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authorRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
committerRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
commit28f540f45bbacd939bfd07f213bcad2bf730b1bf (patch)
tree15f07c4c43d635959c6afee96bde71fb1b3614ee /mach/setup-thread.c
downloadglibc-28f540f45bbacd939bfd07f213bcad2bf730b1bf.tar.gz
initial import
Diffstat (limited to 'mach/setup-thread.c')
-rw-r--r--mach/setup-thread.c99
1 files changed, 99 insertions, 0 deletions
diff --git a/mach/setup-thread.c b/mach/setup-thread.c
new file mode 100644
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+++ b/mach/setup-thread.c
@@ -0,0 +1,99 @@
+/* Copyright (C) 1991, 1994, 1995 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., 675 Mass Ave,
+Cambridge, MA 02139, 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 = 0;
+
+ size = stack_size ? *stack_size ? : STACK_SIZE : STACK_SIZE;
+
+ if (stack_base && *stack_base)
+ stack = *stack_base;
+ else if (size == STACK_SIZE)
+ {
+ /* 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 - size - __vm_page_size;
+#else
+ stack = VM_MIN_ADDRESS;
+#endif
+ }
+ else
+ anywhere = 1;
+
+ if (error = __vm_allocate (task, &stack, size + __vm_page_size, anywhere))
+ 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)