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 <signal.h>
  33 #include <utime.h>
  34
  35 #include "qemu.h"
  36 #include "qemu-common.h"
  37
  38 //#define DEBUG
  39
  40 static abi_ulong target_brk;
  41 static abi_ulong target_original_brk;
  42
  43 #define get_errno(x) (x)
  44 #define target_to_host_bitmask(x, tbl) (x)
  45
  46 void target_set_brk(abi_ulong new_brk)
  47 {
  48     target_original_brk = target_brk = HOST_PAGE_ALIGN(new_brk);
  49 }
  50
  51 /* do_syscall() should always have a single exit point at the end so
  52    that actions, such as logging of syscall results, can be performed.
  53    All errnos that do_syscall() returns must be -TARGET_<errcode>. */
  54 abi_long do_freebsd_syscall(void *cpu_env, int num, abi_long arg1,
  55                             abi_long arg2, abi_long arg3, abi_long arg4,
  56                             abi_long arg5, abi_long arg6)
  57 {
  58     abi_long ret;
  59     void *p;
  60
  61 #ifdef DEBUG
  62     gemu_log("freebsd syscall %d\n", num);
  63 #endif
  64     if(do_strace)
  65         print_freebsd_syscall(num, arg1, arg2, arg3, arg4, arg5, arg6);
  66
  67     switch(num) {
  68     case TARGET_FREEBSD_NR_exit:
  69 #ifdef TARGET_GPROF
  70         _mcleanup();
  71 #endif
  72         gdb_exit(cpu_env, arg1);
  73         /* XXX: should free thread stack and CPU env */
  74         _exit(arg1);
  75         ret = 0; /* avoid warning */
  76         break;
  77     case TARGET_FREEBSD_NR_read:
  78         if (!(p = lock_user(VERIFY_WRITE, arg2, arg3, 0)))
  79             goto efault;
  80         ret = get_errno(read(arg1, p, arg3));
  81         unlock_user(p, arg2, ret);
  82         break;
  83     case TARGET_FREEBSD_NR_write:
  84         if (!(p = lock_user(VERIFY_READ, arg2, arg3, 1)))
  85             goto efault;
  86         ret = get_errno(write(arg1, p, arg3));
  87         unlock_user(p, arg2, 0);
  88         break;
  89     case TARGET_FREEBSD_NR_open:
  90         if (!(p = lock_user_string(arg1)))
  91             goto efault;
  92         ret = get_errno(open(path(p),
  93                              target_to_host_bitmask(arg2, fcntl_flags_tbl),
  94                              arg3));
  95         unlock_user(p, arg1, 0);
  96         break;
  97     case TARGET_FREEBSD_NR_mmap:
  98         ret = get_errno(target_mmap(arg1, arg2, arg3,
  99                                     target_to_host_bitmask(arg4, mmap_flags_tbl),
 100                                     arg5,
 101                                     arg6));
 102         break;
 103     case TARGET_FREEBSD_NR_mprotect:
 104         ret = get_errno(target_mprotect(arg1, arg2, arg3));
 105         break;
 106     case TARGET_FREEBSD_NR_syscall:
 107     case TARGET_FREEBSD_NR___syscall:
 108         ret = do_freebsd_syscall(cpu_env,arg1 & 0xffff,arg2,arg3,arg4,arg5,arg6,0);
 109         break;
 110     default:
 111         ret = syscall(num, arg1, arg2, arg3, arg4, arg5, arg6);
 112         break;
 113     }
 114  fail:
 115 #ifdef DEBUG
 116     gemu_log(" = %ld\n", ret);
 117 #endif
 118     if (do_strace)
 119         print_freebsd_syscall_ret(num, ret);
 120     return ret;
 121  efault:
 122     ret = -TARGET_EFAULT;
 123     goto fail;
 124 }
 125
 126 abi_long do_netbsd_syscall(void *cpu_env, int num, abi_long arg1,
 127                            abi_long arg2, abi_long arg3, abi_long arg4,
 128                            abi_long arg5, abi_long arg6)
 129 {
 130     abi_long ret;
 131     void *p;
 132
 133 #ifdef DEBUG
 134     gemu_log("netbsd syscall %d\n", num);
 135 #endif
 136     if(do_strace)
 137         print_netbsd_syscall(num, arg1, arg2, arg3, arg4, arg5, arg6);
 138
 139     switch(num) {
 140     case TARGET_NETBSD_NR_exit:
 141 #ifdef TARGET_GPROF
 142         _mcleanup();
 143 #endif
 144         gdb_exit(cpu_env, arg1);
 145         /* XXX: should free thread stack and CPU env */
 146         _exit(arg1);
 147         ret = 0; /* avoid warning */
 148         break;
 149     case TARGET_NETBSD_NR_read:
 150         if (!(p = lock_user(VERIFY_WRITE, arg2, arg3, 0)))
 151             goto efault;
 152         ret = get_errno(read(arg1, p, arg3));
 153         unlock_user(p, arg2, ret);
 154         break;
 155     case TARGET_NETBSD_NR_write:
 156         if (!(p = lock_user(VERIFY_READ, arg2, arg3, 1)))
 157             goto efault;
 158         ret = get_errno(write(arg1, p, arg3));
 159         unlock_user(p, arg2, 0);
 160         break;
 161     case TARGET_NETBSD_NR_open:
 162         if (!(p = lock_user_string(arg1)))
 163             goto efault;
 164         ret = get_errno(open(path(p),
 165                              target_to_host_bitmask(arg2, fcntl_flags_tbl),
 166                              arg3));
 167         unlock_user(p, arg1, 0);
 168         break;
 169     case TARGET_NETBSD_NR_mmap:
 170         ret = get_errno(target_mmap(arg1, arg2, arg3,
 171                                     target_to_host_bitmask(arg4, mmap_flags_tbl),
 172                                     arg5,
 173                                     arg6));
 174         break;
 175     case TARGET_NETBSD_NR_mprotect:
 176         ret = get_errno(target_mprotect(arg1, arg2, arg3));
 177         break;
 178     case TARGET_NETBSD_NR_syscall:
 179     case TARGET_NETBSD_NR___syscall:
 180         ret = do_netbsd_syscall(cpu_env,arg1 & 0xffff,arg2,arg3,arg4,arg5,arg6,0);
 181         break;
 182     default:
 183         ret = syscall(num, arg1, arg2, arg3, arg4, arg5, arg6);
 184         break;
 185     }
 186  fail:
 187 #ifdef DEBUG
 188     gemu_log(" = %ld\n", ret);
 189 #endif
 190     if (do_strace)
 191         print_netbsd_syscall_ret(num, ret);
 192     return ret;
 193  efault:
 194     ret = -TARGET_EFAULT;
 195     goto fail;
 196 }
 197
 198 abi_long do_openbsd_syscall(void *cpu_env, int num, abi_long arg1,
 199                             abi_long arg2, abi_long arg3, abi_long arg4,
 200                             abi_long arg5, abi_long arg6)
 201 {
 202     abi_long ret;
 203     void *p;
 204
 205 #ifdef DEBUG
 206     gemu_log("openbsd syscall %d\n", num);
 207 #endif
 208     if(do_strace)
 209         print_openbsd_syscall(num, arg1, arg2, arg3, arg4, arg5, arg6);
 210
 211     switch(num) {
 212     case TARGET_OPENBSD_NR_exit:
 213 #ifdef TARGET_GPROF
 214         _mcleanup();
 215 #endif
 216         gdb_exit(cpu_env, arg1);
 217         /* XXX: should free thread stack and CPU env */
 218         _exit(arg1);
 219         ret = 0; /* avoid warning */
 220         break;
 221     case TARGET_OPENBSD_NR_read:
 222         if (!(p = lock_user(VERIFY_WRITE, arg2, arg3, 0)))
 223             goto efault;
 224         ret = get_errno(read(arg1, p, arg3));
 225         unlock_user(p, arg2, ret);
 226         break;
 227     case TARGET_OPENBSD_NR_write:
 228         if (!(p = lock_user(VERIFY_READ, arg2, arg3, 1)))
 229             goto efault;
 230         ret = get_errno(write(arg1, p, arg3));
 231         unlock_user(p, arg2, 0);
 232         break;
 233     case TARGET_OPENBSD_NR_open:
 234         if (!(p = lock_user_string(arg1)))
 235             goto efault;
 236         ret = get_errno(open(path(p),
 237                              target_to_host_bitmask(arg2, fcntl_flags_tbl),
 238                              arg3));
 239         unlock_user(p, arg1, 0);
 240         break;
 241     case TARGET_OPENBSD_NR_mmap:
 242         ret = get_errno(target_mmap(arg1, arg2, arg3,
 243                                     target_to_host_bitmask(arg4, mmap_flags_tbl),
 244                                     arg5,
 245                                     arg6));
 246         break;
 247     case TARGET_OPENBSD_NR_mprotect:
 248         ret = get_errno(target_mprotect(arg1, arg2, arg3));
 249         break;
 250     case TARGET_OPENBSD_NR_syscall:
 251     case TARGET_OPENBSD_NR___syscall:
 252         ret = do_openbsd_syscall(cpu_env,arg1 & 0xffff,arg2,arg3,arg4,arg5,arg6,0);
 253         break;
 254     default:
 255         ret = syscall(num, arg1, arg2, arg3, arg4, arg5, arg6);
 256         break;
 257     }
 258  fail:
 259 #ifdef DEBUG
 260     gemu_log(" = %ld\n", ret);
 261 #endif
 262     if (do_strace)
 263         print_openbsd_syscall_ret(num, ret);
 264     return ret;
 265  efault:
 266     ret = -TARGET_EFAULT;
 267     goto fail;
 268 }
 269
 270 void syscall_init(void)
 271 {
 272 }