diff options
Diffstat (limited to 'libthreads')
| -rw-r--r-- | libthreads/stack.c | 65 |
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 |