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hello-arm.c

#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);
}

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