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box64 Box64 - Linux Userspace x86_64 Emulator with a twist, targeted at ARM64, RV64 and LoongArch Linux devices
© 2026 AnnounceHQ. All rights reserved.
v0.3.6 - box64 Release Notes | AnnounceHQ
What's Changed
This version introduces wowbox64.dll for Hangover; the ability to use the Volatile Metadata of Windows executables for x64 wine; and some better x87/SSE/AVX handling
=> WowBox64 can be built directly from Box64 repo, and can be found in the CI artifacts also
=> it also supports a subset of BOX64_XXXX settings, which can be set from command line or via a setting file ".box64rc" in the Wine prefix home
=> Volatile Metadata, when present, allows only applying strong memory ordering when needed, as marked by the compiler, giving overall better performances
=> The precision control bit of x87 is now handled, allowing some older games to run correctly
=> More work has been done in the handling of precise NaN and Round handling in SSE & AVX opcodes
Added/fixed some Syscalls, helping Go programs
Wrapper: more functions added, and some fixes too. Vulkan is 1.4 now, among other things
Wrapper: Added a few more wrapped libs (like some avcodec and friends)
Improve internal memory allocator (with a dedicated allocator for small memory allocations), and fixed some issues around it
Improve internal mmaped file tracking
Box32: Some small refactoring around memory management and internal memory allocations
Box32: More functions wrapped
Box32: More libraries wrapped
ARM64: Added support for Atomic extension in many internal functions (not related to Dynarec).
ARM64: Added support for CRC2 extension for internal CRC functions
Interp: A few fixes to some opcodes, and better NAN handling on some selected SSE/AVX opcodes
Interp: Added a few opcodes with exotic prefixes
Dynarec: Introcude BOX64_DYNAREC_ROUND=2 to handle x87 precision control bit (ARM64 and RV64, LA64 still doesn't handle x87 yet)
Dynarec: Some small optimizations on Strongmem emulation, making it more efficient
Dynarec: Some speed optimizations on code that do SMC and waiting slot
Dynarec: Added CALLRET=2 to improve call/ret optimization compatibility with SMC code
Dynarec: ARM64: Various optimizations and fixes on some opcodes, especially AVX ones
Dynarec: ARM64: Added missing FASTNAN=0 handling on some SSE/AVX opcodes
Dynarec: ARM64: Added some exotic prefixed opcodes
Dynarec: ARM64: Avoid purging XMM/YMM register on intra-block loop if possible
Dynarec: RV64: Many fixes and improvments around x87 emulation
Dynarec: RV64: Added some more missing opcodes, especially some LOCK prefixed ones and many MMX ones
Dynarec: RV64: Various fixes on some existing opcodes
Dynarec: RV64: Improved nativeflags handling, allowing for more cases to use it
Dynarec: LA64: Added some more opcodes and MMX handling
Dynarec: LA64: Various fixes to some existing opcodes
Android: Improved signal handling, structure alignment, and transformation
WowBox64: Created the dll, with RcFile, Env. Var. handling and log printout (both ARM64 Dynarec and Interpreter available)
Cosim: Various fixes and improvements to limit false negatives and improve readability of logs
RcFile: A few fixes for some values that would be ignored
More details in New release blog
Contributors
[WRAPPER] missing functions and features by @airidosas252 in https://github.com/ptitSeb/box64/pull/2434
Bundle more libs by @LukeShortCloud in https://github.com/ptitSeb/box64/pull/2419
[COSIM] Show hex values in STx diff logs by @ksco in https://github.com/ptitSeb/box64/pull/2436
[RV64_DYNAREC] Fixed some x87 rounding cases for fastround=0 by @ksco in https://github.com/ptitSeb/box64/pull/2437
[DOCS] Added ranged gdbjit documentation by @ksco in https://github.com/ptitSeb/box64/pull/2440
[RV64_DYNAREC] Minor x87 changes to enable test31 by @ksco in https://github.com/ptitSeb/box64/pull/2441
[RV64_DYNAREC] Minor D8..DF opcodes refactor by @ksco in https://github.com/ptitSeb/box64/pull/2442
[RV64_DYNAREC] More minor changes and fixes to x87 opcodes by @ksco in https://github.com/ptitSeb/box64/pull/2443
Note about binfmt_misc by @FZXO11 in https://github.com/ptitSeb/box64/pull/2445
[RV64_DYNAREC] Added 66 F0 0F B1 LOCK CMPXCHG opcode by @ksco in https://github.com/ptitSeb/box64/pull/2447
[DYNAREC] Fixed minor issues for F0 0F B0/B1 LOCK CMPXCHG opcodes by @ksco in https://github.com/ptitSeb/box64/pull/2448
[RCFILE] Added profile for HSR Game by @shenmo7192 in https://github.com/ptitSeb/box64/pull/2450
[RV64_DYNAREC] Fixed many minor issues by @ksco in https://github.com/ptitSeb/box64/pull/2451
[RCFILE] Update steamwebhelper profile by @ksco in https://github.com/ptitSeb/box64/pull/2452
Fixed a bug in the wrapper helper due to variadic arguments by @rajdakin in https://github.com/ptitSeb/box64/pull/2455
[RV64_DYNAREC] Fixed some DD prefixed x87 opcodes by @ksco in https://github.com/ptitSeb/box64/pull/2463
[RV64_DYNAREC] Fixed scratch conflicts with fastround=0 in some x87 opcodes by @ksco in https://github.com/ptitSeb/box64/pull/2464
[RV64_DYNAREC] Small optim to vsetvli usage by @ksco in https://github.com/ptitSeb/box64/pull/2465
[RV64_DYNAREC] Fixed D9 E5 FXAM opcode by @ksco in https://github.com/ptitSeb/box64/pull/2466
[RV64_DYNAREC] Minor improvement to DD /7 FNSTSW opcode by @ksco in https://github.com/ptitSeb/box64/pull/2467
[RV64_DYNAREC] Fixed 66 0F 6A PUNPCKHDQ opcodes by @ksco in https://github.com/ptitSeb/box64/pull/2468
[INTERP] Fixed Interpreter to have new test30 running on RISC-V by @ksco in https://github.com/ptitSeb/box64/pull/2470
[LA64_DYNAREC] Added more opcodes by @ksco in https://github.com/ptitSeb/box64/pull/2472
[LA64_DYNAREC] Added more opcodes by @ksco in https://github.com/ptitSeb/box64/pull/2473
[LA64_DYNAREC] Added more opcodes by @ksco in https://github.com/ptitSeb/box64/pull/2475
[LA64_DYNAREC] Added preliminary MMX support by @ksco in https://github.com/ptitSeb/box64/pull/2476
New Contributors
@airidosas252 made their first contribution in https://github.com/ptitSeb/box64/pull/2434
@FZXO11 made their first contribution in https://github.com/ptitSeb/box64/pull/2445
@phorcys made their first contribution in https://github.com/ptitSeb/box64/pull/2489
@kpyrkosz made their first contribution in https://github.com/ptitSeb/box64/pull/2501
@cjy880927 made their first contribution in https://github.com/ptitSeb/box64/pull/2507
Full Changelog : https://github.com/ptitSeb/box64/compare/v0.3.4...v0.3.6
[LA64_DYNAREC] Added more MMX opcodes by @ksco in https://github.com/ptitSeb/box64/pull/2477
[LA64_DYNAREC] Added more MMX opcodes by @ksco in https://github.com/ptitSeb/box64/pull/2479
Some cosmetic changes to C header files by @ksco in https://github.com/ptitSeb/box64/pull/2487
Added os.h for future usage by @ksco in https://github.com/ptitSeb/box64/pull/2488
[LA64_DYNAREC] Fix f0.80.1 LOCK OR, LoongArch ANDI is zero-extended. by @phorcys in https://github.com/ptitSeb/box64/pull/2489
Introduced box64cpu.h for exported interpreter and dynarec functions by @ksco in https://github.com/ptitSeb/box64/pull/2490
Moved more OS-dependent functions to os.h by @ksco in https://github.com/ptitSeb/box64/pull/2491
Moved some emit functions to os.h by @ksco in https://github.com/ptitSeb/box64/pull/2494
[LA64_DYNAREC] Add more sse ops by @phorcys in https://github.com/ptitSeb/box64/pull/2493
[CI] Enable cppThreads_32bits in the CI by @ksco in https://github.com/ptitSeb/box64/pull/2496
Moved more functions to os.h by @ksco in https://github.com/ptitSeb/box64/pull/2497
[INTERP] Fixed a nan propagation issue on RISC-V by @ksco in https://github.com/ptitSeb/box64/pull/2498
Decoupled alternate functions from bridge by @ksco in https://github.com/ptitSeb/box64/pull/2500
[LA64_DYNAREC] Optimize la64 MAXPD/MAXPS. by @phorcys in https://github.com/ptitSeb/box64/pull/2499
Corrected arguments of my_epoll_pwait2 by @kpyrkosz in https://github.com/ptitSeb/box64/pull/2501
Add __localtime64 and __time64 in box32 mode by @kpyrkosz in https://github.com/ptitSeb/box64/pull/2502
[CMAKE]: Fix arm64 build by @cjy880927 in https://github.com/ptitSeb/box64/pull/2507
[WOW64] Add wow64 PE build scaffolding by @ksco in https://github.com/ptitSeb/box64/pull/2513
[ARM64_DYNAREC] Fixed some dangling else warnings by @ksco in https://github.com/ptitSeb/box64/pull/2514
Added backtrace.h for holding backtrace-related functions by @ksco in https://github.com/ptitSeb/box64/pull/2515
Moved emit functions to seperate files from signals.h by @ksco in https://github.com/ptitSeb/box64/pull/2516
Made custommem OS-independent by @ksco in https://github.com/ptitSeb/box64/pull/2517
[WOW64] More work on the PE wow64 build by @ksco in https://github.com/ptitSeb/box64/pull/2518
[WOW64] More tweaks towards PE build by @ksco in https://github.com/ptitSeb/box64/pull/2519
[WOW64] Splitted freq and cleanup functions from x64emu by @ksco in https://github.com/ptitSeb/box64/pull/2521
[LA64_DYNAREC] Update la64 mmx infra. by @phorcys in https://github.com/ptitSeb/box64/pull/2524
[LA64_DYNAREC] Add mmx related mov op by @phorcys in https://github.com/ptitSeb/box64/pull/2526
[LA64_DYNAREC] Optimize sse_setround by @phorcys in https://github.com/ptitSeb/box64/pull/2527
[WOW64] More tweaks for PE build by @ksco in https://github.com/ptitSeb/box64/pull/2528
[LA64_DYNAREC] Add mmx shift ops. by @phorcys in https://github.com/ptitSeb/box64/pull/2529
[LA64_DYNAREC] Add mmx arith ops. by @phorcys in https://github.com/ptitSeb/box64/pull/2530
[RV64_DYNAREC] fix MASKMOVQ by @phorcys in https://github.com/ptitSeb/box64/pull/2531
[WOW64] Added non-functional PE build by @ksco in https://github.com/ptitSeb/box64/pull/2532
[LA64_DYNAREC] Add mmx cmp ops. by @phorcys in https://github.com/ptitSeb/box64/pull/2533
Eliminated many compilation warnings by @ksco in https://github.com/ptitSeb/box64/pull/2535
[WOW64] Added PE build to the build system by @ksco in https://github.com/ptitSeb/box64/pull/2537
[LA64_DYNAREC] Add mmx pack/unpack ops. by @phorcys in https://github.com/ptitSeb/box64/pull/2536
[WOW64] More tweaks to CMake PE build by @ksco in https://github.com/ptitSeb/box64/pull/2541
[LA64_DYNAREC] Add SSE1/SSE2's cvt mmx ops. by @phorcys in https://github.com/ptitSeb/box64/pull/2538
[WOW64] Finished skeleton code for PE build by @ksco in https://github.com/ptitSeb/box64/pull/2542
[LA64_DYNAREC]Add/Fix more SSE/MMX ops by @phorcys in https://github.com/ptitSeb/box64/pull/2543
Merge mmapmem into mapallmem by @devarajabc in https://github.com/ptitSeb/box64/pull/2550
[RV64_DYNAREC] Added X87DOUBLE=2 support by @ksco in https://github.com/ptitSeb/box64/pull/2553
[ENV][COSIM] Enable x87double only if it's off by @ksco in https://github.com/ptitSeb/box64/pull/2554
[RV64_DYNAREC][TRACE][COSIM] Improve x87 fiability in dynarec trace and cosim scenario by @ksco in https://github.com/ptitSeb/box64/pull/2555
[DYNAREC] More handling of low precision x87 flag change by @ksco in https://github.com/ptitSeb/box64/pull/2556
[RV64_DYNAREC] Better handling of x87double=2 by @ksco in https://github.com/ptitSeb/box64/pull/2560
[RBTREE] Cache boundary nodes and remove add_range() by @devarajabc in https://github.com/ptitSeb/box64/pull/2557
[LA64_DYNAREC] Add SSSE3's mmx ops. by @phorcys in https://github.com/ptitSeb/box64/pull/2559
[DYNAREC] Added a x87pc test and some cosmetic changes too by @ksco in https://github.com/ptitSeb/box64/pull/2561
Fixed an edge case in rb_unset by @rajdakin in https://github.com/ptitSeb/box64/pull/2562
Added some missing newlines by @ksco in https://github.com/ptitSeb/box64/pull/2567
[ARM64_DYNAREC] Minor optim to MOVNTDQA by @ksco in https://github.com/ptitSeb/box64/pull/2568
[DYNAREC] Added ranged Dynablock dump by @ksco in https://github.com/ptitSeb/box64/pull/2570
[LA64_DYNAREC] Add POPCNT/TZCNT/LZCNT ops. by @phorcys in https://github.com/ptitSeb/box64/pull/2566
[LA64_DYNAREC] Add/Opt more mmx/sse ops by @phorcys in https://github.com/ptitSeb/box64/pull/2565
[RV64_DYNAREC] Fixed x87 cache swapping by @ksco in https://github.com/ptitSeb/box64/pull/2571
[SIGNAL] Better signal logging when trace enabled by @ksco in https://github.com/ptitSeb/box64/pull/2572
[RV64_DYNAREC] Minor adjustment to dynarec_missing=2 by @ksco in https://github.com/ptitSeb/box64/pull/2578
Show Dynarec architecture in version string by @ksco in https://github.com/ptitSeb/box64/pull/2580
[RV64_DYNAREC] Optimized rv64 printer for pseudo and jump instructions by @ksco in https://github.com/ptitSeb/box64/pull/2581
[RV64_DYNAREC] Small optimization to LEA opcode by @ksco in https://github.com/ptitSeb/box64/pull/2582
[RV64_DYNAREC] Minor optim to 8 bit TEST opcode by @ksco in https://github.com/ptitSeb/box64/pull/2583
Fixed 02423c2 by @rajdakin in https://github.com/ptitSeb/box64/pull/2584
Use setProtection_mmap in NewBrick by @devarajabc in https://github.com/ptitSeb/box64/pull/2599
Added a simple PE loaded dedicated for volatileMetadata by @ksco in https://github.com/ptitSeb/box64/pull/2607
[NON4KPAGE] Fix AllocLoadElfMemory multiblocks wrong alignment (#2608) by @xiangzhai in https://github.com/ptitSeb/box64/pull/2609
[DYNAREC] Use PE volatile metadata in dynarec by @ksco in https://github.com/ptitSeb/box64/pull/2610
[ENV] Refactored file-mapping handling by @ksco in https://github.com/ptitSeb/box64/pull/2612
[GDBJIT] Added a new option to register debuginfo only after trapped into signalhandler by @ksco in https://github.com/ptitSeb/box64/pull/2614
[WOW64] Initial implementation patches by @AndreRH in https://github.com/ptitSeb/box64/pull/2619
[DOCS] Include RV64 and LARCH64 DynaRec options by @devarajabc in https://github.com/ptitSeb/box64/pull/2621
[Docs] Fix the format of Commit 816c4bd by @devarajabc in https://github.com/ptitSeb/box64/pull/2622
[CI] Check WOW64 build in the CI by @ksco in https://github.com/ptitSeb/box64/pull/2623
wow64 part2 (dont squash) by @AndreRH in https://github.com/ptitSeb/box64/pull/2624
[RV64_DYNAREC] Added more mmx opcodes by @ksco in https://github.com/ptitSeb/box64/pull/2626
[RV64_DYNAREC] Added more mmx opcodes by @ksco in https://github.com/ptitSeb/box64/pull/2627
[RV64_DYNAREC] Added more mmx opcodes by @ksco in https://github.com/ptitSeb/box64/pull/2630
[DOCS] improve consistency between documentation and code by @sehraf in https://github.com/ptitSeb/box64/pull/2631
[RV64_DYNAREC] Added more mmx opcodes by @ksco in https://github.com/ptitSeb/box64/pull/2629
[DOCS] Align usage.json and env.h by @ksco in https://github.com/ptitSeb/box64/pull/2633
[RV64_DYNAREC] Fixed a typo introduced lately by @ksco in https://github.com/ptitSeb/box64/pull/2634
[RV64_DYNAREC] Added and optimized some SSE/MMX opcodes by @ksco in https://github.com/ptitSeb/box64/pull/2635
[DYNAREC] More minor changes to missing VEX prefixed opcodes by @ksco in https://github.com/ptitSeb/box64/pull/2636
[RV64_DYNAREC] Added more opcodes for vector by @ksco in https://github.com/ptitSeb/box64/pull/2637
[DYNAREC] Fixed alternate address testing when retrieving dynablock by @ksco in https://github.com/ptitSeb/box64/pull/2638
[RV64_DYNAREC] Added F2 0F F0 LDDQU opcode for vector by @ksco in https://github.com/ptitSeb/box64/pull/2639
[RV64_DYNAREC] Enabled native flags optimization for SETcc opcodes by @ksco in https://github.com/ptitSeb/box64/pull/2640
wow64 part3 (dont squash) by @AndreRH in https://github.com/ptitSeb/box64/pull/2647
[RV64] Improved vendor extension detection to avoid conflicts (for #2645) by @ksco in https://github.com/ptitSeb/box64/pull/2648
[RV64_DYNAREC] Improved POPCNT and fixed some scratch conflicts by @ksco in https://github.com/ptitSeb/box64/pull/2651
[RV64_DYNAREC] Fixed more potential scratch register conflicts by @ksco in https://github.com/ptitSeb/box64/pull/2652
[DYNAREC] Removed unnecessary volatile metadata barriers by @ksco in https://github.com/ptitSeb/box64/pull/2653
[RV64_DYNAREC] Implemented unaligned path for LOCK INC/DEC opcodes by @ksco in https://github.com/ptitSeb/box64/pull/2656
Reprint env configs when special libraries detected by @ksco in https://github.com/ptitSeb/box64/pull/2657
[RV64_DYNAREC] Fixed a typo in 66 F0 0F LOCK CMPXCHG opcode by @ksco in https://github.com/ptitSeb/box64/pull/2658
[RV64_DYNAREC] Enable nativeflags optimization for more patterns by @ksco in https://github.com/ptitSeb/box64/pull/2659
wow64 part4 (dont squash) by @AndreRH in https://github.com/ptitSeb/box64/pull/2660
[CMAKE] Removed the hard dependency between dynarec and main executable to speed up build by @ksco in https://github.com/ptitSeb/box64/pull/2662
Added -k option to kill all box64 instances by @ksco in https://github.com/ptitSeb/box64/pull/2661
[RV64_DYNAREC] Optimized some opcodes with xtheadbb by @ksco in https://github.com/ptitSeb/box64/pull/2663
[RV64_DYNAREC] Optimized CLZ macro with xtheadbb by @ksco in https://github.com/ptitSeb/box64/pull/2664
[RV64_DYNAREC] Improved emit_pf with Zbb by @ksco in https://github.com/ptitSeb/box64/pull/2665
wow64 part5(dont squash) by @AndreRH in https://github.com/ptitSeb/box64/pull/2667
[RV64_DYNAREC] Minor nativeflags optim to LEA and CMOVcc opcodes by @ksco in https://github.com/ptitSeb/box64/pull/2669
[RV64_DYNAREC] Improved ret_to_epilog with xtheadmemidx by @ksco in https://github.com/ptitSeb/box64/pull/2670
[RV64_DYNAREC] Added more opcodes to printer by @ksco in https://github.com/ptitSeb/box64/pull/2671
[CMAKE] Fixed dependency issues introduced recently by @ksco in https://github.com/ptitSeb/box64/pull/2673
[RV64_DYNAREC] Removed useless zero-ups in some emit_* functions by @ksco in https://github.com/ptitSeb/box64/pull/2672
wow64 final (dont squash) by @AndreRH in https://github.com/ptitSeb/box64/pull/2675
[RV64_DYNAREC] Fixed regression introduced in #2669 by @ksco in https://github.com/ptitSeb/box64/pull/2676
[DYNAREC] Fixed expected return address in bridged native call by @ksco in https://github.com/ptitSeb/box64/pull/2677
[ARM64_DYNAREC] Fixed a warning by @ksco in https://github.com/ptitSeb/box64/pull/2678
[WOW64] Supported logging to stdout by @ksco in https://github.com/ptitSeb/box64/pull/2679
[ARM64_DYNAREC] Small optim to modreg CMPXCHG by @ksco in https://github.com/ptitSeb/box64/pull/2680
[WOW64][ENV] Clean up a bit by @ksco in https://github.com/ptitSeb/box64/pull/2681
[WOW64] Added more missing pieces and the interpreter works by @ksco in https://github.com/ptitSeb/box64/pull/2682
[WOW64] Print banner at startup by @ksco in https://github.com/ptitSeb/box64/pull/2685
fix: env BOX64_EMULATED_LIBS triggers sigsegv by @liuli0217 in https://github.com/ptitSeb/box64/pull/2686
[WRAPPER] Implement myStackAlignGVariantNew for g_variant_new by @xiangzhai in https://github.com/ptitSeb/box64/pull/2687
[WOW64] Added support for cosim by @ksco in https://github.com/ptitSeb/box64/pull/2683
[DYNAREC] Ported 37ed49cb to RV64 and LA64 by @ksco in https://github.com/ptitSeb/box64/pull/2690
[DYNAREC] Fixed a prefix typo in dynarec dump by @ksco in https://github.com/ptitSeb/box64/pull/2693
[WOW64] Improved RIP handling on INT n by @ksco in https://github.com/ptitSeb/box64/pull/2692
[CI] Upload libwowbox64.dll to CI artifacts by @ksco in https://github.com/ptitSeb/box64/pull/2696
[WRAPPER] Fixed some xcb-image wrappings by @ksco in https://github.com/ptitSeb/box64/pull/2697
[WOW64] Override DOS stub to Wine builtin DLL by @ksco in https://github.com/ptitSeb/box64/pull/2698
[RBTREE] Update comments on red-black tree usage by @devarajabc in https://github.com/ptitSeb/box64/pull/2694
[WOW64] The name is WowBox64 by @ksco in https://github.com/ptitSeb/box64/pull/2699
[ENV][WOW64] Not every env var applies to WowBox64 by @ksco in https://github.com/ptitSeb/box64/pull/2700
[DOCS] Updated COMPILE.md about WowBox64 by @ksco in https://github.com/ptitSeb/box64/pull/2701
[WOW64] More cleanups and implemented a few more BTCpu functions by @ksco in https://github.com/ptitSeb/box64/pull/2702
[WOW64] Added rcfile support by @ksco in https://github.com/ptitSeb/box64/pull/2708
[WOW64] The official file name is wowbox64.dll by @ksco in https://github.com/ptitSeb/box64/pull/2709