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// Perform a system call.

// Unused parameters should be set to 0.

int __trap0(unsigned long func, unsigned long p1, unsigned long p2, unsigned long p3)

{

  int ret = 0;

  asm volatile ("nop\n\tor %%4,%%0,%0" : : "r"(func));

  asm volatile ("nop\n\tor %%5,%%0,%0" : : "r"(p1));

  asm volatile ("nop\n\tor %%6,%%0,%0" : : "r"(p2));

  asm volatile ("nop\n\tor %%7,%%0,%0" : : "r"(p3));

  asm volatile ("nop\n\tor %%11,%%0,%0" : : "r"(func));

  asm volatile ("syscall\n\tnop\n\tor %0,%%0,%%2" : "=r"(ret));

  return ret;

}