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Fixed flag setting for ADC, SBB, SAR and IMUL instructions.

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This commit is contained in:
BITDEFENDER\vlutas 2022-07-14 13:42:37 +03:00
parent e930d49713
commit 1805a9edec
4 changed files with 33 additions and 22 deletions
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51
bdshemu/bdshemu.c
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@ -422,8 +422,9 @@ ShemuSetFlags(
}
else if (FM_SAR == FlagsMode)
{
// CF is the last bit shifted out of the destination.
if (ND_GET_BIT(Src2 - 1, Src1))
// CF is the last bit shifted out of the destination. In case of SAR, if the shift ammount exceeds the operand
// size, CF will be 1 if the result is -1, or 0 if the result is 0.
if (ND_GET_BIT(Src2 - 1, Src1) || ((Src2 >= (ND_UINT64)Size * 8) && Dst != 0))
{
Context->Registers.RegFlags |= NDR_RFLAG_CF;
}
@ -437,11 +438,11 @@ ShemuSetFlags(
else
{
// Set CF.
if ((FM_SUB == FlagsMode) && (Src1 < Src2))
if ((FM_SUB == FlagsMode) && ((Src1 < Src2) || (Src1 == Src2 && Dst != 0)))
{
Context->Registers.RegFlags |= NDR_RFLAG_CF;
}
else if ((FM_ADD == FlagsMode) && (Dst < Src1))
else if ((FM_ADD == FlagsMode) && ((Dst < Src1) || (Dst == Src1 && Src2 != 0)))
{
Context->Registers.RegFlags |= NDR_RFLAG_CF;
}
@ -1107,7 +1108,7 @@ ShemuSetMemValue(
//
// IntWinShcSetOperandValue
// ShemuGetOperandValue
//
static SHEMU_STATUS
ShemuGetOperandValue(
@ -1293,7 +1294,7 @@ done_gla:;
//
// IntWinShcSetOperandValue
// ShemuSetOperandValue
//
static SHEMU_STATUS
ShemuSetOperandValue(
@ -1945,14 +1946,14 @@ ShemuEmulate(
GET_OP(Context, 0, &dst);
GET_OP(Context, 1, &src);
if (ND_INS_ADC == Context->Instruction.Instruction)
{
src.Value.Qwords[0] += GET_FLAG(Context, NDR_RFLAG_CF);
}
res.Size = src.Size;
res.Value.Qwords[0] = dst.Value.Qwords[0] + src.Value.Qwords[0];
if (ND_INS_ADC == Context->Instruction.Instruction)
{
res.Value.Qwords[0] += GET_FLAG(Context, NDR_RFLAG_CF);
}
SET_FLAGS(Context, res, dst, src, FM_ADD);
SET_OP(Context, 0, &res);
@ -1964,14 +1965,14 @@ ShemuEmulate(
GET_OP(Context, 0, &dst);
GET_OP(Context, 1, &src);
if (ND_INS_SBB == Context->Instruction.Instruction)
{
src.Value.Qwords[0] += GET_FLAG(Context, NDR_RFLAG_CF);
}
res.Size = src.Size;
res.Value.Qwords[0] = dst.Value.Qwords[0] - src.Value.Qwords[0];
if (ND_INS_SBB == Context->Instruction.Instruction)
{
res.Value.Qwords[0] -= GET_FLAG(Context, NDR_RFLAG_CF);
}
SET_FLAGS(Context, res, dst, src, FM_SUB);
if (ND_INS_CMP != Context->Instruction.Instruction)
@ -2521,20 +2522,29 @@ check_far_branch:
case ND_INS_MUL:
case ND_INS_IMUL:
if (Context->Instruction.ExpOperandsCount < 3)
if (Context->Instruction.ExpOperandsCount == 1)
{
// MUL or IMUL with a single explicit operand or IMUL with 2 explicit operands.
// MUL or IMUL with a single explicit operand.
GET_OP(Context, 0, &dst);
GET_OP(Context, 1, &src);
res.Size = dst.Size * 2;
}
else if (Context->Instruction.ExpOperandsCount == 2)
{
// IMUL with 2 explicit operands.
GET_OP(Context, 0, &dst);
GET_OP(Context, 1, &src);
res.Size = dst.Size;
}
else
{
// IMUL with 3 operands. The first operand is the write-only destination.
GET_OP(Context, 0, &res);
GET_OP(Context, 1, &dst);
GET_OP(Context, 2, &src);
res.Size = dst.Size;
}
if (dst.Size == 1)
{
if (ND_INS_MUL == Context->Instruction.Instruction)
@ -2610,6 +2620,7 @@ check_far_branch:
SET_OP(Context, 0, &res);
}
// Set the flags.
if (ND_INS_MUL == Context->Instruction.Instruction)
{
ND_UINT8 cfof = 0;
@ -2640,7 +2651,7 @@ check_far_branch:
// the sign extended operand - size - truncated product, otherwise the CF and OF flags are cleared.
ND_UINT8 cfof = 0, sign = 0;
sign = ND_MSB(res.Size, res.Value.Qwords[0]);
sign = ND_MSB(dst.Size, res.Value.Qwords[0]);
switch (dst.Size)
{

BIN
bdshemu_test/bdshemu_test.zip
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2
bindings/pybddisasm/setup.py
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@ -12,7 +12,7 @@ from setuptools import find_packages, setup, Command, Extension, Distribution
from codecs import open
VERSION = (0, 1, 3)
LIBRARY_VERSION = (1, 34, 10)
LIBRARY_VERSION = (1, 34, 15)
LIBRARY_INSTRUX_SIZE = 856
packages = ['pybddisasm']

2
inc/version.h
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@ -7,6 +7,6 @@
#define DISASM_VERSION_MAJOR 1
#define DISASM_VERSION_MINOR 34
#define DISASM_VERSION_REVISION 10
#define DISASM_VERSION_REVISION 15
#endif // DISASM_VER_H