/* Copyright (C) 1991, 1994, 1995, 1997 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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; 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, (int *) &ts, tssize); } weak_alias (__mach_setup_thread, mach_setup_thread)