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