Fixes the register definitions so that instruction skip works.
Both Basilisk II and SheepShaver now work (without JIT) on
Solaris-based OSes such as OpenIndiana.
OpenIndiana/illumos is based on OpenSolaris 10 and
uses the Solaris code paths.
Current status:
Basilisk II: Working but cannot ignore illegal instructions
SheepShaver: Doesn't compile because of same problem
If the SIGSEGV skip instruction handler were fixed, both
programs would likely work.
ucontext_t is what POSIX requires; glibc no longer provides struct
ucontext as of 2.26: https://sourceware.org/glibc/wiki/Release/2.26
(Most architectures were already using ucontext_t, so this also makes
things more consistent; only arm and mips change.)
SDL 1.x is used for display, rather than Mac OS X specific backend. If time permits, I'll port it to SDL 2, if only to reduce Basilisk's overall code foot-print.
Lots of features are apt to be disabled, as many 'dummy' backends were used.
Video-depths other than 1-bit or 32-bit are untested, and in some cases (4-bit, at least) are currently non-functional. This is due to a partial re-write of the SDL backend's blitting code, which was non-functional when low-bit-depths were used.
The SDL backend was also rewired, on OSX, to not attempt to align the display buffer on page-boundaries. So far, this doesn't seem to cause any notice-able problems, however, that's only using limited knowledge and testing (System 7.5.x does boot and display at 640x480, though!). The original display-buffer allocation code was failing to run, in some cases.
Preferences are, on Mac, currently hardcoded to be accessed at /tmp/BasiliskII/BasiliskII_Prefs. The folder, "/tmp/BasiliskII/", may be a symbolic link to elsewhere, though.
