blob: ceb906f7f50e9a1e1a4e4bdf5b8d85aa3d6f110e [file] [log] [blame]
void __attribute__((naked)) incomplete_cas(int *a, int *b) {
// Stop at the first instruction (an sc without a corresponding lr), then make
// a step instruction and ensure that execution stops at the next instruction
// (and a5, a2, a4).
asm volatile("1:\n\t"
"sc.w a5, a1, (a3)\n\t"
"and a5, a2, a4\n\t"
"beq a5, a1, 2f\n\t"
"xor a5, a2, a0\n\t"
"and a5, a5, a4\n\t"
"xor a5, a2, a5\n\t"
"sc.w a5, a1, (a3)\n\t"
"bnez a5, 1b\n\t"
"2:\n\t"
"ret\n\t");
}
int main() {
int a = 4;
int b = 2;
incomplete_cas(&a, &b);
}