int NaClAppThreadAllocSegCtor(struct NaClAppThread *natp,
struct NaClApp *nap,
int is_privileged,
uintptr_t usr_entry,
uintptr_t usr_stack_ptr,
uintptr_t sys_tdb_base,
size_t tdb_size) {
uint32_t tls_idx;
uint32_t tdb_size32;
if (tdb_size > UINT32_MAX) {
NaClLog(LOG_ERROR, "Requested TDB size is too large");
return 0;
} else {
tdb_size32 = (uint32_t) tdb_size;
}
/*
* Even though we don't know what segment base/range should gs/r9/nacl_tls_idx
* select, we still need one, since it identifies the thread when we context
* switch back. This use of a dummy tls is only needed for the main thread,
* which is expected to invoke the tls_init syscall from its crt code (before
* main or much of libc can run). Other threads are spawned with the tdb
* address and size as a parameter.
*/
tls_idx = NaClTlsAllocate(natp, (void *) sys_tdb_base, tdb_size32);
NaClLog(4,
"NaClAppThreadAllocSegCtor: stack_ptr 0x%08"NACL_PRIxPTR", "
"tls_idx 0x%02"NACL_PRIx32"\n",
usr_stack_ptr, tls_idx);
if (0 == tls_idx) {
NaClLog(LOG_ERROR, "No tls for thread, num_thread %d\n", nap->num_threads);
return 0;
}
return NaClAppThreadCtor(natp,
nap,
is_privileged,
usr_entry,
usr_stack_ptr,
tls_idx,
sys_tdb_base);
}
struct NaClAppThread *NaClAppThreadMake(struct NaClApp *nap,
uintptr_t usr_entry,
uintptr_t usr_stack_ptr,
uint32_t user_tls1,
uint32_t user_tls2) {
struct NaClAppThread *natp;
uint32_t tls_idx;
natp = NaClAlignedMalloc(sizeof *natp, __alignof(struct NaClAppThread));
if (natp == NULL) {
return NULL;
}
NaClLog(4, " natp = 0x%016"NACL_PRIxPTR"\n", (uintptr_t) natp);
NaClLog(4, " nap = 0x%016"NACL_PRIxPTR"\n", (uintptr_t) nap);
NaClLog(4, "usr_stack_ptr = 0x%016"NACL_PRIxPTR"\n", usr_stack_ptr);
/*
* Set these early, in case NaClTlsAllocate() wants to examine them.
*/
natp->nap = nap;
natp->thread_num = -1; /* illegal index */
natp->host_thread_is_defined = 0;
memset(&natp->host_thread, 0, sizeof(natp->host_thread));
/*
* Even though we don't know what segment base/range should gs/r9/nacl_tls_idx
* select, we still need one, since it identifies the thread when we context
* switch back. This use of a dummy tls is only needed for the main thread,
* which is expected to invoke the tls_init syscall from its crt code (before
* main or much of libc can run). Other threads are spawned with the thread
* pointer address as a parameter.
*/
tls_idx = NaClTlsAllocate(natp);
if (NACL_TLS_INDEX_INVALID == tls_idx) {
NaClLog(LOG_ERROR, "No tls for thread, num_thread %d\n", nap->num_threads);
goto cleanup_free;
}
NaClThreadContextCtor(&natp->user, nap, usr_entry, usr_stack_ptr, tls_idx);
NaClTlsSetTlsValue1(natp, user_tls1);
NaClTlsSetTlsValue2(natp, user_tls2);
natp->signal_stack = NULL;
natp->exception_stack = 0;
natp->exception_flag = 0;
if (!NaClMutexCtor(&natp->mu)) {
goto cleanup_free;
}
if (!NaClSignalStackAllocate(&natp->signal_stack)) {
goto cleanup_mu;
}
if (!NaClMutexCtor(&natp->suspend_mu)) {
goto cleanup_mu;
}
natp->suspend_state = NACL_APP_THREAD_TRUSTED;
natp->suspended_registers = NULL;
natp->fault_signal = 0;
natp->dynamic_delete_generation = 0;
return natp;
cleanup_mu:
NaClMutexDtor(&natp->mu);
if (NULL != natp->signal_stack) {
NaClSignalStackFree(&natp->signal_stack);
natp->signal_stack = NULL;
}
cleanup_free:
NaClAlignedFree(natp);
return NULL;
}