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Linux/arch/arm/nwfpe/ChangeLog

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  1 2003-03-22  Ralph Siemsen <ralphs@netwinder.org>
  2         * Reformat all but softfloat files to get a consistent coding style.
  3           Used "indent -kr -i8 -ts8 -sob -l132 -ss" and a few manual fixups.
  4         * Removed dead code and fixed function protypes to match definitions.
  5         * Consolidated use of (opcode && MASK_ARITHMETIC_OPCODE) >> 20.
  6         * Make 80-bit precision a compile-time option. (1%)
  7         * Only initialize FPE state once in repeat-FP situations. (6%)
  8 
  9 2002-01-19  Russell King <rmk@arm.linux.org.uk>
 10 
 11         * fpa11.h - Add documentation
 12                   - remove userRegisters pointer from this structure.
 13                   - add new method to obtain integer register values.
 14         * softfloat.c - Remove float128
 15         * softfloat.h - Remove float128
 16         * softfloat-specialize - Remove float128
 17 
 18         * The FPA11 structure is not a kernel-specific data structure.
 19           It is used by users of ptrace to examine the values of the
 20           floating point registers.  Therefore, any changes to the
 21           FPA11 structure (size or position of elements contained
 22           within) have to be well thought out.
 23 
 24         * Since 128-bit float requires the FPA11 structure to change
 25           size, it has been removed.  128-bit float is currently unused,
 26           and needs various things to be re-worked so that we won't
 27           overflow the available space in the task structure.
 28 
 29         * The changes are designed to break any patch that goes on top
 30           of this code, so that the authors properly review their changes.
 31 
 32 1999-08-19  Scott Bambrough  <scottb@netwinder.org>
 33 
 34         * fpmodule.c - Changed version number to 0.95
 35         * fpa11.h - modified FPA11, FPREG structures
 36         * fpa11.c - Changes due to FPA11, FPREG structure alterations.
 37         * fpa11_cpdo.c - Changes due to FPA11, FPREG structure alterations.
 38         * fpa11_cpdt.c - Changes due to FPA11, FPREG structure alterations.
 39         * fpa11_cprt.c - Changes due to FPA11, FPREG structure alterations.
 40         * single_cpdo.c - Changes due to FPA11, FPREG structure alterations.
 41         * double_cpdo.c - Changes due to FPA11, FPREG structure alterations.
 42         * extended_cpdo.c - Changes due to FPA11, FPREG structure alterations.
 43 
 44         * I discovered several bugs.  First and worst is that the kernel
 45           passes in a pointer to the FPE's state area.  This is defined
 46           as a struct user_fp (see user.h).  This pointer was cast to a
 47           FPA11*.  Unfortunately FPA11 and user_fp are of different sizes;
 48           user_fp is smaller.  This meant that the FPE scribbled on things
 49           below its area, which is bad, as the area is in the thread_struct
 50           embedded in the process task structure.  Thus we were scribbling
 51           over one of the most important structures in the entire OS.
 52 
 53         * user_fp and FPA11 have now been harmonized.  Most of the changes
 54           in the above code were dereferencing problems due to moving the
 55           register type out of FPREG, and getting rid of the union variable
 56           fpvalue.
 57 
 58         * Second I noticed resetFPA11 was not always being called for a
 59           task.  This should happen on the first floating point exception
 60           that occurs.  It is controlled by init_flag in FPA11.  The
 61           comment in the code beside init_flag state the kernel guarantees
 62           this to be zero.  Not so.  I found that the kernel recycles task
 63           structures, and that recycled ones may not have init_flag zeroed.
 64           I couldn't even find anything that guarantees it is zeroed when
 65           when the task structure is initially allocated.  In any case
 66           I now initialize the entire FPE state in the thread structure to
 67           zero when allocated and recycled.  See alloc_task_struct() and
 68           flush_thread() in arch/arm/process.c.  The change to
 69           alloc_task_struct() may not be necessary, but I left it in for
 70           completeness (better safe than sorry).
 71 
 72 1998-11-23  Scott Bambrough  <scottb@netwinder.org>
 73 
 74         * README.FPE - fix typo in description of lfm/sfm instructions
 75         * NOTES - Added file to describe known bugs/problems
 76         * fpmodule.c - Changed version number to 0.94
 77 
 78 1998-11-20  Scott Bambrough  <scottb@netwinder.org>
 79 
 80         * README.FPE - fix description of URD, NRM instructions
 81         * TODO - remove URD, NRM instructions from TODO list
 82         * single_cpdo.c - implement URD, NRM
 83         * double_cpdo.c - implement URD, NRM
 84         * extended_cpdo.c - implement URD, NRM
 85 
 86 1998-11-19  Scott Bambrough  <scottb@netwinder.org>
 87 
 88         * ChangeLog - Added this file to track changes made.
 89         * fpa11.c - added code to initialize register types to typeNone
 90         * fpa11_cpdt.c - fixed bug in storeExtended (typeExtended changed to
 91           typeDouble in switch statement)

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