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55 lines
1.3 KiB
ArmAsm
55 lines
1.3 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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* Timo Kreuzer (timo.kreuzer@reactos.org)
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*/
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#include <asm.inc>
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PUBLIC @RtlUshortByteSwap@4
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PUBLIC @RtlUlongByteSwap@4
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PUBLIC @RtlUlonglongByteSwap@8
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/* FUNCTIONS ***************************************************************/
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.code
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FUNC @RtlUshortByteSwap@4
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FPO 0, 0, 0, 0, 0, FRAME_FPO
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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
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FPO 0, 0, 0, 0, 0, FRAME_FPO
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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
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FPO 0, 2, 0, 0, 0, FRAME_FPO
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/* Get 64-bit integer */
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mov eax, [esp+8]
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mov edx, [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 (NOTE: this might look wrong, since fastcall functions
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should clean up the stack, even if the first parameter is an ULONGLONG,
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and therefore put on tthe stack instead of in ecx and edx,
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but thats exactly how the function behaves on Windows! */
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ret
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ENDFUNC
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END
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