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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 |
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 | ||
9c092804 | 242 | #endif /* BSD_FILE_H */ |