mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-12 06:10:10 +00:00
111 lines
3.3 KiB
C
111 lines
3.3 KiB
C
/* Setup thread stack. Hurd/i386 version.
|
|
Copyright (C) 2000-2020 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 Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#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 |
|
|
-----------------
|
|
*/
|
|
|
|
/* 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
|
|
+ ((thread->guardsize + __vm_page_size - 1)
|
|
/ __vm_page_size) * __vm_page_size);
|
|
|
|
if (start_routine != NULL)
|
|
{
|
|
/* And then the call frame. */
|
|
top -= 3;
|
|
top = (uintptr_t *) ((uintptr_t) top & ~0xf);
|
|
top[2] = (uintptr_t) arg; /* Argument to START_ROUTINE. */
|
|
top[1] = (uintptr_t) start_routine;
|
|
top[0] = (uintptr_t) thread;
|
|
*--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) (struct __pthread *, void *(*)(void *),
|
|
void *), void *(*start_routine) (void *),
|
|
void *arg)
|
|
{
|
|
tcbhead_t *tcb;
|
|
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)
|
|
/* Fix up the TCB for the main thread. The C library has already
|
|
installed a TCB, which we want to keep using. This TCB must not
|
|
be freed so don't register it in the thread structure. On the
|
|
other hand, it's not yet possible to reliably release a TCB.
|
|
Leave the unused one registered so that it doesn't leak. The
|
|
only thing left to do is to correctly set the `self' member in
|
|
the already existing TCB. */
|
|
tcb = THREAD_SELF;
|
|
else
|
|
{
|
|
err = __thread_set_pcsptp (thread->kernel_thread,
|
|
1, thread->mcontext.pc,
|
|
1, thread->mcontext.sp,
|
|
1, thread->tcb);
|
|
assert_perror (err);
|
|
tcb = thread->tcb;
|
|
}
|
|
__mach_port_deallocate (__mach_task_self (), ktid);
|
|
|
|
tcb->self = thread->kernel_thread;
|
|
|
|
return 0;
|
|
}
|