/* Setup thread stack. Hurd/i386 version. Copyright (C) 2000 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with the GNU C Library; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include #include #include /* The stack layout used on the i386 is: ----------------- | ARG | ----------------- | START_ROUTINE | ----------------- | 0 | ----------------- | | | Fast TSD | | | ----------------- We need to reserve __hurd_threadvar_max `unsigned long int's' of (fast) thread-specific data (TSD) for the Hurd. */ /* Set up the stack for THREAD, such that it appears as if START_ROUTINE and ARG were passed to the new thread's entry-point. Return the stack pointer for the new thread. */ static void * stack_setup (struct __pthread *thread, void *(*start_routine)(void *), void *arg) { error_t err; uintptr_t *bottom, *top; /* Calculate the top of the new stack. */ bottom = thread->stackaddr; top = (uintptr_t *) ((uintptr_t) bottom + thread->stacksize); /* Next, make room for the TSDs. */ top -= __hurd_threadvar_max; /* Save the self pointer. */ top[_HURD_THREADVAR_THREAD] = thread; if (start_routine) { /* And then the call frame. */ *--top = (uintptr_t) arg; /* Argument to START_ROUTINE. */ *--top = (uintptr_t) start_routine; *--top = 0; /* Fake return address. */ } if (thread->guardsize) { err = __vm_protect (__mach_task_self (), (vm_address_t) bottom, thread->guardsize, 0, 0); assert_perror (err); } return top; } int __pthread_setup (struct __pthread *thread, void (*entry_point)(void *(*)(void *), void *), void *(*start_routine)(void *), void *arg) { error_t err; thread->mcontext.pc = entry_point; thread->mcontext.sp = stack_setup (thread, start_routine, arg); if (thread->kernel_thread != __mach_thread_self ()) { err = __thread_set_pcsp (thread->kernel_thread, 1, thread->mcontext.pc, 1, thread->mcontext.sp); assert_perror (err); } return 0; }