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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 WL |
43 | #include "bsd-file.h" |
44 | ||
66eed099 WL |
45 | void target_set_brk(abi_ulong new_brk) |
46 | { | |
47 | } | |
48 | ||
deeff83b WL |
49 | /* |
50 | * errno conversion. | |
51 | */ | |
52 | abi_long get_errno(abi_long ret) | |
66eed099 | 53 | { |
deeff83b WL |
54 | if (ret == -1) { |
55 | return -host_to_target_errno(errno); | |
56 | } else { | |
57 | return ret; | |
58 | } | |
59 | } | |
66eed099 | 60 | |
deeff83b WL |
61 | int host_to_target_errno(int err) |
62 | { | |
63 | /* | |
64 | * All the BSDs have the property that the error numbers are uniform across | |
65 | * all architectures for a given BSD, though they may vary between different | |
66 | * BSDs. | |
67 | */ | |
68 | return err; | |
69 | } | |
70 | ||
71 | bool is_error(abi_long ret) | |
72 | { | |
66eed099 WL |
73 | return (abi_ulong)ret >= (abi_ulong)(-4096); |
74 | } | |
75 | ||
1ed771b2 WL |
76 | /* |
77 | * Unlocks a iovec. Unlike unlock_iovec, it assumes the tvec array itself is | |
78 | * already locked from target_addr. It will be unlocked as well as all the iovec | |
79 | * elements. | |
80 | */ | |
81 | static void helper_unlock_iovec(struct target_iovec *target_vec, | |
82 | abi_ulong target_addr, struct iovec *vec, | |
83 | int count, int copy) | |
84 | { | |
85 | for (int i = 0; i < count; i++) { | |
86 | abi_ulong base = tswapal(target_vec[i].iov_base); | |
87 | ||
88 | if (vec[i].iov_base) { | |
89 | unlock_user(vec[i].iov_base, base, copy ? vec[i].iov_len : 0); | |
90 | } | |
91 | } | |
92 | unlock_user(target_vec, target_addr, 0); | |
93 | } | |
94 | ||
95 | struct iovec *lock_iovec(int type, abi_ulong target_addr, | |
96 | int count, int copy) | |
97 | { | |
98 | struct target_iovec *target_vec; | |
99 | struct iovec *vec; | |
100 | abi_ulong total_len, max_len; | |
101 | int i; | |
102 | int err = 0; | |
103 | ||
104 | if (count == 0) { | |
105 | errno = 0; | |
106 | return NULL; | |
107 | } | |
108 | if (count < 0 || count > IOV_MAX) { | |
109 | errno = EINVAL; | |
110 | return NULL; | |
111 | } | |
112 | ||
113 | vec = g_try_new0(struct iovec, count); | |
114 | if (vec == NULL) { | |
115 | errno = ENOMEM; | |
116 | return NULL; | |
117 | } | |
118 | ||
119 | target_vec = lock_user(VERIFY_READ, target_addr, | |
120 | count * sizeof(struct target_iovec), 1); | |
121 | if (target_vec == NULL) { | |
122 | err = EFAULT; | |
123 | goto fail2; | |
124 | } | |
125 | ||
126 | max_len = 0x7fffffff & MIN(TARGET_PAGE_MASK, PAGE_MASK); | |
127 | total_len = 0; | |
128 | ||
129 | for (i = 0; i < count; i++) { | |
130 | abi_ulong base = tswapal(target_vec[i].iov_base); | |
131 | abi_long len = tswapal(target_vec[i].iov_len); | |
132 | ||
133 | if (len < 0) { | |
134 | err = EINVAL; | |
135 | goto fail; | |
136 | } else if (len == 0) { | |
137 | /* Zero length pointer is ignored. */ | |
138 | vec[i].iov_base = 0; | |
139 | } else { | |
140 | vec[i].iov_base = lock_user(type, base, len, copy); | |
141 | /* | |
142 | * If the first buffer pointer is bad, this is a fault. But | |
143 | * subsequent bad buffers will result in a partial write; this is | |
144 | * realized by filling the vector with null pointers and zero | |
145 | * lengths. | |
146 | */ | |
147 | if (!vec[i].iov_base) { | |
148 | if (i == 0) { | |
149 | err = EFAULT; | |
150 | goto fail; | |
151 | } else { | |
152 | /* | |
153 | * Fail all the subsequent addresses, they are already | |
154 | * zero'd. | |
155 | */ | |
156 | goto out; | |
157 | } | |
158 | } | |
159 | if (len > max_len - total_len) { | |
160 | len = max_len - total_len; | |
161 | } | |
162 | } | |
163 | vec[i].iov_len = len; | |
164 | total_len += len; | |
165 | } | |
166 | out: | |
167 | unlock_user(target_vec, target_addr, 0); | |
168 | return vec; | |
169 | ||
170 | fail: | |
171 | helper_unlock_iovec(target_vec, target_addr, vec, i, copy); | |
172 | fail2: | |
173 | g_free(vec); | |
174 | errno = err; | |
175 | return NULL; | |
176 | } | |
177 | ||
883808d8 WL |
178 | void unlock_iovec(struct iovec *vec, abi_ulong target_addr, |
179 | int count, int copy) | |
180 | { | |
181 | struct target_iovec *target_vec; | |
182 | ||
183 | target_vec = lock_user(VERIFY_READ, target_addr, | |
184 | count * sizeof(struct target_iovec), 1); | |
185 | if (target_vec) { | |
186 | helper_unlock_iovec(target_vec, target_addr, vec, count, copy); | |
187 | } | |
188 | ||
189 | g_free(vec); | |
190 | } | |
191 | ||
66eed099 WL |
192 | /* |
193 | * do_syscall() should always have a single exit point at the end so that | |
194 | * actions, such as logging of syscall results, can be performed. All errnos | |
195 | * that do_syscall() returns must be -TARGET_<errcode>. | |
196 | */ | |
197 | abi_long do_freebsd_syscall(void *cpu_env, int num, abi_long arg1, | |
198 | abi_long arg2, abi_long arg3, abi_long arg4, | |
199 | abi_long arg5, abi_long arg6, abi_long arg7, | |
200 | abi_long arg8) | |
201 | { | |
202 | return 0; | |
203 | } | |
204 | ||
205 | void syscall_init(void) | |
206 | { | |
207 | } |