diff options
Diffstat (limited to 'libthreads')
| -rw-r--r-- | libthreads/stack.c | 102 |
1 files changed, 36 insertions, 66 deletions
diff --git a/libthreads/stack.c b/libthreads/stack.c index 0115e6c3..dd2ba9bd 100644 --- a/libthreads/stack.c +++ b/libthreads/stack.c @@ -1,6 +1,6 @@ /* * Mach Operating System - * Copyright (c) 1991,1990 Carnegie Mellon University + * Copyright (c) 1992,1991,1990 Carnegie Mellon University * All Rights Reserved. * * Permission to use, copy, modify and distribute this software and its @@ -25,19 +25,12 @@ */ /* * HISTORY - * $Log: stack.c,v $ - * Revision 1.6 1997/02/20 04:30:35 miles - * (__hurd_threadvar_stack_mask, __hurd_threadvar_stack_offset, - * __hurd_threadvar_max): - * Make extern. - * - * Revision 1.5 1995/12/10 13:41:30 roland - * (addr_range_check, probe_stack): Functions #if 0'd out. - * (stack_init): Don't call probe_stack or frob old stack at all. - * Default cthread_stack_size to 16 pages if it is zero. - * - * Revision 1.4 1994/05/05 16:00:09 roland - * entered into RCS + * $Log: stack.c,v $ + * Revision 2.14 93/01/14 18:05:58 danner + * Converted file to ANSI C. + * [92/12/18 pds] + * 64bit cleanup. + * [92/12/02 af] * * Revision 2.13 92/01/14 16:48:54 rpd * Fixed addr_range_check to deallocate the object port from vm_region. @@ -136,12 +129,10 @@ #define BYTES_TO_PAGES(b) (((b) + vm_page_size - 1) / vm_page_size) -int cthread_stack_mask; +vm_offset_t cthread_stack_mask; vm_size_t cthread_stack_size; private vm_address_t next_stack_base; -vm_offset_t cproc_stack_base(); /* forward */ - /* * Set up a stack segment for a thread. * Segment has a red zone (invalid page) @@ -171,7 +162,9 @@ setup_stack(p, base) register cproc_t p; register vm_address_t base; { +#if defined(RED_ZONE) register kern_return_t r; +#endif /* defined(RED_ZONE) */ p->stack_base = base; /* @@ -181,20 +174,19 @@ setup_stack(p, base) /* * Protect red zone. */ -#ifdef RED_ZONE +#if defined(RED_ZONE) MACH_CALL(vm_protect(mach_task_self(), base + vm_page_size, vm_page_size, FALSE, VM_PROT_NONE), r); -#endif /* RED_ZONE */ +#endif /* defined(RED_ZONE) */ /* * Store self pointer. */ *(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; - vm_prot_t desired_protection; +#if 0 /* GNU */ +private vm_offset_t +addr_range_check(vm_offset_t start_addr, vm_offset_t end_addr, + vm_prot_t desired_protection) { register vm_offset_t addr; @@ -232,10 +224,8 @@ addr_range_check(start_addr, end_addr, desired_protection) * 1. stack grows DOWN * 2. There is an unallocated region below the stack. */ -void -probe_stack(stack_bottom, stack_top) - vm_offset_t *stack_bottom; - vm_offset_t *stack_top; +private void +probe_stack(vm_offset_t *stack_bottom, vm_offset_t *stack_top) { /* * Since vm_region returns the region starting at @@ -280,9 +270,8 @@ probe_stack(stack_bottom, stack_top) /* * Check that the entire range exists and is writable */ - } while (end_addr = (addr_range_check(start_addr, - end_addr, - VM_PROT_READ|VM_PROT_WRITE))); + } while ((end_addr = addr_range_check(start_addr, end_addr, + VM_PROT_READ|VM_PROT_WRITE))); /* * Back off to previous power of 2. */ @@ -297,8 +286,7 @@ extern unsigned long int __hurd_threadvar_stack_offset; extern unsigned int __hurd_threadvar_max; vm_offset_t -stack_init(p) - cproc_t p; +stack_init(cproc_t p) { #if 0 vm_offset_t stack_bottom, @@ -306,11 +294,7 @@ stack_init(p) 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. */ @@ -322,28 +306,16 @@ stack_init(p) */ if (cthread_stack_size == 0) cthread_stack_size = stack_top - stack_bottom; -#else /* roland@gnu */ +#else /* GNU */ if (cthread_stack_size == 0) cthread_stack_size = vm_page_size * 16; /* Reasonable default. */ -#endif +#endif /* GNU */ -#ifdef STACK_GROWTH_UP +#if defined(STACK_GROWTH_UP) cthread_stack_mask = ~(cthread_stack_size - 1); -#else /* STACK_GROWTH_UP */ +#else /* not defined(STACK_GROWTH_UP) */ cthread_stack_mask = cthread_stack_size - 1; -#endif /* STACK_GROWTH_UP */ - - /* Set up the variables so GNU can find its per-thread variables. */ - __hurd_threadvar_stack_mask = ~(cthread_stack_size - 1); - /* The GNU per-thread variables will be stored just after the - cthread-self pointer at the base of the stack. */ -#ifdef STACK_GROWTH_UP - __hurd_threadvar_stack_offset = sizeof (ur_cthread_t *); -#else - __hurd_threadvar_stack_offset = (cthread_stack_size - - sizeof (ur_cthread_t *) - - __hurd_threadvar_max * sizeof (long)); -#endif +#endif /* defined(STACK_GROWTH_UP) */ /* * Guess at first available region for stack. @@ -355,28 +327,27 @@ stack_init(p) */ alloc_stack(p); -#if 0 +#if 0 /* GNU */ /* * Delete rest of old stack. */ -#ifdef STACK_GROWTH_UP +#if defined(STACK_GROWTH_UP) start = (cthread_sp() | (vm_page_size - 1)) + 1 + vm_page_size; size = stack_top - start; -#else /* STACK_GROWTH_UP */ +#else /* not defined(STACK_GROWTH_UP) */ start = stack_bottom; size = (cthread_sp() & ~(vm_page_size - 1)) - stack_bottom - vm_page_size; -#endif /* STACK_GROWTH_UP */ +#endif /* defined(STACK_GROWTH_UP) */ MACH_CALL(vm_deallocate(mach_task_self(),start,size),r); -#endif +#endif /* GNU */ /* * Return new stack; it gets passed back to the caller * of cthread_init who must switch to it. */ - return cproc_stack_base(p, - sizeof(ur_cthread_t *) + + return cproc_stack_base(p, sizeof(ur_cthread_t *) + /* Account for GNU per-thread variables. */ __hurd_threadvar_max * sizeof (long int)); } @@ -392,8 +363,7 @@ stack_init(p) */ void -alloc_stack(p) - cproc_t p; +alloc_stack(cproc_t p) { vm_address_t base = next_stack_base; @@ -410,11 +380,11 @@ cproc_stack_base(cproc, offset) register cproc_t cproc; register int offset; { -#ifdef STACK_GROWTH_UP +#if defined(STACK_GROWTH_UP) return (cproc->stack_base + offset); -#else /* STACK_GROWTH_UP */ +#else /* not defined(STACK_GROWTH_UP) */ return (cproc->stack_base + cproc->stack_size - offset); -#endif /* STACK_GROWTH_UP */ +#endif /* defined(STACK_GROWTH_UP) */ } |