handling 64-bit windows app system calls

[derekbruening]

From bruen...@google.com on July 19, 2012 14:10:48

should be able to just use the wow64 #s but may want to verify there are no
differences in args that the wow64 marshaling hides

note that:

• XXX: imm32 on x64 seems to have a complete set of user32 wrappers!
• for now not looking at x64 imm32 but may need to eventually do automated
• cross-dll de-duplication.

Original issue: http://code.google.com/p/drmemory/issues/detail?id=945

[derekbruening]

From bruen...@google.com on July 23, 2012 07:12:20

one issue is that my syscall tables store the arg count as a size on the
stack, but on x64 the pointers are larger and the calling convention is
different. for short-term the code should be changed to divide by 4, not
sizeof(reg_t), to get the count.

[derekbruening]

From bruen...@google.com on February 17, 2013 10:20:50

the arg count was fixed in r1020 . that just leaves "verify there are no
differences in args that the wow64 marshaling hides", and imm32.

[derekbruening]

From bruen...@google.com on September 18, 2014 07:41:35

Issue 919 has been merged into this issue.