112 lines
2 KiB
NASM
112 lines
2 KiB
NASM
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?PLM=1 ; PASCAL Calling convention is DEFAULT
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?WIN=0 ; Windows calling convention
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PMODE=1
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.xlist
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include cmacros.inc
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include windows.inc
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.list
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externA __WinFlags ; in KERNEL
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externA __AHINCR ; in KERNEL
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externA __AHSHIFT ; in KERNEL
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; The following structure should be used to access high and low
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; words of a DWORD. This means that "word ptr foo[2]" -> "foo.hi".
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LONG struc
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lo dw ?
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hi dw ?
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LONG ends
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FARPOINTER struc
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off dw ?
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sel dw ?
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FARPOINTER ends
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; Manually perform "push" dword register instruction to remove warning
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PUSHD macro reg
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db 66h
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push reg
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endm
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; Manually perform "pop" dword register instruction to remove warning
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POPD macro reg
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db 66h
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pop reg
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endm
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; -------------------------------------------------------
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; DATA SEGMENT DECLARATIONS
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; -------------------------------------------------------
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ifndef SEGNAME
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SEGNAME equ <_TEXT>
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endif
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createSeg %SEGNAME, CodeSeg, word, public, CODE
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sBegin Data
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sEnd Data
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sBegin CodeSeg
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assumes cs,CodeSeg
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assumes ds,DATA
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;---------------------------Public-Routine------------------------------;
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; MemCopy
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;
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; copy memory
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;
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; Entry:
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; lpSrc HPSTR to copy from
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; lpDst HPSTR to copy to
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; cbMem DWORD count of bytes to move
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;
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; Returns:
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; destination pointer
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; Error Returns:
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; None
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; Registers Preserved:
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; BP,DS,SI,DI
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; Registers Destroyed:
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; AX,BX,CX,DX,FLAGS
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; Calls:
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; nothing
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;-----------------------------------------------------------------------;
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cProc MemCopy,<NEAR,PASCAL,PUBLIC>,<ds>
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ParmD lpDst
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ParmD lpSrc
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ParmD cbMem
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cBegin
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.386
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PUSHD di ; push edi
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PUSHD si ; push esi
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cld
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mov ecx,cbMem
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jecxz mc386_exit
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movzx edi,di
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movzx esi,si
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lds si,lpSrc
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les di,lpDst
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mov ebx,ecx
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shr ecx,2 ; get count in DWORDs
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rep movs dword ptr es:[edi], dword ptr ds:[esi]
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mov ecx,ebx
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and ecx,3
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rep movs byte ptr es:[edi], byte ptr ds:[esi]
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mc386_exit:
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cld
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POPD si : pop esi
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POPD di ; pop edi
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.286
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cEnd
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sEnd CodeSeg
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end
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