1a015b5644
rwlocks are now out of line, so it near never triggers. Also it was incompatible with the new dwarf2 unwinder because it had unannotiatable push/pops. Signed-off-by: Andi Kleen <ak@suse.de>
38 lines
1007 B
C
38 lines
1007 B
C
/* include/asm-i386/rwlock.h
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*
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* Helpers used by both rw spinlocks and rw semaphores.
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*
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* Based in part on code from semaphore.h and
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* spinlock.h Copyright 1996 Linus Torvalds.
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*
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* Copyright 1999 Red Hat, Inc.
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*
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* Written by Benjamin LaHaise.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _ASM_I386_RWLOCK_H
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#define _ASM_I386_RWLOCK_H
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#define RW_LOCK_BIAS 0x01000000
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#define RW_LOCK_BIAS_STR "0x01000000"
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#define __build_read_lock(rw, helper) \
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asm volatile(LOCK_PREFIX " subl $1,(%0)\n\t" \
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"jns 1f\n" \
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"call " helper "\n\t" \
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"1:\n" \
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::"a" (rw) : "memory")
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#define __build_write_lock(rw, helper) \
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asm volatile(LOCK_PREFIX " subl $" RW_LOCK_BIAS_STR ",(%0)\n\t" \
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"jz 1f\n" \
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"call " helper "\n\t" \
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"1:\n" \
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::"a" (rw) : "memory")
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#endif
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