1 #define __NR_SYSCALL_BASE	0x900000

     2 #define __NR_exit1			(__NR_SYSCALL_BASE+  1)

     3 #define __NR_write			(__NR_SYSCALL_BASE+  4)

     4 

     5 #define __sys2(x) #x

     6 #define __sys1(x) __sys2(x)

     7 

     8 #ifndef __syscall

     9 #define __syscall(name) "swi\t" __sys1(__NR_##name) "\n\t"

    10 #endif

    11 

    12 #define __syscall_return(type, res)					\

    13 do {									\

    14 	return (type) (res);						\

    15 } while (0)

    16 

    17 #define _syscall0(type,name)						\

    18 type name(void) {							\

    19   long __res;								\

    20   __asm__ __volatile__ (						\

    21   __syscall(name)							\

    22   "mov %0,r0"								\

    23   :"=r" (__res) : : "r0","lr");						\

    24   __syscall_return(type,__res);						\

    25 }

    26 

    27 #define _syscall1(type,name,type1,arg1)					\

    28 type name(type1 arg1) {							\

    29   long __res;								\

    30   __asm__ __volatile__ (						\

    31   "mov\tr0,%1\n\t"							\

    32   __syscall(name)							\

    33   "mov %0,r0"								\

    34         : "=r" (__res)							\

    35         : "r" ((long)(arg1))						\

    36 	: "r0","lr");							\

    37   __syscall_return(type,__res);						\

    38 }

    39 

    40 #define _syscall2(type,name,type1,arg1,type2,arg2)			\

    41 type name(type1 arg1,type2 arg2) {					\

    42   long __res;								\

    43   __asm__ __volatile__ (						\

    44   "mov\tr0,%1\n\t"							\

    45   "mov\tr1,%2\n\t"							\

    46   __syscall(name)							\

    47   "mov\t%0,r0"								\

    48         : "=r" (__res)							\

    49         : "r" ((long)(arg1)),"r" ((long)(arg2))				\

    50 	: "r0","r1","lr");						\

    51   __syscall_return(type,__res);						\

    52 }

    53 

    54 

    55 #define _syscall3(type,name,type1,arg1,type2,arg2,type3,arg3)		\

    56 type name(type1 arg1,type2 arg2,type3 arg3) {				\

    57   long __res;								\

    58   __asm__ __volatile__ (						\

    59   "mov\tr0,%1\n\t"							\

    60   "mov\tr1,%2\n\t"							\

    61   "mov\tr2,%3\n\t"							\

    62   __syscall(name)							\

    63   "mov\t%0,r0"								\

    64         : "=r" (__res)							\

    65         : "r" ((long)(arg1)),"r" ((long)(arg2)),"r" ((long)(arg3))	\

    66         : "r0","r1","r2","lr");						\

    67   __syscall_return(type,__res);						\

    68 }

    69 

    70 

    71 #define _syscall4(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4)		\

    72 type name(type1 arg1, type2 arg2, type3 arg3, type4 arg4) {				\

    73   long __res;										\

    74   __asm__ __volatile__ (								\

    75   "mov\tr0,%1\n\t"									\

    76   "mov\tr1,%2\n\t"									\

    77   "mov\tr2,%3\n\t"									\

    78   "mov\tr3,%4\n\t"									\

    79   __syscall(name)									\

    80   "mov\t%0,r0"										\

    81   	: "=r" (__res)									\

    82   	: "r" ((long)(arg1)),"r" ((long)(arg2)),"r" ((long)(arg3)),"r" ((long)(arg4))	\

    83   	: "r0","r1","r2","r3","lr");							\

    84   __syscall_return(type,__res);								\

    85 }

    86 

    87 

    88 #define _syscall5(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4,type5,arg5)	\

    89 type name(type1 arg1, type2 arg2, type3 arg3, type4 arg4, type5 arg5) {			\

    90   long __res;										\

    91   __asm__ __volatile__ (								\

    92   "mov\tr0,%1\n\t"									\

    93   "mov\tr1,%2\n\t"									\

    94   "mov\tr2,%3\n\t"									\

    95   "mov\tr3,%4\n\t"									\

    96   "mov\tr4,%5\n\t"									\

    97   __syscall(name)									\

    98   "mov\t%0,r0"										\

    99   	: "=r" (__res)									\

   100   	: "r" ((long)(arg1)),"r" ((long)(arg2)),"r" ((long)(arg3)),"r" ((long)(arg4)),	\

   101 	  "r" ((long)(arg5))								\

   102 	: "r0","r1","r2","r3","r4","lr");						\

   103   __syscall_return(type,__res);								\

   104 }

   105 

   106 _syscall1(int,exit1,int,status);

   107 _syscall3(int,write,int,fd,const char *,buf, int, len);

   108 

   109 void _start(void)

   110 {

   111     write(1, "Hello World\n", 12);

   112     exit1(0);

   113 }