toolchain/gcc/libgloss/iq2000/trap.c

   1 // Perform a system call.
   2 // Unused parameters should be set to 0.
   3 int __trap0(unsigned long func, unsigned long p1, unsigned long p2, unsigned long p3)
   4 {
   5   int ret = 0;
   6   asm volatile ("nop\n\tor %%4,%%0,%0" : : "r"(func));
   7   asm volatile ("nop\n\tor %%5,%%0,%0" : : "r"(p1));
   8   asm volatile ("nop\n\tor %%6,%%0,%0" : : "r"(p2));
   9   asm volatile ("nop\n\tor %%7,%%0,%0" : : "r"(p3));
  10   asm volatile ("nop\n\tor %%11,%%0,%0" : : "r"(func));
  11   asm volatile ("syscall\n\tnop\n\tor %0,%%0,%%2" : "=r"(ret));
  12   return ret;
  13 }