arch/um/include/shared/os.h

   1 /*
   2  * Copyright (C) 2015 Anton Ivanov (aivanov@{brocade.com,kot-begemot.co.uk})
   3  * Copyright (C) 2015 Thomas Meyer (thomas@m3y3r.de)
   4  * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
   5  * Licensed under the GPL
   6  */
   7
   8 #ifndef __OS_H__
   9 #define __OS_H__
  10
  11 #include <stdarg.h>
  12 #include <irq_user.h>
  13 #include <longjmp.h>
  14 #include <mm_id.h>
  15
  16 #define CATCH_EINTR(expr) while ((errno = 0, ((expr) < 0)) && (errno == EINTR))
  17
  18 #define OS_TYPE_FILE 1
  19 #define OS_TYPE_DIR 2
  20 #define OS_TYPE_SYMLINK 3
  21 #define OS_TYPE_CHARDEV 4
  22 #define OS_TYPE_BLOCKDEV 5
  23 #define OS_TYPE_FIFO 6
  24 #define OS_TYPE_SOCK 7
  25
  26 /* os_access() flags */
  27 #define OS_ACC_F_OK    0       /* Test for existence.  */
  28 #define OS_ACC_X_OK    1       /* Test for execute permission.  */
  29 #define OS_ACC_W_OK    2       /* Test for write permission.  */
  30 #define OS_ACC_R_OK    4       /* Test for read permission.  */
  31 #define OS_ACC_RW_OK   (OS_ACC_W_OK | OS_ACC_R_OK) /* Test for RW permission */
  32
  33 #ifdef CONFIG_64BIT
  34 #define OS_LIB_PATH     "/usr/lib64/"
  35 #else
  36 #define OS_LIB_PATH     "/usr/lib/"
  37 #endif
  38
  39 /*
  40  * types taken from stat_file() in hostfs_user.c
  41  * (if they are wrong here, they are wrong there...).
  42  */
  43 struct uml_stat {
  44         int                ust_dev;        /* device */
  45         unsigned long long ust_ino;        /* inode */
  46         int                ust_mode;       /* protection */
  47         int                ust_nlink;      /* number of hard links */
  48         int                ust_uid;        /* user ID of owner */
  49         int                ust_gid;        /* group ID of owner */
  50         unsigned long long ust_size;       /* total size, in bytes */
  51         int                ust_blksize;    /* blocksize for filesystem I/O */
  52         unsigned long long ust_blocks;     /* number of blocks allocated */
  53         unsigned long      ust_atime;      /* time of last access */
  54         unsigned long      ust_mtime;      /* time of last modification */
  55         unsigned long      ust_ctime;      /* time of last change */
  56 };
  57
  58 struct openflags {
  59         unsigned int r : 1;
  60         unsigned int w : 1;
  61         unsigned int s : 1;     /* O_SYNC */
  62         unsigned int c : 1;     /* O_CREAT */
  63         unsigned int t : 1;     /* O_TRUNC */
  64         unsigned int a : 1;     /* O_APPEND */
  65         unsigned int e : 1;     /* O_EXCL */
  66         unsigned int cl : 1;    /* FD_CLOEXEC */
  67 };
  68
  69 #define OPENFLAGS() ((struct openflags) { .r = 0, .w = 0, .s = 0, .c = 0, \
  70                                           .t = 0, .a = 0, .e = 0, .cl = 0 })
  71
  72 static inline struct openflags of_read(struct openflags flags)
  73 {
  74         flags.r = 1;
  75         return flags;
  76 }
  77
  78 static inline struct openflags of_write(struct openflags flags)
  79 {
  80         flags.w = 1;
  81         return flags;
  82 }
  83
  84 static inline struct openflags of_rdwr(struct openflags flags)
  85 {
  86         return of_read(of_write(flags));
  87 }
  88
  89 static inline struct openflags of_set_rw(struct openflags flags, int r, int w)
  90 {
  91         flags.r = r;
  92         flags.w = w;
  93         return flags;
  94 }
  95
  96 static inline struct openflags of_sync(struct openflags flags)
  97 {
  98         flags.s = 1;
  99         return flags;
 100 }
 101
 102 static inline struct openflags of_create(struct openflags flags)
 103 {
 104         flags.c = 1;
 105         return flags;
 106 }
 107
 108 static inline struct openflags of_trunc(struct openflags flags)
 109 {
 110         flags.t = 1;
 111         return flags;
 112 }
 113
 114 static inline struct openflags of_append(struct openflags flags)
 115 {
 116         flags.a = 1;
 117         return flags;
 118 }
 119
 120 static inline struct openflags of_excl(struct openflags flags)
 121 {
 122         flags.e = 1;
 123         return flags;
 124 }
 125
 126 static inline struct openflags of_cloexec(struct openflags flags)
 127 {
 128         flags.cl = 1;
 129         return flags;
 130 }
 131
 132 /* file.c */
 133 extern int os_stat_file(const char *file_name, struct uml_stat *buf);
 134 extern int os_stat_fd(const int fd, struct uml_stat *buf);
 135 extern int os_access(const char *file, int mode);
 136 extern int os_set_exec_close(int fd);
 137 extern int os_ioctl_generic(int fd, unsigned int cmd, unsigned long arg);
 138 extern int os_get_ifname(int fd, char *namebuf);
 139 extern int os_set_slip(int fd);
 140 extern int os_mode_fd(int fd, int mode);
 141 extern int os_fsync_file(int fd);
 142
 143 extern int os_seek_file(int fd, unsigned long long offset);
 144 extern int os_open_file(const char *file, struct openflags flags, int mode);
 145 extern int os_read_file(int fd, void *buf, int len);
 146 extern int os_write_file(int fd, const void *buf, int count);
 147 extern int os_sync_file(int fd);
 148 extern int os_file_size(const char *file, unsigned long long *size_out);
 149 extern int os_pread_file(int fd, void *buf, int len, unsigned long long offset);
 150 extern int os_pwrite_file(int fd, const void *buf, int count, unsigned long long offset);
 151 extern int os_file_modtime(const char *file, unsigned long *modtime);
 152 extern int os_pipe(int *fd, int stream, int close_on_exec);
 153 extern int os_set_fd_async(int fd);
 154 extern int os_clear_fd_async(int fd);
 155 extern int os_set_fd_block(int fd, int blocking);
 156 extern int os_accept_connection(int fd);
 157 extern int os_create_unix_socket(const char *file, int len, int close_on_exec);
 158 extern int os_shutdown_socket(int fd, int r, int w);
 159 extern void os_close_file(int fd);
 160 extern int os_rcv_fd(int fd, int *helper_pid_out);
 161 extern int create_unix_socket(char *file, int len, int close_on_exec);
 162 extern int os_connect_socket(const char *name);
 163 extern int os_file_type(char *file);
 164 extern int os_file_mode(const char *file, struct openflags *mode_out);
 165 extern int os_lock_file(int fd, int excl);
 166 extern void os_flush_stdout(void);
 167 extern int os_stat_filesystem(char *path, long *bsize_out,
 168                               long long *blocks_out, long long *bfree_out,
 169                               long long *bavail_out, long long *files_out,
 170                               long long *ffree_out, void *fsid_out,
 171                               int fsid_size, long *namelen_out,
 172                               long *spare_out);
 173 extern int os_change_dir(char *dir);
 174 extern int os_fchange_dir(int fd);
 175 extern unsigned os_major(unsigned long long dev);
 176 extern unsigned os_minor(unsigned long long dev);
 177 extern unsigned long long os_makedev(unsigned major, unsigned minor);
 178
 179 /* start_up.c */
 180 extern void os_early_checks(void);
 181 extern void os_check_bugs(void);
 182 extern void check_host_supports_tls(int *supports_tls, int *tls_min);
 183
 184 /* mem.c */
 185 extern int create_mem_file(unsigned long long len);
 186
 187 /* process.c */
 188 extern unsigned long os_process_pc(int pid);
 189 extern int os_process_parent(int pid);
 190 extern void os_alarm_process(int pid);
 191 extern void os_stop_process(int pid);
 192 extern void os_kill_process(int pid, int reap_child);
 193 extern void os_kill_ptraced_process(int pid, int reap_child);
 194
 195 extern int os_getpid(void);
 196 extern int os_getpgrp(void);
 197
 198 extern void init_new_thread_signals(void);
 199
 200 extern int os_map_memory(void *virt, int fd, unsigned long long off,
 201                          unsigned long len, int r, int w, int x);
 202 extern int os_protect_memory(void *addr, unsigned long len,
 203                              int r, int w, int x);
 204 extern int os_unmap_memory(void *addr, int len);
 205 extern int os_drop_memory(void *addr, int length);
 206 extern int can_drop_memory(void);
 207 extern void os_flush_stdout(void);
 208 extern int os_mincore(void *addr, unsigned long len);
 209
 210 /* execvp.c */
 211 extern int execvp_noalloc(char *buf, const char *file, char *const argv[]);
 212 /* helper.c */
 213 extern int run_helper(void (*pre_exec)(void *), void *pre_data, char **argv);
 214 extern int run_helper_thread(int (*proc)(void *), void *arg,
 215                              unsigned int flags, unsigned long *stack_out);
 216 extern int helper_wait(int pid);
 217
 218
 219 /* umid.c */
 220 extern int umid_file_name(char *name, char *buf, int len);
 221 extern int set_umid(char *name);
 222 extern char *get_umid(void);
 223
 224 /* signal.c */
 225 extern void timer_set_signal_handler(void);
 226 extern void set_sigstack(void *sig_stack, int size);
 227 extern void remove_sigstack(void);
 228 extern void set_handler(int sig);
 229 extern int change_sig(int signal, int on);
 230 extern void block_signals(void);
 231 extern void unblock_signals(void);
 232 extern int get_signals(void);
 233 extern int set_signals(int enable);
 234 extern int os_is_signal_stack(void);
 235 extern void deliver_alarm(void);
 236
 237 /* util.c */
 238 extern void stack_protections(unsigned long address);
 239 extern int raw(int fd);
 240 extern void setup_machinename(char *machine_out);
 241 extern void setup_hostinfo(char *buf, int len);
 242 extern void os_dump_core(void) __attribute__ ((noreturn));
 243 extern void um_early_printk(const char *s, unsigned int n);
 244 extern void os_fix_helper_signals(void);
 245 extern void os_info(const char *fmt, ...)
 246         __attribute__ ((format (printf, 1, 2)));
 247 extern void os_warn(const char *fmt, ...)
 248         __attribute__ ((format (printf, 1, 2)));
 249
 250 /* time.c */
 251 extern void os_idle_sleep(unsigned long long nsecs);
 252 extern int os_timer_create(void* timer);
 253 extern int os_timer_set_interval(void* timer, void* its);
 254 extern int os_timer_one_shot(int ticks);
 255 extern long long os_timer_disable(void);
 256 extern long os_timer_remain(void* timer);
 257 extern void uml_idle_timer(void);
 258 extern long long os_persistent_clock_emulation(void);
 259 extern long long os_nsecs(void);
 260 extern long long os_vnsecs(void);
 261
 262 /* skas/mem.c */
 263 extern long run_syscall_stub(struct mm_id * mm_idp,
 264                              int syscall, unsigned long *args, long expected,
 265                              void **addr, int done);
 266 extern long syscall_stub_data(struct mm_id * mm_idp,
 267                               unsigned long *data, int data_count,
 268                               void **addr, void **stub_addr);
 269 extern int map(struct mm_id * mm_idp, unsigned long virt,
 270                unsigned long len, int prot, int phys_fd,
 271                unsigned long long offset, int done, void **data);
 272 extern int unmap(struct mm_id * mm_idp, unsigned long addr, unsigned long len,
 273                  int done, void **data);
 274 extern int protect(struct mm_id * mm_idp, unsigned long addr,
 275                    unsigned long len, unsigned int prot, int done, void **data);
 276
 277 /* skas/process.c */
 278 extern int is_skas_winch(int pid, int fd, void *data);
 279 extern int start_userspace(unsigned long stub_stack);
 280 extern int copy_context_skas0(unsigned long stack, int pid);
 281 extern void userspace(struct uml_pt_regs *regs, unsigned long *aux_fp_regs);
 282 extern int map_stub_pages(int fd, unsigned long code, unsigned long data,
 283                           unsigned long stack);
 284 extern void new_thread(void *stack, jmp_buf *buf, void (*handler)(void));
 285 extern void switch_threads(jmp_buf *me, jmp_buf *you);
 286 extern int start_idle_thread(void *stack, jmp_buf *switch_buf);
 287 extern void initial_thread_cb_skas(void (*proc)(void *),
 288                                  void *arg);
 289 extern void halt_skas(void);
 290 extern void reboot_skas(void);
 291
 292 /* irq.c */
 293 extern int os_waiting_for_events_epoll(void);
 294 extern void *os_epoll_get_data_pointer(int index);
 295 extern int os_epoll_triggered(int index, int events);
 296 extern int os_event_mask(int irq_type);
 297 extern int os_setup_epoll(void);
 298 extern int os_add_epoll_fd(int events, int fd, void *data);
 299 extern int os_mod_epoll_fd(int events, int fd, void *data);
 300 extern int os_del_epoll_fd(int fd);
 301 extern void os_set_ioignore(void);
 302 extern void os_close_epoll_fd(void);
 303
 304 /* sigio.c */
 305 extern int add_sigio_fd(int fd);
 306 extern int ignore_sigio_fd(int fd);
 307 extern void maybe_sigio_broken(int fd, int read);
 308 extern void sigio_broken(int fd, int read);
 309
 310 /* prctl.c */
 311 extern int os_arch_prctl(int pid, int option, unsigned long *arg2);
 312
 313 /* tty.c */
 314 extern int get_pty(void);
 315
 316 /* sys-$ARCH/task_size.c */
 317 extern unsigned long os_get_top_address(void);
 318
 319 long syscall(long number, ...);
 320
 321 #endif