[binutils-gdb] RISC-V: Add generic support for vendor extensions

[Philipp Tomsich <ptomsich@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=fb1737381d886c7c0a4e870af078c473ac463fce

commit fb1737381d886c7c0a4e870af078c473ac463fce
Author: Christoph Müllner <christoph.muellner@vrull.eu>
Date:   Tue Jun 28 17:42:58 2022 +0200

    RISC-V: Add generic support for vendor extensions
    
    This patch introduces changes that allow the integration of vendor ISA
    extensions:
    * Define a list of vendor extensions (riscv_supported_vendor_x_ext)
      where vendor extensions can be added
    * Introduce a section with a table in the documentation where vendor
      extensions can be added
    
    To add a vendor extension that consists of instructions only,
    the following things need to be done:
    * Add the extension to the riscv_supported_vendor_x_ext list
    * Add lookup entry in riscv_multi_subset_supports
    * Documenting the extension in c-riscv.texti
    * Add test cases for all instructions
    * Add MATCH*/MASK* constants and DECLARE_INSN() for all instructions
    * Add new instruction class to enum riscv_insn_class
    * Define the instructions in riscv_opcodes
    * Additional changes if necessary (depending on the instructions)
    
    Co-developed-by: Lifang Xia <lifang_xia@linux.alibaba.com>
    Signed-off-by: Christoph Müllner <christoph.muellner@vrull.eu>

Diff:
---
 bfd/elfxx-riscv.c    |  9 +++++++--
 gas/doc/c-riscv.texi | 14 ++++++++++++++
 2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/bfd/elfxx-riscv.c b/bfd/elfxx-riscv.c
index 7eda177bd6e..cb3a980936d 100644
--- a/bfd/elfxx-riscv.c
+++ b/bfd/elfxx-riscv.c
@@ -1222,12 +1222,18 @@ static struct riscv_supported_ext riscv_supported_std_zxm_ext[] =
   {NULL, 0, 0, 0, 0}
 };
 
+static struct riscv_supported_ext riscv_supported_vendor_x_ext[] =
+{
+  {NULL, 0, 0, 0, 0}
+};
+
 const struct riscv_supported_ext *riscv_all_supported_ext[] =
 {
   riscv_supported_std_ext,
   riscv_supported_std_z_ext,
   riscv_supported_std_s_ext,
   riscv_supported_std_zxm_ext,
+  riscv_supported_vendor_x_ext,
   NULL
 };
 
@@ -1483,8 +1489,7 @@ riscv_get_default_ext_version (enum riscv_spec_class *default_isa_spec,
     case RV_ISA_CLASS_ZXM: table = riscv_supported_std_zxm_ext; break;
     case RV_ISA_CLASS_Z: table = riscv_supported_std_z_ext; break;
     case RV_ISA_CLASS_S: table = riscv_supported_std_s_ext; break;
-    case RV_ISA_CLASS_X:
-      break;
+    case RV_ISA_CLASS_X: table = riscv_supported_vendor_x_ext; break;
     default:
       table = riscv_supported_std_ext;
     }
diff --git a/gas/doc/c-riscv.texi b/gas/doc/c-riscv.texi
index 21d867e9cf0..30afd200b7d 100644
--- a/gas/doc/c-riscv.texi
+++ b/gas/doc/c-riscv.texi
@@ -20,6 +20,7 @@
 * RISC-V-Modifiers::      RISC-V Assembler Modifiers
 * RISC-V-Formats::        RISC-V Instruction Formats
 * RISC-V-ATTRIBUTE::      RISC-V Object Attribute
+* RISC-V-CustomExts::     RISC-V Custom (Vendor-Defined) Extensions
 @end menu
 
 @node RISC-V-Options
@@ -692,3 +693,16 @@ the privileged specification.  It will report errors if object files of
 different privileged specification versions are merged.
 
 @end table
+
+@node RISC-V-CustomExts
+@section RISC-V Custom (Vendor-Defined) Extensions
+@cindex custom (vendor-defined) extensions, RISC-V
+@cindex RISC-V custom (vendor-defined) extensions
+
+The following table lists the custom (vendor-defined) RISC-V
+extensions supported and provides the location of their
+publicly-released documentation:
+
+@table @r
+
+@end table