aboutsummaryrefslogtreecommitdiff
path: root/bsd-user/freebsd/os-syscall.c
blob: 2623caf8007eb9ef644a4a17caa51c76b539e0e5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
/*
 *  BSD syscalls
 *
 *  Copyright (c) 2003-2008 Fabrice Bellard
 *  Copyright (c) 2013-2014 Stacey D. Son
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, see <http://www.gnu.org/licenses/>.
 */

/*
 * We need the FreeBSD "legacy" definitions. Rust needs the FreeBSD 11 system
 * calls since it doesn't use libc at all, so we have to emulate that despite
 * FreeBSD 11 being EOL'd.
 */
#define _WANT_FREEBSD11_STAT
#define _WANT_FREEBSD11_STATFS
#define _WANT_FREEBSD11_DIRENT
#define _WANT_KERNEL_ERRNO
#define _WANT_SEMUN
#include "qemu/osdep.h"
#include "qemu/cutils.h"
#include "qemu/path.h"
#include <sys/syscall.h>
#include <sys/param.h>
#include <sys/sysctl.h>
#include <utime.h>

#include "qemu.h"
#include "signal-common.h"
#include "user/syscall-trace.h"

#include "bsd-file.h"
#include "bsd-proc.h"

/* I/O */
safe_syscall3(int, open, const char *, path, int, flags, mode_t, mode);
safe_syscall4(int, openat, int, fd, const char *, path, int, flags, mode_t,
    mode);

safe_syscall3(ssize_t, read, int, fd, void *, buf, size_t, nbytes);
safe_syscall4(ssize_t, pread, int, fd, void *, buf, size_t, nbytes, off_t,
    offset);
safe_syscall3(ssize_t, readv, int, fd, const struct iovec *, iov, int, iovcnt);
safe_syscall4(ssize_t, preadv, int, fd, const struct iovec *, iov, int, iovcnt,
    off_t, offset);

safe_syscall3(ssize_t, write, int, fd, void *, buf, size_t, nbytes);
safe_syscall4(ssize_t, pwrite, int, fd, void *, buf, size_t, nbytes, off_t,
    offset);
safe_syscall3(ssize_t, writev, int, fd, const struct iovec *, iov, int, iovcnt);
safe_syscall4(ssize_t, pwritev, int, fd, const struct iovec *, iov, int, iovcnt,
    off_t, offset);

void target_set_brk(abi_ulong new_brk)
{
}

/*
 * errno conversion.
 */
abi_long get_errno(abi_long ret)
{
    if (ret == -1) {
        return -host_to_target_errno(errno);
    } else {
        return ret;
    }
}

int host_to_target_errno(int err)
{
    /*
     * All the BSDs have the property that the error numbers are uniform across
     * all architectures for a given BSD, though they may vary between different
     * BSDs.
     */
    return err;
}

bool is_error(abi_long ret)
{
    return (abi_ulong)ret >= (abi_ulong)(-4096);
}

/*
 * Unlocks a iovec. Unlike unlock_iovec, it assumes the tvec array itself is
 * already locked from target_addr. It will be unlocked as well as all the iovec
 * elements.
 */
static void helper_unlock_iovec(struct target_iovec *target_vec,
                                abi_ulong target_addr, struct iovec *vec,
                                int count, int copy)
{
    for (int i = 0; i < count; i++) {
        abi_ulong base = tswapal(target_vec[i].iov_base);

        if (vec[i].iov_base) {
            unlock_user(vec[i].iov_base, base, copy ? vec[i].iov_len : 0);
        }
    }
    unlock_user(target_vec, target_addr, 0);
}

struct iovec *lock_iovec(int type, abi_ulong target_addr,
        int count, int copy)
{
    struct target_iovec *target_vec;
    struct iovec *vec;
    abi_ulong total_len, max_len;
    int i;
    int err = 0;

    if (count == 0) {
        errno = 0;
        return NULL;
    }
    if (count < 0 || count > IOV_MAX) {
        errno = EINVAL;
        return NULL;
    }

    vec = g_try_new0(struct iovec, count);
    if (vec == NULL) {
        errno = ENOMEM;
        return NULL;
    }

    target_vec = lock_user(VERIFY_READ, target_addr,
                           count * sizeof(struct target_iovec), 1);
    if (target_vec == NULL) {
        err = EFAULT;
        goto fail2;
    }

    max_len = 0x7fffffff & MIN(TARGET_PAGE_MASK, PAGE_MASK);
    total_len = 0;

    for (i = 0; i < count; i++) {
        abi_ulong base = tswapal(target_vec[i].iov_base);
        abi_long len = tswapal(target_vec[i].iov_len);

        if (len < 0) {
            err = EINVAL;
            goto fail;
        } else if (len == 0) {
            /* Zero length pointer is ignored. */
            vec[i].iov_base = 0;
        } else {
            vec[i].iov_base = lock_user(type, base, len, copy);
            /*
             * If the first buffer pointer is bad, this is a fault.  But
             * subsequent bad buffers will result in a partial write; this is
             * realized by filling the vector with null pointers and zero
             * lengths.
             */
            if (!vec[i].iov_base) {
                if (i == 0) {
                    err = EFAULT;
                    goto fail;
                } else {
                    /*
                     * Fail all the subsequent addresses, they are already
                     * zero'd.
                     */
                    goto out;
                }
            }
            if (len > max_len - total_len) {
                len = max_len - total_len;
            }
        }
        vec[i].iov_len = len;
        total_len += len;
    }
out:
    unlock_user(target_vec, target_addr, 0);
    return vec;

fail:
    helper_unlock_iovec(target_vec, target_addr, vec, i, copy);
fail2:
    g_free(vec);
    errno = err;
    return NULL;
}

void unlock_iovec(struct iovec *vec, abi_ulong target_addr,
        int count, int copy)
{
    struct target_iovec *target_vec;

    target_vec = lock_user(VERIFY_READ, target_addr,
                           count * sizeof(struct target_iovec), 1);
    if (target_vec) {
        helper_unlock_iovec(target_vec, target_addr, vec, count, copy);
    }

    g_free(vec);
}

/*
 * All errnos that freebsd_syscall() returns must be -TARGET_<errcode>.
 */
static abi_long freebsd_syscall(void *cpu_env, int num, abi_long arg1,
                                abi_long arg2, abi_long arg3, abi_long arg4,
                                abi_long arg5, abi_long arg6, abi_long arg7,
                                abi_long arg8)
{
    abi_long ret;

    switch (num) {
        /*
         * process system calls
         */
    case TARGET_FREEBSD_NR_exit: /* exit(2) */
        ret = do_bsd_exit(cpu_env, arg1);
        break;

        /*
         * File system calls.
         */
    case TARGET_FREEBSD_NR_read: /* read(2) */
        ret = do_bsd_read(arg1, arg2, arg3);
        break;

    case TARGET_FREEBSD_NR_pread: /* pread(2) */
        ret = do_bsd_pread(cpu_env, arg1, arg2, arg3, arg4, arg5, arg6);
        break;

    case TARGET_FREEBSD_NR_readv: /* readv(2) */
        ret = do_bsd_readv(arg1, arg2, arg3);
        break;

    case TARGET_FREEBSD_NR_preadv: /* preadv(2) */
        ret = do_bsd_preadv(cpu_env, arg1, arg2, arg3, arg4, arg5, arg6);

    case TARGET_FREEBSD_NR_write: /* write(2) */
        ret = do_bsd_write(arg1, arg2, arg3);
        break;

    case TARGET_FREEBSD_NR_pwrite: /* pwrite(2) */
        ret = do_bsd_pwrite(cpu_env, arg1, arg2, arg3, arg4, arg5, arg6);
        break;

    case TARGET_FREEBSD_NR_writev: /* writev(2) */
        ret = do_bsd_writev(arg1, arg2, arg3);
        break;

    case TARGET_FREEBSD_NR_pwritev: /* pwritev(2) */
        ret = do_bsd_pwritev(cpu_env, arg1, arg2, arg3, arg4, arg5, arg6);
        break;

    case TARGET_FREEBSD_NR_open: /* open(2) */
        ret = do_bsd_open(arg1, arg2, arg3);
        break;

    case TARGET_FREEBSD_NR_openat: /* openat(2) */
        ret = do_bsd_openat(arg1, arg2, arg3, arg4);
        break;

    case TARGET_FREEBSD_NR_close: /* close(2) */
        ret = do_bsd_close(arg1);
        break;

    case TARGET_FREEBSD_NR_fdatasync: /* fdatasync(2) */
        ret = do_bsd_fdatasync(arg1);
        break;

    case TARGET_FREEBSD_NR_fsync: /* fsync(2) */
        ret = do_bsd_fsync(arg1);
        break;

    case TARGET_FREEBSD_NR_freebsd12_closefrom: /* closefrom(2) */
        ret = do_bsd_closefrom(arg1);
        break;

    case TARGET_FREEBSD_NR_revoke: /* revoke(2) */
        ret = do_bsd_revoke(arg1);
        break;

    case TARGET_FREEBSD_NR_access: /* access(2) */
        ret = do_bsd_access(arg1, arg2);
        break;

    case TARGET_FREEBSD_NR_eaccess: /* eaccess(2) */
        ret = do_bsd_eaccess(arg1, arg2);
        break;

    case TARGET_FREEBSD_NR_faccessat: /* faccessat(2) */
        ret = do_bsd_faccessat(arg1, arg2, arg3, arg4);
        break;

    case TARGET_FREEBSD_NR_chdir: /* chdir(2) */
        ret = do_bsd_chdir(arg1);
        break;

    case TARGET_FREEBSD_NR_fchdir: /* fchdir(2) */
        ret = do_bsd_fchdir(arg1);
        break;

    case TARGET_FREEBSD_NR_rename: /* rename(2) */
        ret = do_bsd_rename(arg1, arg2);
        break;

    case TARGET_FREEBSD_NR_renameat: /* renameat(2) */
        ret = do_bsd_renameat(arg1, arg2, arg3, arg4);
        break;

    case TARGET_FREEBSD_NR_link: /* link(2) */
        ret = do_bsd_link(arg1, arg2);
        break;

    case TARGET_FREEBSD_NR_linkat: /* linkat(2) */
        ret = do_bsd_linkat(arg1, arg2, arg3, arg4, arg5);
        break;

    case TARGET_FREEBSD_NR_unlink: /* unlink(2) */
        ret = do_bsd_unlink(arg1);
        break;

    case TARGET_FREEBSD_NR_unlinkat: /* unlinkat(2) */
        ret = do_bsd_unlinkat(arg1, arg2, arg3);
        break;

    case TARGET_FREEBSD_NR_mkdir: /* mkdir(2) */
        ret = do_bsd_mkdir(arg1, arg2);
        break;

    case TARGET_FREEBSD_NR_mkdirat: /* mkdirat(2) */
        ret = do_bsd_mkdirat(arg1, arg2, arg3);
        break;

    case TARGET_FREEBSD_NR_rmdir: /* rmdir(2) (XXX no rmdirat()?) */
        ret = do_bsd_rmdir(arg1);
        break;

    case TARGET_FREEBSD_NR___getcwd: /* undocumented __getcwd() */
        ret = do_bsd___getcwd(arg1, arg2);
        break;

    case TARGET_FREEBSD_NR_dup: /* dup(2) */
        ret = do_bsd_dup(arg1);
        break;

    case TARGET_FREEBSD_NR_dup2: /* dup2(2) */
        ret = do_bsd_dup2(arg1, arg2);
        break;

    case TARGET_FREEBSD_NR_truncate: /* truncate(2) */
        ret = do_bsd_truncate(cpu_env, arg1, arg2, arg3, arg4);
        break;

    case TARGET_FREEBSD_NR_ftruncate: /* ftruncate(2) */
        ret = do_bsd_ftruncate(cpu_env, arg1, arg2, arg3, arg4);
        break;

    case TARGET_FREEBSD_NR_acct: /* acct(2) */
        ret = do_bsd_acct(arg1);
        break;

    case TARGET_FREEBSD_NR_sync: /* sync(2) */
        ret = do_bsd_sync();
        break;

    default:
        qemu_log_mask(LOG_UNIMP, "Unsupported syscall: %d\n", num);
        ret = -TARGET_ENOSYS;
        break;
    }

    return ret;
}

/*
 * do_freebsd_syscall() should always have a single exit point at the end so
 * that actions, such as logging of syscall results, can be performed. This
 * as a wrapper around freebsd_syscall() so that actually happens. Since
 * that is a singleton, modern compilers will inline it anyway...
 */
abi_long do_freebsd_syscall(void *cpu_env, int num, abi_long arg1,
                            abi_long arg2, abi_long arg3, abi_long arg4,
                            abi_long arg5, abi_long arg6, abi_long arg7,
                            abi_long arg8)
{
    CPUState *cpu = env_cpu(cpu_env);
    int ret;

    trace_guest_user_syscall(cpu, num, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8);
    if (do_strace) {
        print_freebsd_syscall(num, arg1, arg2, arg3, arg4, arg5, arg6);
    }

    ret = freebsd_syscall(cpu_env, num, arg1, arg2, arg3, arg4, arg5, arg6,
                          arg7, arg8);
    if (do_strace) {
        print_freebsd_syscall_ret(num, ret);
    }
    trace_guest_user_syscall_ret(cpu, num, ret);

    return ret;
}

void syscall_init(void)
{
}