RISC-V: GAS: Add basic shared test utilities

This commit adds basic shared test utilities intended for future
extension tests.

gas/ChangeLog:

	* testsuite/gas/riscv/testutils.inc: New test utilities.

gas/testsuite/gas/riscv/testutils.inc

@@ -0,0 +1,113 @@
+# Set NOARCH symbols.
+.ifndef	NOARCH
+.set	NOARCH, 0
+.endif
+.ifndef	NOARCH_ARCH
+.set	NOARCH_ARCH, 0
+.endif
+.ifndef	NOARCH_XLEN
+.set	NOARCH_XLEN, 0
+.endif
+.if	NOARCH
+.set	NOARCH_ARCH, 1
+.set	NOARCH_XLEN, 1
+.endif
+
+# Update XLEN constraint symbols.
+# For intentional error handling tests, .if SYM ... .endif block should be
+# used to test those varibales.
+.macro	UPDATE_XLEN
+	.if	NOARCH_XLEN
+		# When NOARCH_XLEN is set,
+		# set those variables to "invalid" 1 to generate errors.
+		.set	XLEN_EQ_32, 1
+		.set	XLEN_EQ_64, 1
+		.set	XLEN_GE_64, 1
+	.else
+		# Set symbol values depending on the XLEN.
+		.ifdef	XLEN
+			.ifeq	XLEN-32
+			.set	XLEN_EQ_32, 1
+			.else
+			.set	XLEN_EQ_32, 0
+			.endif
+			.ifeq	XLEN-64
+			.set	XLEN_EQ_64, 1
+			.else
+			.set	XLEN_EQ_64, 0
+			.endif
+			.ifge	XLEN-64
+			.set	XLEN_GE_64, 1
+			.else
+			.set	XLEN_GE_64, 0
+			.endif
+		.else
+			.set	XLEN_EQ_32, 0
+			.set	XLEN_EQ_64, 0
+			.set	XLEN_GE_64, 0
+		.endif
+	.endif
+.endm
+UPDATE_XLEN
+
+# Set the base architecture.
+.macro	SET_BASE_FORCE xlen, basearch=i
+	.option	arch, rv\xlen\basearch
+	.set	XLEN, \xlen
+	UPDATE_XLEN
+.endm
+
+# Set the base architecture unless the symbol NOARCH_ARCH is set.
+.macro	SET_BASE xlen, basearch=i
+	.if	!NOARCH_ARCH
+	SET_BASE_FORCE	\xlen, \basearch
+	.endif
+.endm
+
+# Begin base architecture block.
+.macro	SET_BASE_START_FORCE xlen, basearch=i
+	.option		push
+	SET_BASE_FORCE	\xlen, \basearch
+.endm
+
+# Begin base architecture block.
+# Don't change the architecture if NOARCH_ARCH is set.
+.macro	SET_BASE_START xlen, basearch=i
+	.option		push
+	SET_BASE	\xlen, \basearch
+.endm
+
+# End base architecture block.
+.macro	SET_BASE_END
+	.option	pop
+.endm
+
+# Set the architecture.
+.macro	SET_ARCH_FORCE arch
+	.option	arch, \arch
+.endm
+
+# Set the architecture unless the symbol NOARCH_ARCH is set.
+.macro	SET_ARCH arch
+	.ifeq	NOARCH_ARCH-0
+	SET_ARCH_FORCE	\arch
+	.endif
+.endm
+
+# Begin architecture block.
+.macro	SET_ARCH_START_FORCE arch
+	.option		push
+	SET_ARCH_FORCE	\arch
+.endm
+
+# Begin architecture block.
+# Don't change the architecture if NOARCH_ARCH is set.
+.macro	SET_ARCH_START arch
+	.option		push
+	SET_ARCH	\arch
+.endm
+
+# End architecture block.
+.macro	SET_ARCH_END
+	.option	pop
+.endm