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#define __NR_SYSCALL_BASE        0x900000
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#define __NR_exit1                        (__NR_SYSCALL_BASE+  1)
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#define __NR_write                        (__NR_SYSCALL_BASE+  4)
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#define __sys2(x) #x
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#define __sys1(x) __sys2(x)
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#ifndef __syscall
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#define __syscall(name) "swi\t" __sys1(__NR_##name) "\n\t"
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#endif
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#define __syscall_return(type, res)                                        \
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do {                                                                        \
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        return (type) (res);                                                \
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} while (0)
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#define _syscall0(type,name)                                                \
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type name(void) {                                                        \
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  long __res;                                                                \
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  __asm__ __volatile__ (                                                \
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  __syscall(name)                                                        \
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  "mov %0,r0"                                                                \
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  :"=r" (__res) : : "r0","lr");                                                \
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  __syscall_return(type,__res);                                                \
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}
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#define _syscall1(type,name,type1,arg1)                                        \
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type name(type1 arg1) {                                                        \
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  long __res;                                                                \
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  __asm__ __volatile__ (                                                \
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  "mov\tr0,%1\n\t"                                                        \
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  __syscall(name)                                                        \
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  "mov %0,r0"                                                                \
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        : "=r" (__res)                                                        \
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        : "r" ((long)(arg1))                                                \
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        : "r0","lr");                                                        \
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  __syscall_return(type,__res);                                                \
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}
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#define _syscall2(type,name,type1,arg1,type2,arg2)                        \
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type name(type1 arg1,type2 arg2) {                                        \
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  long __res;                                                                \
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  __asm__ __volatile__ (                                                \
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  "mov\tr0,%1\n\t"                                                        \
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  "mov\tr1,%2\n\t"                                                        \
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  __syscall(name)                                                        \
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  "mov\t%0,r0"                                                                \
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        : "=r" (__res)                                                        \
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        : "r" ((long)(arg1)),"r" ((long)(arg2))                                \
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        : "r0","r1","lr");                                                \
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  __syscall_return(type,__res);                                                \
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}
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#define _syscall3(type,name,type1,arg1,type2,arg2,type3,arg3)                \
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type name(type1 arg1,type2 arg2,type3 arg3) {                                \
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  long __res;                                                                \
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  __asm__ __volatile__ (                                                \
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  "mov\tr0,%1\n\t"                                                        \
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  "mov\tr1,%2\n\t"                                                        \
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  "mov\tr2,%3\n\t"                                                        \
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  __syscall(name)                                                        \
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  "mov\t%0,r0"                                                                \
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        : "=r" (__res)                                                        \
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        : "r" ((long)(arg1)),"r" ((long)(arg2)),"r" ((long)(arg3))        \
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        : "r0","r1","r2","lr");                                                \
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  __syscall_return(type,__res);                                                \
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}
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#define _syscall4(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4)                \
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type name(type1 arg1, type2 arg2, type3 arg3, type4 arg4) {                                \
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  long __res;                                                                                \
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  __asm__ __volatile__ (                                                                \
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  "mov\tr0,%1\n\t"                                                                        \
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  "mov\tr1,%2\n\t"                                                                        \
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  "mov\tr2,%3\n\t"                                                                        \
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  "mov\tr3,%4\n\t"                                                                        \
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  __syscall(name)                                                                        \
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  "mov\t%0,r0"                                                                                \
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          : "=r" (__res)                                                                        \
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          : "r" ((long)(arg1)),"r" ((long)(arg2)),"r" ((long)(arg3)),"r" ((long)(arg4))        \
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          : "r0","r1","r2","r3","lr");                                                        \
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  __syscall_return(type,__res);                                                                \
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}
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#define _syscall5(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4,type5,arg5)        \
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type name(type1 arg1, type2 arg2, type3 arg3, type4 arg4, type5 arg5) {                        \
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  long __res;                                                                                \
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  __asm__ __volatile__ (                                                                \
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  "mov\tr0,%1\n\t"                                                                        \
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  "mov\tr1,%2\n\t"                                                                        \
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  "mov\tr2,%3\n\t"                                                                        \
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  "mov\tr3,%4\n\t"                                                                        \
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  "mov\tr4,%5\n\t"                                                                        \
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  __syscall(name)                                                                        \
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  "mov\t%0,r0"                                                                                \
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          : "=r" (__res)                                                                        \
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          : "r" ((long)(arg1)),"r" ((long)(arg2)),"r" ((long)(arg3)),"r" ((long)(arg4)),        \
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          "r" ((long)(arg5))                                                                \
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        : "r0","r1","r2","r3","r4","lr");                                                \
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  __syscall_return(type,__res);                                                                \
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}
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_syscall1(int,exit1,int,status);
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_syscall3(int,write,int,fd,const char *,buf, int, len);
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void _start(void)
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{
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    write(1, "Hello World\n", 12);
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    exit1(0);
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}