freebsd-dev/lib/libc/i386/sys/sigprocmask.S
Peter Wemm f1703dfbaa Add support to enable libc to be compiled in ELF format. (#ifdef __ELF__)
In a nutshell, this macroizes the local/global symbol scoping rules
that are different in a.out and ELF.  It also makes the i386 assembler
stubs conform to i386 PIC calling conventions - the a.out ld.so didn't
object, but the ELF one needs it as it implements PIC jumps via PLT's as
well as calls.  The a.out rtld only worked because it was accidently
snooping the grandparent calling function's return address off the stack..

This also affects the libc_r code a little, because of cpp macro nesting.
1996-05-05 07:56:21 +00:00

73 lines
2.7 KiB
ArmAsm

/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: sigprocmask.S,v 1.3 1996/01/22 00:00:59 julian Exp $
*/
#if defined(SYSLIBC_RCS) && !defined(lint)
.text
.asciz "$Id: sigprocmask.S,v 1.3 1996/01/22 00:00:59 julian Exp $"
#endif /* SYSLIBC_RCS and not lint */
#include "SYS.h"
err:
PIC_PROLOGUE
jmp PIC_PLT(HIDENAME(cerror))
#ifdef _THREAD_SAFE
ENTRY(_thread_sys_sigprocmask)
#else
ENTRY(sigprocmask)
#endif
movl 8(%esp),%ecx # fetch new sigset pointer
cmpl $0,%ecx # check new sigset pointer
jne 1f # if not null, indirect
/* movl $0,8(%esp) # null mask pointer: block empty set */
movl $1,4(%esp) # SIG_BLOCK
jmp 2f
1: movl (%ecx),%ecx # fetch indirect ...
movl %ecx,8(%esp) # to new mask arg
2: lea SYS_sigprocmask,%eax
KERNCALL
jb err
movl 12(%esp),%ecx # fetch old mask requested
cmpl $0,%ecx # test if old mask requested
je out
movl %eax,(%ecx) # store old mask
out:
xorl %eax,%eax
ret