/*
 * BS2 - simple system call test
 *
 * Warning: The unistd.h header file included in this program must be
 * the one from the built kernel sources, NOT the one from /usr/include.
 * Therefore, compile this program with the following command:
 *
 * gcc -Wall -iquote /lib/modules/`uname -r`/build/include/asm -o ex1 ex1.c
 *
 */

#include <stdio.h>
#include <errno.h>

#include "unistd.h"


#define __syscall_return(type, res) \
do { \
	if ((unsigned long)(res) >= (unsigned long)(-125)) { \
		errno = -(res); \
		res = -1; \
	} \
	return (type) (res); \
} while (0)

#define _syscall0(type,name) \
type name(void) \
{ \
long __res; \
__asm__ volatile ("int $0x80" \
	: "=a" (__res) \
	: "0" (__NR_##name)); \
__syscall_return(type,__res); \
}

#define _syscall1(type,name,type1,arg1) \
type name(type1 arg1) \
{ \
long __res; \
__asm__ volatile ("int $0x80" \
	: "=a" (__res) \
	: "0" (__NR_##name),"b" ((long)(arg1))); \
__syscall_return(type,__res); \
}

#define _syscall2(type,name,type1,arg1,type2,arg2) \
type name(type1 arg1,type2 arg2) \
{ \
long __res; \
__asm__ volatile ("int $0x80" \
	: "=a" (__res) \
	: "0" (__NR_##name),"b" ((long)(arg1)),"c" ((long)(arg2))); \
__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 ("int $0x80" \
	: "=a" (__res) \
	: "0" (__NR_##name),"b" ((long)(arg1)),"c" ((long)(arg2)), \
		  "d" ((long)(arg3))); \
__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 ("int $0x80" \
	: "=a" (__res) \
	: "0" (__NR_##name),"b" ((long)(arg1)),"c" ((long)(arg2)), \
	  "d" ((long)(arg3)),"S" ((long)(arg4))); \
__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 ("int $0x80" \
	: "=a" (__res) \
	: "0" (__NR_##name),"b" ((long)(arg1)),"c" ((long)(arg2)), \
	  "d" ((long)(arg3)),"S" ((long)(arg4)),"D" ((long)(arg5))); \
__syscall_return(type,__res); \
}

#define _syscall6(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4, \
	  type5,arg5,type6,arg6) \
type name (type1 arg1,type2 arg2,type3 arg3,type4 arg4,type5 arg5,type6 arg6) \
{ \
long __res; \
__asm__ volatile ("push %%ebp ; movl %%eax,%%ebp ; movl %1,%%eax ; int $0x80 ; pop %%ebp" \
	: "=a" (__res) \
	: "i" (__NR_##name),"b" ((long)(arg1)),"c" ((long)(arg2)), \
	  "d" ((long)(arg3)),"S" ((long)(arg4)),"D" ((long)(arg5)), \
	  "0" ((long)(arg6))); \
__syscall_return(type,__res); \
}


_syscall0(int, bs2_0)

    
int main(int argc, char *argv[]) {
   int r;

   if ( 0 > (r = bs2_0()) ) {
     perror("call to bs2_0()");
   }

   return 0;
}