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