bd6060a1c6
are aliases for the syscall stubs and are plt-interposed, to the libc-private aliases of internally interposed sigprocmask() etc. Since e.g. _sigaction is not interposed by libthr, calling signal() removes thr_sighandler() from the handler slot etc. The result was breaking signal semantic and rtld locking. The added __libc_sigprocmask and other symbols are hidden, they are not exported and cannot be called through PLT. The setjmp/longjmp functions for x86 were changed to use direct calls, and since PIC_PROLOGUE only needed for functional PLT indirection on i386, it is removed as well. The PowerPC bug of calling the syscall directly in the setjmp/longjmp implementation is kept as is. Reported by: Pete French <petefrench@ingresso.co.uk> Tested by: Michiel Boland <boland37@xs4all.nl> Reviewed by: jilles (previous version) Sponsored by: The FreeBSD Foundation MFC after: 1 week
109 lines
3.3 KiB
ArmAsm
109 lines
3.3 KiB
ArmAsm
/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* William Jolitz.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)setjmp.s 5.1 (Berkeley) 4/23/90"
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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.text
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.asciz "$Id: sigsetjmp.S,v 1.1 1993/12/05 13:01:05 ats Exp $"
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#endif /* LIBC_SCCS and not lint */
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#include <machine/asm.h>
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__FBSDID("$FreeBSD$");
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#include "SYS.h"
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/*-
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* TODO:
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* Rename sigsetjmp to __sigsetjmp and siglongjmp to __siglongjmp,
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* remove the other *jmp functions and define everything in terms
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* of the renamed functions. This requires compiler support for
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* the renamed functions (introduced in gcc-2.5.3; previous versions
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* only supported *jmp with 0 or 1 leading underscores).
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*
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* Restore _all_ the registers and the signal mask atomically. Can
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* use sigreturn() if sigreturn() works.
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*/
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ENTRY(sigsetjmp)
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movl 8(%esp),%eax
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movl 4(%esp),%ecx
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movl %eax,44(%ecx)
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testl %eax,%eax
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jz 2f
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leal 28(%ecx), %eax
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pushl %eax /* (sigset_t*)oset */
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pushl $0 /* (sigset_t*)set */
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pushl $1 /* SIG_BLOCK */
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call __libc_sigprocmask
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addl $12,%esp
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movl 4(%esp),%ecx
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2: movl 0(%esp),%edx
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movl %edx, 0(%ecx)
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movl %ebx, 4(%ecx)
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movl %esp, 8(%ecx)
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movl %ebp,12(%ecx)
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movl %esi,16(%ecx)
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movl %edi,20(%ecx)
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fnstcw 24(%ecx)
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xorl %eax,%eax
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ret
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END(sigsetjmp)
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WEAK_REFERENCE(__siglongjmp, siglongjmp)
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ENTRY(__siglongjmp)
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movl 4(%esp),%edx
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cmpl $0,44(%edx)
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jz 2f
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pushl $0 /* (sigset_t*)oset */
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leal 28(%edx), %eax
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pushl %eax /* (sigset_t*)set */
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pushl $3 /* SIG_SETMASK */
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call __libc_sigprocmask
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addl $12,%esp
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movl 4(%esp),%edx
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2: movl 8(%esp),%eax
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movl 0(%edx),%ecx
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movl 4(%edx),%ebx
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movl 8(%edx),%esp
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movl 12(%edx),%ebp
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movl 16(%edx),%esi
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movl 20(%edx),%edi
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fldcw 24(%edx)
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testl %eax,%eax
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jnz 1f
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incl %eax
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1: movl %ecx,0(%esp)
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ret
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END(__siglongjmp)
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.section .note.GNU-stack,"",%progbits
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