STACK_SIZE
loadadr = (sptop + STACK_SIZE + LOAD_ALIGN - 1) & (-LOAD_ALIGN);
#ifndef STACK_SIZE
for (i = 0; i < STACK_SIZE; i++)
REQUIRE_LIBC(d->stack_base = mmap(NULL, STACK_SIZE,
STACK_SIZE);
(void) munmap(d->stack_base, STACK_SIZE);
lwp_data.stack_base = mmap(NULL, STACK_SIZE,
&lwp_data, NULL, lwp_data.stack_base, STACK_SIZE);
(void) munmap(lwp_data.stack_base, STACK_SIZE);