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