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fix some stack-pointer math in the previous revision.

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This commit is contained in:
chs 2004-07-20 01:51:49 +00:00
parent 1524f4361c
commit 6c4049f2ff
1 changed files with 7 additions and 6 deletions
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13
lib/libpthread/pthread_stack.c
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@ -1,4 +1,4 @@
/* $NetBSD: pthread_stack.c,v 1.13 2004/07/18 21:24:52 chs Exp $ */
/* $NetBSD: pthread_stack.c,v 1.14 2004/07/20 01:51:49 chs Exp $ */
/*-
* Copyright (c) 2001 The NetBSD Foundation, Inc.
@ -37,7 +37,7 @@
*/
#include <sys/cdefs.h>
__RCSID("$NetBSD: pthread_stack.c,v 1.13 2004/07/18 21:24:52 chs Exp $");
__RCSID("$NetBSD: pthread_stack.c,v 1.14 2004/07/20 01:51:49 chs Exp $");
#define __EXPOSE_STACK 1
#include <sys/param.h>
@ -160,6 +160,7 @@ pthread__stackid_setup(void *base, size_t size)
pthread_t t;
void *redaddr;
size_t pagesize;
caddr_t sp;
int ret;
t = base;
@ -171,18 +172,18 @@ pthread__stackid_setup(void *base, size_t size)
*/
redaddr = STACK_SHRINK(STACK_MAX(base, size), pagesize);
t->pt_stack.ss_size = PT_STACKSIZE - 2 * pagesize;
#ifdef __MACHINE_STACK_GROWS_UP
t->pt_stack.ss_sp = (char *)base + pagesize;
sp = t->pt_stack.ss_sp;
#else
t->pt_stack.ss_sp = (char *)base + 2 * pagesize;
sp = (caddr_t)t->pt_stack.ss_sp + t->pt_stack.ss_size;
#endif
t->pt_stack.ss_size = PT_STACKSIZE - 2 * pagesize;
/* Set up an initial ucontext pointer to a "safe" area */
t->pt_uc = (ucontext_t *)
STACK_ALIGN(STACK_GROW(t->pt_stack.ss_sp, pagesize / 2),
~_UC_UCONTEXT_ALIGN);
STACK_ALIGN(STACK_GROW(sp, pagesize / 2), ~_UC_UCONTEXT_ALIGN);
/* Protect the next-to-bottom stack page as a red zone. */
ret = mprotect(redaddr, pagesize, PROT_NONE);