Commit Graph

5 Commits

Author SHA1 Message Date
Stanislav Shwartsman
f9bd2b74be 1. Fixed bug in FSUB instruction
2. Fixed bug

[ 989478 ] I-Cache and undefined Instruktions

The L4 microkernel uses an undefined instruction to
trap for a special requests into the kernel (LOCK NOP).
The handler fixes this up and gives the user a special
code page with syscall stubs. If you're not using the
I-Cache optimization everthing works find on bochs. But
if you enable the I-Cache (--enable-icache), then the
undefined opcode exception is thrown only once for ever
virtual address it occurs. See the demodisk of the
L4KA::pistachio
(http://www.l4ka.org/projects/pistachio/download.php).
In this case the pingpong benchmark of this demo is of
interest. Everything runs fine until the program tries
to spawn a new task for its measurements. This new task
shares the code of the creating program. But the new
task stops executing at the undefined instruction
explained above and no exception is thrown.
2004-07-29 20:15:19 +00:00
Stanislav Shwartsman
50aaf8ec6f Implemented FFREEP 287+ compatability instruction 2004-07-15 19:45:33 +00:00
Stanislav Shwartsman
5c5b556f24 Merge softfloat-fpu-implementation_ver4_branch branch 2004-06-18 14:11:11 +00:00
Stanislav Shwartsman
a8b57836a2 all these files should be in branch only for now 2004-04-09 12:52:49 +00:00
Stanislav Shwartsman
04124133c0 freeze softfloat-fpu-ver3 branhc and open it for free testing
I will continue the development in new softfloat-fpu-ver4 branch
Current version already implements ALL FPU instructions except
   FSIN, FCOS, FSINCOS, FPTAN, FPATAN, FYL2XP1, F2XM1, FYL2X
I think it solved all currently reported bugs and feature requests
related to FPU code.
Please write your own test programms and test the implemntation in all ways you can.
Thanks,
Stanislav
2004-04-09 12:29:50 +00:00