Re: [PATCH v2 04/21] arm64: bpf: Add support for generating reads of TPIDRRO_EL0

[Jinjie Ruan]

在 2026/9/19 0:13, Will Deacon 写道:
> In preparation for storing 'current' in TPIDRRO_EL0, add support for the
> instruction encoding of "MRS Rt, TPIDRRO_EL0" to the BPF JIT.
> 
> Cc: Mark Rutland <mark.rutland@xxxxxxx>
> Signed-off-by: Will Deacon <will@xxxxxxxxxx>
> ---
>  arch/arm64/include/asm/insn.h | 1 +
>  arch/arm64/net/bpf_jit.h      | 2 ++
>  2 files changed, 3 insertions(+)
> 
> diff --git a/arch/arm64/include/asm/insn.h b/arch/arm64/include/asm/insn.h
> index 1ce75a442638..0e739740513d 100644
> --- a/arch/arm64/include/asm/insn.h
> +++ b/arch/arm64/include/asm/insn.h
> @@ -136,6 +136,7 @@ enum aarch64_insn_special_register {
>  };
>  
>  enum aarch64_insn_system_register {
> +	AARCH64_INSN_SYSREG_TPIDRRO_EL0	= 0x5e83,


Reviewed-by: Jinjie Ruan <ruanjinjie@xxxxxxxxxx>

>  	AARCH64_INSN_SYSREG_TPIDR_EL1	= 0x4684,
>  	AARCH64_INSN_SYSREG_TPIDR_EL2	= 0x6682,
>  	AARCH64_INSN_SYSREG_SP_EL0	= 0x4208,
> diff --git a/arch/arm64/net/bpf_jit.h b/arch/arm64/net/bpf_jit.h
> index b2fe6e6dcf44..df469a005373 100644
> --- a/arch/arm64/net/bpf_jit.h
> +++ b/arch/arm64/net/bpf_jit.h
> @@ -331,6 +331,8 @@
>  	aarch64_insn_gen_adr(0, offset, Rd, AARCH64_INSN_ADR_TYPE_ADR)
>  
>  /* MRS */
> +#define A64_MRS_TPIDRRO_EL0(Rt) \
> +	aarch64_insn_gen_mrs(Rt, AARCH64_INSN_SYSREG_TPIDRRO_EL0)
>  #define A64_MRS_TPIDR_EL1(Rt) \
>  	aarch64_insn_gen_mrs(Rt, AARCH64_INSN_SYSREG_TPIDR_EL1)
>  #define A64_MRS_TPIDR_EL2(Rt) \

-- 
Best regards,
Jinjie