int sl_fcall_mngr_clone(struct sl_fcall_mngr* mngr, struct sl_fcall_mngr* untrusted)
{
PANIC_ON(!sgx_is_outside_enclave(untrusted, sizeof(*untrusted)));
sgx_lfence();
BUG_ON(mngr == NULL);
BUG_ON(untrusted == NULL);
sl_fcall_type_t type_u = untrusted->fmn_type;
PANIC_ON((type_u != SL_FCALL_TYPE_ECALL) && (type_u != SL_FCALL_TYPE_OCALL));
mngr->fmn_type = type_u;
int ret = sl_siglines_clone(&mngr->fmn_siglns,
&untrusted->fmn_siglns,
can_type_process(type_u) ? process_fcall : NULL);
if (ret) return ret;
//check that we have right call managers.
//i.e ecall manager on untrusted or ocall manager on trusted side
PANIC_ON(fcall_type2direction(type_u) != sl_siglines_get_direction(&mngr->fmn_siglns));
uint32_t num_lines = sl_siglines_size(&mngr->fmn_siglns);
BUG_ON(untrusted->fmn_bufs == NULL);
struct sl_fcall_buf** bufs_u = untrusted->fmn_bufs;
PANIC_ON(!sgx_is_outside_enclave(bufs_u, sizeof(bufs_u[0]) * num_lines));
sgx_lfence();
mngr->fmn_bufs = bufs_u;
mngr->fmn_call_table = NULL;
return 0;
}
int sl_siglines_clone(struct sl_siglines* sglns,
struct sl_siglines* untrusted,
sl_sighandler_t handler)
{
PANIC_ON(!sgx_is_outside_enclave(untrusted, sizeof(*untrusted)));
sgx_lfence();
sl_siglines_dir_t dir = untrusted->dir;
PANIC_ON((dir != SL_SIGLINES_DIR_T2U) && (dir != SL_SIGLINES_DIR_U2T));
BUG_ON(sglns == NULL);
sglns->dir = dir;
BUG_ON(is_direction_sender(dir) && (handler != NULL));
uint32_t num_lines = untrusted->num_lines;
if ((num_lines <= 0) || ((num_lines % NBITS_PER_UINT64) != 0))
return -EINVAL;
sglns->num_lines = num_lines;
uint32_t nlong = num_lines / NBITS_PER_UINT64;
BUG_ON(untrusted->event_lines == NULL);
uint64_t* event_lines_u = untrusted->event_lines;
PANIC_ON(!sgx_is_outside_enclave(event_lines_u, sizeof(uint64_t) * nlong));
sgx_lfence();
sglns->event_lines = event_lines_u;
uint64_t* free_lines = NULL;
if (is_direction_sender(dir))
{
free_lines = malloc(sizeof(uint64_t) * nlong);
if (free_lines == NULL)
return -ENOMEM;
for (uint32_t i = 0; i < nlong; i++)
free_lines[i] = (uint64_t)(-1);// 1's -> free
}
sglns->free_lines = free_lines;
sglns->handler = handler;
return 0;
}
int create_task(task_func program, size_t stack_size, struct task_info **task)
{
PANIC_ON(program == NULL, "Program pointer cannot be NULL");
PANIC_ON(stack_size == 0, "Cannot create task with stack size of 0.");
*task = malloc(sizeof(struct task_info));
if(!*task)
return -1;
uint8_t *stack = (uint8_t*)malloc(stack_size);
uint8_t *stack_base = stack + stack_size;
if(!stack) {
free(*task);
return -1;
}
memory_zero(stack, stack_size);
(*task)->stack_ptr = stack;
(*task)->stack_base = stack + stack_size;
(*task)->current_sp = stack + stack_size;
(*task)->program = program;
stack_push(*task, 514); // EFLAGS (No idea what to put here, I inspected EFLAGS at some random location and found it had the value 514)
stack_push(*task, 0x08); // code segment
stack_push(*task, (uint32_t)program); // EIP
stack_push(*task, 0x0); // edi
stack_push(*task, 0x0); // esi
stack_push(*task, 0x0); // ebx
stack_push(*task, 0x0); // edx
stack_push(*task, 0x0); // ecx
stack_push(*task, 0x0); // eax
char buf[92];
uint32_t *ebp = (uint32_t*)(*task)->stack_base;
uint32_t *esp = (uint32_t*)(*task)->current_sp;
snprintf(buf, 92, "DEBUG: created new task with EBP: %d, ESP: %d\n", 2, ebp, esp);
print(buf);
return 0;
}
/* Override the weak symbol defined in tRTS */
sgx_status_t do_init_switchless(struct sl_uswitchless* handle)
{
PANIC_ON(!sgx_is_outside_enclave(handle, sizeof(*handle)));
sgx_lfence();
if (lock_cmpxchg64((uint64_t*)&sl_uswitchless_handle, (uint64_t)NULL, (uint64_t)handle) != (uint64_t)NULL)
{
return SGX_ERROR_UNEXPECTED;
}
return SGX_SUCCESS;
}