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8b78d81440
- 68040 form of PTEST fixed and handled (previously didn’t decode correctly) - Fixed PFLUSH decoding so incorrect F-line traps don't occur - Indirect page descriptors write back U/M bits properly instead of potentially corrupting the page table - Reset now properly clears ITTx/DTTx - MMUSR now shown in the debugger to help track failed translations - PFLUSH on 68881/68030 now properly compare the ATC tag - Fixed typo causing misinterpretation of long-format descriptors - Indirect descriptors now are handled properly - PTEST on 68881/68030 properly handles levels shallower than the table depth - PMOVE to TTx now properly flushes the ATC - TC consistency check no longer throws exceptions on valid TC values with junk in the TI fields - MMU EA decoding now only accepts forms the real MMUs do - Added some guards against invalid page tables M68k: FPU fixes and updates [R. Belmont] - FPU opcode now validated before doing any EA calculations - 68040-specific FSxxx/FDxxx instructions implemented - 68881 transcendentals implemented and verified M68k: cycle counting overhauled for 68030 and 68040. Timings are significantly better but still inaccurate, especially on 68040. [R. Belmont] 3rdparty/softfloat3: Fixed several errors in the transcendental helpers, including wrong parameter order [R. Belmont] AI disclosure: MMU and FPU debug/tracing and fix planning assisted by Claude Fable 5. Cycle count refactor assisted by GPT 5.6 Terra. Testing: A/UX 3.1.1 now boots properly on a range of 68030 and 68040 machines (with some driver changes not included here). It previously was impossible to boot on 68040. A generated Lua boot script hijacked 68030 and 68040 Macs to run a variety of synthetic FPU and MMU tests. Tested taitojc, Marathon, Wolfenstein 3D, and Jigsaw Puzzle on Mac OS. Tested NeXTSTEP on 68030 and 68040. Tested HP/UX m68k. Tested funkball on x86 to verify x87 is unhurt by the softfloat3 helper fixes.
Package Overview for Berkeley SoftFloat Release 3e
John R. Hauser
2018 January 20
Berkeley SoftFloat is a software implementation of binary floating-point
that conforms to the IEEE Standard for Floating-Point Arithmetic. SoftFloat
is distributed in the form of C source code. Building the SoftFloat sources
generates a library file (typically "softfloat.a" or "libsoftfloat.a")
containing the floating-point subroutines.
The SoftFloat package is documented in the following files in the "doc"
subdirectory:
SoftFloat.html Documentation for using the SoftFloat functions.
SoftFloat-source.html Documentation for building SoftFloat.
SoftFloat-history.html History of the major changes to SoftFloat.
Other files in the package comprise the source code for SoftFloat.