musl/src/internal/syscall.h

#ifndef _SYSCALL_H
#define _SYSCALL_H

#define SYSCALL_LL(x) \
((union { long long ll; long l[2]; }){ .ll = x }).l[0], \
((union { long long ll; long l[2]; }){ .ll = x }).l[1]

#define SYSCALL_SIGSET_SIZE 8

#if defined(SYSCALL_STANDALONE)
#include <errno.h>
static inline long __syscall_ret(unsigned long r)
{
	if (r >= (unsigned long)-1 - 4096) {
		errno = -(long)r;
		return -1;
	}
	return (long)r;
}
#elif defined(SYSCALL_NORETURN)
static inline long __syscall_ret(unsigned long r)
{
	for(;;);
	return 0;
}
#elif defined(SYSCALL_RETURN_ERRNO)
static inline long __syscall_ret(unsigned long r)
{
	return -r;
}
#else
extern long __syscall_ret(unsigned long);
#endif

#define SYSCALL0 "int $128"

#ifdef __PIC__
#define SYSCALL "xchgl %%ebx,%2\n\t" SYSCALL0 "\n\txchgl %%ebx,%2"
#define EBX "m"
#else
#define SYSCALL SYSCALL0
#define EBX "b"
#endif

static inline long syscall0(long n)
{
	unsigned long ret;
	__asm__ __volatile__ (SYSCALL0 : "=a"(ret) : "a"(n) : "memory");
	return __syscall_ret(ret);
}

static inline long syscall1(long n, long a1)
{
	unsigned long ret;
	__asm__ __volatile__ (SYSCALL : "=a"(ret) : "a"(n), EBX(a1) : "memory");
	return __syscall_ret(ret);
}

static inline long syscall2(long n, long a1, long a2)
{
	unsigned long ret;
	__asm__ __volatile__ (SYSCALL : "=a"(ret) : "a"(n), EBX(a1), "c"(a2) : "memory");
	return __syscall_ret(ret);
}

static inline long syscall3(long n, long a1, long a2, long a3)
{
	unsigned long ret;
	__asm__ __volatile__ (SYSCALL : "=a"(ret) : "a"(n), EBX(a1), "c"(a2), "d"(a3) : "memory");
	return __syscall_ret(ret);
}

static inline long syscall4(long n, long a1, long a2, long a3, long a4)
{
	unsigned long ret;
	__asm__ __volatile__ (SYSCALL : "=a"(ret) : "a"(n), EBX(a1), "c"(a2), "d"(a3), "S"(a4) : "memory");
	return __syscall_ret(ret);
}

static inline long syscall5(long n, long a1, long a2, long a3, long a4, long a5)
{
	unsigned long ret;
	__asm__ __volatile__ (SYSCALL : "=a"(ret) : "a"(n), EBX(a1), "c"(a2), "d"(a3), "S"(a4), "D"(a5) : "memory");
	return __syscall_ret(ret);
}

#ifdef __PIC__
/* note: it's probably only safe to use this when a6 is on the stack */
static inline long syscall6(long n, long a1, long a2, long a3, long a4, long a5, long a6)
{
	unsigned long ret;
	__asm__ __volatile__ ("xchgl %%ebx,%2 ; pushl %1 ; pushl %%ebp ; movl %%eax,%%ebp ; movl 4(%%esp),%%eax ; int $128 ; popl %%ebp ; popl %%ecx ; xchgl %%ebx,%2"
		: "=a"(ret) : "g"(n), EBX(a1), "c"(a2), "d"(a3), "S"(a4), "D"(a5), "a"(a6) : "memory");
	return __syscall_ret(ret);
}
#else
static inline long syscall6(long n, long a1, long a2, long a3, long a4, long a5, long a6)
{
	unsigned long ret;
	__asm__ __volatile__ ("pushl %%ebp ; mov %1, %%ebp ; xchg %%ebp, %7 ; int $128 ; popl %%ebp"
		: "=a"(ret) : "g"(n), EBX(a1), "c"(a2), "d"(a3), "S"(a4), "D"(a5), "a"(a6) : "memory");
	return __syscall_ret(ret);
}
#endif

#define __NR_restart_syscall      0
#define __NR_exit		  1
#define __NR_fork		  2
#define __NR_read		  3
#define __NR_write		  4
#define __NR_open		  5
#define __NR_close		  6
#define __NR_waitpid		  7
#define __NR_creat		  8
#define __NR_link		  9
#define __NR_unlink		 10
#define __NR_execve		 11
#define __NR_chdir		 12
#define __NR_time		 13
#define __NR_mknod		 14
#define __NR_chmod		 15
#define __NR_lchown		 16
#define __NR_break		 17
#define __NR_oldstat		 18
#define __NR_lseek		 19
#define __NR_getpid		 20
#define __NR_mount		 21
#define __NR_umount		 22
#define __NR_setuid		 23
#define __NR_getuid		 24
#define __NR_stime		 25
#define __NR_ptrace		 26
#define __NR_alarm		 27
#define __NR_oldfstat		 28
#define __NR_pause		 29
#define __NR_utime		 30
#define __NR_stty		 31
#define __NR_gtty		 32
#define __NR_access		 33
#define __NR_nice		 34
#define __NR_ftime		 35
#define __NR_sync		 36
#define __NR_kill		 37
#define __NR_rename		 38
#define __NR_mkdir		 39
#define __NR_rmdir		 40
#define __NR_dup		 41
#define __NR_pipe		 42
#define __NR_times		 43
#define __NR_prof		 44
#define __NR_brk		 45
#define __NR_setgid		 46
#define __NR_getgid		 47
#define __NR_signal		 48
#define __NR_geteuid		 49
#define __NR_getegid		 50
#define __NR_acct		 51
#define __NR_umount2		 52
#define __NR_lock		 53
#define __NR_ioctl		 54
#define __NR_fcntl		 55
#define __NR_mpx		 56
#define __NR_setpgid		 57
#define __NR_ulimit		 58
#define __NR_oldolduname	 59
#define __NR_umask		 60
#define __NR_chroot		 61
#define __NR_ustat		 62
#define __NR_dup2		 63
#define __NR_getppid		 64
#define __NR_getpgrp		 65
#define __NR_setsid		 66
#define __NR_sigaction		 67
#define __NR_sgetmask		 68
#define __NR_ssetmask		 69
#define __NR_setreuid		 70
#define __NR_setregid		 71
#define __NR_sigsuspend		 72
#define __NR_sigpending		 73
#define __NR_sethostname	 74
#define __NR_setrlimit		 75
#define __NR_getrlimit		 76   /* Back compatible 2Gig limited rlimit */
#define __NR_getrusage		 77
#define __NR_gettimeofday	 78
#define __NR_settimeofday	 79
#define __NR_getgroups		 80
#define __NR_setgroups		 81
#define __NR_select		 82
#define __NR_symlink		 83
#define __NR_oldlstat		 84
#define __NR_readlink		 85
#define __NR_uselib		 86
#define __NR_swapon		 87
#define __NR_reboot		 88
#define __NR_readdir		 89
#define __NR_mmap		 90
#define __NR_munmap		 91
#define __NR_truncate		 92
#define __NR_ftruncate		 93
#define __NR_fchmod		 94
#define __NR_fchown		 95
#define __NR_getpriority	 96
#define __NR_setpriority	 97
#define __NR_profil		 98
#define __NR_statfs		99
#define __NR_fstatfs		100
#define __NR_ioperm		101
#define __NR_socketcall		102
#define __NR_syslog		103
#define __NR_setitimer		104
#define __NR_getitimer		105
#define __NR_stat		106
#define __NR_lstat		107
#define __NR_fstat		108
#define __NR_olduname		109
#define __NR_iopl		110
#define __NR_vhangup		111
#define __NR_idle		112
#define __NR_vm86old		113
#define __NR_wait4		114
#define __NR_swapoff		115
#define __NR_sysinfo		116
#define __NR_ipc		117
#define __NR_fsync		118
#define __NR_sigreturn		119
#define __NR_clone		120
#define __NR_setdomainname	121
#define __NR_uname		122
#define __NR_modify_ldt		123
#define __NR_adjtimex		124
#define __NR_mprotect		125
#define __NR_sigprocmask	126
#define __NR_create_module	127
#define __NR_init_module	128
#define __NR_delete_module	129
#define __NR_get_kernel_syms	130
#define __NR_quotactl		131
#define __NR_getpgid		132
#define __NR_fchdir		133
#define __NR_bdflush		134
#define __NR_sysfs		135
#define __NR_personality	136
#define __NR_afs_syscall	137
#define __NR_setfsuid		138
#define __NR_setfsgid		139
#define __NR__llseek		140
#define __NR_getdents		141
#define __NR__newselect		142
#define __NR_flock		143
#define __NR_msync		144
#define __NR_readv		145
#define __NR_writev		146
#define __NR_getsid		147
#define __NR_fdatasync		148
#define __NR__sysctl		149
#define __NR_mlock		150
#define __NR_munlock		151
#define __NR_mlockall		152
#define __NR_munlockall		153
#define __NR_sched_setparam		154
#define __NR_sched_getparam		155
#define __NR_sched_setscheduler		156
#define __NR_sched_getscheduler		157
#define __NR_sched_yield		158
#define __NR_sched_get_priority_max	159
#define __NR_sched_get_priority_min	160
#define __NR_sched_rr_get_interval	161
#define __NR_nanosleep		162
#define __NR_mremap		163
#define __NR_setresuid		164
#define __NR_getresuid		165
#define __NR_vm86		166
#define __NR_query_module	167
#define __NR_poll		168
#define __NR_nfsservctl		169
#define __NR_setresgid		170
#define __NR_getresgid		171
#define __NR_prctl              172
#define __NR_rt_sigreturn	173
#define __NR_rt_sigaction	174
#define __NR_rt_sigprocmask	175
#define __NR_rt_sigpending	176
#define __NR_rt_sigtimedwait	177
#define __NR_rt_sigqueueinfo	178
#define __NR_rt_sigsuspend	179
#define __NR_pread64		180
#define __NR_pwrite64		181
#define __NR_chown		182
#define __NR_getcwd		183
#define __NR_capget		184
#define __NR_capset		185
#define __NR_sigaltstack	186
#define __NR_sendfile		187
#define __NR_getpmsg		188
#define __NR_putpmsg		189
#define __NR_vfork		190
#define __NR_ugetrlimit		191
#define __NR_mmap2		192
#define __NR_truncate64		193
#define __NR_ftruncate64	194
#define __NR_stat64		195
#define __NR_lstat64		196
#define __NR_fstat64		197
#define __NR_lchown32		198
#define __NR_getuid32		199
#define __NR_getgid32		200
#define __NR_geteuid32		201
#define __NR_getegid32		202
#define __NR_setreuid32		203
#define __NR_setregid32		204
#define __NR_getgroups32	205
#define __NR_setgroups32	206
#define __NR_fchown32		207
#define __NR_setresuid32	208
#define __NR_getresuid32	209
#define __NR_setresgid32	210
#define __NR_getresgid32	211
#define __NR_chown32		212
#define __NR_setuid32		213
#define __NR_setgid32		214
#define __NR_setfsuid32		215
#define __NR_setfsgid32		216
#define __NR_pivot_root		217
#define __NR_mincore		218
#define __NR_madvise		219
#define __NR_madvise1		219
#define __NR_getdents64		220
#define __NR_fcntl64		221
/* 223 is unused */
#define __NR_gettid		224
#define __NR_readahead		225
#define __NR_setxattr		226
#define __NR_lsetxattr		227
#define __NR_fsetxattr		228
#define __NR_getxattr		229
#define __NR_lgetxattr		230
#define __NR_fgetxattr		231
#define __NR_listxattr		232
#define __NR_llistxattr		233
#define __NR_flistxattr		234
#define __NR_removexattr	235
#define __NR_lremovexattr	236
#define __NR_fremovexattr	237
#define __NR_tkill		238
#define __NR_sendfile64		239
#define __NR_futex		240
#define __NR_sched_setaffinity	241
#define __NR_sched_getaffinity	242
#define __NR_set_thread_area	243
#define __NR_get_thread_area	244
#define __NR_io_setup		245
#define __NR_io_destroy		246
#define __NR_io_getevents	247
#define __NR_io_submit		248
#define __NR_io_cancel		249
#define __NR_fadvise64		250
/* 251 is available for reuse (was briefly sys_set_zone_reclaim) */
#define __NR_exit_group		252
#define __NR_lookup_dcookie	253
#define __NR_epoll_create	254
#define __NR_epoll_ctl		255
#define __NR_epoll_wait		256
#define __NR_remap_file_pages	257
#define __NR_set_tid_address	258
#define __NR_timer_create	259
#define __NR_timer_settime	(__NR_timer_create+1)
#define __NR_timer_gettime	(__NR_timer_create+2)
#define __NR_timer_getoverrun	(__NR_timer_create+3)
#define __NR_timer_delete	(__NR_timer_create+4)
#define __NR_clock_settime	(__NR_timer_create+5)
#define __NR_clock_gettime	(__NR_timer_create+6)
#define __NR_clock_getres	(__NR_timer_create+7)
#define __NR_clock_nanosleep	(__NR_timer_create+8)
#define __NR_statfs64		268
#define __NR_fstatfs64		269
#define __NR_tgkill		270
#define __NR_utimes		271
#define __NR_fadvise64_64	272
#define __NR_vserver		273
#define __NR_mbind		274
#define __NR_get_mempolicy	275
#define __NR_set_mempolicy	276
#define __NR_mq_open 		277
#define __NR_mq_unlink		(__NR_mq_open+1)
#define __NR_mq_timedsend	(__NR_mq_open+2)
#define __NR_mq_timedreceive	(__NR_mq_open+3)
#define __NR_mq_notify		(__NR_mq_open+4)
#define __NR_mq_getsetattr	(__NR_mq_open+5)
#define __NR_kexec_load		283
#define __NR_waitid		284
/* #define __NR_sys_setaltroot	285 */
#define __NR_add_key		286
#define __NR_request_key	287
#define __NR_keyctl		288
#define __NR_ioprio_set		289
#define __NR_ioprio_get		290
#define __NR_inotify_init	291
#define __NR_inotify_add_watch	292
#define __NR_inotify_rm_watch	293
#define __NR_migrate_pages	294
#define __NR_openat		295
#define __NR_mkdirat		296
#define __NR_mknodat		297
#define __NR_fchownat		298
#define __NR_futimesat		299
#define __NR_fstatat64		300
#define __NR_unlinkat		301
#define __NR_renameat		302
#define __NR_linkat		303
#define __NR_symlinkat		304
#define __NR_readlinkat		305
#define __NR_fchmodat		306
#define __NR_faccessat		307
#define __NR_pselect6		308
#define __NR_ppoll		309
#define __NR_unshare		310
#define __NR_set_robust_list	311
#define __NR_get_robust_list	312
#define __NR_splice		313
#define __NR_sync_file_range	314
#define __NR_tee		315
#define __NR_vmsplice		316
#define __NR_move_pages		317
#define __NR_getcpu		318
#define __NR_epoll_pwait	319
#define __NR_utimensat		320
#define __NR_signalfd		321
#define __NR_timerfd_create	322
#define __NR_eventfd		323
#define __NR_fallocate		324
#define __NR_timerfd_settime	325
#define __NR_timerfd_gettime	326
#define __NR_signalfd4		327
#define __NR_eventfd2		328
#define __NR_epoll_create1	329
#define __NR_dup3		330
#define __NR_pipe2		331
#define __NR_inotify_init1	332
#define __NR_preadv		333
#define __NR_pwritev		334


#undef O_LARGEFILE
#define O_LARGEFILE 0100000

/* the following are needed for iso c functions to use */
#define __syscall_open(filename, flags, mode) syscall3(__NR_open, (long)(filename), (flags)|O_LARGEFILE, (mode))
#define __syscall_read(fd, buf, len)          syscall3(__NR_read, (fd), (long)(buf), (len))
#define __syscall_write(fd, buf, len)         syscall3(__NR_write, (fd), (long)(buf), (len))
#define __syscall_close(fd)                   syscall1(__NR_close, (fd))
#define __syscall_fcntl(fd, cmd, arg)         syscall3(__NR_fcntl64, (fd), (cmd), (long)(arg))
#define __syscall_dup2(old, new)              syscall2(__NR_dup2, (old), (new))
#define __syscall_unlink(path)                syscall1(__NR_unlink, (long)(path))
#define __syscall_getpid()                    syscall0(__NR_getpid)
#define __syscall_kill(pid,sig)               syscall2(__NR_kill, (pid), (sig))
#define __syscall_sigaction(sig,new,old)      syscall4(__NR_rt_sigaction, (sig), (long)(new), (long)(old), SYSCALL_SIGSET_SIZE)
#define __syscall_ioctl(fd,ioc,arg)           syscall3(__NR_ioctl, (fd), (ioc), (long)(arg))
#define __syscall_exit(code)                  syscall1(__NR_exit, code)

#define __NEED_off_t
#include <bits/alltypes.h>

static inline off_t __syscall_lseek(int fd, off_t offset, int whence)
{
	off_t result;
	return syscall5(__NR__llseek, fd, offset>>32, offset, (long)&result, whence) ? -1 : result;
}

#endif