/[gxemul]/trunk/RELEASE

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-revision 28 by dpavlin,
Mon Oct  8 16:20:26 2007 UTC
+revision 36 by dpavlin,
Mon Oct  8 16:21:34 2007 UTC
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- Release notes for Gavare's eXperimental Emulator (GXemul), 0.4.1
+ Release notes for Gavare's eXperimental Emulator (GXemul), 0.4.4.1
- ================================================================
+ ==================================================================
- Copyright (C) 2003-2006  Anders Gavare.
+ Copyright (C) 2003-2007  Anders Gavare.
  GXemul is an experimental instruction-level machine emulator. Several
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 emulation modes are available. In some m
  hardware components are emulated well enough to let unmodified operating
  systems (e.g. NetBSD) run as if they were running on a real machine.
+ Processors (ARM, MIPS, PowerPC, SuperH) are emulated using dynamic
+ translation. Unlike some other dynamically translating emulators, GXemul
+ does not need to generate native code, only a "runnable intermediate
+ representation", and will thus run on any host architecture.
  The documentation lists the machines and guest operating systems that can
  be regarded as "working" in GXemul. The best working guest operating
- systems are probably NetBSD/pmax, NetBSD/cats, and OpenBSD/cats.
+ systems are probably NetBSD/pmax and NetBSD/cats.
- Changes between release 0.4.0.1 and 0.4.1 include, among other things:
-     o)  Some bugs in the dynamic translation core have been fixed, making
-         all emulation modes (especially the MIPS mode) more stable.
-     o)  In the refactoring effort between 0.4.0 and 0.4.0.1, single-stepping
+ Changes between release 0.4.3 and 0.4.4.1 include, among other things:
-         (and instruction tracing) of 64-bit programs was accidentally broken.
-         Single-stepping in 64-bit mode could result in strange exceptions.
-         This has been fixed in 0.4.1.
-     o)  MIPS emulation performance has been improved somewhat:
+     o)  The interrupt subsystem has been redesigned. This means two things:
-         R3000: After removing some buggy code (hints for physical page
+           x)  Internal code cleanup, which makes the whole emulator more
-         translations), it was possible to remove the workaround for R3000
+               maintainable. Instead of using magically encoded integers
-         caches which was needed in 0.4.0.1 to make Linux and Ultrix run.
+               for interrupts, strings are now used. These strings are in
-         This gives an overall speedup for R2000/R3000.
+               the form of "paths", so that devices and busses can more
+               easily be connected to other busses, devices, or CPUs.
-         For non-R3000, there have been some speedups as well. After fixing
+           x)  Some machine types which happened to work in release 0.4.3,
-         reference count bugs for 64-bit addressing in the dyntrans system,
+               but were not listed in the documentation as working, may
-         workarounds/hacks in the tlbwr/tlbwi instructions and in the ASID
+               have stopped working now. As always, the documentation should
-         change helper function could be removed.
+               indicate the combinations of machine modes and guest OSes that
+               are supposed to work.
-     o)  A new -s command line option is now available, for dumping
+     o)  SuperH (SH4) emulation is now somewhat more stable.
-         raw runtime data/statistics on every instruction to a file.
-         Currently, the following kinds of data can be dumped:
+           x)  GXemul 0.4.4:    A NetBSD/dreamcast Live CD works.
+           x)  GXemul 0.4.4.1:  A Linux/dreamcast Live CD also works.
-. the program counter (virtual address)
+     o)  PowerPC "G4" emulation is now stable enough to let NetBSD/macppc
-. the physical address representation of the program counter
+         run from a disk image. (Installing actually worked before, but the
-. the internal dyntrans instruction call pointer, useful when
+         NetBSD/macppc GENERIC kernel uses AltiVec instructions which were
-            developing/optimizing the emulator
+         not implemented correctly.)
-         This data can then be analyzed by external tools.
+     o)  The PICA-61 (arc) and i80321 (evbarm) emulation modes now have their
+         timers fixed at 100 Hz. A hardcoded speed like this is very ugly, but
-         (There was a -s command line option in previous releases of
+         it is at least better than before (when the timer wasn't really
-         the emulator, but it did not work as intended, and was not
+         running at any specific speed at all).
-         usable from dyntrans emulation modes.)
  Please read the HISTORY files for more details.
-Line 149 
 them like this is in order:
+Line 147 
 them like this is in order:
      This product includes software developed by Ichiro FUKUHARA.
+     This product includes software developed by Marcus Comstedt.
  Also, src/include/alpha_rpb.h requires the following:
      Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
 Line 166 
 See individual files for license details
  or reuse code.
- Thanks to (in no specific order) Joachim Buss, Olivier Houchard, Juli Mallett,
- Juan Romero Pardines, Alec Voropay, G�ran Weinholt, Alexander Yurchenko, and
- everyone else who has provided me with feedback.
  If you have found GXemul useful in some way, or feel like sending me comments
  or feedback in general, then mail me at anders(at)gavare.se.

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