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/* Setup thread stack. Viengoos/i386 version.
Copyright (C) 2000, 2002, 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 <l4.h>
#include <pt-internal.h>
/* The stack layout used on the i386 is:
-----------------
| ARG |
-----------------
| START_ROUTINE |
-----------------
| Return address |
----------------- <- %ebp
| Frame pointer |
-----------------
We do the following: setup the stack to return to the entry routine.
*/
/* The stack contains:
arg
start_routine
0 <- fake return address
C entry_point
*/
extern uintptr_t _pthread_entry_point;
__asm__ ("\n\
.globl _pthread_entry_point, __pthread_entry_point\n\
_pthread_entry_point:\n\
__pthread_entry_point:\n\
pushl $0\n\
popf\n\
\n\
xor %ebp, %ebp\n\
ret\n");
/* 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. We also take the
opportunity to install THREAD in our utcb. */
static void *
stack_setup (struct __pthread *thread,
void *(*start_routine)(void *), void *arg,
void (*entry_point)(void *(*)(void *), void *))
{
uintptr_t *top;
/* Calculate top of the new stack. */
top = (uintptr_t *) ((uintptr_t) thread->stackaddr + thread->stacksize);
/* Align on 0x10 for MMX operations. */
top = (uintptr_t *) ((uintptr_t) top & ~0xf);
if (start_routine)
{
/* Set up call frame. */
*--top = (uintptr_t) arg; /* Argument to START_ROUTINE. */
*--top = (uintptr_t) start_routine;
*--top = 0; /* Fake return address. */
*--top = (uintptr_t) entry_point;
}
/* We need 4 pages of stack to avoid faulting before we have set up
the activation area. Make it so. */
int i;
for (i = 1; i < 4; i ++)
top[-i * PAGESIZE] = 0;
return top;
}
int
__pthread_setup (struct __pthread *thread,
void (*entry_point)(void *(*)(void *), void *),
void *(*start_routine)(void *), void *arg)
{
thread->mcontext.pc = (void *) &_pthread_entry_point;
thread->mcontext.sp = (void *) stack_setup (thread, start_routine, arg,
entry_point);
return 0;
}
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