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133 lines
2.2 KiB
133 lines
2.2 KiB
/*++
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Copyright (c) 1994 Microsoft Corporation
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Module Name:
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setops.c
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Abstract:
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This module implements the code to emulate set opcodes.
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Author:
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David N. Cutler (davec) 13-Sep-1994
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Environment:
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Kernel mode only.
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Revision History:
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--*/
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#include "nthal.h"
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#include "emulate.h"
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VOID
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XmSxxOp (
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IN PRXM_CONTEXT P
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)
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/*++
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Routine Description:
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This function emulates set byte on condition opcodes.
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Arguments:
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P - Supplies a pointer to the emulation context structure.
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Return Value:
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None.
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--*/
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{
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ULONG Complement;
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ULONG Condition;
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//
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// Case on the set control value.
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//
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Complement = P->SrcValue.Long & 1;
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switch (P->SrcValue.Long >> 1) {
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//
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// Set if overflow/not overflow.
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//
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case 0:
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Condition = P->Eflags.EFLAG_OF;
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break;
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//
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// Set if below/not below.
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//
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case 1:
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Condition = P->Eflags.EFLAG_CF;
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break;
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//
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// Set if zero/not zero.
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//
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case 2:
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Condition = P->Eflags.EFLAG_ZF;
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break;
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//
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// Set if below or equal/not below or equal.
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//
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case 3:
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Condition = P->Eflags.EFLAG_CF | P->Eflags.EFLAG_ZF;
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break;
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//
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// Set if signed/not signed.
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//
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case 4:
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Condition = P->Eflags.EFLAG_SF;
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break;
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//
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// Set if parity/not parity.
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//
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case 5:
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Condition = P->Eflags.EFLAG_PF;
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break;
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//
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// Set if less/not less.
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//
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case 6:
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Condition = (P->Eflags.EFLAG_SF ^ P->Eflags.EFLAG_OF);
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break;
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//
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// Set if less or equal/not less or equal.
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//
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case 7:
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Condition = (P->Eflags.EFLAG_SF ^ P->Eflags.EFLAG_OF) | P->Eflags.EFLAG_ZF;
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break;
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}
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//
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// If the specified condition is met, then set the byte destination
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// value to one. Otherwise, set the byte destination value to zero.
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//
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XmStoreResult(P, (ULONG)(Condition ^ Complement));
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return;
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}
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