34     void* base;  in cov_shm_alloc()  local
38     base = memalign(PAGE_SIZE, shm_len);  in cov_shm_alloc()
39     if (!base) {  in cov_shm_alloc()
44     rc = memref_create(base, shm_len, MMAP_FLAG_PROT_RW);  in cov_shm_alloc()
52     shm->base = base;  in cov_shm_alloc()
64     free(shm->base);  in cov_shm_free()
67     shm->base = NULL;  in cov_shm_free()
72     void* base = mmap(0, len, MMAP_FLAG_PROT_RW, 0, memref, 0);  in cov_shm_mmap()  local
73     if (base == MAP_FAILED) {  in cov_shm_mmap()
79     shm->base = base;  in cov_shm_mmap()
87     munmap(shm->base, shm->len);  in cov_shm_munmap()
90     shm->base = NULL;  in cov_shm_munmap()
98         WRITE_ONCE(*((uint8_t*)(shm->base) + i), 0);  in cov_shm_clear()