39 lines
950 B
ArmAsm
39 lines
950 B
ArmAsm
#################################################################
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# #
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# Copyright 2007, 2013 Fidelity Information Services, Inc #
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# #
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# This source code contains the intellectual property #
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# of its copyright holder(s), and is made available #
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# under a license. If you do not know the terms of #
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# the license, please stop and do not read further. #
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# #
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#################################################################
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# PAGE ,132
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.title compswap.s
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.sbttl compswap
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.include "g_msf.si"
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.include "linkage.si"
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# .386
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# .MODEL FLAT, C
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.text
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ENTRY compswap
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# A(latch longword) Arg0
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# comparison value Arg1
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# replacement value Arg2
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# cmpxchg will compare REG32_RET0 i.e EAX with 1st arg so copy
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# comparison value to EAX
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movl REG32_ARG1,REG32_RET0
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lock
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cmpxchgl REG32_ARG2,(REG64_ARG0) # compare-n-swap
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jnz fail
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movl $1,REG32_RET0 # return TRUE
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ret
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fail:
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xor REG32_RET0,REG32_RET0 # return FALSE
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pause
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ret
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