mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-23 11:20:07 +00:00
100 lines
3.4 KiB
C
100 lines
3.4 KiB
C
/* Copyright (C) 1991, 1994, 1995 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., 675 Mass Ave,
|
|
Cambridge, MA 02139, USA. */
|
|
|
|
#include <mach.h>
|
|
#include "thread_state.h"
|
|
#include <string.h>
|
|
#include <mach/machine/vm_param.h>
|
|
#include "sysdep.h" /* Defines stack direction. */
|
|
|
|
#define STACK_SIZE (16 * 1024 * 1024) /* 16MB, arbitrary. */
|
|
|
|
/* Give THREAD a stack and set it to run at PC when resumed.
|
|
If *STACK_SIZE is nonzero, that size of stack is allocated.
|
|
If *STACK_BASE is nonzero, that stack location is used.
|
|
If STACK_BASE is not null it is filled in with the chosen stack base.
|
|
If STACK_SIZE is not null it is filled in with the chosen stack size.
|
|
Regardless, an extra page of red zone is allocated off the end; this
|
|
is not included in *STACK_SIZE. */
|
|
|
|
kern_return_t
|
|
__mach_setup_thread (task_t task, thread_t thread, void *pc,
|
|
vm_address_t *stack_base, vm_size_t *stack_size)
|
|
{
|
|
kern_return_t error;
|
|
struct machine_thread_state ts;
|
|
mach_msg_type_number_t tssize = MACHINE_THREAD_STATE_COUNT;
|
|
vm_address_t stack;
|
|
vm_size_t size;
|
|
int anywhere = 0;
|
|
|
|
size = stack_size ? *stack_size ? : STACK_SIZE : STACK_SIZE;
|
|
|
|
if (stack_base && *stack_base)
|
|
stack = *stack_base;
|
|
else if (size == STACK_SIZE)
|
|
{
|
|
/* Cthreads has a bug that makes its stack-probing code fail if
|
|
the stack is too low in memory. It's bad to try and fix it there
|
|
until cthreads is integrated into libc, so we'll just do it here
|
|
by requesting a high address. When the cthreads bug is fixed,
|
|
this assignment to STACK should be changed to 0, and the ANYWHERE
|
|
argument to vm_allocate should be changed to 0. This comment should
|
|
be left, however, in order to confuse people who wonder why its
|
|
here. (Though perhaps that last sentence (and this one) should
|
|
be deleted to maximize the effect.) */
|
|
#ifdef STACK_GROWTH_DOWN
|
|
stack = VM_MAX_ADDRESS - size - __vm_page_size;
|
|
#else
|
|
stack = VM_MIN_ADDRESS;
|
|
#endif
|
|
}
|
|
else
|
|
anywhere = 1;
|
|
|
|
if (error = __vm_allocate (task, &stack, size + __vm_page_size, anywhere))
|
|
return error;
|
|
|
|
if (stack_size)
|
|
*stack_size = size;
|
|
|
|
memset (&ts, 0, sizeof (ts));
|
|
MACHINE_THREAD_STATE_SET_PC (&ts, pc);
|
|
#ifdef STACK_GROWTH_DOWN
|
|
if (stack_base)
|
|
*stack_base = stack + __vm_page_size;
|
|
ts.SP = stack + __vm_page_size + size;
|
|
#elif defined (STACK_GROWTH_UP)
|
|
if (stack_base)
|
|
*stack_base = stack;
|
|
ts.SP = stack;
|
|
stack += size;
|
|
#else
|
|
#error stack direction unknown
|
|
#endif
|
|
|
|
/* Create the red zone. */
|
|
if (error = __vm_protect (task, stack, __vm_page_size, 0, VM_PROT_NONE))
|
|
return error;
|
|
|
|
return __thread_set_state (thread, MACHINE_THREAD_STATE_FLAVOR,
|
|
(int *) &ts, tssize);
|
|
}
|
|
|
|
weak_alias (__mach_setup_thread, mach_setup_thread)
|