| 2003-03-22 Ralph Siemsen <ralphs@netwinder.org> | |
| * Reformat all but softfloat files to get a consistent coding style. | |
| Used "indent -kr -i8 -ts8 -sob -l132 -ss" and a few manual fixups. | |
| * Removed dead code and fixed function protypes to match definitions. | |
| * Consolidated use of (opcode && MASK_ARITHMETIC_OPCODE) >> 20. | |
| * Make 80-bit precision a compile-time option. (1%) | |
| * Only initialize FPE state once in repeat-FP situations. (6%) | |
| 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) |