89 lines
2.0 KiB
NASM
89 lines
2.0 KiB
NASM
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; Copyright (c) 1989 Microsoft Corporation
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;
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; Module Name:
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;
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; kdstr.asm
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;
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; Abstract:
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;
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; Author:
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;
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; Environment:
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;
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; Revision History:
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;
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;--
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.386p
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include mac386.inc
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include callconv.inc ; calling convention macros
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_TEXT SEGMENT DWORD PUBLIC 'CODE'
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ASSUME DS:FLAT, ES:FLAT, SS:NOTHING, FS:NOTHING, GS:NOTHING
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;++
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;
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; PUCHAR
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; KdpCopyDataToStack(
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; IN PUCHAR Data,
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; IN ULONG Length
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; )
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;
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; Routine Description:
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;
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; This routine moves the specified amount of data bytes onto the callers
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; stack. The callers ESP is adjust to account for the storage.
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;
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; Arguments:
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;
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; (esp) - return address
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;
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; Data (esp+4) - supplies point to the string to copy
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;
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; Length (esp+8) - Length of data to copy
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;
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; MaximumLength (esp+
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;
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; Return Value:
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;
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; Pointer to copied data
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;
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;--
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cPublicProc _KdpCopyDataToStack ,2
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pop eax ; (eax) = return address
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pop edx ; (edx) = data pointer
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pop ecx ; (ecx) = length
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sub esp, ecx ; make space on callers stack
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sub esp, 4
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and esp, not 3 ; round stack to a DWORD boundry
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push ecx ; restore parameters onto new stack location
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push edx
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push eax
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push edi
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push esi ; save C registers
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mov esi, edx ; (esi) = source
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mov eax, esp
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add eax, 5*4 ; adjust for local stack
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mov edi, eax ; (edi) = dest stack address
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mov edx, ecx ; (edx) = number of bytes
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shr ecx, 2 ; # of dwords
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rep movsd ; move dwords
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mov ecx, edx
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and ecx, 3 ; # of remaining bytes
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rep movsb ; move bytes
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pop esi
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pop edi ; restore C registers
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stdRET _KdpCopyDataToStack ; (eax) = dest stack address
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stdENDP _KdpCopyDataToStack
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_TEXT ends
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end
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