From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- arch/arm/nwfpe/ChangeLog | 91 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 91 insertions(+) create mode 100644 arch/arm/nwfpe/ChangeLog (limited to 'arch/arm/nwfpe/ChangeLog') diff --git a/arch/arm/nwfpe/ChangeLog b/arch/arm/nwfpe/ChangeLog new file mode 100644 index 0000000..eeb5a7c --- /dev/null +++ b/arch/arm/nwfpe/ChangeLog @@ -0,0 +1,91 @@ +2003-03-22 Ralph Siemsen + * 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 + + * 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 + + * 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 + + * 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 + + * 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 + + * 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) -- cgit v1.1