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53 lines
1 KiB
ArmAsm
53 lines
1 KiB
ArmAsm
/*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS Run-Time Library
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* PURPOSE: Byte swap functions
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* FILE: lib/rtl/i386/rtlswap.S
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* PROGRAMER: Alex Ionescu (alex.ionescu@reactos.org)
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*/
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.intel_syntax noprefix
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.globl @RtlUshortByteSwap@4
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.globl @RtlUlongByteSwap@4
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.globl @RtlUlonglongByteSwap@8
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/* FUNCTIONS ***************************************************************/
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.func @RtlUshortByteSwap@4, @RtlUshortByteSwap@4
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@RtlUshortByteSwap@4:
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/* Swap high and low bits */
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mov ah, cl
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mov al, ch
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ret
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.endfunc
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.func @RtlUlongByteSwap@4, @RtlUlongByteSwap@4
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@RtlUlongByteSwap@4:
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/* Swap high and low bits */
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mov eax, ecx
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bswap eax
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ret
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.endfunc
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.func @RtlUlonglongByteSwap@8, @RtlUlonglongByteSwap@8
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@RtlUlonglongByteSwap@8:
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/* Get 64-bit integer */
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mov edx, [esp+8]
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mov eax, [esp+4]
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/* Swap it */
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bswap edx
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bswap eax
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/* Return it */
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mov ecx, eax
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mov eax, edx
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mov edx, ecx
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ret
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.endfunc
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