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glibc/mach/setup-thread.c
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/* Copyright (C) 1991-2016 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 "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; | |
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; | |
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, | |
(natural_t *) &ts, tssize); | |
} | |
weak_alias (__mach_setup_thread, mach_setup_thread) |