Changelog

All notable (user-facing) changes to this project will be documented in this file.

The format is based on Keep a Changelog.

[2.1.3] - 2024-03-04

Aligned BDDISASM APX instructions syntax with some of the Intel recomandations (using the suffix notation for NF and ZU indications, using finite set notation for DFV operands).

The ZU indication is appended as a mnemonic sufix, as per recomandations. However, in case of SETcc instructions, BDDISASM will append the ZU indication AFTER the condition code (similar to CMPccXADD and with initial SETcc.ZU specification).
The DFV (default flags value) operand obeys the finite set notation, but it is placed as the last operand of the instruction.

Support in bddisasm for Intel REX2 prefix.
Support in bddisasm for Intel APX extensions.
Support in bddisasm for Intel USERMSR extensions.
Support in bddisasm for prefix activation fields inside INSTRUX - these fields can be consulted to determine whether a particular prefix is present, accepted & active.
New feature in bdshemu: SHEMU_OPT_DIRECT_MAPPED_SHELL - allows emulation with a smaller IntBuff at the cost of not having WRITE_SELF detections. The shellcode can be provided directly from its original location, without the need to allocate it in a dedicated memory region.
New feature in bdshemu: SHEMU_OPT_TRACK_LOOPS - loops can now be tracked by bdshemu. SHEMU_OPT_TRACE_LOOPS can be used to log loop information.
Support in bdshemu for APX instructions (both REX2 and EVEX encoded instructions) - the new SHEMU_OPT_SUPPORT_APX must be set in order to enable APX emulation.

Reduced the size of the INSTRUX structure from 856 bytes to 488 bytes (almost -43%!).
Increased decoding performance from average 300 clocks/instruction to average 235 clocks/instruction (almost +20%!).
New decode options - do not decode implicit operands - this further increases performance from average 235 clocks/instruction to 200 clocks/instruction (almost +15%!).
Re-worked the Python scripts - both disasmlib.py and generate_tables.py have been significantly reworked, improving readability, and making them more efficient.
disasmtool builds on Linux.

Support for Cyrix & VIA instructions - only current Intel & AMD instructions remain supported.
disasmtool_lix has been removed. disasmtool is available on Linux as well.

Removed Iclass field - it was aliased over Instruction field, which must be used from now on.
Removed OperandsEncodingMap field - one can consult the Encoding field in each operand to determine the encoding.
Removed ExceptionClass field - only ExceptionType remains, which contains an enum with all the exception types.
Removed Predicate field - only Condition remains, which was aliased over Predicate.
Removed HasImm3, Immediate3, Imm3Length and Imm3Offset fields, as they were not used/needed.
Removed Bhint, SseCondition, SignDisp fields, as they were not used.
Moved FlagsAccess.RegAccess outside and renamed it to RflAccess, to save more space.
Switched from char Mnemonic[32] to const char *Mnemonic - this decreases INSTRUX size by almost 32 bytes, and increases perf.

Removed RawSize - in most cases, Size and RawSize are identical; the only case where they might differ is for Immediate and RelativeOffset operands - in that case, one can consult the RawSize field in Immediate or RelativeOffset.

Removed Broadcast field, moved it inside ND_OPDESC_MEMORY.
Removed HasSae, HasEr - they are per instruction, not per operand, and can be consulted directly inside INSTRUX.
Moved Msk one level up, inside the ND_OPERAND_DECORATOR structure.