-/* Copyright (C) 1991, 1994 Free Software Foundation, Inc.
-This file is part of the GNU C Library.
+/* 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 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.
+ 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., 675 Mass Ave,
-Cambridge, MA 02139, USA. */
+ 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. */
+/* 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)
+__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;
- /* Cthreads has a bug that makes its stack-probing code fail if
- the stack is too low in memory. It's bad to try and fix it there
- until cthreads is integrated into libc, so we'll just do it here
- by requesting a high address. When the cthreads bug is fixed,
- this assignment to STACK should be changed to 0, and the ANYWHERE
- argument to vm_allocate should be changed to 0. This comment should
- be left, however, in order to confuse people who wonder why its
- here. (Though perhaps that last sentence (and this one) should
- be deleted to maximize the effect.) */
-#ifdef STACK_GROWTH_DOWN
- stack = VM_MAX_ADDRESS - STACK_SIZE - __vm_page_size;
-#else
- stack = VM_MIN_ADDRESS;
-#endif
+ size = stack_size ? *stack_size ? : STACK_SIZE : STACK_SIZE;
+ stack = stack_base ? *stack_base ? : 0 : 0;
+ anywhere = !stack_base || !*stack_base;
- if (error = __vm_allocate (task, &stack, STACK_SIZE + __vm_page_size, 0))
+ error = __vm_allocate (task, &stack, size + __vm_page_size, anywhere);
+ if (error)
return error;
- /* Create a red zone */
- if (error = __vm_protect (task, stack, __vm_page_size, 0, 0))
- return error;
-
+ if (stack_size)
+ *stack_size = size;
+
memset (&ts, 0, sizeof (ts));
- ts.PC = (int) pc;
+ MACHINE_THREAD_STATE_SET_PC (&ts, pc);
#ifdef STACK_GROWTH_DOWN
- ts.SP = stack + STACK_SIZE;
+ 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)
projects / kopensolaris-gnu / glibc.git / blobdiff