mirror of
https://github.com/reactos/reactos.git
synced 2024-10-04 00:13:57 +00:00
[SOFT386]
Implement instruction fetch functions. Implement CPU exception system. svn path=/branches/ntvdm/; revision=59782
This commit is contained in:
parent
2672ec8ee5
commit
6f769d6314
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@ -28,6 +28,12 @@
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#define SOFT386_CR0_CD (1 << 30)
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#define SOFT386_CR0_PG (1 << 31)
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#define SOFT386_IDT_TASK_GATE 0x5
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#define SOFT386_IDT_INT_GATE 0x6
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#define SOFT386_IDT_TRAP_GATE 0x7
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#define SOFT386_IDT_INT_GATE_32 0xE
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#define SOFT386_IDT_TRAP_GATE_32 0xF
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struct _SOFT386_STATE;
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typedef struct _SOFT386_STATE SOFT386_STATE, *PSOFT386_STATE;
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@ -77,6 +83,26 @@ enum _SOFT386_DBG_REGS
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SOFT386_REG_DR7
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};
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enum _SOFT386_EXCEPTIONS
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{
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SOFT386_EXCEPTION_DE = 0x00,
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SOFT386_EXCEPTION_DB = 0x01,
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SOFT386_EXCEPTION_BP = 0x03,
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SOFT386_EXCEPTION_OF = 0x04,
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SOFT386_EXCEPTION_BR = 0x05,
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SOFT386_EXCEPTION_UD = 0x06,
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SOFT386_EXCEPTION_NM = 0x07,
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SOFT386_EXCEPTION_DF = 0x08,
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SOFT386_EXCEPTION_TS = 0x0A,
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SOFT386_EXCEPTION_NP = 0x0B,
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SOFT386_EXCEPTION_SS = 0x0C,
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SOFT386_EXCEPTION_GP = 0x0D,
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SOFT386_EXCEPTION_PF = 0x0E,
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SOFT386_EXCEPTION_MF = 0x10,
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SOFT386_EXCEPTION_AC = 0x11,
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SOFT386_EXCEPTION_MC = 0x12
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};
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typedef
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BOOLEAN
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(NTAPI *SOFT386_MEM_READ_PROC)
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@ -162,7 +188,7 @@ typedef struct
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ULONG Size : 1;
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ULONG Granularity : 1;
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ULONG BaseHigh : 8;
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} SOFT386_GDT_ENTRY;
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} SOFT386_GDT_ENTRY, *PSOFT386_GDT_ENTRY;
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typedef struct
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{
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@ -174,12 +200,12 @@ typedef struct
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ULONG Dpl : 2;
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ULONG Present : 1;
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ULONG OffsetHigh : 16;
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} SOFT386_IDT_ENTRY;
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} SOFT386_IDT_ENTRY, *PSOFT386_IDT_ENTRY;
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typedef struct _SOFT386_TABLE_REG
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{
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USHORT Size;
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ULONG Address;
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ULONG Address;
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} SOFT386_TABLE_REG, *PSOFT386_TABLE_REG;
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typedef union _SOFT386_FLAGS_REG
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@ -255,6 +281,7 @@ struct _SOFT386_STATE
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ULONGLONG TimeStampCounter;
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ULONG ControlRegisters[SOFT386_NUM_CTRL_REGS];
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ULONG DebugRegisters[SOFT386_NUM_DBG_REGS];
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ULONG ExceptionCount;
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};
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/* FUNCTIONS ******************************************************************/
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@ -50,7 +50,7 @@ Soft386ReadMemory(PSOFT386_STATE State,
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if ((Offset + Size) >= CachedDescriptor->Limit)
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{
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/* Read beyond limit */
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// TODO: Generate exception #GP
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Soft386Exception(State, SOFT386_EXCEPTION_GP);
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return FALSE;
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}
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@ -62,13 +62,13 @@ Soft386ReadMemory(PSOFT386_STATE State,
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if (!CachedDescriptor->Present)
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{
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// TODO: Generate exception #NP
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Soft386Exception(State, SOFT386_EXCEPTION_NP);
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return FALSE;
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}
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if (GET_SEGMENT_RPL(CachedDescriptor->Selector) > CachedDescriptor->Dpl)
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{
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// TODO: Generate exception #GP
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Soft386Exception(State, SOFT386_EXCEPTION_GP);
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return FALSE;
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}
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@ -78,7 +78,7 @@ Soft386ReadMemory(PSOFT386_STATE State,
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{
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/* Data segment not executable */
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// TODO: Generate exception #GP
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Soft386Exception(State, SOFT386_EXCEPTION_GP);
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return FALSE;
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}
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}
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@ -88,7 +88,7 @@ Soft386ReadMemory(PSOFT386_STATE State,
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{
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/* Code segment not readable */
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// TODO: Generate exception #GP
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Soft386Exception(State, SOFT386_EXCEPTION_GP);
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return FALSE;
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}
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}
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@ -133,7 +133,7 @@ Soft386WriteMemory(PSOFT386_STATE State,
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if ((Offset + Size) >= CachedDescriptor->Limit)
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{
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/* Write beyond limit */
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// TODO: Generate exception #GP
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Soft386Exception(State, SOFT386_EXCEPTION_GP);
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return FALSE;
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}
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@ -145,13 +145,13 @@ Soft386WriteMemory(PSOFT386_STATE State,
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if (!CachedDescriptor->Present)
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{
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// TODO: Generate exception #NP
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Soft386Exception(State, SOFT386_EXCEPTION_NP);
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return FALSE;
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}
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if (GET_SEGMENT_RPL(CachedDescriptor->Selector) > CachedDescriptor->Dpl)
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{
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// TODO: Generate exception #GP
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Soft386Exception(State, SOFT386_EXCEPTION_GP);
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return FALSE;
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}
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@ -159,14 +159,14 @@ Soft386WriteMemory(PSOFT386_STATE State,
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{
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/* Code segment not writable */
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// TODO: Generate exception #GP
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Soft386Exception(State, SOFT386_EXCEPTION_GP);
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return FALSE;
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}
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else if (!CachedDescriptor->ReadWrite)
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{
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/* Data segment not writeable */
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// TODO: Generate exception #GP
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Soft386Exception(State, SOFT386_EXCEPTION_GP);
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return FALSE;
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}
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}
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@ -207,7 +207,7 @@ Soft386StackPush(PSOFT386_STATE State, ULONG Value)
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if (State->GeneralRegs[SOFT386_REG_ESP].Long >= 1
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&& State->GeneralRegs[SOFT386_REG_ESP].Long <= 3)
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{
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// TODO: Exception #SS
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Soft386Exception(State, SOFT386_EXCEPTION_SS);
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return FALSE;
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}
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@ -229,7 +229,7 @@ Soft386StackPush(PSOFT386_STATE State, ULONG Value)
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/* Check if SP is 1 */
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if (State->GeneralRegs[SOFT386_REG_ESP].Long == 1)
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{
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// TODO: Exception #SS
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Soft386Exception(State, SOFT386_EXCEPTION_SS);
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return FALSE;
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}
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@ -262,7 +262,7 @@ Soft386StackPop(PSOFT386_STATE State, PULONG Value)
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/* Check if ESP is 0xFFFFFFFF */
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if (State->GeneralRegs[SOFT386_REG_ESP].Long == 0xFFFFFFFF)
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{
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// TODO: Exception #SS
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Soft386Exception(State, SOFT386_EXCEPTION_SS);
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return FALSE;
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}
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@ -291,7 +291,7 @@ Soft386StackPop(PSOFT386_STATE State, PULONG Value)
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/* Check if SP is 0xFFFF */
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if (State->GeneralRegs[SOFT386_REG_ESP].LowWord == 0xFFFF)
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{
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// TODO: Exception #SS
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Soft386Exception(State, SOFT386_EXCEPTION_SS);
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return FALSE;
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}
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@ -319,7 +319,7 @@ Soft386StackPop(PSOFT386_STATE State, PULONG Value)
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inline
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BOOLEAN
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Soft386LoadSegment(PSOFT386_STATE State, INT Segment, WORD Selector)
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Soft386LoadSegment(PSOFT386_STATE State, INT Segment, USHORT Selector)
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{
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PSOFT386_SEG_REG CachedDescriptor;
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SOFT386_GDT_ENTRY GdtEntry;
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@ -335,7 +335,7 @@ Soft386LoadSegment(PSOFT386_STATE State, INT Segment, WORD Selector)
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/* Make sure the GDT contains the entry */
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if (GET_SEGMENT_INDEX(Selector) >= (State->Gdtr.Size + 1))
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{
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// TODO: Exception #GP
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Soft386Exception(State, SOFT386_EXCEPTION_GP);
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return FALSE;
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}
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@ -362,26 +362,26 @@ Soft386LoadSegment(PSOFT386_STATE State, INT Segment, WORD Selector)
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{
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if (GET_SEGMENT_INDEX(Selector) == 0)
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{
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// TODO: Exception #GP
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Soft386Exception(State, SOFT386_EXCEPTION_GP);
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return FALSE;
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}
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if (GdtEntry.Executable || !GdtEntry.ReadWrite)
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{
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// TODO: Exception #GP
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Soft386Exception(State, SOFT386_EXCEPTION_GP);
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return FALSE;
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}
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if ((GET_SEGMENT_RPL(Selector) != Soft386GetCurrentPrivLevel(State))
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|| (GET_SEGMENT_RPL(Selector) != GdtEntry.Dpl))
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{
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// TODO: Exception #GP
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Soft386Exception(State, SOFT386_EXCEPTION_GP);
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return FALSE;
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}
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if (!GdtEntry.Present)
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{
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// TODO: Exception #SS
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Soft386Exception(State, SOFT386_EXCEPTION_SS);
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return FALSE;
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}
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}
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@ -390,13 +390,13 @@ Soft386LoadSegment(PSOFT386_STATE State, INT Segment, WORD Selector)
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if ((GET_SEGMENT_RPL(Selector) > GdtEntry.Dpl)
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&& (Soft386GetCurrentPrivLevel(State) > GdtEntry.Dpl))
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{
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// TODO: Exception #GP
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Soft386Exception(State, SOFT386_EXCEPTION_GP);
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return FALSE;
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}
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if (!GdtEntry.Present)
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{
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// TODO: Exception #NP
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Soft386Exception(State, SOFT386_EXCEPTION_NP);
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return FALSE;
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}
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}
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@ -427,4 +427,329 @@ Soft386LoadSegment(PSOFT386_STATE State, INT Segment, WORD Selector)
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return TRUE;
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}
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inline
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BOOLEAN
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Soft386FetchByte(PSOFT386_STATE State, PUCHAR Data)
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{
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PSOFT386_SEG_REG CachedDescriptor;
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/* Get the cached descriptor of CS */
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CachedDescriptor = &State->SegmentRegs[SOFT386_REG_CS];
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/* Read from memory */
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if (!Soft386ReadMemory(State,
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SOFT386_REG_CS,
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(CachedDescriptor->Size) ? State->InstPtr.Long
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: State->InstPtr.LowWord,
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TRUE,
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Data,
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sizeof(UCHAR)))
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{
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/* Exception occurred during instruction fetch */
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return FALSE;
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}
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/* Advance the instruction pointer */
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if (CachedDescriptor->Size) State->InstPtr.Long++;
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else State->InstPtr.LowWord++;
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return TRUE;
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}
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inline
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BOOLEAN
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Soft386FetchWord(PSOFT386_STATE State, PUSHORT Data)
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{
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PSOFT386_SEG_REG CachedDescriptor;
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/* Get the cached descriptor of CS */
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CachedDescriptor = &State->SegmentRegs[SOFT386_REG_CS];
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/* Read from memory */
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// FIXME: Fix byte order on big-endian machines
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if (!Soft386ReadMemory(State,
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SOFT386_REG_CS,
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(CachedDescriptor->Size) ? State->InstPtr.Long
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: State->InstPtr.LowWord,
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TRUE,
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Data,
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sizeof(USHORT)))
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{
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/* Exception occurred during instruction fetch */
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return FALSE;
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}
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/* Advance the instruction pointer */
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if (CachedDescriptor->Size) State->InstPtr.Long += sizeof(USHORT);
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else State->InstPtr.LowWord += sizeof(USHORT);
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return TRUE;
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}
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inline
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BOOLEAN
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Soft386FetchDword(PSOFT386_STATE State, PULONG Data)
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{
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PSOFT386_SEG_REG CachedDescriptor;
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/* Get the cached descriptor of CS */
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CachedDescriptor = &State->SegmentRegs[SOFT386_REG_CS];
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/* Read from memory */
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// FIXME: Fix byte order on big-endian machines
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if (!Soft386ReadMemory(State,
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SOFT386_REG_CS,
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(CachedDescriptor->Size) ? State->InstPtr.Long
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: State->InstPtr.LowWord,
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TRUE,
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Data,
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sizeof(ULONG)))
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{
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/* Exception occurred during instruction fetch */
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return FALSE;
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}
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/* Advance the instruction pointer */
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if (CachedDescriptor->Size) State->InstPtr.Long += sizeof(ULONG);
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else State->InstPtr.LowWord += sizeof(ULONG);
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return TRUE;
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}
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inline
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BOOLEAN
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Soft386InterruptInternal(PSOFT386_STATE State,
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USHORT SegmentSelector,
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ULONG Offset,
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BOOLEAN InterruptGate)
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{
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/* Check for protected mode */
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if (State->ControlRegisters[SOFT386_REG_CR0] & SOFT386_CR0_PE)
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{
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SOFT386_TSS Tss;
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USHORT OldSs = State->SegmentRegs[SOFT386_REG_SS].Selector;
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ULONG OldEsp = State->GeneralRegs[SOFT386_REG_ESP].Long;
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/* Check if the interrupt handler is more privileged */
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if (Soft386GetCurrentPrivLevel(State) > GET_SEGMENT_RPL(SegmentSelector))
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{
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/* Read the TSS */
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// FIXME: This code is only correct when paging is disabled!!!
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if (State->MemReadCallback)
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{
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State->MemReadCallback(State,
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State->Tss.Address,
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&Tss,
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sizeof(Tss));
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}
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else
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{
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RtlMoveMemory(&Tss, (PVOID)State->Tss.Address, sizeof(Tss));
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}
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/* Check the new (higher) privilege level */
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switch (GET_SEGMENT_RPL(SegmentSelector))
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{
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case 0:
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{
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if (!Soft386LoadSegment(State, SOFT386_REG_SS, Tss.Ss0))
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{
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/* Exception occurred */
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return FALSE;
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}
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State->GeneralRegs[SOFT386_REG_ESP].Long = Tss.Esp0;
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break;
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}
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case 1:
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{
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if (!Soft386LoadSegment(State, SOFT386_REG_SS, Tss.Ss1))
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{
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/* Exception occurred */
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return FALSE;
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}
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State->GeneralRegs[SOFT386_REG_ESP].Long = Tss.Esp1;
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break;
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}
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case 2:
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{
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if (!Soft386LoadSegment(State, SOFT386_REG_SS, Tss.Ss2))
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{
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/* Exception occurred */
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return FALSE;
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}
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State->GeneralRegs[SOFT386_REG_ESP].Long = Tss.Esp2;
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break;
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}
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default:
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{
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/* Should never reach here! */
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ASSERT(FALSE);
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}
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}
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/* Push SS selector */
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if (!Soft386StackPush(State, OldSs)) return FALSE;
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/* Push stack pointer */
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if (Soft386StackPush(State, OldEsp)) return FALSE;
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}
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}
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/* Push EFLAGS */
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if (!Soft386StackPush(State, State->Flags.Long)) return FALSE;
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/* Push CS selector */
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if (!Soft386StackPush(State, State->SegmentRegs[SOFT386_REG_CS].Selector)) return FALSE;
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/* Push the instruction pointer */
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if (!Soft386StackPush(State, State->InstPtr.Long)) return FALSE;
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if (InterruptGate)
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{
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/* Disable interrupts after a jump to an interrupt gate handler */
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State->Flags.If = FALSE;
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}
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/* Load new CS */
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if (!Soft386LoadSegment(State, SOFT386_REG_CS, SegmentSelector))
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{
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/* An exception occurred during the jump */
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return FALSE;
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}
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if (State->SegmentRegs[SOFT386_REG_CS].Size)
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{
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/* 32-bit code segment, use EIP */
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State->InstPtr.Long = Offset;
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}
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else
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{
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/* 16-bit code segment, use IP */
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State->InstPtr.LowWord = LOWORD(Offset);
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}
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return TRUE;
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}
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inline
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BOOLEAN
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Soft386GetIntVector(PSOFT386_STATE State,
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UCHAR Number,
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PSOFT386_IDT_ENTRY IdtEntry)
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{
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ULONG FarPointer;
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/* Check for protected mode */
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if (State->ControlRegisters[SOFT386_REG_CR0] & SOFT386_CR0_PE)
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{
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/* Read from the IDT */
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// FIXME: This code is only correct when paging is disabled!!!
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if (State->MemReadCallback)
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{
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State->MemReadCallback(State,
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State->Idtr.Address
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+ Number * sizeof(*IdtEntry),
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IdtEntry,
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sizeof(*IdtEntry));
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}
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else
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{
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RtlMoveMemory(IdtEntry,
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(PVOID)(State->Idtr.Address
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+ Number * sizeof(*IdtEntry)),
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sizeof(*IdtEntry));
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}
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}
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||||
else
|
||||
{
|
||||
/* Read from the real-mode IVT */
|
||||
|
||||
/* Paging is always disabled in real mode */
|
||||
if (State->MemReadCallback)
|
||||
{
|
||||
State->MemReadCallback(State,
|
||||
State->Idtr.Address
|
||||
+ Number * sizeof(FarPointer),
|
||||
&FarPointer,
|
||||
sizeof(FarPointer));
|
||||
}
|
||||
else
|
||||
{
|
||||
RtlMoveMemory(IdtEntry,
|
||||
(PVOID)(State->Idtr.Address
|
||||
+ Number * sizeof(FarPointer)),
|
||||
sizeof(FarPointer));
|
||||
}
|
||||
|
||||
/* Fill a fake IDT entry */
|
||||
IdtEntry->Offset = LOWORD(FarPointer);
|
||||
IdtEntry->Selector = HIWORD(FarPointer);
|
||||
IdtEntry->Zero = 0;
|
||||
IdtEntry->Type = SOFT386_IDT_INT_GATE;
|
||||
IdtEntry->Storage = FALSE;
|
||||
IdtEntry->Dpl = 0;
|
||||
IdtEntry->Present = TRUE;
|
||||
IdtEntry->OffsetHigh = 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Once paging support is implemented this function
|
||||
* will not always return true
|
||||
*/
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
VOID
|
||||
__fastcall
|
||||
Soft386Exception(PSOFT386_STATE State, INT ExceptionCode)
|
||||
{
|
||||
SOFT386_IDT_ENTRY IdtEntry;
|
||||
|
||||
/* Increment the exception count */
|
||||
State->ExceptionCount++;
|
||||
|
||||
/* Check if the exception occurred more than once */
|
||||
if (State->ExceptionCount > 1)
|
||||
{
|
||||
/* Then this is a double fault */
|
||||
ExceptionCode = SOFT386_EXCEPTION_DF;
|
||||
}
|
||||
|
||||
/* Check if this is a triple fault */
|
||||
if (State->ExceptionCount == 3)
|
||||
{
|
||||
/* Reset the CPU */
|
||||
Soft386Reset(State);
|
||||
return;
|
||||
}
|
||||
|
||||
if (!Soft386GetIntVector(State, ExceptionCode, &IdtEntry))
|
||||
{
|
||||
/*
|
||||
* If this function failed, that means Soft386Exception
|
||||
* was called again, so just return in this case.
|
||||
*/
|
||||
return;
|
||||
}
|
||||
|
||||
/* Perform the interrupt */
|
||||
if (!Soft386InterruptInternal(State,
|
||||
IdtEntry.Selector,
|
||||
MAKELONG(IdtEntry.Offset, IdtEntry.OffsetHigh),
|
||||
IdtEntry.Type))
|
||||
{
|
||||
/*
|
||||
* If this function failed, that means Soft386Exception
|
||||
* was called again, so just return in this case.
|
||||
*/
|
||||
return;
|
||||
}
|
||||
}
|
||||
|
||||
/* EOF */
|
||||
|
|
|
@ -61,7 +61,58 @@ Soft386LoadSegment
|
|||
(
|
||||
PSOFT386_STATE State,
|
||||
INT Segment,
|
||||
WORD Selector
|
||||
USHORT Selector
|
||||
);
|
||||
|
||||
inline
|
||||
BOOLEAN
|
||||
Soft386FetchByte
|
||||
(
|
||||
PSOFT386_STATE State,
|
||||
PUCHAR Data
|
||||
);
|
||||
|
||||
inline
|
||||
BOOLEAN
|
||||
Soft386FetchWord
|
||||
(
|
||||
PSOFT386_STATE State,
|
||||
PUSHORT Data
|
||||
);
|
||||
|
||||
inline
|
||||
BOOLEAN
|
||||
Soft386FetchDword
|
||||
(
|
||||
PSOFT386_STATE State,
|
||||
PULONG Data
|
||||
);
|
||||
|
||||
inline
|
||||
BOOLEAN
|
||||
Soft386InterruptInternal
|
||||
(
|
||||
PSOFT386_STATE State,
|
||||
USHORT SegmentSelector,
|
||||
ULONG Offset,
|
||||
BOOLEAN InterruptGate
|
||||
);
|
||||
|
||||
inline
|
||||
BOOLEAN
|
||||
Soft386GetIntVector
|
||||
(
|
||||
PSOFT386_STATE State,
|
||||
UCHAR Number,
|
||||
PSOFT386_IDT_ENTRY IdtEntry
|
||||
);
|
||||
|
||||
VOID
|
||||
__fastcall
|
||||
Soft386Exception
|
||||
(
|
||||
PSOFT386_STATE State,
|
||||
INT ExceptionCode
|
||||
);
|
||||
|
||||
#endif // _COMMON_H_
|
||||
|
|
Loading…
Reference in a new issue