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author | Christoph Müllner <christoph.muellner@vrull.eu> | 2022-06-28 17:43:20 +0200 |
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committer | Philipp Tomsich <philipp.tomsich@vrull.eu> | 2022-09-22 18:06:09 +0200 |
commit | a9ba8bc2d396fb8ae2b892f3bc6be8cdfe4b555c (patch) | |
tree | 2f67d6d6a2d2254ea43a2d3a0956903eb28b7fde /gas/doc | |
parent | fb1737381d886c7c0a4e870af078c473ac463fce (diff) | |
download | gdb-a9ba8bc2d396fb8ae2b892f3bc6be8cdfe4b555c.zip gdb-a9ba8bc2d396fb8ae2b892f3bc6be8cdfe4b555c.tar.gz gdb-a9ba8bc2d396fb8ae2b892f3bc6be8cdfe4b555c.tar.bz2 |
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>
Diffstat (limited to 'gas/doc')
-rw-r--r-- | gas/doc/c-riscv.texi | 4 |
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 |