100 lines
3.4 KiB
C
100 lines
3.4 KiB
C
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/* Copyright (C) 1991, 1994, 1995 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <mach.h>
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#include "thread_state.h"
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#include <string.h>
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#include <mach/machine/vm_param.h>
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#include "sysdep.h" /* Defines stack direction. */
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#define STACK_SIZE (16 * 1024 * 1024) /* 16MB, arbitrary. */
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/* Give THREAD a stack and set it to run at PC when resumed.
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If *STACK_SIZE is nonzero, that size of stack is allocated.
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If *STACK_BASE is nonzero, that stack location is used.
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If STACK_BASE is not null it is filled in with the chosen stack base.
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If STACK_SIZE is not null it is filled in with the chosen stack size.
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Regardless, an extra page of red zone is allocated off the end; this
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is not included in *STACK_SIZE. */
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kern_return_t
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__mach_setup_thread (task_t task, thread_t thread, void *pc,
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vm_address_t *stack_base, vm_size_t *stack_size)
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{
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kern_return_t error;
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struct machine_thread_state ts;
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mach_msg_type_number_t tssize = MACHINE_THREAD_STATE_COUNT;
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vm_address_t stack;
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vm_size_t size;
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int anywhere = 0;
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size = stack_size ? *stack_size ? : STACK_SIZE : STACK_SIZE;
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if (stack_base && *stack_base)
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stack = *stack_base;
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else if (size == STACK_SIZE)
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{
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/* Cthreads has a bug that makes its stack-probing code fail if
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the stack is too low in memory. It's bad to try and fix it there
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until cthreads is integrated into libc, so we'll just do it here
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by requesting a high address. When the cthreads bug is fixed,
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this assignment to STACK should be changed to 0, and the ANYWHERE
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argument to vm_allocate should be changed to 0. This comment should
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be left, however, in order to confuse people who wonder why its
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here. (Though perhaps that last sentence (and this one) should
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be deleted to maximize the effect.) */
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#ifdef STACK_GROWTH_DOWN
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stack = VM_MAX_ADDRESS - size - __vm_page_size;
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#else
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stack = VM_MIN_ADDRESS;
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#endif
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}
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else
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anywhere = 1;
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if (error = __vm_allocate (task, &stack, size + __vm_page_size, anywhere))
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return error;
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if (stack_size)
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*stack_size = size;
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memset (&ts, 0, sizeof (ts));
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MACHINE_THREAD_STATE_SET_PC (&ts, pc);
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#ifdef STACK_GROWTH_DOWN
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if (stack_base)
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*stack_base = stack + __vm_page_size;
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ts.SP = stack + __vm_page_size + size;
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#elif defined (STACK_GROWTH_UP)
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if (stack_base)
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*stack_base = stack;
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ts.SP = stack;
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stack += size;
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#else
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#error stack direction unknown
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#endif
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/* Create the red zone. */
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if (error = __vm_protect (task, stack, __vm_page_size, 0, VM_PROT_NONE))
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return error;
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return __thread_set_state (thread, MACHINE_THREAD_STATE_FLAVOR,
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(int *) &ts, tssize);
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}
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weak_alias (__mach_setup_thread, mach_setup_thread)
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