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1 /*
2 * process related system call shims and definitions
3 *
4 * Copyright (c) 2013-2014 Stacey D. Son
5 *
6 * SPDX-License-Identifier: GPL-2.0-or-later
7 */
8 #ifndef BSD_USER_FREEBSD_OS_PROC_H
9 #define BSD_USER_FREEBSD_OS_PROC_H
10
11 #include <sys/param.h>
12 #include <sys/procctl.h>
13 #include <sys/signal.h>
14 #include <sys/procdesc.h>
15 #include <sys/wait.h>
16
17 #include "accel/tcg/cpu-loop.h"
18 #include "target_arch_cpu.h"
19
20 pid_t safe_wait4(pid_t wpid, int *status, int options, struct rusage *rusage);
21 pid_t safe_wait6(idtype_t idtype, id_t id, int *status, int options,
22 struct __wrusage *wrusage, siginfo_t *infop);
23
24 extern int __setugid(int flag);
25
26 /* execve(2) */
27 static inline abi_long do_freebsd_execve(abi_ulong path_or_fd, abi_ulong argp,
28 abi_ulong envp)
29 {
30
31 return freebsd_exec_common(path_or_fd, argp, envp, 0);
32 }
33
34 /* fexecve(2) */
35 static inline abi_long do_freebsd_fexecve(abi_ulong path_or_fd, abi_ulong argp,
36 abi_ulong envp)
37 {
38
39 return freebsd_exec_common(path_or_fd, argp, envp, 1);
40 }
41
42 /* wait4(2) */
43 static inline abi_long do_freebsd_wait4(abi_long arg1, abi_ulong target_status,
44 abi_long arg3, abi_ulong target_rusage)
45 {
46 abi_long ret;
47 int status;
48 struct rusage rusage, *rusage_ptr = NULL;
49
50 if (target_rusage) {
51 rusage_ptr = &rusage;
52 }
53 ret = get_errno(safe_wait4(arg1, &status, arg3, rusage_ptr));
54
55 if (ret < 0) {
56 return ret;
57 }
58 if (target_status != 0) {
59 status = host_to_target_waitstatus(status);
60 if (put_user_s32(status, target_status) != 0) {
61 return -TARGET_EFAULT;
62 }
63 }
64 if (target_rusage != 0) {
65 host_to_target_rusage(target_rusage, &rusage);
66 }
67 return ret;
68 }
69
70 /* wait6(2) */
71 static inline abi_long do_freebsd_wait6(void *cpu_env, abi_long idtype,
72 abi_long id1, abi_long id2,
73 abi_ulong target_status, abi_long options, abi_ulong target_wrusage,
74 abi_ulong target_infop, abi_ulong pad1)
75 {
76 abi_long ret;
77 int status;
78 struct __wrusage wrusage, *wrusage_ptr = NULL;
79 siginfo_t info;
80 void *p;
81
82 if (regpairs_aligned(cpu_env) != 0) {
83 /* printf("shifting args\n"); */
84 /* 64-bit id is aligned, so shift all the arguments over by one */
85 id1 = id2;
86 id2 = target_status;
87 target_status = options;
88 options = target_wrusage;
89 target_wrusage = target_infop;
90 target_infop = pad1;
91 }
92
93 if (target_wrusage) {
94 wrusage_ptr = &wrusage;
95 }
96 ret = get_errno(safe_wait6(idtype, target_arg64(id1, id2),
97 &status, options, wrusage_ptr, &info));
98
99 if (ret < 0) {
100 return ret;
101 }
102 if (target_status != 0) {
103 status = host_to_target_waitstatus(status);
104 if (put_user_s32(status, target_status) != 0) {
105 return -TARGET_EFAULT;
106 }
107 }
108 if (target_wrusage != 0) {
109 host_to_target_wrusage(target_wrusage, &wrusage);
110 }
111 if (target_infop != 0) {
112 p = lock_user(VERIFY_WRITE, target_infop, sizeof(target_siginfo_t), 0);
113 if (p == NULL) {
114 return -TARGET_EFAULT;
115 }
116 host_to_target_siginfo(p, &info);
117 unlock_user(p, target_infop, sizeof(target_siginfo_t));
118 }
119 return ret;
120 }
121
122 /* setloginclass(2) */
123 static inline abi_long do_freebsd_setloginclass(abi_ulong arg1)
124 {
125 abi_long ret;
126 void *p;
127
128 p = lock_user_string(arg1);
129 if (p == NULL) {
130 return -TARGET_EFAULT;
131 }
132 ret = get_errno(setloginclass(p));
133 unlock_user(p, arg1, 0);
134
135 return ret;
136 }
137
138 /* getloginclass(2) */
139 static inline abi_long do_freebsd_getloginclass(abi_ulong arg1, abi_ulong arg2)
140 {
141 abi_long ret;
142 void *p;
143
144 p = lock_user(VERIFY_WRITE, arg1, arg2, 0);
145 if (p == NULL) {
146 return -TARGET_EFAULT;
147 }
148 ret = get_errno(getloginclass(p, arg2));
149 unlock_user(p, arg1, arg2);
150
151 return ret;
152 }
153
154 /* pdgetpid(2) */
155 static inline abi_long do_freebsd_pdgetpid(abi_long fd, abi_ulong target_pidp)
156 {
157 abi_long ret;
158 pid_t pid;
159
160 ret = get_errno(pdgetpid(fd, &pid));
161 if (!is_error(ret)) {
162 if (put_user_u32(pid, target_pidp)) {
163 return -TARGET_EFAULT;
164 }
165 }
166 return ret;
167 }
168
169 /* undocumented __setugid */
170 static inline abi_long do_freebsd___setugid(abi_long arg1)
171 {
172 return -TARGET_ENOSYS;
173 }
174
175 /* fork(2) */
176 static inline abi_long do_freebsd_fork(void *cpu_env)
177 {
178 abi_long ret;
179 abi_ulong child_flag;
180
181 fork_start();
182 ret = fork();
183 if (ret == 0) {
184 /* child */
185 child_flag = 1;
186 target_cpu_clone_regs(cpu_env, 0);
187 } else {
188 /* parent */
189 child_flag = 0;
190 }
191
192 /*
193 * The fork system call sets a child flag in the second return
194 * value: 0 for parent process, 1 for child process.
195 */
196 set_second_rval(cpu_env, child_flag);
197
198 fork_end(ret);
199
200 return ret;
201 }
202
203 /* vfork(2) */
204 static inline abi_long do_freebsd_vfork(void *cpu_env)
205 {
206 return do_freebsd_fork(cpu_env);
207 }
208
209 /* rfork(2) */
210 static inline abi_long do_freebsd_rfork(void *cpu_env, abi_long flags)
211 {
212 abi_long ret;
213 abi_ulong child_flag;
214
215 /*
216 * XXX We need to handle RFMEM here, as well. Neither are safe to execute
217 * as-is on x86 hosts because they'll split memory but not the stack,
218 * wreaking havoc on host architectures that use the stack to store the
219 * return address as both threads try to pop it off. Rejecting RFSPAWN
220 * entirely for now is ok, the only consumer at the moment is posix_spawn
221 * and it will fall back to classic vfork(2) if we return EINVAL.
222 */
223 if ((flags & TARGET_RFSPAWN) != 0) {
224 return -TARGET_EINVAL;
225 }
226 fork_start();
227 ret = rfork(flags);
228 if (ret == 0) {
229 /* child */
230 child_flag = 1;
231 target_cpu_clone_regs(cpu_env, 0);
232 } else {
233 /* parent */
234 child_flag = 0;
235 }
236
237 /*
238 * The fork system call sets a child flag in the second return
239 * value: 0 for parent process, 1 for child process.
240 */
241 set_second_rval(cpu_env, child_flag);
242 fork_end(ret);
243
244 return ret;
245
246 }
247
248 /* pdfork(2) */
249 static inline abi_long do_freebsd_pdfork(void *cpu_env, abi_ulong target_fdp,
250 abi_long flags)
251 {
252 abi_long ret;
253 abi_ulong child_flag;
254 int fd;
255
256 fork_start();
257 ret = pdfork(&fd, flags);
258 if (ret == 0) {
259 /* child */
260 child_flag = 1;
261 target_cpu_clone_regs(cpu_env, 0);
262 } else {
263 /* parent */
264 child_flag = 0;
265 if (put_user_s32(fd, target_fdp)) {
266 return -TARGET_EFAULT;
267 }
268 }
269
270 /*
271 * The fork system call sets a child flag in the second return
272 * value: 0 for parent process, 1 for child process.
273 */
274 set_second_rval(cpu_env, child_flag);
275 fork_end(ret);
276
277 return ret;
278 }
279
280 #endif /* BSD_USER_FREEBSD_OS_PROC_H */