RISC-V: Add T-Head CMO vendor extension

T-Head has a range of vendor-specific instructions.
Therefore it makes sense to group them into smaller chunks
in form of vendor extensions.

This patch adds the XTheadCmo extension, a collection of T-Head specific
cache management operations.
The 'th' prefix and the "XTheadCmo" extension are documented in a PR
for the RISC-V toolchain conventions ([1]).

In total XTheadCmo introduces the following 21 instructions:

* DCACHE.{C,CI,I}ALL
* DCACHE.{C,CI,I}{PA,VA,SW} rs1
* DCACHE.C{PAL1,VAL1} rs1
* ICACHE.I{ALL,ALLS}
* ICACHE.I{PA,VA} rs1
* L2CACHE.{C,CI,I}ALL

Contrary to Zicbom, the XTheadCmo instructions don't have a constant
displacement, therefore we have a different syntax for the arguments.
To clarify this is intended behaviour, there is a set of negative test
for Zicbom-style arguments in x-thead-cmo-fail.s.

[1] https://github.com/riscv-non-isa/riscv-toolchain-conventions/pull/19

v2:
- Add missing DECLARE_INSN() list
- Fix ordering

Co-developed-by: Lifang Xia <lifang_xia@linux.alibaba.com>
Signed-off-by: Christoph Müllner <christoph.muellner@vrull.eu>

1 files changed, 4 insertions, 0 deletions

diff --git a/gas/doc/c-riscv.texi b/gas/doc/c-riscv.texi
index 30afd20..10e9429 100644
--- a/gas/doc/c-riscv.texi
+++ b/gas/doc/c-riscv.texi
@@ -704,5 +704,9 @@ extensions supported and provides the location of their
 publicly-released documentation:
 
 @table @r
+@item XTheadCmo
+The XTheadCmo extension provides instructions for cache management.
+
+It is documented in @url{https://github.com/T-head-Semi/thead-extension-spec/releases/download/2.0.0/xthead-2022-09-05-2.0.0.pdf}.
 
 @end table