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[SOFT386]

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Implement the CLC, STC, CLI, STI, CLD and STD instructions.


svn path=/branches/ntvdm/; revision=59876
This commit is contained in:
Aleksandar Andrejevic 2013-08-29 17:48:32 +00:00
parent 1143eab8a5
commit 5a14da958f
2 changed files with 168 additions and 6 deletions
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126
lib/soft386/opcodes.c
View file

@ -272,12 +272,12 @@ Soft386OpcodeHandlers[SOFT386_NUM_OPCODE_HANDLERS] =
NULL, // TODO: OPCODE 0xF5 NOT SUPPORTED NULL, // TODO: OPCODE 0xF5 NOT SUPPORTED
NULL, // TODO: OPCODE 0xF6 NOT SUPPORTED NULL, // TODO: OPCODE 0xF6 NOT SUPPORTED
NULL, // TODO: OPCODE 0xF7 NOT SUPPORTED NULL, // TODO: OPCODE 0xF7 NOT SUPPORTED
NULL, // TODO: OPCODE 0xF8 NOT SUPPORTED Soft386OpcodeClearCarry,
NULL, // TODO: OPCODE 0xF9 NOT SUPPORTED Soft386OpcodeSetCarry,
NULL, // TODO: OPCODE 0xFA NOT SUPPORTED Soft386OpcodeClearInt,
NULL, // TODO: OPCODE 0xFB NOT SUPPORTED Soft386OpcodeSetInt,
NULL, // TODO: OPCODE 0xFC NOT SUPPORTED Soft386OpcodeClearDir,
NULL, // TODO: OPCODE 0xFD NOT SUPPORTED Soft386OpcodeSetDir,
NULL, // TODO: OPCODE 0xFE NOT SUPPORTED NULL, // TODO: OPCODE 0xFE NOT SUPPORTED
NULL, // TODO: OPCODE 0xFF NOT SUPPORTED NULL, // TODO: OPCODE 0xFF NOT SUPPORTED
}; };
@ -740,3 +740,117 @@ Soft386OpcodeShortConditionalJmp(PSOFT386_STATE State, UCHAR Opcode)
/* Return success */ /* Return success */
return TRUE; return TRUE;
} }
BOOLEAN
FASTCALL
Soft386OpcodeClearCarry(PSOFT386_STATE State, UCHAR Opcode)
{
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xF8);
/* Clear CF and return success */
State->Flags.Cf = FALSE;
return TRUE;
}
BOOLEAN
FASTCALL
Soft386OpcodeSetCarry(PSOFT386_STATE State, UCHAR Opcode)
{
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xF9);
/* Set CF and return success*/
State->Flags.Cf = TRUE;
return TRUE;
}
BOOLEAN
FASTCALL
Soft386OpcodeClearInt(PSOFT386_STATE State, UCHAR Opcode)
{
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xFA);
/* Check for protected mode */
if (State->ControlRegisters[SOFT386_REG_CR0] & SOFT386_CR0_PE)
{
/* Check IOPL */
if (State->Flags.Iopl >= State->SegmentRegs[SOFT386_REG_CS].Dpl)
{
/* Clear the interrupt flag */
State->Flags.If = FALSE;
}
else
{
/* General Protection Fault */
Soft386Exception(State, SOFT386_EXCEPTION_GP);
return FALSE;
}
}
else
{
/* Just clear the interrupt flag */
State->Flags.If = FALSE;
}
/* Return success */
return TRUE;
}
BOOLEAN
FASTCALL
Soft386OpcodeSetInt(PSOFT386_STATE State, UCHAR Opcode)
{
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xFB);
/* Check for protected mode */
if (State->ControlRegisters[SOFT386_REG_CR0] & SOFT386_CR0_PE)
{
/* Check IOPL */
if (State->Flags.Iopl >= State->SegmentRegs[SOFT386_REG_CS].Dpl)
{
/* Set the interrupt flag */
State->Flags.If = TRUE;
}
else
{
/* General Protection Fault */
Soft386Exception(State, SOFT386_EXCEPTION_GP);
return FALSE;
}
}
else
{
/* Just set the interrupt flag */
State->Flags.If = TRUE;
}
/* Return success */
return TRUE;
}
BOOLEAN
FASTCALL
Soft386OpcodeClearDir(PSOFT386_STATE State, UCHAR Opcode)
{
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xFC);
/* Clear DF and return success */
State->Flags.Df = FALSE;
return TRUE;
}
BOOLEAN
FASTCALL
Soft386OpcodeSetDir(PSOFT386_STATE State, UCHAR Opcode)
{
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xFD);
/* Set DF and return success*/
State->Flags.Df = TRUE;
return TRUE;
}

48
lib/soft386/opcodes.h
View file

@ -87,4 +87,52 @@ Soft386OpcodeShortConditionalJmp
UCHAR Opcode UCHAR Opcode
); );
BOOLEAN
FASTCALL
Soft386OpcodeClearCarry
(
PSOFT386_STATE State,
UCHAR Opcode
);
BOOLEAN
FASTCALL
Soft386OpcodeSetCarry
(
PSOFT386_STATE State,
UCHAR Opcode
);
BOOLEAN
FASTCALL
Soft386OpcodeClearInt
(
PSOFT386_STATE State,
UCHAR Opcode
);
BOOLEAN
FASTCALL
Soft386OpcodeSetInt
(
PSOFT386_STATE State,
UCHAR Opcode
);
BOOLEAN
FASTCALL
Soft386OpcodeClearDir
(
PSOFT386_STATE State,
UCHAR Opcode
);
BOOLEAN
FASTCALL
Soft386OpcodeSetDir
(
PSOFT386_STATE State,
UCHAR Opcode
);
#endif // _OPCODES_H_ #endif // _OPCODES_H_