__arch_chacha20_blocks_nostack
extern void __arch_chacha20_blocks_nostack(u8 *dst_bytes, const u32 *key, u32 *counter, size_t nblocks);
__arch_chacha20_blocks_nostack(buffer, state->key, counter, nblocks);
__arch_chacha20_blocks_nostack(state->batch_key, state->key, counter,
__arch_chacha20_blocks_nostack(output2, key, counter2, split);
__arch_chacha20_blocks_nostack(output2 + split * BLOCK_SIZE, key, counter2, BLOCKS - split);
__arch_chacha20_blocks_nostack(output2, key, counter2, BLOCKS);
__arch_chacha20_blocks_nostack(output2, key, counter2, BLOCKS);