[AArch64] Reject invalid immediate operands to MSR UAO

[Matthew Wahab]

Hello,

In the instruction to write to the ARMv8.2 PSTATE field UAO, MSR UAO,
#<imm>, the immediate should be either 0 or 1 but GAS accepts any
unsigned 4-bit integer.

This patch implements the constraint on the immediate, generating an
error if the immediate operand is invalid, and adds tests for the
illegal forms.

Tested aarch64-none-linux-gnu with cross-compiled check-binutils and
check-gas.

Ok for trunk?
Matthew

opcodes/
2016-01-14  Matthew Wahab  <matthew.wahab@arm.com>

	* aarch64-opc.c (operand_general_constraint_met_p): Check validity
	of MSR UAO immediate operand.

gas/
2015-01-14  Matthew Wahab  <matthew.wahab@arm.com>

	* testsuite/gas/aarch64/armv8_2-a-illegal.d: New.
	* testsuite/gas/aarch64/armv8_2-a-illegal.l: New.
	* testsuite/gas/aarch64/armv8_2-a-illegal.s: New.


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