bsd-user/bsd-file.h

   1 /*
   2  *  file related system call shims and definitions
   3  *
   4  *  Copyright (c) 2013 Stacey D. Son
   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
  20 #ifndef BSD_FILE_H
  21 #define BSD_FILE_H
  22
  23 #include "qemu/path.h"
  24
  25 extern struct iovec *lock_iovec(int type, abi_ulong target_addr, int count,
  26         int copy);
  27 extern void unlock_iovec(struct iovec *vec, abi_ulong target_addr, int count,
  28         int copy);
  29
  30 ssize_t safe_read(int fd, void *buf, size_t nbytes);
  31 ssize_t safe_pread(int fd, void *buf, size_t nbytes, off_t offset);
  32 ssize_t safe_readv(int fd, const struct iovec *iov, int iovcnt);
  33 ssize_t safe_preadv(int fd, const struct iovec *iov, int iovcnt, off_t offset);
  34
  35 ssize_t safe_write(int fd, void *buf, size_t nbytes);
  36 ssize_t safe_pwrite(int fd, void *buf, size_t nbytes, off_t offset);
  37 ssize_t safe_writev(int fd, const struct iovec *iov, int iovcnt);
  38 ssize_t safe_pwritev(int fd, const struct iovec *iov, int iovcnt, off_t offset);
  39
  40 /* read(2) */
  41 static abi_long do_bsd_read(abi_long arg1, abi_long arg2, abi_long arg3)
  42 {
  43     abi_long ret;
  44     void *p;
  45
  46     p = lock_user(VERIFY_WRITE, arg2, arg3, 0);
  47     if (p == NULL) {
  48         return -TARGET_EFAULT;
  49     }
  50     ret = get_errno(safe_read(arg1, p, arg3));
  51     unlock_user(p, arg2, ret);
  52
  53     return ret;
  54 }
  55
  56 /* pread(2) */
  57 static abi_long do_bsd_pread(void *cpu_env, abi_long arg1,
  58     abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5, abi_long arg6)
  59 {
  60     abi_long ret;
  61     void *p;
  62
  63     p = lock_user(VERIFY_WRITE, arg2, arg3, 0);
  64     if (p == NULL) {
  65         return -TARGET_EFAULT;
  66     }
  67     if (regpairs_aligned(cpu_env) != 0) {
  68         arg4 = arg5;
  69         arg5 = arg6;
  70     }
  71     ret = get_errno(safe_pread(arg1, p, arg3, target_arg64(arg4, arg5)));
  72     unlock_user(p, arg2, ret);
  73
  74     return ret;
  75 }
  76
  77 /* readv(2) */
  78 static abi_long do_bsd_readv(abi_long arg1, abi_long arg2, abi_long arg3)
  79 {
  80     abi_long ret;
  81     struct iovec *vec = lock_iovec(VERIFY_WRITE, arg2, arg3, 0);
  82
  83     if (vec != NULL) {
  84         ret = get_errno(safe_readv(arg1, vec, arg3));
  85         unlock_iovec(vec, arg2, arg3, 1);
  86     } else {
  87         ret = -host_to_target_errno(errno);
  88     }
  89
  90     return ret;
  91 }
  92
  93 /* preadv(2) */
  94 static abi_long do_bsd_preadv(void *cpu_env, abi_long arg1,
  95     abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5, abi_long arg6)
  96 {
  97     abi_long ret;
  98     struct iovec *vec = lock_iovec(VERIFY_WRITE, arg2, arg3, 1);
  99
 100     if (vec != NULL) {
 101         if (regpairs_aligned(cpu_env) != 0) {
 102             arg4 = arg5;
 103             arg5 = arg6;
 104         }
 105         ret = get_errno(safe_preadv(arg1, vec, arg3, target_arg64(arg4, arg5)));
 106         unlock_iovec(vec, arg2, arg3, 0);
 107     } else {
 108         ret = -host_to_target_errno(errno);
 109     }
 110
 111     return ret;
 112 }
 113
 114 /* write(2) */
 115 static abi_long do_bsd_write(abi_long arg1, abi_long arg2, abi_long arg3)
 116 {
 117     abi_long nbytes, ret;
 118     void *p;
 119
 120     /* nbytes < 0 implies that it was larger than SIZE_MAX. */
 121     nbytes = arg3;
 122     if (nbytes < 0) {
 123         return -TARGET_EINVAL;
 124     }
 125     p = lock_user(VERIFY_READ, arg2, nbytes, 1);
 126     if (p == NULL) {
 127         return -TARGET_EFAULT;
 128     }
 129     ret = get_errno(safe_write(arg1, p, arg3));
 130     unlock_user(p, arg2, 0);
 131
 132     return ret;
 133 }
 134
 135 /* pwrite(2) */
 136 static abi_long do_bsd_pwrite(void *cpu_env, abi_long arg1,
 137     abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5, abi_long arg6)
 138 {
 139     abi_long ret;
 140     void *p;
 141
 142     p = lock_user(VERIFY_READ, arg2, arg3, 1);
 143     if (p == NULL) {
 144         return -TARGET_EFAULT;
 145     }
 146     if (regpairs_aligned(cpu_env) != 0) {
 147         arg4 = arg5;
 148         arg5 = arg6;
 149     }
 150     ret = get_errno(safe_pwrite(arg1, p, arg3, target_arg64(arg4, arg5)));
 151     unlock_user(p, arg2, 0);
 152
 153     return ret;
 154 }
 155
 156 /* writev(2) */
 157 static abi_long do_bsd_writev(abi_long arg1, abi_long arg2, abi_long arg3)
 158 {
 159     abi_long ret;
 160     struct iovec *vec = lock_iovec(VERIFY_READ, arg2, arg3, 1);
 161
 162     if (vec != NULL) {
 163         ret = get_errno(safe_writev(arg1, vec, arg3));
 164         unlock_iovec(vec, arg2, arg3, 0);
 165     } else {
 166         ret = -host_to_target_errno(errno);
 167     }
 168
 169     return ret;
 170 }
 171
 172 /* pwritev(2) */
 173 static abi_long do_bsd_pwritev(void *cpu_env, abi_long arg1,
 174     abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5, abi_long arg6)
 175 {
 176     abi_long ret;
 177     struct iovec *vec = lock_iovec(VERIFY_READ, arg2, arg3, 1);
 178
 179     if (vec != NULL) {
 180         if (regpairs_aligned(cpu_env) != 0) {
 181             arg4 = arg5;
 182             arg5 = arg6;
 183         }
 184         ret = get_errno(safe_pwritev(arg1, vec, arg3, target_arg64(arg4, arg5)));
 185         unlock_iovec(vec, arg2, arg3, 0);
 186     } else {
 187         ret = -host_to_target_errno(errno);
 188     }
 189
 190     return ret;
 191 }
 192
 193 #endif /* BSD_FILE_H */