[mirror_qemu.git] / bsd-user / freebsd / os-syscall.c

/*
 *  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;

    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)
{
}
Commit	Line	Data
66eed099 WL	1	/*
	2	* BSD syscalls
	3	*
	4	* Copyright (c) 2003-2008 Fabrice Bellard
	5	* Copyright (c) 2013-2014 Stacey D. Son
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, see <http://www.gnu.org/licenses/>.
	19	*/
	20
	21	/*
	22	* We need the FreeBSD "legacy" definitions. Rust needs the FreeBSD 11 system
	23	* calls since it doesn't use libc at all, so we have to emulate that despite
	24	* FreeBSD 11 being EOL'd.
	25	*/
	26	#define _WANT_FREEBSD11_STAT
	27	#define _WANT_FREEBSD11_STATFS
	28	#define _WANT_FREEBSD11_DIRENT
	29	#define _WANT_KERNEL_ERRNO
	30	#define _WANT_SEMUN
	31	#include "qemu/osdep.h"
	32	#include "qemu/cutils.h"
	33	#include "qemu/path.h"
	34	#include <sys/syscall.h>
	35	#include <sys/param.h>
	36	#include <sys/sysctl.h>
	37	#include <utime.h>
	38
	39	#include "qemu.h"
66eed099 WL	40	#include "signal-common.h"
	41	#include "user/syscall-trace.h"
	42
c5c84d16	43	#include "bsd-file.h"
9554d330	44	#include "bsd-proc.h"
c5c84d16	45
80da1b00	46	/* I/O */
77d3522b WL	47	safe_syscall3(int, open, const char *, path, int, flags, mode_t, mode);
	48	safe_syscall4(int, openat, int, fd, const char *, path, int, flags, mode_t,
	49	mode);
	50
80da1b00 WL	51	safe_syscall3(ssize_t, read, int, fd, void *, buf, size_t, nbytes);
	52	safe_syscall4(ssize_t, pread, int, fd, void *, buf, size_t, nbytes, off_t,
	53	offset);
	54	safe_syscall3(ssize_t, readv, int, fd, const struct iovec *, iov, int, iovcnt);
	55	safe_syscall4(ssize_t, preadv, int, fd, const struct iovec *, iov, int, iovcnt,
	56	off_t, offset);
	57
770d8aba WL	58	safe_syscall3(ssize_t, write, int, fd, void *, buf, size_t, nbytes);
	59	safe_syscall4(ssize_t, pwrite, int, fd, void *, buf, size_t, nbytes, off_t,
	60	offset);
	61	safe_syscall3(ssize_t, writev, int, fd, const struct iovec *, iov, int, iovcnt);
	62	safe_syscall4(ssize_t, pwritev, int, fd, const struct iovec *, iov, int, iovcnt,
	63	off_t, offset);
	64
66eed099 WL	65	void target_set_brk(abi_ulong new_brk)
	66	{
	67	}
	68
deeff83b WL	69	/*
	70	* errno conversion.
	71	*/
	72	abi_long get_errno(abi_long ret)
66eed099	73	{
deeff83b WL	74	if (ret == -1) {
	75	return -host_to_target_errno(errno);
	76	} else {
	77	return ret;
	78	}
	79	}
66eed099	80
deeff83b WL	81	int host_to_target_errno(int err)
	82	{
	83	/*
	84	* All the BSDs have the property that the error numbers are uniform across
	85	* all architectures for a given BSD, though they may vary between different
	86	* BSDs.
	87	*/
	88	return err;
	89	}
	90
	91	bool is_error(abi_long ret)
	92	{
66eed099 WL	93	return (abi_ulong)ret >= (abi_ulong)(-4096);
	94	}
	95
1ed771b2 WL	96	/*
	97	* Unlocks a iovec. Unlike unlock_iovec, it assumes the tvec array itself is
	98	* already locked from target_addr. It will be unlocked as well as all the iovec
	99	* elements.
	100	*/
	101	static void helper_unlock_iovec(struct target_iovec *target_vec,
	102	abi_ulong target_addr, struct iovec *vec,
	103	int count, int copy)
	104	{
	105	for (int i = 0; i < count; i++) {
	106	abi_ulong base = tswapal(target_vec[i].iov_base);
	107
	108	if (vec[i].iov_base) {
	109	unlock_user(vec[i].iov_base, base, copy ? vec[i].iov_len : 0);
	110	}
	111	}
	112	unlock_user(target_vec, target_addr, 0);
	113	}
	114
	115	struct iovec *lock_iovec(int type, abi_ulong target_addr,
	116	int count, int copy)
	117	{
	118	struct target_iovec *target_vec;
	119	struct iovec *vec;
	120	abi_ulong total_len, max_len;
	121	int i;
	122	int err = 0;
	123
	124	if (count == 0) {
	125	errno = 0;
	126	return NULL;
	127	}
	128	if (count < 0 \|\| count > IOV_MAX) {
	129	errno = EINVAL;
	130	return NULL;
	131	}
	132
	133	vec = g_try_new0(struct iovec, count);
	134	if (vec == NULL) {
	135	errno = ENOMEM;
	136	return NULL;
	137	}
	138
	139	target_vec = lock_user(VERIFY_READ, target_addr,
	140	count * sizeof(struct target_iovec), 1);
	141	if (target_vec == NULL) {
	142	err = EFAULT;
	143	goto fail2;
	144	}
	145
	146	max_len = 0x7fffffff & MIN(TARGET_PAGE_MASK, PAGE_MASK);
	147	total_len = 0;
	148
	149	for (i = 0; i < count; i++) {
	150	abi_ulong base = tswapal(target_vec[i].iov_base);
	151	abi_long len = tswapal(target_vec[i].iov_len);
	152
	153	if (len < 0) {
	154	err = EINVAL;
	155	goto fail;
	156	} else if (len == 0) {
	157	/* Zero length pointer is ignored. */
	158	vec[i].iov_base = 0;
	159	} else {
160	vec[i].iov_base = lock_user(type, base, len, copy);
161	/*
162	* If the first buffer pointer is bad, this is a fault. But
163	* subsequent bad buffers will result in a partial write; this is
164	* realized by filling the vector with null pointers and zero
165	* lengths.
166	*/
167	if (!vec[i].iov_base) {
168	if (i == 0) {
169	err = EFAULT;
170	goto fail;
171	} else {
172	/*
173	* Fail all the subsequent addresses, they are already
174	* zero'd.
175	*/
176	goto out;
177	}
178	}
179	if (len > max_len - total_len) {
180	len = max_len - total_len;
181	}
182	}
183	vec[i].iov_len = len;
184	total_len += len;
185	}
186	out:
187	unlock_user(target_vec, target_addr, 0);
188	return vec;
189
190	fail:
191	helper_unlock_iovec(target_vec, target_addr, vec, i, copy);
192	fail2:
193	g_free(vec);
194	errno = err;
195	return NULL;
196	}
197
883808d8 WL	198	void unlock_iovec(struct iovec *vec, abi_ulong target_addr,
	199	int count, int copy)
	200	{
	201	struct target_iovec *target_vec;
	202
	203	target_vec = lock_user(VERIFY_READ, target_addr,
	204	count * sizeof(struct target_iovec), 1);
	205	if (target_vec) {
	206	helper_unlock_iovec(target_vec, target_addr, vec, count, copy);
	207	}
	208
	209	g_free(vec);
	210	}
	211
66eed099	212	/*
db697887 WL	213	* All errnos that freebsd_syscall() returns must be -TARGET_<errcode>.
	214	*/
	215	static abi_long freebsd_syscall(void *cpu_env, int num, abi_long arg1,
	216	abi_long arg2, abi_long arg3, abi_long arg4,
	217	abi_long arg5, abi_long arg6, abi_long arg7,
	218	abi_long arg8)
	219	{
	220	abi_long ret;
	221
	222	switch (num) {
9554d330 WL	223	/*
	224	* process system calls
	225	*/
	226	case TARGET_FREEBSD_NR_exit: /* exit(2) */
	227	ret = do_bsd_exit(cpu_env, arg1);
	228	break;
80da1b00 WL	229
	230	/*
	231	* File system calls.
	232	*/
	233	case TARGET_FREEBSD_NR_read: /* read(2) */
	234	ret = do_bsd_read(arg1, arg2, arg3);
	235	break;
	236
	237	case TARGET_FREEBSD_NR_pread: /* pread(2) */
	238	ret = do_bsd_pread(cpu_env, arg1, arg2, arg3, arg4, arg5, arg6);
	239	break;
	240
	241	case TARGET_FREEBSD_NR_readv: /* readv(2) */
	242	ret = do_bsd_readv(arg1, arg2, arg3);
	243	break;
	244
	245	case TARGET_FREEBSD_NR_preadv: /* preadv(2) */
	246	ret = do_bsd_preadv(cpu_env, arg1, arg2, arg3, arg4, arg5, arg6);
770d8aba WL	247
	248	case TARGET_FREEBSD_NR_write: /* write(2) */
	249	ret = do_bsd_write(arg1, arg2, arg3);
	250	break;
	251
	252	case TARGET_FREEBSD_NR_pwrite: /* pwrite(2) */
	253	ret = do_bsd_pwrite(cpu_env, arg1, arg2, arg3, arg4, arg5, arg6);
	254	break;
	255
	256	case TARGET_FREEBSD_NR_writev: /* writev(2) */
	257	ret = do_bsd_writev(arg1, arg2, arg3);
	258	break;
	259
	260	case TARGET_FREEBSD_NR_pwritev: /* pwritev(2) */
	261	ret = do_bsd_pwritev(cpu_env, arg1, arg2, arg3, arg4, arg5, arg6);
80da1b00 WL	262	break;
80da1b00 WL	263
77d3522b WL	264	case TARGET_FREEBSD_NR_open: /* open(2) */
	265	ret = do_bsd_open(arg1, arg2, arg3);
	266	break;
	267
	268	case TARGET_FREEBSD_NR_openat: /* openat(2) */
	269	ret = do_bsd_openat(arg1, arg2, arg3, arg4);
	270	break;
	271
	272	case TARGET_FREEBSD_NR_close: /* close(2) */
	273	ret = do_bsd_close(arg1);
	274	break;
	275
a2ba6c7b WL	276	case TARGET_FREEBSD_NR_fdatasync: /* fdatasync(2) */
	277	ret = do_bsd_fdatasync(arg1);
	278	break;
	279
	280	case TARGET_FREEBSD_NR_fsync: /* fsync(2) */
	281	ret = do_bsd_fsync(arg1);
	282	break;
	283
	284	case TARGET_FREEBSD_NR_freebsd12_closefrom: /* closefrom(2) */
	285	ret = do_bsd_closefrom(arg1);
	286	break;
	287
65c6c4c8 WL	288	case TARGET_FREEBSD_NR_revoke: /* revoke(2) */
	289	ret = do_bsd_revoke(arg1);
	290	break;
	291
	292	case TARGET_FREEBSD_NR_access: /* access(2) */
	293	ret = do_bsd_access(arg1, arg2);
	294	break;
	295
	296	case TARGET_FREEBSD_NR_eaccess: /* eaccess(2) */
	297	ret = do_bsd_eaccess(arg1, arg2);
	298	break;
	299
	300	case TARGET_FREEBSD_NR_faccessat: /* faccessat(2) */
	301	ret = do_bsd_faccessat(arg1, arg2, arg3, arg4);
	302	break;
	303
390f547e WL	304	case TARGET_FREEBSD_NR_chdir: /* chdir(2) */
	305	ret = do_bsd_chdir(arg1);
	306	break;
	307
	308	case TARGET_FREEBSD_NR_fchdir: /* fchdir(2) */
	309	ret = do_bsd_fchdir(arg1);
	310	break;
	311
ab5fd2d9 WL	312	case TARGET_FREEBSD_NR_rename: /* rename(2) */
	313	ret = do_bsd_rename(arg1, arg2);
	314	break;
	315
	316	case TARGET_FREEBSD_NR_renameat: /* renameat(2) */
	317	ret = do_bsd_renameat(arg1, arg2, arg3, arg4);
	318	break;
	319
2d3b7e01 WL	320	case TARGET_FREEBSD_NR_link: /* link(2) */
	321	ret = do_bsd_link(arg1, arg2);
	322	break;
	323
	324	case TARGET_FREEBSD_NR_linkat: /* linkat(2) */
	325	ret = do_bsd_linkat(arg1, arg2, arg3, arg4, arg5);
	326	break;
	327
	328	case TARGET_FREEBSD_NR_unlink: /* unlink(2) */
	329	ret = do_bsd_unlink(arg1);
	330	break;
	331
	332	case TARGET_FREEBSD_NR_unlinkat: /* unlinkat(2) */
	333	ret = do_bsd_unlinkat(arg1, arg2, arg3);
	334	break;
	335
db697887 WL	336	default:
	337	qemu_log_mask(LOG_UNIMP, "Unsupported syscall: %d\n", num);
	338	ret = -TARGET_ENOSYS;
	339	break;
	340	}
	341
	342	return ret;
	343	}
	344
	345	/*
	346	* do_freebsd_syscall() should always have a single exit point at the end so
	347	* that actions, such as logging of syscall results, can be performed. This
	348	* as a wrapper around freebsd_syscall() so that actually happens. Since
	349	* that is a singleton, modern compilers will inline it anyway...
66eed099 WL	350	*/
	351	abi_long do_freebsd_syscall(void *cpu_env, int num, abi_long arg1,
	352	abi_long arg2, abi_long arg3, abi_long arg4,
	353	abi_long arg5, abi_long arg6, abi_long arg7,
	354	abi_long arg8)
	355	{
db697887 WL	356	CPUState *cpu = env_cpu(cpu_env);
	357	int ret;
	358
	359	trace_guest_user_syscall(cpu, num, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8);
	360	if (do_strace) {
	361	print_freebsd_syscall(num, arg1, arg2, arg3, arg4, arg5, arg6);
	362	}
	363
	364	ret = freebsd_syscall(cpu_env, num, arg1, arg2, arg3, arg4, arg5, arg6,
	365	arg7, arg8);
	366	if (do_strace) {
	367	print_freebsd_syscall_ret(num, ret);
	368	}
	369	trace_guest_user_syscall_ret(cpu, num, ret);
	370
	371	return ret;
66eed099 WL	372	}
	373
	374	void syscall_init(void)
	375	{
	376	}