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[FAST486]

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Create a macro SWAP (swaps two variables) to shorten the code.
Implement the BSWAP instruction.


svn path=/branches/ntvdm/; revision=60717
This commit is contained in:
Aleksandar Andrejevic 2013-10-20 00:55:31 +00:00
parent a93095e678
commit 67b093f38c
4 changed files with 33 additions and 26 deletions
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1
lib/fast486/common.h
View file

@ -54,6 +54,7 @@
{\
x = !x;\
}
#define SWAP(x, y) { (x) ^= (y); (y) ^= (x); (x) ^= (y); }
#define PAGE_ALIGN(x) ((x) & 0xFFFFF000)
#define PAGE_OFFSET(x) ((x) & 0x00000FFF)

33
lib/fast486/extraops.c
View file

@ -238,14 +238,14 @@ Fast486ExtendedHandlers[FAST486_NUM_OPCODE_HANDLERS] =
NULL, // Invalid
NULL, // Invalid
NULL, // Invalid
NULL, // TODO: OPCODE 0xC8 NOT IMPLEMENTED
NULL, // TODO: OPCODE 0xC9 NOT IMPLEMENTED
NULL, // TODO: OPCODE 0xCA NOT IMPLEMENTED
NULL, // TODO: OPCODE 0xCB NOT IMPLEMENTED
NULL, // TODO: OPCODE 0xCC NOT IMPLEMENTED
NULL, // TODO: OPCODE 0xCD NOT IMPLEMENTED
NULL, // TODO: OPCODE 0xCE NOT IMPLEMENTED
NULL, // TODO: OPCODE 0xCF NOT IMPLEMENTED
Fast486ExtOpcodeBswap,
Fast486ExtOpcodeBswap,
Fast486ExtOpcodeBswap,
Fast486ExtOpcodeBswap,
Fast486ExtOpcodeBswap,
Fast486ExtOpcodeBswap,
Fast486ExtOpcodeBswap,
Fast486ExtOpcodeBswap,
NULL, // Invalid
NULL, // Invalid
NULL, // Invalid
@ -1021,6 +1021,23 @@ FAST486_OPCODE_HANDLER(Fast486ExtOpcodeConditionalSet)
return Fast486WriteModrmByteOperands(State, &ModRegRm, FALSE, Value);
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBswap)
{
PUCHAR Pointer;
NO_LOCK_PREFIX();
/* Get a pointer to the value */
Pointer = (PUCHAR)&State->GeneralRegs[Opcode & 0x07].Long;
/* Swap the byte order */
SWAP(Pointer[0], Pointer[3]);
SWAP(Pointer[1], Pointer[2]);
/* Return success */
return TRUE;
}
FAST486_OPCODE_HANDLER(Fast486OpcodeExtended)
{
UCHAR SecondOpcode;

1
lib/fast486/extraops.h
View file

@ -35,6 +35,7 @@ FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBtr);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBtc);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeConditionalJmp);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeConditionalSet);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBswap);
FAST486_OPCODE_HANDLER(Fast486OpcodeExtended);
#endif // _EXTRAOPS_H_

24
lib/fast486/opcodes.c
View file

@ -2743,9 +2743,7 @@ FAST486_OPCODE_HANDLER(Fast486OpcodeSbbByteModrm)
if (!(Opcode & FAST486_OPCODE_WRITE_REG))
{
/* Swap the order */
FirstValue ^= SecondValue;
SecondValue ^= FirstValue;
FirstValue ^= SecondValue;
SWAP(FirstValue, SecondValue);
}
/* Calculate the result */
@ -2806,9 +2804,7 @@ FAST486_OPCODE_HANDLER(Fast486OpcodeSbbModrm)
if (!(Opcode & FAST486_OPCODE_WRITE_REG))
{
/* Swap the order */
FirstValue ^= SecondValue;
SecondValue ^= FirstValue;
FirstValue ^= SecondValue;
SWAP(FirstValue, SecondValue);
}
/* Calculate the result */
@ -2846,9 +2842,7 @@ FAST486_OPCODE_HANDLER(Fast486OpcodeSbbModrm)
if (!(Opcode & FAST486_OPCODE_WRITE_REG))
{
/* Swap the order */
FirstValue ^= SecondValue;
SecondValue ^= FirstValue;
FirstValue ^= SecondValue;
SWAP(FirstValue, SecondValue);
}
/* Calculate the result */
@ -3067,9 +3061,7 @@ FAST486_OPCODE_HANDLER(Fast486OpcodeCmpSubByteModrm)
if (!(Opcode & FAST486_OPCODE_WRITE_REG))
{
/* Swap the order */
FirstValue ^= SecondValue;
SecondValue ^= FirstValue;
FirstValue ^= SecondValue;
SWAP(FirstValue, SecondValue);
}
/* Calculate the result */
@ -3138,9 +3130,7 @@ FAST486_OPCODE_HANDLER(Fast486OpcodeCmpSubModrm)
if (!(Opcode & FAST486_OPCODE_WRITE_REG))
{
/* Swap the order */
FirstValue ^= SecondValue;
SecondValue ^= FirstValue;
FirstValue ^= SecondValue;
SWAP(FirstValue, SecondValue);
}
/* Calculate the result */
@ -3187,9 +3177,7 @@ FAST486_OPCODE_HANDLER(Fast486OpcodeCmpSubModrm)
if (!(Opcode & FAST486_OPCODE_WRITE_REG))
{
/* Swap the order */
FirstValue ^= SecondValue;
SecondValue ^= FirstValue;
FirstValue ^= SecondValue;
SWAP(FirstValue, SecondValue);
}
/* Calculate the result */