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Commit Graph

14 Commits

Author SHA1 Message Date
BITDEFENDER\vlutas
bf81c647e3 Make sure all flags are set for CMPXCHG (this was left intentionally incomplete).
Make sure we clear upper bits of the 256/512 bit SSE register.
2022-07-19 11:03:17 +03:00
BITDEFENDER\vlutas
6dda2c122c Make sure upper 32 bit of a CMOV destination register is cleared to 0 even if the condition is not satisfied 2022-07-16 12:21:46 +03:00
BITDEFENDER\vlutas
1805a9edec Fixed flag setting for ADC, SBB, SAR and IMUL instructions. 2022-07-14 13:42:37 +03:00
BITDEFENDER\vlutas
412f065965 Moved the formatting function in a dedicated source file.
Added support for SIDT and RDTSC in bdshemu.
2021-10-19 17:33:15 +03:00
Andrei Vlad LUTAS
08096172cc Multiple improvements
- New shemu flag - SHEMU_FLAG_SIDT, set when sheu encounters a SIDT in ring0.
- Added the CET Tracked flag to SYSCLAL, SYSENTER and INT n instructions.
- Fixed Do Not Track prefix recognition for CALL and JMP in long-mode.
- Fixed MONITOR and MONITORX implicit operands - the rAX register encodes a virtual address that will be used as the monitored range. That address is subject to a 1 byte load.
- Fixed RMPADJUST and RMPUPDATE implicit operands - the rAX register encodes a virtual address, and the rCX register encodes a virtual address of the RMP updated entry.
2021-08-31 13:37:50 +03:00
Andrei Vlad LUTAS
5a617986b7 Added new shemu flag: SHEMU_FLAG_SUD_ACCESS is raised whenever the code accesses the SharedUserData page. 2021-08-16 12:34:41 +03:00
Andrei Vlad LUTAS
c8735b437a Fixed NEG emulation - make sure flags are set. 2021-08-10 14:46:39 +03:00
Andrei Vlad LUTAS
f6050661d5 Multiple improvements in bdshemu
Fixed an emulation bug for MOVZX and MOVSX instructions (https://github.com/bitdefender/bddisasm/issues/48)
New shellcode flag - call tot Wow32 reserved.
New shellcode flag - heaven's gate.
New shellcode flag - stack-pivot.
Moved bdshemu tests in a password protected zip file, so it doesn't trigger AV detections.
2021-08-10 11:43:51 +03:00
Andrei Vlad LUTAS
15e5e2db63 Fixed several RFLAGS setting issues with airthmetic and shift instructions. 2021-02-23 18:11:40 +02:00
Andrei Vlad LUTAS
1eb1c9d0d2 Fixed https://github.com/bitdefender/bddisasm/issues/38. 2021-01-15 19:09:53 +02:00
Andrei Vlad LUTAS
ea28907359 Fix potential division error in bdshemu, when the destination operand is not large enough to hold the result. 2020-08-27 16:25:39 +03:00
Andrei Vlad LUTAS
d61a6fa5dd * INC/DEC do not modify the CF.
* Fixed FXSAVE64, PUSHAD and POPAD emulation - when explicit mnemonics were added for them, emulation support was not added, thus causing emulation to stop when encountering one of these.
2020-08-19 19:14:22 +03:00
Andrei Vlad LUTAS
752bc626c4 Fixed RET with immediate - the immediate is not sign-extended.
Fixed VEX decoding in 32 bit mode - vex.vvvv bit 3 is simply ignored.
Fixed several FMA instructions decoding (L/W flag should be ignored).
Print the 64 bit immediate value in disassembly, instead of the raw immediate (note that the operand always contains the sign-extended, full immediate).
XBEGIN always uses 32/64 bit RIP size (0x66 does not affect its size).
Decode WBINVD even if it's preceded by 0x66/0xF2 prefixes.
Several mnemonic fixes (FXSAVE64, FXRSTOR64, PUSHA/PUSHAD...).
Properly decode VPERMIL2* instructions.
Fixed SSE register decoding when it is encoded in immediate.
Decode SCATTER instructions even though they use the VSIB index as source.
Some disp8 fixes (t1s -> t1s8/t1s16).
SYSCALL/SYSRET are decoded and executed in 32 bit compat modem, even though SDM states they are invalid.
RDPID uses 32/64 bit reg size, never 16.
Various other minor tweaks & fixes.
Re-generated the test files, and added some more, new tests.
2020-07-23 14:08:01 +03:00
Andrei Vlad LUTAS
698ba367a1 Initial commit. 2020-07-21 11:19:18 +03:00