARGET_EFAULT;
 139         break;
 140     /* XXX handle the others... */
 141     default:
 142         ret = -TARGET_EINVAL;
 143         break;
 144     }
 145     return ret;
 146 }
 147 #endif
 148
 149 #ifdef TARGET_SPARC
 150 static abi_long do_freebsd_sysarch(void *env, int op, abi_ulong parms)
 151 {
 152     /* XXX handle
 153      * TARGET_FREEBSD_SPARC_UTRAP_INSTALL,
 154      * TARGET_FREEBSD_SPARC_SIGTRAMP_INSTALL
 155      */
 156     return -TARGET_EINVAL;
 157 }
 158 #endif
 159
 160 #ifdef __FreeBSD__
 161 /*
 162  * XXX this uses the undocumented oidfmt interface to find the kind of
 163  * a requested sysctl, see /sys/kern/kern_sysctl.c:sysctl_sysctl_oidfmt()
 164  * (this is mostly copied from src/sbin/sysctl/sysctl.c)
 165  */
 166 static int
 167 oidfmt(int *oid, int len, char *fmt, uint32_t *kind)
 168 {
 169     int qoid[CTL_MAXNAME+2];
 170     uint8_t buf[BUFSIZ];
 171     int i;
 172     size_t j;
 173
 174     qoid[0] = 0;
 175     qoid[1] = 4;
 176     memcpy(qoid + 2, oid, len * sizeof(int));
 177
 178     j = sizeof(buf);
 179     i = sysctl(qoid, len + 2, buf, &j, 0, 0);
 180     if (i)
 181         return i;
 182
 183     if (kind)
 184         *kind = *(uint32_t *)buf;
 185
 186     if (fmt)
 187         strcpy(fmt, (char *)(buf + sizeof(uint32_t)));
 188     return (0);
 189 }
 190
 191 /*
 192  * try and convert sysctl return data for the target.
 193  * XXX doesn't handle CTLTYPE_OPAQUE and CTLTYPE_STRUCT.
 194  */
 195 static int sysctl_oldcvt(void *holdp, size_t holdlen, uint32_t kind)
 196 {
 197     switch (kind & CTLTYPE) {
 198     case CTLTYPE_INT:
 199     case CTLTYPE_UINT:
 200         *(uint32_t *)holdp = tswap32(*(uint32_t *)holdp);
 201         break;
 202 #ifdef TARGET_ABI32
 203     case CTLTYPE_LONG:
 204     case CTLTYPE_ULONG:
 205         *(uint32_t *)holdp = tswap32(*(long *)holdp);
 206         break;
 207 #else
 208     case CTLTYPE_LONG:
 209         *(uint64_t *)holdp = tswap64(*(long *)holdp);
 210     case CTLTYPE_ULONG:
 211         *(uint64_t *)holdp = tswap64(*(unsigned long *)holdp);
 212         break;
 213 #endif
 214 #ifdef CTLTYPE_U64
 215     case CTLTYPE_S64:
 216     case CTLTYPE_U64:
 217 #else
 218     case CTLTYPE_QUAD:
 219 #endif
 220         *(uint64_t *)holdp = tswap64(*(uint64_t *)holdp);
 221         break;
 222     case CTLTYPE_STRING:
 223         break;
 224     default:
 225         /* XXX unhandled */
 226         return -1;
 227     }
 228     return 0;
 229 }
 230
 231 /* XXX this needs to be emulated on non-FreeBSD hosts... */
 232 static abi_long do_freebsd_sysctl(abi_ulong namep, int32_t namelen, abi_ulong oldp,
 233                           abi_ulong oldlenp, abi_ulong newp, abi_ulong newlen)
 234 {
 235     abi_long ret;
 236     void *hnamep, *holdp, *hnewp = NULL;
 237     size_t holdlen;
 238     abi_ulong oldlen = 0;
 239     int32_t *snamep = g_malloc(sizeof(int32_t) * namelen), *p, *q, i;
 240     uint32_t kind = 0;
 241
 242     if (oldlenp)
 243         get_user_ual(oldlen, oldlenp);
 244     if (!(hnamep = lock_user(VERIFY_READ, namep, namelen, 1)))
 245         return -TARGET_EFAULT;
 246     if (newp && !(hnewp = lock_user(VERIFY_READ, newp, newlen, 1)))
 247         return -TARGET_EFAULT;
 248     if (!(holdp = lock_user(VERIFY_WRITE, oldp, oldlen, 0)))
 249         return -TARGET_EFAULT;
 250     holdlen = oldlen;
 251     for (p = hnamep, q = snamep, i = 0; i < namelen; p++, i++)
 252        *q++ = tswap32(*p);
 253     oidfmt(snamep, namelen, NULL, &kind);
 254     /* XXX swap hnewp */
 255     ret = get_errno(sysctl(snamep, namelen, holdp, &holdlen, hnewp, newlen));
 256     if (!ret)
 257         sysctl_oldcvt(holdp, holdlen, kind);
 258     put_user_ual(holdlen, oldlenp);
 259     unlock_user(hnamep, namep, 0);
 260     unlock_user(holdp, oldp, holdlen);
 261     if (hnewp)
 262         unlock_user(hnewp, newp, 0);
 263     g_free(snamep);
 264     return ret;
 265 }
 266 #endif
 267
 268 /* FIXME
 269  * lock_iovec()/unlock_iovec() have a return code of 0 for success where
 270  * other lock functions have a return code of 0 for failure.
 271  */
 272 static abi_long lock_iovec(int type, struct iovec *vec, abi_ulong target_addr,
 273                            int count, int copy)
 274 {
 275     struct target_iovec *target_vec;
 276     abi_ulong base;
 277     int i;
 278
 279     target_vec = lock_user(VERIFY_READ, target_addr, count * sizeof(struct target_iovec), 1);
 280     if (!target_vec)
 281         return -TARGET_EFAULT;
 282     for(i = 0;i < count; i++) {
 283         base = tswapl(target_vec[i].iov_base);
 284         vec[i].iov_len = tswapl(target_vec[i].iov_len);
 285         if (vec[i].iov_len != 0) {
 286             vec[i].iov_base = lock_user(type, base, vec[i].iov_len, copy);
 287             /* Don't check lock_user return value. We must call writev even
 288                if a element has invalid base address. */
 289         } else {
 290             /* zero length pointer is ignored */
 291             vec[i].iov_base = NULL;
 292         }
 293     }
 294     unlock_user (target_vec, target_addr, 0);
 295     return 0;
 296 }
 297
 298 static abi_long unlock_iovec(struct iovec *vec, abi_ulong target_addr,
 299                              int count, int copy)
 300 {
 301     struct target_iovec *target_vec;
 302     abi_ulong base;
 303     int i;
 304
 305     target_vec = lock_user(VERIFY_READ, target_addr, count * sizeof(struct target_iovec), 1);
 306     if (!target_vec)
 307         return -TARGET_EFAULT;
 308     for(i = 0;i < count; i++) {
 309         if (target_vec[i].iov_base) {
 310             base = tswapl(target_vec[i].iov_base);
 311             unlock_user(vec[i].iov_base, base, copy ? vec[i].iov_len : 0);
 312         }
 313     }
 314     unlock_user (target_vec, target_addr, 0);
 315
 316     return 0;
 317 }
 318
 319 /* do_syscall() should always have a single exit point at the end so
 320    that actions, such as logging of syscall results, can be performed.
 321    All errnos that do_syscall() returns must be -TARGET_<errcode>. */
 322 abi_long do_freebsd_syscall(void *cpu_env, int num, abi_long arg1,
 323                             abi_long arg2, abi_long arg3, abi_long arg4,
 324                             abi_long arg5, abi_long arg6, abi_long arg7,
 325                             abi_long arg8)
 326 {
 327     abi_long ret;
 328     void *p;
 329
 330 #ifdef DEBUG
 331     gemu_log("freebsd syscall %d\n", num);
 332 #endif
 333     if(do_strace)
 334         print_freebsd_syscall(num, arg1, arg2, arg3, arg4, arg5, arg6);
 335
 336     switch(num) {
 337     case TARGET_FREEBSD_NR_exit:
 338 #ifdef TARGET_GPROF
 339         _mcleanup();
 340 #endif
 341         gdb_exit(cpu_env, arg1);
 342         /* XXX: should free thread stack and CPU env */
 343         _exit(arg1);
 344         ret = 0; /* avoid warning */
 345         break;
 346     case TARGET_FREEBSD_NR_read:
 347         if (!(p = lock_user(VERIFY_WRITE, arg2, arg3, 0)))
 348             goto efault;
 349         ret = get_errno(read(arg1, p, arg3));
 350         unlock_user(p, arg2, ret);
 351         break;
 352     case TARGET_FREEBSD_NR_write:
 353         if (!(p = lock_user(VERIFY_READ, arg2, arg3, 1)))
 354             goto efault;
 355         ret = get_errno(write(arg1, p, arg3));
 356         unlock_user(p, arg2, 0);
 357         break;
 358     case TARGET_FREEBSD_NR_writev:
 359         {
 360             int count = arg3;
 361             struct iovec *vec;
 362
 363             vec = alloca(count * sizeof(struct iovec));
 364             if (lock_iovec(VERIFY_READ, vec, arg2, count, 1) < 0)
 365                 goto efault;
 366             ret = get_errno(writev(arg1, vec, count));
 367             unlock_iovec(vec, arg2, count, 0);
 368         }
 369         break;
 370     case TARGET_FREEBSD_NR_open:
 371         if (!(p = lock_user_string(arg1)))
 372             goto efault;
 373         ret = get_errno(open(path(p),
 374                              target_to_host_bitmask(arg2, fcntl_flags_tbl),
 375                              arg3));
 376         unlock_user(p, arg1, 0);
 377         break;
 378     case TARGET_FREEBSD_NR_mmap:
 379         ret = get_errno(target_mmap(arg1, arg2, arg3,
 380                                     target_to_host_bitmask(arg4, mmap_flags_tbl),
 381                                     arg5,
 382                                     arg6));
 383         break;
 384     case TARGET_FREEBSD_NR_mprotect:
 385         ret = get_errno(target_mprotect(arg1, arg2, arg3));
 386         break;
 387     case TARGET_FREEBSD_NR_break:
 388         ret = do_obreak(arg1);
 389         break;
 390 #ifdef __FreeBSD__
 391     case TARGET_FREEBSD_NR___sysctl:
 392         ret = do_freebsd_sysctl(arg1, arg2, arg3, arg4, arg5, arg6);
 393         break;
 394 #endif
 395     case TARGET_FREEBSD_NR_sysarch:
 396         ret = do_freebsd_sysarch(cpu_env, arg1, arg2);
 397         break;
 398     case TARGET_FREEBSD_NR_syscall:
 399     case TARGET_FREEBSD_NR___syscall:
 400         ret = do_freebsd_syscall(cpu_env,arg1 & 0xffff,arg2,arg3,arg4,arg5,arg6,arg7,arg8,0);
 401         break;
 402     default:
 403         ret = get_errno(syscall(num, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8));
 404         break;
 405     }
 406  fail:
 407 #ifdef DEBUG
 408     gemu_log(" = %ld\n", ret);
 409 #endif
 410     if (do_strace)
 411         print_freebsd_syscall_ret(num, ret);
 412     return ret;
 413  efault:
 414     ret = -TARGET_EFAULT;
 415     goto fail;
 416 }
 417
 418 abi_long do_netbsd_syscall(void *cpu_env, int num, abi_long arg1,
 419                            abi_long arg2, abi_long arg3, abi_long arg4,
 420                            abi_long arg5, abi_long arg6)
 421 {
 422     abi_long ret;
 423     void *p;
 424
 425 #ifdef DEBUG
 426     gemu_log("netbsd syscall %d\n", num);
 427 #endif
 428     if(do_strace)
 429         print_netbsd_syscall(num, arg1, arg2, arg3, arg4, arg5, arg6);
 430
 431     switch(num) {
 432     case TARGET_NETBSD_NR_exit:
 433 #ifdef TARGET_GPROF
 434         _mcleanup();
 435 #endif
 436         gdb_exit(cpu_env, arg1);
 437         /* XXX: should free thread stack and CPU env */
 438         _exit(arg1);
 439         ret = 0; /* avoid warning */
 440         break;
 441     case TARGET_NETBSD_NR_read:
 442         if (!(p = lock_user(VERIFY_WRITE, arg2, arg3, 0)))
 443             goto efault;
 444         ret = get_errno(read(arg1, p, arg3));
 445         unlock_user(p, arg2, ret);
 446         break;
 447     case TARGET_NETBSD_NR_write:
 448         if (!(p = lock_user(VERIFY_READ, arg2, arg3, 1)))
 449             goto efault;
 450         ret = get_errno(write(arg1, p, arg3));
 451         unlock_user(p, arg2, 0);
 452         break;
 453     case TARGET_NETBSD_NR_open:
 454         if (!(p = lock_user_string(arg1)))
 455             goto efault;
 456         ret = get_errno(open(path(p),
 457                              target_to_host_bitmask(arg2, fcntl_flags_tbl),
 458                              arg3));
 459         unlock_user(p, arg1, 0);
 460         break;
 461     case TARGET_NETBSD_NR_mmap:
 462         ret = get_errno(target_mmap(arg1, arg2, arg3,
 463                                     target_to_host_bitmask(arg4, mmap_flags_tbl),
 464                                     arg5,
 465                                     arg6));
 466         break;
 467     case TARGET_NETBSD_NR_mprotect:
 468         ret = get_errno(target_mprotect(arg1, arg2, arg3));
 469         break;
 470     case TARGET_NETBSD_NR_syscall:
 471     case TARGET_NETBSD_NR___syscall:
 472         ret = do_netbsd_syscall(cpu_env,arg1 & 0xffff,arg2,arg3,arg4,arg5,arg6,0);
 473         break;
 474     default:
 475         ret = syscall(num, arg1, arg2, arg3, arg4, arg5, arg6);
 476         break;
 477     }
 478  fail:
 479 #ifdef DEBUG
 480     gemu_log(" = %ld\n", ret);
 481 #endif
 482     if (do_strace)
 483         print_netbsd_syscall_ret(num, ret);
 484     return ret;
 485  efault:
 486     ret = -TARGET_EFAULT;
 487     goto fail;
 488 }
 489
 490 abi_long do_openbsd_syscall(void *cpu_env, int num, abi_long arg1,
 491                             abi_long arg2, abi_long arg3, abi_long arg4,
 492                             abi_long arg5, abi_long arg6)
 493 {
 494     abi_long ret;
 495     void *p;
 496
 497 #ifdef DEBUG
 498     gemu_log("openbsd syscall %d\n", num);
 499 #endif
 500     if(do_strace)
 501         print_openbsd_syscall(num, arg1, arg2, arg3, arg4, arg5, arg6);
 502
 503     switch(num) {
 504     case TARGET_OPENBSD_NR_exit:
 505 #ifdef TARGET_GPROF
 506         _mcleanup();
 507 #endif
 508         gdb_exit(cpu_env, arg1);
 509         /* XXX: should free thread stack and CPU env */
 510         _exit(arg1);
 511         ret = 0; /* avoid warning */
 512         break;
 513     case TARGET_OPENBSD_NR_read:
 514         if (!(p = lock_user(VERIFY_WRITE, arg2, arg3, 0)))
 515             goto efault;
 516         ret = get_errno(read(arg1, p, arg3));
 517         unlock_user(p, arg2, ret);
 518         break;
 519     case TARGET_OPENBSD_NR_write:
 520         if (!(p = lock_user(VERIFY_READ, arg2, arg3, 1)))
 521             goto efault;
 522         ret = get_errno(write(arg1, p, arg3));
 523         unlock_user(p, arg2, 0);
 524         break;
 525     case TARGET_OPENBSD_NR_open:
 526         if (!(p = lock_user_string(arg1)))
 527             goto efault;
 528         ret = get_errno(open(path(p),
 529                              target_to_host_bitmask(arg2, fcntl_flags_tbl),
 530                              arg3));
 531         unlock_user(p, arg1, 0);
 532         break;
 533     case TARGET_OPENBSD_NR_mmap:
 534         ret = get_errno(target_mmap(arg1, arg2, arg3,
 535                                     target_to_host_bitmask(arg4, mmap_flags_tbl),
 536                                     arg5,
 537                                     arg6));
 538         break;
 539     case TARGET_OPENBSD_NR_mprotect:
 540         ret = get_errno(target_mprotect(arg1, arg2, arg3));
 541         break;
 542     case TARGET_OPENBSD_NR_syscall:
 543     case TARGET_OPENBSD_NR___syscall:
 544         ret = do_openbsd_syscall(cpu_env,arg1 & 0xffff,arg2,arg3,arg4,arg5,arg6,0);
 545         break;
 546     default:
 547         ret = syscall(num, arg1, arg2, arg3, arg4, arg5, arg6);
 548         break;
 549     }
 550  fail:
 551 #ifdef DEBUG
 552     gemu_log(" = %ld\n", ret);
 553 #endif
 554     if (do_strace)
 555         print_openbsd_syscall_ret(num, ret);
 556     return ret;
 557  efault:
 558     ret = -TARGET_EFAULT;
 559     goto fail;
 560 }
 561
 562 void syscall_init(void)
 563 {
 564 }