1struct syscall_result {
2 long val;
3 int errno;
4};
5
6static struct syscall_result syscall_return(long result)
7{
8 struct syscall_result res;
9 if (((unsigned long)result) >= ((unsigned long)-125)) {
10 res.errno = - result;
11 res.val = -1;
12 } else {
13 res.errno = 0;
14 res.val = result;
15 }
16 return res;
17}
18
19static struct syscall_result syscall0(unsigned long nr)
20{
21 long res;
22 asm volatile(
23 "int $0x80"
24 : "=a" (res)
25 : "a" (nr));
26 return syscall_return(res);
27}
28
29static struct syscall_result syscall1(unsigned long nr, unsigned long arg1)
30{
31 long res;
32 asm volatile(
33 "int $0x80"
34 : "=a" (res)
35 : "a" (nr), "b" (arg1));
36 return syscall_return(res);
37
38}
39
40static struct syscall_result syscall2(unsigned long nr, unsigned long arg1, unsigned long arg2)
41{
42 long res;
43 asm volatile(
44 "int $0x80"
45 : "=a" (res)
46 : "a" (nr), "b" (arg1), "c" (arg2));
47 return syscall_return(res);
48
49}
50
51
52static struct syscall_result syscall3(unsigned long nr, unsigned long arg1, unsigned long arg2,
53 unsigned long arg3)
54{
55 long res;
56 asm volatile(
57 "int $0x80"
58 : "=a" (res)
59 : "a" (nr), "b" (arg1), "c" (arg2), "d" (arg3));
60 return syscall_return(res);
61
62}
63
64static struct syscall_result syscall4(unsigned long nr, unsigned long arg1, unsigned long arg2,
65 unsigned long arg3, unsigned long arg4)
66{
67 long res;
68 asm volatile(
69 "int $0x80"
70 : "=a" (res)
71 : "a" (nr), "b" (arg1), "c" (arg2), "d" (arg3), "S" (arg4));
72 return syscall_return(res);
73
74}
75
76static struct syscall_result syscall5(unsigned long nr, unsigned long arg1, unsigned long arg2,
77 unsigned long arg3, unsigned long arg4, unsigned long arg5)
78{
79 long res;
80 asm volatile(
81 "int $0x80"
82 : "=a" (res)
83 : "a" (nr), "b" (arg1), "c" (arg2), "d" (arg3),
84 "S" (arg4), "D" (arg5));
85 return syscall_return(res);
86
87}
88
89#define NR_exit 1
90#define NR_fork 2
91#define NR_read 3
92#define NR_write 4
93#define NR_open 5
94#define NR_close 6
95#define NR_waitpid 7
96#define NR_creat 8
97#define NR_link 9
98#define NR_unlink 10
99#define NR_execve 11
100#define NR_chdir 12
101#define NR_time 13
102#define NR_mknod 14
103#define NR_chmod 15
104#define NR_lchown 16
105#define NR_break 17
106#define NR_oldstat 18
107#define NR_lseek 19
108#define NR_getpid 20
109#define NR_mount 21
110#define NR_umount 22
111#define NR_setuid 23
112#define NR_getuid 24
113#define NR_stime 25
114#define NR_ptrace 26
115#define NR_alarm 27
116#define NR_oldfstat 28
117#define NR_pause 29
118#define NR_utime 30
119#define NR_stty 31
120#define NR_gtty 32
121#define NR_access 33
122#define NR_nice 34
123#define NR_ftime 35
124#define NR_sync 36
125#define NR_kill 37
126#define NR_rename 38
127#define NR_mkdir 39
128#define NR_rmdir 40
129#define NR_dup 41
130#define NR_pipe 42
131#define NR_times 43
132#define NR_prof 44
133#define NR_brk 45
134#define NR_setgid 46
135#define NR_getgid 47
136#define NR_signal 48
137#define NR_geteuid 49
138#define NR_getegid 50
139#define NR_acct 51
140#define NR_umount2 52
141#define NR_lock 53
142#define NR_ioctl 54
143#define NR_fcntl 55
144#define NR_mpx 56
145#define NR_setpgid 57
146#define NR_ulimit 58
147#define NR_oldolduname 59
148#define NR_umask 60
149#define NR_chroot 61
150#define NR_ustat 62
151#define NR_dup2 63
152#define NR_getppid 64
153#define NR_getpgrp 65
154#define NR_setsid 66
155#define NR_sigaction 67
156#define NR_sgetmask 68
157#define NR_ssetmask 69
158#define NR_setreuid 70
159#define NR_setregid 71
160#define NR_sigsuspend 72
161#define NR_sigpending 73
162#define NR_sethostname 74
163#define NR_setrlimit 75
164#define NR_getrlimit 76
165#define NR_getrusage 77
166#define NR_gettimeofday 78
167#define NR_settimeofday 79
168#define NR_getgroups 80
169#define NR_setgroups 81
170#define NR_select 82
171#define NR_symlink 83
172#define NR_oldlstat 84
173#define NR_readlink 85
174#define NR_uselib 86
175#define NR_swapon 87
176#define NR_reboot 88
177#define NR_readdir 89
178#define NR_mmap 90
179#define NR_munmap 91
180#define NR_truncate 92
181#define NR_ftruncate 93
182#define NR_fchmod 94
183#define NR_fchown 95
184#define NR_getpriority 96
185#define NR_setpriority 97
186#define NR_profil 98
187#define NR_statfs 99
188#define NR_fstatfs 100
189#define NR_ioperm 101
190#define NR_socketcall 102
191#define NR_syslog 103
192#define NR_setitimer 104
193#define NR_getitimer 105
194#define NR_stat 106
195#define NR_lstat 107
196#define NR_fstat 108
197#define NR_olduname 109
198#define NR_iopl 110
199#define NR_vhangup 111
200#define NR_idle 112
201#define NR_vm86old 113
202#define NR_wait4 114
203#define NR_swapoff 115
204#define NR_sysinfo 116
205#define NR_ipc 117
206#define NR_fsync 118
207#define NR_sigreturn 119
208#define NR_clone 120
209#define NR_setdomainname 121
210#define NR_uname 122
211#define NR_modify_ldt 123
212#define NR_adjtimex 124
213#define NR_mprotect 125
214#define NR_sigprocmask 126
215#define NR_create_module 127
216#define NR_init_module 128
217#define NR_delete_module 129
218#define NR_get_kernel_syms 130
219#define NR_quotactl 131
220#define NR_getpgid 132
221#define NR_fchdir 133
222#define NR_bdflush 134
223#define NR_sysfs 135
224#define NR_personality 136
225#define NR_afs_syscall 137
226#define NR_setfsuid 138
227#define NR_setfsgid 139
228#define NR__llseek 140
229#define NR_getdents 141
230#define NR__newselect 142
231#define NR_flock 143
232#define NR_msync 144
233#define NR_readv 145
234#define NR_writev 146
235#define NR_getsid 147
236#define NR_fdatasync 148
237#define NR__sysctl 149
238#define NR_mlock 150
239#define NR_munlock 151
240#define NR_mlockall 152
241#define NR_munlockall 153
242#define NR_sched_setparam 154
243#define NR_sched_getparam 155
244#define NR_sched_setscheduler 156
245#define NR_sched_getscheduler 157
246#define NR_sched_yield 158
247#define NR_sched_get_priority_max 159
248#define NR_sched_get_priority_min 160
249#define NR_sched_rr_get_interval 161
250#define NR_nanosleep 162
251#define NR_mremap 163
252#define NR_setresuid 164
253#define NR_getresuid 165
254#define NR_vm86 166
255#define NR_query_module 167
256#define NR_poll 168
257#define NR_nfsservctl 169
258#define NR_setresgid 170
259#define NR_getresgid 171
260#define NR_prctl 172
261#define NR_rt_sigreturn 173
262#define NR_rt_sigaction 174
263#define NR_rt_sigprocmask 175
264#define NR_rt_sigpending 176
265#define NR_rt_sigtimedwait 177
266#define NR_rt_sigqueueinfo 178
267#define NR_rt_sigsuspend 179
268#define NR_pread 180
269#define NR_pwrite 181
270#define NR_chown 182
271#define NR_getcwd 183
272#define NR_capget 184
273#define NR_capset 185
274#define NR_sigaltstack 186
275#define NR_sendfile 187
276#define NR_getpmsg 188
277#define NR_putpmsg 189
278#define NR_vfork 190
279
280typedef long ssize_t;
281typedef unsigned long size_t;
282
283
284#define STDIN_FILENO 0
285#define STDOUT_FILENO 1
286#define STDERR_FILENO 2
287
288static ssize_t write(int fd, const void *buf, size_t count)
289{
290 struct syscall_result res;
291 res = syscall3(NR_write, fd, (unsigned long)buf, count);
292 return res.val;
293}
294
295static void _exit(int status)
296{
297 struct syscall_result res;
298 res = syscall1(NR_exit, status);
299}
300
301static void main(void)
302{
303 static const char msg[] = "hello world\r\n";
304 write(STDOUT_FILENO, msg, sizeof(msg));
305 _exit(0);
306}
307
