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/*
* 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));
}
#endif /* BSD_FILE_H */
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