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/* Setup thread stack. Hurd/i386 version.
Copyright (C) 2000, 2002, 2005, 2008 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 <stdint.h>
#include <assert.h>
#include <mach.h>
#include <pt-internal.h>
/* 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] = (uintptr_t) thread;
if (start_routine)
{
/* And then the call frame. */
top -= 2;
top = (uintptr_t *) ((uintptr_t) top & ~0xf);
top[1] = (uintptr_t) arg; /* Argument to START_ROUTINE. */
top[0] = (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;
mach_port_t ktid;
thread->mcontext.pc = entry_point;
thread->mcontext.sp = stack_setup (thread, start_routine, arg);
ktid = __mach_thread_self ();
if (thread->kernel_thread != ktid)
{
err = __thread_set_pcsp (thread->kernel_thread,
1, thread->mcontext.pc,
1, thread->mcontext.sp);
assert_perror (err);
}
__mach_port_deallocate (__mach_task_self (), ktid);
return 0;
}
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