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7c73e239b01258d476a49367da1d7be5872893da
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259 Commits
Author SHA1 Message Date
Aleksandar Andrejevic c3e55a625c [FAST486] 
Actually, we should return FALSE if any exception occurred...


svn path=/branches/ntvdm/; revision=62325
 2014-02-25 00:26:00 +00:00
Aleksandar Andrejevic 8abb2bdad6 [FAST486] 
Return TRUE if nothing unexpected occurred.


svn path=/branches/ntvdm/; revision=62324
 2014-02-25 00:02:54 +00:00
Aleksandar Andrejevic e61c05c35c [FAST486] 
Add missing returns after calls to Fast486Exception.


svn path=/branches/ntvdm/; revision=62316
 2014-02-24 03:53:02 +00:00
Hermès Bélusca-Maïto ec52f30bc5 [FAST486] 
- Fix return values of Fast486OpcodeSahf and Fast486OpcodeLahf handlers.
- [TheFlash], can you please see what we should return after calling Fast486ExceptionWithErrorCode in Fast486OpcodePopFlags ?

svn path=/branches/ntvdm/; revision=62313
 2014-02-23 21:02:02 +00:00
Amine Khaldi 121bde3b83 * Sync up to trunk HEAD (r62286). 
svn path=/branches/ntvdm/; revision=62287
 2014-02-22 10:50:51 +00:00
Aleksandar Andrejevic 0b434e7c6c [FAST486] 
Add a macro ALIGNMENT_CHECK that checks for unaligned pointers and generates an exception.


svn path=/branches/ntvdm/; revision=62279
 2014-02-21 01:29:13 +00:00
Aleksandar Andrejevic 011259b78f [FAST486] 
Update the AC flag in the POPF instruction.


svn path=/branches/ntvdm/; revision=62278
 2014-02-21 01:15:03 +00:00
Aleksandar Andrejevic b9dd7fc5fc [FAST486] 
Enable the Alignment Check flag. Apparently the 486 supports it.


svn path=/branches/ntvdm/; revision=62277
 2014-02-21 01:05:47 +00:00
Hermès Bélusca-Maïto a4f4c415ac [FAST486] 
- When pushing 16-bit value, check only low word of ESP (i.e. SP).
- Don't forget to clear high word of EIP, for the Jump instruction of group 4 (0xFF).

svn path=/branches/ntvdm/; revision=62258
 2014-02-19 20:24:53 +00:00
Hermès Bélusca-Maïto 87ac13a950 [FAST486]: Hardcoded_values--; 
svn path=/branches/ntvdm/; revision=62256
 2014-02-19 19:27:05 +00:00
Hermès Bélusca-Maïto 852cd2db79 [FAST486]: Fix argument type. 
svn path=/branches/ntvdm/; revision=62255
 2014-02-19 19:23:36 +00:00
Hermès Bélusca-Maïto 5380113016 Sync with trunk rev.61910 to get latest improvements and bugfixes. 
svn path=/branches/ntvdm/; revision=61911
 2014-02-01 22:56:13 +00:00
Hermès Bélusca-Maïto 3224e67cfc Sync to trunk revision 61757. 
svn path=/branches/ntvdm/; revision=61758
 2014-01-22 22:56:41 +00:00
Aleksandar Andrejevic 6e741d3856 [FAST486] 
Implement the LAR instruction.


svn path=/branches/ntvdm/; revision=61650
 2014-01-17 03:15:27 +00:00
Hermès Bélusca-Maïto 49ab546ac3 Sync up with trunk r61578. 
svn path=/branches/ntvdm/; revision=61579
 2014-01-11 00:00:10 +00:00
Aleksandar Andrejevic d07be4e31b [FAST486]: Fix a comment. 
svn path=/branches/ntvdm/; revision=61310
 2013-12-21 03:50:19 +00:00
Aleksandar Andrejevic 3dd500ab28 [FAST486] 
Implement the LSL instruction.
Remove instructions that don't exist on a 486 from the TODO list.


svn path=/branches/ntvdm/; revision=61309
 2013-12-21 03:48:46 +00:00
Aleksandar Andrejevic f8861a562a [FAST486] 
Remove the waiting code for the HLT instruction until I figure out how to do it properly.


svn path=/branches/ntvdm/; revision=61276
 2013-12-15 05:08:57 +00:00
Aleksandar Andrejevic ec32b3ef34 [FAST486] 
Fix the calculation of PageLength for the last page.


svn path=/branches/ntvdm/; revision=61275
 2013-12-15 05:02:59 +00:00
Aleksandar Andrejevic 4c80791d47 [FAST486] 
Fix linear memory access when paging is enabled.


svn path=/branches/ntvdm/; revision=61274
 2013-12-15 04:15:03 +00:00
Aleksandar Andrejevic efcf73c467 [FAST486] 
The LDT can be loaded with a NULL descriptor. That invalidates the LDT but doesn't cause
any exception.


svn path=/branches/ntvdm/; revision=61269
 2013-12-14 02:30:42 +00:00
Aleksandar Andrejevic 18b844dffa [FAST486] 
Fix the emulation of the Local Descriptor Table.


svn path=/branches/ntvdm/; revision=61268
 2013-12-14 02:13:01 +00:00
Aleksandar Andrejevic 5303c91efa [FAST486] 
Implement the extended opcode group 0x0F, 0x00 (SLDT, STR, LLDT, LTR, VERR, VERW).


svn path=/branches/ntvdm/; revision=61264
 2013-12-13 03:32:41 +00:00
Hermès Bélusca-Maïto a2bd742ecd [FAST486] 
- Call Fast486GetCurrentPrivLevel only when needed.
- Fix a type.

svn path=/branches/ntvdm/; revision=61211
 2013-12-03 23:51:51 +00:00
Aleksandar Andrejevic 978c08c15c [FAST486] 
Implement the BOUND instruction.


svn path=/branches/ntvdm/; revision=61205
 2013-12-03 01:30:15 +00:00
Aleksandar Andrejevic 2064d10bad [FAST486] 
Check for division by zero, and generate the appropriate exception.


svn path=/branches/ntvdm/; revision=61204
 2013-12-03 00:56:47 +00:00
Aleksandar Andrejevic e7a6deb93f [FAST486] 
The current "fast" method used in MOVS gives incorrect results. It has been temporarily
replaced with a slow method that works correctly.
The string functions do nothing when CX is 0 on entry, fix CMPS and SCAS.


svn path=/branches/ntvdm/; revision=61203
 2013-12-03 00:12:55 +00:00
Aleksandar Andrejevic 03ecfdff3f [FAST486] 
Fix MOVS and STOS when DF = 1. The starting position in the block was off by 1.


svn path=/branches/ntvdm/; revision=61163
 2013-12-01 03:16:49 +00:00
Aleksandar Andrejevic ba237b0251 [FAST486] 
Revert r61158, and fix the prefix issue correctly, but resetting the flags
again after the call to Fast486InterruptInternal.


svn path=/branches/ntvdm/; revision=61160
 2013-11-30 23:45:59 +00:00
Aleksandar Andrejevic 7393337fcf [FAST486] 
Use the size of CS, and not SS, in Fast486OpcodePopReg.


svn path=/branches/ntvdm/; revision=61159
 2013-11-30 23:14:54 +00:00
Aleksandar Andrejevic 2cbcfd75c5 [FAST486] 
Move the prefix reset below the interrupt check, because Fast486InterruptInternal
might set OPSIZE in some circumstances.


svn path=/branches/ntvdm/; revision=61158
 2013-11-30 22:17:18 +00:00
Aleksandar Andrejevic 9c6b9c9bab [FAST486] 
FPU instructions never generate #UD. If CR0.EM is set, they generate #NM.
If there is no FPU and CR0.EM is cleared, they do nothing.
Add a helper macro FPU_ST for accessing FPU registers.
Add a compile-time option to disable the FPU.


svn path=/branches/ntvdm/; revision=61150
 2013-11-30 02:03:51 +00:00
Aleksandar Andrejevic 81c27b5b19 [FAST486] 
Start implementing the FPU. Stubplement the FPU opcode handlers.


svn path=/branches/ntvdm/; revision=61141
 2013-11-29 03:00:59 +00:00
Aleksandar Andrejevic d358641f7c [FAST486] 
Fix the order of operations.


svn path=/branches/ntvdm/; revision=61106
 2013-11-26 18:11:53 +00:00
Aleksandar Andrejevic 556bace69f [FAST486] 
Complete the previous commit with a fix for Fast486WriteLinearMemory too.


svn path=/branches/ntvdm/; revision=61105
 2013-11-26 17:56:18 +00:00
Aleksandar Andrejevic f45361126f [FAST486] 
Handle the case when the last page is also the first page in Fast486ReadLinearMemory ( when paging is enabled).


svn path=/branches/ntvdm/; revision=61104
 2013-11-26 17:55:07 +00:00
Aleksandar Andrejevic 8e356f7a95 [FAST486] 
The 486 doesn't have AC, VIF, VIP or ID.
Fix and simplify POPF.
[NTVDM]
Fix the count in the XMS copy function (INT 15h, AH = 87h).


svn path=/branches/ntvdm/; revision=61082
 2013-11-23 01:34:03 +00:00
Aleksandar Andrejevic 9a8c7e2a04 [FAST486] 
Fix CF calculation in SHRD/SHLD.


svn path=/branches/ntvdm/; revision=61070
 2013-11-22 02:47:48 +00:00
Aleksandar Andrejevic 24954c9d07 [FAST486] 
DAA, DAS: Update the flags.
AAA, AAS: Subtract from AX instead of AL. The specification says AL, but
so far in all known CPUs and emulators, AX is subtracted.
AAD: Clear AH.


svn path=/branches/ntvdm/; revision=61069
 2013-11-22 02:02:05 +00:00
Aleksandar Andrejevic 363543b325 [FAST486] 
Fix the calculation of AF in ADC and the calculation of AF and CF in SBB.


svn path=/branches/ntvdm/; revision=61068
 2013-11-22 01:22:00 +00:00
Aleksandar Andrejevic c0d571c92a [FAST486] 
In the string functions, use ADSIZE and not OPSIZE.
In SCAS and CMPS, fix the "(1 << 32) - 1" bug.


svn path=/branches/ntvdm/; revision=61067
 2013-11-22 00:46:28 +00:00
Aleksandar Andrejevic 9c999826e1 [FAST486] 
Put the conditional expression in parenthesis so that the addition happens after it.


svn path=/branches/ntvdm/; revision=61063
 2013-11-21 04:07:15 +00:00
Aleksandar Andrejevic 37b16fec31 [FAST486] 
Fix a bug in Fast486LoadSegment.


svn path=/branches/ntvdm/; revision=61062
 2013-11-21 03:18:34 +00:00
Aleksandar Andrejevic f90a1db2b7 [FAST486] 
The top half of EIP is cleared after a 16-bit jump.


svn path=/branches/ntvdm/; revision=61058
 2013-11-20 14:21:47 +00:00
Aleksandar Andrejevic 459e3a6f48 [FAST486] 
Read the LDT instead of the GDT when the table indicator is set.


svn path=/branches/ntvdm/; revision=61057
 2013-11-20 10:48:26 +00:00
Aleksandar Andrejevic e2fb91925e [FAST486] 
Implement privilege checks when loading the code selector.


svn path=/branches/ntvdm/; revision=61056
 2013-11-20 10:43:12 +00:00
Aleksandar Andrejevic b456a8b355 [FAST486] 
Make the parameters to Fast486ReadModrm*Operands optional, so that
unnecessary extra reads aren't performed. This also eliminates the
need for dummy variables.


svn path=/branches/ntvdm/; revision=61055
 2013-11-20 08:01:10 +00:00
Hermès Bélusca-Maïto 8998a96d56 [NTVDM] : Implement getMSW and setMSW for getting and setting the Machine Status Word (lower word of CR0). 
[FAST486]: MSW = Machine Status Word

svn path=/branches/ntvdm/; revision=61044
 2013-11-18 20:25:10 +00:00
Aleksandar Andrejevic 4b005f11bf [FAST486] 
- When accessing memory using ESP, make the SS segment default.
- The INT instructions always pushes 16-bit values in real mode, regardless
  of the operand/address size attributes.


svn path=/branches/ntvdm/; revision=61000
 2013-11-15 20:49:48 +00:00
Aleksandar Andrejevic f5d0d3e784 [FAST486] 
The CS cached descriptor has the default operand size, even for stack
operations.


svn path=/branches/ntvdm/; revision=60996
 2013-11-15 04:16:25 +00:00