[PATCH] RISC-V: Support Svrsw60t59b extension.

[Jiawei]

This patch adds RISC-V Svrsw60t59b extension minimal support.

https://github.com/riscv/riscv-isa-manual/blob/f30292bb486d735e186f06f705fcd7beff1e3e97/src/supervisor.adoc#L2550

bfd/ChangeLog:

	* elfxx-riscv.c: New ext.

gas/ChangeLog:

	* NEWS: New ext.
	* testsuite/gas/riscv/march-help.l: Ditto.

---
 bfd/elfxx-riscv.c                    | 1 +
 gas/NEWS                             | 2 +-
 gas/testsuite/gas/riscv/march-help.l | 1 +
 3 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/bfd/elfxx-riscv.c b/bfd/elfxx-riscv.c
index ee962b4f6f1..a206dc73e4c 100644
--- a/bfd/elfxx-riscv.c
+++ b/bfd/elfxx-riscv.c
@@ -1595,6 +1595,7 @@ static const struct riscv_supported_ext riscv_supported_std_s_ext[] =
   {"svinval",		ISA_SPEC_CLASS_DRAFT,		1, 0, 0 },
   {"svnapot",		ISA_SPEC_CLASS_DRAFT,		1, 0, 0 },
   {"svpbmt",		ISA_SPEC_CLASS_DRAFT,		1, 0, 0 },
+  {"svrsw60t59b",		ISA_SPEC_CLASS_DRAFT,		1, 0, 0 },
   {"svvptc",		ISA_SPEC_CLASS_DRAFT,		1, 0, 0 },
   {"ssqosid",		ISA_SPEC_CLASS_DRAFT,		1, 0, 0 },
   {"ssnpm",		ISA_SPEC_CLASS_DRAFT,		1, 0, 0 },
diff --git a/gas/NEWS b/gas/NEWS
index e384d1135c0..4536e4b3e83 100644
--- a/gas/NEWS
+++ b/gas/NEWS
@@ -15,7 +15,7 @@ Changes in 2.46:
 * Solaris/PowerPC target support is removed.
 
 * Add support for RISC-V standard extensions:
-  sdtrig v1.0, ssstrict v1.0.
+  sdtrig v1.0, ssstrict v1.0, svrsw60t59b v1.0.
 
 * The assembler now supports generating SFrame Version 3 format.  This version
   supports .text > 2 GiB, support for marking outermost frames, support for
diff --git a/gas/testsuite/gas/riscv/march-help.l b/gas/testsuite/gas/riscv/march-help.l
index 0ce2f896735..fd5dd889d35 100644
--- a/gas/testsuite/gas/riscv/march-help.l
+++ b/gas/testsuite/gas/riscv/march-help.l
@@ -147,6 +147,7 @@ All available -march extensions for RISC-V:
 	svinval                                 1.0
 	svnapot                                 1.0
 	svpbmt                                  1.0
+	svrsw60t59b                             1.0
 	svvptc                                  1.0
 	ssqosid                                 1.0
 	ssnpm                                   1.0
-- 
2.43.0