arch/um/include/shared/os.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright (C) 2015 Anton Ivanov (aivanov@{brocade.com,kot-begemot.co.uk})
   4  * Copyright (C) 2015 Thomas Meyer (thomas@m3y3r.de)
   5  * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
   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 #define OS_SENDMSG_MAX_FDS 8
  40
  41 /*
  42  * types taken from stat_file() in hostfs_user.c
  43  * (if they are wrong here, they are wrong there...).
  44  */
  45 struct uml_stat {
  46         int                ust_dev;        /* device */
  47         unsigned long long ust_ino;        /* inode */
  48         int                ust_mode;       /* protection */
  49         int                ust_nlink;      /* number of hard links */
  50         int                ust_uid;        /* user ID of owner */
  51         int                ust_gid;        /* group ID of owner */
  52         unsigned long long ust_size;       /* total size, in bytes */
  53         int                ust_blksize;    /* blocksize for filesystem I/O */
  54         unsigned long long ust_blocks;     /* number of blocks allocated */
  55         unsigned long      ust_atime;      /* time of last access */
  56         unsigned long      ust_mtime;      /* time of last modification */
  57         unsigned long      ust_ctime;      /* time of last change */
  58 };
  59
  60 struct openflags {
  61         unsigned int r : 1;
  62         unsigned int w : 1;
  63         unsigned int s : 1;     /* O_SYNC */
  64         unsigned int c : 1;     /* O_CREAT */
  65         unsigned int t : 1;     /* O_TRUNC */
  66         unsigned int a : 1;     /* O_APPEND */
  67         unsigned int e : 1;     /* O_EXCL */
  68         unsigned int cl : 1;    /* FD_CLOEXEC */
  69 };
  70
  71 #define OPENFLAGS() ((struct openflags) { .r = 0, .w = 0, .s = 0, .c = 0, \
  72                                           .t = 0, .a = 0, .e = 0, .cl = 0 })
  73
  74 static inline struct openflags of_read(struct openflags flags)
  75 {
  76         flags.r = 1;
  77         return flags;
  78 }
  79
  80 static inline struct openflags of_write(struct openflags flags)
  81 {
  82         flags.w = 1;
  83         return flags;
  84 }
  85
  86 static inline struct openflags of_rdwr(struct openflags flags)
  87 {
  88         return of_read(of_write(flags));
  89 }
  90
  91 static inline struct openflags of_set_rw(struct openflags flags, int r, int w)
  92 {
  93         flags.r = r;
  94         flags.w = w;
  95         return flags;
  96 }
  97
  98 static inline struct openflags of_sync(struct openflags flags)
  99 {
 100         flags.s = 1;
 101         return flags;
 102 }
 103
 104 static inline struct openflags of_create(struct openflags flags)
 105 {
 106         flags.c = 1;
 107         return flags;
 108 }
 109
 110 static inline struct openflags of_trunc(struct openflags flags)
 111 {
 112         flags.t = 1;
 113         return flags;
 114 }
 115
 116 static inline struct openflags of_append(struct openflags flags)
 117 {
 118         flags.a = 1;
 119         return flags;
 120 }
 121
 122 static inline struct openflags of_excl(struct openflags flags)
 123 {
 124         flags.e = 1;
 125         return flags;
 126 }
 127
 128 static inline struct openflags of_cloexec(struct openflags flags)
 129 {
 130         flags.cl = 1;
 131         return flags;
 132 }
 133
 134 /* file.c */
 135 extern int os_stat_file(const char *file_name, struct uml_stat *buf);
 136 extern int os_stat_fd(const int fd, struct uml_stat *buf);
 137 extern int os_access(const char *file, int mode);
 138 extern int os_set_exec_close(int fd);
 139 extern int os_ioctl_generic(int fd, unsigned int cmd, unsigned long arg);
 140 extern int os_get_ifname(int fd, char *namebuf);
 141 extern int os_set_slip(int fd);
 142 extern int os_mode_fd(int fd, int mode);
 143 extern int os_fsync_file(int fd);
 144
 145 extern int os_seek_file(int fd, unsigned long long offset);
 146 extern int os_open_file(const char *file, struct openflags flags, int mode);
 147 extern int os_read_file(int fd, void *buf, int len);
 148 extern int os_write_file(int fd, const void *buf, int count);
 149 extern int os_sync_file(int fd);
 150 extern int os_file_size(const char *file, unsigned long long *size_out);
 151 extern int os_pread_file(int fd, void *buf, int len, unsigned long long offset);
 152 extern int os_pwrite_file(int fd, const void *buf, int count, unsigned long long offset);
 153 extern int os_file_modtime(const char *file, long long *modtime);
 154 extern int os_pipe(int *fd, int stream, int close_on_exec);
 155 extern int os_set_fd_async(int fd);
 156 extern int os_clear_fd_async(int fd);
 157 extern int os_set_fd_block(int fd, int blocking);
 158 extern int os_accept_connection(int fd);
 159 extern int os_create_unix_socket(const char *file, int len, int close_on_exec);
 160 extern int os_shutdown_socket(int fd, int r, int w);
 161 extern void os_close_file(int fd);
 162 extern int os_rcv_fd(int fd, int *helper_pid_out);
 163 extern int create_unix_socket(char *file, int len, int close_on_exec);
 164 extern int os_connect_socket(const char *name);
 165 extern int os_file_type(char *file);
 166 extern int os_file_mode(const char *file, struct openflags *mode_out);
 167 extern int os_lock_file(int fd, int excl);
 168 extern void os_flush_stdout(void);
 169 extern int os_stat_filesystem(char *path, long *bsize_out,
 170                               long long *blocks_out, long long *bfree_out,
 171                               long long *bavail_out, long long *files_out,
 172                               long long *ffree_out, void *fsid_out,
 173                               int fsid_size, long *namelen_out,
 174                               long *spare_out);
 175 extern int os_change_dir(char *dir);
 176 extern int os_fchange_dir(int fd);
 177 extern unsigned os_major(unsigned long long dev);
 178 extern unsigned os_minor(unsigned long long dev);
 179 extern unsigned long long os_makedev(unsigned major, unsigned minor);
 180 extern int os_falloc_punch(int fd, unsigned long long offset, int count);
 181 extern int os_eventfd(unsigned int initval, int flags);
 182 extern int os_sendmsg_fds(int fd, const void *buf, unsigned int len,
 183                           const int *fds, unsigned int fds_num);
 184
 185 /* start_up.c */
 186 extern void os_early_checks(void);
 187 extern void os_check_bugs(void);
 188 extern void check_host_supports_tls(int *supports_tls, int *tls_min);
 189
 190 /* mem.c */
 191 extern int create_mem_file(unsigned long long len);
 192
 193 /* process.c */
 194 extern unsigned long os_process_pc(int pid);
 195 extern int os_process_parent(int pid);
 196 extern void os_alarm_process(int pid);
 197 extern void os_stop_process(int pid);
 198 extern void os_kill_process(int pid, int reap_child);
 199 extern void os_kill_ptraced_process(int pid, int reap_child);
 200
 201 extern int os_getpid(void);
 202 extern int os_getpgrp(void);
 203
 204 extern void init_new_thread_signals(void);
 205
 206 extern int os_map_memory(void *virt, int fd, unsigned long long off,
 207                          unsigned long len, int r, int w, int x);
 208 extern int os_protect_memory(void *addr, unsigned long len,
 209                              int r, int w, int x);
 210 extern int os_unmap_memory(void *addr, int len);
 211 extern int os_drop_memory(void *addr, int length);
 212 extern int can_drop_memory(void);
 213 extern void os_flush_stdout(void);
 214 extern int os_mincore(void *addr, unsigned long len);
 215
 216 /* execvp.c */
 217 extern int execvp_noalloc(char *buf, const char *file, char *const argv[]);
 218 /* helper.c */
 219 extern int run_helper(void (*pre_exec)(void *), void *pre_data, char **argv);
 220 extern int run_helper_thread(int (*proc)(void *), void *arg,
 221                              unsigned int flags, unsigned long *stack_out);
 222 extern int helper_wait(int pid);
 223
 224
 225 /* umid.c */
 226 extern int umid_file_name(char *name, char *buf, int len);
 227 extern int set_umid(char *name);
 228 extern char *get_umid(void);
 229
 230 /* signal.c */
 231 extern void timer_set_signal_handler(void);
 232 extern void set_sigstack(void *sig_stack, int size);
 233 extern void remove_sigstack(void);
 234 extern void set_handler(int sig);
 235 extern int change_sig(int signal, int on);
 236 extern void block_signals(void);
 237 extern void unblock_signals(void);
 238 extern int get_signals(void);
 239 extern int set_signals(int enable);
 240 extern int set_signals_trace(int enable);
 241 extern int os_is_signal_stack(void);
 242 extern void deliver_alarm(void);
 243
 244 /* util.c */
 245 extern void stack_protections(unsigned long address);
 246 extern int raw(int fd);
 247 extern void setup_machinename(char *machine_out);
 248 extern void setup_hostinfo(char *buf, int len);
 249 extern void os_dump_core(void) __attribute__ ((noreturn));
 250 extern void um_early_printk(const char *s, unsigned int n);
 251 extern void os_fix_helper_signals(void);
 252 extern void os_info(const char *fmt, ...)
 253         __attribute__ ((format (printf, 1, 2)));
 254 extern void os_warn(const char *fmt, ...)
 255         __attribute__ ((format (printf, 1, 2)));
 256
 257 /* time.c */
 258 extern void os_idle_sleep(unsigned long long nsecs);
 259 extern int os_timer_create(void);
 260 extern int os_timer_set_interval(unsigned long long nsecs);
 261 extern int os_timer_one_shot(unsigned long long nsecs);
 262 extern void os_timer_disable(void);
 263 extern void uml_idle_timer(void);
 264 extern long long os_persistent_clock_emulation(void);
 265 extern long long os_nsecs(void);
 266
 267 /* skas/mem.c */
 268 extern long run_syscall_stub(struct mm_id * mm_idp,
 269                              int syscall, unsigned long *args, long expected,
 270                              void **addr, int done);
 271 extern long syscall_stub_data(struct mm_id * mm_idp,
 272                               unsigned long *data, int data_count,
 273                               void **addr, void **stub_addr);
 274 extern int map(struct mm_id * mm_idp, unsigned long virt,
 275                unsigned long len, int prot, int phys_fd,
 276                unsigned long long offset, int done, void **data);
 277 extern int unmap(struct mm_id * mm_idp, unsigned long addr, unsigned long len,
 278                  int done, void **data);
 279 extern int protect(struct mm_id * mm_idp, unsigned long addr,
 280                    unsigned long len, unsigned int prot, int done, void **data);
 281
 282 /* skas/process.c */
 283 extern int is_skas_winch(int pid, int fd, void *data);
 284 extern int start_userspace(unsigned long stub_stack);
 285 extern int copy_context_skas0(unsigned long stack, int pid);
 286 extern void userspace(struct uml_pt_regs *regs, unsigned long *aux_fp_regs);
 287 extern int map_stub_pages(int fd, unsigned long code, unsigned long data,
 288                           unsigned long stack);
 289 extern void new_thread(void *stack, jmp_buf *buf, void (*handler)(void));
 290 extern void switch_threads(jmp_buf *me, jmp_buf *you);
 291 extern int start_idle_thread(void *stack, jmp_buf *switch_buf);
 292 extern void initial_thread_cb_skas(void (*proc)(void *),
 293                                  void *arg);
 294 extern void halt_skas(void);
 295 extern void reboot_skas(void);
 296
 297 /* irq.c */
 298 extern int os_waiting_for_events_epoll(void);
 299 extern void *os_epoll_get_data_pointer(int index);
 300 extern int os_epoll_triggered(int index, int events);
 301 extern int os_event_mask(int irq_type);
 302 extern int os_setup_epoll(void);
 303 extern int os_add_epoll_fd(int events, int fd, void *data);
 304 extern int os_mod_epoll_fd(int events, int fd, void *data);
 305 extern int os_del_epoll_fd(int fd);
 306 extern void os_set_ioignore(void);
 307 extern void os_close_epoll_fd(void);
 308
 309 /* sigio.c */
 310 extern int add_sigio_fd(int fd);
 311 extern int ignore_sigio_fd(int fd);
 312 extern void maybe_sigio_broken(int fd, int read);
 313 extern void sigio_broken(int fd, int read);
 314
 315 /* prctl.c */
 316 extern int os_arch_prctl(int pid, int option, unsigned long *arg2);
 317
 318 /* tty.c */
 319 extern int get_pty(void);
 320
 321 /* sys-$ARCH/task_size.c */
 322 extern unsigned long os_get_top_address(void);
 323
 324 long syscall(long number, ...);
 325
 326 /* irqflags tracing */
 327 extern void block_signals_trace(void);
 328 extern void unblock_signals_trace(void);
 329 extern void um_trace_signals_on(void);
 330 extern void um_trace_signals_off(void);
 331
 332 #endif