From 148e12ed122d75506937cdc8ab2654f8449f2061 Mon Sep 17 00:00:00 2001 From: Ulrich Drepper Date: Wed, 9 Jan 2008 19:35:21 +0000 Subject: * sysdeps/unix/sysv/linux/i386/makecontext.S (__makecontext): Avoid clobbering memory at or above uc_stack.ss_sp + uc_stack.ss_size. * stdlib/Makefile: Add rules to build and run tst-makecontext2. * stdlib/tst-makecontext2.c: New test. --- sysdeps/unix/sysv/linux/i386/makecontext.S | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) (limited to 'sysdeps/unix/sysv/linux') diff --git a/sysdeps/unix/sysv/linux/i386/makecontext.S b/sysdeps/unix/sysv/linux/i386/makecontext.S index 89be1176f7..ad2340555a 100644 --- a/sysdeps/unix/sysv/linux/i386/makecontext.S +++ b/sysdeps/unix/sysv/linux/i386/makecontext.S @@ -1,5 +1,5 @@ /* Create new context. - Copyright (C) 2001, 2002, 2005 Free Software Foundation, Inc. + Copyright (C) 2001, 2002, 2005, 2007, 2008 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper , 2001. @@ -41,13 +41,15 @@ ENTRY(__makecontext) movl 12(%esp), %ecx movl %ecx, oEBX(%eax) - /* Make room on the new stack for the parameters. */ + /* Make room on the new stack for the parameters. + Room for the arguments, return address (== L(exitcode)) and + oLINK pointer is needed. One of the pointer sizes is subtracted + after aligning the stack. */ negl %ecx - leal -8(%edx,%ecx,4), %edx + leal -4(%edx,%ecx,4), %edx negl %ecx /* Align the stack. */ - addl $16, %edx andl $0xfffffff0, %edx subl $4, %edx -- cgit 1.4.1