Ping: [PATCH] Arm64: support CLEARBHB alias

[Jan Beulich]

On 12.09.2022 10:40, Jan Beulich via Binutils wrote:
> While the Arm v8 ARM (rev I-a) still doesn't mention this alias, it is
> (typically via a macro) already in use in kernels and alike.

May I ask for feedback here? Without hearing back, I guess I'll simply
put this in some time next week.

Jan

> ---
> Diffs of generated files omitted.
> 
> --- a/gas/testsuite/gas/aarch64/system.d
> +++ b/gas/testsuite/gas/aarch64/system.d
> @@ -12,6 +12,7 @@ Disassembly of section \.text:
>  .*:	d503207f 	wfi
>  .*:	d503209f 	sev
>  .*:	d50320bf 	sevl
> +.*:	d50322df 	clearbhb
>  .*:	d503201f 	nop
>  .*:	d503203f 	yield
>  .*:	d503205f 	wfe
> @@ -34,7 +35,7 @@ Disassembly of section \.text:
>  .*:	d503227f 	hint	#0x13
>  .*:	d503229f 	(hint	#0x14|csdb)
>  .*:	d50322bf 	hint	#0x15
> -.*:	d50322df 	hint	#0x16
> +.*:	d50322df 	(hint	#0x16|clearbhb)
>  .*:	d50322ff 	hint	#0x17
>  .*:	d503231f 	(hint	#0x18|paciaz)
>  .*:	d503233f 	(hint	#0x19|paciasp)
> --- a/gas/testsuite/gas/aarch64/system.s
> +++ b/gas/testsuite/gas/aarch64/system.s
> @@ -11,6 +11,7 @@
>  	wfi
>  	sev
>  	sevl
> +	clearbhb
>  
>  	.macro	all_hints from=0, to=127
>  	hint \from
> --- a/opcodes/aarch64-tbl.h
> +++ b/opcodes/aarch64-tbl.h
> @@ -4034,6 +4034,7 @@ const struct aarch64_opcode aarch64_opco
>    CORE_INSN ("esb", 0xd503221f, 0xffffffff, ic_system, 0, OP0 (), {}, F_ALIAS),
>    CORE_INSN ("psb", 0xd503223f, 0xffffffff, ic_system, 0, OP1 (BARRIER_PSB), {}, F_ALIAS),
>    CORE_INSN ("tsb", 0xd503225f, 0xffffffff, ic_system, 0, OP1 (BARRIER_PSB), {}, F_ALIAS),
> +  CORE_INSN ("clearbhb", 0xd50322df, 0xffffffff, ic_system, 0, OP0 (), {}, F_ALIAS),
>    CORE_INSN ("clrex", 0xd503305f, 0xfffff0ff, ic_system, 0, OP1 (UIMM4), {}, F_OPD0_OPT | F_DEFAULT (0xF)),
>    CORE_INSN ("dsb", 0xd503309f, 0xfffff0ff, ic_system, 0, OP1 (BARRIER), {}, F_HAS_ALIAS),
>    V8_7_INSN ("dsb", 0xd503323f, 0xfffff3ff, ic_system, OP1 (BARRIER_DSB_NXS), {}, F_HAS_ALIAS),