support ymm fields in windows CONTEXT and linux signal structures

From bruen...@google.com on April 20, 2011 11:16:25

split from issue #433 (closed) ymm fields in CONTEXT: several places in the code that save/restore/copy state need to be updated to include ymm state, and many other places need CONTEXT struct to be extended.

from context_to_mcontext(): /* FIXME issue #433 (closed): ymm are inside XSTATE cstruct which should be

• laid out like this: {CONTEXT, CONTEXT_EX, XSTATE}, but
• should read CONTEXT_EX fields to verify.
• All of our CONTEXT structs need to be extended to get
• the extra state.
• XSTATE has xsave format minus first 512 bytes, so ymm0 should
• be at offset 64, but should use LocateXStateFeature() to locate,
• or cpuid to find Ext_Save_Area_2.
• Should be able to eliminate the xmm memcpy calls above and
• replace with a single memcpy here. */

Original issue: http://code.google.com/p/dynamorio/issues/detail?id=437