include/syscall.h

   1 #ifndef SYSCALL_H
   2 #define SYSCALL_H
   3
   4 extern void syscall_interrupt(void);
   5 extern int syscall(int);
   6
   7
   8 struct syscall_params {
   9         unsigned long first;
  10         unsigned long second;
  11         unsigned long third;
  12 };
  13
  14 extern struct syscall_params *scp;
  15
  16 #define _syscall0(type,name) \
  17 type name(void) \
  18 { \
  19 long __res; \
  20 __asm__ volatile ("int $0x80" \
  21         : "=a" (__res) \
  22         : "0" (__NR_##name)); \
  23 if (__res >= 0) \
  24         return (type) __res; \
  25 return -1; \
  26 }
  27
  28 #define _syscall1(type,name,atype,a) \
  29 type name(atype a) \
  30 { \
  31 long __res; \
  32 __asm__ volatile ("int $0x80" \
  33         : "=a" (__res) \
  34         : "0" (__NR_##name),"b" ((long)(a))); \
  35 if (__res >= 0) \
  36         return (type) __res; \
  37 return -1; \
  38 }
  39
  40 #define _syscall2(type,name,atype,a,btype,b) \
  41 type name(atype a,btype b) \
  42 { \
  43 long __res; \
  44 __asm__ volatile ("int $0x80" \
  45         : "=a" (__res) \
  46         : "0" (__NR_##name),"b" ((long)(a)),"c" ((long)(b))); \
  47 if (__res >= 0) \
  48         return (type) __res; \
  49 return -1; \
  50 }
  51
  52 #define _syscall3(type,name,atype,a,btype,b,ctype,c) \
  53 type name(atype a,btype b,ctype c) \
  54 { \
  55 long __res; \
  56 __asm__ volatile ("int $0x80" \
  57         : "=a" (__res) \
  58         : "a" (__NR_##name),"b" ((long)(a)),"c" ((long)(b)),"d" ((long)(c))); \
  59 if (__res>=0) \
  60         return (type) __res; \
  61 return -1; \
  62 }
  63
  64 #endif /* syscall.h */