1 /*
2 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Licensed under the GPL
4 */
5
6 #ifndef __OS_H__
7 #define __OS_H__
8
9 #include <stdarg.h>
10 #include "irq_user.h"
11 #include "longjmp.h"
12 #include "mm_id.h"
13 #include "sysdep/tls.h"
14
15 #define CATCH_EINTR(expr) while ((errno = 0, ((expr) < 0)) && (errno == EINTR))
16
17 #define OS_TYPE_FILE 1
18 #define OS_TYPE_DIR 2
19 #define OS_TYPE_SYMLINK 3
20 #define OS_TYPE_CHARDEV 4
21 #define OS_TYPE_BLOCKDEV 5
22 #define OS_TYPE_FIFO 6
23 #define OS_TYPE_SOCK 7
24
25 /* os_access() flags */
26 #define OS_ACC_F_OK 0 /* Test for existence. */
27 #define OS_ACC_X_OK 1 /* Test for execute permission. */
28 #define OS_ACC_W_OK 2 /* Test for write permission. */
29 #define OS_ACC_R_OK 4 /* Test for read permission. */
30 #define OS_ACC_RW_OK (OS_ACC_W_OK | OS_ACC_R_OK) /* Test for RW permission */
31
32 /*
33 * types taken from stat_file() in hostfs_user.c
34 * (if they are wrong here, they are wrong there...).
35 */
36 struct uml_stat {
37 int ust_dev; /* device */
38 unsigned long long ust_ino; /* inode */
39 int ust_mode; /* protection */
40 int ust_nlink; /* number of hard links */
41 int ust_uid; /* user ID of owner */
42 int ust_gid; /* group ID of owner */
43 unsigned long long ust_size; /* total size, in bytes */
44 int ust_blksize; /* blocksize for filesystem I/O */
45 unsigned long long ust_blocks; /* number of blocks allocated */
46 unsigned long ust_atime; /* time of last access */
47 unsigned long ust_mtime; /* time of last modification */
48 unsigned long ust_ctime; /* time of last change */
49 };
50
51 struct openflags {
52 unsigned int r : 1;
53 unsigned int w : 1;
54 unsigned int s : 1; /* O_SYNC */
55 unsigned int c : 1; /* O_CREAT */
56 unsigned int t : 1; /* O_TRUNC */
57 unsigned int a : 1; /* O_APPEND */
58 unsigned int e : 1; /* O_EXCL */
59 unsigned int cl : 1; /* FD_CLOEXEC */
60 };
61
62 #define OPENFLAGS() ((struct openflags) { .r = 0, .w = 0, .s = 0, .c = 0, \
63 .t = 0, .a = 0, .e = 0, .cl = 0 })
64
65 static inline struct openflags of_read(struct openflags flags)
66 {
67 flags.r = 1;
68 return flags;
69 }
70
71 static inline struct openflags of_write(struct openflags flags)
72 {
73 flags.w = 1;
74 return flags;
75 }
76
77 static inline struct openflags of_rdwr(struct openflags flags)
78 {
79 return of_read(of_write(flags));
80 }
81
82 static inline struct openflags of_set_rw(struct openflags flags, int r, int w)
83 {
84 flags.r = r;
85 flags.w = w;
86 return flags;
87 }
88
89 static inline struct openflags of_sync(struct openflags flags)
90 {
91 flags.s = 1;
92 return flags;
93 }
94
95 static inline struct openflags of_create(struct openflags flags)
96 {
97 flags.c = 1;
98 return flags;
99 }
100
101 static inline struct openflags of_trunc(struct openflags flags)
102 {
103 flags.t = 1;
104 return flags;
105 }
106
107 static inline struct openflags of_append(struct openflags flags)
108 {
109 flags.a = 1;
110 return flags;
111 }
112
113 static inline struct openflags of_excl(struct openflags flags)
114 {
115 flags.e = 1;
116 return flags;
117 }
118
119 static inline struct openflags of_cloexec(struct openflags flags)
120 {
121 flags.cl = 1;
122 return flags;
123 }
124
125 /* file.c */
126 extern int os_stat_file(const char *file_name, struct uml_stat *buf);
127 extern int os_stat_fd(const int fd, struct uml_stat *buf);
128 extern int os_access(const char *file, int mode);
129 extern int os_set_exec_close(int fd);
130 extern int os_ioctl_generic(int fd, unsigned int cmd, unsigned long arg);
131 extern int os_get_ifname(int fd, char *namebuf);
132 extern int os_set_slip(int fd);
133 extern int os_mode_fd(int fd, int mode);
134
135 extern int os_seek_file(int fd, unsigned long long offset);
136 extern int os_open_file(const char *file, struct openflags flags, int mode);
137 extern int os_read_file(int fd, void *buf, int len);
138 extern int os_write_file(int fd, const void *buf, int count);
139 extern int os_file_size(const char *file, unsigned long long *size_out);
140 extern int os_file_modtime(const char *file, unsigned long *modtime);
141 extern int os_pipe(int *fd, int stream, int close_on_exec);
142 extern int os_set_fd_async(int fd);
143 extern int os_clear_fd_async(int fd);
144 extern int os_set_fd_block(int fd, int blocking);
145 extern int os_accept_connection(int fd);
146 extern int os_create_unix_socket(const char *file, int len, int close_on_exec);
147 extern int os_shutdown_socket(int fd, int r, int w);
148 extern void os_close_file(int fd);
149 extern int os_rcv_fd(int fd, int *helper_pid_out);
150 extern int create_unix_socket(char *file, int len, int close_on_exec);
151 extern int os_connect_socket(const char *name);
152 extern int os_file_type(char *file);
153 extern int os_file_mode(const char *file, struct openflags *mode_out);
154 extern int os_lock_file(int fd, int excl);
155 extern void os_flush_stdout(void);
156 extern int os_stat_filesystem(char *path, long *bsize_out,
157 long long *blocks_out, long long *bfree_out,
158 long long *bavail_out, long long *files_out,
159 long long *ffree_out, void *fsid_out,
160 int fsid_size, long *namelen_out,
161 long *spare_out);
162 extern int os_change_dir(char *dir);
163 extern int os_fchange_dir(int fd);
164
165 /* start_up.c */
166 extern void os_early_checks(void);
167 extern void can_do_skas(void);
168 extern void os_check_bugs(void);
169 extern void check_host_supports_tls(int *supports_tls, int *tls_min);
170
171 /* mem.c */
172 extern int create_mem_file(unsigned long long len);
173
174 /* process.c */
175 extern unsigned long os_process_pc(int pid);
176 extern int os_process_parent(int pid);
177 extern void os_stop_process(int pid);
178 extern void os_kill_process(int pid, int reap_child);
179 extern void os_kill_ptraced_process(int pid, int reap_child);
180 extern long os_ptrace_ldt(long pid, long addr, long data);
181
182 extern int os_getpid(void);
183 extern int os_getpgrp(void);
184
185 extern void init_new_thread_signals(void);
186 extern int run_kernel_thread(int (*fn)(void *), void *arg, jmp_buf **jmp_ptr);
187
188 extern int os_map_memory(void *virt, int fd, unsigned long long off,
189 unsigned long len, int r, int w, int x);
190 extern int os_protect_memory(void *addr, unsigned long len,
191 int r, int w, int x);
192 extern int os_unmap_memory(void *addr, int len);
193 extern int os_drop_memory(void *addr, int length);
194 extern int can_drop_memory(void);
195 extern void os_flush_stdout(void);
196
197 /* uaccess.c */
198 extern unsigned long __do_user_copy(void *to, const void *from, int n,
199 void **fault_addr, jmp_buf **fault_catcher,
200 void (*op)(void *to, const void *from,
201 int n), int *faulted_out);
202
203 /* execvp.c */
204 extern int execvp_noalloc(char *buf, const char *file, char *const argv[]);
205 /* helper.c */
206 extern int run_helper(void (*pre_exec)(void *), void *pre_data, char **argv);
207 extern int run_helper_thread(int (*proc)(void *), void *arg,
208 unsigned int flags, unsigned long *stack_out);
209 extern int helper_wait(int pid);
210
211
212 /* tls.c */
213 extern int os_set_thread_area(user_desc_t *info, int pid);
214 extern int os_get_thread_area(user_desc_t *info, int pid);
215
216 /* umid.c */
217 extern int umid_file_name(char *name, char *buf, int len);
218 extern int set_umid(char *name);
219 extern char *get_umid(void);
220
221 /* signal.c */
222 extern void timer_init(void);
223 extern void set_sigstack(void *sig_stack, int size);
224 extern void remove_sigstack(void);
225 extern void set_handler(int sig, void (*handler)(int), int flags, ...);
226 extern int change_sig(int signal, int on);
227 extern void block_signals(void);
228 extern void unblock_signals(void);
229 extern int get_signals(void);
230 extern int set_signals(int enable);
231
232 /* util.c */
233 extern void stack_protections(unsigned long address);
234 extern int raw(int fd);
235 extern void setup_machinename(char *machine_out);
236 extern void setup_hostinfo(char *buf, int len);
237 extern void os_dump_core(void) __attribute__ ((noreturn));
238
239 /* time.c */
240 extern void idle_sleep(unsigned long long nsecs);
241 extern int set_interval(void);
242 extern int timer_one_shot(int ticks);
243 extern long long disable_timer(void);
244 extern void uml_idle_timer(void);
245 extern long long os_nsecs(void);
246
247 /* skas/mem.c */
248 extern long run_syscall_stub(struct mm_id * mm_idp,
249 int syscall, unsigned long *args, long expected,
250 void **addr, int done);
251 extern long syscall_stub_data(struct mm_id * mm_idp,
252 unsigned long *data, int data_count,
253 void **addr, void **stub_addr);
254 extern int map(struct mm_id * mm_idp, unsigned long virt,
255 unsigned long len, int prot, int phys_fd,
256 unsigned long long offset, int done, void **data);
257 extern int unmap(struct mm_id * mm_idp, unsigned long addr, unsigned long len,
258 int done, void **data);
259 extern int protect(struct mm_id * mm_idp, unsigned long addr,
260 unsigned long len, unsigned int prot, int done, void **data);
261
262 /* skas/process.c */
263 extern int is_skas_winch(int pid, int fd, void *data);
264 extern int start_userspace(unsigned long stub_stack);
265 extern int copy_context_skas0(unsigned long stack, int pid);
266 extern void userspace(struct uml_pt_regs *regs);
267 extern int map_stub_pages(int fd, unsigned long code, unsigned long data,
268 unsigned long stack);
269 extern void new_thread(void *stack, jmp_buf *buf, void (*handler)(void));
270 extern void switch_threads(jmp_buf *me, jmp_buf *you);
271 extern int start_idle_thread(void *stack, jmp_buf *switch_buf);
272 extern void initial_thread_cb_skas(void (*proc)(void *),
273 void *arg);
274 extern void halt_skas(void);
275 extern void reboot_skas(void);
276
277 /* irq.c */
278 extern int os_waiting_for_events(struct irq_fd *active_fds);
279 extern int os_create_pollfd(int fd, int events, void *tmp_pfd, int size_tmpfds);
280 extern void os_free_irq_by_cb(int (*test)(struct irq_fd *, void *), void *arg,
281 struct irq_fd *active_fds, struct irq_fd ***last_irq_ptr2);
282 extern void os_free_irq_later(struct irq_fd *active_fds,
283 int irq, void *dev_id);
284 extern int os_get_pollfd(int i);
285 extern void os_set_pollfd(int i, int fd);
286 extern void os_set_ioignore(void);
287
288 /* sigio.c */
289 extern int add_sigio_fd(int fd);
290 extern int ignore_sigio_fd(int fd);
291 extern void maybe_sigio_broken(int fd, int read);
292 extern void sigio_broken(int fd, int read);
293
294 /* sys-x86_64/prctl.c */
295 extern int os_arch_prctl(int pid, int code, unsigned long *addr);
296
297 /* tty.c */
298 extern int get_pty(void);
299
300 /* sys-$ARCH/task_size.c */
301 extern unsigned long os_get_top_address(void);
302
303 #endif
304
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