fusl/arch/mips/atomic_arch.h

#define a_ll a_ll
static inline int a_ll(volatile int* p) {
  int v;
  __asm__ __volatile__(
      ".set push ; .set mips2\n\t"
      "ll %0, %1"
      "\n\t.set pop"
      : "=r"(v)
      : "m"(*p));
  return v;
}

#define a_sc a_sc
static inline int a_sc(volatile int* p, int v) {
  int r;
  __asm__ __volatile__(
      ".set push ; .set mips2\n\t"
      "sc %0, %1"
      "\n\t.set pop"
      : "=r"(r), "=m"(*p)
      : "0"(v)
      : "memory");
  return r;
}

#define a_barrier a_barrier
static inline void a_barrier() {
  /* mips2 sync, but using too many directives causes
   * gcc not to inline it, so encode with .long instead. */
  __asm__ __volatile__(".long 0xf" : : : "memory");
#if 0
	__asm__ __volatile__ (
		".set push ; .set mips2 ; sync ; .set pop"
		: : : "memory");
#endif
}

#define a_pre_llsc a_barrier
#define a_post_llsc a_barrier