| /* Copyright (C) 1991-2014 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) |
