ppc64 XER potentially ignored/not setting

[Kyle Lehman]

Hello all,

I work with the libre-soc team in the testing area.  Recently I have 
started on writing an interface that uses qemu as another means to 
verify our results from our own simulations against qemu.

The basic workflow I have set up is:

1. Take a test (which are usually one or two instructions, along with a 
supplied list of registers)

2. Compile it as a bin (no loader, nothing but the compiled 
instructions), launch qemu along with gdb, set registers, PC, etc. via gdb

3. Step the instructions, extract registers with gdb and compare them to 
our own results

This works fairly well for int registers and from what I can tell so far 
the CR.  However, and I must apologize if this is somewhat beyond the 
scope of what qemu can do since I'm basically treating it as a finite 
state machine for this...on tests that use or would cause a change in 
the XER: so, ca, ov are ignored.

Launching as (built from latest master):
qemu-system-ppc64 -machine powernv9 -cpu power9 -nographic -s -S -m 
size=1024 -kernel test_path.bin

Instruction of test:
sraw 3, 1, 2      : 7c 23 16 30 (big endian)
r1 = 0x82345678
r2 = 8

Upon execution r3 is set correctly to 0xffffffffff823456, however ca is 
not set within the XER when it should be.

There is another test that is a little more involved, which will 
actually use the XER only *if* I execute the instruction twice by 
setting the PC back to it again.  I can provide that if needed.

Regards,
Kyle