commit a3652b17bebe03d32e1a07a2d018c01ccaac7d32
author Paul E. Murphy <murp@ibm.com> Wed Dec 09 10:16:11 2020 -0600
committer Lynn Boger <laboger@linux.vnet.ibm.com> Mon Feb 22 21:50:09 2021 +0000
tree 9dd32ed0230be5cfdf97f2e7a22705dc6517d803
parent d79151a12d1b87841233cd5bc04de4e0fd10314d

ppc64asm,ppc64map: improve gnu branch decoding, and other misc

Rewrite the branch decoding to be more consistent with objdump.
Comments are taken from ISA 3.1 sections on the BO field (book i, 2.4),
and Appendix C.2 for extended branch mnemonics.  Also, generate all
interesting cases to verify.  Interesting cases are those which
don't choke objdump (e.g not setting z bits in BO, or setting at to
0b01).

Likewise, fixup handling of mtfs* instructions.  The field names are
similar to condition registers, but these operate on FPSCR bits and
fields.  Decode them as immediates, similar to objdump.

Likewise, when printing CR bits, use gnu/ISA syntax of 4*crN+B when
N > 0, and B is a named CR bit.

Likewise, when running testcode, track the "PC".  This keeps the
generated tests working without hacks.  This requires fixing up
some offsets in the handwritten tests.  Similarly, allow testing
of multiple files in the test directory which are prefixed with
"decode".

Likewise, allow appropriately prefixed to run these tests too.  This
allows running tests on non-native systems (e.g with IBM's advance
toolchain on an x86 host).

Change-Id: I1d6b2fc78a22a182524fdec596f05a10d25363c5
Reviewed-on: https://go-review.googlesource.com/c/arch/+/293270
Trust: Carlos Eduardo Seo <carlos.seo@linaro.org>
Run-TryBot: Carlos Eduardo Seo <carlos.seo@linaro.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>