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     case CTLTYPE_QUAD:
 215         *(uint64_t *)holdp = tswap64(*(uint64_t *)holdp);
 216         break;
 217     case CTLTYPE_STRING:
 218         break;
 219     default:
 220         /* XXX unhandled */
 221         return -1;
 222     }
 223     return 0;
 224 }
 225
 226 /* XXX this needs to be emulated on non-FreeBSD hosts... */
 227 static abi_long do_freebsd_sysctl(abi_ulong namep, int32_t namelen, abi_ulong oldp,
 228                           abi_ulong oldlenp, abi_ulong newp, abi_ulong newlen)
 229 {
 230     abi_long ret;
 231     void *hnamep, *holdp, *hnewp = NULL;
 232     size_t holdlen;
 233     abi_ulong oldlen = 0;
 234     int32_t *snamep = qemu_malloc(sizeof(int32_t) * namelen), *p, *q, i;
 235     uint32_t kind = 0;
 236
 237     if (oldlenp)
 238         get_user_ual(oldlen, oldlenp);
 239     if (!(hnamep = lock_user(VERIFY_READ, namep, namelen, 1)))
 240         return -TARGET_EFAULT;
 241     if (newp && !(hnewp = lock_user(VERIFY_READ, newp, newlen, 1)))
 242         return -TARGET_EFAULT;
 243     if (!(holdp = lock_user(VERIFY_WRITE, oldp, oldlen, 0)))
 244         return -TARGET_EFAULT;
 245     holdlen = oldlen;
 246     for (p = hnamep, q = snamep, i = 0; i < namelen; p++, i++)
 247        *q++ = tswap32(*p);
 248     oidfmt(snamep, namelen, NULL, &kind);
 249     /* XXX swap hnewp */
 250     ret = get_errno(sysctl(snamep, namelen, holdp, &holdlen, hnewp, newlen));
 251     if (!ret)
 252         sysctl_oldcvt(holdp, holdlen, kind);
 253     put_user_ual(holdlen, oldlenp);
 254     unlock_user(hnamep, namep, 0);
 255     unlock_user(holdp, oldp, holdlen);
 256     if (hnewp)
 257         unlock_user(hnewp, newp, 0);
 258     qemu_free(snamep);
 259     return ret;
 260 }
 261 #endif
 262
 263 /* FIXME
 264  * lock_iovec()/unlock_iovec() have a return code of 0 for success where
 265  * other lock functions have a return code of 0 for failure.
 266  */
 267 static abi_long lock_iovec(int type, struct iovec *vec, abi_ulong target_addr,
 268                            int count, int copy)
 269 {
 270     struct target_iovec *target_vec;
 271     abi_ulong base;
 272     int i;
 273
 274     target_vec = lock_user(VERIFY_READ, target_addr, count * sizeof(struct target_iovec), 1);
 275     if (!target_vec)
 276         return -TARGET_EFAULT;
 277     for(i = 0;i < count; i++) {
 278         base = tswapl(target_vec[i].iov_base);
 279         vec[i].iov_len = tswapl(target_vec[i].iov_len);
 280         if (vec[i].iov_len != 0) {
 281             vec[i].iov_base = lock_user(type, base, vec[i].iov_len, copy);
 282             /* Don't check lock_user return value. We must call writev even
 283                if a element has invalid base address. */
 284         } else {
 285             /* zero length pointer is ignored */
 286             vec[i].iov_base = NULL;
 287         }
 288     }
 289     unlock_user (target_vec, target_addr, 0);
 290     return 0;
 291 }
 292
 293 static abi_long unlock_iovec(struct iovec *vec, abi_ulong target_addr,
 294                              int count, int copy)
 295 {
 296     struct target_iovec *target_vec;
 297     abi_ulong base;
 298     int i;
 299
 300     target_vec = lock_user(VERIFY_READ, target_addr, count * sizeof(struct target_iovec), 1);
 301     if (!target_vec)
 302         return -TARGET_EFAULT;
 303     for(i = 0;i < count; i++) {
 304         if (target_vec[i].iov_base) {
 305             base = tswapl(target_vec[i].iov_base);
 306             unlock_user(vec[i].iov_base, base, copy ? vec[i].iov_len : 0);
 307         }
 308     }
 309     unlock_user (target_vec, target_addr, 0);
 310
 311     return 0;
 312 }
 313
 314 /* do_syscall() should always have a single exit point at the end so
 315    that actions, such as logging of syscall results, can be performed.
 316    All errnos that do_syscall() returns must be -TARGET_<errcode>. */
 317 abi_long do_freebsd_syscall(void *cpu_env, int num, abi_long arg1,
 318                             abi_long arg2, abi_long arg3, abi_long arg4,
 319                             abi_long arg5, abi_long arg6, abi_long arg7,
 320                             abi_long arg8)
 321 {
 322     abi_long ret;
 323     void *p;
 324
 325 #ifdef DEBUG
 326     gemu_log("freebsd syscall %d\n", num);
 327 #endif
 328     if(do_strace)
 329         print_freebsd_syscall(num, arg1, arg2, arg3, arg4, arg5, arg6);
 330
 331     switch(num) {
 332     case TARGET_FREEBSD_NR_exit:
 333 #ifdef TARGET_GPROF
 334         _mcleanup();
 335 #endif
 336         gdb_exit(cpu_env, arg1);
 337         /* XXX: should free thread stack and CPU env */
 338         _exit(arg1);
 339         ret = 0; /* avoid warning */
 340         break;
 341     case TARGET_FREEBSD_NR_read:
 342         if (!(p = lock_user(VERIFY_WRITE, arg2, arg3, 0)))
 343             goto efault;
 344         ret = get_errno(read(arg1, p, arg3));
 345         unlock_user(p, arg2, ret);
 346         break;
 347     case TARGET_FREEBSD_NR_write:
 348         if (!(p = lock_user(VERIFY_READ, arg2, arg3, 1)))
 349             goto efault;
 350         ret = get_errno(write(arg1, p, arg3));
 351         unlock_user(p, arg2, 0);
 352         break;
 353     case TARGET_FREEBSD_NR_writev:
 354         {
 355             int count = arg3;
 356             struct iovec *vec;
 357
 358             vec = alloca(count * sizeof(struct iovec));
 359             if (lock_iovec(VERIFY_READ, vec, arg2, count, 1) < 0)
 360                 goto efault;
 361             ret = get_errno(writev(arg1, vec, count));
 362             unlock_iovec(vec, arg2, count, 0);
 363         }
 364         break;
 365     case TARGET_FREEBSD_NR_open:
 366         if (!(p = lock_user_string(arg1)))
 367             goto efault;
 368         ret = get_errno(open(path(p),
 369                              target_to_host_bitmask(arg2, fcntl_flags_tbl),
 370                              arg3));
 371         unlock_user(p, arg1, 0);
 372         break;
 373     case TARGET_FREEBSD_NR_mmap:
 374         ret = get_errno(target_mmap(arg1, arg2, arg3,
 375                                     target_to_host_bitmask(arg4, mmap_flags_tbl),
 376                                     arg5,
 377                                     arg6));
 378         break;
 379     case TARGET_FREEBSD_NR_mprotect:
 380         ret = get_errno(target_mprotect(arg1, arg2, arg3));
 381         break;
 382     case TARGET_FREEBSD_NR_break:
 383         ret = do_obreak(arg1);
 384         break;
 385 #ifdef __FreeBSD__
 386     case TARGET_FREEBSD_NR___sysctl:
 387         ret = do_freebsd_sysctl(arg1, arg2, arg3, arg4, arg5, arg6);
 388         break;
 389 #endif
 390     case TARGET_FREEBSD_NR_sysarch:
 391         ret = do_freebsd_sysarch(cpu_env, arg1, arg2);
 392         break;
 393     case TARGET_FREEBSD_NR_syscall:
 394     case TARGET_FREEBSD_NR___syscall:
 395         ret = do_freebsd_syscall(cpu_env,arg1 & 0xffff,arg2,arg3,arg4,arg5,arg6,arg7,arg8,0);
 396         break;
 397     default:
 398         ret = get_errno(syscall(num, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8));
 399         break;
 400     }
 401  fail:
 402 #ifdef DEBUG
 403     gemu_log(" = %ld\n", ret);
 404 #endif
 405     if (do_strace)
 406         print_freebsd_syscall_ret(num, ret);
 407     return ret;
 408  efault:
 409     ret = -TARGET_EFAULT;
 410     goto fail;
 411 }
 412
 413 abi_long do_netbsd_syscall(void *cpu_env, int num, abi_long arg1,
 414                            abi_long arg2, abi_long arg3, abi_long arg4,
 415                            abi_long arg5, abi_long arg6)
 416 {
 417     abi_long ret;
 418     void *p;
 419
 420 #ifdef DEBUG
 421     gemu_log("netbsd syscall %d\n", num);
 422 #endif
 423     if(do_strace)
 424         print_netbsd_syscall(num, arg1, arg2, arg3, arg4, arg5, arg6);
 425
 426     switch(num) {
 427     case TARGET_NETBSD_NR_exit:
 428 #ifdef TARGET_GPROF
 429         _mcleanup();
 430 #endif
 431         gdb_exit(cpu_env, arg1);
 432         /* XXX: should free thread stack and CPU env */
 433         _exit(arg1);
 434         ret = 0; /* avoid warning */
 435         break;
 436     case TARGET_NETBSD_NR_read:
 437         if (!(p = lock_user(VERIFY_WRITE, arg2, arg3, 0)))
 438             goto efault;
 439         ret = get_errno(read(arg1, p, arg3));
 440         unlock_user(p, arg2, ret);
 441         break;
 442     case TARGET_NETBSD_NR_write:
 443         if (!(p = lock_user(VERIFY_READ, arg2, arg3, 1)))
 444             goto efault;
 445         ret = get_errno(write(arg1, p, arg3));
 446         unlock_user(p, arg2, 0);
 447         break;
 448     case TARGET_NETBSD_NR_open:
 449         if (!(p = lock_user_string(arg1)))
 450             goto efault;
 451         ret = get_errno(open(path(p),
 452                              target_to_host_bitmask(arg2, fcntl_flags_tbl),
 453                              arg3));
 454         unlock_user(p, arg1, 0);
 455         break;
 456     case TARGET_NETBSD_NR_mmap:
 457         ret = get_errno(target_mmap(arg1, arg2, arg3,
 458                                     target_to_host_bitmask(arg4, mmap_flags_tbl),
 459                                     arg5,
 460                                     arg6));
 461         break;
 462     case TARGET_NETBSD_NR_mprotect:
 463         ret = get_errno(target_mprotect(arg1, arg2, arg3));
 464         break;
 465     case TARGET_NETBSD_NR_syscall:
 466     case TARGET_NETBSD_NR___syscall:
 467         ret = do_netbsd_syscall(cpu_env,arg1 & 0xffff,arg2,arg3,arg4,arg5,arg6,0);
 468         break;
 469     default:
 470         ret = syscall(num, arg1, arg2, arg3, arg4, arg5, arg6);
 471         break;
 472     }
 473  fail:
 474 #ifdef DEBUG
 475     gemu_log(" = %ld\n", ret);
 476 #endif
 477     if (do_strace)
 478         print_netbsd_syscall_ret(num, ret);
 479     return ret;
 480  efault:
 481     ret = -TARGET_EFAULT;
 482     goto fail;
 483 }
 484
 485 abi_long do_openbsd_syscall(void *cpu_env, int num, abi_long arg1,
 486                             abi_long arg2, abi_long arg3, abi_long arg4,
 487                             abi_long arg5, abi_long arg6)
 488 {
 489     abi_long ret;
 490     void *p;
 491
 492 #ifdef DEBUG
 493     gemu_log("openbsd syscall %d\n", num);
 494 #endif
 495     if(do_strace)
 496         print_openbsd_syscall(num, arg1, arg2, arg3, arg4, arg5, arg6);
 497
 498     switch(num) {
 499     case TARGET_OPENBSD_NR_exit:
 500 #ifdef TARGET_GPROF
 501         _mcleanup();
 502 #endif
 503         gdb_exit(cpu_env, arg1);
 504         /* XXX: should free thread stack and CPU env */
 505         _exit(arg1);
 506         ret = 0; /* avoid warning */
 507         break;
 508     case TARGET_OPENBSD_NR_read:
 509         if (!(p = lock_user(VERIFY_WRITE, arg2, arg3, 0)))
 510             goto efault;
 511         ret = get_errno(read(arg1, p, arg3));
 512         unlock_user(p, arg2, ret);
 513         break;
 514     case TARGET_OPENBSD_NR_write:
 515         if (!(p = lock_user(VERIFY_READ, arg2, arg3, 1)))
 516             goto efault;
 517         ret = get_errno(write(arg1, p, arg3));
 518         unlock_user(p, arg2, 0);
 519         break;
 520     case TARGET_OPENBSD_NR_open:
 521         if (!(p = lock_user_string(arg1)))
 522             goto efault;
 523         ret = get_errno(open(path(p),
 524                              target_to_host_bitmask(arg2, fcntl_flags_tbl),
 525                              arg3));
 526         unlock_user(p, arg1, 0);
 527         break;
 528     case TARGET_OPENBSD_NR_mmap:
 529         ret = get_errno(target_mmap(arg1, arg2, arg3,
 530                                     target_to_host_bitmask(arg4, mmap_flags_tbl),
 531                                     arg5,
 532                                     arg6));
 533         break;
 534     case TARGET_OPENBSD_NR_mprotect:
 535         ret = get_errno(target_mprotect(arg1, arg2, arg3));
 536         break;
 537     case TARGET_OPENBSD_NR_syscall:
 538     case TARGET_OPENBSD_NR___syscall:
 539         ret = do_openbsd_syscall(cpu_env,arg1 & 0xffff,arg2,arg3,arg4,arg5,arg6,0);
 540         break;
 541     default:
 542         ret = syscall(num, arg1, arg2, arg3, arg4, arg5, arg6);
 543         break;
 544     }
 545  fail:
 546 #ifdef DEBUG
 547     gemu_log(" = %ld\n", ret);
 548 #endif
 549     if (do_strace)
 550         print_openbsd_syscall_ret(num, ret);
 551     return ret;
 552  efault:
 553     ret = -TARGET_EFAULT;
 554     goto fail;
 555 }
 556
 557 void syscall_init(void)
 558 {
 559 }