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80 lines
2.6 KiB
C
80 lines
2.6 KiB
C
/* Copyright (C) 1991-2017 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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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;
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size = stack_size ? *stack_size ? : STACK_SIZE : STACK_SIZE;
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stack = stack_base ? *stack_base ? : 0 : 0;
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anywhere = !stack_base || !*stack_base;
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error = __vm_allocate (task, &stack, size + __vm_page_size, anywhere);
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if (error)
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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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(natural_t *) &ts, tssize);
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}
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weak_alias (__mach_setup_thread, mach_setup_thread)
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