[mirror_qemu.git] / bsd-user / bsd-file.h

/*
 *  file related system call shims and definitions
 *
 *  Copyright (c) 2013 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/>.
 */

#ifndef BSD_FILE_H
#define BSD_FILE_H

#include "qemu/path.h"

#define LOCK_PATH(p, arg)                   \
do {                                        \
    (p) = lock_user_string(arg);            \
    if ((p) == NULL) {                      \
        return -TARGET_EFAULT;              \
    }                                       \
} while (0)

#define UNLOCK_PATH(p, arg)     unlock_user(p, arg, 0)


extern struct iovec *lock_iovec(int type, abi_ulong target_addr, int count,
        int copy);
extern void unlock_iovec(struct iovec *vec, abi_ulong target_addr, int count,
        int copy);

int safe_open(const char *path, int flags, mode_t mode);
int safe_openat(int fd, const char *path, int flags, mode_t mode);

ssize_t safe_read(int fd, void *buf, size_t nbytes);
ssize_t safe_pread(int fd, void *buf, size_t nbytes, off_t offset);
ssize_t safe_readv(int fd, const struct iovec *iov, int iovcnt);
ssize_t safe_preadv(int fd, const struct iovec *iov, int iovcnt, off_t offset);

ssize_t safe_write(int fd, void *buf, size_t nbytes);
ssize_t safe_pwrite(int fd, void *buf, size_t nbytes, off_t offset);
ssize_t safe_writev(int fd, const struct iovec *iov, int iovcnt);
ssize_t safe_pwritev(int fd, const struct iovec *iov, int iovcnt, off_t offset);

/* read(2) */
static abi_long do_bsd_read(abi_long arg1, abi_long arg2, abi_long arg3)
{
    abi_long ret;
    void *p;

    p = lock_user(VERIFY_WRITE, arg2, arg3, 0);
    if (p == NULL) {
        return -TARGET_EFAULT;
    }
    ret = get_errno(safe_read(arg1, p, arg3));
    unlock_user(p, arg2, ret);

    return ret;
}

/* pread(2) */
static abi_long do_bsd_pread(void *cpu_env, abi_long arg1,
    abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5, abi_long arg6)
{
    abi_long ret;
    void *p;

    p = lock_user(VERIFY_WRITE, arg2, arg3, 0);
    if (p == NULL) {
        return -TARGET_EFAULT;
    }
    if (regpairs_aligned(cpu_env) != 0) {
        arg4 = arg5;
        arg5 = arg6;
    }
    ret = get_errno(safe_pread(arg1, p, arg3, target_arg64(arg4, arg5)));
    unlock_user(p, arg2, ret);

    return ret;
}

/* readv(2) */
static abi_long do_bsd_readv(abi_long arg1, abi_long arg2, abi_long arg3)
{
    abi_long ret;
    struct iovec *vec = lock_iovec(VERIFY_WRITE, arg2, arg3, 0);

    if (vec != NULL) {
        ret = get_errno(safe_readv(arg1, vec, arg3));
        unlock_iovec(vec, arg2, arg3, 1);
    } else {
        ret = -host_to_target_errno(errno);
    }

    return ret;
}

/* preadv(2) */
static abi_long do_bsd_preadv(void *cpu_env, abi_long arg1,
    abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5, abi_long arg6)
{
    abi_long ret;
    struct iovec *vec = lock_iovec(VERIFY_WRITE, arg2, arg3, 1);

    if (vec != NULL) {
        if (regpairs_aligned(cpu_env) != 0) {
            arg4 = arg5;
            arg5 = arg6;
        }
        ret = get_errno(safe_preadv(arg1, vec, arg3, target_arg64(arg4, arg5)));
        unlock_iovec(vec, arg2, arg3, 0);
    } else {
        ret = -host_to_target_errno(errno);
    }

    return ret;
}

/* write(2) */
static abi_long do_bsd_write(abi_long arg1, abi_long arg2, abi_long arg3)
{
    abi_long nbytes, ret;
    void *p;

    /* nbytes < 0 implies that it was larger than SIZE_MAX. */
    nbytes = arg3;
    if (nbytes < 0) {
        return -TARGET_EINVAL;
    }
    p = lock_user(VERIFY_READ, arg2, nbytes, 1);
    if (p == NULL) {
        return -TARGET_EFAULT;
    }
    ret = get_errno(safe_write(arg1, p, arg3));
    unlock_user(p, arg2, 0);

    return ret;
}

/* pwrite(2) */
static abi_long do_bsd_pwrite(void *cpu_env, abi_long arg1,
    abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5, abi_long arg6)
{
    abi_long ret;
    void *p;

    p = lock_user(VERIFY_READ, arg2, arg3, 1);
    if (p == NULL) {
        return -TARGET_EFAULT;
    }
    if (regpairs_aligned(cpu_env) != 0) {
        arg4 = arg5;
        arg5 = arg6;
    }
    ret = get_errno(safe_pwrite(arg1, p, arg3, target_arg64(arg4, arg5)));
    unlock_user(p, arg2, 0);

    return ret;
}

/* writev(2) */
static abi_long do_bsd_writev(abi_long arg1, abi_long arg2, abi_long arg3)
{
    abi_long ret;
    struct iovec *vec = lock_iovec(VERIFY_READ, arg2, arg3, 1);

    if (vec != NULL) {
        ret = get_errno(safe_writev(arg1, vec, arg3));
        unlock_iovec(vec, arg2, arg3, 0);
    } else {
        ret = -host_to_target_errno(errno);
    }

    return ret;
}

/* pwritev(2) */
static abi_long do_bsd_pwritev(void *cpu_env, abi_long arg1,
    abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5, abi_long arg6)
{
    abi_long ret;
    struct iovec *vec = lock_iovec(VERIFY_READ, arg2, arg3, 1);

    if (vec != NULL) {
        if (regpairs_aligned(cpu_env) != 0) {
            arg4 = arg5;
            arg5 = arg6;
        }
        ret = get_errno(safe_pwritev(arg1, vec, arg3, target_arg64(arg4, arg5)));
        unlock_iovec(vec, arg2, arg3, 0);
    } else {
        ret = -host_to_target_errno(errno);
    }

    return ret;
}

/* open(2) */
static abi_long do_bsd_open(abi_long arg1, abi_long arg2, abi_long arg3)
{
    abi_long ret;
    void *p;

    LOCK_PATH(p, arg1);
    ret = get_errno(safe_open(path(p), target_to_host_bitmask(arg2,
                fcntl_flags_tbl), arg3));
    UNLOCK_PATH(p, arg1);

    return ret;
}

/* openat(2) */
static abi_long do_bsd_openat(abi_long arg1, abi_long arg2,
        abi_long arg3, abi_long arg4)
{
    abi_long ret;
    void *p;

    LOCK_PATH(p, arg2);
    ret = get_errno(safe_openat(arg1, path(p),
                target_to_host_bitmask(arg3, fcntl_flags_tbl), arg4));
    UNLOCK_PATH(p, arg2);

    return ret;
}

/* close(2) */
static inline abi_long do_bsd_close(abi_long arg1)
{
    return get_errno(close(arg1));
}

/* fdatasync(2) */
static abi_long do_bsd_fdatasync(abi_long arg1)
{
    return get_errno(fdatasync(arg1));
}

/* fsync(2) */
static abi_long do_bsd_fsync(abi_long arg1)
{
    return get_errno(fsync(arg1));
}

/* closefrom(2) */
static abi_long do_bsd_closefrom(abi_long arg1)
{
    closefrom(arg1);  /* returns void */
    return get_errno(0);
}

/* revoke(2) */
static abi_long do_bsd_revoke(abi_long arg1)
{
    abi_long ret;
    void *p;

    LOCK_PATH(p, arg1);
    ret = get_errno(revoke(p)); /* XXX path(p)? */
    UNLOCK_PATH(p, arg1);

    return ret;
}

/* access(2) */
static abi_long do_bsd_access(abi_long arg1, abi_long arg2)
{
    abi_long ret;
    void *p;

    LOCK_PATH(p, arg1);
    ret = get_errno(access(path(p), arg2));
    UNLOCK_PATH(p, arg1);

    return ret;
}

/* eaccess(2) */
static abi_long do_bsd_eaccess(abi_long arg1, abi_long arg2)
{
    abi_long ret;
    void *p;

    LOCK_PATH(p, arg1);
    ret = get_errno(eaccess(path(p), arg2));
    UNLOCK_PATH(p, arg1);

    return ret;
}

/* faccessat(2) */
static abi_long do_bsd_faccessat(abi_long arg1, abi_long arg2,
        abi_long arg3, abi_long arg4)
{
    abi_long ret;
    void *p;

    LOCK_PATH(p, arg2);
    ret = get_errno(faccessat(arg1, p, arg3, arg4)); /* XXX path(p)? */
    UNLOCK_PATH(p, arg2);

    return ret;
}

/* chdir(2) */
static abi_long do_bsd_chdir(abi_long arg1)
{
    abi_long ret;
    void *p;

    LOCK_PATH(p, arg1);
    ret = get_errno(chdir(p)); /* XXX  path(p)? */
    UNLOCK_PATH(p, arg1);

    return ret;
}

/* fchdir(2) */
static abi_long do_bsd_fchdir(abi_long arg1)
{
    return get_errno(fchdir(arg1));
}

#endif /* BSD_FILE_H */
Commit	Line	Data
c5c84d16 WL	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
9c092804 MA	20	#ifndef BSD_FILE_H
9c092804 MA	21	#define BSD_FILE_H
c5c84d16 WL	22
	23	#include "qemu/path.h"
	24
77d3522b WL	25	#define LOCK_PATH(p, arg) \
	26	do { \
	27	(p) = lock_user_string(arg); \
	28	if ((p) == NULL) { \
	29	return -TARGET_EFAULT; \
	30	} \
	31	} while (0)
	32
	33	#define UNLOCK_PATH(p, arg) unlock_user(p, arg, 0)
	34
	35
c5c84d16 WL	36	extern struct iovec *lock_iovec(int type, abi_ulong target_addr, int count,
	37	int copy);
	38	extern void unlock_iovec(struct iovec *vec, abi_ulong target_addr, int count,
	39	int copy);
	40
77d3522b WL	41	int safe_open(const char *path, int flags, mode_t mode);
	42	int safe_openat(int fd, const char *path, int flags, mode_t mode);
	43
80da1b00 WL	44	ssize_t safe_read(int fd, void *buf, size_t nbytes);
	45	ssize_t safe_pread(int fd, void *buf, size_t nbytes, off_t offset);
	46	ssize_t safe_readv(int fd, const struct iovec *iov, int iovcnt);
	47	ssize_t safe_preadv(int fd, const struct iovec *iov, int iovcnt, off_t offset);
	48
770d8aba WL	49	ssize_t safe_write(int fd, void *buf, size_t nbytes);
	50	ssize_t safe_pwrite(int fd, void *buf, size_t nbytes, off_t offset);
	51	ssize_t safe_writev(int fd, const struct iovec *iov, int iovcnt);
	52	ssize_t safe_pwritev(int fd, const struct iovec *iov, int iovcnt, off_t offset);
	53
80da1b00 WL	54	/* read(2) */
	55	static abi_long do_bsd_read(abi_long arg1, abi_long arg2, abi_long arg3)
	56	{
	57	abi_long ret;
	58	void *p;
	59
	60	p = lock_user(VERIFY_WRITE, arg2, arg3, 0);
	61	if (p == NULL) {
	62	return -TARGET_EFAULT;
	63	}
	64	ret = get_errno(safe_read(arg1, p, arg3));
	65	unlock_user(p, arg2, ret);
	66
	67	return ret;
	68	}
	69
	70	/* pread(2) */
	71	static abi_long do_bsd_pread(void *cpu_env, abi_long arg1,
	72	abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5, abi_long arg6)
	73	{
	74	abi_long ret;
	75	void *p;
	76
	77	p = lock_user(VERIFY_WRITE, arg2, arg3, 0);
	78	if (p == NULL) {
	79	return -TARGET_EFAULT;
	80	}
	81	if (regpairs_aligned(cpu_env) != 0) {
	82	arg4 = arg5;
	83	arg5 = arg6;
	84	}
	85	ret = get_errno(safe_pread(arg1, p, arg3, target_arg64(arg4, arg5)));
	86	unlock_user(p, arg2, ret);
	87
	88	return ret;
	89	}
	90
	91	/* readv(2) */
	92	static abi_long do_bsd_readv(abi_long arg1, abi_long arg2, abi_long arg3)
	93	{
	94	abi_long ret;
	95	struct iovec *vec = lock_iovec(VERIFY_WRITE, arg2, arg3, 0);
	96
	97	if (vec != NULL) {
	98	ret = get_errno(safe_readv(arg1, vec, arg3));
	99	unlock_iovec(vec, arg2, arg3, 1);
	100	} else {
	101	ret = -host_to_target_errno(errno);
	102	}
	103
	104	return ret;
	105	}
	106
	107	/* preadv(2) */
	108	static abi_long do_bsd_preadv(void *cpu_env, abi_long arg1,
	109	abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5, abi_long arg6)
	110	{
	111	abi_long ret;
	112	struct iovec *vec = lock_iovec(VERIFY_WRITE, arg2, arg3, 1);
	113
	114	if (vec != NULL) {
	115	if (regpairs_aligned(cpu_env) != 0) {
	116	arg4 = arg5;
	117	arg5 = arg6;
118	}
119	ret = get_errno(safe_preadv(arg1, vec, arg3, target_arg64(arg4, arg5)));
120	unlock_iovec(vec, arg2, arg3, 0);
121	} else {
122	ret = -host_to_target_errno(errno);
123	}
124
125	return ret;
126	}
127
770d8aba WL	128	/* write(2) */
	129	static abi_long do_bsd_write(abi_long arg1, abi_long arg2, abi_long arg3)
	130	{
	131	abi_long nbytes, ret;
	132	void *p;
	133
	134	/* nbytes < 0 implies that it was larger than SIZE_MAX. */
	135	nbytes = arg3;
	136	if (nbytes < 0) {
	137	return -TARGET_EINVAL;
	138	}
	139	p = lock_user(VERIFY_READ, arg2, nbytes, 1);
	140	if (p == NULL) {
	141	return -TARGET_EFAULT;
	142	}
	143	ret = get_errno(safe_write(arg1, p, arg3));
	144	unlock_user(p, arg2, 0);
	145
	146	return ret;
	147	}
	148
	149	/* pwrite(2) */
	150	static abi_long do_bsd_pwrite(void *cpu_env, abi_long arg1,
	151	abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5, abi_long arg6)
	152	{
	153	abi_long ret;
	154	void *p;
	155
	156	p = lock_user(VERIFY_READ, arg2, arg3, 1);
	157	if (p == NULL) {
	158	return -TARGET_EFAULT;
	159	}
	160	if (regpairs_aligned(cpu_env) != 0) {
	161	arg4 = arg5;
	162	arg5 = arg6;
	163	}
	164	ret = get_errno(safe_pwrite(arg1, p, arg3, target_arg64(arg4, arg5)));
	165	unlock_user(p, arg2, 0);
	166
	167	return ret;
	168	}
	169
	170	/* writev(2) */
	171	static abi_long do_bsd_writev(abi_long arg1, abi_long arg2, abi_long arg3)
	172	{
	173	abi_long ret;
	174	struct iovec *vec = lock_iovec(VERIFY_READ, arg2, arg3, 1);
	175
	176	if (vec != NULL) {
	177	ret = get_errno(safe_writev(arg1, vec, arg3));
	178	unlock_iovec(vec, arg2, arg3, 0);
	179	} else {
	180	ret = -host_to_target_errno(errno);
	181	}
	182
	183	return ret;
	184	}
	185
	186	/* pwritev(2) */
	187	static abi_long do_bsd_pwritev(void *cpu_env, abi_long arg1,
	188	abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5, abi_long arg6)
	189	{
	190	abi_long ret;
	191	struct iovec *vec = lock_iovec(VERIFY_READ, arg2, arg3, 1);
192
193	if (vec != NULL) {
194	if (regpairs_aligned(cpu_env) != 0) {
195	arg4 = arg5;
196	arg5 = arg6;
197	}
198	ret = get_errno(safe_pwritev(arg1, vec, arg3, target_arg64(arg4, arg5)));
199	unlock_iovec(vec, arg2, arg3, 0);
200	} else {
201	ret = -host_to_target_errno(errno);
202	}
203
204	return ret;
205	}
206
77d3522b WL	207	/* open(2) */
	208	static abi_long do_bsd_open(abi_long arg1, abi_long arg2, abi_long arg3)
	209	{
	210	abi_long ret;
	211	void *p;
	212
	213	LOCK_PATH(p, arg1);
	214	ret = get_errno(safe_open(path(p), target_to_host_bitmask(arg2,
	215	fcntl_flags_tbl), arg3));
	216	UNLOCK_PATH(p, arg1);
	217
	218	return ret;
	219	}
	220
	221	/* openat(2) */
	222	static abi_long do_bsd_openat(abi_long arg1, abi_long arg2,
	223	abi_long arg3, abi_long arg4)
	224	{
	225	abi_long ret;
	226	void *p;
	227
	228	LOCK_PATH(p, arg2);
	229	ret = get_errno(safe_openat(arg1, path(p),
	230	target_to_host_bitmask(arg3, fcntl_flags_tbl), arg4));
	231	UNLOCK_PATH(p, arg2);
	232
	233	return ret;
	234	}
	235
	236	/* close(2) */
	237	static inline abi_long do_bsd_close(abi_long arg1)
	238	{
	239	return get_errno(close(arg1));
	240	}
	241
a2ba6c7b WL	242	/* fdatasync(2) */
	243	static abi_long do_bsd_fdatasync(abi_long arg1)
	244	{
	245	return get_errno(fdatasync(arg1));
	246	}
	247
	248	/* fsync(2) */
	249	static abi_long do_bsd_fsync(abi_long arg1)
	250	{
	251	return get_errno(fsync(arg1));
	252	}
	253
	254	/* closefrom(2) */
	255	static abi_long do_bsd_closefrom(abi_long arg1)
	256	{
	257	closefrom(arg1); /* returns void */
	258	return get_errno(0);
	259	}
	260
65c6c4c8 WL	261	/* revoke(2) */
	262	static abi_long do_bsd_revoke(abi_long arg1)
	263	{
	264	abi_long ret;
	265	void *p;
	266
	267	LOCK_PATH(p, arg1);
	268	ret = get_errno(revoke(p)); /* XXX path(p)? */
	269	UNLOCK_PATH(p, arg1);
	270
	271	return ret;
	272	}
	273
	274	/* access(2) */
	275	static abi_long do_bsd_access(abi_long arg1, abi_long arg2)
	276	{
	277	abi_long ret;
	278	void *p;
	279
	280	LOCK_PATH(p, arg1);
	281	ret = get_errno(access(path(p), arg2));
	282	UNLOCK_PATH(p, arg1);
	283
	284	return ret;
	285	}
	286
	287	/* eaccess(2) */
	288	static abi_long do_bsd_eaccess(abi_long arg1, abi_long arg2)
	289	{
	290	abi_long ret;
	291	void *p;
	292
	293	LOCK_PATH(p, arg1);
	294	ret = get_errno(eaccess(path(p), arg2));
	295	UNLOCK_PATH(p, arg1);
	296
	297	return ret;
	298	}
	299
	300	/* faccessat(2) */
	301	static abi_long do_bsd_faccessat(abi_long arg1, abi_long arg2,
	302	abi_long arg3, abi_long arg4)
	303	{
	304	abi_long ret;
	305	void *p;
	306
	307	LOCK_PATH(p, arg2);
	308	ret = get_errno(faccessat(arg1, p, arg3, arg4)); /* XXX path(p)? */
	309	UNLOCK_PATH(p, arg2);
	310
	311	return ret;
	312	}
	313
390f547e WL	314	/* chdir(2) */
	315	static abi_long do_bsd_chdir(abi_long arg1)
	316	{
	317	abi_long ret;
	318	void *p;
	319
	320	LOCK_PATH(p, arg1);
	321	ret = get_errno(chdir(p)); /* XXX path(p)? */
	322	UNLOCK_PATH(p, arg1);
	323
	324	return ret;
	325	}
	326
	327	/* fchdir(2) */
	328	static abi_long do_bsd_fchdir(abi_long arg1)
	329	{
	330	return get_errno(fchdir(arg1));
	331	}
	332
9c092804	333	#endif /* BSD_FILE_H */