ARM Architecture Reference Manual ARMv7-A and ARMv7-R edition

Appendix B
Common VFP Subarchitecture Specification
This appendix describes version 2 of the Common VFP subarchitecture. It contains the following sections:
Scope of this appendix on page AppxB-2
Introduction to the Common VFP subarchitecture on page AppxB-3
Exception processing on page AppxB-6
Support code requirements on page AppxB-11
Context switching on page AppxB-14
Subarchitecture additions to the VFP system registers on page AppxB-15
Version 1 of the Common VFP subarchitecture on page AppxB-23.
Note
This VFP subarchitecture specification is not part of the ARM architecture specification. Implementers and
users of the ARMv7 architecture must not consider this appendix as a requirement of the architecture. It is
included as an appendix to this manual only:
as reference material for users of ARM VFP products that implement this subarchitecture
as an example of how a VFP subarchitecture might be implemented.
The inclusion of this appendix is no indication of whether any ARMv7 VFP implementations by ARM
might, or might not, implement this Common VFP subarchitecture. For details of the implemented VFP
subarchitecture you must always see the appropriate product documentation.
ARM DDI 0406B Copyright © 1996-1998, 2000, 2004-2008 ARM Limited. All rights reserved. AppxB-1