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[FAST486]

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- Control register 0 is CR0: use FAST486_REG_CR0 instead of 0, as it is done in the rest of the code.
- Improve a if/else if control.
- Don't halt the processor in the middle of prefixes processing.

svn path=/trunk/; revision=64851
This commit is contained in:
Hermès Bélusca-Maïto 2014-10-20 19:42:52 +00:00
parent e46ceff760
commit 705dcd2d05
5 changed files with 6 additions and 14 deletions
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4
reactos/lib/fast486/common.c
View file

@ -55,7 +55,7 @@ Fast486ReadMemory(PFAST486_STATE State,
}
/* Check for protected mode */
if (State->ControlRegisters[0] & FAST486_CR0_PE)
if (State->ControlRegisters[FAST486_REG_CR0] & FAST486_CR0_PE)
{
/* Privilege checks */
@ -122,7 +122,7 @@ Fast486WriteMemory(PFAST486_STATE State,
}
/* Check for protected mode */
if (State->ControlRegisters[0] & FAST486_CR0_PE)
if (State->ControlRegisters[FAST486_REG_CR0] & FAST486_CR0_PE)
{
/* Privilege checks */

9
reactos/lib/fast486/common.inl
View file

@ -762,7 +762,7 @@ Fast486ParseModRegRm(PFAST486_STATE State,
ModRegRm->Register = (ModRmByte >> 3) & 0x07;
/* Check the mode */
if ((ModRmByte >> 6) == 3)
if (Mode == 3)
{
/* The second operand is also a register */
ModRegRm->Memory = FALSE;
@ -886,7 +886,6 @@ Fast486ParseModRegRm(PFAST486_STATE State,
/* [BX + SI] */
ModRegRm->MemoryAddress = State->GeneralRegs[FAST486_REG_EBX].LowWord
+ State->GeneralRegs[FAST486_REG_ESI].LowWord;
break;
}
@ -895,7 +894,6 @@ Fast486ParseModRegRm(PFAST486_STATE State,
/* [BX + DI] */
ModRegRm->MemoryAddress = State->GeneralRegs[FAST486_REG_EBX].LowWord
+ State->GeneralRegs[FAST486_REG_EDI].LowWord;
break;
}
@ -904,7 +902,6 @@ Fast486ParseModRegRm(PFAST486_STATE State,
/* SS:[BP + SI] */
ModRegRm->MemoryAddress = State->GeneralRegs[FAST486_REG_EBP].LowWord
+ State->GeneralRegs[FAST486_REG_ESI].LowWord;
break;
}
@ -913,7 +910,6 @@ Fast486ParseModRegRm(PFAST486_STATE State,
/* SS:[BP + DI] */
ModRegRm->MemoryAddress = State->GeneralRegs[FAST486_REG_EBP].LowWord
+ State->GeneralRegs[FAST486_REG_EDI].LowWord;
break;
}
@ -921,7 +917,6 @@ Fast486ParseModRegRm(PFAST486_STATE State,
{
/* [SI] */
ModRegRm->MemoryAddress = State->GeneralRegs[FAST486_REG_ESI].LowWord;
break;
}
@ -929,7 +924,6 @@ Fast486ParseModRegRm(PFAST486_STATE State,
{
/* [DI] */
ModRegRm->MemoryAddress = State->GeneralRegs[FAST486_REG_EDI].LowWord;
break;
}
@ -953,7 +947,6 @@ Fast486ParseModRegRm(PFAST486_STATE State,
{
/* [BX] */
ModRegRm->MemoryAddress = State->GeneralRegs[FAST486_REG_EBX].LowWord;
break;
}
}

2
reactos/lib/fast486/debug.c
View file

@ -137,7 +137,7 @@ Fast486DumpState(PFAST486_STATE State)
{
DbgPrint("\nFast486DumpState -->\n");
DbgPrint("\nCPU currently executing in %s mode at %04X:%08X\n",
(State->ControlRegisters[0] & FAST486_CR0_PE) ? "protected" : "real",
(State->ControlRegisters[FAST486_REG_CR0] & FAST486_CR0_PE) ? "protected" : "real",
State->SegmentRegs[FAST486_REG_CS].Selector,
State->InstPtr.Long);
DbgPrint("\nGeneral purpose registers:\n"

2
reactos/lib/fast486/fast486.c
View file

@ -54,9 +54,9 @@ Fast486ExecutionControl(PFAST486_STATE State, FAST486_EXEC_CMD Command)
/* Main execution loop */
do
{
NextInst:
if (!State->Halted)
{
NextInst:
/* Check if this is a new instruction */
if (State->PrefixFlags == 0) State->SavedInstPtr = State->InstPtr;

3
reactos/lib/fast486/opcodes.c
View file

@ -4985,8 +4985,7 @@ FAST486_OPCODE_HANDLER(Fast486OpcodeLoop)
/* Additional rule for LOOPNZ */
if (State->Flags.Zf) Condition = FALSE;
}
if (Opcode == 0xE1)
else if (Opcode == 0xE1)
{
/* Additional rule for LOOPZ */
if (!State->Flags.Zf) Condition = FALSE;