[PATCH] aarch64: Relax check for RNG system registers

[Richard Sandiford <richard.sandiford@arm.com>]

FEAT_RNG is an optional Armv8.5-A extension, but it can be backported
to earlier architectures as well.  GAS previously made the RNG registers
conditional on having both armv8.5-a and +rng, but only +rng should be
required.

This seems to be the only feature that was handled like this.

Tested on aarch64-linux-gnu.  OK to install?

Richard


opcodes/
	* aarch64-opc.c (SR_RNG): Don't require V8_5.

gas/
	* testsuite/gas/aarch64/rng-1.s, testsuite/gas/aarch64/rng-1.d: New
	test.
---
 gas/testsuite/gas/aarch64/rng-1.d | 10 ++++++++++
 gas/testsuite/gas/aarch64/rng-1.s |  3 +++
 opcodes/aarch64-opc.c             |  2 +-
 3 files changed, 14 insertions(+), 1 deletion(-)
 create mode 100644 gas/testsuite/gas/aarch64/rng-1.d
 create mode 100644 gas/testsuite/gas/aarch64/rng-1.s

diff --git a/gas/testsuite/gas/aarch64/rng-1.d b/gas/testsuite/gas/aarch64/rng-1.d
new file mode 100644
index 00000000000..8c65cba1d04
--- /dev/null
+++ b/gas/testsuite/gas/aarch64/rng-1.d
@@ -0,0 +1,10 @@
+#source: rng-1.s
+#objdump: -dr
+
+.*:     file format .*
+
+Disassembly of section \.text:
+
+0+ <.*>:
+.*:	d53b2405 	mrs	x5, rndr
+.*:	d53b2426 	mrs	x6, rndrrs
diff --git a/gas/testsuite/gas/aarch64/rng-1.s b/gas/testsuite/gas/aarch64/rng-1.s
new file mode 100644
index 00000000000..3565897b291
--- /dev/null
+++ b/gas/testsuite/gas/aarch64/rng-1.s
@@ -0,0 +1,3 @@
+	.arch armv8.4-a+rng
+	mrs x5, rndr
+	mrs x6, rndrrs
diff --git a/opcodes/aarch64-opc.c b/opcodes/aarch64-opc.c
index 4774eba2e54..72cf81936c8 100644
--- a/opcodes/aarch64-opc.c
+++ b/opcodes/aarch64-opc.c
@@ -3974,7 +3974,6 @@ aarch64_print_operand (char *buf, size_t size, bfd_vma pc,
   SYSREG ((n), (e), (f) | F_ARCHEXT, \
 	  AARCH64_FEATURE_##fe1 | AARCH64_FEATURE_##fe2)
 
-#define SR_RNG(n,e,f)	 SR_FEAT2(n,e,f,RNG,V8_5)
 #define SR_V8_1_A(n,e,f) SR_FEAT2(n,e,f,V8_A,V8_1)
 #define SR_V8_4_A(n,e,f) SR_FEAT2(n,e,f,V8_A,V8_4)
 
@@ -3994,6 +3993,7 @@ aarch64_print_operand (char *buf, size_t size, bfd_vma pc,
 #define SR_LOR(n,e,f)	  SR_FEAT (n,e,f,LOR)
 #define SR_PAN(n,e,f)	  SR_FEAT (n,e,f,PAN)
 #define SR_RAS(n,e,f)	  SR_FEAT (n,e,f,RAS)
+#define SR_RNG(n,e,f)	  SR_FEAT (n,e,f,RNG)
 #define SR_SME(n,e,f)	  SR_FEAT (n,e,f,SME)
 #define SR_SSBS(n,e,f)	  SR_FEAT (n,e,f,SSBS)
 #define SR_SVE(n,e,f)	  SR_FEAT (n,e,f,SVE)
-- 
2.25.1