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-2002-01-19 Russell King <rmk@arm.linux.org.uk>
-
- * fpa11.h - Add documentation
- - remove userRegisters pointer from this structure.
- - add new method to obtain integer register values.
- * softfloat.c - Remove float128
- * softfloat.h - Remove float128
- * softfloat-specialize - Remove float128
-
- * The FPA11 structure is not a kernel-specific data structure.
- It is used by users of ptrace to examine the values of the
- floating point registers. Therefore, any changes to the
- FPA11 structure (size or position of elements contained
- within) have to be well thought out.
-
- * Since 128-bit float requires the FPA11 structure to change
- size, it has been removed. 128-bit float is currently unused,
- and needs various things to be re-worked so that we won't
- overflow the available space in the task structure.
-
- * The changes are designed to break any patch that goes on top
- of this code, so that the authors properly review their changes.
-
-1999-08-19 Scott Bambrough <scottb@netwinder.org>
-
- * fpmodule.c - Changed version number to 0.95
- * fpa11.h - modified FPA11, FPREG structures
- * fpa11.c - Changes due to FPA11, FPREG structure alterations.
- * fpa11_cpdo.c - Changes due to FPA11, FPREG structure alterations.
- * fpa11_cpdt.c - Changes due to FPA11, FPREG structure alterations.
- * fpa11_cprt.c - Changes due to FPA11, FPREG structure alterations.
- * single_cpdo.c - Changes due to FPA11, FPREG structure alterations.
- * double_cpdo.c - Changes due to FPA11, FPREG structure alterations.
- * extended_cpdo.c - Changes due to FPA11, FPREG structure alterations.
-
- * I discovered several bugs. First and worst is that the kernel
- passes in a pointer to the FPE's state area. This is defined
- as a struct user_fp (see user.h). This pointer was cast to a
- FPA11*. Unfortunately FPA11 and user_fp are of different sizes;
- user_fp is smaller. This meant that the FPE scribbled on things
- below its area, which is bad, as the area is in the thread_struct
- embedded in the process task structure. Thus we were scribbling
- over one of the most important structures in the entire OS.
-
- * user_fp and FPA11 have now been harmonized. Most of the changes
- in the above code were dereferencing problems due to moving the
- register type out of FPREG, and getting rid of the union variable
- fpvalue.
-
- * Second I noticed resetFPA11 was not always being called for a
- task. This should happen on the first floating point exception
- that occurs. It is controlled by init_flag in FPA11. The
- comment in the code beside init_flag state the kernel guarantees
- this to be zero. Not so. I found that the kernel recycles task
- structures, and that recycled ones may not have init_flag zeroed.
- I couldn't even find anything that guarantees it is zeroed when
- when the task structure is initially allocated. In any case
- I now initialize the entire FPE state in the thread structure to
- zero when allocated and recycled. See alloc_task_struct() and
- flush_thread() in arch/arm/process.c. The change to
- alloc_task_struct() may not be necessary, but I left it in for
- completeness (better safe than sorry).
-
-1998-11-23 Scott Bambrough <scottb@netwinder.org>
-
- * README.FPE - fix typo in description of lfm/sfm instructions
- * NOTES - Added file to describe known bugs/problems
- * fpmodule.c - Changed version number to 0.94
-
-1998-11-20 Scott Bambrough <scottb@netwinder.org>
-
- * README.FPE - fix description of URD, NRM instructions
- * TODO - remove URD, NRM instructions from TODO list
- * single_cpdo.c - implement URD, NRM
- * double_cpdo.c - implement URD, NRM
- * extended_cpdo.c - implement URD, NRM
-
-1998-11-19 Scott Bambrough <scottb@netwinder.org>
-
- * ChangeLog - Added this file to track changes made.
- * fpa11.c - added code to initialize register types to typeNone
- * fpa11_cpdt.c - fixed bug in storeExtended (typeExtended changed to
- typeDouble in switch statement)