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-rw-r--r--libthreads/stack.c65
1 files changed, 40 insertions, 25 deletions
diff --git a/libthreads/stack.c b/libthreads/stack.c
index 322934a1..bc4ef8cd 100644
--- a/libthreads/stack.c
+++ b/libthreads/stack.c
@@ -1,102 +1,105 @@
-/*
+/*
* Mach Operating System
* Copyright (c) 1991,1990 Carnegie Mellon University
* All Rights Reserved.
- *
+ *
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
- *
+ *
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
- *
+ *
* Carnegie Mellon requests users of this software to return to
- *
+ *
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
- *
+ *
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*/
/*
* HISTORY
- * $Log: stack.c,v $
+ * $Log: stack.c,v $
+ * Revision 1.4 1994/05/05 16:00:09 roland
+ * entered into RCS
+ *
* Revision 2.13 92/01/14 16:48:54 rpd
* Fixed addr_range_check to deallocate the object port from vm_region.
* [92/01/14 rpd]
- *
+ *
* Revision 2.12 92/01/03 20:37:10 dbg
* Export cthread_stack_size, and use it if non-zero instead of
* probing the stack. Fix error in deallocating unused initial
* stack (STACK_GROWTH_UP case).
* [91/08/28 dbg]
- *
+ *
* Revision 2.11 91/07/31 18:39:34 dbg
* Fix some bad stack references (stack direction).
* [91/07/30 17:36:50 dbg]
- *
+ *
* Revision 2.10 91/05/14 17:58:49 mrt
* Correcting copyright
- *
+ *
* Revision 2.9 91/02/14 14:21:08 mrt
* Added new Mach copyright
* [91/02/13 12:41:35 mrt]
- *
+ *
* Revision 2.8 90/11/05 18:10:46 rpd
* Added cproc_stack_base. Add stack_fork_child().
* [90/11/01 rwd]
- *
+ *
* Revision 2.7 90/11/05 14:37:51 rpd
* Fixed addr_range_check for new vm_region semantics.
* [90/11/02 rpd]
- *
+ *
* Revision 2.6 90/10/12 13:07:34 rpd
* Deal with positively growing stacks.
* [90/10/10 rwd]
* Deal with initial user stacks that are not perfectly aligned.
* [90/09/26 11:51:46 rwd]
- *
+ *
* Leave extra stack page around in case it is needed before we
* switch stacks.
* [90/09/25 rwd]
- *
+ *
* Revision 2.5 90/08/07 14:31:46 rpd
* Removed RCS keyword nonsense.
- *
+ *
* Revision 2.4 90/06/02 15:14:18 rpd
* Moved cthread_sp to machine-dependent files.
* [90/04/24 rpd]
* Converted to new IPC.
* [90/03/20 20:56:35 rpd]
- *
+ *
* Revision 2.3 90/01/19 14:37:34 rwd
* Move self pointer to top of stack
* [89/12/12 rwd]
- *
+ *
* Revision 2.2 89/12/08 19:49:52 rwd
* Back out change from af.
* [89/12/08 rwd]
- *
+ *
* Revision 2.1.1.3 89/12/06 12:54:17 rwd
* Gap fix from af
* [89/12/06 rwd]
- *
+ *
* Revision 2.1.1.2 89/11/21 15:01:40 rwd
* Add RED_ZONE ifdef.
* [89/11/20 rwd]
- *
+ *
* Revision 2.1.1.1 89/10/24 13:00:44 rwd
* Remove conditionals.
* [89/10/23 rwd]
- *
+ *
* Revision 2.1 89/08/03 17:10:05 rwd
* Created.
- *
+ *
* 18-Jan-89 David Golub (dbg) at Carnegie-Mellon University
* Altered for stand-alone use:
* use vm_region to probe for the bottom of the initial thread's
@@ -177,6 +180,7 @@ setup_stack(p, base)
*(cproc_t *)&ur_cthread_ptr(base) = p;
}
+#if 0 /* roland@gnu */
vm_offset_t
addr_range_check(start_addr, end_addr, desired_protection)
vm_offset_t start_addr, end_addr;
@@ -275,6 +279,7 @@ probe_stack(stack_bottom, stack_top)
*stack_bottom = last_start_addr;
*stack_top = last_end_addr;
}
+#endif
/* For GNU: */
unsigned long int __hurd_threadvar_stack_mask;
@@ -285,14 +290,17 @@ vm_offset_t
stack_init(p)
cproc_t p;
{
+#if 0
vm_offset_t stack_bottom,
stack_top,
start;
vm_size_t size;
kern_return_t r;
+#endif
void alloc_stack();
+#if 0
/*
* Probe for bottom and top of stack, as a power-of-2 size.
*/
@@ -304,6 +312,11 @@ stack_init(p)
*/
if (cthread_stack_size == 0)
cthread_stack_size = stack_top - stack_bottom;
+#else /* roland@gnu */
+ if (cthread_stack_size == 0)
+ cthread_stack_size = vm_page_size * 16; /* Reasonable default. */
+#endif
+
#ifdef STACK_GROWTH_UP
cthread_stack_mask = ~(cthread_stack_size - 1);
#else STACK_GROWTH_UP
@@ -332,6 +345,7 @@ stack_init(p)
*/
alloc_stack(p);
+#if 0
/*
* Delete rest of old stack.
*/
@@ -341,10 +355,11 @@ stack_init(p)
size = stack_top - start;
#else STACK_GROWTH_UP
start = stack_bottom;
- size = (cthread_sp() & ~(vm_page_size - 1)) - stack_bottom -
+ size = (cthread_sp() & ~(vm_page_size - 1)) - stack_bottom -
vm_page_size;
#endif STACK_GROWTH_UP
MACH_CALL(vm_deallocate(mach_task_self(),start,size),r);
+#endif
/*
* Return new stack; it gets passed back to the caller