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Add an ia64 atomic lock primitive for libc_r. This is mostly for

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completeness and doesn't get us a working libc_r there because libc_r
uses setjmp() and setjmp() cannot be used for context switches on ia64
as-is (or sparc64).  Rather than making setjmp/longjmp behave like
the *context() calls, it would be far better to make libc_r use *context()
directly which is what they are for.

Obtained from:  marcel
This commit is contained in:
Peter Wemm 2002-07-20 19:22:10 +00:00
parent 67b455bda4
commit 7657553c76
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=100409
2 changed files with 96 additions and 0 deletions
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48
lib/libc_r/arch/ia64/_atomic_lock.S Normal file
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@ -0,0 +1,48 @@
/*
* Copyright (c) 2002 Marcel Moolenaar
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*
* $FreeBSD$
*/
#if defined(LIBC_RCS) && !defined(lint)
.text
.asciz "$FreeBSD$"
#endif /* LIBC_RCS and not lint */
#include <machine/asm.h>
/*
* Atomicly lock a location with an identifier provided the location
* is not currently locked.
*
* long _atomic_lock(long *);
* eax will contain the return value (zero if lock obtained).
*/
ENTRY(_atomic_lock, 1)
add r14 = 1, r0
;;
xchg8 r8 = [r32], r14
br.ret.sptk rp
END(_atomic_lock)

48
lib/libpthread/arch/ia64/ia64/_atomic_lock.S Normal file
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/*
* Copyright (c) 2002 Marcel Moolenaar
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*
* $FreeBSD$
*/
#if defined(LIBC_RCS) && !defined(lint)
.text
.asciz "$FreeBSD$"
#endif /* LIBC_RCS and not lint */
#include <machine/asm.h>
/*
* Atomicly lock a location with an identifier provided the location
* is not currently locked.
*
* long _atomic_lock(long *);
* eax will contain the return value (zero if lock obtained).
*/
ENTRY(_atomic_lock, 1)
add r14 = 1, r0
;;
xchg8 r8 = [r32], r14
br.ret.sptk rp
END(_atomic_lock)