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/* Copyright (C) 1991-2018 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
<http://www.gnu.org/licenses/>. */
#include <mach.h>
#include <thread_state.h>
#include <string.h>
#include <mach/machine/vm_param.h>
#include <ldsodefs.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;
tcbhead_t *tcb;
size = stack_size ? *stack_size ? : STACK_SIZE : STACK_SIZE;
stack = stack_base ? *stack_base ? : 0 : 0;
anywhere = !stack_base || !*stack_base;
error = __vm_allocate (task, &stack, size + __vm_page_size, anywhere);
if (error)
return error;
tcb = _dl_allocate_tls(NULL);
if (tcb == NULL)
return KERN_RESOURCE_SHORTAGE;
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;
if (error = __thread_set_state (thread, MACHINE_NEW_THREAD_STATE_FLAVOR,
(natural_t *) &ts, tssize))
return error;
if (error = __thread_get_state (thread, MACHINE_THREAD_STATE_FLAVOR,
(natural_t *) &ts, &tssize))
return error;
assert (tssize == MACHINE_THREAD_STATE_COUNT);
_hurd_tls_new(thread, &ts, tcb);
error = __thread_set_state (thread, MACHINE_THREAD_STATE_FLAVOR,
(natural_t *) &ts, tssize);
return error;
}
weak_alias (__mach_setup_thread, mach_setup_thread)
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